Method and device for preparing synthesis gas in biomass-CO2 coupling converter smelting process

Abstract

The invention provides a method and a device for preparing synthesis gas in a biomass-CO2 coupled converter smelting process. The method comprises the following steps: starting smelting in a converter, blowing main blowing gas, and simultaneously blowing biomass and carrier gas; after the converter starts to smelt for 5-90 seconds, the main blowing gas is increased to 100% from 60% of the designed flow, the carrier gas is blown according to the preset flow and is kept unchanged, and when the O2 concentration of the synthesis gas is smaller than or equal to 1%, the biomass is blown according to the preset flow; in the middle-stage decarburization stage, the main blowing flow is reduced, and the biomass blowing flow value is increased to the maximum value; after the decarburization peak period is finished, the main blowing flow is increased, and the biomass blowing flow and the carrier gas blowing flow are reduced; and at the last stage of converter smelting, the main blowing flow continues to be increased, and the biomass blowing flow and the carrier gas blowing flow are further reduced. According to the method disclosed by the invention, the conversion efficiency of the biomass-CO2 reaches 90% or above.

Description

Technical Field

[0001] The present invention relates to the field of steel smelting, and in particular to a method and device for producing synthesis gas in a biomass-CO2 coupled converter smelting process. Background Art

[0002] CO2 emissions from the steel industry account for 15% of my country's total CO2 emissions, and the CO2 emission intensity of the "blast furnace-converter" long process smelting is about 2.0tCO2 / t steel. The converter smelting steelmaking process can produce a large amount of high calorific value coal gas, and the main components are CO2 and CO. CO can be used as a fuel to preheat cold materials in the converter, and CO2 can be used as top and bottom combined blowing gas for converter smelting to improve the quality of molten steel. Therefore, if CO2 can be used at a high value, it will not only reduce production energy consumption and production costs, but also improve the utilization rate of CO2.

[0003] The steel industry and the chemical industry themselves require a large amount of high-quality synthesis gas. The traditional coal-to-gas process requires a large amount of external heating energy to meet the high-temperature catalytic reaction of coal, which has low energy utilization efficiency and high energy consumption. Biomass, as a zero-carbon raw material, can replace coal to achieve high-quality synthesis gas production and conversion, which will also help reduce coal consumption and industrial carbon emissions. Therefore, how to achieve biomass-CO2 coupling and achieve the preparation of high-quality synthesis gas under low energy consumption conditions is a technical problem to be solved in the present invention.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The first purpose of the present invention is to provide a method for biomass-CO2 coupled converter smelting. Based on the zero-carbon properties of biomass and the high-temperature reaction characteristics of industrial waste gas CO2, the waste heat of biomass-CO2 coupled converter smelting flue gas is used to achieve efficient conversion of biomass-CO2 into high-value synthesis gas. By effectively controlling the operating steps and operating parameters in the entire method, the operation of preparing synthesis gas with low cost and low energy consumption is achieved. The biomass-CO2 conversion efficiency is over 90%, realizing the energy-saving and low-carbon coordinated utilization of zero-carbon raw material biomass and metallurgical waste gas CO2.

[0006] The second purpose of the present invention is to provide a device for biomass-CO2 coupled converter smelting, in which the biomass is sprayed into the converter through the synthesis gas injection gun channel, and the injection smelting system is dynamically controlled to couple the high-temperature waste heat of 1300℃-1700℃ in the converter smelting process, to complete the converter smelting and cheap preparation of synthesis gas in the high-temperature and low-oxygen environment of the converter.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] The present invention provides a method for producing synthesis gas by a biomass-CO2 coupled converter smelting process, comprising the following steps:

[0009] The converter starts smelting, the main blowing gas is injected, and the biomass and carrier gas are injected at the same time. The main blowing gas is O2 or O2-CO2 mixed gas, which is injected at 60% of the designed flow rate, and the carrier gas is injected at the designed flow rate;

[0010] 5-90s after the converter starts smelting, the main blowing gas is increased from 60% of the design flow rate to 100%, and the carrier gas is injected at the preset flow rate and remains unchanged. When the O2 concentration of the synthesis gas is ≤1%, the biomass is injected at the preset flow rate;

[0011] In the mid-term decarbonization stage, the main blowing flow rate is reduced, the biomass injection flow rate is increased to the maximum value, and the injection flow rates of CO2 carrier gas and biomass are dynamically adjusted to maintain the powder-gas ratio of biomass injection flow rate to carrier gas injection flow rate between 1-10;

[0012] After the decarbonization peak period is over, the main air flow rate is increased, and the biomass injection flow rate and the carrier gas injection flow rate are reduced;

[0013] At the end of converter smelting, the main blowing air flow rate is continued to be increased, and the biomass injection flow rate and the carrier gas injection flow rate are further reduced. After reaching more than 90% of the total smelting time, the biomass injection is stopped to obtain synthesis gas.

[0014] The scheme of the present invention is to realize efficient conversion of synthesis gas by spraying a certain amount of biomass and carrier gas in the original converter smelting process of molten steel. The composition of the synthesis gas obtained by the original process is: 40-50% CO, 20%-40% CO2, and the rest is nitrogen. After adopting the scheme of the present invention, the total synthesis gas output is increased by 20-30%, and the concentration of CO in the synthesis gas is increased by 5-15%. The final composition of the synthesis gas is: 50-60% CO, 20%-40% CO2, and the rest is nitrogen.

[0015] In the specific operation steps, the rule of biomass injection is that at the beginning of converter smelting, the silicon and manganese content is large and the temperature is relatively low, so it is necessary to increase the oxygen flow rate to complete the silicon and manganese reaction first, so the injection amount of biomass powder is low at this time, and then after the silicon and manganese react, they are ready to start the carbon reaction, so when it comes to the mid-term decarbonization stage, the temperature is also relatively high, and the mass flow rate of the injected biomass powder is adjusted to the maximum at this time. The purpose of increasing the flow rate is also to better carry out the carbon reaction, and then after the peak period of decarbonization ends, the biomass injection amount is gradually reduced. Finally, when it reaches more than 90% of the total smelting time at the end, the biomass injection can be stopped. The whole process achieves an increase in the amount of synthesis gas obtained and an increase in the concentration of CO contained therein. At this time, the amount of main blowing can be increased at the end of the period in order to strengthen stirring.

[0016] Of course, in the entire process, in addition to paying attention to the adjustment of the main gas injection volume, the injection volume of biomass and carrier gas, an important indicator that needs to be paid attention to is the powder-gas ratio of the biomass injection flow rate and the carrier gas injection flow rate. The powder-gas ratio at different stages also needs to be adjusted in time. In addition to considering the matching degree of each stage with the specific reaction, the powder-gas ratio also needs to consider the matching between the biomass injection flow rate and the carrier gas injection flow rate. Because if the biomass powder injection volume is too large, it is easy to cause blockage. If the biomass powder injection volume is too small, the conversion cannot reach the total amount required for the reaction. Therefore, it is necessary to control the appropriate powder-gas ratio. Under the condition of controlling a certain biomass injection flow rate, the carrier gas is adjusted to a suitable flow rate by controlling the powder-gas ratio. In actual calculations, the carrier gas is marked with volume concentration and the biomass powder is marked with mass concentration. Therefore, in specific calculations, the two need to be unified in units before calculating the powder-gas ratio.

[0017] Preferably, as a further feasible solution, 5-90s after the start of converter smelting, the powder-gas ratio is controlled at 0.5-1.5, such as 0.6, 0.8, 1.3, the powder-gas ratio in the mid-term decarburization stage is 1.2-1.7, such as 1.4, 1.5, 1.6, the powder-gas ratio after the decarburization peak period is 1.1-1.4, such as 1.2, 1.3, and the powder-gas ratio at the end of converter smelting is 0.8-1.2, such as 0.9, 1.0. It can be seen that for each stage, it is necessary to control the powder-gas ratio within a suitable range to achieve a good conversion effect.

[0018] Since the amount of synthesis gas is increased after the reaction is completed, the final amount of synthesis gas is calculated using the following formula:

[0019] M g Expressing the synthesis gas mass flow rate:

[0020]

[0021] Where Mg —Synthesis gas mass flow rate, kg / h; ε—Powder-gas ratio; Q CO2 —Total amount of CO2 gas, Nm3 / h; ρ CO2 —CO2 gas density, kg / m3; η CO2 —CO2 reaction rate, %; M z —Mass flow rate of different types of biomass analysis gas, kg / h.

[0022] In the following specific embodiments, some adopt dry smelting and some adopt wet smelting. Under the condition of dry gas recovery, the oxygen concentration in the synthesis gas component is ≤2% which is the low oxygen condition; under the condition of wet gas recovery, the oxygen concentration in the synthesis gas component is ≤5% which is the low oxygen condition.

[0023] Preferably, as a further implementable solution, the carrier gas includes CO2, and the carrier gas medium is at least one or more of N2, Ar, CO2, and O2.

[0024] Preferably, as a further feasible solution, the biomass is a biomass raw material or carbonized biomass, with a particle size of 50-800 mesh, a moisture content of ≤30wt%, and a calorific value of 500-6000kcal / kg. Relatively fine biomass particles can improve the quality of the injection and achieve better fusion with the carrier gas.

[0025] The present invention also provides a device for producing synthesis gas in the above-mentioned method for producing synthesis gas in the biomass-CO2 coupled converter smelting process, comprising: a synthesis gas spray gun, which extends into the converter; the synthesis gas spray gun includes a main blowing channel for main blowing gas injection, and a biomass channel for injecting biomass and carrier gas, the biomass channel is connected to the biomass spray hole, and the main blowing channel is connected to the main spray hole.

[0026] Preferably, the nominal capacity of the converter used is between 30-450t.

[0027] Preferably, as a further feasible solution, the vertical distance between the biomass spray hole outlet and the main spray hole outlet is 0-3m, or may be 0.5m, 1m, 2m, 2.5m, etc.

[0028] The position of the main nozzle is generally unchanged, so when adjusting the position of the biomass nozzle, it is necessary to control it within a certain range. If the position of the biomass nozzle is too low, the biomass powder may be sprayed into the molten steel and fail to play its due role. Therefore, the nozzle cannot be too low. If it is too high, it will affect the material of the furnace body itself, and the flue gas concentration will be too high and difficult to control. Therefore, it is best for the sprayed biomass powder to react in a relatively large space. Therefore, it is necessary to control the distance between the two nozzles.

[0029] Preferably, as a further implementable solution, it includes a biomass gas carrier system, and a biomass blowing system connected to the biomass gas carrier system through a biomass injection channel, and the biomass blowing system is connected to the synthesis gas lance.

[0030] Preferably, as a further feasible solution, it also includes a blowing smelting system for setting the blowing parameters of the biomass carrier gas system and the biomass blowing system.

[0031] Preferably, as a further feasible solution, the synthesis gas lance is connected to an oxygen system through an oxygen channel.

[0032] Preferably, as a further implementable solution, a synthesis gas component measuring instrument is also included, and the synthesis gas component measuring instrument is used to control the operating gun position and injection parameters of the synthesis gas spray gun.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) Based on the total amount of synthesis gas required by the process requirements and the converter smelting conditions, the present invention sets parameters such as the biomass injection flow rate and the powder-gas ratio, measures the quality of the biomass analysis gas, and realizes dynamic control of the biomass-CO2 coupling metallurgical waste heat to synergistically produce the required synthesis gas.

[0035] (2) The present invention utilizes the high temperature and low oxygen environment in the converter during the converter smelting process to efficiently achieve the synergistic conversion of biomass and CO2 to generate high calorific value synthesis gas and chemical raw materials. Compared with the traditional coal-based synthesis gas, it reduces the large amount of energy consumed by the external heat source, does not require the addition of large-scale equipment, and cleverly combines zero-carbon raw material biomass with industrial waste gas CO2 in the converter smelting process, achieving high-value utilization of CO2 and efficient conversion of biomass, which can provide support for the development of low-carbon technology in the steel industry. At the same time, it also provides a new process for the preparation of cheap raw material gas in the chemical industry, promoting the coordinated carbon reduction of steel production. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0037] Figure 1 This is a schematic structural diagram of a biomass-CO2 coupled converter smelting synthesis gas production device according to Example 1 of the present invention;

[0038] Figure 2 This is a schematic diagram of the specific structure of the synthesis gas lance in the biomass-CO2 coupled converter smelting synthesis gas production device of Example 1 of the present invention;

[0039] Figure 3 This is a diagram showing the changes in the injection flow rates of the carrier gas, biomass and main blowing gas in the method for producing synthesis gas by biomass-CO2 coupled converter smelting according to Example 1 of the present invention.

[0040] In the figure, 1-synthesis gas spray gun, 2-converter, 3-oxygen system, 4-oxygen channel, 5-biomass carrier gas system, 6-biomass blowing system, 7-biomass injection channel, 8-injection smelting system, 9-synthesis gas component measuring instrument, 1-1-main blowing channel, 1-2-biomass channel, 1-3-main spray hole, 1-4-biomass spray hole. DETAILED DESCRIPTION

[0041] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0042] Example 1

[0043] like Figure 1 As shown in the figure, in this embodiment, the process is applied to 300t converter steelmaking, the gas recovery adopts LT dry dust removal, and the recovery amount of synthesis gas (converter gas) is 128Nm 3 / t steel, calorific value of synthesis gas 1260kcal / Nm 3 The main blowing gas of the synthesis gas spray gun 1 is O2, and the oxygen is transported through the oxygen system 3 through the oxygen channel 4, and the design flow rate is 62000Nm 3 / h, the carrier gas in the biomass channel is CO2, the concentration is 99.5%, and the design flow rate is 8000Nm 3 / h, the vertical distance between the outlet of the main spray hole 1-3 of the main blowing channel 1-1 and the outlet of the biomass spray hole 1-4 of the biomass channel 1-2 is 1.4m. The specific structure diagram of the syngas spray gun is as follows Figure 2 As shown, the biomass storage capacity of the biomass injection system 6 is 4t, the synthesis gas component measuring instrument 9 is of laser detection type, the data of the synthesis gas component measuring instrument 9 is collected online during the smelting process, the operating gun position and injection parameters of the synthesis gas spray gun 1 are controlled, and the powder-gas ratio and other parameters of the biomass injection are dynamically adjusted. The biomass is carbonized pine biomass carbon powder, the calorific value is 3750kcal / kg, the particle size is 50 mesh-800 mesh, and the moisture content is ≤30wt%.

[0044] Within 90 seconds after converter 2 started smelting, the main blowing flow rate of syngas lance 1 was increased from 60% of the designed flow rate to 100%, and the carrier gas of biomass channel 1-2 was maintained at 7000Nm 3 / h remains unchanged, based on the fact that the synthesis gas component measuring instrument shows that the synthesis gas O2 concentration is ≤1%, the biomass injection system 6 is started, the control valve of the biomass injection system 6 is opened, and the injection smelting system 8 is used to set the injection parameters of the biomass carrier gas system 5 and the biomass injection system 6. The injection medium is CO2 and biomass. The biomass is transported through the biomass carrier gas system 5 through the biomass injection channel 7. The biomass injection mass flow rate is set to 230kg / min, and the initial gun position of the spray gun is set to 2.5m. The powder-gas ratio of biomass injection and carrier gas injection is maintained at 1.

[0045] The converter smelting reaches the mid-term decarburization stage for 5-10 minutes, and the main blowing O2 flow rate is adjusted to 60000Nm 3 / h, the carrier gas in the biomass channel is 6000Nm 3 / h, the biomass injection mass flow rate is 295kg / min, and the biomass-CO2 conversion synthesis gas flow rate reaches the maximum value. According to the converter smelting performance, the injection flow rates of CO2 carrier gas and biomass are dynamically adjusted with an adjustment range of 5%, maintaining an average powder-gas ratio of 1.51, thereby achieving rapid biomass-CO2 conversion during the high-temperature period of decarbonization.

[0046] The peak period of converter smelting and decarburization has ended, and the main blowing O2 flow rate is adjusted to 63000Nm 3 / h, the carrier gas in the biomass channel is 6500Nm 3 / h, the biomass injection mass flow rate is 255kg / min, the powder-gas ratio of biomass injection and carrier gas injection is maintained at 1.2, and the spray gun operating position is raised by 0.5m. This high temperature stage maintains the synthesis gas output and biomass conversion efficiency.

[0047] At the end of converter smelting, the main O2 flow rate is dynamically adjusted to 65000Nm 3 / h, the carrier gas in the biomass channel is 5000Nm 3 / h, the biomass injection mass flow rate is 180kg / min, and the powder-gas ratio of biomass injection to carrier gas injection is maintained at 1.1. When the total smelting time reaches 90%, based on the data of the synthesis gas component measuring instrument 9, the biomass injection system is first closed, and then the carrier gas of the biomass channel is adjusted to 3000Nm 3 / h, the distance between the nozzle of the synthesis gas spray gun and the liquid surface of the molten pool is reduced to 1.8m, so as to achieve stable control of the composition and temperature of the molten steel at the end of converter smelting.

[0048] After reaching the converter smelting index, the synthesis gas injection gun is raised and steel is tapped. At the same time, the pressure relief device of the biomass injection system is opened, and biomass is started to be filled in preparation for the next furnace.

[0049] The total amount of biomass injected during the converter smelting process is 3200kg, and the injection amount per ton of steel is 10.81kg, achieving a CO2 conversion of 5376Nm3 , Syngas production increased by 10750Nm 3 , the CO concentration of coal gas increased by 11.8%. The flow rate changes of carrier gas, main blowing gas and biomass in the specific process are shown in the figure below: Figure 3 shown.

[0050] Example 2

[0051] In this embodiment, the process is applied to 120t converter steelmaking, the steel grade is HRB400, the coal gas recovery adopts OG wet dust removal, the CO content of the synthesis gas is 42.8%, and the recovery amount of synthesis gas (converter coal gas) is 144Nm 3 / t steel. The biomass is carbonized coconut shell biomass carbon powder, with a calorific value of 3920kcal / kg, a particle size of 50-800 mesh, a moisture content of ≤30wt%, and a vertical distance of 0.6m between the main nozzle outlet of the syngas spray gun and the biomass nozzle outlet. The main blowing gas is O2-CO2, and the designed total flow rate is 28000Nm 3 / h, the carrier gas of the biomass channel is N2-CO2, and the designed flow rate is 4000Nm 3 / h, the biomass storage capacity of the biomass injection system is 3t, the syngas component analyzer is of infrared detection type, the data of the syngas component analyzer is collected online during the smelting process, the operating gun position and injection parameters of the syngas spray gun are controlled, and the powder-to-gas ratio and other parameters of the biomass injection are dynamically adjusted.

[0052] Within 5 seconds after the start of smelting in the converter, the main O2-CO2 flow rate (CO2 mixed with 5%) of the synthesis gas spray gun reaches 100%, and the biomass injection system is started, the control valve of the biomass injection system is opened, the biomass injection mass flow rate is set to 120kg / min, and the initial gun position of the spray gun is set to 1.7m. According to the flame state of the furnace mouth, the biomass injection flow rate is dynamically adjusted to maintain the powder-gas ratio of 0.8, and the flow rate of the biomass channel carrier gas is regulated according to the powder-gas ratio.

[0053] The converter smelting reaches the mid-term decarburization stage, and the main blowing O2-CO2 flow rate (CO2 mixed 11%) is adjusted to 26000Nm 3 / h, the biomass injection mass flow rate is 170kg / min, the spray gun position is lowered to 1.9m, and based on the converter smelting slag and flue gas overflow status, the biomass injection flow rate is adjusted by 5%, maintaining the powder-gas ratio of 1.2 to achieve maximum CO2 conversion.

[0054] The peak period of converter smelting and decarburization has ended, and the main blowing O2-CO2 flow rate (CO2 mixed 8%) is adjusted to 27000Nm 3 / h, maintaining the powder-gas ratio at 1.1 and the biomass injection mass flow rate at 145kg / min, thus increasing the total amount of synthesis gas.

[0055] At the end of converter smelting, the main O2 flow rate is dynamically adjusted to 30000Nm 3 / h, the biomass injection mass flow rate is 100kg / min, and the powder-gas ratio of biomass injection and carrier gas injection is maintained at 0.9. When the smelting time reaches 95%, the biomass injection system is first turned off, and then the carrier gas in the biomass channel is adjusted to N2 with a flow rate of 1000Nm 3 / h, the distance between the nozzle of the synthesis gas spray gun and the liquid surface of the molten pool is reduced to 1.5m, so as to achieve stable control of the composition and temperature of the molten steel at the end of converter smelting.

[0056] After reaching the converter smelting index, the synthesis gas injection gun is raised and steel is tapped. At the same time, the pressure relief device of the biomass injection system is opened, and biomass is started to be filled in preparation for the next furnace.

[0057] The total amount of biomass injected during the converter smelting process is 1550kg, and the injection amount per ton of steel is 12.4kg, achieving a CO2 conversion of 2459Nm2 in industrial waste gas 3 , Syngas production increased by 4920Nm 3 , the recovery of synthesis gas increased by 21.6%.

[0058] Example 3

[0059] In this embodiment, the process is applied to 100t converter steelmaking, the gas recovery adopts OG wet dust removal, the CO content of the gas is 43%, and the recovery amount of synthesis gas (converter gas) is 135Nm 3 / t steel. The biomass is the original biomass of corn stalks. To ensure the fluidity of the powder, 30% carbonized coconut shell biomass carbon powder is mixed in. The calorific value is 2040kcal / kg. The vertical distance between the main nozzle outlet of the syngas spray gun and the biomass nozzle outlet is 0.5m. The main blowing gas is O2, and the designed total flow rate is 23000Nm 3 / h, the carrier gas of the biomass channel is CO2, and the designed flow rate is 4000Nm 3 / h, the biomass storage capacity of the biomass injection system is 3t, and the syngas component analyzer is of infrared detection type. The syngas component analyzer data is collected online during the smelting process to control the operation gun position and injection parameters of the syngas spray gun, dynamically adjust the parameters such as the powder-gas ratio of the biomass injection, the particle size is 50-800 mesh, and the moisture content is ≤30wt%.

[0060] 10 seconds after the converter started smelting, the main gas flow rate of the synthesis gas spray gun reached 23000Nm 3 / h, the distance between the nozzle of the synthesis gas spray gun and the liquid surface of the molten pool is lowered to 1.5m, and the biomass injection system is started. The biomass injection mass flow rate is set to 180kg / min. According to the flame state of the furnace mouth, the biomass injection flow rate is dynamically adjusted to maintain the powder-gas ratio of 1.5, and the flow rate of the carrier gas in the biomass channel is regulated according to the powder-gas ratio.

[0061] The converter smelting reaches the mid-term decarburization stage, and the main blowing O2 flow rate is adjusted to 20000Nm 3 / h, the biomass injection mass flow rate is 230kg / min, the spray gun position is raised to 1.8m, and based on the converter smelting slag and flue gas overflow status, the biomass injection flow rate is adjusted by 5% to maintain the powder-gas ratio of 1.7.

[0062] The peak period of converter smelting and decarburization has ended, and the main blowing O2 flow rate is adjusted to 22000Nm 3 / h, the biomass injection mass flow rate is 170kg / min, and the powder-gas ratio is maintained at 1.4.

[0063] At the end of converter smelting, the main blowing O2 flow rate is dynamically adjusted to 25000Nm 3 / h, the biomass injection mass flow rate is 140kg / min, and the powder-gas ratio is maintained at 1.0. When the smelting time reaches 95%, the biomass injection system is first turned off, and then the carrier gas in the biomass channel is adjusted to 1000Nm 3 / h, the spray gun position is lowered to 1.2m, so as to achieve stable control of the composition and temperature of molten steel at the end of converter smelting.

[0064] After reaching the converter smelting index, the synthesis gas injection gun is raised and steel is tapped. At the same time, the pressure relief device of the biomass injection system is opened, and biomass is started to be filled in preparation for the next furnace.

[0065] The total amount of biomass injected during the converter smelting process is 2130kg, and the injection amount per ton of steel is 20.3kg, achieving a CO2 conversion of 2386Nm 3 , Syngas production increased by 4458Nm 3 .

[0066] Although the present invention has been illustrated and described with specific embodiments, it will be appreciated that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended to include all such changes and modifications within the scope of the present invention in the appended claims.

Claims

1. A method for producing synthesis gas by coupling a biomass-CO2 converter smelting process, characterized in that: The steps include: The converter starts smelting, the main blowing gas is injected, and the biomass and carrier gas are injected at the same time. The main blowing gas is O2 or O2-CO2 mixed gas, which is injected at 60% of the designed flow rate, and the carrier gas is injected at the designed flow rate; 5-90s after the converter starts smelting, the main blowing gas is increased from 60% of the design flow rate to 100%, and the carrier gas is injected at the preset flow rate and remains unchanged. When the O2 concentration of the synthesis gas is ≤1%, the biomass is injected at the preset flow rate, and the powder-gas ratio of the biomass injection flow rate to the carrier gas injection flow rate is maintained between 1-10 during the entire smelting process; In the mid-term decarbonization stage, the main blowing flow rate is reduced, the biomass injection flow rate is increased to the maximum value, and the injection flow rates of CO2 carrier gas and biomass are dynamically adjusted; After the decarbonization peak period is over, the main air flow rate is increased, and the biomass injection flow rate and the carrier gas injection flow rate are reduced; At the end of converter smelting, the main blowing air flow rate is continued to be increased, and the biomass injection flow rate and the carrier gas injection flow rate are further reduced. After reaching more than 90% of the total smelting time, the biomass injection is stopped to obtain synthesis gas.

2. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 1, characterized in that: The carrier gas includes CO2, and the carrier gas medium is at least one or more of N2, Ar, CO2, and O2.

3. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 1, characterized in that: The biomass is a biomass raw material or carbonized biomass, with a particle size of 50-800 meshes, a moisture content of ≤30wt%, and a calorific value of 500-6000kcal / kg.

4. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 1, characterized in that: 5-90s after the start of converter smelting, the powder-gas ratio is controlled at 0.5-1.5, the powder-gas ratio in the mid-term decarburization stage is 1.2-1.7, the powder-gas ratio after the peak decarburization period is 1.1-1.4, and the powder-gas ratio at the end of converter smelting is 0.8-1.

2.

5. A device for producing syngas using the method for producing syngas by biomass-CO2 coupled converter smelting process as described in any one of claims 1 to 4, characterized in that: include: A synthesis gas spray gun, the synthesis gas spray gun extends into the converter; the synthesis gas spray gun includes a main blowing channel for main blowing and a biomass channel for blowing biomass and carrier gas, the biomass channel is connected to the biomass spray hole, and the main blowing channel is connected to the main spray hole.

6. The device for producing synthesis gas according to claim 5, characterized in that: The vertical distance between the biomass spray hole outlet and the main spray hole outlet is 0-3m.

7. The device for producing synthesis gas according to claim 5, characterized in that: The invention comprises a biomass gas carrier system and a biomass blowing system connected with the biomass gas carrier system through a biomass blowing channel, wherein the biomass blowing system is connected with the synthesis gas spray gun.

8. The device for producing synthesis gas according to claim 7, characterized in that: The invention also comprises a blowing smelting system for setting the blowing parameters of the biomass carrier gas system and the biomass blowing system.

9. The device for producing synthesis gas according to claim 5, characterized in that: The synthesis gas injection gun is connected to the oxygen system through an oxygen channel.

10. The device for producing synthesis gas according to claim 5, characterized in that: It also includes a synthesis gas component measuring instrument, which is used to control the operating gun position and injection parameters of the synthesis gas spray gun.

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