Shift gas heat recovery device

Abstract

The utility model relates to the technical field of converted gas heat recovery, and particularly discloses a converted gas heat recovery device which comprises a gas-liquid separator I, and a gas outlet of the gas-liquid separator I is connected in parallel with a desalted water preheater and an ORC power generation module through pipelines. Compared with the prior art, part of the converted gas is introduced into the ORC power generation module for heat recovery and power generation, and the heat of the converted gas is recycled. The problem of heat recovery of the converted gas at 100-135 DEG C can be solved, the heat utilization efficiency of the converted gas can be remarkably improved, and the problem of energy utilization of the converted gas is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of conversion gas heat recovery, and specifically discloses a conversion gas heat recovery device. Background Art

[0002] Shift gas is a chemical term, which refers to the mixed gas of hydrogen and carbon dioxide obtained by the reaction of carbon monoxide and water.

[0003] In the traditional conversion device, water gas is converted by the conversion furnace, and then the heat is recovered by the medium and low pressure waste heat boiler to become the conversion gas of about 135°C. The conversion gas is directly cooled with desalted water and circulating water and then sent to the purification process. For example, a water gas production heat recovery system disclosed in the patent with announcement number CN217809269U belongs to the technical field of heat recovery. It includes a water gas steam generator, multiple gas-liquid separators, a raw gas preheater, a conversion furnace and multiple low-pressure steam generators; the water gas steam generator is connected to the gas-liquid separator 1; the top of the gas-liquid separator 1 is connected to the conversion furnace through a pipeline, and the pipeline passes through the raw gas preheater; the conversion furnace is connected to the steam superheater; the steam superheater is connected to the raw gas preheater; the raw gas preheater is connected to the low-pressure steam generator 1; the low-pressure steam generator 1 is connected to the gas-liquid separator 2; the top of the gas-liquid separator 2 is connected to the low-pressure steam generator 2; the low-pressure steam generator 2 is connected to the gas-liquid separator 3.

[0004] The conversion gas contains huge energy. Direct cooling not only wastes energy, but also the temperature of the desalted water after heat exchange exceeds 115°C, which will cause damage to the internal parts when entering the deaerator. At the same time, the flow rate of desalted water and circulating water used for heat exchange is too large, which puts huge pressure on the desalted water system and the circulating water system. Therefore, it is necessary to solve the heat recovery problem of the existing conversion device. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides a conversion gas heat recovery device to solve the problem that the conversion gas contains huge energy and direct cooling causes energy waste.

[0006] To achieve the above purpose, the technical solution of the utility model is:

[0007] A conversion gas heat recovery device includes a gas-liquid separator 1, wherein the gas outlet of the gas-liquid separator 1 is connected in parallel to a desalted water preheater and an ORC power generation module through a pipeline. The heat of the conversion gas is recovered and utilized by introducing part of the conversion gas into the ORC power generation module for heat recovery and power generation. The problem of heat recovery of 100-135°C conversion gas can be solved, the heat utilization efficiency of the conversion gas can be significantly improved, and the problem of energy utilization of the conversion gas can be solved.

[0008] Preferably, the ORC power generation module includes an evaporator; the gas outlet of the gas-liquid separator 1 is connected to the evaporator inlet through the evaporator inlet valve; the evaporator gas outlet is connected to the inlet of the circulating water cooler through the evaporator outlet valve; the outlet of the circulating water cooler is connected to the gas-liquid separator 2; the gas outlet of the gas-liquid separator 2 is connected to the low-temperature methanol process.

[0009] Preferably, the gas outlet of the desalted water preheater is connected to the inlet of the circulating water cooler through a desalted water preheater outlet valve.

[0010] Preferably, the heat exchange working fluid outlet of the evaporator is connected to the turbine generator; the turbine generator outlet is connected to the condenser; the condenser is connected to the working fluid feed pump; and the working fluid feed pump is connected to the heat exchange working fluid inlet of the evaporator.

[0011] Preferably, a desalted water preheater inlet valve is provided on the pipeline between the desalted water preheater and the gas-liquid separator.

[0012] Preferably, the heat exchange medium outlet of the desalted water preheater is connected in parallel to a cooler and a deaerator.

[0013] The beneficial effects of the utility model are:

[0014] 1. By introducing part of the conversion gas into the ORC power generation module for heat recovery and power generation, the heat of the conversion gas can be recovered and utilized. This can solve the problem of heat recovery of 100-135℃ conversion gas, significantly improve the utilization efficiency of conversion gas heat, and solve the problem of conversion gas energy utilization.

[0015] 2. The conversion gas from the gas-liquid separator 1 is divided into two parts. Most of the conversion gas enters the ORC power generation module, and the outlet temperature of this part of the conversion gas is controlled to be less than 65°C; a small part of the conversion gas is cooled by the desalted water preheater to make the outlet temperature of the conversion gas less than 70°C, and after being mixed with the conversion gas from the ORC power generation module, it is further cooled by the circulating water cooler and sent to the low-temperature methanol washing process. By introducing part of the conversion gas into the ORC power generation module, the amount of desalted water and circulating water can be reduced, and electricity can be produced as a by-product, realizing the recovery and utilization of the heat of the conversion gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Description of reference numerals:

[0019] 1-gas-liquid separator 1, 2-evaporator inlet valve, 3-desalted water preheater inlet valve, 4-ORC power generation module, 5-evaporator, 6-evaporator outlet valve, 7-circulating water cooler, 8-gas-liquid separator 2, 9-turbine generator, 10-condenser, 11-working fluid feed pump, 12-desalted water preheater outlet valve, 13-desalted water preheater, 14-deaerator, 15-cooler. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] like Figure 1 As shown, a conversion gas heat recovery device includes a gas-liquid separator 1, and the gas outlet of the gas-liquid separator 1 is connected in parallel to a desalted water preheater 13 and an ORC power generation module 4 through a pipeline. By introducing part of the conversion gas into the ORC power generation module 4 for heat recovery and power generation, the heat of the conversion gas is recovered and utilized. It can solve the problem of heat recovery of 100-135℃ conversion gas, significantly improve the heat utilization efficiency of the conversion gas, and solve the problem of energy utilization of the conversion gas.

[0022] In the above configuration, the ORC power generation module 4 includes an evaporator 5; the gas outlet of the gas-liquid separator 1 is connected to the inlet of the evaporator 5 through the evaporator inlet valve 2; the gas outlet of the evaporator 5 is connected to the inlet of the circulating water cooler 7 through the evaporator outlet valve 6; the outlet of the circulating water cooler 7 is connected to the gas-liquid separator 2 8; the gas outlet of the gas-liquid separator 2 8 is connected to the low-temperature methanol process. The gas outlet of the desalted water preheater 13 is connected to the inlet of the circulating water cooler 7 through the desalted water preheater outlet valve 12. The heat exchange working medium outlet of the evaporator 5 is connected to the turbine generator 9; the outlet of the turbine generator 9 is connected to the condenser 10; the condenser 10 is connected to the working medium feed pump 11; the working medium feed pump 11 is connected to the heat exchange working medium inlet of the evaporator 5. A desalted water preheater inlet valve 3 is provided on the pipeline between the desalted water preheater 13 and the gas-liquid separator 1. The heat exchange working medium outlet of the desalted water preheater 13 is connected to the cooler 15 and the deaerator 14.

[0023] The conversion gas from the medium and low pressure waste heat boiler is introduced into the gas-liquid separator 1, and the conversion gas at the outlet of the gas-liquid separator 1 is divided into two parts. One part enters the evaporator 5 in the ORC power generation module 4 through the evaporator inlet valve 2 and the pipeline, and after heat exchange with the heat exchange medium in the evaporator 5 and cooling to 55°C, enters the inlet pipeline of the circulating water cooler 7 through the evaporator outlet valve 6 and the pipeline. The conversion gas after heat exchange enters the gas-liquid separator 8, and then is sent to the low-temperature methanol washing process; the heat exchange medium in the evaporator 5 is heated by the conversion gas and enters the turbine generator 9 to generate electricity. After the heat exchange medium is generated by the turbine generator 9, it enters the condenser 10, and then is pressurized by the working medium feed pump 11 and sent to the evaporator 5 to complete a cycle.

[0024] The conversion gas at the outlet of the gas-liquid separator 1 is divided into two parts. Most of the conversion gas enters the ORC power generation module 4, and the outlet temperature of this part of the conversion gas is controlled to be less than 65°C; a small part of the conversion gas is cooled by the desalted water preheater 13 to make the outlet temperature of the conversion gas less than 70°C, and after being mixed with the conversion gas from the ORC power generation module 4, it is further cooled by the circulating water cooler 7 and sent to the low-temperature methanol washing process. By introducing part of the conversion gas into the ORC power generation module 4, the amount of desalted water and circulating water is reduced, and at the same time, electricity can be produced as a by-product, realizing the recovery and utilization of the heat of the conversion gas.

[0025] The amount of conversion gas going to the ORC power generation module 4 is regulated by the evaporator inlet valve 2 and the evaporator outlet valve 6, and the amount of conversion gas passing through the desalted water preheater 13 is regulated so that the outlet temperature of the conversion gas leaving the desalted water preheater 13 is less than 70°C, and the temperature of the desalted water is less than 110°C; the remaining conversion gas all enters the ORC power generation module 4 for recovery and power generation, and the outlet temperature of this part of the conversion gas is controlled to be less than 65°C, so as to realize the comprehensive utilization of the conversion gas energy.

[0026] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions shall be within the scope of the utility model / any person of ordinary skill in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the utility model, and they shall be within the scope of protection of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope of protection of the claims.

Claims

1. A shift gas heat recovery device, comprising a gas-liquid separator (1), characterized in that: The gas outlet of the gas-liquid separator 1 (1) is connected in parallel to the desalted water preheater (13) and the ORC power generation module (4) through a pipeline; The ORC power generation module (4) comprises an evaporator (5); the gas outlet of the gas-liquid separator 1 (1) is connected to the inlet of the evaporator (5) through the evaporator inlet valve (2); the gas outlet of the evaporator (5) is connected to the inlet of the circulating water cooler (7) through the evaporator outlet valve (6); the outlet of the circulating water cooler (7) is connected to the gas-liquid separator 2 (8); and the gas outlet of the gas-liquid separator 2 (8) is connected to the low-temperature methanol process.

2. The shift gas heat recovery device according to claim 1, characterized in that: The gas outlet of the desalted water preheater (13) is connected to the inlet of the circulating water cooler (7) through the desalted water preheater outlet valve (12).

3. The shift gas heat recovery device according to claim 1 or 2, characterized in that: The heat exchange working medium outlet of the evaporator (5) is connected to the turbine generator (9); the outlet of the turbine generator (9) is connected to the condenser (10); the condenser (10) is connected to the working medium feed pump (11); and the working medium feed pump (11) is connected to the heat exchange working medium inlet of the evaporator (5).

4. The shift gas heat recovery device according to claim 2, characterized in that: A desalted water preheater inlet valve (3) is provided on the pipeline between the desalted water preheater (13) and the gas-liquid separator 1 (1).

5. The shift gas heat recovery device according to claim 2, characterized in that: The heat exchange medium outlet of the desalted water preheater (13) is connected in parallel to a cooler (15) and a deaerator (14).

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