Skid-mounted natural gas dehydration and demercuration module

Abstract

The invention discloses a skid-mounted natural gas dehydration and demercuration module. Comprising a natural gas filter separator, a natural gas gas-water separator, three molecular sieve adsorption towers, a regenerated gas heater, a regenerated gas cooler, a regenerated gas-water separator, a mercury removal bed, a mercury removal filter, a fuel gas tank, a main gas supply pipe, three branch gas inlet pipes, three branch gas outlet pipes, a first pressure reducing valve, a gas inlet switch valve, a gas outlet switch valve and a regenerated gas inlet pipe. According to the skid-mounted natural gas dehydration and demercuration module, a process system is optimized, the process system is simplified, the energy consumption of a device is reduced, the adaptability of the process system is improved, energy is saved, and the equipment and operation cost is reduced; the process skid is reasonably arranged, the device is highly integrated, the space of the skid is saved, operation, transportation and installation are convenient, and the equipment cost is saved.

Description

Technical Field

[0001] The invention relates to the field of natural gas liquefaction equipment, and in particular to a natural gas dehydration and mercury removal module before natural gas liquefaction. Background Art

[0002] The natural gas liquefaction device includes: a natural gas dehydration and demercuration module, a natural gas deacidification module, and a natural gas refrigeration module; the natural gas dehydration and demercuration module is used to filter, meter, dehydrate, and demercurate the raw gas. The raw gas is natural gas containing impurities. The natural gas deacidification module is used to remove acid gases such as CO2 and H2S from the raw gas. The natural gas refrigeration module is used to refrigerate the natural gas and liquefy the natural gas purified at room temperature into liquefied natural gas. The traditional natural gas dehydration and demercuration module has a complex process system, poor adaptability, high energy consumption, high operating cost, and redundant design, which makes the system manufacturing cost high, the number of equipment is large, and it cannot be well compacted and reasonably arranged. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a skid-mounted natural gas dehydration and mercury removal module with optimized process, low energy consumption, high adaptability and reduced equipment cost.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a skid-mounted natural gas dehydration and demercuration module, comprising: a natural gas filter separator, a natural gas gas-water separator, a molecular sieve adsorption tower, a regeneration gas heater, a regeneration gas cooler, a regeneration gas-water separator, a demercuration bed, a demercuration filter, and a fuel gas tank, characterized in that: three molecular sieve adsorption towers are provided, the inlet of the natural gas filter separator is used to be connected to the raw gas delivery pipe, the outlet of the natural gas filter separator is connected to the natural gas inlet of the natural gas deacidification module through a pipeline, the natural gas outlet of the natural gas deacidification module is connected to the natural gas inlet of the natural gas gas-water separator through a pipeline, the natural gas outlet of the natural gas gas-water separator is connected to the inlet of the main air supply pipe, the outlet of the main air supply pipe is respectively connected to the inlet of three branch air intake pipes, the outlets of the three branch air intake pipes are respectively connected to the top inlet of three molecular sieve adsorption towers, the bottom outlets of the three molecular sieve adsorption towers are respectively connected to the inlet of the demercuration bed through a branch air pipe, the outlet of the demercuration bed is connected to the inlet of the demercuration filter through a pipeline, the main air supply pipe is connected in series with a first pressure reducing valve, and the three branch air intake pipes are respectively connected in series with an inlet valve. The regeneration gas inlet pipe is connected to the main air supply pipe at one end, and the connecting point is located in front of the first pressure reducing valve. The other end of the regeneration gas inlet pipe is connected to the three branch air inlet pipes through pipes with switch valves, and each connecting point is located behind the corresponding air inlet switch valve. The inlet of the regeneration gas cooler is connected to the three branch air inlet pipes through pipes with switch valves, and each connecting point is located behind the corresponding air inlet switch valve. The outlet of the regeneration gas cooler is connected to the inlet of the regeneration gas-water separator through a pipe. The two gas ports are connected, the gas outlet one of the regeneration gas-water separator is connected to the inlet of the fuel gas tank through a pipeline with a second pressure reducing valve, the gas outlet two of the regeneration gas-water separator is connected to the main air supply pipe through a return pipeline, and the connecting point is located behind the first pressure reducing valve, the inlet of the regeneration gas heater is connected to the three outgoing gas pipes through pipelines with switch valves, and each connecting point is respectively located in front of the corresponding gas outlet switch valve, the outlet of the regeneration gas heater is connected to the three outgoing gas pipes through pipelines with switch valves, and each connecting point is respectively located in front of the corresponding gas outlet switch valve.

[0005] Furthermore, in the aforementioned skid-mounted natural gas dehydration and mercury removal module, the liquid phase recovery port of the natural gas gas-water separator is connected to the natural gas deacidification module through a first recovery pipeline.

[0006] Furthermore, in the aforementioned skid-mounted natural gas dehydration and mercury removal module, the liquid phase recovery port of the regenerated gas-water separator is connected to the natural gas deacidification module through a second recovery pipeline.

[0007] Furthermore, in the aforementioned skid-mounted natural gas dehydration and demercuration module, the inlet of the natural gas filter separator is also connected to the commissioning recovery pipeline, the main gas supply pipe is also connected to the deacidification unqualified recovery pipeline, and the outlet of the demercuration filter is also connected to the dehydration unqualified recovery pipeline.

[0008] Furthermore, the aforementioned skid-mounted natural gas dehydration and mercury removal module, wherein: an instrumentation and control system junction box, an electrical system junction box, an online analysis cabinet are also provided, and the instrumentation and control system junction box, the electrical system junction box, the online analysis cabinet, a natural gas filter separator, a natural gas gas-water separator, a molecular sieve adsorption tower, a regeneration gas heater, a regeneration gas cooler, a regeneration gas-water separator, a mercury removal bed, a mercury removal filter, and a fuel gas tank are integrated on a skid.

[0009] Furthermore, the aforementioned skid-mounted natural gas dehydration and mercury removal module, wherein: the skid is a rectangular two-layer steel structure frame, the natural gas filter separator and its inlet valve group are arranged at the front of the skid, and are arranged side by side on the left and right, three molecular sieve adsorption towers and their inlet and outlet valve groups are arranged on one side of the skid behind the natural gas filter separator, and are arranged at intervals from front to back, wherein the top inlet valve group of the molecular sieve adsorption tower is located on the second-layer steel structure platform of the skid, the bottom outlet valve group of the molecular sieve adsorption tower is located on the first-layer steel structure base of the skid, the regenerated gas-water separator, The fuel gas tank, demercuration bed, demercuration filter and regeneration gas heater are arranged on one side of the skid behind the inlet valve group of the natural gas filter separator, and are arranged in sequence from front to back. The natural gas gas-water separator is arranged at the tail of the skid and behind the molecular sieve adsorption tower. The natural gas gas-water separator and the regeneration gas heater are arranged side by side. A stand is provided on the second-floor steel structure platform of the skid above the regeneration gas-water separator. The regeneration gas cooler is installed on the top of the stand. The instrumentation and control system junction box, electrical system junction box and online analysis cabinet are arranged on the side of the skid.

[0010] Furthermore, in the aforementioned skid-mounted natural gas dehydration and mercury removal module, the operating manholes of the natural gas filter separator, the molecular sieve adsorption tower, the regeneration gas-water separator, and the mercury removal bed are all facing outward, which is convenient for equipment loading, packing removal and internal inspection of the equipment; the side of the regeneration gas heater core extraction faces outward, which is convenient for core extraction inspection and maintenance of the regeneration gas heater.

[0011] The advantages of the present invention are as follows: the skid-mounted natural gas dehydration and mercury removal module optimizes the process system, simplifies the process system, reduces the energy consumption of the device, increases the adaptability of the process system, saves energy, reduces equipment and operating costs, and can remove the water content in natural gas to below 1ppm and the mercury content to 0.01μg / Nm 3 The following meets the requirements of natural gas liquefaction and the regulatory requirements of LNG commercial gas; the process skids are reasonably laid out, the device is highly integrated, the skid space is saved, the operation is convenient, and it is easy to transport and install, saving equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the process flow of the skid-mounted natural gas dehydration and mercury removal module of the present invention.

[0013] Figure 2 It is a schematic diagram of the three-dimensional structure of the skid-mounted natural gas dehydration and demercuration module of the present invention. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with specific embodiments and drawings.

[0015] like Figure 1 , Figure 2As shown, the skid-mounted natural gas dehydration and mercury removal module comprises: a natural gas filter separator 1, a natural gas gas-water separator 3, a molecular sieve adsorption tower, a regeneration gas heater 7, a regeneration gas cooler 8, a regeneration gas-water separator 9, a mercury removal bed 11, a mercury removal filter 12, and a fuel gas tank 10. There are three molecular sieve adsorption towers, namely a first molecular sieve adsorption tower 4, a second molecular sieve adsorption tower 5, and a third molecular sieve adsorption tower 6. When one molecular sieve adsorption tower is in adsorption and dehydration, another molecular sieve adsorption tower is in heating and regeneration, and another molecular sieve adsorption tower is in purging and cooling. The process states of the three molecular sieve adsorption towers are switched to each other through valves. The inlet of the natural gas filter separator 1 is used to communicate with the raw material. The gas transmission pipe is connected to the natural gas filter separator 1, the outlet of the natural gas filter separator 1 is connected to the natural gas inlet of the natural gas deacidification module 2 through a pipeline, the natural gas outlet of the natural gas deacidification module 2 is connected to the natural gas inlet of the natural gas gas-water separator 3 through a pipeline, the natural gas outlet of the natural gas gas-water separator 3 is connected to the inlet of the main gas supply pipe 25, the outlet of the main gas supply pipe 25 is respectively connected to the inlet of three branch air inlet pipes 26, the outlets of the three branch air inlet pipes 26 are respectively connected to the top inlet of three molecular sieve adsorption towers, the bottom outlets of the three molecular sieve adsorption towers are respectively connected to the inlet of the demercuration bed 11 through an outgoing air pipe 27, and the outlet of the demercuration bed 11 is connected to the inlet of the demercuration filter 12 through a pipeline. A first pressure reducing valve 13 is connected in series to the main air supply pipe 25, an air intake switch valve 28 is connected in series to the three branch air intake pipes 26, and an air outlet switch valve 29 is connected in series to the three outlet air pipes 27. One end of the regeneration air inlet pipe 24 is connected to the main air supply pipe 25, and the connecting point is located in front of the first pressure reducing valve 13. The other end of the regeneration air inlet pipe 24 is connected to the three branch air intake pipes 26 through pipes with switch valves, and each connecting point is located behind the corresponding air intake switch valve 28. The inlet of the regeneration air cooler 8 is connected to the three branch air intake pipes 26 through pipes with switch valves, and each connecting point is located behind the corresponding air intake switch valve 28. The outlet of 8 is connected to the air inlet of the regeneration gas-water separator 9 through a pipeline, the air outlet one of the regeneration gas-water separator 9 is connected to the inlet of the fuel gas tank 10 through a pipeline with a second pressure reducing valve 14, the air outlet two of the regeneration gas-water separator 9 is connected to the main air supply pipe 25 through a return pipeline 17, and the connecting point is located behind the first pressure reducing valve 13, the inlet of the regeneration gas heater 7 is connected to the three outlet air pipes 27 through pipelines with switch valves, and each connecting point is located in front of the corresponding outlet switch valve 29, and the outlet of the regeneration gas heater 7 is connected to the three outlet air pipes 27 through pipelines with switch valves, and each connecting point is located in front of the corresponding outlet switch valve 29.

[0016] Only one natural gas filter separator 1 is provided for the intake gas, and by increasing the diameter and height of the equipment, the requirements of buffering the intake natural gas, separating gas from liquid and filtering solid impurities can be met at the same time.

[0017] Three molecular sieve adsorption towers are set up, one molecular sieve adsorption tower is used to adsorb and dehydrate the natural gas after decompression, and the other uses the natural gas before decompression to perform one tower cold blowing and one tower hot blowing in sequence. Because the regeneration gas pressure is high, the regeneration gas can be returned to the main air supply pipe 25 through the return pipe 17, avoiding the regeneration gas from being refluxed by pressurization, reducing costs and energy consumption. At the same time, the heat carried by the cold blowing of the regeneration gas in one tower is used for the hot blowing of another tower, saving the energy consumption of the regeneration gas heater 7.

[0018] The regenerated gas-water separator 9 is provided with two gas outlets, one for reflux through the return pipe 17, and the other for entering the fuel gas tank 10 after being decompressed through the second pressure reducing valve 14. The second pressure reducing valve 14 can flexibly adjust the amount of fuel gas according to the demand for fuel gas, and the remaining regenerated gas can be refluxed for the molecular sieve adsorption tower, and the process system has strong adaptability.

[0019] During operation, the raw gas will enter the natural gas filter separator 1 through the raw gas delivery pipe for buffering, gas-liquid separation and filtering of large particle impurities, and then the raw gas will enter the natural gas deacidification module 2 for deacidification. A flow meter for detecting the flow of raw natural gas is provided on the pipeline between the natural gas filter separator 1 and the natural gas deacidification module 2. Then the raw gas will enter the natural gas gas-water separator 3 to separate most of the water. In this embodiment, the air inlet switch valve 28 and the air outlet switch valve 29 on the pipeline where the second molecular sieve adsorption tower 5 and the third molecular sieve adsorption tower 6 are located are temporarily closed, and a small part of the natural gas coming out of the natural gas gas-water separator 3 is controlled by the valve to become the regenerated gas and flow along Figure 1 The red arrow line in the middle enters the third molecular sieve adsorption tower 6 to purge and cool the molecular sieve in the tower, and then the gas enters the regeneration gas heater 7 for heating. The heated regeneration gas flows along Figure 1 The blue arrow line in the middle enters the second molecular sieve adsorption tower 5 to heat and regenerate the molecular sieve in the tower to dry the molecular sieve and restore its adsorption capacity, and then regenerates the gas to enter the regeneration gas cooler 8 for cooling, and then enters the regeneration gas-water separator 9 for gas-liquid separation. The regeneration gas after gas-liquid separation can be decompressed by the second pressure reducing valve 14 and then enter the fuel gas tank 10 for storage, or it can be returned to the main gas supply pipe 25 through the return pipe 17 for reuse; the other natural gas coming out of the natural gas-water separator 3 is controlled by the valve to be decompressed by the first pressure reducing valve 13 and then along the Figure 1 The green arrow line in the middle enters the first molecular sieve adsorption tower 4 for adsorption dehydration. The raw gas dehydrated by the first molecular sieve adsorption tower 4 enters the mercury removal bed 11 for mercury removal. Then the raw gas enters the mercury removal filter 12 to filter impurities, thereby obtaining purified natural gas.

[0020] In this embodiment, the liquid phase recovery port of the natural gas gas-water separator 3 is connected to the natural gas deacidification module 2 through the first recovery pipeline 15. The liquid phase recovery port of the regeneration gas-water separator 9 is connected to the natural gas deacidification module 2 through the second recovery pipeline 16. After such an arrangement, the liquid phase separated from the natural gas is returned to the natural gas deacidification module 2 through the recovery pipeline, which not only prevents the liquid phase from entering the sewage system, thereby reducing the cost of sewage storage, transportation and treatment, but also reduces the water replenishment amount of the natural gas deacidification module 2 through water recovery, saving water resources.

[0021] The inlet of the natural gas filter separator 1 is also connected to the commissioning recovery pipeline 18, the main gas delivery pipe 25 is also connected to the deacidification unqualified recovery pipeline 19, and the outlet of the demercuration filter 12 is also connected to the dehydration unqualified recovery pipeline 20. After such an arrangement, during the commissioning period, unqualified natural gas can be recycled and reused, avoiding waste of natural gas and saving costs.

[0022] In this embodiment, an instrumentation and control system junction box 21, an electrical system junction box 22, and an online analysis cabinet 23 are also provided. The instrumentation and control system junction box 21, the electrical system junction box 22, the online analysis cabinet 23, the natural gas filter separator 1, the natural gas gas-water separator 3, the molecular sieve adsorption tower, the regeneration gas heater 7, the regeneration gas cooler 8, the regeneration gas-water separator 9, the mercury removal bed 11, the mercury removal filter 12, and the fuel gas tank 10 are integrated on a skid.

[0023] Online sampling interfaces are respectively provided at the rear end of the natural gas filter separator 1 and the front and rear ends of the molecular sieve adsorption tower, and the sampling interfaces are connected to the online analysis cabinet 23. The online analysis cabinet 23 can monitor the acid gas content of the gas source, the acid gas content after the natural gas deacidification module 2, and the water content after the molecular sieve adsorption tower 4. The gas source situation can be analyzed in real time, and whether the deacidification and dehydration systems meet the product requirements.

[0024] The skid is a rectangular two-layer steel structure frame. The natural gas filter separator 1 and its inlet valve group are arranged at the front of the skid and arranged side by side. The three molecular sieve adsorption towers and their inlet and outlet valve groups are arranged on one side of the skid behind the natural gas filter separator 1 and arranged in intervals from front to back. The top inlet valve group of the molecular sieve adsorption tower is located on the second-layer steel structure platform of the skid, and the bottom outlet valve group of the molecular sieve adsorption tower is located on the first-layer steel structure base of the skid. The equipment pipelines are tightly arranged for easy operation and maintenance. The regenerated gas-water separator 9, the fuel gas tank 10, the demercuration bed 11, and the demercuration filter 1 2. The regeneration gas heater 7 is arranged on one side of the skid behind the inlet valve group of the natural gas filter separator 1, and is arranged in sequence from front to back. The natural gas gas-water separator 3 is arranged at the tail of the skid and behind the molecular sieve adsorption tower. The natural gas gas-water separator 3 and the regeneration gas heater 7 are arranged side by side. A stand is provided on the second-layer steel structure platform of the skid above the regeneration gas-water separator 9. The regeneration gas cooler 8 is installed on the top of the stand. The instrumentation system junction box 21, the electrical system junction box 22, and the online analysis cabinet 23 are arranged on the side of the skid to facilitate operation, inspection and maintenance.

[0025] The operating manholes of the natural gas filter separator 1, the molecular sieve adsorption tower, the regeneration gas-water separator 9, and the mercury removal bed 11 are all facing outward, which is convenient for equipment filling, packing removal and internal inspection of the equipment; the core extraction side of the regeneration gas heater 7 faces outward, which is convenient for core extraction inspection and maintenance of the regeneration gas heater 7.

[0026] The equipment in the skid is arranged according to the process route and compactly arranged to meet the process requirements. The length of the process pipeline is reduced, while saving skid space, so that the skid can be more miniaturized, which not only saves costs but also facilitates transportation.

[0027] The process pipelines are arranged in two layers, upper and lower, to make full use of the space inside the skid and ensure that the skid is as small as possible. While ensuring that the lower layer is easy to operate, the height of the skid is lowered and controlled within the transportation height limit to meet transportation requirements.

[0028] The pipelines on the skid that exceed the transport height and the pipelines connected inside the skid are connected by flanges, ensuring that the pipelines that exceed the transport height are prefabricated in the factory and can be directly assembled on the project site. This solves the transport height problem and avoids secondary welding construction on the project site, saving costs.

[0029] The regeneration gas cooler 8 and the regeneration gas-water separator 9 are arranged up and down to ensure that the gas-liquid two-phase after cooling by the regeneration gas cooler 8 can flow from top to bottom into the regeneration gas-water separator 9 to avoid liquid accumulation.

Claims

1. A skid-mounted natural gas dehydration and mercury removal module, comprising: A natural gas filter separator, a natural gas gas-water separator, a molecular sieve adsorption tower, a regeneration gas heater, a regeneration gas cooler, a regeneration gas-water separator, a demercuration bed, a demercuration filter, and a fuel gas tank, characterized in that: three molecular sieve adsorption towers are provided, the inlet of the natural gas filter separator is used to be connected to the raw gas delivery pipe, the outlet of the natural gas filter separator is connected to the natural gas inlet of the natural gas deacidification module through a pipeline, the natural gas outlet of the natural gas deacidification module is connected to the natural gas inlet of the natural gas gas-water separator through a pipeline, the natural gas outlet of the natural gas gas-water separator is connected to the inlet of the main air supply pipe, the outlet of the main air supply pipe is respectively connected to the inlet of three branch air intake pipes, the outlets of the three branch air intake pipes are respectively connected to the top inlet of the three molecular sieve adsorption towers, the bottom outlets of the three molecular sieve adsorption towers are respectively connected to the inlet of the demercuration bed through an outgoing air pipe, the outlet of the demercuration bed is connected to the inlet of the demercuration filter through a pipeline, the main air supply pipe is connected in series with a first pressure reducing valve, the three branch air intake pipes are respectively connected in series with air intake switch valves, and the three outgoing air pipes are respectively connected in series with air outlet valves. Switch valve, one end of the regeneration gas inlet pipe is connected to the main air supply pipe, and the connecting point is located in front of the first pressure reducing valve, the other end of the regeneration gas inlet pipe is connected to the three branch air inlet pipes through pipes with switch valves, and each connecting point is located behind the corresponding air inlet switch valve, the inlet of the regeneration gas cooler is connected to the three branch air inlet pipes through pipes with switch valves, and each connecting point is located behind the corresponding air inlet switch valve, the outlet of the regeneration gas cooler is connected to the air inlet of the regeneration gas-water separator through a pipe, the air outlet 1 of the regeneration gas-water separator is connected to the inlet of the fuel gas tank through a pipe with a second pressure reducing valve, the air outlet 2 of the regeneration gas-water separator is connected to the main air supply pipe through a return pipe, and the connecting point is located behind the first pressure reducing valve, the inlet of the regeneration gas heater is connected to the three outlet air pipes through pipes with switch valves, and each connecting point is located in front of the corresponding outlet switch valve, the outlet of the regeneration gas heater is connected to the three outlet air pipes through pipes with switch valves, and each connecting point is located in front of the corresponding outlet switch valve.

2. The skid-mounted natural gas dehydration and mercury removal module according to claim 1, characterized in that: The liquid phase recovery port of the natural gas gas-water separator is connected to the natural gas deacidification module through a first recovery pipeline.

3. The skid-mounted natural gas dehydration and mercury removal module according to claim 1, characterized in that: The liquid phase recovery port of the regenerated gas-water separator is connected to the natural gas deacidification module through a second recovery pipeline.

4. The skid-mounted natural gas dehydration and mercury removal module according to claim 1, characterized in that: The inlet of the natural gas filter separator is also connected to the debugging recovery pipeline, the main gas supply pipe is also connected to the deacidification unqualified recovery pipeline, and the outlet of the demercuration filter is also connected to the dehydration unqualified recovery pipeline.

5. The skid-mounted natural gas dehydration and mercury removal module according to claim 1, characterized in that: It is also equipped with an instrumentation and control system junction box, an electrical system junction box, an online analysis cabinet, an instrumentation and control system junction box, an electrical system junction box, an online analysis cabinet, a natural gas filter separator, a natural gas gas-water separator, a molecular sieve adsorption tower, a regeneration gas heater, a regeneration gas cooler, a regeneration gas-water separator, a mercury removal bed, a mercury removal filter, and a fuel gas tank, which are integrated on a skid.

6. The skid-mounted natural gas dehydration and mercury removal module according to claim 5, characterized in that: The skid is a rectangular two-layer steel structure frame. The natural gas filter separator and its inlet valve group are arranged at the front of the skid and are arranged side by side. Three molecular sieve adsorption towers and their inlet and outlet valve groups are arranged on one side of the skid behind the natural gas filter separator and are arranged in intervals from front to back. The top inlet valve group of the molecular sieve adsorption tower is located on the second-layer steel structure platform of the skid, and the bottom outlet valve group of the molecular sieve adsorption tower is located on the first-layer steel structure base of the skid. The regeneration gas-water separator, fuel gas tank, demercuration bed, demercuration filter, and regeneration gas heater are arranged on one side of the skid behind the inlet valve group of the natural gas filter separator, and are arranged in intervals from front to back. The natural gas gas-water separator is arranged at the tail of the skid and is located behind the molecular sieve adsorption tower. The natural gas gas-water separator and the regeneration gas heater are arranged side by side. A stand is provided on the second-layer steel structure platform of the skid above the regeneration gas-water separator. The regeneration gas cooler is installed on the top of the stand. The instrumentation system junction box, the electrical system junction box, and the online analysis cabinet are arranged on the side of the skid.

7. The skid-mounted natural gas dehydration and mercury removal module according to claim 6, characterized in that: The operating manholes of the natural gas filter separator, molecular sieve adsorption tower, regenerated gas-water separator, and mercury removal bed are all facing outward, which is convenient for equipment loading, packing removal and internal inspection of the equipment; the side of the regenerated gas heater core extraction faces outward, which is convenient for core extraction inspection and maintenance of the regenerated gas heater.

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