Biomass chemical synergistic coupling ironmaking production device and method

Abstract

The invention provides a biomass chemical engineering synergistic coupling ironmaking production device and method. The method comprises the steps that biomass raw materials are provided; converting the biomass raw material into a biomass chemical product and water pyrolytic carbon through a biomass treatment system; the water pyrolysis carbon is converted into deashing water pyrolysis biomass carbon through an intermediate treatment system, high-temperature and high-pressure saturated steam is generated, the deashing water pyrolysis biomass carbon is used for providing a heat generating agent and a reducing agent for blast furnace production, and the high-temperature and high-pressure saturated steam is used for providing heat for an acid water pyrolysis system; after the delimed water pyrolysis biomass charcoal is mixed with pulverized coal, molten iron and hot blast stove high-temperature waste gas are generated through an iron making treatment system, the molten iron is used for iron making, and the hot blast stove high-temperature waste gas is used for providing heat for a heat exchange system. According to the biomass chemical engineering synergistic coupling ironmaking production device and method, effective coupling connection of the biomass chemical industry and the iron and steel industry can be achieved.

Description

Technical Field

[0001] This application relates to the technical fields of biomass chemical engineering and iron and steel metallurgy production, and particularly relates to a device and method for biomass chemical engineering collaborative coupling ironmaking production. Background Art

[0002] China is a major agricultural production country. A large amount of agricultural residues are produced every year during agricultural production and agricultural product processing. In addition, there are also a large number of forestry residues in industries such as planned logging in forest factories, furniture manufacturing, wood packaging recycling, and garden pruning. How to improve the utilization value of agricultural and forestry residues is one of the important issues faced by China's social and economic development. Agricultural and forestry biomass is a functional supramolecule intertwined by cellulose, hemicellulose, lignin, etc. The multi-component structure determines the diversification of biomass chemical products using agricultural and forestry residues as raw materials. Currently, multiple industries such as energy, materials, feed, and substrates have been formed. Seeking green, low-carbon, and high-value conversion of agricultural and forestry residue resources through multiple channels has become a development trend. Biomass chemical industries such as pentose, xylose, and furfural have developed rapidly in China and are widely used in the production of plastic products, pharmaceuticals, agrochemicals, and various sugars. A large amount of solid waste such as pentose residue, xylose residue, and furfural residue will be generated during the production of xylose and furfural. How to utilize such solid waste with high value has become the main problem faced by the biomass chemical industry.

[0003] China is also a major steel production country, with an annual crude steel output exceeding 1 billion tons, accounting for more than 50% of the world's total crude steel output. A large amount of fossil fuels are consumed during steel production, and at the same time, it contributes about 15% of the total national industrial CO2 emissions. Reducing CO2 emissions in steel production is the key to achieving the national "dual carbon" strategic goal. Biomass has the property of carbon neutrality, and when it is applied to steel production, it will not release additional greenhouse gases into the atmosphere, which has important practical significance for reducing CO2 emissions in the steel industry. Currently, China's steel production mainly uses the long process of blast furnace-converter. A large amount of pulverized coal is used in the blast furnace production process to provide reducing agents and heating agents for the smelting process. Partially replacing pulverized coal with xylose residue and furfural residue in blast furnace injection production will effectively reduce the cost and CO2 emissions in the process of blast furnace ironmaking production.

[0004] By-products of acid hydrolysis of biomass chemical products such as pentose residue, xylose residue, and furfural residue have problems such as high ash content, high alkali metal potassium element content, and low calorific value. Direct application to blast furnace injection will have a serious negative impact on the stability, smooth operation, and safety of the blast furnace production process, resulting in serious deterioration of the economic and technical indicators of blast furnace production. How to remove harmful elements from acid hydrolysis biomass residues has become a common problem faced by the biomass chemical industry and the steel industry.

[0005] Therefore, a device and method for biomass chemical engineering collaborative coupling ironmaking production are needed. Summary of the Invention

[0006] To solve the above problems, the present application provides a device and method for the co-coupled ironmaking production of biomass chemical industry, which can realize the effective coupling and connection between the biomass chemical industry and the steel industry, and reduce production costs, fossil energy consumption and pollutant emissions.

[0007] The present application provides a device for the co-coupled ironmaking production of biomass chemical industry, comprising: a biomass treatment system, including a raw material pretreatment system, an acid hydrothermal pyrolysis system and a hydrolysis steam condensation system connected in sequence, for generating hydrothermal pyrolysis carbon and condensed waste liquid from biomass raw materials; an intermediate treatment system, including a wet grinding and deashing system, a solid-liquid separation system and a heat exchange system connected in sequence, the wet grinding and deashing system is respectively connected with the acid hydrothermal pyrolysis system and the hydrolysis steam condensation system, and the intermediate treatment system is used for generating deashed hydrothermal pyrolysis biomass carbon, potassium-rich organic waste liquid and high-temperature and high-pressure saturated steam from the hydrothermal pyrolysis carbon and the condensed waste liquid; an ironmaking treatment system, including a pulverized coal drying and pulverizing system, a pulverized coal injection system, a blast furnace body and a hot air system connected in sequence, the pulverized coal drying and pulverizing system is connected with the solid-liquid separation system, and the hot air system is connected with the heat exchange system for providing heat to the heat exchange system, and the ironmaking treatment system is used for generating molten iron and hot blast stove high-temperature waste gas from the deashed hydrothermal pyrolysis biomass carbon and the pulverized coal introduced from the outside.

[0008] The present application also provides a method for the co-coupled ironmaking production of biomass chemical industry, comprising the steps of: providing biomass raw materials; converting the biomass raw materials into biomass chemical products and hydrothermal pyrolysis carbon through the biomass treatment system; converting the hydrothermal pyrolysis carbon into deashed hydrothermal pyrolysis biomass carbon through the intermediate treatment system, and generating high-temperature and high-pressure saturated steam, wherein the deashed hydrothermal pyrolysis biomass carbon is used as a heating agent and a reducing agent for blast furnace production, and the high-temperature and high-pressure saturated steam is used as heat for the acid hydrothermal pyrolysis system; mixing the deashed hydrothermal pyrolysis biomass carbon with pulverized coal, and generating molten iron and hot blast stove high-temperature waste gas through the ironmaking treatment system, wherein the molten iron is used for ironmaking, and the hot blast stove high-temperature waste gas is used as heat for the heat exchange system.

[0009] Optionally, the step of converting the biomass raw materials into biomass chemical products and hydrothermal pyrolysis carbon through the biomass treatment system includes: crushing and screening the biomass raw materials through the raw material pretreatment system to remove impurities; performing acid hydrothermal pyrolysis on the biomass raw materials after removing impurities through the acid hydrothermal pyrolysis system to obtain hydrothermal pyrolysis carbon and the remaining part, and the acid hydrothermal pyrolysis system includes a dilute acid catalyst; converting the remaining part into biomass chemical products and condensed waste liquid through the hydrolysis steam condensation system.

[0010] Optionally, converting the hydrothermal carbon into deashed hydrothermal biochar by the intermediate treatment system and generating high-temperature and high-pressure saturated steam includes: performing wet grinding reaction on the hydrothermal carbon and the condensate waste liquid in a wet grinding and deashing system to obtain a mixed solution; feeding the mixed solution into a solid-liquid separation system to obtain deashed hydrothermal biochar and deashed waste liquid; feeding the deashed waste liquid into a heat exchange system to generate high-temperature and high-pressure saturated steam, low-temperature waste gas, and potassium-rich organic waste liquid.

[0011] Optionally, after mixing the deashed hydrothermal biochar with pulverized coal, generating molten iron and hot blast stove high-temperature waste gas through the ironmaking treatment system includes: feeding the deashed hydrothermal biochar into a pulverized coal drying and crushing system to dry, crush, and mix it with the pulverized coal introduced from the outside; through the pulverized coal injection system, feeding the mixed deashed hydrothermal biochar and pulverized coal into the blast furnace body for blast furnace production to generate molten iron and blast furnace gas; feeding the blast furnace gas and the outside air into a hot blast system to generate hot blast and hot blast stove high-temperature waste gas, wherein the hot blast is used for blast furnace production.

[0012] Optionally, the biomass raw material includes one or a mixture of multiple of corn cobs, agricultural straws, forestry residues, and food processing residues.

[0013] Optionally, crushing and screening the biomass raw material through the raw material pretreatment system to remove impurities includes: crushing the biomass raw material, and the particle size of the crushed biomass solid particles is less than 2 cm.

[0014] Optionally, the dilute acid catalyst includes one or a mixture of multiple of sulfuric acid, acetic acid, hydrochloric acid, nitric acid, Lewis acid, and citric acid.

[0015] Optionally, the acid hydrothermal system includes one or a combination of multiple of continuous high-pressure reaction kettles and batch high-pressure reaction kettles. The reaction temperature of the acid hydrothermal decomposition is 140 - 230 °C, the acid hydrothermal decomposition pressure is 0.3 - 2.8 MPa, the reaction time is 1 - 6 h, and the generated hydrothermal carbon includes one or a mixture of multiple of pentose residue, xylose residue, and furfural residue.

[0016] Optionally, the conditions of the wet grinding reaction include: the mass ratio of the hydrothermal carbon to the condensate waste liquid is 1:2 - 1:5, the wet grinding temperature is 5 - 85 °C, and the wet grinding time is 1 - 60 min.

[0017] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0018] The present application provides a device and method for the integrated production of biomass chemical engineering and ironmaking through the effective coupling and connection of the biomass chemical industry and the steel industry. Using the solid waste-based biomass carbon residue of biomass chemical enterprises as raw materials, biomass carbon products with metallurgical properties meeting the requirements of blast furnace ironmaking production are prepared. At the same time, the flue gas generated by the hot air system in the blast furnace production is used to provide heat for the biomass chemical industry, realizing the high-value utilization and low-cost production of solid waste in the biomass chemical industry, enhancing the market competitiveness of biomass chemical enterprises, and also enabling low-carbon and low-cost production in the ironmaking process, promoting the steel industry to achieve the strategic goals of carbon peak and carbon neutrality at an early date. The technical solution of the present application has the characteristics of strong raw material applicability, high production efficiency, low production cost, and low CO2 and pollutant emissions, and has positive economic and environmental significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a device for the integrated production of biomass chemical engineering and ironmaking in an embodiment of the present application;

[0021] Figure 2 It is a schematic flow diagram of a method for the integrated production of biomass chemical engineering and ironmaking in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will describe the preferred embodiments of the present invention in more detail. Although the following describes the preferred embodiments of the present invention rather than all embodiments, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein.

[0023] In the present application, unless otherwise stated, the orientation terms such as "upper, lower" generally refer to the upper and lower in the normal use state of the device, and "inner, outer" refer to the inside and outside relative to the contour of the device. In addition, the terms "first, second, third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first, second, third" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined. Since the drawings are descriptions of the same device, the same reference numerals in the drawings represent the same components.

[0024] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0025] The present application provides a device for biomass chemical and ironmaking production through collaborative coupling, including: a biomass treatment system, including a raw material pretreatment system, an acid hydrothermal pyrolysis system, and a hydrolysis steam condensation system connected in sequence, for generating hydrothermally pyrolyzed carbon and condensed waste liquid using biomass raw materials; an intermediate treatment system, including a wet grinding and deashing system, a solid-liquid separation system, and a heat exchange system connected in sequence, the wet grinding and deashing system is respectively connected to the acid hydrothermal pyrolysis system and the hydrolysis steam condensation system, and the intermediate treatment system is used to generate deashed hydrothermally pyrolyzed biomass carbon, potassium-rich organic waste liquid, and high-temperature and high-pressure saturated steam using the hydrothermally pyrolyzed carbon and the condensed waste liquid; an ironmaking treatment system, including a pulverized coal drying and pulverizing system, a pulverized coal injection system, a blast furnace body, and a hot air system connected in sequence, the pulverized coal drying and pulverizing system is connected to the solid-liquid separation system, and the hot air system is connected to the heat exchange system, for providing heat to the heat exchange system, and the ironmaking treatment system is used to generate molten iron and hot blast stove high-temperature waste gas using the deashed hydrothermally pyrolyzed biomass carbon and pulverized coal introduced from the outside.

[0026] The present application also provides a method for biomass chemical and ironmaking production through collaborative coupling using the above device. Figure 1 The structure of a device for biomass chemical and ironmaking production through collaborative coupling in an embodiment of the present application is shown. Figure 2 The process flow diagram of a method for biomass chemical and ironmaking production through collaborative coupling in an embodiment of the present application is shown. Refer to Figure 1 and Figure 2 , and the specific implementation steps are as follows:

[0027] S1: Provide biomass raw materials.

[0028] In some embodiments, the biomass raw materials include one or a mixture of multiple of corn cobs, agricultural straws, forestry residues, food processing residues, etc. In different embodiments, the selection of the biomass raw materials can be adjusted according to actual situations such as different production conditions and processes, and the present application does not limit this.

[0029] S2: Convert the biomass raw materials into biomass chemical products and hydrothermally pyrolyzed carbon through the biomass treatment system.

[0030] In some embodiments, the conversion of the biomass raw material into biomass chemical products and hydrochar through the biomass treatment system includes: crushing and screening the biomass raw material through the raw material pretreatment system to remove impurities; performing acid hydrothermal decomposition on the biomass raw material after removing impurities through the acid hydrothermal decomposition system to obtain hydrochar and a remaining part, wherein the acid hydrothermal decomposition system includes a dilute acid catalyst; and converting the remaining part into biomass chemical products and condensed waste liquid through the hydrolysis steam condensation system.

[0031] Specifically, first, the biomass raw material with a relatively large size is crushed through the raw material pretreatment system, and impurities are removed. The particle size of the obtained biomass solid particles is less than 2 cm. Then, the biomass raw material after removing impurities is introduced into the acid hydrothermal decomposition system. In the acid hydrothermal decomposition system, hemicellulose in the biomass raw material is prepared into pentose, xylose, and furfural through dilute acid-catalyzed hydrothermal decomposition, and cellulose and lignin undergo hydrothermal reactions under subcritical acid hydrothermal decomposition conditions to generate hydrochar. The biomass acid hydrothermal decomposition process is similar to the traditional hydrothermal carbonization process. The addition of the acidic catalyst accelerates the hydrolysis process of hemicellulose, cellulose, and lignin in the biomass raw material, and the separation of alkali metal potassium elements from organic matter is also achieved during the hydrolysis process.

[0032] In some embodiments, the acid hydrothermal decomposition system includes one or a combination of a continuous high-pressure reactor and a batch high-pressure reactor. The reaction temperature of the acid hydrothermal decomposition is 140 - 230 °C, the acid hydrothermal decomposition pressure is 0.3 - 2.8 MPa, the reaction time is 1 - 6 h, and the generated hydrochar includes a mixture of one or more of pentose residue, xylose residue, and furfural residue.

[0033] In some embodiments, the dilute acid catalyst includes a mixture of one or more of sulfuric acid, acetic acid, hydrochloric acid, nitric acid, Lewis acid, citric acid, etc.

[0034] S3: Convert the hydrochar into deashed hydrothermal biomass char through the intermediate treatment system and generate high-temperature and high-pressure saturated steam.

[0035] In some embodiments, first, the hydrochar and the condensed waste liquid are subjected to wet grinding reaction in a wet grinding deashing system to obtain a mixed solution, and harmful elements are transferred to the liquid phase by utilizing the water-soluble characteristics of potassium element compounds; then, the mixed solution is introduced into a solid-liquid separation system to obtain deashed hydrothermal biomass char and deashing waste liquid. The deashed hydrothermal biomass char is used to provide a heating agent and a reducing agent for subsequent blast furnace production. By performing wet grinding, water washing, and deashing and solid-liquid separation on the acid hydrothermal biomass residue, harmful elements can be transferred to the aqueous phase, and a biomass char product with metallurgical properties that can meet the requirements of blast furnace ironmaking production can be prepared, realizing the improvement of the quality of the acid hydrothermal biomass residue.

[0036] Next, the deashing waste liquid is introduced into a heat exchange system to generate high-temperature and high-pressure saturated steam, low-temperature waste gas, and potassium-rich organic waste liquid. The high-temperature and high-pressure saturated steam is used to provide heat for the acid hydrolysis system, that is, it is recycled back to the acid hydrolysis system for reuse. The potassium-rich organic waste liquid is used as a fertilizer raw material for resource utilization, enabling zero wastewater discharge in the production process.

[0037] In some embodiments, the mass ratio of the hydrothermally decomposed carbon to the condensed waste liquid in the wet grinding and deashing system for the wet grinding reaction ranges from 1:2 to 1:5, the wet grinding temperature is 5 - 85°C, and the wet grinding time is 1 - 60 min.

[0038] In some embodiments, the moisture content of the deashed hydrothermally decomposed biomass carbon separated is 15% - 55%, the dry basis ash content is 2% - 7.5%, the alkali metals (K + Na) are less than 0.3%, the dry basis fixed carbon is 20% - 35%, the dry basis calorific value is 19 - 24 MJ / kg, and the Hardgrove grindability index is 65% - 95%.

[0039] In some embodiments, the temperature range of the obtained high-temperature and high-pressure saturated steam is 170 - 240°C, the steam pressure is 0.8 - 3.3 MPa, the potassium element content in the potassium-rich organic waste liquid is 2.5% - 10.5%, the nitrogen element content is 1.5% - 5.5%, the phosphorus element content is 0.5 - 2.5%, and the organic matter content is 10% - 50%.

[0040] In the embodiments of the present application, using agricultural and forestry residues as raw materials, through acid hydrolysis catalytic reaction, the high-value utilization of hemicellulose in biomass raw materials is realized. Combining with the wet grinding, water washing, and pressure filtration process, a deashed hydrothermally decomposed biomass carbon product with a high fixed carbon content, low ash content, low alkali metal content, and high calorific value is prepared, realizing the high-value utilization of cellulose and lignin and enhancing the utilization value of agricultural and forestry residues.

[0041] It should be noted that in the above description, parameters such as the component ratio of the deashed hydrothermally decomposed biomass carbon, the temperature and pressure of the high-temperature and high-pressure saturated steam, and the component ratio in the potassium-rich organic waste liquid can be adjusted by observing the production results. For example, in the present application, through multiple experiments, the applicant believes that in the production of biomass chemical industry collaborative coupling ironmaking, setting the component ratio of the deashed hydrothermally decomposed biomass carbon within the above range can optimize the efficiency and output of ironmaking production, which is reasonable and in line with reality. The above does not constitute a limitation to the present application. In other embodiments, the component ratio of the deashed hydrothermally decomposed biomass carbon after solid-liquid separation can be set to other values, and the component ratio of the deashed hydrothermally decomposed biomass carbon can be adjusted through steps such as drying during the production process to better adapt to industrial production.

[0042] S4: After mixing the deashing hydrothermal pyrolysis biochar with pulverized coal, molten iron and high-temperature waste gas from a hot blast stove are generated through an ironmaking treatment system.

[0043] Among them, the molten iron is used for ironmaking, and the high-temperature waste gas from the hot blast stove is used to provide heat for the heat exchange system.

[0044] Specifically, in some embodiments, after mixing the deashing hydrothermal pyrolysis biochar with pulverized coal, generating molten iron and high-temperature waste gas from a hot blast stove through an ironmaking treatment system includes: feeding the deashing hydrothermal pyrolysis biochar into a pulverized coal drying and crushing system to be dried, crushed and mixed evenly with the pulverized coal introduced from the outside; through the pulverized coal injection system, feeding the evenly mixed deashing hydrothermal pyrolysis biochar and pulverized coal into the blast furnace body for blast furnace production to generate molten iron, slag and blast furnace gas; feeding the blast furnace gas and outside air into the hot air system together to generate hot air and high-temperature waste gas from the hot blast stove, where the hot air is used for blast furnace production. There is a large amount of medium and low-temperature waste heat in the ironmaking production process, which can also be used as a heat source for biomass chemical enterprises, reducing the production cost of biomass chemical enterprises.

[0045] In some embodiments, the pulverized coal is pulverized coal for blast furnace injection, and the blast furnace injection includes one or more mixtures of lignite, bituminous coal, lean coal, anthracite, semi-coke, coke fines and other carbon-containing fuels. The proportion of the deashing hydrothermal pyrolysis biochar in the mixed fuel of the deashing hydrothermal pyrolysis biochar and pulverized coal is 0.5%-35%.

[0046] In some embodiments, the replacement ratio of replacing pulverized coal for blast furnace injection with deashing hydrothermal pyrolysis biochar for blast furnace injection is 0.8-1.1. Due to the zero carbon emission characteristics during the use of biochar, producing one ton of molten iron in the blast furnace can reduce the cost by 0.5-3.5 yuan and reduce the CO2 emission by 5-100 kg.

[0047] In some embodiments, the temperature range of the high-temperature waste gas from the hot blast stove is 300-450°C, which is used to provide heat for the heat exchange system, that is, the heat required by the heat exchange system is provided by the high-temperature waste gas from the hot blast stove generated by the hot air system, realizing the recovery and utilization of the surplus energy of the high-temperature flue gas in the steel enterprise. In the heat exchange system, the high-temperature waste gas from the hot blast stove is converted into low-temperature waste gas, and the temperature of the low-temperature waste gas is 105-130°C. After purification and detection to meet the emission standards, it is directly discharged.

[0048] In the embodiments of the present application, using the medium and low-temperature flue gas of the hot blast system for blast furnace ironmaking as heat to evaporate and concentrate the water washing waste liquid, the generated high-temperature waste gas from the hot blast stove can be recycled, and the potassium-rich concentrated waste liquid can be used as fertilizer, solving the problem of waste liquid treatment in the biomass chemical industry and realizing the resource utilization of potassium, nitrogen, phosphorus and organic matter in the waste liquid.

[0049] In the above ironmaking process, conditions such as the proportion of deashing water pyrolyzed biomass charcoal and the temperature of the high-temperature waste gas from the hot blast stove are preferred solutions in the embodiments of the present application. In other embodiments, specific conditions such as the type of pulverized coal, the proportion of deashing water pyrolyzed biomass charcoal, and the temperature of the high-temperature waste gas from the hot blast stove can be selected according to different actual situations. Any substitution and transformation of numerical values in the above acid hydrolysis reaction, wet grinding reaction, and ironmaking process are within the protection scope of the present application, and the present application does not limit this.

[0050] The present application prepares solid waste from the biomass chemical industry into high-quality biomass charcoal products. The biomass charcoal can partially replace pulverized coal and be applied to blast furnace ironmaking production, reducing the consumption of fossil fuels in the production process of the traditional steel industry, reducing CO2 emissions, and helping the steel industry achieve the "dual carbon goal".

[0051] The following will take corn cobs, corn straws, and waste wood with different particle size ratios as biomass raw materials for collaborative coupling ironmaking production as specific embodiments for illustration.

[0052] Example 1

[0053] According to the method for collaborative coupling ironmaking production provided by the present application, corn cobs are provided as biomass raw materials, and the corn cobs are crushed by a crusher. The particle size of the corn cob particles is less than 2 cm, and the proportion of particles less than 1.5 cm is greater than 80%; the crushed corn cob particles are acid-mixed, and the type of acid used is dilute sulfuric acid, and the usage amount of dilute sulfuric acid is 4% of the mass of the corn cobs. The acid-mixed corn cob particles are loaded into an intermittent high-pressure reaction kettle through a conveying device, and high-pressure saturated steam at 195 °C is introduced. The pressure in the kettle is 1.1 MPa, and the reaction time is 6 hours. The furfural generated during the reaction enters the furfural condensation separation system with the saturated hydrolysis steam, and crude furfural products and condensed waste liquid are obtained through liquid separation. The residue in the high-pressure reaction kettle is discharged after pressure relief to obtain an acid hydrolysis carbon product, that is, furfural residue.

[0054] The furfural residue and the condensed waste liquid are mixed in a mass ratio of 1:3 and loaded into a wet ball mill for wet grinding. The wet grinding temperature is 30 °C, and the wet grinding time is 5 min. During the wet grinding process, the furfural residue particles are further broken, and the water-soluble potassium salts in the furfural residue dissolve into the liquid phase. The wet-ground mixed liquid is filtered by a plate and frame filter press to obtain deashing water pyrolyzed biomass charcoal and deashing waste liquid. The composition of the deashing water pyrolyzed biomass charcoal is detected, and its moisture content is 55%, the dry basis ash is 3.6%, the alkali metal (K+Na) is 0.24%, the dry basis fixed carbon is 23.1%, the dry basis calorific value is 22.6 MJ / kg, and the Hardgrove grindability index is 85%.

[0055] The deliming waste liquid is transported to a tubular heat exchanger, where it exchanges heat with the high-temperature waste gas from a hot blast stove at 410 °C to generate high-pressure saturated steam at a temperature of 205 °C and a pressure of 1.7 MPa (due to temperature drop during pipeline transportation, to ensure meeting the temperature and pressure conditions for the acid hydrolysis reaction in the reactor, the pressure and temperature of the steam generated by the heat exchanger are slightly higher). The steam is transported through a pipeline to the reactor to participate in the acid hydrothermal decomposition reaction. The temperature of the low-temperature waste gas at the outlet of the tubular heat exchanger is 120 °C. After purification treatment to meet the standards, the waste gas is directly discharged. The remaining potassium-rich organic waste liquid contains 7.5% potassium, 1.7% nitrogen, 1.2% phosphorus, and 35% organic matter. It is sold as raw material for organic fertilizer to fertilizer factories, achieving zero discharge of wastewater in the furfural production process.

[0056] The deliming hydrothermal decomposition biochar is transported to a silo by a belt conveyor. After being weighed by a belt scale, it is fed into the main coal conveyor belt of a coal mill. The mass ratio of the deliming hydrothermal decomposition biochar in the pulverized fuel for injection is 5%, and the rest is 35% bituminous coal, 10% semi-coke, 45% anthracite, and 5% coke fines. The mixed fuel enters a medium-speed coal mill for pulverization, while drying and mixing are achieved simultaneously. After being pulverized by the medium-speed coal mill, the pulverized fuel for injection is detected to have a particle size less than 200 mesh accounting for 85%, a moisture content of 1.5%, and a calorific value of 28300 kJ / kg, meeting the requirements of the blast furnace injection technology for particle size and moisture content. To ensure a high combustion rate of the deliming hydrothermal decomposition biochar in front of the blast furnace tuyere, the hot blast temperature for blast furnace smelting is 1200 °C, the oxygen enrichment rate is 3%, the wind speed is 250 m / s, and the coal injection ratio is 165 kg / tHM. The combustion rate of the pulverized coal injected into the blast furnace in front of the tuyere is detected to be 73%, and the theoretical combustion temperature at the tuyere is 2180 °C. The process of blast furnace smelting remains stable and smooth. After calculation, the replacement ratio of the deliming hydrothermal decomposition biochar injected into the blast furnace replacing the coal injected into the blast furnace is 0.85, reducing the cost of blast furnace hot metal by 0.5 yuan / tHM and reducing the CO2 emission by 16.8 kg / tHM, showing good cost reduction and carbon reduction effects.

[0057] Example 2

[0058] According to the method for co-coupled ironmaking production of biomass and chemical industry provided by the present application, corncobs are provided as biomass raw materials, and the corncobs are crushed by a crusher. The particle size of the corncob particles is below 2 cm, and the proportion of particles smaller than 1.5 cm is greater than 90%. The crushed corncob particles are acid-mixed, and the type of acid used is dilute sulfuric acid, and the usage amount of the dilute sulfuric acid is 3% of the mass of the corncobs. The acid-mixed corncob particles are loaded into an intermittent high-pressure reactor through a conveying device, and high-pressure saturated steam at 140 °C is introduced. The pressure in the reactor is 0.36 MPa, and the reaction time is 4 hours. The xylose generated during the reaction enters the xylose condensation separation system with the saturated hydrolysis steam, and the crude xylose product and the condensed waste liquid are obtained through liquid separation. The residue in the high-pressure reactor is discharged after pressure relief to obtain an acid hydrothermal carbonization product, that is, xylose residue.

[0059] The xylose residue and the condensed waste liquid are mixed in a mass ratio of 1:2 and loaded into a wet ball mill for wet grinding. The wet grinding temperature is 25 °C, and the wet grinding time is 15 min. During the wet grinding process, the xylose residue particles are further crushed, and the water-soluble potassium salts in the xylose residue are dissolved into the liquid phase. The wet-ground mixed liquid is pressure-filtered by a plate-and-frame filter press to obtain de-ashed hydrothermal biomass carbon and de-ashed waste liquid. The composition of the de-ashed hydrothermal biomass carbon is detected. Its moisture content is 58%, the dry basis ash is 2.1%, the alkali metals (K+Na) are 0.05%, the dry basis fixed carbon is 19.2%, the dry basis calorific value is 19.3 MJ / kg, and the Hardgrove grindability index is 71%.

[0060] The de-ashed waste liquid is transported to a tubular heat exchanger, and heat exchange is carried out with the high-temperature waste gas of a 350 °C hot blast stove to generate high-pressure saturated steam at a temperature of 150 °C and a pressure of 0.47 MPa (due to temperature drop during pipeline transportation, to ensure meeting the temperature and pressure conditions of the acid hydrolysis reaction in the reactor, the pressure and temperature of the steam generated by the heat exchanger are slightly higher). The steam is transported to the reactor through a pipeline to participate in the acid hydrothermal reaction. The temperature of the low-temperature waste gas at the outlet of the tubular heat exchanger is 105 °C, and the waste gas is directly discharged after being purified to meet the standards. The content of potassium element in the remaining potassium-rich organic waste liquid is 8.6%, the content of nitrogen element is 2.1%, the content of phosphorus element is 1.7%, and the organic matter content is 32%. It is sold to a fertilizer factory as an organic fertilizer raw material for use, realizing zero discharge of wastewater in the xylose production process.

[0061] The deashed hydrothermal pyrolysis biochar is conveyed to a silo through a belt, weighed by a belt scale, and then added to the main coal conveyor belt of a coal mill. The mass ratio of the deashed hydrothermal pyrolysis biochar in the injected fuel is 10%, and the rest is 30% bituminous coal, 10% semi-coke, 45% anthracite, and 5% coke fines. The mixed fuel enters a medium-speed mill for pulverization, while achieving drying and mixing. After being pulverized by the medium-speed mill, the injected fuel is detected to have a particle size less than 200 mesh at a ratio of 80%, a moisture content of 1.7%, and a calorific value of 26,800 kJ / kg, meeting the requirements of the blast furnace injection technology for particle size and moisture content. To ensure a high combustion rate of the deashed hydrothermal pyrolysis biochar in front of the blast furnace tuyere, the hot blast temperature for blast furnace smelting is 1150°C, the oxygen enrichment rate is 3.5%, the wind speed is 255 m / s, the coal injection ratio is 171 kg / tHM, the combustion rate of the pulverized coal injected into the blast furnace in front of the tuyere is detected to be 76%, the theoretical combustion temperature of the tuyere is 2171°C, and the process of blast furnace smelting remains stable and smooth. After calculation, the replacement ratio of injecting deashed hydrothermal pyrolysis biochar into the blast furnace instead of injecting coal into the blast furnace is 0.8, the cost of blast furnace hot metal is reduced by 1.3 yuan / tHM, and the CO2 emissions are reduced by 26.7 kg / tHM, showing good cost reduction and carbon reduction effects.

[0062] Example 3

[0063] According to the method for biomass chemical engineering collaborative coupling ironmaking production provided by the present application, corn straw is provided as the biomass raw material, and the corn straw is crushed by a crusher. The particle size of the corn straw particles is less than 2 cm, and the proportion of particles less than 1.5 cm is greater than 75%. The crushed corn straw particles are acid-mixed, and the type of acid used is citric acid, and the usage amount of citric acid is 3.5% of the mass of the corncob. The acid-mixed corn straw particles are loaded into an intermittent high-pressure reactor through a conveying device, and high-pressure saturated steam at 180°C is introduced. The pressure in the reactor is 1 MPa, and the reaction time is 4.5 hours. The furfural generated during the reaction enters the furfural condensation separation system with the saturated hydrolysis steam, and the crude furfural product and the condensed waste liquid are obtained through liquid separation. The residue in the high-pressure reactor is discharged after pressure relief to obtain the acid hydrothermal pyrolysis carbon product, that is, furfural residue.

[0064] The furfural residue and the condensed waste liquid are mixed in a mass ratio of 1:4 and loaded into a wet ball mill for wet grinding. The wet grinding temperature is 50°C, and the wet grinding time is 10 min. During the wet grinding process, the xylose residue particles are further broken, and the water-soluble potassium salts in the xylose residue dissolve into the liquid phase. The wet-ground mixed liquid is pressure-filtered by a plate-and-frame filter press to obtain deashed hydrothermal pyrolysis biochar and deashed waste liquid. The composition of the deashed hydrothermal pyrolysis biochar is detected, and its moisture content is 60%, the dry basis ash is 4.3%, the alkali metals (K + Na) are 0.19%, the dry basis fixed carbon is 22.1%, the dry basis calorific value is 21.8 MJ / kg, and the Hardgrove grindability index is 81%.

[0065] The deliming waste liquid is transported to a tubular heat exchanger, where it exchanges heat with the high-temperature exhaust gas from a hot blast stove at 410 °C to generate high-pressure saturated steam at a temperature of 200 °C and a pressure of 1.5 MPa (due to temperature drop during pipeline transportation, to ensure meeting the temperature and pressure conditions for the acid hydrolysis reaction in the reactor, the pressure and temperature of the steam generated by the heat exchanger are slightly higher). The steam is transported through a pipeline into the reactor to participate in the acid hydrothermal decomposition reaction. The temperature of the low-temperature exhaust gas at the outlet of the tubular heat exchanger is 115 °C. After being purified and meeting the standards, the exhaust gas is directly discharged. The remaining potassium-rich organic waste liquid contains 10.9% potassium element, 2.5% nitrogen element, 3.1% phosphorus element, and 45% organic matter. It is sold to a fertilizer factory as raw material for organic fertilizer, achieving zero discharge of wastewater in the furfural production process.

[0066] The deliming hydrothermal pyrolysis biochar is transported to a silo through a belt conveyor. After being weighed by a belt scale, it is fed into the main coal conveyor belt of a coal mill. The mass ratio of the deliming hydrothermal pyrolysis biochar in the pulverized fuel for injection is 15%, and the rest is 25% bituminous coal, 10% semi-coke, 45% anthracite, and 5% coke fines. The mixed fuel enters a medium-speed coal mill for pulverization, and at the same time, drying and mixing are achieved. After being pulverized by the medium-speed coal mill, the pulverized fuel for injection is tested. The proportion of particles smaller than 200 mesh is 83%, the moisture content is 1.8%, and the calorific value is 27700 kJ / kg, meeting the requirements of the blast furnace injection technology for particle size and moisture content. To ensure a high combustion rate of the deliming hydrothermal pyrolysis biochar in front of the blast furnace tuyere, the hot blast temperature for blast furnace smelting is 1180 °C, the oxygen enrichment rate is 3.2%, the wind speed is 251 m / s, and the coal injection ratio is 170 kg / tHM. The combustion rate of the pulverized coal injected into the blast furnace in front of the tuyere is tested to be 77%, and the theoretical combustion temperature at the tuyere is 2161 °C. The process of blast furnace smelting remains stable and smooth. After calculation, the replacement ratio of the deliming hydrothermal pyrolysis biochar injected into the blast furnace replacing the coal injected into the blast furnace is 0.85, the cost of the blast furnace hot metal is reduced by 1.6 yuan / tHM, and the CO2 emission is reduced by 35.4 kg / tHM, showing good effects of cost reduction and carbon reduction.

[0067] Example 4

[0068] According to the method for co-coupled ironmaking production of biomass and chemical industry provided by this application, waste wood is provided as the biomass raw material, and the waste wood is crushed by a crusher. The particle size of the waste wood particles is below 2 cm, and the proportion of particles smaller than 1.5 cm is greater than 80%. The crushed waste wood particles are acid-mixed, and the type of acid used is dilute sulfuric acid, and the usage amount of dilute sulfuric acid is 5.5% of the mass of corncobs. The acid-mixed corncob particles are loaded into an intermittent high-pressure reactor through a conveying device, and high-pressure saturated steam at 205 °C is introduced. The pressure in the reactor is 1.7 MPa, and the reaction time is 3 hours. The furfural generated during the reaction enters the furfural condensation and separation system with the saturated hydrolysis steam, and crude furfural products and condensed waste liquid are obtained through liquid separation. The residue in the high-pressure reactor is discharged after pressure relief to obtain an acid hydrothermal carbonization product, that is, furfural residue.

[0069] The furfural residue and the condensed waste liquid are mixed in a mass ratio of 1:3 and loaded into a wet ball mill for wet grinding. The wet grinding temperature is 30 °C, and the wet grinding time is 10 min. During the wet grinding process, the furfural residue particles are further crushed, and the water-soluble potassium salts in the furfural residue dissolve into the liquid phase. The wet-ground mixed liquid is pressure-filtered by a plate and frame filter press to obtain deashed hydrothermal biomass carbon and deashed waste liquid. The composition of the deashed hydrothermal biomass carbon is detected. Its moisture content is 50%, the dry basis ash is 2.1%, the alkali metals (K + Na) are 0.03%, the dry basis fixed carbon is 35%, the dry basis calorific value is 24 MJ / kg, and the Hardgrove grindability index is 95%.

[0070] The deashed waste liquid is transported to a tubular heat exchanger and exchanges heat with the high-temperature waste gas of a hot blast stove at 450 °C to generate high-pressure saturated steam at a temperature of 215 °C and a pressure of 2.1 MPa (due to temperature drop during pipeline transportation, to ensure meeting the temperature and pressure conditions of the acid hydrolysis reaction in the reactor, the pressure and temperature of the steam generated by the heat exchanger are slightly higher). The steam is transported to the reactor through a pipeline to participate in the acid hydrothermal reaction. The temperature of the low-temperature waste gas at the outlet of the tubular heat exchanger is 150 °C, and the waste gas is directly discharged after being purified to meet the standards. The content of potassium element in the remaining potassium-rich organic waste liquid is 6.5%, the nitrogen element content is 1.9%, the phosphorus element content is 1.1%, and the organic matter content is 45%. It is sold to a fertilizer factory as an organic fertilizer raw material, realizing zero discharge of wastewater in the furfural production process.

[0071] The deashed hydrothermally pyrolyzed biomass char is conveyed to a silo through a belt, weighed by a belt scale and then added to the main coal conveyor belt of a coal mill. The mass ratio of the deashed hydrothermally pyrolyzed biomass char in the pulverized fuel for injection is 15%, and the rest is 25% bituminous coal, 10% semi-coke, 45% anthracite, and 5% coke fines. The mixed fuel enters a medium-speed mill for pulverization, and at the same time, drying and mixing are achieved. The pulverized fuel for injection ground by the medium-speed mill is detected to have a particle size less than 200 mesh at a ratio of 75%, a moisture content of 1.8%, and a calorific value of 26,900 kJ / kg, meeting the requirements of the blast furnace injection technology for particle size and moisture content. To ensure a high combustion rate of the deashed hydrothermally pyrolyzed biomass char in front of the blast furnace tuyere, the hot blast temperature for blast furnace smelting is 1250 °C, the oxygen enrichment rate is 3%, the wind speed is 245 m / s, the coal injection ratio is 178 kg / tHM. The combustion rate of the pulverized coal injected into the blast furnace in front of the tuyere is detected to be 79%, and the theoretical combustion temperature at the tuyere is 2170 °C. The process of blast furnace smelting remains stable and smooth. After calculation, the replacement ratio of the deashed hydrothermally pyrolyzed biomass char injected into the blast furnace replacing the coal injected into the blast furnace is 0.91, the cost of blast furnace hot metal is reduced by 1.3 yuan / tHM, and the CO2 emissions are reduced by 51.7 kg / tHM, showing good effects of cost reduction and carbon reduction.

[0072] The above results further show that the technical solution of the present application can effectively couple and connect the biomass chemical industry and the iron and steel industry, use the solid waste-based biomass char residue of the biomass chemical enterprise to prepare a biomass char product whose metallurgical properties meet the requirements of blast furnace ironmaking production, use the flue gas generated by the hot blast system of blast furnace production to provide heat for the biomass chemical industry, realize the high-value utilization and low-cost production of solid waste in the biomass chemical industry, and have good economic and environmental benefits.

[0073] As described above, the present application provides a device and method for biomass chemical collaborative coupling ironmaking production, which uses the solid waste-based biomass char residue of the biomass chemical enterprise as raw materials, effectively reduces the content of harmful elements through wet grinding and water washing deashing, and prepares a biomass char product whose metallurgical properties can meet the requirements of blast furnace ironmaking production. At the same time, using the low-quality flue gas generated by the hot blast system of blast furnace production as heat to provide low-cost saturated steam for the biomass chemical industry, reducing the production cost of the biomass chemical industry, and realizing the effective coupling and connection of the biomass chemical industry and the iron and steel industry. The technical solution provided by the present application has the characteristics of strong raw material applicability, high production efficiency, low production cost, and less CO2 and pollutant emissions, and has positive economic and environmental significance.

[0074] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made using the content of the specification and drawings of the present application, such as the mutual combination of technical features between various embodiments, or direct or indirect application in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A device for synergistically coupling biomass chemical industry with ironmaking production, characterized in that: include: The biomass processing system comprises a raw material pretreatment system, an acid water pyrolysis system and a hydrolysis steam condensation system which are connected in sequence, and is used to generate hydropyrolysis charcoal and condensed waste liquid using biomass raw materials; An intermediate processing system comprises a wet grinding deashing system, a solid-liquid separation system and a heat exchange system connected in sequence, wherein the wet grinding deashing system is connected to the acid water pyrolysis system and the hydrolysis steam condensation system respectively, and the intermediate processing system is used to generate deashed water pyrolysis biomass charcoal, potassium-rich organic waste liquid and high-temperature and high-pressure saturated steam by using the water pyrolysis charcoal and the condensed waste liquid; The ironmaking processing system includes a coal powder drying and crushing system, a coal powder injection system, a blast furnace body and a hot air system which are connected in sequence. The coal powder drying and crushing system is connected to the solid-liquid separation system, and the hot air system is connected to the heat exchange system to provide heat to the heat exchange system. The ironmaking processing system is used to utilize the deashing water to pyrolyze biochar and coal powder introduced from the outside to generate molten iron and high-temperature exhaust gas from the hot blast furnace.

2. A method for synergistically coupling biomass chemical industry with ironmaking production using the device of claim 1, characterized in that: Includes steps: Providing biomass raw materials; The biomass raw materials are converted into biomass chemical products and hydropyrolysis charcoal through a biomass processing system; The hydropyrolysis char is converted into deashed hydropyrolysis biochar through an intermediate processing system, and high-temperature and high-pressure saturated steam is generated, wherein the deashed hydropyrolysis biochar is used to provide a heating agent and a reducing agent for blast furnace production, and the high-temperature and high-pressure saturated steam is used to provide heat for the acid hydropyrolysis system; The deashing water pyrolysis biomass char is mixed with coal powder, and then the mixture is passed through an ironmaking processing system to generate molten iron and hot blast furnace high-temperature exhaust gas, wherein the molten iron is used for ironmaking, and the hot blast furnace high-temperature exhaust gas is used to provide heat for a heat exchange system.

3. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 2, characterized in that: The converting of the biomass raw material into biomass chemical products and hydropyrolysis charcoal through a biomass processing system comprises: The biomass raw material is crushed and screened through a raw material pretreatment system to remove impurities; the biomass raw material after impurities are removed is subjected to acid-water pyrolysis through the acid-water pyrolysis system to obtain hydropyrolysis charcoal and the remainder, wherein the acid-water pyrolysis system includes a dilute acid catalyst; the remainder is converted into a biomass chemical product and condensed waste liquid through a hydrolysis steam condensation system.

4. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 3, characterized in that: The step of converting the hydropyrolysis charcoal into deashed hydropyrolysis biomass charcoal through an intermediate processing system and generating high-temperature and high-pressure saturated steam comprises: The hydropyrolysis carbon and the condensed waste liquid are subjected to a wet grinding reaction in a wet grinding and deashing system to obtain a mixed solution; Passing the mixed solution into a solid-liquid separation system to obtain deashing water pyrolysis biomass charcoal and deashing waste liquid; The deashing waste liquid is introduced into a heat exchange system to generate high-temperature and high-pressure saturated steam, low-temperature waste gas and potassium-rich organic waste liquid.

5. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 2, characterized in that: The step of pyrolyzing the deashed water biomass charcoal and mixing it with coal powder to generate molten iron and hot blast furnace high-temperature exhaust gas through an ironmaking processing system comprises: The deashed water pyrolysis biomass charcoal is introduced into a coal powder drying and crushing system, and dried, crushed and mixed together with the coal powder introduced from the outside; The mixed deashing water pyrolysis biomass charcoal and coal powder are sent into the blast furnace body through the coal powder injection system for blast furnace production to generate molten iron and blast furnace gas; The blast furnace gas and outside air are introduced into a hot blast system together to generate hot blast and hot blast furnace high-temperature exhaust gas, wherein the hot blast is used for blast furnace production.

6. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 2, characterized in that: The biomass raw material includes a mixture of one or more of corn cobs, agricultural straw, forestry residues, and food processing residues.

7. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 2, characterized in that: The method of crushing and screening the biomass raw materials through the raw material pretreatment system to remove impurities includes: The biomass raw material is crushed, and the particle size of the solid particles of the crushed biological raw material is less than 2 cm.

8. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 3, characterized in that: The dilute acid catalyst includes: a mixture of one or more of sulfuric acid, acetic acid, hydrochloric acid, nitric acid, Lewis acid, and citric acid.

9. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 3, characterized in that: The acid-water pyrolysis system comprises one or more combinations of a continuous high-pressure reactor and an intermittent high-pressure reactor. The reaction temperature of the acid-water pyrolysis is 140-230° C., the acid-water pyrolysis pressure is 0.3-2.8 MPa, the reaction time is 1-6 h, and the generated hydropyrolysis charcoal comprises a mixture of one or more of pentose residue, xylose residue, and furfural residue.

10. The method for synergistically coupling biomass chemical industry with ironmaking production as claimed in claim 4, characterized in that: The conditions for the grinding reaction include: the mass ratio of the hydropyrolysis carbon to the condensed waste liquid is 1:2-1:5, the grinding temperature is 5-85° C., and the grinding time is 1-60 min.

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