Submerged arc furnace tail gas and new energy hydrogen production combined methanol production system

Abstract

The utility model discloses a methanol production system combining submerged arc furnace tail gas and new energy hydrogen production. The methanol production system comprises a new energy power generation unit, an electrolytic hydrogen production unit, a submerged arc furnace tail gas recovery unit, a methanol synthesis unit and a power distribution network. The water electrolysis hydrogen production device has the advantages that green electric power is provided for water electrolysis hydrogen production through wind power generation and photovoltaic power generation, and a hydrogen source is provided for methanol production; recycled submerged arc furnace tail gas rich in carbon and oxygen compounds is used for providing a carbon source for methanol production; after hydrogen and tail gas of the submerged arc furnace form mixed gas, methanol is synthesized under the action of a catalyst. According to the utility model, the tail gas of the submerged arc furnace is recovered to synthesize methanol with green hydrogen, so that the problem of recycling the tail gas of the submerged arc furnace is solved, the tail gas is turned into wealth, and the application scene and the utilization value of the tail gas of the submerged arc furnace are expanded; through power consumption of hydrogen production, a consumption scene is provided for new energy; through the adjustability and interruptability of the electrical load for electrolytic hydrogen production, a demand side adjustment means is added for a power grid.

Description

Technical field:

[0001] The utility model relates to a methanol preparation system, in particular to a methanol production system combining tail gas from a submerged arc furnace with hydrogen produced from new energy. Background technology:

[0002] During the production process of a fully enclosed submerged arc furnace, a large amount of submerged arc furnace gas is generated, and the carbon-oxygen compounds in the submerged arc furnace gas account for a large proportion. At present, in the production of submerged arc furnace enterprises, the submerged arc furnace gas is often directly discharged and released. Due to the high carbon-oxygen compound content and high toxicity of the submerged arc furnace gas, direct discharge not only causes energy waste, but also pollutes the environment, which is not conducive to energy conservation and environmental protection. Taking a silicon-manganese alloy submerged arc furnace as an example, the volume percentage of the gas composition of the submerged arc furnace tail gas is CO: 71%, H 2 : 6.7%, CO 2 :8.1%,CH 4 : 1.2%, O 2 : 1%, N2: 12%, and carbon oxides account for as much as 79%. Direct discharge into the atmosphere will cause serious environmental pollution and energy waste. High-proportion carbon oxides are an ideal carbon source for methanol synthesis.

[0003] Methanol is an important chemical product, and its usage is second only to benzene, ethylene and propylene. It has abundant downstream products, including formaldehyde, methyl tert-butyl ether, methyl methacrylate, acetic acid, and new uses such as direct fuel. With the development of society, methanol is likely to become an important alternative energy source. At present, the main raw materials for the production of methanol are coal and natural gas. A large amount of fossil energy will be consumed in the production process, which will inevitably cause environmental pollution.

[0004] Hydrogen energy storage is an important support for the large-scale development of smart grids and renewable energy power generation. Its preparation methods include coal-to-hydrogen, natural gas-to-hydrogen, water electrolysis and shale gas-to-hydrogen. Among them, the process of water electrolysis hydrogen production is simple and the hydrogen produced has the highest purity. It is a completely clean way to produce hydrogen, but the distribution network needs to provide electricity in the process of water electrolysis hydrogen production. At present, thermal power units account for a large proportion of my country's installed power capacity. Taking Inner Mongolia as an example, as of the end of 2022, the total installed capacity of various power sources in Inner Mongolia Autonomous Region is 169.15 million kilowatts, and the installed capacity of non-renewable energy is 104.92 million kilowatts, accounting for 62%. Therefore, if grid electricity is used, the source of electricity for water electrolysis hydrogen production is mainly fossil energy, which is not conducive to energy conservation and emission reduction. Utility model content:

[0005] The utility model aims to provide a system for producing methanol by combining ore-fired furnace tail gas with new energy hydrogen, which can recycle ore-fired furnace tail gas and provide hydrogen source for methanol production through wind power generation and photovoltaic power generation.

[0006] The utility model is implemented by the following technical scheme: a system for producing methanol by combining tail gas from an ore-fired furnace with hydrogen produced from new energy, comprising a new energy power generation unit, an electrolytic hydrogen production unit, an ore-fired furnace tail gas recovery unit, a methanol synthesis unit and a distribution network; the power output end of the photovoltaic power generation transformer of the new energy power generation unit and the power output end of the wind power generation transformer of the new energy power generation unit are both connected to the power input end of the distribution network; the power output end of the distribution network is connected to the power input end of the electrolytic hydrogen production transformer of the electrolytic hydrogen production unit; the exhaust port of the hydrogen storage tank of the electrolytic hydrogen production unit is connected to the hydrogen inlet of the mixer of the methanol synthesis unit through a pipeline; the exhaust port of the clean coal gas storage tank of the ore-fired furnace tail gas recovery unit is connected to the clean coal gas inlet of the mixer of the methanol synthesis unit through a pipeline.

[0007] Furthermore, the new energy power generation unit includes a wind turbine generator set and a photovoltaic generator set; the wind turbine generator set includes a wind turbine and the wind power transformer, and the power output end of the wind turbine is connected to the power input end of the wind power transformer; the photovoltaic generator set includes a photovoltaic component, an inverter and the photovoltaic power transformer connected in sequence.

[0008] Furthermore, the electrolytic hydrogen production unit includes the electrolytic hydrogen production transformer, a rectifier inverter, an alkali liquid storage tank, an electrolyzer, a first gas-liquid separator, a hydrogen storage tank, a second gas-liquid separator, and an oxygen storage tank; the power output end of the electrolytic hydrogen production transformer is connected to the power input end of the rectifier inverter, and the power output end of the rectifier inverter is connected to the power input end of the electrolyzer; the liquid outlet of the alkali liquid storage tank is connected to the electrolyte inlet of the electrolyzer, and the electrolyte outlet of the electrolyzer is connected to the liquid inlet of the alkali liquid storage tank; the cathode product outlet of the electrolyzer is connected to the air inlet of the first gas-liquid separator, and the exhaust port of the first gas-liquid separator is connected to the air inlet of the hydrogen storage tank; the anode product outlet of the electrolyzer is connected to the air inlet of the second gas-liquid separator, and the exhaust port of the second gas-liquid separator is connected to the air inlet of the oxygen storage tank.

[0009] Furthermore, the blast furnace tail gas recovery unit includes a blast furnace, a tail gas desulfurization purification system and the clean coal gas storage tank; the blast furnace tail gas outlet is connected to the air inlet of the tail gas desulfurization purification system; the exhaust port of the tail gas desulfurization purification system is connected to the air inlet of the clean coal gas storage tank.

[0010] Furthermore, the exhaust gas desulfurization purification system includes a gravity dust collector, a raw gas main, a bag dust collector, a clean gas main, a clean gas chamber and a desulfurization tower; the exhaust gas outlet of the electric arc furnace is connected to the exhaust gas inlet of the gravity dust collector through a pipeline, the exhaust port of the gravity dust collector is connected to the air inlet of the bag dust collector through the raw gas main, the exhaust port of the bag dust collector is connected to the air inlet of the clean gas chamber through the clean gas main; the exhaust port of the clean gas chamber is connected to the air inlet of the desulfurization tower through a pipeline; the exhaust port of the desulfurization tower is connected to the air inlet of the clean gas storage tank through a pipeline.

[0011] Furthermore, the methanol purification unit includes the mixer, preheater, methanol reactor, crude methanol condenser, separator, circulating compressor, crude methanol storage tank, and steam drum; the exhaust port of the mixer is connected to the cold medium inlet of the preheater, and the cold medium outlet of the preheater is connected to the air inlet of the methanol reactor; the crude methanol outlet of the methanol reactor is connected to the hot medium inlet of the preheater; the hot medium outlet of the preheater is connected to the inlet of the crude methanol condenser, the outlet of the crude methanol condenser is connected to the inlet of the separator, the air outlet of the separator is connected to the air inlet of the circulating compressor, and the air outlet of the circulating compressor is connected to the air inlet of the mixer; the liquid outlet of the separator is connected to the liquid inlet of the crude methanol storage tank; the steam outlet of the methanol reactor is connected to the steam inlet of the steam drum, and the liquid outlet of the steam drum is connected to the liquid inlet of the methanol reactor.

[0012] Advantages of the utility model:

[0013] The utility model adopts wind power generation and photovoltaic power generation to provide "green" electricity for water electrolysis and hydrogen production, and provides a hydrogen source for methanol production; by utilizing the recovered carbon oxide-rich ore furnace tail gas, a carbon source is provided for methanol production; after hydrogen and ore furnace tail gas form a mixed gas, methanol is synthesized under the action of a catalyst. The utility model recovers the ore furnace tail gas and then synthesizes methanol with "green hydrogen", which solves the problem of recycling and utilizing the ore furnace tail gas, turns the tail gas into treasure, and expands the application scenarios and utilization value of the ore furnace tail gas; through the electricity consumption of hydrogen production, a consumption scenario for new energy is provided; through the adjustability and interruptibility of the electricity load for hydrogen electrolysis, a demand-side regulation means is added to the power grid. Description of the drawings:

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the system flow of the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the process of tail gas desulfurization purification system.

[0017] In the figure: new energy power generation unit 1, photovoltaic module 1.1, inverter 1.2, photovoltaic power transformer 1.3, wind turbine 1.4, wind power transformer 1.5, electrolytic hydrogen production unit 2, electrolytic hydrogen production transformer 2.1, rectifier inverter 2.2, alkali liquid storage tank 2.3, electrolyzer 2.4, first gas-liquid separator 2.5, hydrogen storage tank 2.6, second gas-liquid separator 2.7, oxygen storage tank 2.8, submerged arc furnace tail gas recovery unit 3, submerged arc furnace 3.1, tail gas degassing Sulfur purification system 3.2, gravity dust collector 3.2.1, raw gas main 3.2.2, bag dust collector 3.2.3, clean gas main 3.2.4, clean gas chamber 3.2.5, desulfurization tower 3.2.6, clean gas storage tank 3.3, methanol synthesis unit 4, mixer 4.1, preheater 4.2, methanol synthesis reactor 4.3, crude methanol condenser 4.4, separator 4.5, circulating compressor 4.6, crude methanol storage tank 4.7, steam drum 4.8, distribution network 5. Specific implementation method:

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, the system for producing methanol by combining tail gas from an ore-fired furnace with hydrogen produced from new energy sources includes a new energy power generation unit 1, an electrolytic hydrogen production unit 2, a tail gas recovery unit for an ore-fired furnace 3, a methanol synthesis unit 4 and a distribution network 5.

[0020] The new energy power generation unit 1 includes a wind turbine generator set and a photovoltaic generator set; the wind turbine generator set includes a wind turbine generator 1.4 and a wind power transformer 1.5, and the power output end of the wind turbine generator 1.4 is connected to the power input end of the wind power transformer 1.5; the photovoltaic generator set includes a photovoltaic module 1.1, an inverter 1.2 and a photovoltaic transformer 1.3 connected in sequence.

[0021] The electrolytic hydrogen production unit 2 includes an electrolytic hydrogen production transformer 2.1, a rectifier inverter 2.2, an alkali liquid storage tank 2.3, an electrolyzer 2.4, a first gas-liquid separator 2.5, a hydrogen storage tank 2.6, a second gas-liquid separator 2.7, and an oxygen storage tank 2.8; the power output end of the electrolytic hydrogen production transformer 2.1 is connected to the power input end of the rectifier inverter 2.2, and the power output end of the rectifier inverter 2.2 is connected to the power input end of the electrolyzer 2.4; the liquid outlet of the alkali liquid storage tank 2.3 is connected to the electric power input end of the rectifier inverter 2.2; The electrolyte inlet of the electrolytic cell 2.4 is connected, the electrolyte outlet of the electrolytic cell 2.4 is connected to the liquid inlet of the alkali solution storage tank 2.3, the cathode product outlet of the electrolytic cell 2.4 is connected to the air inlet of the first gas-liquid separator 2.5, the anode product outlet of the electrolytic cell 2.4 is connected to the air inlet of the second gas-liquid separator 2.7, the air outlet of the first gas-liquid separator 2.5 is connected to the air inlet of the hydrogen storage tank 2.6, and the air outlet of the second gas-liquid separator 2.7 is connected to the air inlet of the oxygen storage tank 2.8.

[0022] The tail gas recovery unit 3 of the submerged arc furnace includes a submerged arc furnace 3.1, a tail gas desulfurization purification system 3.2, and a clean gas storage tank 3.3. The tail gas outlet of the submerged arc furnace 3.1 is connected to the tail gas desulfurization purification system 3.2; the outlet of the tail gas desulfurization purification system 3.2 is connected to the inlet of the clean gas storage tank 3.3. Figure 2 As shown, the tail gas desulfurization purification system 3.2 includes a gravity dust collector 3.2.1, a raw gas main 3.2.2, a bag dust collector 3.2.3, a clean gas main 3.2.4, a clean gas chamber 3.2.5 and a desulfurization tower 3.2.6; the tail gas outlet of the blast furnace 3.1 is connected to the tail gas inlet of the gravity dust collector 3.2.1 through a pipeline, the exhaust port of the gravity dust collector 3.2.1 is connected to the air inlet of the bag dust collector 3.2.3 through the raw gas main 3.2.2, the exhaust port of the bag dust collector 3.2.3 is connected to the air inlet of the clean gas chamber 3.2.5 through the clean gas main 3.2.4; the exhaust port of the clean gas chamber 3.2.5 is connected to the air inlet of the desulfurization tower 3.2.6 through a pipeline; the exhaust port of the desulfurization tower 3.2.6 is connected to the air inlet of the clean gas storage tank 3.3 through a pipeline.

[0023] The methanol synthesis unit 4 comprises a mixer 4.1, a preheater 4.2, a methanol synthesis reactor 4.3, a crude methanol condenser 4.4, a separator 4.5, a circulating compressor 4.6, a crude methanol storage tank 4.7, and a steam drum 4.8; the air inlet of the mixer 4.1 is divided into three paths, one of which is connected to the air outlet of the clean coal gas storage tank 3.3, one of which is connected to the air outlet of the hydrogen storage tank 2.6, and one of which is connected to the air outlet of the circulating compressor; the air outlet of the mixer 4.1 is connected to the cold medium inlet of the preheater 4.2, and the cold medium outlet of the preheater 4.2 is connected to the air inlet of the methanol synthesis reactor 4.3. The crude methanol outlet of the methanol reactor 4.3 is connected with the heat medium inlet of the preheater 4.2; the steam outlet of the methanol reactor 4.3 is connected with the steam inlet of the steam drum 4.8, and the liquid outlet of the steam drum 4.8 is connected with the liquid inlet of the methanol reactor 4.3; the heat medium outlet of the preheater 4.2 is connected with the inlet of the crude methanol condenser 4.4, the outlet of the crude methanol condenser 4.4 is connected with the inlet of the separator 4.5, and the air outlet of the separator 4.5 is connected with the air inlet of the circulating compressor 4.6; the liquid outlet of the separator 4.5 is connected with the liquid inlet of the crude methanol storage tank 4.7.

[0024] The power output end of the wind power transformer 1.5 of the new energy power generation unit 1 and the power output end of the photovoltaic power transformer 1.3 of the new energy power generation unit 1 are both connected to the power input end of the distribution network 5; the power output end of the distribution network 5 is connected to the power input end of the electrolysis hydrogen production transformer 2.1 of the electrolysis hydrogen production unit 2.

[0025] Working principle:

[0026] The new energy power generation unit 1 provides power to the electrolytic hydrogen production unit 2 through the distribution network 5, and adjusts the power consumption and the operating status of a single electrolyzer according to the dispatching information of the distribution network 5; the electrolytic hydrogen production unit 2 produces hydrogen and oxygen by electrolyzing water, and the hydrogen provides the hydrogen source required for methanol production for the methanol synthesis unit 4; the ore-fired furnace tail gas recovery unit 3 provides the methanol synthesis unit 4 with the carbon source required for methanol production.

[0027] In this embodiment, the electrolytic hydrogen production unit 2 adopts alkaline electrolysis. In addition to the alkaline electrolysis, solid polymer electrolyte electrolysis and high-temperature solid oxide electrolysis can also be used. In this embodiment, water is electrolyzed to produce hydrogen according to the alkaline electrolysis method. A high-concentration potassium hydroxide solution (25% to 30% aqueous solution) with high conductivity at a working temperature of 70 to 80°C is used as an electrolyte. Alkaline-resistant materials such as iron, nickel and nickel alloys with low overvoltage in electrode reactions are used as electrodes. The abandoned wind and photovoltaic power from the new energy power generation unit 1 is transformed by the electrolytic hydrogen production transformer 2.1 and then converted into direct current by the rectifier inverter 2.21.2. The direct current is passed into the electrolytic cell 2.4. When the direct current acts on the potassium hydroxide solution, electrolytic reactions occur at the cathode and anode of the electrolytic cell 2.4, respectively. H+ The ions are attracted by the cathode and move toward the cathode, accepting electrons and releasing hydrogen. The OH in the electrolyte - Attracted by the anode, it moves to the anode and finally releases electrons to become water and oxygen. The total reaction between the cathode and cathode is 2H 2 O=2H 2 +O 2 As the reaction proceeds, when the electrolyte concentration changes or the solution is consumed, the electrolyte in the electrolytic cell 2.4 is replenished by the alkali solution storage tank 2.3, and the hydrogen generated at the cathode is sent to the gas-liquid separator 2.5 through a pipeline, where the hydrogen is separated from water and sent to the hydrogen storage tank 2.6 for storage.

[0028] In this embodiment, the tail gas desulfurization purification system 3.2 of the tail gas recovery unit 3 of the blast furnace consists of two parts: dust removal and desulfurization. Dust removal can be carried out by a dry bag filter, which is mainly composed of a gravity dust collector, a raw gas main, a bag filter and a clean gas main. After the blast furnace gas is subjected to gravity dust removal, it is distributed to each box of the bag filter by the raw gas main and enters the raw gas chamber. The dust with larger particles naturally settles due to gravity and enters the ash hopper. The dust with smaller particles rises with the gas. When passing through the filter bag, the dust is retained on the outer surface of the filter bag, and the gas is purified. The purified gas enters the clean gas chamber for further desulfurization. The role of desulfurization is to remove impurities that are toxic to the methanol synthesis catalyst, such as sulfur-containing compounds. Even if the sulfur content in the raw gas is reduced to 1ppm, it has a significant toxic effect on the copper-based catalyst, thereby shortening its service life and also has a certain toxic effect on the zinc-based catalyst. After desulfurization, the sulfur content in the gas entering the methanol synthesis reactor 4.3 is required to be reduced to less than 0.2 ppm. There are generally two methods of desulfurization: wet method and dry method. The submerged arc furnace tail gas recovery unit 3 provides the methanol synthesis unit 4 with the carbon source required for methanol synthesis.

[0029] In this embodiment, the methanol synthesis unit 4 synthesizes methanol from the hydrogen from the electrolytic hydrogen production unit and the clean coal gas (carbon monoxide, carbon dioxide and hydrogen) from the tail gas recovery unit 3 of the submerged arc furnace under the action of a catalyst (copper-based catalyst). The clean coal gas, hydrogen and compressed circulating gas are mixed in the mixer 4.1, and then heated in the preheater 4.2 before entering the methanol synthesis reactor 4.3. The methanol synthesis reactor 4.3 is a shell-and-tube reactor, in which a methanol synthesis catalyst is installed, and the shell side is boiling hot water. The heat generated in the reaction is used to produce medium-pressure saturated steam.

[0030] In this embodiment, the gas exiting the methanol synthesis reactor 4.3 enters the preheater 4.2, which is a gas-to-gas heat exchanger, where it exchanges heat with the mixed gas from the mixer 4.1 to heat the raw gas entering the methanol synthesis reactor 4.3 to the catalyst activation temperature. The gas exiting the preheater 4.2 is cooled to 40°C by the circulating water of the crude methanol condenser, at which time most of the methanol and water vapor in the gas are condensed, and then the gas-liquid separation is carried out in the separator 4.5. The separated gas enters the circulating compressor 4.6, and after the pressure is increased, it is mixed with the raw gas to synthesize methanol for the next cycle; the separated liquid enters the crude methanol storage tank. When carbon monoxide is used to synthesize methanol, one carbon monoxide molecule and two hydrogen molecules generate one methanol molecule. Compared with carbon dioxide as a carbon source, the ratio of hydrogen molecules consumed to synthesize one methanol molecule is 3:2.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for producing methanol by combining tail gas from a submerged arc furnace with hydrogen produced from new energy sources, characterized in that: Including new energy power generation unit, electrolytic hydrogen production unit, submerged arc furnace tail gas recovery unit, methanol synthesis unit and distribution network; The power output end of the photovoltaic power generation transformer of the new energy power generation unit and the power output end of the wind power generation transformer of the new energy power generation unit are both connected to the power input end of the distribution network; the power output end of the distribution network is connected to the power input end of the electrolysis hydrogen production transformer of the electrolysis hydrogen production unit; the exhaust port of the hydrogen storage tank of the electrolysis hydrogen production unit is connected to the hydrogen inlet of the mixer of the methanol synthesis unit through a pipeline; the exhaust port of the clean coal gas storage tank of the blast furnace tail gas recovery unit is connected to the clean coal gas inlet of the mixer of the methanol synthesis unit through a pipeline.

2. The system for producing methanol by combining tail gas from a submerged arc furnace with hydrogen from new energy sources according to claim 1 is characterized in that: The new energy power generation unit includes a wind power generator set and a photovoltaic power generator set; the wind power generator set includes a wind generator and the wind power transformer, and the power output end of the wind generator is connected to the power input end of the wind power transformer; the photovoltaic power generator set includes a photovoltaic component, an inverter and the photovoltaic power transformer connected in sequence.

3. The system for producing methanol by combining tail gas from a submerged arc furnace with hydrogen from new energy sources according to claim 1 is characterized in that: The electrolytic hydrogen production unit includes the electrolytic hydrogen production transformer, a rectifier inverter, an alkali solution storage tank, an electrolytic cell, a first gas-liquid separator, a hydrogen storage tank, a second gas-liquid separator, and an oxygen storage tank; The power output end of the electrolysis hydrogen production transformer is connected to the power input end of the rectifier inverter, and the power output end of the rectifier inverter is connected to the power input end of the electrolyzer; The liquid outlet of the alkali solution storage tank is communicated with the electrolyte inlet of the electrolyzer, and the electrolyte outlet of the electrolyzer is communicated with the liquid inlet of the alkali solution storage tank; the cathode product outlet of the electrolyzer is communicated with the air inlet of the first gas-liquid separator, and the exhaust port of the first gas-liquid separator is communicated with the air inlet of the hydrogen storage tank; the anode product outlet of the electrolyzer is communicated with the air inlet of the second gas-liquid separator, and the exhaust port of the second gas-liquid separator is communicated with the air inlet of the oxygen storage tank.

4. The system for producing methanol by combining tail gas from a submerged arc furnace with hydrogen from new energy sources according to claim 1 is characterized in that: The tail gas recovery unit of the ore-fired furnace includes an ore-fired furnace, a tail gas desulfurization purification system and the clean coal gas storage tank; the tail gas outlet of the ore-fired furnace is connected to the air inlet of the tail gas desulfurization purification system; the exhaust port of the tail gas desulfurization purification system is connected to the air inlet of the clean coal gas storage tank.

5. The system for producing methanol by combining tail gas from a submerged arc furnace with hydrogen from new energy sources according to claim 4 is characterized in that: The exhaust gas desulfurization and purification system includes a gravity dust collector, a raw gas main, a bag dust collector, a clean gas main, a clean gas chamber and a desulfurization tower; the exhaust gas outlet of the electric arc furnace is connected to the exhaust gas inlet of the gravity dust collector through a pipeline, the exhaust port of the gravity dust collector is connected to the air inlet of the bag dust collector through the raw gas main, the exhaust port of the bag dust collector is connected to the air inlet of the clean gas chamber through the clean gas main; the exhaust port of the clean gas chamber is connected to the air inlet of the desulfurization tower through a pipeline; the exhaust port of the desulfurization tower is connected to the air inlet of the clean gas storage tank through a pipeline.

6. The system for producing methanol by combining tail gas from a submerged arc furnace with hydrogen from new energy sources according to claim 1 is characterized in that: The methanol purification unit includes the mixer, preheater, methanol reactor, crude methanol condenser, separator, circulation compressor, crude methanol storage tank, and steam drum; The exhaust port of the mixer is connected to the cold medium inlet of the preheater, and the cold medium outlet of the preheater is connected to the air inlet of the methanol reactor; the crude methanol outlet of the methanol reactor is connected to the hot medium inlet of the preheater; the hot medium outlet of the preheater is connected to the inlet of the crude methanol condenser, and the outlet of the crude methanol condenser is connected to the inlet of the separator, the air outlet of the separator is connected to the air inlet of the circulation compressor, and the air outlet of the circulation compressor is connected to the air inlet of the mixer; the liquid outlet of the separator is connected to the liquid inlet of the crude methanol storage tank; the steam outlet of the methanol reactor is connected to the steam inlet of the steam drum, and the liquid outlet of the steam drum is connected to the liquid inlet of the methanol reactor.

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