Comprehensive utilization system for high-calorific-value waste gas of methanol production factory

Abstract

The utility model discloses a comprehensive utilization system for high-calorific-value waste gas of a methanol production plant. The comprehensive utilization system comprises a gasification part torch, a synthesis part torch, a hydrogen recovery system, a sulfur recovery system and a boiler, an evaporation hot water tower of the gasification device is connected with the sulfur recovery system and the gasification part torch; the methanol synthesis device is connected with the hydrogen recovery system, and the hydrogen recovery system is connected with the sulfur recovery system, the boiler and the synthesis part torch. The device has the advantages that acid gas generated in the gasification device and tail gas generated after purge gas output by the methanol synthesis device is subjected to hydrogen recovery are conveyed to the sulfur recovery system to be subjected to blending combustion, the heat value of combustible gas in the gas and byproduct steam are fully utilized, and high-heat-value gas in factory waste gas is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of coal chemical industry, in particular to a comprehensive utilization system of high calorific value waste gas from a methanol production plant. Background Art

[0002] At present, in the process of deep processing of coal as raw material to produce methanol products, the systems involved in the preparation mainly include gasification equipment, purification equipment, methanol synthesis equipment, etc.

[0003] The acid gas (CO2: 45%, CO: 28.2%, H2: 25%, AIR: 0.3%, CH4: 0.06%, H2S: 1.44%) from the evaporation hot water tower of the gasification device is generally discharged to the flare for combustion purification and emptying after cooling and dehumidification by the heat exchanger. Analysis found that the effective gas (H2 and CO) content in the acid gas is as high as 53%, and the acid gas volume is about 550m 3 / h. When the methanol synthesis system is reacting to produce methanol, due to the accumulation of inert gases in the system, it is necessary to release the inert gases in the system through the purge gas. The purge gas composition is: (CO2: 5.3%, CO: 7.7%, H2: 66%, O2+Ar: 0.73%, CH4: 4.4%, N2: 15.87%). In order to recover the hydrogen in the purge gas, the hydrogen is recovered by the hydrogen recovery system through the permeable membrane and returned to the system to continue to participate in the reaction. The tail gas rich in inert gases (CO2: 5.8%, CO: 20.5%, H2: 17.7%, O2+Ar: 1.6%, CH4: 10.35%, N2: 44.01%) is sent to the torch for combustion purification and emptying. The tail gas volume is about 1500m3□ / h, and the tail gas contains a large amount of combustible gas.

[0004] Whether it is a gasification unit or a methanol synthesis unit, a large amount of waste gas will be generated during the production process. These gases contain a certain amount of combustible gas. The direct discharge of these combustible gases will not only cause a large amount of energy waste and environmental pollution, but also pose a safety hazard. Therefore, a comprehensive waste gas utilization system is urgently needed to process the above gases and recover the energy in the gases. Utility Model Content

[0005] The purpose of the utility model is to provide a comprehensive utilization system of high calorific value waste gas from a methanol production plant, thereby solving the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A comprehensive utilization system of high calorific value waste gas from a methanol production plant comprises a gasification section flare, a synthesis section flare, a hydrogen recovery system, a sulfur recovery system and a boiler; the evaporation hot water tower of the gasification device is connected to the sulfur recovery system and the gasification section flare; the methanol synthesis device is connected to the hydrogen recovery system, and the hydrogen recovery system is connected to the sulfur recovery system, the boiler and the synthesis section flare.

[0008] Preferably, the evaporation hot water tower of the gasification device is connected to the gasification torch via an acid gas combustion pipeline, the acid gas combustion pipeline is connected to an acid gas recovery pipeline, and the acid gas recovery pipeline is connected to the sulfur recovery system;

[0009] The acid gas combustion pipeline is provided with a front stop valve, a combustion pressure self-regulating valve and a rear stop valve in sequence along the internal gas flow direction; the acid gas recovery pipeline is connected between the acid gas pressure self-regulating valve and the rear stop valve, and the acid gas recovery pipeline is provided with a recovery pressure self-regulating valve.

[0010] Preferably, the gasification device comprises a gasification device A, a gasification device B and a gasification device C;

[0011] The evaporation hot water tower of the gasification device A is connected to the A# gasification torch via the A# acid gas combustion pipeline, the A# acid gas combustion pipeline is connected to the A# acid gas recovery pipeline, and the A# acid gas recovery pipeline is connected to the sulfur recovery system; the A# acid gas combustion pipeline is provided with an A# front stop valve F1, an A# combustion pressure self-regulating valve F2 and an A# rear stop valve F3 in sequence along the internal gas flow direction; the A# acid gas recovery pipeline is connected between the A# combustion pressure self-regulating valve F2 and the A# rear stop valve F3, and the A# acid gas recovery pipeline is provided with an A# recovery pressure self-regulating valve F4;

[0012] The evaporation hot water tower of the gasification device B is connected to the B# gasification torch via the B# acid gas combustion pipeline, and the B# acid gas combustion pipeline is connected to the B# acid gas recovery pipeline, and the B# acid gas recovery pipeline is connected to the sulfur recovery system; the B# acid gas combustion pipeline is provided with a B# front stop valve F1', a B# combustion pressure self-regulating valve F2' and a B# rear stop valve F3' in sequence along the internal gas flow direction; the B# acid gas recovery pipeline is connected between the B# combustion pressure self-regulating valve F2' and the C# rear stop valve F3', and the B# acid gas recovery pipeline is provided with a B# recovery pressure self-regulating valve F4';

[0013] The evaporation hot water tower of the gasification device C is connected to the C# gasification torch via the C# acid gas combustion pipeline, and the C# acid gas combustion pipeline is connected to the C# acid gas recovery pipeline, and the C# acid gas recovery pipeline is connected to the sulfur recovery system; the C# acid gas combustion pipeline is provided with a C# front stop valve F1", a C# combustion pressure self-regulating valve F2" and a C# rear stop valve F3" in sequence along the internal gas flow direction; the C# acid gas recovery pipeline is connected between the C# combustion pressure self-regulating valve F2" and the C# rear stop valve F3", and the C# acid gas recovery pipeline is provided with a C# recovery pressure self-regulating valve F4".

[0014] Preferably, the sulfur recovery system comprises a sulfur recovery combustion furnace, a sulfur recovery Claus system and a sulfur recovery incinerator which are sequentially connected in series; the sulfur recovery combustion furnace is connected to an acid gas recovery pipeline.

[0015] Preferably, the sulfur recovery incinerator is connected to a purification system.

[0016] Preferably, the methanol synthesis unit is connected to the hydrogen recovery system via a hydrogen recovery pipeline and a hydrogen-rich gas recovery pipeline, respectively; the hydrogen recovery system is connected to the synthesis section flare, the sulfur recovery combustion furnace, the sulfur recovery incinerator and the boiler via a first tail gas recovery pipeline, a second tail gas recovery pipeline, a third tail gas recovery pipeline and a fourth tail gas recovery pipeline, respectively; the first tail gas recovery pipeline, the second tail gas recovery pipeline, the third tail gas recovery pipeline and the fourth tail gas recovery pipeline are respectively provided with a first tail gas pressure self-regulating valve F9, a second tail gas pressure self-regulating valve F10, a third tail gas pressure self-regulating valve F11 and a fourth tail gas pressure self-regulating valve F12.

[0017] Preferably, the fourth tail gas recovery pipeline is connected to the boiler via a boiler connecting pipeline, and a boiler pressure self-regulating valve is provided on the boiler connecting pipeline.

[0018] Preferably, the boiler includes a 1# boiler, a 2# boiler and a 3# boiler, and the 1# boiler, the 2# boiler and the 3# boiler are respectively connected to the fourth tail gas recovery pipeline via the 1# boiler connecting pipeline, the 2# boiler connecting pipeline and the 3# boiler connecting pipeline, and the 1# boiler connecting pipeline, the 2# boiler connecting pipeline and the 3# boiler connecting pipeline are respectively provided with a boiler pressure self-regulating valve F13, a boiler pressure self-regulating valve F14 and a boiler pressure self-regulating valve F15.

[0019] Preferably, the methanol synthesis unit is connected to the hydrogen recovery system via a hydrogen recovery pipeline and a hydrogen-rich gas recovery pipeline, respectively, and a hydrogen pressure self-regulating valve and a hydrogen-rich gas pressure self-regulating valve are provided on the hydrogen recovery pipeline and the hydrogen-rich gas recovery pipeline, respectively.

[0020] Preferably, the methanol synthesis device comprises a methanol synthesis phase I device and a methanol synthesis phase II device;

[0021] The first-phase methanol synthesis device is connected to the hydrogen recovery system via the first-phase #hydrogen recovery pipeline and the first-phase #hydrogen-rich gas recovery pipeline; the first-phase #hydrogen recovery pipeline and the first-phase #hydrogen-rich gas recovery pipeline are respectively provided with a first-phase hydrogen pressure self-regulating valve F5 and a first-phase hydrogen-rich gas self-regulating valve F7;

[0022] The methanol synthesis phase II device is connected to the hydrogen recovery system via the phase II #hydrogen recovery pipeline and the phase II #hydrogen-rich gas recovery pipeline; the phase II #hydrogen recovery pipeline and the phase II #hydrogen-rich gas recovery pipeline are respectively provided with a phase II hydrogen pressure self-regulating valve F6 and a phase II hydrogen-rich gas self-regulating valve F8.

[0023] The beneficial effects of the utility model are as follows: 1. The acid gas generated in the gasification device is transported to the sulfur recovery system for co-combustion, making full use of the calorific value of the combustible gas in the acid gas, producing steam as a by-product, and realizing the recovery and utilization of the high calorific value gas in the acid gas. The H2S in the acid gas participates in the reaction to produce sulfur, avoiding environmental pollution. 2. The relaxation gas output from the methanol synthesis device is recycled by the hydrogen recovery system, and the recovered hydrogen returns to the methanol synthesis device to participate in the reaction to generate methanol, realizing the recovery and utilization of hydrogen. The recovered tail gas is transported to the sulfur recovery system for co-combustion and transported to the boiler for combustion, making full use of the calorific value of the combustible gas in the tail gas, producing steam as a by-product, and realizing the recovery and utilization of the high calorific value gas in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the exhaust gas comprehensive utilization system in the embodiment of the utility model. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0026] In the present embodiment, a comprehensive utilization system of high calorific value waste gas from a methanol production plant is provided, including a gasification section flare, a synthesis section flare, a hydrogen recovery system, a sulfur recovery system and a boiler; the evaporation hot water tower of the gasification device is connected to the sulfur recovery system and the gasification section flare; the methanol synthesis device is connected to the hydrogen recovery system, and the hydrogen recovery system is connected to the sulfur recovery system, the boiler and the synthesis section flare.

[0027] The acid gas (CO2: 45%, CO: 28.2%, H2: 25%, AIR: 0.3%, CH4: 0.06%, H2S: 1.44%) flashed out from the evaporation hot water tower of the gasification device is transported to the sulfur recovery system for blending and combustion, making full use of the calorific value of the combustible gas in the acid gas and producing steam as a by-product. It can also make the H2S in the acid gas participate in the reaction to produce sulfur and avoid environmental pollution.

[0028] The hydrogen in the purge gas (CO2: 5.3%, CO: 7.7%, H2: 66%, O2+Ar: 0.73%, CH4: 4.4%, N2: 15.87%) discharged from the methanol synthesis unit is sent to the hydrogen recovery system for recycling, the recovered hydrogen-rich gas is returned to the methanol synthesis unit to continue to participate in the reaction, and the inert gas-rich tail gas generated by the recovered hydrogen (CO2: 5.8%, CO: 20.5%, H2: 17.7%, O2+Ar: 1.6%, CH4: 10.35%, N2: 44.01%) is respectively transported to the sulfur recovery system and the boiler for recycling again, and the remaining gas is transported to the synthesis section flare through a pressure control valve.

[0029] The sulfur recovery system will blend the incoming acid gas and tail gas for combustion, recover the high calorific value gas for heat utilization, and realize the recovery and utilization of sulfur.

[0030] The boiler burns the exhaust gas to provide steam for production of related equipment in the factory.

[0031] In this embodiment, the evaporation hot water tower of the gasification device is connected to the gasification torch via an acid gas combustion pipeline, and the acid gas combustion pipeline is connected to an acid gas recovery pipeline, and the acid gas recovery pipeline is connected to the sulfur recovery system;

[0032] The acid gas combustion pipeline is provided with a front stop valve, a combustion pressure self-regulating valve and a rear stop valve in sequence along the internal gas flow direction; the acid gas recovery pipeline is connected between the acid gas pressure self-regulating valve and the rear stop valve, and the acid gas recovery pipeline is provided with a recovery pressure self-regulating valve.

[0033] During the production process, the acid gas flashed out from the evaporation hot water tower of the gasification device enters the sulfur recovery system through the front stop valve, combustion pressure self-regulating valve and recovery pressure self-regulating valve for combustion and recovery, making full use of the calorific value of the combustible gas in the acid gas, recovering sulfur and avoiding environmental pollution caused by direct emissions.

[0034] See attached Figure 1 Specifically, the gasification device includes three sets, namely gasification device A, gasification device B and gasification device C. During operation, two are in operation and one is in standby.

[0035] The evaporation hot water tower of the gasification device A is connected to the A# gasification torch via the A# acid gas combustion pipeline, the A# acid gas combustion pipeline is connected to the A# acid gas recovery pipeline, and the A# acid gas recovery pipeline is connected to the sulfur recovery system; the A# acid gas combustion pipeline is provided with an A# front stop valve F1, an A# combustion pressure self-regulating valve F2 and an A# rear stop valve F3 in sequence along the internal gas flow direction; the A# acid gas recovery pipeline is connected between the A# combustion pressure self-regulating valve F2 and the A# rear stop valve F3, and the A# acid gas recovery pipeline is provided with an A# recovery pressure self-regulating valve F4;

[0036] The evaporation hot water tower of the gasification device B is connected to the B# gasification torch via the B# acid gas combustion pipeline, and the B# acid gas combustion pipeline is connected to the B# acid gas recovery pipeline, and the B# acid gas recovery pipeline is connected to the sulfur recovery system; the B# acid gas combustion pipeline is provided with a B# front stop valve F1', a B# combustion pressure self-regulating valve F2' and a B# rear stop valve F3' in sequence along the internal gas flow direction; the B# acid gas recovery pipeline is connected between the B# combustion pressure self-regulating valve F2' and the C# rear stop valve F3', and the B# acid gas recovery pipeline is provided with a B# recovery pressure self-regulating valve F4';

[0037] The evaporation hot water tower of the gasification device C is connected to the C# gasification torch via the C# acid gas combustion pipeline, and the C# acid gas combustion pipeline is connected to the C# acid gas recovery pipeline, and the C# acid gas recovery pipeline is connected to the sulfur recovery system; the C# acid gas combustion pipeline is provided with a C# front stop valve F1", a C# combustion pressure self-regulating valve F2" and a C# rear stop valve F3" in sequence along the internal gas flow direction; the C# acid gas recovery pipeline is connected between the C# combustion pressure self-regulating valve F2" and the C# rear stop valve F3", and the C# acid gas recovery pipeline is provided with a C# recovery pressure self-regulating valve F4".

[0038] See attached Figure 1 In this embodiment, the sulfur recovery system includes a sulfur recovery combustion furnace, a sulfur recovery Claus system and a sulfur recovery incinerator connected in series; the sulfur recovery combustion furnace is connected to the acid gas recovery pipeline. The sulfur recovery system converts the acid gas into sulfur through the sulfur recovery combustion furnace and the sulfur recovery Claus system, and the remaining gas is processed by the sulfur recovery incinerator and then sent to the purification system, and finally meets the emission standards.

[0039] The methanol synthesis unit is connected to the hydrogen recovery system via a hydrogen recovery pipeline and a hydrogen-rich gas recovery pipeline, respectively; the hydrogen recovery system is connected to the synthesis section flare, the sulfur recovery combustion furnace, the sulfur recovery incinerator and the boiler via a first tail gas recovery pipeline, a second tail gas recovery pipeline, a third tail gas recovery pipeline and a fourth tail gas recovery pipeline, respectively; the first tail gas recovery pipeline, the second tail gas recovery pipeline, the third tail gas recovery pipeline and the fourth tail gas recovery pipeline are respectively provided with a first tail gas pressure self-regulating valve F9, a second tail gas pressure self-regulating valve F10, a third tail gas pressure self-regulating valve F11 and a fourth tail gas pressure self-regulating valve F12.

[0040] The hydrogen recovery system is based on the principle of membrane separation. It recovers hydrogen according to the different permeation rates of the gas. The recovered hydrogen-rich gas returns to the methanol synthesis system to continue to participate in the reaction and generate methanol. Part of the tail gas rich in inert gas is sent to the sulfur recovery combustion furnace as a combustion-supporting gas after pressure regulation by the second tail gas pressure self-regulating valve F10, and produces steam as a by-product. Part of it is sent to the sulfur recovery incinerator through the third tail gas pressure self-regulating valve F11 as the main fuel gas for combustion, producing steam as a by-product and generating economic benefits. Part of it is sent to the boiler through the fourth tail gas pressure self-regulating valve F12 for combustion and emission. The tail gas not discharged in the pipeline is sent to the synthesis part flare for combustion and emission through the first tail gas pressure self-regulating valve F9.

[0041] In this embodiment, the fourth tail gas recovery pipeline is connected to the boiler via a boiler connecting pipeline, and a boiler pressure self-regulating valve is provided on the boiler connecting pipeline. The boiler pressure self-regulating valve can control the gas volume distribution, ensure that the boiler is in an efficient operation state, effectively burn the combustible gas, recover heat, and generate steam required for factory production.

[0042] See attached Figure 1 Specifically, the boilers include 1# boiler, 2# boiler and 3# boiler, two of which are in operation and one is in standby. The 1# boiler, 2# boiler and 3# boiler are connected to the fourth tail gas recovery pipeline through the 1# boiler connecting pipeline, the 2# boiler connecting pipeline and the 3# boiler connecting pipeline respectively, and the 1# boiler connecting pipeline, the 2# boiler connecting pipeline and the 3# boiler connecting pipeline are respectively provided with a boiler pressure self-regulating valve F13, a boiler pressure self-regulating valve F14 and a boiler pressure self-regulating valve F15.

[0043] In this embodiment, the methanol synthesis device is connected to the hydrogen recovery system via a hydrogen recovery pipeline and a hydrogen-rich gas recovery pipeline, respectively. A hydrogen pressure self-regulating valve and a hydrogen-rich gas pressure self-regulating valve are respectively provided on the hydrogen recovery pipeline and the hydrogen-rich gas recovery pipeline.

[0044] The purge gas output from the methanol synthesis unit is sent to the hydrogen recovery system for hydrogen recovery after being pressure-regulated by a hydrogen pressure self-regulating valve. The recovered hydrogen-rich gas is pressure-regulated by a hydrogen-rich pressure regulating valve and then sent back to the methanol synthesis unit to participate in the reaction and produce methanol.

[0045] See attached Figure 1 Specifically, the methanol synthesis device includes two sets of devices, namely a methanol synthesis phase I device and a methanol synthesis phase II device, and the methanol synthesis phase I device and the methanol synthesis phase II device are operated in parallel.

[0046] The first-phase methanol synthesis device is connected to the hydrogen recovery system via the first-phase #hydrogen recovery pipeline and the first-phase #hydrogen-rich gas recovery pipeline; the first-phase #hydrogen recovery pipeline and the first-phase #hydrogen-rich gas recovery pipeline are respectively provided with a first-phase hydrogen pressure self-regulating valve F5 and a first-phase hydrogen-rich gas self-regulating valve F7;

[0047] The methanol synthesis phase II device is connected to the hydrogen recovery system via the phase II #hydrogen recovery pipeline and the phase II #hydrogen-rich gas recovery pipeline; the phase II #hydrogen recovery pipeline and the phase II #hydrogen-rich gas recovery pipeline are respectively provided with a phase II hydrogen pressure self-regulating valve F6 and a phase II hydrogen-rich gas self-regulating valve F8.

[0048] By adopting the above technical solution disclosed in the utility model, the following beneficial effects are obtained:

[0049] The utility model provides a comprehensive utilization system of high calorific value waste gas in a methanol production plant. The acid gas generated in the gasification device is transported to the sulfur recovery system for blending and combustion, so that the calorific value of the combustible gas in the acid gas is fully utilized, steam is produced as a by-product, and the high calorific value gas in the acid gas is recycled. H2S in the acid gas participates in the reaction to produce sulfur, thereby avoiding environmental pollution. The purge gas output from the methanol synthesis device is recycled by the hydrogen recovery system, and the recycled hydrogen is returned to the methanol synthesis device to participate in the reaction again to generate methanol, thereby realizing hydrogen recycling. The recovered tail gas is transported to the sulfur recovery system for blending and combustion, and then transported to the boiler for combustion, so that the calorific value of the combustible gas in the tail gas is fully utilized, steam is produced as a by-product, and the high calorific value gas in the waste gas is recycled.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A comprehensive utilization system of high calorific value waste gas from a methanol production plant, characterized by: It includes a gasification torch, a synthesis torch, a hydrogen recovery system, a sulfur recovery system and a boiler; the evaporation hot water tower of the gasification device is connected to the sulfur recovery system and the gasification torch; the methanol synthesis device is connected to the hydrogen recovery system, and the hydrogen recovery system is connected to the sulfur recovery system, the boiler and the synthesis torch.

2. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 1 is characterized by: The evaporation hot water tower of the gasification device is connected to the gasification torch via an acid gas combustion pipeline, the acid gas combustion pipeline is connected to an acid gas recovery pipeline, and the acid gas recovery pipeline is connected to a sulfur recovery system; The acid gas combustion pipeline is provided with a front stop valve, a combustion pressure self-regulating valve and a rear stop valve in sequence along the internal gas flow direction; the acid gas recovery pipeline is connected between the acid gas pressure self-regulating valve and the rear stop valve, and the acid gas recovery pipeline is provided with a recovery pressure self-regulating valve.

3. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 2 is characterized by: The gasification device includes a gasification device A, a gasification device B and a gasification device C; The evaporation hot water tower of the gasification device A is connected to the A# gasification torch via the A# acid gas combustion pipeline, the A# acid gas combustion pipeline is connected to the A# acid gas recovery pipeline, and the A# acid gas recovery pipeline is connected to the sulfur recovery system; the A# acid gas combustion pipeline is provided with an A# front stop valve F1, an A# combustion pressure self-regulating valve F2 and an A# rear stop valve F3 in sequence along the internal gas flow direction; the A# acid gas recovery pipeline is connected between the A# combustion pressure self-regulating valve F2 and the A# rear stop valve F3, and the A# acid gas recovery pipeline is provided with an A# recovery pressure self-regulating valve F4; The evaporation hot water tower of the gasification device B is connected to the B# gasification torch via the B# acid gas combustion pipeline, and the B# acid gas combustion pipeline is connected to the B# acid gas recovery pipeline, and the B# acid gas recovery pipeline is connected to the sulfur recovery system; the B# acid gas combustion pipeline is provided with a B# front stop valve F1', a B# combustion pressure self-regulating valve F2' and a B# rear stop valve F3' in sequence along the internal gas flow direction; the B# acid gas recovery pipeline is connected between the B# combustion pressure self-regulating valve F2' and the C# rear stop valve F3', and the B# acid gas recovery pipeline is provided with a B# recovery pressure self-regulating valve F4'; The evaporation hot water tower of the gasification device C is connected to the C# gasification torch via the C# acid gas combustion pipeline, and the C# acid gas combustion pipeline is connected to the C# acid gas recovery pipeline, and the C# acid gas recovery pipeline is connected to the sulfur recovery system; the C# acid gas combustion pipeline is provided with a C# front stop valve F1", a C# combustion pressure self-regulating valve F2" and a C# rear stop valve F3" in sequence along the internal gas flow direction; the C# acid gas recovery pipeline is connected between the C# combustion pressure self-regulating valve F2" and the C# rear stop valve F3", and the C# acid gas recovery pipeline is provided with a C# recovery pressure self-regulating valve F4".

4. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 1 is characterized by: The sulfur recovery system comprises a sulfur recovery combustion furnace, a sulfur recovery Claus system and a sulfur recovery incinerator which are sequentially connected in series; the sulfur recovery combustion furnace is connected to an acid gas recovery pipeline.

5. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 4 is characterized by: The sulfur recovery incinerator is connected to the purification system.

6. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 4 is characterized by: The methanol synthesis unit is connected to the hydrogen recovery system via a hydrogen recovery pipeline and a hydrogen-rich gas recovery pipeline, respectively; the hydrogen recovery system is connected to the synthesis section flare, the sulfur recovery combustion furnace, the sulfur recovery incinerator and the boiler via a first tail gas recovery pipeline, a second tail gas recovery pipeline, a third tail gas recovery pipeline and a fourth tail gas recovery pipeline, respectively; the first tail gas recovery pipeline, the second tail gas recovery pipeline, the third tail gas recovery pipeline and the fourth tail gas recovery pipeline are respectively provided with a first tail gas pressure self-regulating valve F9, a second tail gas pressure self-regulating valve F10, a third tail gas pressure self-regulating valve F11 and a fourth tail gas pressure self-regulating valve F12.

7. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 6 is characterized by: The fourth tail gas recovery pipeline is connected to the boiler via a boiler connecting pipeline, and a boiler pressure self-regulating valve is provided on the boiler connecting pipeline.

8. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 7 is characterized by: The boilers include 1# boiler, 2# boiler and 3# boiler, and the 1# boiler, 2# boiler and 3# boiler are respectively connected to the fourth tail gas recovery pipeline through the 1# boiler connecting pipeline, the 2# boiler connecting pipeline and the 3# boiler connecting pipeline, and the 1# boiler connecting pipeline, the 2# boiler connecting pipeline and the 3# boiler connecting pipeline are respectively provided with a boiler pressure self-regulating valve F13, a boiler pressure self-regulating valve F14 and a boiler pressure self-regulating valve F15.

9. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 1, characterized in that: The methanol synthesis device is connected to the hydrogen recovery system via a hydrogen recovery pipeline and a hydrogen-rich gas recovery pipeline, respectively. A hydrogen pressure self-regulating valve and a hydrogen-rich gas pressure self-regulating valve are respectively provided on the hydrogen recovery pipeline and the hydrogen-rich gas recovery pipeline.

10. The comprehensive utilization system of high calorific value waste gas from a methanol production plant according to claim 9, characterized in that: The methanol synthesis device comprises a methanol synthesis phase I device and a methanol synthesis phase II device; The first-phase methanol synthesis device is connected to the hydrogen recovery system via the first-phase #hydrogen recovery pipeline and the first-phase #hydrogen-rich gas recovery pipeline; the first-phase #hydrogen recovery pipeline and the first-phase #hydrogen-rich gas recovery pipeline are respectively provided with a first-phase hydrogen pressure self-regulating valve F5 and a first-phase hydrogen-rich gas self-regulating valve F7; The methanol synthesis phase II device is connected to the hydrogen recovery system via the phase II #hydrogen recovery pipeline and the phase II #hydrogen-rich gas recovery pipeline; the phase II #hydrogen recovery pipeline and the phase II #hydrogen-rich gas recovery pipeline are respectively provided with a phase II hydrogen pressure self-regulating valve F6 and a phase II hydrogen-rich gas self-regulating valve F8.

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