Method and device for producing syngas in the process of smelting by a biomass-CO2 coupled converter

Abstract

The present invention provides a method and device for producing syngas in the process of biomass-CO2 coupled converter smelting. The method includes the following steps: When the converter starts smelting, main blowing is carried out, and at the same time, biomass and carrier gas are blown; After 5-90 s from the start of converter smelting, the main blowing is increased from 60% of the designed flow rate to 100%, the carrier gas is blown at a preset flow rate and remains unchanged, and when the O2 concentration of the syngas ≤ 1%, the biomass is blown at a preset flow rate; In the middle decarburization stage, the main blowing flow rate is reduced, and the biomass blowing flow rate value is increased to the maximum; After the end of the decarburization peak period, the main blowing flow rate is increased, and the biomass blowing flow rate and the carrier gas blowing flow rate are reduced; At the end of converter smelting, the main blowing flow rate is continuously increased, and the biomass blowing flow rate and the carrier gas blowing flow rate are further reduced. The method of the present invention achieves a biomass-CO2 conversion efficiency of more than 90%.

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 syngas in a biomass-CO2 coupled converter smelting process, comprising the following steps:

[0009] The converter starts smelting, with main blowing, and simultaneously blowing of biomass and carrier gas. The main blowing is O2 or an O2-CO2 mixture, and is blown at 60% of the designed flow rate. The carrier gas is blown at the designed flow rate.

[0010] After 5 - 90 s from the start of converter smelting, the main blowing is increased from 60% of the designed flow rate to 100%, the carrier gas is blown at a preset flow rate and remains unchanged. When the O2 concentration in the syngas ≤ 1%, the biomass is blown at a preset flow rate.

[0011] In the middle decarburization stage, the main blowing flow rate is reduced, the biomass blowing flow rate value is increased to the maximum, and the blowing flow rates of CO2 carrier gas and biomass are dynamically adjusted to maintain the powder gas ratio of the biomass blowing flow rate to the carrier gas blowing flow rate between 1 and 10.

[0012] After the end of the decarburization peak period, the main blowing flow rate is increased, and the biomass blowing flow rate and the carrier gas blowing flow rate are reduced.

[0013] At the end of converter smelting, the main blowing flow rate is continuously increased, and the biomass blowing flow rate and the carrier gas blowing flow rate are further reduced. After reaching more than 90% of the total smelting duration, the biomass blowing is stopped to obtain syngas.

[0014] The solution of the present invention is to realize the efficient conversion of syngas by blowing a certain amount of biomass and carrier gas in the original converter steelmaking process. The composition of the syngas obtained by the original process is: 40 - 50% CO, 20% - 40% CO2, and the rest is nitrogen. After adopting the solution of the present invention, the total syngas output increases by 20 - 30%, and the concentration of CO in the syngas increases by 5 - 15%. Finally, the composition of the syngas is realized as: 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 the converter smelting, the silicon-manganese content is high and the temperature is relatively low. Therefore, the oxygen flow rate needs to be increased to react the silicon-manganese first, so the injection amount of biomass powder is relatively low at this time. After the reactions of silicon and manganese are completed, the carbon reaction is ready to start. So when it reaches the intermediate decarburization stage and the temperature is relatively high, 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. Then, after the end of the decarburization peak period, the biomass injection amount is gradually reduced. Finally, at the end stage, when it reaches more than 90% of the total smelting time, the biomass injection can be stopped. The amount of syngas obtained increases throughout the process, and the concentration of CO contained in it also increases. At this time, the amount of the main blowing gas can be increased at the end stage to strengthen the stirring.

[0016] Of course, in the whole process, in addition to paying attention to the adjustment of the injection amount of the main blowing gas and the injection amounts of biomass and carrier gas, an important index that also needs to be noted is the powder-gas ratio of the biomass injection flow rate and the carrier gas injection flow rate. The powder-gas ratio needs to be adjusted in a timely manner at different stages. The powder-gas ratio not only takes into account its matching degree with the specific reaction at each stage, but also needs to consider the matching between the biomass injection flow rate and the carrier gas injection flow rate. Because if the injection amount of biomass powder is too large, it is easy to cause blockage, and if the injection amount of biomass powder is too small, the conversion cannot reach the total amount required in the reaction. Therefore, it is necessary to control an appropriate powder-gas ratio. Under the condition of controlling a certain biomass injection flow rate, the carrier gas is adjusted to an appropriate flow rate by controlling the powder-gas ratio. In actual calculation, the carrier gas is marked by volume concentration, and the biomass powder is marked by mass concentration. Therefore, when calculating specifically, the units of the two need to be unified before calculating the powder-gas ratio.

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

[0018] Since the amount of syngas increases after the reaction ends, the amount of syngas finally obtained is calculated using the following formula:

[0019] Let M g represent the mass flow rate of syngas:

[0020]

[0021] In the formula, Mg — Mass flow rate of syngas, kg / h; ε — Powder-gas ratio; Q CO2 — Total amount of CO2 gas, Nm3 / h; ρ CO2 — Density of CO2 gas, kg / m3; η CO2 — CO2 reaction rate, %; M z — Mass flow rate of pyrolysis gas of different types of biomass, kg / h.

[0022] In the following specific embodiments, there are dry smelting and wet smelting. Under the condition of dry gas recovery of coal gas, when the oxygen concentration in the syngas components is ≤ 2%, it is a low-oxygen condition; under the condition of wet gas recovery of coal gas, when the oxygen concentration in the syngas components is ≤ 5%, it is a low-oxygen condition.

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

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

[0025] The present invention also provides a device for producing syngas by the method of producing syngas in the above-mentioned biomass-CO2 coupled converter smelting process, including: a syngas lance, and the syngas lance extends into the converter; the syngas lance includes a main blowing channel for main blowing, and a biomass channel for blowing biomass and carrier gas, the biomass channel is connected to a biomass injection hole, and the main blowing channel is connected to a main injection hole.

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

[0027] Preferably, as a further feasible solution, the vertical distance between the outlet of the biomass injection hole and the outlet of the main injection hole is 0 - 3 m. It can also be 0.5 m, 1 m, 2 m, 2.5 m, etc.

[0028] The position of the main injection hole is generally unchanged. Then, when adjusting the position of the biomass injection hole, it needs to be controlled within a certain range. Because if the position of the biomass injection hole is too low, the biomass powder may be sprayed into the molten steel and fail to play its due role, so the injection port cannot be too low. If it is too high, it will affect the materials of the furnace body itself, and the flue gas concentration is also too high and difficult to control. Therefore, it is best that the sprayed biomass powder can react in a relatively large space. Therefore, the distance between the two injection holes needs to be controlled.

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

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

[0031] Preferably, as a further feasible solution, the syngas lance is communicated with an oxygen system through an oxygen channel.

[0032] Preferably, as a further feasible solution, it further includes a syngas component analyzer, and the syngas component analyzer is used to control the operation gun position and blowing parameters of the syngas lance.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] (1) Based on the total amount of syngas 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, and measures the quality of the biomass pyrolysis gas, so as to realize the dynamic control of the coordinated production of the required syngas by biomass-CO2 coupling and metallurgical waste heat.

[0035] (2) The present invention utilizes the high-temperature and low-oxygen environment in the converter during the converter smelting process to efficiently realize the coordinated conversion of biomass and CO2, generating high-calorific value syngas and chemical raw materials. Compared with the traditional coal-based syngas production, it reduces a large amount of energy consumed by external heat sources, does not require new large-scale equipment, and cleverly combines the zero-carbon raw material biomass and the industrial waste gas CO2 during the converter smelting process, realizing the high-value utilization of CO2 and the efficient conversion of biomass, which can provide assistance for the development of low-carbon technologies 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-chemical co-production. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0037] Figure 1 It is a schematic structural diagram of the biomass-CO2 coupling converter smelting syngas production device according to Embodiment 1 of the present invention;

[0038] Figure 2 It is a specific structural diagram of the syngas lance in the biomass-CO2 coupling converter smelting syngas production device according to Embodiment 1 of the present invention;

[0039] Figure 3 The figure shows the variation of the blowing flow rates of the carrier gas, biomass, and main blowing gas in the biomass-CO2 coupled converter smelting process for syngas production according to Embodiment 1 of the present invention.

[0040] In the figure, 1 - syngas lance, 2 - converter, 3 - oxygen system, 4 - oxygen channel, 5 - biomass carrier gas system, 6 - biomass blowing system, 7 - biomass blowing channel, 8 - blowing and smelting system, 9 - syngas component analyzer, 1-1 - main blowing channel, 1-2 - biomass channel, 1-3 - main injection hole, 1-4 - biomass injection hole. Detailed Embodiment

[0041] The following will describe the implementation of the present invention in detail in combination with embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. For those not specified in the embodiments, the operations are carried out under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments not specified by the manufacturer can be obtained as conventional products available on the market.

[0042] Embodiment 1

[0043] As Figure 1 shown, in this embodiment, the process is applied to 300t converter steelmaking. LT dry dust removal is used for gas recovery. The recovery amount of syngas (converter gas) is 128 Nm 3 / t steel, and the calorific value of the syngas is 1260 kcal / Nm 3 . The main blowing gas of the syngas lance 1 is O2, and the oxygen is transported through the oxygen channel 4 by the oxygen system 3. The designed flow rate is 62000 Nm 3 / h. The carrier gas in the biomass channel is CO2 with a concentration of 99.5%, and the designed flow rate is 8000 Nm 3 / h. The vertical distance between the outlet of the main injection hole 1-3 in the main blowing channel 1-1 and the outlet of the biomass injection hole 1-4 in the biomass channel 1-2 is 1.4 m. The specific structure diagram of the syngas lance is as Figure 2 shown. The biomass storage capacity of the biomass blowing system 6 is 4t. The syngas component analyzer 9 is of the laser detection type. During the smelting process, the data of the syngas component analyzer 9 is collected online to control the operation lance position and blowing parameters of the syngas lance 1, and dynamically adjust parameters such as the powder-gas ratio of biomass blowing. The biomass is carbonized pine biomass carbon powder with a calorific value of 3750 kcal / kg, a particle size of 50 mesh - 800 mesh, and a moisture content ≤ 30 wt%.

[0044] Within 90 s after the converter 2 starts smelting, the main blowing gas flow rate of the syngas lance 1 is increased from 60% of the designed flow rate to 100%, and the carrier gas in the biomass channel 1-2 remains at 7000 Nm 3With / h remaining unchanged, when the O2 concentration in the syngas shown by the syngas component analyzer is ≤1%, start the biomass injection system 6, open the control valve of the biomass injection system 6, and use the injection smelting system 8 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 via the biomass injection channel 7. Set the biomass injection mass flow rate to 230 kg / min, set the initial lance position of the lance to 2.5 m, and maintain the powder-gas ratio of biomass injection to carrier gas injection at 1.

[0045] When the converter smelting reaches the intermediate decarbonization stage for 5 - 10 min, adjust the main blowing O2 flow rate to 60000 Nm 3 / h, the carrier gas for the biomass channel is 6000 Nm 3 / h, the biomass injection mass flow rate is 295 kg / min, and the flow rate of the syngas converted from biomass-CO2 reaches the maximum value. According to the actual performance of converter smelting, dynamically adjust the injection flow rates of CO2 carrier gas and biomass, with an adjustment range of 5%, and maintain the average powder-gas ratio at 1.51 to achieve the rapid conversion of biomass-CO2 during the high-temperature decarbonization period.

[0046] When the decarbonization peak period of converter smelting ends, adjust the main blowing O2 flow rate to 63000 Nm 3 / h, the carrier gas for the biomass channel is 6500 Nm 3 / h, the biomass injection mass flow rate is 255 kg / min, maintain the powder-gas ratio of biomass injection to carrier gas injection at 1.2, and raise the operating lance position of the lance by 0.5 m. During this high-temperature stage, maintain the syngas output and biomass conversion efficiency.

[0047] At the end of the converter smelting period, dynamically adjust the main blowing O2 flow rate to 65000 Nm 3 / h, the carrier gas for the biomass channel is 5000 Nm 3 / h, the biomass injection mass flow rate is 180 kg / min, maintain the powder-gas ratio of biomass injection to carrier gas injection at 1.1. When reaching the 90% stage of the total smelting duration, based on the data of the syngas component analyzer 9, first close the biomass injection system, 6 then adjust the carrier gas for the biomass channel to 3000 Nm 3 / h, and lower the operating lance position of the syngas lance to 1.8 m from the molten bath surface to achieve stable control of the molten steel composition and temperature at the end point of converter smelting.

[0048] After reaching the converter smelting index, raise the syngas lance and tap the steel. At the same time, open the pressure relief device of the biomass injection system and start filling the biomass in preparation for the next furnace.

[0049] The total amount of biomass injected during the converter smelting process is 3200 kg, and the injection amount per ton of steel is 10.81 kg, achieving the conversion of 5376 Nm of industrial waste gas CO23 , the syngas production increases by 10750 Nm 3 , the CO concentration in the coal gas increases by 11.8%. The flow rate change diagrams of the carrier gas, main blowing gas, and biomass in the specific process are as shown in Figure 3 .

[0050] Example 2

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

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

[0053] When the converter smelting reaches the mid - stage decarburization stage, the main blowing O2 - CO2 flow rate (with 11% CO2 mixed) is adjusted to 26000 Nm 3 / h, the biomass injection mass flow rate is 170 kg / min, the gun position of the spray gun is lowered to 1.9 m. Based on the state of the converter smelting slag and flue gas overflow, the biomass injection flow rate is adjusted with an adjustment range of 5% to maintain a powder - gas ratio of 1.2, achieving the maximum degree of CO2 conversion.

[0054] When the converter smelting decarburization peak period ends, the main blowing O2 - CO2 flow rate (with 8% CO2 mixed) is adjusted to 27000 Nm 3 / h, maintaining a powder - gas ratio of 1.1, and the biomass injection mass flow rate is 145 kg / min, achieving an increase in the total amount of syngas.

[0055] At the end of the converter smelting, the main blowing O2 flow rate is dynamically adjusted to 30000 Nm 3 / h, the mass flow rate of biomass injection is 100 kg / min, and the powder-gas ratio of biomass injection to carrier gas injection is maintained at 0.9. When reaching 95% of the smelting duration, first close the biomass injection system, then adjust the carrier gas in the biomass channel to N2, with a flow rate of 1000 Nm 3 / h, and lower the operating lance position of the nozzle of the syngas lance from the molten bath surface to 1.5 m to achieve stable control of the molten steel composition and temperature at the end of converter smelting.

[0056] After reaching the converter smelting index, lift the syngas lance and tap the steel. At the same time, open the pressure relief device of the biomass injection system and start filling the biomass for use in the next furnace.

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

[0058] Example 3

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

[0060] 10 s after the converter starts smelting, the main blowing gas flow rate of the syngas lance reaches 23000 Nm 3 / h, lower the operating lance position of the nozzle of the syngas lance to 1.5 m from the molten bath surface, start the biomass injection system, set the biomass injection mass flow rate to 180 kg / min, dynamically adjust the biomass injection flow rate according to the furnace mouth flame state, maintain the powder-gas ratio at 1.5, and regulate the flow rate of the carrier gas in the biomass channel according to the powder-gas ratio.

[0061] During the mid-term decarburization stage of converter steelmaking, adjust the main blowing O2 flow rate to 20000 Nm 3 / h, the biomass injection mass flow rate is 230 kg / min, raise the lance position of the lance to 1.8 m, adjust the biomass injection flow rate based on the overflow state of the converter slag and flue gas, with an adjustment range of 5%, and maintain the powder-gas ratio at 1.7.

[0062] At the end of the decarburization peak period of converter steelmaking, adjust the main blowing O2 flow rate to 22000 Nm 3 / h, the biomass injection mass flow rate is 170 kg / min, and maintain the powder-gas ratio at 1.4.

[0063] At the end stage of converter steelmaking, dynamically adjust the main blowing O2 flow rate to 25000 Nm 3 / h, the biomass injection mass flow rate is 140 kg / min, and maintain the powder-gas ratio at 1.0. When reaching the 95% stage of the smelting duration, first close the biomass injection system, then adjust the carrier gas in the biomass channel to 1000 Nm 3 / h, lower the lance position of the lance to 1.2 m to achieve stable control of the molten steel composition and temperature at the end point of converter steelmaking.

[0064] After reaching the converter steelmaking index, raise the syngas lance and tap the steel. At the same time, open the pressure relief device of the biomass injection system and start filling biomass for use in the next furnace.

[0065] The total amount of biomass injected during converter steelmaking is 2130 kg, and the injection amount per ton of steel is 20.3 kg, achieving the conversion of 2386 Nm of industrial waste gas CO2 3 , and the syngas production increases by 4458 Nm 3 .

[0066] Although the present invention has been illustrated and described with reference to specific embodiments, it should be realized that many other changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, this means that all such changes and modifications falling within the scope of the present invention are included 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 the carrier gas are injected at the same time, the main blowing gas is O2 or O2-CO2 mixed gas, and is injected at 60% of the designed flow rate, and the carrier gas is injected at the designed flow rate, and the carrier gas includes CO2; 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 design flow rate and remains unchanged. When the O2 concentration of the synthesis gas is ≤1%, the biomass is injected at the design flow rate. During the smelting process, the powder-gas ratio of the biomass injection flow rate to the carrier gas injection flow rate is maintained at 0.5-1.5; In the mid-term decarbonization stage, the main blowing flow rate is reduced, the biomass injection flow rate is increased to a maximum value, and the injection flow rates of the 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 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.

3. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 1, characterized in that: 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.

4. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 1, characterized in that: The device used in the method for producing synthesis gas in the biomass-CO2 coupled converter smelting process includes: 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 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.

5. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 4, characterized in that: The vertical distance between the biomass spray hole outlet and the main spray hole outlet is 0-3m.

6. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 4, 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.

7. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 6, 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.

8. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 4, characterized in that: The synthesis gas injection gun is connected to the oxygen system through an oxygen channel.

9. The method for producing synthesis gas by biomass-CO2 coupled converter smelting process according to claim 4, 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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