Heat utilization system of conversion-low-temperature methanol washing-methanol device

Abstract

The utility model provides a heat utilization system of a conversion-low-temperature methanol washing-methanol device, which belongs to the technical field of coal-to-methanol, and is characterized in that a heat recycling device is arranged, the outlet of the heat recycling device is connected with the inlet of a conversion device, the outlet of the conversion device is connected with the inlet of the heat recycling device, and the heat recycling device is connected with the low-temperature methanol washing-methanol device. The outlet of the heat recycling device is further connected with the inlet of the low-temperature methanol washing device and the inlet of the methanol device, the inlet of the low-temperature methanol washing device and the inlet of the methanol device are further connected with the recycling inlet of the heat recycling device, and cascade heat taking and cascade heat using are adopted; and the exchanged heat is supplied to the low-temperature methanol washing device and the methanol device for use, so that the surplus heat is fully recovered and reused, the consumption of cold water and cooling water and the use amount of steam are greatly reduced, and more energy is saved and the environment is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal-to-methanol production, and in particular relates to a conversion-low-temperature methanol washing-methanol device heat utilization system. Background Art

[0002] The coal-to-methanol process is divided into three categories: direct coal gasification to methanol, coke oven gas to methanol, and ammonia-methanol co-production to methanol. Among them, direct coal gasification to methanol is also called monoalcohol production, and its main process flow is: coal gasification, synthesis-gas shift, desulfurization and decarbonization purification, methanol synthesis, methanol distillation, etc. The pre-prepared coal and oxygen are used in the gasifier to produce raw gas with high CO content, and hydrogen is obtained through water-gas shift, and then the excess CO is removed through purification process. 2 and sulfide removal to obtain methanol synthesis gas, which is mainly CO, H 2 , CO 2 , H 2 O and a small amount of CH 4 , H 2 S and other gases, and the synthesis gas is compressed, synthesized, separated and other processes to obtain crude methanol; in the above-mentioned direct coal gasification process to produce methanol, the conversion-low-temperature methanol washing-methanol unit is a production unit that is started and stopped at the same time, and the low-temperature methanol washing, methanol and conversion units have more high-temperature media that are directly cooled by cooling water, resulting in a large amount of cooling water, which is not environmentally friendly. Summary of the invention

[0003] In view of this, the utility model provides an environmentally friendly conversion-low-temperature methanol washing-methanol device heat utilization system.

[0004] A conversion-low-temperature methanol washing-methanol device heat utilization system comprises a conversion device, a low-temperature methanol washing device, a methanol device, and a heat recovery device. The outlet of the conversion device is connected to the inlet of the low-temperature methanol washing device, which is connected to the methanol device to prepare methanol. The outlet of the heat recovery device is connected to the inlet of the conversion device, which is connected to the inlet of the heat recovery device. The outlet of the heat recovery device is also connected to the inlet of the low-temperature methanol washing device and the inlet of the methanol device. The inlet of the low-temperature methanol washing device and the inlet of the methanol device are also connected to the recovery inlet of the heat recovery device. The heat recovery device first exchanges heat with the conversion device, and then uses the exchanged heat to heat the low-temperature methanol washing device and the methanol device, so that the heat is recycled through the heat recovery device.

[0005] Preferably, the heat recovery device includes a heat medium water recovery unit, a first outlet of the heat medium water recovery unit is connected to the inlet of the conversion device, the outlet of the conversion device is connected to the first inlet of the heat medium water recovery unit, the second outlet of the heat medium water recovery unit is connected to the inlets of the low-temperature methanol washing device and the methanol device respectively, and the outlets of the low-temperature methanol washing device and the methanol device are connected to the second inlet of the heat medium water recovery unit.

[0006] Preferably, the heat medium water recycling unit includes a low temperature hot water tank, a low temperature hot water pump, a heat medium water conversion gas pipeline, a heat medium water non-conversion gas pipeline, a heat medium water first mixing pipeline, a heat medium water synthesis gas pipeline, a heat medium water stabilization tower pipeline, a membrane separation relaxation gas pipeline, a heat medium water thermal regeneration tower pipeline, a heat medium water tail gas pipeline, and a heat medium water second mixing pipeline;

[0007] The outlet of the low-temperature hot water tank is connected to the inlet of the low-temperature hot water pump, the outlet of the low-temperature hot water pump is respectively connected to the inlets of the heat medium water conversion gas pipeline and the heat medium water non-conversion gas pipeline, the outlet of the heat medium water conversion gas pipeline and the outlet of the heat medium water non-conversion gas pipeline are connected to the inlet of the conversion device, the outlet of the conversion device is connected to the inlet of the first heat medium water mixing pipeline, the outlet of the first heat medium water mixing pipeline is connected to the inlet of the heat medium water synthesis gas pipeline, the outlet of the heat medium water synthesis gas pipeline is connected to the inlet of the low-temperature methanol washing device, the outlet of the low-temperature methanol washing device is connected to the inlet of the heat medium water stabilization tower pipeline, the outlet of the heat medium water stabilization tower pipeline is connected to the inlet of the methanol device, the outlet of the methanol device is connected to the inlet of the membrane separation relaxation gas pipeline, the outlet of the membrane separation relaxation gas pipeline is connected to the methanol device, and the outlet of the methanol device is connected to the inlet of the second heat medium water mixing pipeline;

[0008] The outlet of the first heat medium water mixing pipeline is also connected to the inlet of the heat medium water heat regeneration tower pipeline, the outlet of the heat medium water heat regeneration tower pipeline is connected to the inlet of the low-temperature methanol washing device, the outlet of the low-temperature methanol washing device is connected to the inlet of the heat medium water tail gas pipeline, the outlet of the heat medium water tail gas pipeline is connected to the inlet of the low-temperature methanol washing device, and the outlet of the low-temperature methanol washing device is connected to the inlet of the second heat medium water mixing pipeline;

[0009] The outlet of the second heat medium water mixing pipeline is connected to the inlet of the low-temperature hot water tank.

[0010] Preferably, the transformation device comprises a transformation unit and a non-transformation unit;

[0011] The conversion unit includes a conversion gas inlet pipe, a conversion gas heat medium water heat exchanger, a conversion gas desalted water heat exchanger, a conversion gas water-cooled heat exchanger, and a conversion gas out-of-boundary pipe, wherein the conversion gas inlet pipe is connected to the shell-side inlet of the conversion gas heat medium water heat exchanger, the shell-side outlet of the conversion gas heat medium water heat exchanger is connected to the shell-side inlet of the conversion gas desalted water heat exchanger, the shell-side outlet of the conversion gas desalted water heat exchanger is connected to the shell-side inlet of the conversion gas water-cooled heat exchanger, the shell-side outlet of the conversion gas water-cooled heat exchanger is connected to the conversion gas out-of-boundary pipe, the tube-side inlet of the conversion gas heat medium water heat exchanger is connected to the outlet of the heat medium water conversion gas pipeline, and the tube-side outlet of the conversion gas heat medium water heat exchanger is connected to the inlet of the first heat medium water mixing pipeline;

[0012] The non-conversion unit includes a conversion gas inlet pipe, a non-conversion gas heat medium water heat exchanger, a non-conversion gas desalted water heat exchanger, a non-conversion gas water-cooling heat exchanger, and a non-conversion gas out-of-boundary pipe. The non-conversion gas inlet pipe is connected to the shell-side inlet of the non-conversion gas heat medium water heat exchanger, the shell-side outlet of the non-conversion gas heat medium water heat exchanger is connected to the shell-side inlet of the non-conversion gas desalted water heat exchanger, the shell-side outlet of the non-conversion gas desalted water heat exchanger is connected to the shell-side inlet of the non-conversion gas water-cooling heat exchanger, the shell-side outlet of the non-conversion gas water-cooling heat exchanger is connected to the non-conversion gas out-of-boundary pipe, the tube-side inlet of the non-conversion gas heat medium water heat exchanger is connected to the outlet of the heat medium water non-conversion gas pipeline, and the tube-side outlet of the non-conversion gas heat medium water heat exchanger is connected to the inlet of the first heat medium water mixing pipeline.

[0013] Preferably, the low-temperature methanol washing device comprises: a thermal regeneration tower, a heat medium water reboiler for the thermal regeneration tower, a heat medium water tail gas heater, a tail gas pipeline, a fresh synthesis gas pipeline, and a heat medium water synthesis gas preheater. The bottom outlet of the thermal regeneration tower is connected to the shell side inlet of the heat medium water reboiler of the thermal regeneration tower, the shell side outlet of the heat medium water reboiler of the thermal regeneration tower is connected to the bottom inlet of the thermal regeneration tower, the tube side inlet of the heat medium water reboiler of the thermal regeneration tower is connected to the outlet of the thermal regeneration tower pipeline, the tube side outlet of the heat medium water reboiler of the thermal regeneration tower is connected to the inlet of the heat medium water tail gas pipeline, and the outlet of the heat medium water tail gas pipeline is connected to the The shell side inlet of the heat medium water tail gas heater is connected, the shell side outlet of the heat medium water tail gas heater is connected to the inlet of the heat medium water second mixing pipeline, the outlet of the tail gas pipeline is connected to the tube side inlet of the heat medium water tail gas heater, the outlet of the fresh synthesis gas pipeline is connected to the tube side inlet of the heat medium water synthesis gas preheater, the tube side outlet of the heat medium water synthesis gas preheater is connected to the inlet of the conversion device, the shell side inlet of the heat medium water synthesis gas preheater is connected to the outlet of the heat medium water synthesis gas pipeline, and the shell side outlet of the heat medium water synthesis gas preheater is connected to the inlet of the heat medium water stabilization tower pipeline.

[0014] Preferably, the methanol device comprises: a stabilization tower, a heat medium water reboiler for the stabilization tower, and a heat medium water film separation heater. The bottom outlet of the stabilization tower is connected to the shell side inlet of the heat medium water reboiler for the stabilization tower, the shell side outlet of the heat medium water reboiler for the stabilization tower is connected to the bottom inlet of the stabilization tower, the tube side inlet of the heat medium water reboiler for the stabilization tower is connected to the outlet of the heat medium water stabilization tower pipeline, the tube side outlet of the heat medium water reboiler for the stabilization tower is connected to the inlet of the membrane separation relaxation gas pipeline, the outlet of the membrane separation relaxation gas pipeline is connected to the shell side inlet of the heat medium water film separation heater, and the shell side outlet of the heat medium water film separation heater is connected to the inlet of the second heat medium water mixing pipeline.

[0015] Preferably, the heat recovery device includes a desalted water unit, the first outlet of the desalted water unit is connected to the inlets of the low-temperature methanol washing device and the methanol device respectively, the outlets of the low-temperature methanol washing device and the methanol device are connected to the first inlet of the desalted water unit for heat exchange, the second outlet of the desalted water unit is connected to the tube side inlet of the conversion gas desalted water heat exchanger, and the second outlet of the desalted water unit is also connected to the tube side inlet of the non-conversion gas desalted water heat exchanger.

[0016] Preferably, the desalted water unit comprises a desalted water inlet pipe, a desalted water mixing pipe, a desalted water conversion gas pipeline, a desalted water non-conversion gas pipeline, and a desalted water exit-boundary area pipe. The outlet of the desalted water inlet pipe is respectively connected to the inlets of the low-temperature methanol washing device and the methanol device, the outlets of the low-temperature methanol washing device and the methanol device are connected to the inlet of the desalted water mixing pipe, the outlet of the desalted water mixing pipe is connected to the inlet of the desalted water conversion gas pipeline, the outlet of the desalted water mixing pipe is also connected to the inlet of the desalted water non-conversion gas pipeline, the outlet of the desalted water conversion gas pipeline is connected to the tube side inlet of the conversion gas desalted water heat exchanger, the tube side outlet of the conversion gas desalted water heat exchanger is connected to the desalted water exit-boundary area pipe, the outlet of the desalted water non-conversion gas pipeline is connected to the tube side inlet of the non-conversion gas desalted water heat exchanger, and the tube side outlet of the non-conversion gas desalted water heat exchanger is connected to the desalted water exit-boundary area pipe.

[0017] Preferably, the low-temperature methanol washing device also includes a hot regeneration tower desalted water heat exchanger, a hot regeneration tower water-cooled heat exchanger, and a hot regeneration tower reflux tank. The top of the hot regeneration tower is connected to the shell side inlet of the hot regeneration tower desalted water heat exchanger, the shell side outlet of the hot regeneration tower desalted water heat exchanger is connected to the shell side inlet of the hot regeneration tower water-cooled heat exchanger, the shell side outlet of the regeneration tower water-cooled heat exchanger is connected to the inlet of the hot regeneration tower reflux tank, the outlet of the hot regeneration tower reflux tank is connected to the reflux inlet of the hot regeneration tower, the tube side inlet of the hot regeneration tower desalted water heat exchanger is connected to the outlet of the desalted water inlet pipe, and the tube side outlet of the hot regeneration tower desalted water heat exchanger is connected to the inlet of the desalted water mixing pipe.

[0018] Preferably, the methanol device further comprises a stabilizing tower desalted water heat exchanger, a stabilizing tower water-cooled heat exchanger, and a stabilizing tower reflux tank. The top of the stabilizing tower is connected to the shell side inlet of the stabilizing tower desalted water heat exchanger, the shell side outlet of the stabilizing tower desalted water heat exchanger is connected to the inlet of the stabilizing tower reflux tank, the outlet of the stabilizing tower reflux tank is connected to the shell side inlet of the stabilizing tower water-cooled heat exchanger, the shell side outlet of the stabilizing tower water-cooled heat exchanger is connected to the inlet of the stabilizing tower reflux tank, the outlet of the stabilizing tower reflux tank is connected to the reflux inlet of the stabilizing tower, the tube side inlet of the stabilizing tower desalted water heat exchanger is connected to the outlet of the desalted water inlet pipe, and the tube side outlet of the stabilizing tower desalted water heat exchanger is connected to the inlet of the desalted water mixing pipe.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model discloses a conversion-low-temperature methanol washing-methanol device heat utilization system, by arranging a heat recovery device, the outlet of the heat recovery device is connected to the inlet of the conversion device, the outlet of the conversion device is connected to the inlet of the heat recovery device, the outlet of the heat recovery device is also connected to the inlet of the low-temperature methanol washing device and the inlet of the methanol device, the inlet of the low-temperature methanol washing device and the inlet of the methanol device are also connected to the recovery inlet of the heat recovery device, and adopts step-by-step heat extraction and step-by-step heat use. The heat recovery device first exchanges heat with the conversion device, and then supplies the exchanged heat to the low-temperature methanol washing device and the methanol device, so as to fully recover and reuse the surplus heat, greatly reducing the consumption of cold and cooling water, as well as the use of steam, and being more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a block diagram of the heat utilization system of the conversion-low-temperature methanol washing-methanol unit.

[0022] Figure 2 This is the process flow chart of the heat recovery device and conversion device.

[0023] Figure 3 This is the process flow chart of the heat recovery device, conversion device, low-temperature methanol washing, and methanol device.

[0024] Figure 4 This is the process flow chart of the heat utilization system of the low-temperature methanol washing-methanol unit.

[0025] In the figure: conversion-low temperature methanol washing-methanol device heat utilization system 10, conversion device 100, conversion unit 110, conversion gas inlet pipe 111, conversion gas heat medium water heat exchanger 112, conversion gas desalted water heat exchanger 113, conversion gas water cooling heat exchanger 114, conversion gas outbound zone pipe 115, non-conversion unit 120, non-conversion gas inlet pipe 121, non-conversion gas heat medium water heat exchanger 122, non-conversion gas desalted water heat exchanger 123, Non-conversion gas water-cooled heat exchanger 124, non-conversion gas outbound zone pipe 125, low-temperature methanol washing device 200, thermal regeneration tower 210, thermal regeneration tower heat medium water reboiler 220, thermal water tail gas heater 230, tail gas pipeline 240, fresh synthesis gas pipeline 250, heat medium water synthesis gas preheater 260, thermal regeneration tower desalted water heat exchanger 270, thermal regeneration tower water-cooled heat exchanger 280, thermal regeneration tower reflux tank 290, methanol device 300, Stabilization tower 310, stabilization tower heat medium water reboiler 320, heat medium water membrane separation heater 330, stabilization tower desalted water heat exchanger 340, stabilization tower water cooling heat exchanger 350, stabilization tower reflux tank 360, heat recycling device 400, heat medium water recycling unit 410, low temperature hot water tank 4101, low temperature hot water pump 4102, heat medium water conversion gas pipeline 4103, heat medium water non-conversion gas pipeline 4104, heat medium water first mixing pipeline 410 5. Heat medium water synthesis gas pipeline 4106, heat medium water stabilization tower pipeline 4107, membrane separation relaxation gas pipeline 4108, heat medium water thermal regeneration tower pipeline 4109, heat medium water tail gas pipeline 41010, heat medium water second mixing pipeline 41011, desalted water unit 420, desalted water inlet pipe 421, desalted water mixing pipe 422, desalted water conversion gas pipeline 423, desalted water non-conversion gas pipeline 424, desalted water out-of-boundary area pipe 425. DETAILED DESCRIPTION

[0026] The technical scheme and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0027] Please see Figures 1 to 4A conversion-low-temperature methanol washing-methanol device heat utilization system 10, comprising a conversion device 100, a low-temperature methanol washing device 200, a methanol device 300, and a heat recovery device 400, wherein the outlet of the conversion device 100 is connected to the inlet of the low-temperature methanol washing device 200, and the outlet of the low-temperature methanol washing device 200 is connected to the methanol device 300 to prepare methanol, and the outlet of the heat recovery device 400 is connected to the inlet of the conversion device 100, and the outlet of the conversion device 100 is connected to the heat recovery device 400. The heat recovery device 400 is connected to the inlet of the heat recovery device 400, and the outlet of the heat recovery device 400 is also connected to the inlet of the low-temperature methanol washing device 200 and the inlet of the methanol device 300. The inlet of the low-temperature methanol washing device 200 and the inlet of the methanol device 300 are also connected to the recovery inlet of the heat recovery device 400. The heat recovery device 400 first exchanges heat with the conversion device 100, and then uses the exchanged heat to heat the low-temperature methanol washing device 200 and the methanol device 300, so as to recycle the heat through the heat recovery device 400.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] The utility model conversion-low-temperature methanol washing-methanol device heat utilization system 10 is provided with a heat recovery device 400, the outlet of the heat recovery device 400 is connected to the inlet of the conversion device 100, the outlet of the conversion device 100 is connected to the inlet of the heat recovery device 400, the outlet of the heat recovery device 400 is also connected to the inlet of the low-temperature methanol washing device 200 and the inlet of the methanol device 300, the inlet of the low-temperature methanol washing device 200 and the inlet of the methanol device 300 are also connected to the recovery inlet of the heat recovery device 400, and adopts step-by-step heat extraction and step-by-step heat use. The heat recovery device 400 first exchanges heat with the conversion device 100, and then supplies the exchanged heat to the low-temperature methanol washing device 200 and the methanol device 300, so as to fully recover and reuse the surplus heat, greatly reducing the consumption of cold and cooling water, as well as the use of steam, and being more energy-saving and environmentally friendly.

[0030] Furthermore, the heat recovery device 400 includes a heat medium water recovery unit 410, a first outlet of the heat medium water recovery unit 410 is connected to the inlet of the conversion device 100, the outlet of the conversion device 100 is connected to the first inlet of the heat medium water recovery unit 410, the second outlet of the heat medium water recovery unit 410 is respectively connected to the inlets of the low-temperature methanol washing device 200 and the methanol device 300, and the outlets of the low-temperature methanol washing device 200 and the methanol device 300 are connected to the second inlet of the heat medium water recovery unit 410.

[0031] Further, the heat medium water recycling unit 410 includes a low temperature hot water tank 4101, a low temperature hot water pump 4102, a heat medium water conversion gas pipeline 4103, a heat medium water non-conversion gas pipeline 4104, a heat medium water first mixing pipeline 4105, a heat medium water synthesis gas pipeline 4106, a heat medium water stabilization tower pipeline 4107, a membrane separation relaxation gas pipeline 4108, a heat medium water thermal regeneration tower pipeline 4109, a heat medium water tail gas pipeline 41010, and a heat medium water second mixing pipeline 41011;

[0032] The outlet of the low-temperature hot water tank 4101 is connected to the inlet of the low-temperature hot water pump 4102, and the outlet of the low-temperature hot water pump 4102 is respectively connected to the inlets of the heat medium water conversion gas pipeline 4103 and the heat medium water non-conversion gas pipeline 4104, the outlet of the heat medium water conversion gas pipeline 4103 and the outlet of the heat medium water non-conversion gas pipeline 4104 are connected to the inlet of the conversion device 100, and the outlet of the conversion device 100 is connected to the inlet of the heat medium water first mixing pipeline 4105, and the outlet of the heat medium water first mixing pipeline 4105 is connected to the inlet of the heat medium water synthesis gas pipeline 4106. The outlet of the heat medium water synthesis gas pipeline 4106 is connected to the inlet of the low-temperature methanol washing device 200, the outlet of the low-temperature methanol washing device 200 is connected to the inlet of the heat medium water stabilizing tower pipeline 4107, the outlet of the heat medium water stabilizing tower pipeline 4107 is connected to the inlet of the methanol device 300, the outlet of the methanol device 300 is connected to the inlet of the membrane separation relaxation gas pipeline 4108, the outlet of the membrane separation relaxation gas pipeline 4108 is connected to the methanol device 300, and the outlet of the methanol device 300 is connected to the inlet of the heat medium water second mixing pipeline 41011;

[0033] The outlet of the first heat medium water mixing pipeline 4105 is also connected to the inlet of the heat medium water heat regeneration tower pipeline 4109, the outlet of the heat medium water heat regeneration tower pipeline 4109 is connected to the inlet of the low-temperature methanol washing device 200, the outlet of the low-temperature methanol washing device 200 is connected to the inlet of the heat medium water tail gas pipeline 41010, the outlet of the heat medium water tail gas pipeline 41010 is connected to the inlet of the low-temperature methanol washing device 200, and the outlet of the low-temperature methanol washing device 200 is connected to the inlet of the second heat medium water mixing pipeline 41011;

[0034] The outlet of the second heat medium water mixing pipeline 41011 is connected to the inlet of the low-temperature hot water tank 4101 to establish a heat medium water circulation system, so that the heat medium water is first used to obtain heat in the conversion device 100, and the obtained heat is used in the methanol device 300 and the low methanol washing device 200 for heat exchange. The temperature of the heat medium water after heat exchange is consistent with that of the water in the low-temperature hot water tank 4101, so as to continuously circulate heat utilization.

[0035] Furthermore, the transformation device 100 includes a transformation unit 110 and a non-transformation unit 120;

[0036] The conversion unit 110 includes a conversion gas inlet pipe 111, a conversion gas heat medium water heat exchanger 112, a conversion gas desalted water heat exchanger 113, a conversion gas water-cooled heat exchanger 114, and a conversion gas out-of-boundary pipe 115. The conversion gas inlet pipe 111 is connected to the shell side inlet of the conversion gas heat medium water heat exchanger 112, the shell side outlet of the conversion gas heat medium water heat exchanger 112 is connected to the shell side inlet of the conversion gas desalted water heat exchanger 113, the shell side outlet of the conversion gas desalted water heat exchanger 113 is connected to the shell side inlet of the conversion gas water-cooled heat exchanger 114, and the conversion gas water The shell side outlet of the cold heat exchanger 114 is connected to the conversion gas out-of-boundary pipe 115, the tube side inlet of the conversion gas heat medium water heat exchanger 112 is connected to the outlet of the heat medium water conversion gas pipeline 4103, and the tube side outlet of the conversion gas heat medium water heat exchanger 112 is connected to the inlet of the heat medium water first mixing pipeline 4105; the heat in the conversion gas is exchanged to the heat medium water and desalted water through the conversion gas heat medium water heat exchanger 112 and the conversion gas desalted water heat exchanger 113, so that the heat is reused, the temperature of the conversion gas is reduced, and the use of cooling water is reduced.

[0037] The non-conversion unit 120 includes a non-conversion gas inlet pipe 121, a non-conversion gas heat medium water heat exchanger 122, a non-conversion gas desalted water heat exchanger 123, a non-conversion gas water-cooled heat exchanger 124, and a non-conversion gas out-of-boundary pipe 125. The non-conversion gas inlet pipe 121 is connected to the shell side inlet of the non-conversion gas heat medium water heat exchanger 122, the shell side outlet of the non-conversion gas heat medium water heat exchanger 122 is connected to the shell side inlet of the non-conversion gas desalted water heat exchanger 123, the shell side outlet of the non-conversion gas desalted water heat exchanger 123 is connected to the shell side inlet of the non-conversion gas water-cooled heat exchanger 124, and the non-conversion gas out-of-boundary pipe 125. The shell side outlet of the ventilation water-cooled heat exchanger 124 is connected to the non-conversion gas exit zone pipe 125, the tube side inlet of the non-conversion gas heat medium water heat exchanger 122 is connected to the outlet of the heat medium water non-conversion gas pipeline 4104, and the tube side outlet of the non-conversion gas heat medium water heat exchanger 122 is connected to the inlet of the heat medium water first mixing pipeline 4105, so that the heat in the non-conversion gas is exchanged to the heat medium water and desalted water through the non-conversion gas heat medium water heat exchanger 122 and the non-conversion gas desalted water heat exchanger 123, so that the heat is reused, the temperature of the non-conversion gas is reduced, and the use of cooling water is reduced.

[0038] Furthermore, the low-temperature methanol washing device 200 includes: a thermal regeneration tower 210, a thermal regeneration tower heat medium water reboiler 220, a heat medium water tail gas heater 230, a tail gas pipeline 240, a fresh synthesis gas pipeline 250, and a heat medium water synthesis gas preheater 260. The bottom outlet of the thermal regeneration tower 210 is connected to the shell side inlet of the thermal regeneration tower heat medium water reboiler 220, the shell side outlet of the thermal regeneration tower heat medium water reboiler 220 is connected to the bottom inlet of the thermal regeneration tower 210, the tube side inlet of the thermal regeneration tower heat medium water reboiler 220 is connected to the outlet of the thermal regeneration tower pipeline 4109, the tube side outlet of the thermal regeneration tower heat medium water reboiler 220 is connected to the inlet of the thermal water tail gas pipeline 41010, and the outlet of the thermal water tail gas pipeline 41010 is connected to the The shell side inlet of the heat medium water tail gas heater 230 is connected, the shell side outlet of the heat medium water tail gas heater 230 is connected to the inlet of the heat medium water second mixing pipeline 41011, the outlet of the tail gas pipeline 240 is connected to the tube side inlet of the heat medium water tail gas heater 230, the outlet of the fresh synthesis gas pipeline 250 is connected to the tube side inlet of the heat medium water synthesis gas preheater 260, the tube side outlet of the heat medium water synthesis gas preheater 260 is connected to the inlet of the conversion device 100 to exchange heat with the fresh synthesis gas, the shell side inlet of the heat medium water synthesis gas preheater 260 is connected to the outlet of the heat medium water synthesis gas pipeline 4106, and the shell side outlet of the heat medium water synthesis gas preheater 260 is connected to the inlet of the heat medium water stabilization tower pipeline 4107.

[0039] Furthermore, the methanol device 300 includes: a stabilization tower 310, a stabilization tower hot coal water reboiler 320, and a heat medium water film separation heater 330. The bottom outlet of the stabilization tower 310 is connected to the shell side inlet of the stabilization tower hot coal water reboiler 320, the shell side outlet of the stabilization tower hot coal water reboiler 320 is connected to the bottom inlet of the stabilization tower 310, the tube side inlet of the stabilization tower hot coal water reboiler 320 is connected to the outlet of the heat medium water stabilization tower pipeline 4107, the tube side outlet of the stabilization tower hot coal water reboiler 320 is connected to the inlet of the membrane separation relaxation gas pipeline 4108, the outlet of the membrane separation relaxation gas pipeline 4108 is connected to the shell side inlet of the heat medium water film separation heater 330, the shell side outlet of the heat medium water film separation heater 330 is connected to the inlet of the heat medium water second mixing pipeline 41011, and the heat medium water film separation heater 330 heats the membrane separation relaxation gas.

[0040] Furthermore, the heat recovery device 400 includes a desalted water unit 420, and the first outlet of the desalted water unit 420 is connected to the inlets of the low-temperature methanol washing device 200 and the methanol device 300 respectively, and the outlets of the low-temperature methanol washing device 200 and the methanol device 300 are connected to the first inlet of the desalted water unit 420 for heat exchange, and the second outlet of the desalted water unit 420 is connected to the tube side inlet of the conversion gas desalted water heat exchanger 113, and the second outlet of the desalted water unit 420 is also connected to the tube side inlet of the non-conversion gas desalted water heat exchanger 123.

[0041] Further, the desalted water unit 420 includes a desalted water inlet pipe 421, a desalted water mixing pipe 422, a desalted water conversion gas pipeline 423, a desalted water non-conversion gas pipeline 424, and a desalted water out-of-bounds zone pipe 425. The outlet of the desalted water inlet pipe 421 is connected to the inlet of the low-temperature methanol washing device 200 and the methanol device 300, respectively. The outlet of the low-temperature methanol washing device 200 and the methanol device 300 is connected to the inlet of the desalted water mixing pipe 422. The outlet of the desalted water mixing pipe 422 is connected to the inlet of the desalted water conversion gas pipeline 423. The outlet of the desalted water mixing pipe 422 is also connected to the inlet of the desalted water non-conversion gas pipeline 424, the outlet of the desalted water conversion gas pipeline 423 is connected to the pipe side inlet of the conversion gas desalted water heat exchanger 113, the pipe side outlet of the conversion gas desalted water heat exchanger 113 is connected to the desalted water exit-boundary area pipe 425, the outlet of the desalted water non-conversion gas pipeline 424 is connected to the pipe side inlet of the non-conversion gas desalted water heat exchanger 123, and the pipe side outlet of the non-conversion gas desalted water heat exchanger 123 is connected to the desalted water exit-boundary area pipe 425.

[0042] Furthermore, the low-temperature methanol washing device 200 also includes a hot regeneration tower desalted water heat exchanger 270, a hot regeneration tower water-cooled heat exchanger 280, and a hot regeneration tower reflux tank 290. The top of the hot regeneration tower 210 is connected to the shell side inlet of the hot regeneration tower desalted water heat exchanger 270, the shell side outlet of the hot regeneration tower desalted water heat exchanger 270 is connected to the shell side inlet of the hot regeneration tower water-cooled heat exchanger 280, and the shell side outlet of the regeneration tower water-cooled heat exchanger is connected to the inlet of the hot regeneration tower reflux tank 290. The outlet of the heat regeneration tower reflux tank 290 is connected to the reflux inlet of the heat regeneration tower 210, the pipe side inlet of the heat regeneration tower desalted water heat exchanger 270 is connected to the outlet of the desalted water inlet pipe 421, and the pipe side outlet of the heat regeneration tower desalted water heat exchanger 270 is connected to the inlet of the desalted water mixing pipe 422; desalted water is used to recover the heat at the top of the heat regeneration tower 210, and the original air cooler is replaced by a heat exchanger, which reduces the floor space and power consumption, and avoids the air cooling H at the top of the heat regeneration tower 210. 2 S leakage risk.

[0043] Furthermore, the methanol device 300 also includes a stabilizing tower desalted water heat exchanger 340, a stabilizing tower water-cooled heat exchanger 350, and a stabilizing tower reflux tank 360. The top of the stabilizing tower 310 is connected to the shell side inlet of the stabilizing tower desalted water heat exchanger 340, the shell side outlet of the stabilizing tower desalted water heat exchanger 340 is connected to the inlet of the stabilizing tower reflux tank 360, the outlet of the stabilizing tower reflux tank 360 is connected to the shell side inlet of the stabilizing tower water-cooled heat exchanger 350, and the stabilizing tower water-cooled heat exchanger 350 is connected to the shell side inlet of the stabilizing tower water-cooled heat exchanger 350. 0's shell side outlet is connected to the inlet of the stabilizing tower reflux tank 360, the outlet of the stabilizing tower reflux tank 360 is connected to the reflux inlet of the stabilizing tower 310, the tube side inlet of the stabilizing tower desalted water heat exchanger 340 is connected to the outlet of the desalted water inlet pipe 421, and the tube side outlet of the stabilizing tower desalted water heat exchanger 340 is connected to the inlet of the desalted water mixing pipe 422; desalted water is used to recover the heat at the top of the heat regeneration tower 210, and the original air cooler is replaced by a heat exchanger, which reduces the floor space and power consumption.

[0044] For ease of understanding, the present invention is further described by the following examples.

[0045] Example:

[0046] The conversion units are two groups running in parallel at the same time:

[0047] 100℃、876m 3 The low-temperature hot water comes out from the outlet of the low-temperature hot water tank 4101 and is pumped to the low-temperature hot water pump 4102 at 100°C and 556m 3 Heat medium water is transported to heat medium water conversion gas pipeline 4103, 100℃, 320m 3 The heat medium water is transported to the non-conversion gas pipeline 4104. Each group of heat medium water conversion gas pipelines 4103 transfers 100℃, 278m 3 The heat medium water is transmitted to the conversion gas heat medium water heat exchanger 112 to extract heat from the 157℃, 325t / h conversion gas in the conversion gas inlet pipe 111, so that the temperature of the conversion gas is reduced from 157℃ to 135℃, and the heat medium water is increased from 100℃ to 145℃. The heat medium water non-conversion gas pipeline 4104 transfers the 100℃, 320m 3 The heat medium water is transmitted to the non-conversion gas heat medium water heat exchanger 122 to extract heat from the 169.3°C, 262t / h conversion gas in the non-conversion gas inlet pipe 121, so that the temperature of the non-conversion gas is reduced from 169.3°C to 127°C, and the heat medium water is increased from 100°C to 157°C. The heat medium water extracted from the conversion gas heat medium water heat exchanger 112 and the non-conversion gas heat medium water heat exchanger 122 is mixed in the first heat medium water mixing pipeline 4105. The heat medium water temperature in the first heat medium water mixing pipeline 4105 is 149.4°C, 876m 3, the temperature is 149.4℃, 876m 3 The heat medium water is divided into two paths, one path is 149.4℃, 486m 3 The heat medium water enters the heat medium water synthesis gas pipeline 4106, and the heat medium water synthesis gas pipeline 4106 transports the heat medium water of 149.4℃ to the heat medium water synthesis gas preheater 260 for heat exchange with the fresh synthesis gas of 110℃ and 270t / h, so that the fresh synthesis gas is heated to 142℃, and the temperature of the heat medium water is reduced to 137.9℃. The heat medium water with a temperature of 137.9℃ is transported to the heat medium water stabilization tower pipeline 4107, and the heat medium water stabilization tower pipeline 4107 transports the heat medium water of 137.9℃ to the stabilization tower hot coal water again. The boiler 320 exchanges heat with the 87.08℃, 284t / h material at the bottom of the stabilizing tower 310, heating it to 88℃, and the temperature of the heat medium water is reduced from 137.9℃ to 102.8℃. The heat medium water with a temperature of 102.8℃ is transported to the membrane separation relaxation gas pipeline 4108. The membrane separation relaxation gas pipeline 4108 transports the heat medium water with a temperature of 102.8℃ to the heat medium water membrane separation heater 330 to exchange heat with the membrane separation relaxation gas, so that the temperature of the heat medium water is reduced to 93.7℃. 93.7℃, 486m 3 The heat medium water enters the second heat medium water mixing pipeline 41011; the other temperature is 149.4℃, 390m 3 The hot medium water enters the hot medium water reboiler 220 of the hot regeneration tower and exchanges heat with the 98.93℃, 291t / h material in the hot regeneration tower 210, so that the temperature of the bottom material of the hot regeneration tower 210 increases by 99.66℃, and the hot medium water decreases from 149.4℃ to 117.6℃. The hot medium water at 117.6℃ is transported to the hot medium water tail gas pipeline 41010. The hot medium water tail gas pipeline 41010 transports the 117.6℃ hot medium water to the hot medium water tail gas heater 230 to exchange heat with the 16.3℃, 272t / h tail gas, so that the tail gas temperature increases to 57℃, which is beneficial to the subsequent tail gas treatment. The hot medium water decreases to 112℃, 112℃, 390m 3 The heat medium water enters the second heat medium water mixing pipeline 41011, so that the heat medium water in the second heat medium water mixing pipeline 41011 reaches 104.6℃ and 876m 3 The second heat medium water mixing pipeline 41011 then transports the heat medium water to the low-temperature hot water tank 4101 for circulation.

[0048] 30℃、753m 3 The desalted water enters the desalted water heat exchanger 270 of the hot regeneration tower from the outlet of the desalted water inlet pipe 421, respectively, and 333m 3 、Stability tower desalted water heat exchanger 340 in 420m 3Heat is taken to make the temperature of the desalted water reach 47°C. The desalted water at 47°C enters the desalted water mixing pipe 422. The desalted water mixing pipe 422 transports the desalted water at 47°C to 2 groups of desalted water conversion gas pipelines 423, 584m 3 、Desalted water non-conversion gas pipeline 424, 169m 3 The desalted water conversion gas pipeline 423 transports the desalted water at 47°C to the conversion gas desalted water heat exchanger 113 for heat exchange with 135°C, 325t / h, so that the conversion gas temperature is reduced from 135°C to 70°C, and the desalted water temperature is increased to 115°C. The desalted water non-conversion gas pipeline 424 transports the desalted water at 47°C to the non-conversion gas desalted water heat exchanger 123 for heat exchange with 127°C, 262t / h non-conversion gas, so that the non-conversion gas temperature is reduced from 127°C to 70°C, and the desalted water temperature is increased to 115°C. The desalted water at 115°C is transported to the thermal power device in the chemical plant through the desalted water exit zone pipe 425 for use, enters the deaerator for deoxygenation, and then enters the boiler to generate steam, thereby reducing the use of steam.

[0049] The above disclosure is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A heat utilization system of a conversion-low temperature methanol washing-methanol device, characterized in that: It includes a conversion device, a low-temperature methanol washing device, a methanol device, and a heat recovery device. The outlet of the conversion device is connected to the inlet of the low-temperature methanol washing device, which is connected to the methanol device to prepare methanol. The outlet of the heat recovery device is connected to the inlet of the conversion device, which is connected to the inlet of the heat recovery device. The outlet of the heat recovery device is also connected to the inlet of the low-temperature methanol washing device and the inlet of the methanol device. The inlet of the low-temperature methanol washing device and the inlet of the methanol device are also connected to the recovery inlet of the heat recovery device. The heat recovery device first exchanges heat with the conversion device, and then uses the exchanged heat to heat the low-temperature methanol washing device and the methanol device, so that the heat is recycled through the heat recovery device.

2. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 1, characterized in that: The heat recycling device includes a heat medium water recycling unit, a first outlet of the heat medium water recycling unit is connected to the inlet of the conversion device, the outlet of the conversion device is connected to the first inlet of the heat medium water recycling unit, the second outlet of the heat medium water recycling unit is respectively connected to the inlets of the low-temperature methanol washing device and the methanol device, and the outlets of the low-temperature methanol washing device and the methanol device are connected to the second inlet of the heat medium water recycling unit.

3. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 2, characterized in that: The heat medium water recycling unit includes a low temperature hot water tank, a low temperature hot water pump, a heat medium water conversion gas pipeline, a heat medium water non-conversion gas pipeline, a heat medium water first mixing pipeline, a heat medium water synthesis gas pipeline, a heat medium water stabilization tower pipeline, a membrane separation relaxation gas pipeline, a heat medium water thermal regeneration tower pipeline, a heat medium water tail gas pipeline, and a heat medium water second mixing pipeline; The outlet of the low-temperature hot water tank is connected to the inlet of the low-temperature hot water pump, the outlet of the low-temperature hot water pump is respectively connected to the inlets of the heat medium water conversion gas pipeline and the heat medium water non-conversion gas pipeline, the outlet of the heat medium water conversion gas pipeline and the outlet of the heat medium water non-conversion gas pipeline are connected to the inlet of the conversion device, the outlet of the conversion device is connected to the inlet of the first heat medium water mixing pipeline, the outlet of the first heat medium water mixing pipeline is connected to the inlet of the heat medium water synthesis gas pipeline, the outlet of the heat medium water synthesis gas pipeline is connected to the inlet of the low-temperature methanol washing device, the outlet of the low-temperature methanol washing device is connected to the inlet of the heat medium water stabilization tower pipeline, the outlet of the heat medium water stabilization tower pipeline is connected to the inlet of the methanol device, the outlet of the methanol device is connected to the inlet of the membrane separation relaxation gas pipeline, the outlet of the membrane separation relaxation gas pipeline is connected to the methanol device, and the outlet of the methanol device is connected to the inlet of the second heat medium water mixing pipeline; The outlet of the first heat medium water mixing pipeline is also connected to the inlet of the heat medium water heat regeneration tower pipeline, the outlet of the heat medium water heat regeneration tower pipeline is connected to the inlet of the low-temperature methanol washing device, the outlet of the low-temperature methanol washing device is connected to the inlet of the heat medium water tail gas pipeline, the outlet of the heat medium water tail gas pipeline is connected to the inlet of the low-temperature methanol washing device, and the outlet of the low-temperature methanol washing device is connected to the inlet of the second heat medium water mixing pipeline; The outlet of the second heat medium water mixing pipeline is connected to the inlet of the low-temperature hot water tank.

4. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 3 is characterized in that: The transformation device comprises a transformation unit and a non-transformation unit; The conversion unit includes a conversion gas inlet pipe, a conversion gas heat medium water heat exchanger, a conversion gas desalted water heat exchanger, a conversion gas water-cooled heat exchanger, and a conversion gas out-of-boundary pipe, wherein the conversion gas inlet pipe is connected to the shell-side inlet of the conversion gas heat medium water heat exchanger, the shell-side outlet of the conversion gas heat medium water heat exchanger is connected to the shell-side inlet of the conversion gas desalted water heat exchanger, the shell-side outlet of the conversion gas desalted water heat exchanger is connected to the shell-side inlet of the conversion gas water-cooled heat exchanger, the shell-side outlet of the conversion gas water-cooled heat exchanger is connected to the conversion gas out-of-boundary pipe, the tube-side inlet of the conversion gas heat medium water heat exchanger is connected to the outlet of the heat medium water conversion gas pipeline, and the tube-side outlet of the conversion gas heat medium water heat exchanger is connected to the inlet of the first heat medium water mixing pipeline; The non-conversion unit includes a conversion gas inlet pipe, a non-conversion gas heat medium water heat exchanger, a non-conversion gas desalted water heat exchanger, a non-conversion gas water-cooling heat exchanger, and a non-conversion gas out-of-boundary pipe. The non-conversion gas inlet pipe is connected to the shell-side inlet of the non-conversion gas heat medium water heat exchanger, the shell-side outlet of the non-conversion gas heat medium water heat exchanger is connected to the shell-side inlet of the non-conversion gas desalted water heat exchanger, the shell-side outlet of the non-conversion gas desalted water heat exchanger is connected to the shell-side inlet of the non-conversion gas water-cooling heat exchanger, the shell-side outlet of the non-conversion gas water-cooling heat exchanger is connected to the non-conversion gas out-of-boundary pipe, the tube-side inlet of the non-conversion gas heat medium water heat exchanger is connected to the outlet of the heat medium water non-conversion gas pipeline, and the tube-side outlet of the non-conversion gas heat medium water heat exchanger is connected to the inlet of the first heat medium water mixing pipeline.

5. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 4, characterized in that: The low-temperature methanol washing device comprises: a thermal regeneration tower, a heat medium water reboiler for the thermal regeneration tower, a heat medium water tail gas heater, a tail gas pipeline, a fresh synthesis gas pipeline, and a heat medium water synthesis gas preheater. The bottom outlet of the thermal regeneration tower is connected to the shell side inlet of the heat medium water reboiler of the thermal regeneration tower, the shell side outlet of the heat medium water reboiler of the thermal regeneration tower is connected to the bottom inlet of the thermal regeneration tower, the tube side inlet of the heat medium water reboiler of the thermal regeneration tower is connected to the outlet of the thermal regeneration tower pipeline, the tube side outlet of the heat medium water reboiler of the thermal regeneration tower is connected to the inlet of the heat medium water tail gas pipeline, and the outlet of the heat medium water tail gas pipeline is connected to the The shell side inlet of the heat medium water tail gas heater is connected, the shell side outlet of the heat medium water tail gas heater is connected to the inlet of the heat medium water second mixing pipeline, the outlet of the tail gas pipeline is connected to the tube side inlet of the heat medium water tail gas heater, the outlet of the fresh synthesis gas pipeline is connected to the tube side inlet of the heat medium water synthesis gas preheater, the tube side outlet of the heat medium water synthesis gas preheater is connected to the inlet of the conversion device, the shell side inlet of the heat medium water synthesis gas preheater is connected to the outlet of the heat medium water synthesis gas pipeline, and the shell side outlet of the heat medium water synthesis gas preheater is connected to the inlet of the heat medium water stabilization tower pipeline.

6. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 5, characterized in that: The methanol device comprises: a stabilization tower, a heat medium water reboiler for the stabilization tower, and a heat medium water film separation heater. The bottom outlet of the stabilization tower is connected to the shell side inlet of the heat medium water reboiler for the stabilization tower, the shell side outlet of the heat medium water reboiler for the stabilization tower is connected to the bottom inlet of the stabilization tower, the tube side inlet of the heat medium water reboiler for the stabilization tower is connected to the outlet of the heat medium water stabilization tower pipeline, the tube side outlet of the heat medium water reboiler for the stabilization tower is connected to the inlet of the membrane separation relaxation gas pipeline, the outlet of the membrane separation relaxation gas pipeline is connected to the shell side inlet of the heat medium water film separation heater, and the shell side outlet of the heat medium water film separation heater is connected to the inlet of the second heat medium water mixing pipeline.

7. The heat utilization system of the conversion-low-temperature methanol washing-methanol device according to any one of claims 1 to 6, characterized in that: The heat recovery device includes a desalted water unit, the first outlet of the desalted water unit is connected to the inlets of the low-temperature methanol washing device and the methanol device respectively, the outlets of the low-temperature methanol washing device and the methanol device are connected to the first inlet of the desalted water unit for heat exchange, the second outlet of the desalted water unit is connected to the tube side inlet of the conversion gas desalted water heat exchanger, and the second outlet of the desalted water unit is also connected to the tube side inlet of the non-conversion gas desalted water heat exchanger.

8. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 7, characterized in that: The desalted water unit comprises a desalted water inlet pipe, a desalted water mixing pipe, a desalted water conversion gas pipeline, a desalted water non-conversion gas pipeline, and a desalted water exit zone pipe. The outlet of the desalted water inlet pipe is respectively connected to the inlets of the low-temperature methanol washing device and the methanol device, the outlets of the low-temperature methanol washing device and the methanol device are connected to the inlet of the desalted water mixing pipe, the outlet of the desalted water mixing pipe is connected to the inlet of the desalted water conversion gas pipeline, the outlet of the desalted water mixing pipe is also connected to the inlet of the desalted water non-conversion gas pipeline, the outlet of the desalted water conversion gas pipeline is connected to the tube side inlet of the conversion gas desalted water heat exchanger, the tube side outlet of the conversion gas desalted water heat exchanger is connected to the desalted water exit zone pipe, the outlet of the desalted water non-conversion gas pipeline is connected to the tube side inlet of the non-conversion gas desalted water heat exchanger, and the tube side outlet of the non-conversion gas desalted water heat exchanger is connected to the desalted water exit zone pipe.

9. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 8, characterized in that: The low-temperature methanol washing device also includes a thermal regeneration tower desalted water heat exchanger, a thermal regeneration tower water-cooled heat exchanger, and a thermal regeneration tower reflux tank. The top of the thermal regeneration tower is connected to the shell side inlet of the thermal regeneration tower desalted water heat exchanger, the shell side outlet of the thermal regeneration tower desalted water heat exchanger is connected to the shell side inlet of the thermal regeneration tower water-cooled heat exchanger, the shell side outlet of the regeneration tower water-cooled heat exchanger is connected to the inlet of the thermal regeneration tower reflux tank, the outlet of the thermal regeneration tower reflux tank is connected to the reflux inlet of the thermal regeneration tower, the tube side inlet of the thermal regeneration tower desalted water heat exchanger is connected to the outlet of the desalted water inlet pipe, and the tube side outlet of the thermal regeneration tower desalted water heat exchanger is connected to the inlet of the desalted water mixing pipe.

10. The heat utilization system of the conversion-low temperature methanol washing-methanol device according to claim 8, characterized in that: The methanol device also includes a stabilization tower desalted water heat exchanger, a stabilization tower water-cooled heat exchanger, and a stabilization tower reflux tank. The top of the stabilization tower is connected to the shell side inlet of the stabilization tower desalted water heat exchanger, the shell side outlet of the stabilization tower desalted water heat exchanger is connected to the inlet of the stabilization tower reflux tank, the outlet of the stabilization tower reflux tank is connected to the shell side inlet of the stabilization tower water-cooled heat exchanger, the shell side outlet of the stabilization tower water-cooled heat exchanger is connected to the inlet of the stabilization tower reflux tank, the outlet of the stabilization tower reflux tank is connected to the reflux inlet of the stabilization tower, the tube side inlet of the stabilization tower desalted water heat exchanger is connected to the outlet of the desalted water inlet pipe, and the tube side outlet of the stabilization tower desalted water heat exchanger is connected to the inlet of the desalted water mixing pipe.

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