Maximized Values of LNG Specifications in the LNG Industry: Producer and Buyer Perspectives

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1 Maximized Values of LNG Specifications in the LNG Industry: Producer and Buyer Perspectives Joseph H. Cho, Ph.D., P.E. Director of Houston Tech. Center Jaeyoung Yang, Ph.D. Senior Process Engineer D. Y. Kim, Ph.D. Process Engineer Hong-Chul Kim, P.E. Sr. Consultant of Process Engineering SK Engineering & Construction 7e AIChE Spring Meeting, April th Topical Conference on Gas Utilization Tampa, Florida, April 26-30, 2009 ABSTRACT In the past, the major LNG buyers in Far East Asian countries prefer to import LNG with high heating value and to meet this specific requirement of the consumer, LNG industry started producing high heating value LNG. However, there is a new trend with the potential buyers of LNG to have some flexibility in the ranges of natural gas properties they were able to choose from. As the growing demand increases for lean LNG (low calorific value), especially in the US and the UK, LNG producers are forced to address new gas quality issues. The challenge is to understand the requirements of the potential new markets and to plan a flexible way to meet the requirements of both the LNG exporters and importers. This paper discusses the flexibility and allowable ranges of LNG specifications which satisfies both producers as well as importers with reference to maximizing the LNG production flexibility and importers issues on interchangeability. These specifications are compared in detail to those of LNG being produced along with the options and problems for conditioning the natural gas on either end of the LNG.

2 INTRODUCTION Producing LNG from the natural gas is a simple phase change process without any chemical reactions involved. However, LNG production plant is composed of many other facilities whose purpose is to either protect equipment and/ or to meet the LNG product specifications. For instance, heavy hydrocarbon removal, dehydration, and mercury removal processes could be the first purpose oriented processes, while NGL extraction processes could be the second purpose oriented processes. When it comes to acid gas removal process, it is built for both purposes. Although in general terms, all the LNG production facilities look alike, but on a closer look, every LNG production plant is unique in its nature and characteristic. The facility would be only designed to cater the needs of its captive consumers. It is interesting to note that unlike other industries, traditionally, the conception of a LNG project used to start by completing the LNG chain; abundant natural gas supply, and a consumer with specific quality and quantity requirements of LNG which is compatible with the natural gas resources. Usually long term Sales and Purchase Agreement (SPA), take or pay type of contracts used to support and justify the construction of LNG project. However, this traditional LNG industry is now facing a challenge to supplement new gas demand and meet the gas quality at the same time. WORLDWIDE LNG PRODUCDER AND LNG QUALITY LNG is produced worldwide in about 20 LNG production facilities. Depending on the geographical region, LNG products have different qualities which are basically attributed to the raw natural gas composition. In order to operate the plant in a safe manner and to maintain LNG quality, there are several processing steps involved such as Acid gas removal, dehydration, and heavy hydrocarbon removal. In Acid gas removal section, poisonous and corrosive gases such as H2S and CO2 are removed to the maximum extent. In a separate unit, heavy hydrocarbons and aromatics are removed prior to cryogenic process to prevent freezing in the main cryogenic heat exchanger. The other components including nitrogen, methane, ethane, propane and heavier hydrocarbon are major constituents of LNG and their composition is very important since their composition determine the LNG product markets in which the LNG products are marketable. Therefore, LNG producers should consider over the LNG product quality, as well as

3 natural gas feed quality, which will be produced in their LNG production plant. In a table 1, LNG product composition and quality is listed for the representative LNG products worldwide [1]. Table 1: Typical LNG composition and calorific value Alaska Brunei Malay sia Indon esia Austra lia Oman LNG A Qatar Composition,mol% Methane Ethane Propane Butane Pentane Nitrogen HHV, MJ/scm Wobbe Index LNG MARKET AND GAS SPECIFICATION LNG Market It is considered that Asia, Europe, and US are some of the major LNG markets worldwide. Traditionally, Asia is the largest market for LNG producers. Asian countries import rich LNG which contains much ethane and heavier hydrocarbons. On the other hand, the US and UK import lean LNG which contains less ethane and heavier hydrocarbons. This is due to their pipeline gas specifications that LNG importer should meet.

4 Before LNG consumption is increased, the US and most European countries depend on their natural gas supply through compressed pipeline natural gas. However, worldwide energy deficiency has forced the countries to import LNG more than ever. However, as their original pipeline network requires lean natural gas, conventional rich LNG product does not comply with their pipeline gas specification. Under this market environment, the new emerging lean LNG product markets are very attractive to LNG producers since their energy consumption is remarkable. In addition to the new lean natural gas market, spot market became a new market trend which deals short term base or cargo based contracts. This market is believed to be very crucial in the near future because LNG demand is seasonal and variable, although LNG production rate cannot be responded easily to variable market demands. Pipeline Gas Specifications Among many other gas specifications, calorific value is believed to be one of the most important specifications. Calorific value is generally expressed by high heating value (HHV) or by Wobbe index. Worldwide HHV allowable range in the market is shown in figure 1. Many LNG producers are producing rich LNG for their existing markets and are not in a position to change their product to cater the ever increasing demand for lean LNG. However, calorific value specification is not only the driver for marketability. The other components such as ethane, butane and oxygen and CO 2 specifications are not uniform around the global market. For example CO 2 content limit is 2~3% in Europe. In California, ethane and CO 2 content are limited at 6% and 3% respectively. Maximum butane content is 2% and inert should be less than 4% in the US. For Oxygen, Europe allows only 0.01%, while Canada and California allows 0.4% and 0.2%, respectively. Australia LNG can not be marketable in US and UK because its HHV is too high to be allowed in their pipeline, while it is marketable in Asian counties and continental Europe. For an another example, LNG A in table 1 could be distributed in the US market in view of its calorific value but not in California due to its component based specification which need less than 6 % ethane content. As a result, it is clear that LNG product has a very limited and specific marketable area and do not enjoy a global market like other hydrocarbons. Due to this inevitable linkage between LNG product quality and LNG market, the LNG producer can not have flexibility in marketing.

5 HHV [MJ/cm] Brunei Malaysia Indonesia Oman Qatar Alaska Australia 34 USA United Kingdom Canada Japan Korea Europe Fig. 1 - Worldwide HHV Specifications GAS INTERCHANGEABILITY In the LNG industry, expanding gas demand and emerging new markets are opportunities for both LNG producers and LNG importers. Since LNG produced is not compatible with every existing pipeline gas specification worldwide, LNG importers do not have many choices in selecting LNG on the market since natural gas source is inevitably restricted to some specific LNG producers. In order to get some bargaining power in the LNG market, and to meet the increasing gas demand, LNG importers need to buy any LNG and should be in a position to adjust its specification to meet the local pipeline specification. Therefore, the issue of interchangeability dealt with quality specification and its suitability for end user including appliances, gas turbines, process applications and vehicular fuels [2]. Therefore it refers to a measure degree to which the combustion characteristics of vaporized LNG are compatible with those of conventional pipeline gas [3]. It is a new imminent challenge for LNG importers to adjust the imported LNG to be interchangeable with existing pipeline specification. At the same time, from the LNG production side, LNG producers need to have some facilities to adjust their produced

6 LNG quality in accordance with LNG market demand. CALORIFIC VALUE CONTROL TECHNOLOGY Since calorific valve is important specification, new technologies for adjusting calorific value have been developed to pursue the new market trend. These available technologies help LNG importers decision making for any imported LNG interchangeability projects. The calorific value control technologies are classified into two groups: decreasing calorific value and increasing calorific value. Decreasing calorific value: N 2 /CO 2 /Air/Fuel gas injection, NGL extraction Increasing calorific value: LPG injection, N 2 /CH 4 rejection In addition to these technologies, dual calorific value production system has been developed to produce lean gas and rich gas without blending LPG and injecting inert [4]. The calorific value control technologies and their basic characteristics are described briefly below. Technology for decreasing calorific value Inert Injecting Process Membrane process, pressure swing adsorption (PSA) or cryogenic air separation process are utilized to produce N 2 for injection, depending on the required production capacity. It is generally believed that cryogenic air separation process is more economical than membrane process for high capacity plant. For air injection, it only needs to compress air to pipeline pressure, but accompanying O 2 with air might not be acceptable for most pipeline networks. Flue gas injection is another very attractive option as it is considered less cost, but inherently more difficult to accept because of water vapor and excess O 2. The two representative calorific value indices (HHV and Wobbe Index) show different sensitivity on calorific value control technologies. As the degree of N 2 /CO 2 injection increases, both HHV and Wobbe index decrease, but with different amount. As Wobbe index has specific density in the denominator, the molecular weight of the injection component is another factor which influences the Wobbe index as well as the amount of injection. Wobbe index is more sensitive to the amount of N 2 /CO 2 injected. In fact, the variation of HHV is irrelevant to the material injected if they have no heating value as shown in Fig. 2. HHV is dependent only on the amount of inert material.

7 However, as can be seen in Figure 2, Wobbe index is more sensitive on the injection amount when CO 2 is injected rather than when N 2 is injected because CO 2 has higher relative density than N 2. If Wobbe index is crucial to meet specification and needs to be reduced more than HHV, CO 2 injection is more efficient method of calorific value control in technical point of view without considering environmental issue of emitting more CO 2. However, when inert injection is considered to decrease HHV, it needs to be checked out if inert composition violates pipeline specification of inert maximum content. When air is injected instead of nitrogen or carbon dioxide, O 2 in air is a controlling factor. If O 2 content is limited to maximum 0.2% as in California, air should be injected so as not to violate the maximum limit. With this low O 2 limit, HHV can not be regulated much by injecting air, even though this method is cost effective compared to N 2 injection. HHV [MJ/cm] Wobbe Index [MJ/cm N2 Injection to 4% CO2 Injection to 4% NGL Extraction to 90% 45.0 Fig. 2 - The Effect of Inert Injection on Calorific Value NGL Extraction Process NGL extraction is most effective and easily applicable method to control the calorific value of LNG product in LNG production plants. Up to now, it is believed that it is economically attractive or worth of capital expenditure when the NGL extracted is marketable without high transport cost. If NGL extraction is done only for calorific value control, the facility does not need to have distillation columns as many as multi-products LNG production plant has, in which pure ethane, propane, butane and C 5 + are produced

8 simultaneously. In general, by modulating ethane recovery into methane-rich main stream, LNG product calorific value can be controlled. Although NGL extraction is used for calorific value control in LNG terminals, NGL extraction is more common concept in the liquefaction plants to reduce heavy component which might cause freezing problem in cryogenic heat exchangers. For the purpose of preventing freezing, a simple scrubber can be utilized to remove heavy hydrocarbons, but it is not efficient to lower the calorific value as there are not freezing-inducing components in natural gas as much to lower the calorific value. For the purpose of calorific value control, a hydrocarbon extraction facility is installed with a series of distillation columns including a deethanizer as well as a demethanizer with cold reflux. NGL extraction processes are well investigated in some paper and patent [5, 6, 7, and 8]. A method commonly employed in a gas processing plant and liquefaction plant is expander-compressor combination with some heat recovery heat exchangers. Ethane content in the extracted NGL varies depending on the operating condition of demethanizer, especially on how much reflux rate is supplied to the column. As the demethanizer should run below the critical pressure at low temperature to make separation possible, the feed gas should be let down to a lower pressure by expander or J-T valve as well as to get some liquid traffic in a demethanizer (Fig. 3) Contrary to the NGL extraction process in the baseload LNG plant, some heat exchangers are necessary to heat up and vaporize LNG partially to accomplish separation in a distillation column for the LNG terminal NGL extraction facility. The general NGL extraction process from LNG is illustrated in figure 4. In general, LNG is pumped to a distillation column operation pressure. A cold LNG feed stream can be used for cooling medium to supply reflux stream to the top of the column, while some heat exchangers are used to provide energy into the column using a feed gas heater, a side reboiler, and a bottom reboiler.

9 Fig. 3 - NGL Extraction Process in a Liquefaction Plant (Expander-compressor process) Fig. 4 - NGL Extraction Process in a LNG Terminal

10 Technology for Increasing Calorific Value As inert injection can decrease calorific value, removing inert is a way to increase calorific value. However, calorific value control by rejecting nitrogen is not easy as nitrogen injection, since the effect of nitrogen rejection on the calorific value is prominent only when raw natural gas stream contains high nitrogen content. On top of that, N2 rejection should be performed in accordance with fuel balance of the LNG plant and requires another cryogenic distillation column to reduce the content enough to achieve satisfactory decrease of the calorific value. LPG injection is another way to increase calorific value of natural gas, although it is costly and damages the image of LNG which is known to be a clean energy [4]. HHV increases, in general, about 1.8% with 1% increase of LPG fraction by injecting LPG. Where high HHV is required as in Japan and Korea, LPG injection is a simple and effective way to enhance calorific value of imported lean LNG. ECONOMIC EVALUATION OF CALORIFIC VALUE CONTROL TECHNOLOGY Economic evaluation for the two representative calorific value control technologies has been performed. This analysis was based on 750 mmcfd send-out capacity and 15 years life cycle. Discount rate was assumed as 10%, while power cost is 5 cents/kwh. As a result, NGL extraction facility needs large capital cost comparing to the N2 injection facilities. However, the facility can produce hydrocarbon products such as ethane, propane, butane, etc, while there is shrinkage of natural gas send-out rate due to rejection of the hydrocarbons. The net operation profit is remarkable which makes the facility attractive in spite of large capital cost. However, N 2 injection does not create any economic value unless the rich LNG is less expansive than lean LNG so that net profit is produced from the purchasing cost. Relative Costs NGL Extraction N2 Injection CAPEX 100% 15 20% OPEX 100% % Net Operating Profit 100% - NPV 100% -100% Unit: Thousand USD

11 TAILORING LNG PRODUCTION AND DISTRIBUTION It is certain that LNG producers can get better position in LNG market, if they have facilities that can control calorific value of their products. It would be more appropriate if their facility can control individual component content along with calorific value. If LNG storage facilities allow not-less-than two calorific value LNG products, LNG producer can produce two different LNG products for different markets. The production schedule is optimized, that is, the production quantity for each product is optimized, depending on the market situation. If it is more profitable to sell their product in lean LNG market, they can increase lean LNG production rate by operating NGL extraction facility. The emerging of LNG spot market is their new opportunity to get more profit from their LNG production plant since they can optimize their production schedule as per spot market demand. Theoretically, LNG producer portfolio should be variable and optimized on the product rate for lean and rich LNG. An LNG producer can produce a long-term base LNG product, while allowing remaining LNG production capacity to be flexible to make maximum profit by optimizing production schedule/rate. Asian countries need more natural gas in winter season for residential heating and they need to import more LNG from market. In case the Asian country can not acquire rich LNG as much as they require from their conventional supplier, they usually import lean LNG and inject LPG to meet the pipeline calorific value requirements. Figure 5 shows the example where Alaska LNG with low HHV which is marketable only in the lean gas market and Europe is imported to Asian countries and the LNG can meet the pipeline specification by injecting LPG. On the other hand, LNG producer s tailoring to market demand can be illustrated as in figure 6. As an example, Angola natural gas after treatment has a very high HHV of 44.5 MJ/cm. If the natural gas is liquefied into LNG, it can be marketable only in continental Europe. However, LNG importers in Asian countries who have N2 injection facility can import the LNG and turn it into pipeline compatible gas. As an another method of HHV control, LNG producer with NGL extraction facility can decrease HHV to 38.2 MJ/cm, by running NGL extraction process shown in Fig. 3, which is marketable in lean LNG gas markets of the UK, Canada, and UK. NGL extraction at LNG terminal using a process shown in Fig. 4 can also reduce the HHV which is also marketable in the lean gas markets mentioned above.

12 As shown in Fig. 7, LNG which is exported to continental Europe depends highly on gas demands of Europe. Since Europe has very wide range of HHV specification, European countries can import most of LNG produced worldwide. If European countries are more interested in buying other LNG with lower HHV, the high HHV LNG falls into very unfortunate situation, by loosing market. This situation can overcome by using calorific value control facilities which make the LNG marketable to Asian countries, US, UK, etc HHV [MJ/cm] % LPG Injection USA United Kingdom Canada Japan Korea Europe Fig. 5 - Meeting Calorific Value by Increasing HHV

13 N 2 Injection to max. 4% NGL LNG Plant (C 2 Recovery = 0.7) HHV [MJ/cm] NGL terminal (C 2 Recovery = 0.4) USA United Kingdom Canada Japan Korea Europe Fig. 6 - Extending a Market by Decreasing HHV Conventional M arket N ew m arket b y H H V co n tro l Fig. 7 - Diversification of LNG Market by Calorific Value Control

14 CONCLUSION Current LNG market is faced with new challenges as well as opportunities due to increasing demand for natural gas. LNG producers and LNG importers are responding to new market environment by employing several calorific value adjustment technologies. It is no doubt that NGL extraction facility in LNG production plants as well as LNG terminals is a reliable and efficient method to reduce HHV. Inert injection and LPG injection in a LNG terminal can also control the calorific value. But, they have some component base limitations such as maximum inert and/or butane content. By selecting appropriate method for calorific value control, the calorific value control facility provides LNG importers and LNG producers with more flexible and economical advantage in a LNG market. By installing calorific value control facility, natural gas can have wide range of HHVs, allowing LNG producers to enter new markets and LNG importers to import less expansive LNG. The facility makes them have more bargaining power in LNG market and maintain stable send-out rate to pipelines.

15 REFERENCE 1. D. McCartmey, Gas Conditioning for Imported LNG, 82 nd Annual convention, Gas Processors Association, D.J. Hawkins, Uncertainty about gas quality could delay US LNG imports, Sept. 20, 2004, Oil & Gas Journal. 3. D.R. Rogers, Gas Interchangeability and Its Effects On U.S. Imports Plans, August 2003, Pipeline & Gas Journal. 4. J Cho, S.N. Shah, J.T. Kwan, and G-H. Lim, Development of a practical process for a natural gas calorific value adjustment system without blending rich gas. 5. J. Cho, Cost Effective and Practical NGL Stripping Processes, April 2008, AIChE Meeting 6. D. Coyle, F. Vega, and C. Durr, Natural gas specification challenges in the LNG industry, LNG 15, J. Cho, H. Kotzot, F. Vega, and C Durr, Cost Effective Processes for Heating Value adjustment, GasTech J.D. Wilkinson and H.M. Hudson, Liquefied Natural Gas Processing, US Patent B2 9. S. Huang, H. Kotzot, F. Vega, and C. Durr, Selecting the optimal scheme for N2 injection in an LNG terminal. 84 th Annual convention, Gas Processors Association, 2005

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