A vapor self-balanced double isothermal shift system
By adding specific equipment and devices to the dual isothermal conversion system, the self-balancing circulation of steam is achieved, solving the problem of external steam replenishment, improving steam utilization efficiency, and reducing waste.
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
AI Technical Summary
The existing dual isothermal conversion process requires external steam, which results in high steam consumption and significant waste, as well as problems of insufficient steam and steam decay.
The system employs a self-balancing dual isothermal conversion system. By adding a medium-temperature heat exchanger, a quencher, an isothermal conversion furnace, a medium-pressure boiler feedwater heater, and a low-pressure boiler feedwater heater, combined with a steam mixer and a condensate preheater, the system achieves internal circulation and reuse of steam.
It increases steam production, avoids external steam supplementation, reduces steam waste, and optimizes energy utilization by sending by-product steam to the low-pressure pipeline network.
Smart Images
Figure CN224280158U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal chemical technology, and in particular to a steam self-balancing dual isothermal conversion system. Background Technology
[0002] Dual isothermal shift conversion is a process used in chemical production for carbon monoxide conversion. For example, in the process of producing crude coal gas in a pulverized coal gasification unit, after the crude coal gas is separated from the condensate in the feed separator, it exchanges heat with medium-pressure superheated steam from outside in the crude coal gas preheater. Heated to a certain temperature, it then enters the detoxification tank to remove impurities. The medium-pressure superheated steam exiting the crude coal gas preheater mixes with medium-pressure saturated steam from the first steam drum and is then added to the crude coal gas exiting the detoxification tank. After adjusting the water-to-gas ratio, it enters the isothermal shift converter. In the isothermal shift converter, the crude coal gas first enters the first reaction chamber for a medium-temperature shift reaction. Boiler water from the first steam drum enters the first heat exchange tube in the first reaction chamber to remove the heat of reaction, producing medium-pressure saturated steam as a byproduct. The shifted gas then enters the second reaction chamber for a low-temperature shift reaction. Boiler water from the second steam drum enters the second heat exchange tube in the second reaction chamber to remove the heat of reaction, producing low-pressure saturated steam as a byproduct. Ultimately, the isothermal converter outputs crude hydrogen with low carbon monoxide content, a certain hydrogen content, and a specific temperature.
[0003] The dual isothermal shift converter process uses two reaction chambers for medium-temperature and low-temperature shifts respectively, and utilizes boiler water in two steam drums to remove the heat of reaction. This allows for more precise temperature control at different reaction stages, ensuring the reaction proceeds at its optimal temperature and improving the carbon monoxide conversion rate. This process not only recovers and utilizes energy by removing the byproduct steam from the heat of reaction, but the dual steam drum design also allows for more rational energy recovery and utilization based on the heat requirements of different reaction stages, further improving energy efficiency. Compared to single isothermal or adiabatic shift converters, the dual isothermal shift converter offers more precise temperature control, higher system stability, and less impact on subsequent processes, contributing to the smooth operation of the entire production process.
[0004] However, existing dual isothermal conversion processes require external steam supply for stable operation, resulting in high steam consumption and significant waste. Therefore, it is necessary to develop a self-balancing dual isothermal conversion system to solve problems such as the need for external steam supply, insufficient steam, and steam attenuation, thereby avoiding steam waste. Utility Model Content
[0005] The purpose of this invention is to provide a self-balancing dual isothermal conversion system to solve problems such as the need for external steam supply, insufficient steam, and steam attenuation, thereby avoiding steam waste.
[0006] This invention provides a steam self-balancing dual isothermal conversion system.
[0007] The self-balancing dual isothermal conversion system includes a medium-temperature heat exchanger, a primary isothermal conversion furnace, a quencher, a secondary isothermal conversion furnace, a medium-pressure boiler feedwater heater, and a low-pressure boiler feedwater heater. A mixed gas pipeline for 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 inlet of the primary isothermal conversion furnace, and the lower outlet of the primary isothermal conversion furnace is connected to the conversion gas inlet of the medium-temperature heat exchanger. The gas outlet of the heater is connected to the gas inlet of the quencher, the gas outlet of the quencher is connected to the gas inlet at the upper end of the secondary isothermal converter, the gas outlet at the lower end of the secondary isothermal converter is connected to the gas inlet of the medium-pressure boiler feedwater heater, the gas outlet of the medium-pressure boiler feedwater heater is connected to the gas inlet of the low-pressure boiler feedwater heater, and the gas outlet of the low-pressure boiler feedwater heater is connected to the gas output pipeline.
[0008] Furthermore, a steam mixer is installed on the connecting pipe between the gas outlet of the medium-pressure boiler feedwater heater and the gas inlet of the low-pressure boiler feedwater heater.
[0009] Furthermore, a condensate preheater is installed on the connecting pipe between the gas outlet at the lower end of the secondary isothermal converter and the gas inlet of the medium-pressure boiler feedwater heater.
[0010] Furthermore, a gas-water separator is installed on the connecting pipe between the water-gas and steam mixture pipeline and the mixture inlet of the medium-temperature heat exchanger.
[0011] 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 conversion furnace.
[0012] Furthermore, it also includes a steam drum I, and the two ends of the heat exchange tubes inside the primary isothermal converter are respectively connected to the steam drum I through pipes.
[0013] Furthermore, it also includes a steam drum II, and the two ends of the heat exchange tubes inside the secondary isothermal converter are respectively connected to the steam drum II through pipelines.
[0014] Furthermore, the boiler feedwater pipeline is connected to the water inlet of the steam drum I, the water inlet of the steam drum II, the water inlet of the quencher, the water inlet of the medium-pressure boiler feedwater heater, and the water inlet of the low-pressure boiler feedwater heater, respectively.
[0015] Furthermore, the steam drum I is connected to the pipeline for the mixture of water gas and steam, and is used to supply steam in a proportional manner.
[0016] Furthermore, steam drum I and steam drum II are respectively connected to the steam distribution network pipeline for outputting excess steam.
[0017] The process flow of the steam self-balancing dual isothermal conversion system described in this utility model is as follows:
[0018] Water gas (187℃, 3.95MPaG, water-to-gas ratio 0.47) from the gasification section is mixed with steam produced by the steam drum I. After being separated into liquid and liquid phases by the gas-water separator, the mixed gas enters the medium-temperature heat exchanger and is heated to 240-270℃. Then, the mixed gas enters the detoxification tank and subsequently enters the first-stage isothermal shift converter for a shift reaction. The shifted gas then enters the medium-temperature heat exchanger for heat exchange, is cooled to 258℃, and then enters the quencher to replenish moisture before entering the second-stage isothermal shift converter. The first-stage isothermal converter controls the temperature of the shift gas outlet at the lower end of the second-stage isothermal converter to 215°C using steam generated by the steam drum II, thereby controlling the CO dry basis content in the shift gas to not exceed 1%. Subsequently, the shift gas enters the condensate heater, and after being cooled by the condensate heater, the shift gas enters the medium-pressure boiler feedwater heater and is cooled to 155°C. Then, it enters the steam mixer, and after passing through the steam mixer, it enters the low-pressure boiler feedwater preheater. Finally, the shift gas outlet of the low-pressure boiler feedwater preheater is connected to the shift gas output pipeline to transport the shift gas to the next stage.
[0019] The positive effects of this utility model are:
[0020] (1) The steam self-balancing dual isothermal conversion system of this utility model adopts an internal boiler feedwater heater and steam mixer to increase the boiler water temperature and increase steam production, without the need to add external steam.
[0021] (2) The steam self-balancing dual isothermal conversion system of this utility model can send the by-product steam to the low-pressure pipeline network to avoid steam waste in the case of steam decay in the gasification waste boiler.
[0022] (3) The steam self-balancing dual isothermal conversion system described in this utility model has a simple structure and ingenious design, making it more suitable for widespread application. Attached Figure Description
[0023] The accompanying drawings are provided for a better understanding of this solution and do not constitute a limitation on this utility model. Wherein:
[0024] Figure 1 This is a schematic diagram of the steam self-balancing dual isothermal conversion system described in this utility model;
[0025] Among them, 1 is a medium-temperature heat exchanger, 2 is a primary isothermal converter, 3 is a quencher, 4 is a secondary isothermal converter, 5 is a medium-pressure boiler feedwater heater, 6 is a low-pressure boiler feedwater heater, 7 is a steam mixer, 8 is a condensate preheater, 9 is a gas-water separator, 10 is a detoxification tank, 11 is a steam drum I, 12 is a steam drum II, and 13 is a boiler feedwater pipeline. Detailed Implementation
[0026] 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.
[0027] This utility model provides a steam self-balancing dual isothermal conversion system, including a medium-temperature heat exchanger 1, a primary isothermal converter 2, a quencher 3, a secondary isothermal converter 4, a medium-pressure boiler feedwater heater 5, and a low-pressure boiler feedwater heater 6; 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 2, and the lower outlet of the primary isothermal converter 2 is connected to the conversion 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 3. The gas outlet of the quencher 3 is connected to the gas inlet at the upper end of the secondary isothermal converter 4. The gas outlet at the lower end of the secondary isothermal converter 4 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the low-pressure boiler feedwater heater 6. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipeline.
[0028] A steam mixer 7 is installed on the connecting pipe between the gas outlet of the medium-pressure boiler feedwater heater 5 and the gas inlet of the low-pressure boiler feedwater heater 6. A condensate preheater 8 is installed on the connecting pipe between the gas outlet at the lower end of the secondary isothermal converter 4 and the gas inlet of the medium-pressure boiler feedwater heater 5. A gas-water separator 9 is installed on the connecting pipe between the water-gas and steam mixture pipe and the mixture inlet of the medium-temperature heat exchanger 1. A detoxification tank 10 is installed on the connecting pipe between the mixture outlet of the medium-temperature heat exchanger 1 and the gas inlet at the upper end of the primary isothermal converter 2.
[0029] The self-balancing dual isothermal converter system of this invention further includes steam drum I11 and steam drum II 12. The heat exchange tubes inside the first-stage isothermal converter 2 are connected at both ends to steam drum I11 via pipes. Steam drum I11 is connected to the water-gas-steam mixture pipeline for proportional steam supply. The heat exchange tubes inside the second-stage isothermal converter 4 are connected at both ends to steam drum II 12 via pipes. Steam drum I11 and steam drum II 12 are respectively connected to the steam distribution network pipeline for outputting excess steam.
[0030] The boiler feedwater pipe 13 is connected to the water inlet of the steam drum I11, the water inlet of the steam drum II 12, the water inlet of the quencher 4, the water inlet of the medium-pressure boiler feedwater heater 5, and the water inlet of the low-pressure boiler feedwater heater 6, respectively.
[0031] The process flow of the steam self-balancing dual isothermal conversion 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 I11. After being separated by the gas-water separator 9, the mixture enters the medium-temperature heat exchanger 1 and is heated to 240-270℃. Then, it enters the detoxification tank 10 and the primary isothermal converter 2 for a conversion reaction. Subsequently, the converted gas enters the medium-temperature heat exchanger 1 again for heat exchange, and is cooled to 258℃. After being replenished with water in the quencher 3, the converted gas enters the secondary isothermal converter 4. The secondary isothermal converter 4 is connected to the steam drum I11. The steam generated by I12 controls the temperature of the shift gas outlet at the lower end of the secondary isothermal shift furnace to 215°C, thereby controlling the CO dry basis content in the shift gas to not exceed 1%. Subsequently, the shift gas enters the condensate heater 8. After being cooled by the condensate heater 8, the shift gas enters the medium-pressure boiler feedwater heater 5 and is cooled to 155°C. Then, it enters the steam mixer 7 and then enters the low-pressure boiler feedwater preheater 6. Finally, the shift gas outlet of the low-pressure boiler feedwater preheater 6 is connected to the shift gas output pipeline to transport the shift gas to the next stage.
[0033] Example 1
[0034] The steam self-balancing dual isothermal conversion system described in this embodiment is shown in [reference]. Figure 1It includes a gas-water separator 9, a medium-temperature heat exchanger 1, a detoxification tank 10, a primary isothermal converter 2, a quencher 3, a secondary isothermal converter 4, a condensate preheater 8, a medium-pressure boiler feedwater heater 5, a steam mixer 7, a low-pressure boiler feedwater heater 6, a steam drum I11, a steam drum II 12, and a boiler feedwater pipeline 13; the steam drum I11 is connected to the water-gas-steam mixture pipeline through a pipeline for supplying steam in proportion. A pipeline for the mixture of water gas and steam is connected to the mixed gas inlet of the gas-water separator 9. The mixed gas outlet of the gas-water separator 9 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 inlet at the upper end of the detoxification tank 10 via a pipeline. The outlet at the lower end of the detoxification tank 10 is connected to the inlet at the upper end of the first-stage isothermal converter 2 via a pipeline. The outlet at the lower end of the first-stage isothermal converter 2 is connected to the change gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The heat exchange tubes inside the first-stage isothermal converter 2 are connected to the steam drum I11 at both ends via pipes. The gas outlet of the intermediate-temperature heat exchanger 1 is connected to the gas inlet of the quencher 3 via pipes. The gas outlet of the quencher 3 is connected to the gas inlet at the upper end of the second-stage isothermal converter 4 via pipes. The gas outlet at the lower end of the second-stage isothermal converter 4 is connected to the gas inlet of the condensate preheater 8 via pipes. The heat exchange tubes inside the second-stage isothermal converter 4 are connected to the steam drum I11 at both ends via pipes. I12 is connected via pipelines. The gas outlet of the condensate preheater 8 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5 via pipelines. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the steam mixer 7 via pipelines. The gas outlet of the steam mixer 7 is connected to the gas inlet of the low-pressure boiler feedwater heater 6 via pipelines. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipeline. The boiler feedwater pipeline 13 is connected to the inlet of the steam drum I11, the inlet of the steam drum II 12, the inlet of the quencher 4, the inlet of the medium-pressure boiler feedwater heater 5, and the inlet of the low-pressure boiler feedwater heater 6 via pipelines. The steam drum I11 and the steam drum II 12 are connected to the steam distribution network pipeline for outputting excess steam.
[0035] Example 2
[0036] The steam self-balancing dual isothermal conversion system described in this embodiment includes a medium-temperature heat exchanger 1, a primary isothermal converter 2, a quencher 3, a secondary isothermal converter 4, a medium-pressure boiler feedwater heater 5, and a low-pressure boiler feedwater heater 6. A mixed gas pipeline for 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 2 via a pipeline. The lower outlet of the primary isothermal converter 2 is connected to the conversion gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The gas outlet of the quencher 3 is connected to the gas inlet of the quencher 3 via a pipe. The gas outlet of the quencher 3 is connected to the gas inlet at the upper end of the secondary isothermal converter 4 via a pipe. The gas outlet at the lower end of the secondary isothermal converter 4 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5 via a pipe. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the low-pressure boiler feedwater heater 6 via a pipe. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipe.
[0037] Example 3
[0038] The steam self-balancing dual isothermal conversion system described in this embodiment includes a medium-temperature heat exchanger 1, a primary isothermal converter 2, a quencher 3, a secondary isothermal converter 4, a medium-pressure boiler feedwater heater 5, a steam mixer 7, and a low-pressure boiler feedwater heater 6. A mixed gas pipeline for 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 2 via a pipeline. The lower outlet of the primary isothermal converter 2 is connected to the conversion gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The conversion gas outlet of the medium-temperature heat exchanger 1 is connected to the quencher 3... The gas inlet of the converter is connected by a pipe. The gas outlet of the quencher 3 is connected by a pipe to the gas inlet at the upper end of the secondary isothermal converter 4. The gas outlet at the lower end of the secondary isothermal converter 4 is connected by a pipe to the gas inlet of the medium-pressure boiler feedwater heater 5. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected by a pipe to the gas inlet of the steam mixer 7. The gas outlet of the steam mixer 7 is connected by a pipe to the gas inlet of the low-pressure boiler feedwater heater 6. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipe.
[0039] Example 4
[0040] The steam self-balancing dual isothermal conversion system described in this embodiment includes a medium-temperature heat exchanger 1, a primary isothermal converter 2, a quencher 3, a secondary isothermal converter 4, a condensate preheater 8, a medium-pressure boiler feedwater heater 5, a steam mixer 7, and a low-pressure boiler feedwater heater 6. 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 2 via a pipeline. The lower outlet of the primary isothermal converter 2 is connected to the conversion gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The conversion gas outlet of the medium-temperature heat exchanger 1 is connected to the conversion gas inlet of the quencher 3 via a pipeline. The gas outlet of the cooler 3 is connected to the gas inlet at the upper end of the secondary isothermal converter 4 via a pipe. The gas outlet at the lower end of the secondary isothermal converter 4 is connected to the gas inlet at the condensate preheater 8 via a pipe. The gas outlet of the condensate preheater 8 is connected to the gas inlet at the medium-pressure boiler feedwater heater 5 via a pipe. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet at the steam mixer 7 via a pipe. The gas outlet of the steam mixer 7 is connected to the gas inlet at the low-pressure boiler feedwater heater 6 via a pipe. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipe.
[0041] Example 5
[0042] The steam self-balancing dual isothermal conversion system described in this embodiment includes a gas-water separator 9, a medium-temperature heat exchanger 1, a primary isothermal converter 2, a quencher 3, a secondary isothermal converter 4, a condensate preheater 8, a medium-pressure boiler feedwater heater 5, a steam mixer 7, and a low-pressure boiler feedwater heater 6. A gas-water mixture pipeline is connected to the gas-water separator 9's gas-water separator inlet. The gas-water separator 9's gas-water separator outlet is connected to the medium-temperature heat exchanger 1's gas-water separator inlet via a pipeline. The medium-temperature heat exchanger 1's gas-water separator outlet is connected to the upper inlet of the primary isothermal converter 2 via a pipeline. The lower outlet of the primary isothermal converter 2 is connected to the gas-water separator 1's gas-water separator inlet via a pipeline. The medium-temperature heat exchanger 1's gas-water separator outlet... The gas inlet of the quencher 3 is connected to the gas inlet of the secondary isothermal converter 4 via a pipe. The gas outlet of the quencher 3 is connected to the gas inlet of the upper end of the secondary isothermal converter 4 via a pipe. The gas outlet of the lower end of the secondary isothermal converter 4 is connected to the gas inlet of the condensate preheater 8 via a pipe. The gas outlet of the condensate preheater 8 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5 via a pipe. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the steam mixer 7 via a pipe. The gas outlet of the steam mixer 7 is connected to the gas inlet of the low-pressure boiler feedwater heater 6 via a pipe. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipe.
[0043] Example 6
[0044] The steam self-balancing dual isothermal conversion system described in this embodiment includes a gas-water separator 9, a medium-temperature heat exchanger 1, a detoxification tank 10, a primary isothermal conversion furnace 2, a quencher 3, a secondary isothermal conversion furnace 4, a condensate preheater 8, a medium-pressure boiler feedwater heater 5, a steam mixer 7, and a low-pressure boiler feedwater heater 6. A gas-water mixture pipeline is connected to the gas-water separator 9's gas-water separator inlet. The gas-water separator 9's gas-water separator outlet is connected to the medium-temperature heat exchanger 1's gas-water separator inlet via a pipeline. The medium-temperature heat exchanger 1's gas-water separator outlet is connected to the upper inlet of the detoxification tank 10 via a pipeline. The lower outlet of the detoxification tank 10 is connected to the upper inlet of the primary isothermal conversion furnace 2 via a pipeline. The lower outlet of the primary isothermal conversion furnace 2 is connected to the gas-water mixture inlet of the medium-temperature heat exchanger 1 via a pipeline. The gas exchange outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 3 via a pipeline. The gas exchange outlet of the quencher 3 is connected to the gas inlet at the upper end of the secondary isothermal converter 4 via a pipeline. The gas exchange outlet at the lower end of the secondary isothermal converter 4 is connected to the gas inlet of the condensate preheater 8 via a pipeline. The gas exchange outlet of the condensate preheater 8 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5 via a pipeline. The gas exchange outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the steam mixer 7 via a pipeline. The gas exchange outlet of the steam mixer 7 is connected to the gas inlet of the low-pressure boiler feedwater heater 6 via a pipeline. The gas exchange outlet of the low-pressure boiler feedwater heater 6 is connected to the gas exchange output pipeline.
[0045] Example 7
[0046] The steam self-balancing dual isothermal conversion system described in this embodiment includes a gas-water separator 9, a medium-temperature heat exchanger 1, a detoxification tank 10, a primary isothermal conversion furnace 2, a quencher 3, a secondary isothermal conversion furnace 4, a condensate preheater 8, a medium-pressure boiler feedwater heater 5, a steam mixer 7, a low-pressure boiler feedwater heater 6, a steam drum I11, and a steam drum II 12; the steam drum I11 is connected to the water-gas-steam mixture pipeline through a pipeline for supplying steam in a proportional manner. A pipeline for the mixture of water gas and steam is connected to the mixed gas inlet of the gas-water separator 9. The mixed gas outlet of the gas-water separator 9 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 inlet at the upper end of the detoxification tank 10 via a pipeline. The outlet at the lower end of the detoxification tank 10 is connected to the inlet at the upper end of the first-stage isothermal converter 2 via a pipeline. The outlet at the lower end of the first-stage isothermal converter 2 is connected to the change gas inlet of the medium-temperature heat exchanger 1 via a pipeline. The heat exchange tubes inside the first-stage isothermal converter 2 are connected to the steam drum I11 at both ends via pipes. The gas outlet of the intermediate-temperature heat exchanger 1 is connected to the gas inlet of the quencher 3 via pipes. The gas outlet of the quencher 3 is connected to the gas inlet at the upper end of the second-stage isothermal converter 4 via pipes. The gas outlet at the lower end of the second-stage isothermal converter 4 is connected to the gas inlet of the condensate preheater 8 via pipes. The heat exchange tubes inside the second-stage isothermal converter 4 are connected to the steam drum I11 at both ends via pipes. 12. The gas outlet of the condensate preheater 8 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5 via a pipeline. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the steam mixer 7 via a pipeline. The gas outlet of the steam mixer 7 is connected to the gas inlet of the low-pressure boiler feedwater heater 6 via a pipeline. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipeline.
[0047] Example 8
[0048] The steam self-balancing dual isothermal conversion system described in this embodiment includes a gas-water separator 9, a medium-temperature heat exchanger 1, a detoxification tank 10, a primary isothermal conversion furnace 2, a quencher 3, a secondary isothermal conversion furnace 4, a condensate preheater 8, a medium-pressure boiler feedwater heater 5, a steam mixer 7, a low-pressure boiler feedwater heater 6, a steam drum I11, a steam drum II 12, and a boiler feedwater pipeline 13; the steam drum I11 is connected to the water-gas-steam mixture pipeline through a pipeline for supplying steam in a proportional manner. A pipeline for mixing water gas and steam is connected to the mixed gas inlet of the gas-water separator 9. The mixed gas outlet of the gas-water separator 9 is connected to the mixed gas inlet of the intermediate-temperature heat exchanger 1 via a pipeline. The mixed gas outlet of the intermediate-temperature heat exchanger 1 is connected to the upper inlet of the detoxification tank 10 via a pipeline. The lower outlet of the detoxification tank 10 is connected to the upper inlet of the first-stage isothermal converter 2 via a pipeline. The lower outlet of the first-stage isothermal converter 2 is connected to the shift gas inlet of the intermediate-temperature heat exchanger 1 via a pipeline. The two ends of the heat exchange tubes inside the first-stage isothermal converter 2 are respectively connected to the steam drum 1. 11. The gas outlet of the medium-temperature heat exchanger 1 is connected to the gas inlet of the quencher 3 via a pipeline. The gas outlet of the quencher 3 is connected to the gas inlet at the upper end of the secondary isothermal converter 4 via a pipeline. The gas outlet at the lower end of the secondary isothermal converter 4 is connected to the gas inlet of the condensate preheater 8 via a pipeline. The two ends of the heat exchange tubes inside the secondary isothermal converter 4 are respectively connected to the steam drum II 12 via pipelines. The gas outlet of the condensate preheater 8 is connected to the gas inlet of the medium-pressure boiler feedwater heater 5 via a pipeline. The gas outlet of the medium-pressure boiler feedwater heater 5 is connected to the gas inlet of the steam mixer 7 via a pipeline. The gas outlet of the steam mixer 7 is connected to the gas inlet of the low-pressure boiler feedwater heater 6 via a pipeline. The gas outlet of the low-pressure boiler feedwater heater 6 is connected to the gas output pipeline. The boiler feedwater pipe 13 is connected to the water inlet of the steam drum I11, the water inlet of the steam drum II 12, the water inlet of the quencher 4, the water inlet of the medium-pressure boiler feedwater heater 5, and the water inlet of the low-pressure boiler feedwater heater 6 via pipes.
[0049] The self-balancing dual isothermal conversion system of this invention employs an internal boiler feedwater heater and steam mixer to increase boiler water temperature and steam production, eliminating the need for external steam addition. Furthermore, to address issues such as steam attenuation in the gasification waste boiler, byproduct steam can be sent to a low-pressure pipeline network, preventing steam waste. In addition, the self-balancing dual isothermal conversion system of this invention has a simple structure and ingenious design, making it more suitable for widespread application. Depending on process requirements, shut-off valves or blind flanges can be designed into the pipelines of the self-balancing dual isothermal conversion system of this invention.
[0050] It should be understood that the above-described steam self-balancing dual isothermal conversion system can be used, and this utility model does not impose any limitations on it as long as it can achieve the desired results of the technical solution disclosed in this utility model.
[0051] 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 vapor self-balanced dual isothermal shift system, characterized by: It includes a medium-temperature heat exchanger (1), a primary isothermal converter (2), a quencher (3), a secondary isothermal converter (4), a medium-pressure boiler feedwater heater (5), and a low-pressure boiler feedwater heater (6); a water-gas and steam mixture pipeline is connected to the mixture inlet of the medium-temperature heat exchanger (1), the mixture outlet of the medium-temperature heat exchanger (1) is connected to the upper inlet of the primary isothermal converter (2), and the lower outlet of the primary isothermal converter (2) is connected to the change gas inlet of the medium-temperature heat exchanger (1). The gas outlet of the converter is connected to the gas inlet of the quencher (3), the gas outlet of the quencher (3) is connected to the gas inlet at the upper end of the secondary isothermal converter (4), the gas outlet at the lower end of the secondary isothermal converter (4) is connected to the gas inlet of the medium-pressure boiler feedwater heater (5), the gas outlet of the medium-pressure boiler feedwater heater (5) is connected to the gas inlet of the low-pressure boiler feedwater heater (6), and the gas outlet of the low-pressure boiler feedwater heater (6) is connected to the gas output pipe.
2. The vapor self-balanced double isothermal shift system according to claim 1, wherein: A steam mixer (7) is installed on the connecting pipe between the gas outlet of the medium-pressure boiler feedwater heater (5) and the gas inlet of the low-pressure boiler feedwater heater (6).
3. The vapor self-balanced double isothermal shift system according to claim 1, wherein: A condensate preheater (8) is installed on the connecting pipe between the gas outlet of the secondary isothermal converter (4) at the lower end and the gas inlet of the medium-pressure boiler feedwater heater (5).
4. The vapor self-balanced double isothermal shift system of claim 1, wherein: A gas-water separator (9) is installed on the connecting pipe between the water-gas and steam mixture pipeline and the mixture inlet of the medium-temperature heat exchanger (1).
5. The vapor self-balanced double isothermal shift system according to claim 1, wherein: A detoxification tank (10) 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 conversion furnace (2).
6. The vapor self-balanced double isothermal shift system of claim 1, wherein: It also includes a steam drum I (11), and the two ends of the heat exchange tubes inside the primary isothermal converter (2) are respectively connected to the steam drum I (11) through pipes.
7. The vapor self-balanced double isothermal shift system according to claim 6, wherein: It also includes a steam drum II (12), and the two ends of the heat exchange tubes inside the secondary isothermal converter (4) are connected to the steam drum II (12) through pipes.
8. The vapor self-balanced double isothermal shift system according to claim 7, wherein: The boiler feedwater pipe (13) is connected to the inlet of the steam drum I (11), the inlet of the steam drum II (12), the inlet of the quencher (3), the inlet of the medium-pressure boiler feedwater heater (5), and the inlet of the low-pressure boiler feedwater heater (6), respectively.
9. The vapor self-balanced double isothermal shift system of claim 6, wherein: The steam drum I (11) is connected to the mixed gas pipeline of water gas and steam, and is used to supply steam in proportion.
10. The vapor self-balanced double isothermal shift system of claim 7, wherein: Steam drum I (11) and steam drum II (12) are respectively connected to the steam pipeline network for outputting excess steam.