A highly stable dual isothermal transformation system
By setting up two primary isothermal converters and one secondary isothermal converter in the dual isothermal conversion system, and adding double shut-off valves and blind flanges at the inlet and outlet, the problem of long maintenance time caused by internal leakage due to equipment corrosion was solved, and the high stability and long-term operation of the device were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG BALING HENGYI CAPROLACTAM
- Filing Date
- 2025-04-09
- Publication Date
- 2026-05-26
Smart Images
Figure CN224280157U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal chemical technology, and in particular to a highly stable dual isothermal conversion system. Background Technology
[0002] The dual isothermal shift converter is a technology used for the conversion of carbon monoxide (CMOS) into carbon dioxide and hydrogen. It is based on the principle that CMOS reacts with water vapor in the presence of a catalyst to produce CMOS and hydrogen; this reaction is reversible and exothermic. The dual isothermal shift converter optimizes the reaction by controlling the temperature and other conditions in two isothermal shift furnaces, favoring the production of hydrogen and carbon dioxide to increase the CMOS conversion rate and meet the requirements of subsequent processes for syngas composition. In the dual isothermal shift converter, the feed gas typically enters the first-stage isothermal shift furnace, where CMOS reacts with water vapor under suitable temperature, pressure, and catalyst conditions. The heat released by the reaction is carried away by a cooling medium (such as boiler water) within the furnace, producing steam as a byproduct, thus maintaining near-isothermal conditions. The converted gas from the first-stage furnace enters the second-stage isothermal shift furnace for further reaction, further reducing the CMOS content. The second-stage furnace also uses a cooling medium to control the temperature, ultimately yielding the required converted gas.
[0003] The dual isothermal conversion process has the following advantages: (1) Significant energy saving effect. Through isothermal operation, the reaction heat by-product steam is effectively utilized, reducing external energy input. For example, Xinjiang Zhongneng Wanyuan Chemical Co., Ltd. has achieved zero steam consumption in the conversion system by using the dual isothermal conversion furnace series process; (2) Improved conversion rate. Two-stage isothermal conversion can make carbon monoxide conversion rate higher, which can significantly reduce the dry basis content of high carbon monoxide in crude gas; (3) Extended catalyst life. Isothermal operation avoids the overheating phenomenon that may occur in traditional adiabatic conversion process, reduces damage to catalyst activity, and extends the service life of catalyst; (4) Reduced system pressure drop. Compared with multi-stage adiabatic reaction and other processes, the number of equipment is relatively small, the process is relatively simple, and the system pressure drop is small.
[0004] However, existing dual isothermal converter processes all employ one primary isothermal converter and one secondary isothermal converter. Due to manufacturing defects or corrosion caused by the process, the isothermal converters can experience internal leaks. In existing dual isothermal converter processes, because only one primary isothermal converter is used, maintenance is required. Maintenance takes approximately one week, a lengthy process that is detrimental to the long-term stable operation of the unit.
[0005] Therefore, it is necessary to develop a highly stable dual isothermal conversion system that ensures stable shutdown and maintenance of the isothermal converter, while the remaining primary isothermal converter can handle 70% of the total gas volume, thereby stabilizing downstream operating conditions. Utility Model Content
[0006] The purpose of this invention is to provide a highly stable dual isothermal conversion system to solve the problem of the device's long-term stable operation during shutdown and maintenance.
[0007] This invention provides a highly stable dual isothermal transformation system.
[0008] The highly stable dual isothermal conversion system includes a medium-temperature heat exchanger, a primary isothermal conversion furnace A, a primary isothermal conversion furnace B, a quencher, and a secondary isothermal conversion furnace. A mixed gas pipeline of water gas and steam is connected to the mixed gas inlet of the medium-temperature heat exchanger. The mixed gas outlet of the medium-temperature heat exchanger is connected to the upper inlets of the primary isothermal conversion furnace A and the upper inlets of the primary isothermal conversion furnace B, respectively. The primary isothermal conversion furnaces A and B are connected in parallel. The lower outlets of the primary isothermal conversion furnaces A and B are connected to the conversion gas inlet of the medium-temperature heat exchanger, respectively. The conversion gas outlet of the medium-temperature heat exchanger is connected to the conversion gas inlet of the quencher. The conversion gas outlet of the quencher is connected to the upper conversion gas inlet of the secondary isothermal conversion furnace. The conversion gas outlet of the secondary isothermal conversion furnace is connected to the conversion gas output pipeline.
[0009] Furthermore, the upper air inlet of the primary isothermal converter A is equipped with a shut-off valve 1A and a shut-off valve 2A, and a blind plate 1A is provided between the shut-off valve 1A and the shut-off valve 2A; the lower air outlet of the primary isothermal converter A is equipped with a shut-off valve 3A and a shut-off valve 4A, and a blind plate 2A is provided between the shut-off valve 3A and the shut-off valve 4A.
[0010] Furthermore, the upper air inlet of the primary isothermal converter B is equipped with a shut-off valve 1B and a shut-off valve 2B, and a blind plate 1B is provided between the shut-off valve 1B and the shut-off valve 2B; the lower air outlet of the primary isothermal converter B is equipped with a shut-off valve 3B and a shut-off valve 4B, and a blind plate 2B is provided between the shut-off valve 3B and the shut-off valve 4B.
[0011] Furthermore, the gas inlet at the upper end of the secondary isothermal converter is equipped with a shut-off valve 1C and a shut-off valve 2C, and a blind plate 1C is provided between the shut-off valve 1C and the shut-off valve 2C; the gas outlet at the lower end of the secondary isothermal converter is equipped with a shut-off valve 3C and a shut-off valve 4C, and a blind plate 2C is provided between the shut-off valve 3C and the shut-off valve 4C.
[0012] Furthermore, a gas-water separator is provided between the water-gas and steam mixture pipeline and the medium-temperature heat exchanger. The water-gas and steam mixture pipeline is connected to the mixture inlet of the gas-water separator, and the mixture outlet of the gas-water separator is connected to the mixture inlet of the medium-temperature heat exchanger.
[0013] Furthermore, a detoxification tank is provided on the connecting pipe between the mixed gas outlet of the medium-temperature heat exchanger and the air inlet at the upper end of the first-stage isothermal converter A and the air inlet at the upper end of the first-stage isothermal converter B.
[0014] Furthermore, the heat exchange tubes inside the first-stage isothermal converter A are connected to the steam drum IA at both ends via pipes; the heat exchange tubes inside the first-stage isothermal converter B are connected to the steam drum IB at both ends via pipes; and the heat exchange tubes inside the second-stage isothermal converter are connected to the steam drum II at both ends via pipes.
[0015] Furthermore, the boiler feedwater pipeline is connected to the water inlet of the steam drum IA, the water inlet of the steam drum IB, the water inlet of the steam drum II, and the water inlet of the quencher, respectively.
[0016] Furthermore, the steam drum IA and the steam drum IB are respectively connected to the water gas and steam mixture pipeline for supplying steam in proportion.
[0017] Furthermore, the steam drum IA, the steam drum IB, and the steam drum II are respectively connected to the steam distribution network pipeline for outputting excess steam.
[0018] The process flow of the highly stable dual isothermal transformation system described in this utility model is as follows:
[0019] Water gas (187℃, 3.95MPaG, water-to-gas ratio 0.47) from the gasification section is mixed with steam produced by the steam drum IA and / or the steam drum IB. After being separated by the gas-water separator, the mixed gas enters the medium-temperature heat exchanger and is heated to 240-270℃. After entering the detoxification tank, the mixed gas enters the first-stage isothermal converter A or the first-stage isothermal converter B to undergo a conversion reaction. After heat exchange in the medium-temperature heat exchanger, the converted gas is cooled to 258℃. Then, after water replenishment in the quencher, the converted gas enters the second-stage isothermal converter. The temperature of the converted gas outlet at the lower end of the second-stage isothermal converter is controlled at 215℃ by the steam generated by the steam drum II, thereby controlling the CO dry basis content in the converted gas to not exceed 1%. The converted gas is transported to the next stage through the converted gas output pipeline.
[0020] The positive effects of this utility model are:
[0021] (1) The high-stability dual isothermal conversion system of this utility model is equipped with two primary isothermal conversion furnaces and one secondary isothermal conversion furnace. One primary isothermal conversion furnace can handle 70% of the total gas volume.
[0022] (2) The high-stability dual isothermal conversion system described in this utility model also adds dual shut-off valves and blind plates at the inlet and outlet of the isothermal conversion furnace to ensure stable shutdown and maintenance of the conversion furnace. The remaining primary isothermal conversion furnace can handle 70% of the total gas volume in order to stabilize the downstream operating conditions.
[0023] (3) The high-stability dual isothermal transformation system described in this utility model has a simple structure and ingenious design, making it more suitable for widespread application. Attached Figure Description
[0024] The accompanying drawings are provided for a better understanding of this solution and do not constitute a limitation on this utility model. Wherein:
[0025] Figure 1 This is a schematic diagram of the highly stable dual isothermal transformation system described in this utility model;
[0026] Among them, 1 is a medium-temperature heat exchanger, 2 isothermal converter A (first stage), 3 isothermal converter B (first stage), 4 quencher, 5 isothermal converter (second stage), 6 shut-off valve 1A, 7 shut-off valve 2A, 8 blind flange 1A, 9 shut-off valve 3A, 10 shut-off valve 4A, 11 blind flange 2A, 12 shut-off valve 1B, 13 shut-off valve 2B, 14 blind flange 1B, 15 shut-off valve 3B, 16 shut-off valve 4B, 17 blind flange 2B, 18 shut-off valve 1C, 19 shut-off valve 2C, 20 blind flange 1C, 21 shut-off valve 3C, 22 shut-off valve 4C, 23 blind flange 2C, 24 gas-water separator, 25 detoxification tank, 26 steam drum IA, 27 steam drum IB, 28 steam drum II, and 29 boiler feedwater pipeline. Detailed Implementation
[0027] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These embodiments should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.
[0028] This invention provides a highly stable dual isothermal converter system, comprising a medium-temperature heat exchanger 1, a primary isothermal converter A 2, a primary isothermal converter B 3, a quencher 4, and a secondary isothermal converter 5. A mixed gas pipeline of water gas and steam is connected to the mixed gas inlet of the medium-temperature heat exchanger 1. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A 2 and the upper inlet of the primary isothermal converter B 3, respectively. The primary isothermal converter A 2 and the primary isothermal converter B 3 are connected in parallel. The lower outlet of the primary isothermal converter A 2 is connected to the lower outlet of the primary isothermal converter B 3. The lower end of the gas outlet is connected to the gas inlet of the medium-temperature heat exchanger 1, the gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 4, the gas outlet of the quencher 4 is connected to the gas inlet of the upper end of the secondary isothermal converter 5, and the gas outlet of the lower end of the secondary isothermal converter 5 is connected to the gas output pipe.
[0029] The steam drums IA 26 and IB 27 are respectively connected to the water-gas and steam mixture pipeline for supplying steam in a proportional manner. The upper inlet of the primary isothermal converter A2 is equipped with shut-off valves 1A 6 and 2A 7, with a blind flange 1A 8 between them. The lower outlet of the primary isothermal converter A2 is equipped with shut-off valves 3A 9 and 4A 10, with a blind flange 2A 11 between them. The upper air inlet of the first-stage isothermal converter B3 is equipped with shut-off valves 1B12 and 2B13, with a blind flange 1B14 between them. The lower air outlet of the first-stage isothermal converter B3 is equipped with shut-off valves 3B15 and 4B16, with a blind flange 2B17 between them. The upper air inlet of the second-stage isothermal converter 5 is equipped with shut-off valves 1C18 and 2C19, with a blind flange 1C20 between them. The lower air outlet of the second-stage isothermal converter 5 is equipped with shut-off valves 3C21 and 4C22, with a blind flange 2C23 between them.
[0030] In addition, a gas-water separator 24 is installed between the water-gas and steam mixture pipeline and the medium-temperature heat exchanger 1. The water-gas and steam mixture pipeline is connected to the mixture inlet of the gas-water separator 24, and the mixture outlet of the gas-water separator 24 is connected to the mixture inlet of the medium-temperature heat exchanger 1. A detoxification tank 25 is installed on the connecting pipeline between the mixture outlet of the medium-temperature heat exchanger 1 and the upper inlet of the first-stage isothermal converter A2 and the upper inlet of the first-stage isothermal converter B3. The two ends of the heat exchange tubes inside the first-stage isothermal converter A2 are connected to the steam drum IA 26 through pipelines; the two ends of the heat exchange tubes inside the first-stage isothermal converter B3 are connected to the steam drum IB 27 through pipelines; and the two ends of the heat exchange tubes inside the second-stage isothermal converter 5 are connected to the steam drum II 28 through pipelines. The boiler feedwater pipe 29 is connected to the inlet of the steam drum IA 26, the inlet of the steam drum IB 27, the inlet of the steam drum II 28, and the inlet of the quencher 4, respectively. The steam drum IA 26, the steam drum IB 27, and the steam drum II 28 are respectively connected to the steam distribution network pipe for outputting excess steam.
[0031] The process flow of the highly stable dual isothermal transformation system described in this utility model is as follows:
[0032] Water gas (187℃, 3.95MPaG, water-to-gas ratio 0.47) from the gasification section is mixed with steam produced by the steam drum IA 26 and / or the steam drum IB 27. After being separated by the gas-water separator 24, the mixed gas enters the medium-temperature heat exchanger 1 and is heated to 240-270℃. After entering the detoxification tank 25, the mixed gas enters the first-stage isothermal converter A 2 or the first-stage isothermal converter B 3 to undergo a conversion reaction. After heat exchange in the medium-temperature heat exchanger 1, the converted gas is cooled to 258℃. Then, after water replenishment in the quencher 4, the converted gas enters the second-stage isothermal converter 5. The temperature of the converted gas outlet at the lower end of the second-stage isothermal converter 5 is controlled at 215℃ by the steam generated by the steam drum II 28, thereby controlling the CO dry basis content in the converted gas to not exceed 1%. The converted gas is transported to the next stage through the converted gas output pipeline.
[0033] Example 1
[0034] This embodiment provides a highly stable dual isothermal transformation system, see... Figure 1The system includes a gas-water separator 24, a medium-temperature heat exchanger 1, a primary isothermal converter A 2, a primary isothermal converter B 3, a detoxification tank 25, a quencher 4, and a secondary isothermal converter 5. The mixed gas pipeline for water-gas and steam is connected to the mixed gas inlet of the gas-water separator 24. The mixed gas outlet of the gas-water separator 24 is connected to the mixed gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A 2 and the upper inlet of the primary isothermal converter B 3 via pipelines. The primary isothermal converter A 2 and the primary isothermal converter B 3 are connected in parallel. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A 2 and the primary isothermal converter B 3 via pipelines. A detoxification tank 25 is provided on the connecting pipe between the upper air inlets of the first-stage isothermal converter A 2 and the lower air outlet of the first-stage isothermal converter B 3. The air outlets of the first-stage isothermal converter A 2 and the first-stage isothermal converter B 3 are respectively connected to the gas inlet of the medium-temperature heat exchanger 1 through pipes. The gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 4 through pipes. The gas outlet of the quencher 4 is connected to the gas inlet of the upper part of the second-stage isothermal converter 5 through pipes. The gas outlet of the lower part of the second-stage isothermal converter 5 is connected to the gas output pipe.
[0035] The primary isothermal converter A2 has two valves: a shut-off valve 1A6 and a shut-off valve 2A7 at its upper air inlet, with a blind flange 1A8 between them. The primary isothermal converter A2 also has two valves: a shut-off valve 3A9 and a shut-off valve 4A10 at its lower air outlet, with a blind flange 2A11 between them. Similarly, the primary isothermal converter B3 has two valves: a shut-off valve 1B12 and a shut-off valve 2B13 at its upper air inlet, with a blind flange 1B14 between them. The primary isothermal converter B3 also has two valves: a shut-off valve 3B15 and a shut-off valve 4B16 at its lower air outlet, with a blind flange 2B17 between them. The upper gas inlet of the secondary isothermal converter 5 is equipped with shut-off valves 1C 18 and 2C 19, and a blind plate 1C 20 is provided between the shut-off valves 1C 18 and 2C 19; the lower gas outlet of the secondary isothermal converter 5 is equipped with shut-off valves 3C 21 and 4C 22, and a blind plate 2C 23 is provided between the shut-off valves 3C 21 and 4C 22.
[0036] Furthermore, the heat exchange tubes inside the first-stage isothermal converter A2 are connected at both ends to the steam drum IA 26 via pipes; the heat exchange tubes inside the first-stage isothermal converter B3 are connected at both ends to the steam drum IB 27 via pipes; and the heat exchange tubes inside the second-stage isothermal converter 5 are connected at both ends to the steam drum II 28 via pipes. The boiler feedwater pipe 29 is connected to the inlet of the steam drum IA 26, the inlet of the steam drum IB 27, the inlet of the steam drum II 28, and the inlet of the quencher 4. The steam drums IA 26 and IB 27 are connected to the water-gas and steam mixture pipe for proportional steam supply. The steam drums IA 26, IB 27, and II 28 are connected to the steam distribution network pipe for outputting excess steam.
[0037] Example 2
[0038] This embodiment provides a highly stable dual isothermal converter system, including a medium-temperature heat exchanger 1, a primary isothermal converter A2, a primary isothermal converter B3, a quencher 4, and a secondary isothermal converter 5. A mixed gas pipeline of water gas and steam is connected to the mixed gas inlet of the medium-temperature heat exchanger 1. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A2 and the upper inlet of the primary isothermal converter B3 via pipelines. The primary isothermal converter A2 and the primary isothermal converter B3 are connected in parallel. The lower outlet of the primary isothermal converter A2 and the primary isothermal converter B3 are connected in parallel. The lower end of the gas outlet is connected to the gas inlet of the medium-temperature heat exchanger 1 through a pipe. The gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 4 through a pipe. The gas outlet of the quencher 4 is connected to the gas inlet of the upper end of the secondary isothermal converter 5 through a pipe. The gas outlet of the lower end of the secondary isothermal converter 5 is connected to the gas output pipe.
[0039] Example 3
[0040] This embodiment provides a highly stable dual isothermal converter system, including a medium-temperature heat exchanger 1, a primary isothermal converter A2, a primary isothermal converter B3, a quencher 4, and a secondary isothermal converter 5. A mixed gas pipeline of water gas and steam is connected to the mixed gas inlet of the medium-temperature heat exchanger 1. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A2 and the upper inlet of the primary isothermal converter B3 via pipelines. The primary isothermal converter A2 and the primary isothermal converter B3 are connected in parallel. The lower outlet of the primary isothermal converter A2 and the primary isothermal converter B3 are connected in parallel. The lower end of the gas outlet is connected to the gas inlet of the medium-temperature heat exchanger 1 through a pipe. The gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 4 through a pipe. The gas outlet of the quencher 4 is connected to the gas inlet of the upper end of the secondary isothermal converter 5 through a pipe. The gas outlet of the lower end of the secondary isothermal converter 5 is connected to the gas output pipe.
[0041] The primary isothermal converter A2 has two valves: a shut-off valve 1A6 and a shut-off valve 2A7 at its upper air inlet, with a blind flange 1A8 between them. The primary isothermal converter A2 also has two valves: a shut-off valve 3A9 and a shut-off valve 4A10 at its lower air outlet, with a blind flange 2A11 between them. Similarly, the primary isothermal converter B3 has two valves: a shut-off valve 1B12 and a shut-off valve 2B13 at its upper air inlet, with a blind flange 1B14 between them. The primary isothermal converter B3 also has two valves: a shut-off valve 3B15 and a shut-off valve 4B16 at its lower air outlet, with a blind flange 2B17 between them. The upper gas inlet of the secondary isothermal converter 5 is equipped with shut-off valves 1C 18 and 2C 19, and a blind plate 1C 20 is provided between the shut-off valves 1C 18 and 2C 19; the lower gas outlet of the secondary isothermal converter 5 is equipped with shut-off valves 3C 21 and 4C 22, and a blind plate 2C 23 is provided between the shut-off valves 3C 21 and 4C 22.
[0042] Example 4
[0043] This embodiment provides a highly stable dual isothermal converter system, including a gas-water separator 24, a medium-temperature heat exchanger 1, a primary isothermal converter A2, a primary isothermal converter B3, a quencher 4, and a secondary isothermal converter 5. The mixed gas pipeline for water-gas and steam is connected to the mixed gas inlet of the gas-water separator 24. The mixed gas outlet of the gas-water separator 24 is connected to the mixed gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A2 and the upper inlet of the primary isothermal converter B3 via pipelines. The primary isothermal converter A2 and the primary isothermal converter B3 are connected in parallel. The lower outlet of the primary isothermal converter A2 is connected to the lower outlet of the primary isothermal converter B3. The lower end of the gas outlet is connected to the gas inlet of the medium-temperature heat exchanger 1 through a pipe. The gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 4 through a pipe. The gas outlet of the quencher 4 is connected to the gas inlet of the upper end of the secondary isothermal converter 5 through a pipe. The gas outlet of the lower end of the secondary isothermal converter 5 is connected to the gas output pipe.
[0044] The primary isothermal converter A2 has two valves: a shut-off valve 1A6 and a shut-off valve 2A7 at its upper air inlet, with a blind flange 1A8 between them. The primary isothermal converter A2 also has two valves: a shut-off valve 3A9 and a shut-off valve 4A10 at its lower air outlet, with a blind flange 2A11 between them. Similarly, the primary isothermal converter B3 has two valves: a shut-off valve 1B12 and a shut-off valve 2B13 at its upper air inlet, with a blind flange 1B14 between them. The primary isothermal converter B3 also has two valves: a shut-off valve 3B15 and a shut-off valve 4B16 at its lower air outlet, with a blind flange 2B17 between them. The upper gas inlet of the secondary isothermal converter 5 is equipped with shut-off valves 1C 18 and 2C 19, and a blind plate 1C 20 is provided between the shut-off valves 1C 18 and 2C 19; the lower gas outlet of the secondary isothermal converter 5 is equipped with shut-off valves 3C 21 and 4C 22, and a blind plate 2C 23 is provided between the shut-off valves 3C 21 and 4C 22.
[0045] Example 5
[0046] This embodiment provides a highly stable dual isothermal converter system, including a gas-water separator 24, a medium-temperature heat exchanger 1, a primary isothermal converter A2, a primary isothermal converter B3, a detoxification tank 25, a quencher 4, and a secondary isothermal converter 5. The mixed gas pipeline for water-gas and steam is connected to the mixed gas inlet of the gas-water separator 24. The mixed gas outlet of the gas-water separator 24 is connected to the mixed gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A2 and the upper inlet of the primary isothermal converter B3 via pipelines. The primary isothermal converter A2 and the primary isothermal converter B3 are connected in parallel. The mixed gas outlet of the medium-temperature heat exchanger 1 is connected to the upper inlet of the primary isothermal converter A2 and the primary isothermal converter B3 via pipelines. A detoxification tank 25 is provided on the connecting pipe between the upper air inlets of the first-stage isothermal converter A 2 and the lower air outlet of the first-stage isothermal converter B 3. The air outlets of the first-stage isothermal converter A 2 and the first-stage isothermal converter B 3 are respectively connected to the gas inlet of the medium-temperature heat exchanger 1 through pipes. The gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 4 through pipes. The gas outlet of the quencher 4 is connected to the gas inlet of the upper part of the second-stage isothermal converter 5 through pipes. The gas outlet of the lower part of the second-stage isothermal converter 5 is connected to the gas output pipe.
[0047] The primary isothermal converter A2 has two valves: a shut-off valve 1A6 and a shut-off valve 2A7 at its upper air inlet, with a blind flange 1A8 between them. The primary isothermal converter A2 also has two valves: a shut-off valve 3A9 and a shut-off valve 4A10 at its lower air outlet, with a blind flange 2A11 between them. Similarly, the primary isothermal converter B3 has two valves: a shut-off valve 1B12 and a shut-off valve 2B13 at its upper air inlet, with a blind flange 1B14 between them. The primary isothermal converter B3 also has two valves: a shut-off valve 3B15 and a shut-off valve 4B16 at its lower air outlet, with a blind flange 2B17 between them. The upper gas inlet of the secondary isothermal converter 5 is equipped with shut-off valves 1C 18 and 2C 19, and a blind plate 1C 20 is provided between the shut-off valves 1C 18 and 2C 19; the lower gas outlet of the secondary isothermal converter 5 is equipped with shut-off valves 3C 21 and 4C 22, and a blind plate 2C 23 is provided between the shut-off valves 3C 21 and 4C 22.
[0048] The high-stability dual isothermal converter system of this invention consists of two primary isothermal converters and one secondary isothermal converter. The primary isothermal converter can handle 70% of the total gas volume. Furthermore, double shut-off valves and blind flanges are added to the inlet and outlet of the primary isothermal converter to ensure stable shutdown and maintenance. The remaining primary isothermal converter can handle 70% of the total gas volume to stabilize downstream operating conditions. The high-stability dual isothermal converter system of this invention has a simple structure and ingenious design, making it more suitable for widespread application.
[0049] It should be understood that the highly stable dual isothermal transformation system described above can be used, as long as it can achieve the desired results of the technical solution disclosed in this utility model, and this utility model does not impose any limitations on it.
[0050] The specific embodiments described above do not constitute a limitation on the scope of protection disclosed in this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection disclosed in this utility model.
Claims
1. A highly stable dual isothermal transformation system, characterized in that: The system includes a medium-temperature heat exchanger (1), a primary isothermal converter A (2), a primary isothermal converter B (3), a quencher (4), and a secondary isothermal converter (5); a mixed gas pipeline of water gas and steam is connected to the mixed gas inlet of the medium-temperature heat exchanger (1), and the mixed gas outlet of the medium-temperature heat exchanger (1) is connected to the upper inlet of the primary isothermal converter A (2) and the upper inlet of the primary isothermal converter B (3), respectively. The gas outlets at the lower ends of the first-stage isothermal converter A (2) and the first-stage isothermal converter B (3) are respectively connected to the gas inlet of the medium-temperature heat exchanger (1). The gas outlet of the medium-temperature heat exchanger (1) is connected to the gas inlet of the quencher (4). The gas outlet of the quencher (4) is connected to the gas inlet at the upper end of the second-stage isothermal converter (5). The gas outlet at the lower end of the second-stage isothermal converter (5) is connected to the gas output pipe.
2. The high-stability dual isothermal transformation system according to claim 1, characterized in that: The upper air inlet of the primary isothermal converter A (2) is equipped with a shut-off valve 1A (6) and a shut-off valve 2A (7), and a blind plate 1A (8) is provided between the shut-off valve 1A (6) and the shut-off valve 2A (7); the lower air outlet of the primary isothermal converter A (2) is equipped with a shut-off valve 3A (9) and a shut-off valve 4A (10), and a blind plate 2A (11) is provided between the shut-off valve 3A (9) and the shut-off valve 4A (10).
3. The high-stability dual isothermal transformation system according to claim 1, characterized in that: The upper air inlet of the primary isothermal converter B (3) is equipped with a shut-off valve 1B (12) and a shut-off valve 2B (13), and a blind plate 1B (14) is provided between the shut-off valve 1B (12) and the shut-off valve 2B (13); the lower air outlet of the primary isothermal converter B (3) is equipped with a shut-off valve 3B (15) and a shut-off valve 4B (16), and a blind plate 2B (17) is provided between the shut-off valve 3B (15) and the shut-off valve 4B (16).
4. The high-stability dual isothermal transformation system according to claim 1, characterized in that: The upper gas inlet of the secondary isothermal converter (5) is equipped with a shut-off valve 1C (18) and a shut-off valve 2C (19), and a blind plate 1C (20) is provided between the shut-off valve 1C (18) and the shut-off valve 2C (19); the lower gas outlet of the secondary isothermal converter (5) is equipped with a shut-off valve 3C (21) and a shut-off valve 4C (22), and a blind plate 2C (23) is provided between the shut-off valve 3C (21) and the shut-off valve 4C (22).
5. The high-stability dual isothermal transformation system according to claim 1, characterized in that: A gas-water separator (24) is provided between the water-gas and steam mixture pipeline and the medium-temperature heat exchanger (1). The water-gas and steam mixture pipeline is connected to the mixture inlet of the gas-water separator (24), and the mixture outlet of the gas-water separator (24) is connected to the mixture inlet of the medium-temperature heat exchanger (1).
6. The high-stability dual isothermal transformation system according to claim 1, characterized in that: A detoxification tank (25) is provided on the connecting pipe between the mixed gas outlet of the medium temperature heat exchanger (1) and the air inlet at the upper end of the first-stage isothermal converter A (2) and the air inlet at the upper end of the first-stage isothermal converter B (3).
7. The high-stability dual isothermal transformation system according to claim 1, characterized in that: The heat exchange tubes inside the first-stage isothermal converter A (2) are connected to the steam drum IA (26) at both ends via pipes; the heat exchange tubes inside the first-stage isothermal converter B (3) are connected to the steam drum IB (27) at both ends via pipes; the heat exchange tubes inside the second-stage isothermal converter (5) are connected to the steam drum II (28) at both ends via pipes.
8. The high-stability dual isothermal transformation system according to claim 7, characterized in that: The boiler feedwater pipe (29) is connected to the water inlet of the steam drum IA (26), the water inlet of the steam drum IB (27), the water inlet of the steam drum II (28), and the water inlet of the quencher (4), respectively.
9. The high-stability dual isothermal transformation system according to claim 7, characterized in that: The steam drum IA (26) and the steam drum IB (27) are respectively connected to the water gas and steam mixture pipeline for supplying steam in proportion.
10. The high-stability dual isothermal transformation system according to claim 7, characterized in that: The steam drum IA (26), the steam drum IB (27) and the steam drum II (28) are respectively connected to the steam pipeline network for outputting excess steam.