Isothermal shift refrigeration cycle device

Abstract

The utility model belongs to carbon monoxide shift reaction waste heat utilization and production operation technical field of coal chemical industry device, concretely relates to a kind of isothermal shift refrigeration cycle device.The device includes detoxification tank, isothermal shift furnace, raw material gas preheater, refrigeration cycle system and several pipelines, and the reaction heat of isothermal shift furnace can be effectively utilized to be used for refrigeration by heating boiler water, obtain low-temperature cold energy, avoid byproduct saturated steam difficult to be incorporated into steam pipe network, cause energy waste and other problems.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat utilization and production operation technology of carbon monoxide conversion reaction in coal chemical plants, specifically relating to an isothermal conversion refrigeration cycle device. Background Technology

[0002] In the carbon monoxide conversion unit of a coal chemical plant, the reaction heat generated by the isothermal conversion furnace, at a temperature of approximately 240–260℃, is classified as a medium-to-low-grade heat source. In traditional processes, it is typically recovered and utilized as a byproduct of 6.0MPa high-pressure boiler water, producing 2.0–2.5MPa medium-to-low-pressure saturated steam.

[0003] The main drawbacks of the above process and equipment are that they consume a large amount of boiler feedwater to produce medium and low pressure saturated steam. Moreover, since the saturated steam cannot be directly connected to the steam network, a steam superheater is required, resulting in high energy consumption. Sometimes, excess steam that cannot be balanced even needs to be vented, causing a great waste of energy. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an isothermal conversion refrigeration cycle device. This device can effectively utilize the reaction heat of the isothermal conversion furnace to heat boiler water for refrigeration, thereby obtaining low-temperature cooling capacity. It avoids problems such as the difficulty of integrating by-product saturated steam into the steam pipeline network, which leads to energy waste, and improves the operating efficiency of the device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An isothermal conversion refrigeration cycle device includes an isothermal conversion furnace, crude syngas from outside the interface passes through a detoxification tank, an isothermal conversion furnace, and a feed gas preheater, and the converted gas from the feed gas preheater goes to a cooling system.

[0007] The output end of the high-pressure boiler water of the isothermal converter is connected to the isothermal converter through a regenerator;

[0008] The regenerator's circulating working fluid is connected in sequence through a condenser, a refrigerant heat exchanger, and another refrigerant heat exchanger via pipelines.

[0009] In the above-mentioned device: the gaseous working fluid of the evaporator is connected in sequence to the refrigerant heat exchanger, absorber, solution circulation pump, solution heat exchanger and regenerator through pipelines.

[0010] In the above device: the output end at the bottom of the regenerator is connected to the absorber through a solution heat exchanger.

[0011] In some more specific technical solutions, the device includes a detoxification tank, an isothermal conversion furnace, a raw gas preheater, a refrigeration cycle system, and several pipelines. The refrigeration cycle system includes a regenerator, a condenser, a refrigerant heat exchanger, an evaporator, an absorber, a solution circulation pump, and a solution heat exchanger.

[0012] The crude syngas pipeline output from outside the boundary is connected to the detoxification tank, the detoxification tank pipeline output is connected to the shell-side inlet of the isothermal converter, and the isothermal converter shell-side outlet pipeline is connected to the input of the raw gas preheater.

[0013] In this utility model, the refrigeration cycle system includes a regenerator, a condenser, a refrigerant heat exchanger, an evaporator, an absorber, a solution circulation pump, and a solution heat exchanger.

[0014] In this utility model's technical solution: the crude syngas pipeline output end from outside the boundary is connected to the detoxification tank; the detoxification tank pipeline output end is connected to the shell-side inlet of the isothermal converter; the isothermal converter shell-side outlet pipeline is connected to the input end of the raw material gas preheater; the isothermal converter tube-side output end pipeline is connected to the isothermal converter tube-side input end after passing through the regenerator.

[0015] In this utility model's technical solution: the top circulating working fluid from the regenerator passes through the condenser, refrigerant heat exchanger, and valve #5 in sequence via pipelines and is connected to the evaporator.

[0016] The beneficial effects of this utility model are:

[0017] The device includes a detoxification tank, an isothermal converter, a raw gas preheater, a refrigeration cycle system, and several pipelines. It can effectively utilize the reaction heat of the isothermal converter to heat boiler water for refrigeration, obtain low-temperature cooling capacity, avoid problems such as the difficulty of integrating by-product saturated steam into the steam network, which would cause energy waste, and improve the operating efficiency of the device. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the present invention.

[0019] In the diagram: 1-Detoxification tank, 2-Isothermal converter, 3-Raw gas preheater, 4-Refrigeration cycle system, 401-Regenerator, 402-Condenser, 403-Refrigerant heat exchanger, 404-Evaporator, 405-Absorber, 406-Solution circulation pump, 407-Solution heat exchanger, V5-Pressure reducing valve. Detailed Implementation

[0020] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited thereto:

[0021] like Figure 1As shown, an isothermal conversion refrigeration cycle device includes a detoxification tank 1, an isothermal conversion furnace 2, a raw material gas preheater 3, a refrigeration cycle system 4, and several pipelines. The refrigeration cycle system includes a regenerator 401, a condenser 402, a refrigerant heat exchanger 403, an evaporator 404, an absorber 405, a solution circulation pump 406, and a solution heat exchanger 407.

[0022] The crude syngas pipeline from outside the boundary is connected to the detoxification tank 1. The pipeline output of the detoxification tank 1 is connected to the shell-side inlet of the isothermal converter 2. The shell-side outlet pipeline of the isothermal converter 2 is connected to the input of the feed gas preheater 3. The pipe-side output pipeline of the isothermal converter 2 is connected to the pipe-side input of the isothermal converter 2 after passing through the regenerator 401. The circulating working fluid from the top of the regenerator 401 is connected to the evaporator 404 via pipelines through the condenser 402, the refrigerant heat exchanger 403, and the pressure reducing valve V5. The output of the evaporator 404 is connected to the refrigerant heat exchanger 403, the absorber 405, the solution circulation pump 406, the solution heat exchanger 407, and the regenerator 401 via pipelines. The bottom output of the regenerator 401 is connected to the absorber 405 via pipelines through the solution heat exchanger 407.

[0023] The working process of this utility model is as follows: Crude syngas from outside the boundary enters the isothermal converter through a detoxification tank and undergoes a chemical reaction. The resulting converted gas is then sent to the external cooling system via a feed gas preheater. High-pressure boiler water from the isothermal converter enters the regenerator and returns to the isothermal converter. The top circulating working fluid from the regenerator passes sequentially through a condenser, a refrigerant heat exchanger, and a pressure reducing valve before entering the evaporator for evaporation to obtain cooling. The evaporated gaseous working fluid then sequentially passes through a refrigerant heat exchanger, an absorber, a solution circulation pump, and a solution heat exchanger before entering the regenerator. The output stream from the regenerator enters the absorber through the solution heat exchanger to absorb the refrigerated circulating working fluid.

[0024] The specific implementation process is as follows: 5000 Nm from outside the boundary 3 The crude syngas (temperature 240℃, pressure 3.8MPa) enters the isothermal converter after passing through the detoxification tank and undergoes a chemical reaction. The resulting converted gas has a temperature of 260℃ and is cooled to 150℃ by the feed gas preheater before being sent to the external cooling system. Water from the 6.0MPa pressure cooker, with a flow rate of 1500kg / h and a temperature of 230℃, enters the superheater, evaporator, and preheater sequentially, where it is cooled to 132℃ and returned to the isothermal converter.

[0025] The circulating working fluid (temperature 185℃, pressure 2.0MPag) with a top flow rate of 1800kg / h from the regenerator passes through the condenser and refrigerant heat exchanger in sequence. After the temperature drops to 20℃, it is depressurized to 0.1MPag through the pressure reducing valve and then enters the evaporator to evaporate and obtain 15kW of cooling capacity (temperature -15℃). The evaporated gaseous working fluid passes through the refrigerant heat exchanger and absorber in sequence. The resulting solution rich in working fluid enters the regenerator through the solution circulation pump and solution heat exchanger.

[0026] The isothermal conversion refrigeration cycle device designed in this utility model can effectively utilize the reaction heat of the isothermal conversion furnace to heat boiler water for refrigeration, thereby obtaining low-temperature cooling capacity and avoiding problems such as the difficulty of integrating the by-product saturated steam into the steam pipeline network, which would cause energy waste.

[0027] The embodiments and descriptions above are merely illustrative of the principles of this invention and do not limit the scope of protection of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. Parts not covered in this invention are identical to or can be implemented using existing technology.

Claims

1. An isothermal conversion refrigeration cycle device, characterized in that: The device includes an isothermal converter (2), crude syngas from outside the boundary passes through a detoxification tank (1), an isothermal converter (2), and a feed gas preheater (3), and the converted gas from the feed gas preheater (3) goes to a cooling system. The output end of the high-pressure boiler water of the isothermal converter (2) is connected to the isothermal converter (2) through the regenerator (401); The circulating working fluid of the regenerator (401) is connected in sequence through a condenser (402), a refrigerant heat exchanger (403), and a refrigerant heat exchanger (404) via pipelines.

2. The isothermal conversion refrigeration cycle device according to claim 1, characterized in that: The gaseous working fluid of the evaporator (404) is connected in sequence to the refrigerant heat exchanger (403), the absorber (405), the solution circulation pump (406), the solution heat exchanger (407), and the regenerator (401) through pipelines.

3. The isothermal conversion refrigeration cycle device according to claim 2, characterized in that: The output end of the regenerator (401) is connected to the absorber (405) through a solution heat exchanger (407).

Images