Production system for biomass carbonization and gasification combined with biological fermentation

Abstract

The utility model belongs to the field of chemical production, and relates to a production system for biomass carbonization gasification and combined biological fermentation, which comprises a biomass carbonization unit, a charcoal gasification unit and a biological fermentation unit which are sequentially connected in series, the biomass carbonization unit comprises a biomass carbonization furnace, and a biomass inlet, a charcoal outlet and a combustible gas 1 outlet are formed in the biomass carbonization furnace; the biochar gasification unit comprises a biochar gasification furnace, a biochar inlet and a combustible gas 2 outlet are formed in the biochar gasification furnace, and the biochar inlet is connected with the biochar outlet; the biological fermentation unit comprises a fermentation tank, and a combustible gas 2 inlet is formed in the fermentation tank; and the combustible gas 2 inlet is connected with the combustible gas 2 outlet of the biochar gasification unit. According to the technical scheme, in a biological fermentation unit process, the problems that equipment is blocked by tar, microbial growth is inhibited (the metabolic efficiency of fermentation flora is influenced) and the like are effectively avoided, and the production efficiency and the yield are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical production technology relates to a kind of production system of biomass carbonization gasification and combined biological fermentation. BACKGROUND

[0002] The traditional fuel ethanol production process mainly uses corn, wheat, cassava and other food crops as raw materials, and produces ethanol through yeast fermentation technology. However, since this process uses food and crops as the main raw material, the production cost is relatively high. At the same time, the technology of converting biomass into fuel ethanol has become an important direction in the current research field. At present, due to the cost and enzyme activity of cellulase, the production cost of this technology is still high, and it faces great challenges in industrialization promotion.

[0003] To solve the above technical problems, the prior art such as patent CN109055438A provides a method and device for preparing ethanol, protein feed and natural gas from biomass. After the renewable biomass resources are treated by pressurized gasification, purification and other processes, fermentation gas containing CO and H2 is formed, and then fuel ethanol is produced by gas fermentation technology, and the produced bacterial mash liquid is further separated and dried to form bacterial protein powder which can be used as animal feed.

[0004] However, the fermentation gas produced by direct gasification of biomass has complex components, mainly including H2, CO, alkane (such as methane) and other effective components (may further contain CO2), as well as tar, sulfur compounds, nitrogen compounds, dust and other impurities. If this combustible gas is directly used for biological fermentation, there are the following key challenges: tar and impurities affect. The tar produced in the gasification process is easy to deposit on the surface of the pipeline or the fermentation microorganism, causing problems such as microbial growth inhibition (affecting the metabolic efficiency of the fermentation bacterial population) and reducing the product yield.

[0005] Therefore, during the biological fermentation process, the combustible gas needs to be purified, but currently there are difficulties in purification, and the purification cost is also relatively high.

[0006] Therefore, it is necessary to provide a new biological fermentation production system to further save energy and reduce consumption, improve product quality, and further reduce process difficulty and cost. UTILITY MODEL CONTENT

[0007] The purpose of the present application is to provide a production system for carbonization and gasification of biomass and combined biological fermentation, characterized in that the production system comprises a biomass carbonization unit, a biochar gasification unit and a biological fermentation unit connected in series.

[0008] The biomass carbonization unit comprises a biomass carbonization furnace, and the biomass carbonization furnace is provided with a biomass inlet, a biochar outlet and a combustible gas 1 outlet, which are used for converting biomass into biochar and combustible gas 1.

[0009] The biochar gasification unit comprises a biochar gasification furnace, and the biochar gasification furnace is provided with a biochar inlet and a combustible gas 2 outlet, which are used for converting biochar into combustible gas 2, and the biochar inlet is connected with the biochar outlet.

[0010] The biofermentation unit comprises a biofermentation tank, and the biofermentation tank is provided with a combustible gas 2 inlet; the combustible gas 2 inlet is connected with the combustible gas 2 outlet of the biochar gasification unit; the combustible gas 2 comprises CO and hydrogen, and the combustible gas 2 is used for biofermentation.

[0011] Preferably, the production system further comprises a methanol synthesis unit, and the methanol synthesis unit comprises a methanol synthesis tower, and the methanol synthesis tower is provided with a combustible gas 2 inlet and a methanol outlet; the combustible gas 2 inlet of the methanol synthesis tower is connected with the combustible gas 2 outlet, and the combustible gas 2 is used for chemical synthesis of methanol.

[0012] Preferably, the production system further comprises a combustible gas 1 combustion unit, and the combustible gas 1 combustion unit comprises a combustible gas 1 combustion furnace, which is used for burning combustible gas 1 to generate high-temperature flue gas; the combustible gas 1 combustion furnace comprises a combustible gas 1 inlet, an oxygen-containing gas inlet and a high-temperature flue gas outlet; a jacket is arranged on the outer wall of the biochar carbonization furnace, and the jacket is provided with the flue gas inlet and the flue gas outlet, which are used for the high-temperature flue gas to enter and exit; the combustible gas 1 inlet is connected with the combustible gas 1 outlet, and the flue gas inlet of the jacket is connected with the high-temperature flue gas outlet of the combustible gas 1 combustion furnace.

[0013] Preferably, the production system further comprises a biomass preheating unit, and the biomass preheating unit comprises a biomass preheating furnace, and the biomass preheating furnace is provided with a flue gas inlet, a biomass inlet, a biomass outlet and a flue gas outlet; the biomass inlet is used for adding biomass raw materials; and the biomass raw material outlet is used for outputting preheated biomass.

[0014] The biomass raw material outlet is connected with the biomass inlet of the biomass carbonization unit, and the flue gas inlet of the biomass preheating furnace is connected with the flue gas outlet of the biomass carbonization furnace.

[0015] Preferably, the production system further comprises a combustible gas 2 heat energy recovery unit, which is arranged between the biochar gasification unit and the biofermentation unit, and is used for exchanging the heat energy of the combustible gas 2 generated by the biochar gasification unit with cooling water to become preheated water; the combustible gas heat energy recovery unit comprises a gas-liquid heat exchanger, and the gas-liquid heat exchanger comprises a combustible gas 2 inlet, a combustible gas 2 outlet, a cooling water inlet and a preheated water outlet.

[0016] The combustible gas 2 inlet is connected with a combustible gas 2 outlet in the biochar gasification unit.

[0017] Preferably, the production system further comprises a boiler unit connected with the biomass gasification unit for heating water into water vapor;

[0018] The boiler unit comprises a combustion furnace or an electric heating furnace;

[0019] The combustion furnace or the electric heating furnace comprises a preheated water inlet and a water vapor outlet;

[0020] The preheated water inlet is connected with the preheated water outlet of the combustible gas 2 heat energy recovery unit, and the water vapor outlet is connected with a water vapor inlet of the biomass gasification unit.

[0021] Preferably, a combustible gas 2 purification unit is arranged between the combustible gas 2 outlet of the biochar gasification unit and the combustible gas 2 inlet of the fermentation tank, and the combustible gas 2 purification unit comprises a combustible gas 2 purification device for purifying the combustible gas 2 into carbon monoxide and hydrogen; the combustible gas 2 outlet is connected with the combustible gas 2 purification unit.

[0022] Preferably, the production system further comprises a combustible gas 2 storage unit and a combustible gas 2 adjusting unit, the combustible gas 2 storage unit is connected with the combustible gas 2 purification unit and the combustible gas 2 adjusting unit, for storing the purified combustible gas 2 and delivering the combustible gas 2 to the combustible gas 2 adjusting unit, and the adjusting unit is used for adjusting the proportion of carbon monoxide and hydrogen to generate synthesis gas; the production system further comprises a synthesis gas storage unit, the synthesis gas storage unit is connected with the combustible gas 2 adjusting unit and a methanol synthesis unit, for storing the synthesis gas generated by the adjusting unit and delivering the synthesis gas to the methanol synthesis unit.

[0023] Preferably, the production system further comprises a purge gas storage unit, the methanol synthesis tower is communicated with the purge gas storage unit and the synthesis gas storage unit through a switching valve, and the purge gas storage unit is communicated with the combustible gas 2 inlet of the fermentation tank.

[0024] Preferably, the fermentation tank further comprises a fermentation tail gas outlet and a fermentation liquid outlet; the production system further comprises a fermentation tail gas storage unit and a fermentation liquid treatment unit, the fermentation tail gas outlet is communicated between the purge gas storage unit and the fermentation tail gas storage unit through a switching valve; the fermentation liquid outlet is connected with the fermentation liquid treatment unit; and the fermentation tail gas outlet is connected with the boiler unit.

[0025] Compared with the prior art, the production system of the utility model mainly realizes the following technical effects in the bio-fermentation process:

[0026] 1) Avoid tar to produce blockage problem of equipment: the existing biomass gasification technology can obtain combustible gas 2 with high content of tar and other impurities, which can cause a series of problems of biomass fermentation: tar and impurities affect. The tar produced in the gasification process is easy to deposit on the surface of the pipeline or the fermentation microorganism, causing problems such as microbial growth inhibition (affecting the metabolic efficiency of the fermentation bacterial population), which seriously affects the production efficiency and yield. The combustible gas suitable for biological fermentation can be obtained only through a complex purification process, which not only increases the production cost, but also affects the production efficiency. Through the production system of the utility model, the biomass carbonization, biochar gasification and biofermentation unit are connected in series, the biomass is carbonized first, and most of the volatile matter in the biomass can be converted into combustible gas 1, and most of the tar is released with the combustible gas 1 in the biomass carbonization process. The volatile matter contained in the biochar obtained after carbonization is less. Then the biochar is gasified to obtain combustible gas 2, and the content of tar and other impurities in the combustible gas 2 is greatly reduced. Through the segmented gas production process of biomass carbonization and biochar gasification, the combustible gas 1 and the combustible gas 2 can be collected and utilized separately. The combustible gas 2 has low content of tar and other impurities, and is used for biofermentation to obtain green organic products such as alcohol, acid and bacterial protein, which effectively solves the above problems.

[0027] 2) High energy utilization rate and low emission: the existing technology usually adopts the way of burning fossil fuel in the process of carbonization, gasification and high-temperature steam gasification, which not only increases the energy consumption, but also does not meet the requirements of energy saving and emission reduction. The combustible gas 1 produced by biomass carbonization and the fermentation tail gas produced in the biofermentation process are further combusted to provide heat energy for the processes of biomass carbonization, biomass preheating and biomass gasification steam preheating, realizing efficient utilization of biomass, reducing traditional petrochemical fuel consumption and achieving energy saving and emission reduction.

[0028] 3) Wide industrialization application prospect: the production system of the utility model can be combined with the methanol synthesis process to chemically synthesize methanol and synthesize alcohol, acid, bacterial protein and biological enzyme through the biofermentation process, which has wide application prospect in the fields of biomass energy technology, chemical engineering and alcohol, acid, bacterial protein and biological enzyme production technology, and has large market demand and good commercial value. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0030] Figure 1Structure diagram of a production system for gasifying and fermenting biomass.

[0031] Figure 2 Structure diagram of a biomass carbonization furnace.

[0032] Figure 3 Structure diagram of a biomass gasification furnace.

[0033] Figure 4 Structure diagram of a biomass fermentation tank.

[0034] Figure 5 Structure diagram of a combustible gas 1 combustion furnace.

[0035] Figure 6 Structure diagram of a biomass preheating furnace.

[0036] Figure 7 Structure diagram of a combustible gas heat energy recovery device.

[0037] Figure 8 Structure diagram of a combustion furnace of a boiler unit.

[0038] Figure 9 Structure diagram of a spraying device.

[0039] Figure 10 Structure diagram of a methanol synthesis tower.

[0040] Figure 11 Structure diagram of another production system for gasifying and fermenting biomass.

[0041] The specific embodiments of the present application have been shown in the above-described drawings, and will be described in more detail hereinafter. The drawings and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work are within the scope of protection of the present application.

[0043] It should be appreciated that every instance in which "one embodiment" or "an embodiment" is mentioned throughout the specification, that the particular feature, structure, or characteristic being mentioned is included in at least one embodiment of the application. Therefore, the appearance of "in one embodiment" or "in an embodiment" at various places throughout the specification is not necessarily referring to the same embodiment. Furthermore, these particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0044] Biomass carbonization refers to a process in which biomass is slowly decomposed and removed of volatile matter under limited oxygen supply or complete lack of oxygen, and heated to produce a solid carbon product. In addition to the solid carbon product, combustible gas (such as CO, H2, and small molecule alkane combustible gas) and biomass tar are also produced.

[0045] Biomass gasification refers to a process in which, under certain thermodynamic conditions, with the help of water vapor, oxygen, or water vapor combined with oxygen, the high polymers of biomass undergo pyrolysis, oxidation, and reduction reforming reactions, and are ultimately converted into combustible gases such as carbon monoxide, hydrogen, and small molecule hydrocarbons, as well as biomass tar.

[0046] Biochar gasification refers to a process in which, under certain thermodynamic conditions, with the help of water vapor, oxygen, or water vapor combined with oxygen, biomass carbon is ultimately converted into combustible gases such as carbon monoxide, hydrogen, and small molecule hydrocarbons.

[0047] Bio-fermentation is a process in which bacteria use carbon monoxide and hydrogen as the main nutrient components to grow, reproduce, and metabolize in the fermentation broth, and synthesize green chemicals such as alcohol, acid (such as small molecule compounds such as ethanol, butanediol, acetic acid, lactic acid), bacterial proteins, and biological enzymes.

[0048] Since biomass tar is a volatile component of biomass, if biomass is directly converted into combustible gas through biomass gasification, and the combustible gas is used in the bio-fermentation synthesis process, the high tar content will affect the bio-fermentation synthesis process, and the tar and impurities will easily deposit on the pipeline or the surface of the fermentation microorganisms, causing microbial growth inhibition (affecting the metabolic efficiency of the fermentation bacterial population), and seriously affecting the production efficiency and yield.

[0049] Therefore, in order to solve the problem of the influence of biomass tar on the production efficiency and yield of bio-fermentation, the present application provides a combined production system for converting biomass into combustible gas and using it for bio-fermentation, as shown in Figure 1 which includes a biomass carbonization unit, a biochar gasification unit, and a bio-fermentation unit connected in series.

[0050] The production system of the utility model, the biomass carbonization unit, the biochar gasification unit and the biological fermentation unit are connected in series, the biomass is carbonized first, when the biomass carbonization is converted into biochar, the most volatile components in the biomass can be converted into combustible gas 1, most of the tar is released with the combustible gas 1 in the biomass carbonization process, and the obtained biochar after carbonization contains less volatile components. The biochar gasification is carried out, combustible gas 2 is obtained, and the tar and other impurities in the combustible gas 2 are greatly reduced. Through the segmented gas production process of biomass carbonization and biochar gasification, the combustible gas 1 and the combustible gas 2 can be collected and utilized separately. The combustible gas 2 has low tar and other impurity contents, is used for biological fermentation, and has important significance for reducing the combustible gas purification cost.

[0051] The biomass carbonization unit comprises a biomass carbonization furnace, and the biomass carbonization furnace is used for carbonizing biomass to generate biochar and combustible gas 1. Figure 2 As shown in the figure, the biomass carbonization furnace comprises a biomass inlet, a biochar outlet, a combustible gas 1 outlet and a jacket structure arranged on the surface of the biomass carbonization furnace, and the jacket structure is provided with a flue gas inlet and a flue gas outlet. The biomass inlet is used for adding biomass raw materials, the biochar outlet is used for outputting biochar generated by carbonization of biomass in the biomass carbonization furnace, and the combustible gas 1 outlet is used for outputting combustible gas 1 generated by heating of biomass.

[0052] The biomass carbonization furnace is used for heating biomass under the condition of limited oxygen supply or complete oxygen deficiency (for example, the biomass is heated by means of combustion of flammable fuel or by means of input of high-temperature flue gas), so that the biomass is carbonized at 450-950 DEG C (for example, 450 DEG C, 550 DEG C, 650 DEG C, 750 DEG C, 850 DEG C, 950 DEG C, etc.) to generate biochar and combustible gas 1.

[0053] The biochar gasification unit comprises a biochar gasification furnace, and the biochar gasification furnace is used for gasifying biochar to generate combustible gas 2. Figure 3 As shown in the figure, the biochar gasification furnace comprises a biochar inlet and a combustible gas 2 outlet; the biochar inlet is connected with the biochar outlet of the biomass carbonization unit and is used for inputting biochar, and the combustible gas 2 generated by gasification of the biochar is outputted to the combustible gas 2 heat energy recovery unit through the combustible gas 2 outlet.

[0054] In the optional embodiment, in order to realize the biochar gasification, a water vapor inlet (and / or an oxygen inlet) is additionally arranged and is used for inputting high-temperature water vapor and / or oxygen into the biomass carbonization furnace to participate in the biomass gasification reaction, so that the biomass is converted into CO, H2 and combustible gas such as alkane.

[0055] In the preferred embodiment, the biochar gasification unit further comprises an ash discharge outlet, and the ash generated by gasification of the biochar is discharged through the ash discharge outlet.

[0056] In some embodiments, the biochar gasification unit uses high-temperature steam as a gasifying agent to gasify biochar into combustible gas 2 at a high temperature of 450-950°C (exemplarily including 450°C, 550°C, 650°C, 750°C, 850°C, 950°C, etc.).

[0057] In a preferred embodiment, the biochar gasifier further includes an oxygen-containing gas inlet for introducing a limited or small amount of oxygen into the biochar gasifier to assist in the gasification of the biochar. In a more preferred embodiment, the water vapor may also contain oxygen, which is then introduced into the biochar gasification unit.

[0058] The bio-fermentation unit includes a bio-fermentation tank. The bio-fermentation tank serves as a container for microorganisms to ferment using combustible gas 2. Within it, microorganisms utilize components such as CO and H2 in the combustible gas 2 to grow, reproduce, metabolize, ferment, and synthesize green chemicals such as alcohols, acids (e.g., small molecule compounds like ethanol, butanediol, acetic acid, and lactic acid), microbial proteins, and bioenzymes.

[0059] like Figure 4 As shown, the bio-fermentation tank is equipped with a combustible gas inlet 2; the combustible gas inlet 2 is connected to the combustible gas outlet 2 of the biochar gasification unit. The fermentation tank also has a feeding port, a liquid inlet, and a fermentation broth outlet. The feeding port is used to add solid nutrients such as inoculum and electrolytes to the fermentation tank; the liquid inlet is used to add the nutrient solution required for cell growth; the fermentation broth outlet is connected to a fermentation broth treatment unit, through which the fermentation broth can be output to the fermentation broth treatment unit for further purification or separation to obtain the fermentation product.

[0060] The production system also includes a combustible gas combustion unit, which includes a combustible gas combustion furnace for burning combustible gas to generate high-temperature flue gas. This high-temperature flue gas is used to heat biomass in the biomass carbonization unit, thereby achieving the recovery and utilization of combustible gas. Figure 5 As shown, the combustible gas combustion furnace 1 includes a combustible gas inlet 1, a combustion-supporting gas inlet 1, and a high-temperature flue gas outlet 1. The high-temperature flue gas generated by the combustible gas combustion unit 1 is output through the high-temperature flue gas outlet 1 and enters the biomass carbonization unit through the flue gas inlet 1.

[0061] In some embodiments, the production system further includes a biomass preheating unit. The function of the biomass preheating unit is to utilize the residual heat energy of the waste flue gas after heat exchange in the biomass carbonization furnace to preheat and dry the biomass, thereby achieving efficient utilization of heat energy.

[0062] like Figure 6As shown, the biomass preheating unit comprises a biomass preheating furnace, which is provided with a flue gas inlet, a biomass inlet, a biomass outlet and a flue gas outlet; the biomass inlet is used for adding biomass raw materials; the biomass raw material outlet is used for outputting preheated biomass raw materials; the biomass raw material outlet is connected with the biomass inlet in the biomass carbonization unit; and the flue gas inlet on the biomass preheating furnace is connected with the flue gas outlet of the biomass carbonization furnace. The preheating furnace is a gas-solid heat exchange device, and the present application does not make more detailed limitations on the structure of the biomass preheating furnace, and the person skilled in the art can adjust it according to actual needs.

[0063] In a preferred embodiment, the production system further comprises a flue gas environmental protection unit, which is connected with the flue gas outlet of the biomass preheating unit, and is used for performing environmental protection treatment on the flue gas.

[0064] In a preferred embodiment, a combustible gas 2 heat energy recovery unit is arranged between the biomass carbonization unit and the biomass fermentation unit, which functions to exchange heat energy between high-temperature combustible gas 2 and cooling water, so that the cooling water becomes preheated water, the heat energy of the combustible gas 2 is recovered, and the combustible gas 2 is cooled. The combustible gas 2 heat energy recovery unit comprises a combustible gas heat energy recovery device, such as a gas-liquid heat exchanger. As a specific embodiment, as shown in the figure, Figure 7 As shown, the combustible gas heat energy recovery device is a gas-liquid heat exchanger, which is provided with a combustible gas 2 inlet, a combustible gas 2 outlet, a cooling water inlet and a preheated water outlet, the combustible gas 2 inlet is connected with the combustible gas 2 outlet in the biomass carbonization unit, the combustible gas 2 outlet is connected with the combustible gas 2 purification unit, and the cooling water inlet and the preheated water outlet are used for entering cooling water and outputting preheated water.

[0065] The present application does not make more detailed limitations on the specific structure of the combustible gas 2 heat energy recovery unit, and the person skilled in the art can adjust it according to actual needs based on the prior art.

[0066] In a preferred embodiment, the production system further comprises a boiler unit. The purpose of the boiler unit is to receive the preheated water in the combustible gas 2 heat energy recovery unit, heat the preheated water into water vapor, and send it into the biomass carbonization unit.

[0067] The boiler unit comprises a combustion furnace or an electric heating furnace, which is connected with the combustible gas 2 heat energy recovery unit and the biomass gasification unit.

[0068] In a more preferred embodiment, the boiler unit comprises a combustion furnace. As shown in the figure, Figure 8As shown, the combustion furnace includes a fuel inlet, an oxygen-containing gas inlet (for example, an air inlet), a preheated water inlet, a flue gas outlet, and a water vapor outlet. The fuel inlet of the combustion furnace is used to input fuel (for example, biomass or fermentation tail gas output by a biological fermentation unit), and the preheated water inlet of the combustion furnace is connected to the preheated water outlet of the combustible gas 2 heat energy recovery unit.

[0069] The preheated water is heated to water vapor (exemplarily including 100℃-950℃, for example, 100℃, 200℃, 300℃, 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, 950℃, etc.) in the boiler unit.

[0070] The combustion furnace or electric heating furnace for heating water to convert water vapor in the utility model can be an existing device in the prior art, which will not be described in detail here.

[0071] In some embodiments, the production system further includes a combustible gas 2 purification unit arranged between the combustible gas 2 outlet of the biochar gasification unit and the combustible gas 2 inlet of the biological fermentation unit. The combustible gas 2 purification unit includes a combustible gas 2 purification device for removing tar, sulfur compounds, nitrogen compounds and other non-combustible impurities.

[0072] The combustible gas 2 purification unit includes a gas purification device, which can be, for example, a liquid spraying device, or a liquid bubbling washing device, a Venturi tube gas washing device, or a solid-phase adsorption device, etc. In a preferred embodiment, the purification device of the combustible gas 2 purification unit is a spraying device, which functions to wash the combustible gas 2 to remove carbon dioxide, sulfur oxides, nitrogen oxides, tar and other impurities to obtain combustible gases such as CO, H2 and alkanes. Figure 9 As shown, the spraying device includes a combustible gas 2 inlet, a combustible gas 2 outlet, a washing water inlet, a washing water outlet, etc. The combustible gas 2 inlet is connected to the combustible gas 2 outlet in the combustible gas 2 heat energy recovery unit, and the combustible gas 2 outlet is connected to the biological fermentation unit.

[0073] The specific structure of the spraying device is not limited in the present application, and can be adjusted according to actual needs by those skilled in the art.

[0074] In a preferred embodiment, the production system further includes a methanol synthesis unit, which includes a methanol synthesis tower provided with a combustible gas 2 inlet and a methanol outlet. The combustible gas 2 is used for chemical synthesis of methanol. Figure 10 As shown, the device of the methanol synthesis tower includes a combustible gas 2 inlet, a methanol and tail gas outlet.

[0075] In a more preferred embodiment, as shown, Figure 11The diagram shown is a schematic representation of another production system that combines biomass carbonization and gasification with bio-fermentation. The production system described herein... Figure 1 The production system shown further includes a methanol synthesis unit. This methanol synthesis unit is located between the biochar gasification unit and the bio-fermentation unit. Through, as... Figure 11 In the production system shown, the methanol synthesis unit first performs chemical synthesis of methanol on the combustible gas 2 output from the combustible gas 2 purification unit. After the chemical synthesis of methanol, the remaining purge gas (or combustible gas 2) is output to the bio-fermentation unit for bio-fermentation. This allows for full utilization of combustible gas 2. Alternatively, by setting up multiple branch pipelines, combustible gas 2 can be input to the bio-fermentation unit for bio-fermentation and the methanol synthesis unit for methanol synthesis, thereby enabling the production system to have more diversified functions.

[0076] In a preferred embodiment, such as Figure 11 As shown, the production system also includes a combustible gas 2 storage unit and a combustible gas 2 modulation unit. The combustible gas 2 storage unit is connected to the combustible gas 2 purification unit and is used to store the purified combustible gas 2. The combustible gas 2 storage unit is connected to the combustible gas 2 purification unit and the combustible gas 2 modulation unit and is used to store the purified combustible gas 2 and supply combustible gas 2 to the combustible gas 2 modulation unit. The combustible gas 2 modulation unit is used to adjust the ratio of carbon monoxide and hydrogen in the combustible gas 2 storage unit.

[0077] In a preferred embodiment, such as Figure 11 As shown, the production system further includes a syngas storage unit, which is connected to the modulation unit of the combustible gas 2 and the methanol synthesis unit. The syngas storage unit stores the syngas generated by the modulation unit and supplies it to the methanol synthesis unit. The combustible gas 2 storage unit can be one or more combustible gas 2 storage tanks, and the syngas storage unit can be one or more syngas storage tanks.

[0078] In a more preferred embodiment, such as Figure 11 As shown, the production system also includes a purge gas storage unit, which is one or more purge gas storage tanks. The methanol synthesis tower is connected to the purge gas storage tank and the storage tank of the synthesis gas storage unit through a switching valve. The purge gas storage tank is connected to the combustible gas inlet 2 of the fermentation tank.

[0079] The methanol produced in the methanol synthesis process and the tail gas are discharged from the outlet of the synthesis tower, wherein the methanol is cooled into liquid by a cooling process and collected by a methanol collection tank. After the methanol is collected from the tail gas, according to the residual components in the tail gas, if the contents of CO and H2 are high, the tail gas can be directly transported to the combustible gas 2 storage unit for storage; if the contents of CO or H2 in the tail gas are low, the tail gas is transported to the purge gas storage tank for storage.

[0080] In more preferred embodiments, as shown in Figure 1 and Figure 11 The production system further comprises a fermentation tail gas storage unit and a fermentation liquid treatment unit; the fermentation tail gas outlet is communicated between the purge gas storage unit and the fermentation tail gas storage unit through a switching valve, and the fermentation liquid outlet is connected to the fermentation liquid treatment unit; the fermentation tail gas outlet is connected to the boiler unit; the fermentation tail gas storage unit comprises a fermentation waste gas storage tank for collecting the waste gas produced by fermentation.

[0081] The tail gas produced in the biological fermentation process is discharged from the fermentation tail gas outlet, and according to the residual components in the tail gas, if the contents of CO and H2 are high, the tail gas can be directly transported to the combustible gas 2 storage unit for storage; if the contents of CO or H2 in the tail gas are low, the tail gas is transported to the purge gas storage tank for storage. If the gas in the purge gas storage tank contains CO, it can be further input into the biological fermentation process for biological fermentation.

[0082] The fermentation tail gas storage unit can be further communicated with the boiler unit, and the combustible gas included in the fermentation waste gas is input into the combustion furnace of the boiler unit for heating water.

[0083] The main function of the fermentation liquid treatment unit is to collect bacterial cells, extract bacterial cell proteins, biological enzymes, or alcohol or acid compounds, etc. through filtration, centrifugation, sedimentation, flocculation, distillation and other devices. Therefore, the fermentation liquid treatment unit can be selected from a concentration device, a sedimentation device, a centrifugation device, a filtration device, a flocculation device, a dilution device, a distillation device, an adsorption device, an ion exchange device, a drying device, etc. The fermentation liquid treatment unit is conventionally selected according to the components of the fermentation liquid, which will not be described in detail here.

[0084] In some embodiments, the purpose of the flue gas environmental protection treatment unit is to treat waste flue gas. The flue gas environmental protection treatment unit is not specifically limited in the present application, and those skilled in the art can adjust it according to actual needs.

[0085] In the present embodiment, some pipeline units or devices for transmitting the combustible gas, oxygen, water, water vapor, flue gas, etc. are also required, such as gas pipelines, pressure gauges, flow valves, switching valves, thermometers, etc., and some solid transmission units for transporting the biomass to the system and between different units, and devices for collecting the ash converted from the biomass, etc. are required, which are designed according to the actual needs by those skilled in the art, and are not specifically limited herein.

[0086] According to the above production system, the production process of bio-fermentation and methanol synthesis by converting biomass into combustible gas specifically includes the following steps:

[0087] (1) Biomass carbonization: biomass is obtained at a temperature of 450-950°C (exemplarily including 450°C, 550°C, 650°C, 750°C, 850°C, 950°C, etc.) to obtain solid residues (biochar) and combustible gas 1, and the preferred temperature is 500-700°C (for example, 500°C, 550°C, 600°C, 650°C, 700°C, etc.), and the biochar after the reaction is transferred to the biochar gasification furnace through the biochar outlet.

[0088] (2) Biochar gasification: the biomass carbon is converted into combustible gas 2 and biomass ash (including residual carbon, i.e., the carbon remaining in the biomass ash) at a temperature of 450-950°C (exemplarily including 450°C, 550°C, 650°C, 750°C, 850°C, 900°C, etc.) by introducing 100-950°C (exemplarily including 100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C, etc.) water vapor.

[0089] (3) Heat energy recovery of combustible gas 2: the high-temperature combustible gas 2 prepared in step 2 is cooled to preheated water by heat exchange through the combustible gas 2 heat energy recovery unit.

[0090] (4) Preparation of water vapor: the preheated water produced in step 3 is heated by a boiler unit to prepare 100-950°C (exemplarily including 100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C, etc.) water vapor, which is transmitted to the biochar gasification step of step 2.

[0091] (5) Purification of combustible gas 2: after the indirect heat exchange between the combustible gas 2 and the water, the combustible gas 2 is washed and purified with lye in the combustible gas 2 purification unit to remove impurities such as carbon dioxide and tar, to obtain the purified combustible gas 2 mainly composed of carbon monoxide, hydrogen, and small molecule alkanes, etc., which is stored in the combustible gas 2 storage unit.

[0092] (6) Synthesis of methanol: combustible gas 2 is output from the combustible gas 2 storage unit, and the proportion of carbon monoxide and hydrogen in the combustible gas 2 is adjusted by the adjustment unit to obtain combustible gas 2 with a hydrogen and carbon monoxide ratio of 2.1-1.9 (including 2.1, 2, 1.9, etc. by way of example), and the combustible gas 2 is chemically synthesized into methanol in a methanol synthesis tower.

[0093] (7) Bio-fermentation: using carbon monoxide and hydrogen in combustible gas 2 as the main components, the microorganism cells are continuously proliferated, and through metabolism, chemicals such as alcohol, acid, cell protein, and biological enzymes are produced, the fermentation liquid containing alcohol and acid produced by the fermenter is sent to a distillation device for purification and separation to obtain alcohol and acid, the residual liquid output by the distillation device is further concentrated, separated, dried, etc. to obtain cell protein and biological enzymes. CO or H2 contained in the fermentation tail gas can be transported to the boiler unit for combustion treatment, or sent to the purge gas storage device for storage. The strain and feeding components are conventionally selected based on existing technologies according to the needs of the products (for reference, the patent with the patent application number CN201811038287.1 related technology), which will not be described here.

[0094] The above is only an optional embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A production system that combines biomass carbonization and gasification with bio-fermentation, characterized in that, The production system includes a biomass carbonization unit, a biochar gasification unit, and a bio-fermentation unit connected in series. The biomass carbonization unit includes a biomass carbonization furnace, which is equipped with a biomass inlet, a biochar outlet, and a combustible gas outlet, used to convert biomass into biochar and combustible gas. The biochar gasification unit includes a biochar gasifier, which is equipped with a biochar inlet and a combustible gas 2 outlet for converting biochar into combustible gas 2. The biochar inlet is connected to the biochar outlet. The bio-fermentation unit includes a bio-fermentation tank, which is provided with a combustible gas inlet 2; the combustible gas inlet 2 is connected to the combustible gas outlet 2 of the biochar gasification unit; the combustible gas 2 is used for bio-fermentation.

2. The production system according to claim 1, characterized in that, It also includes a methanol synthesis unit. The methanol synthesis unit includes a methanol synthesis tower, which is provided with a combustible gas 2 inlet and a methanol outlet. The combustible gas 2 inlet and the combustible gas 2 outlet of the methanol synthesis tower are connected, and the combustible gas 2 is used for the chemical synthesis of methanol.

3. The production system according to claim 1, characterized in that, It also includes a combustible gas 1 combustion unit, which includes a combustible gas 1 combustion furnace for burning combustible gas 1 to generate high-temperature flue gas. The combustible gas 1 combustion furnace includes a combustible gas 1 inlet, an oxygen-containing gas inlet, and a high-temperature flue gas outlet. The outer wall of the biomass carbonization furnace is provided with a jacket, and the jacket is provided with the flue gas inlet and the flue gas outlet for the inlet and outlet of high-temperature flue gas. The combustible gas 1 inlet is connected to the combustible gas 1 outlet, and the flue gas inlet on the jacket is connected to the high-temperature flue gas outlet of the combustible gas 1 combustion furnace.

4. The production system according to claim 3, characterized in that, The production system also includes a biomass preheating unit; The biomass preheating unit includes a biomass preheating furnace, which is provided with a flue gas inlet, a biomass inlet, a biomass outlet, and a flue gas outlet. The biomass inlet is used to add biomass raw materials; Biomass feedstock exports are used for exporting preheated biomass; The biomass feedstock outlet is connected to the biomass inlet of the biomass carbonization unit; the flue gas inlet on the biomass preheater is connected to the flue gas outlet of the biomass carbonization furnace.

5. The production system according to claim 1, characterized in that, It also includes a combustible gas 2 heat energy recovery unit set between the biochar gasification unit and the bio-fermentation unit, which is used to exchange the heat energy of the combustible gas 2 generated by the biochar gasification unit with the cooling water, thereby turning the cooling water into preheated water. The combustible gas heat recovery unit includes a gas-liquid heat exchanger, which includes a combustible gas inlet 2, a combustible gas outlet 2, a cooling water inlet, and a preheated water outlet. The combustible gas inlet 2 is connected to the combustible gas outlet 2 in the biochar gasification unit.

6. The production system according to claim 5, characterized in that, The production system also includes a boiler unit, which is connected to a biomass gasification unit and is used to heat water and convert it into steam. The boiler unit includes a combustion furnace or an electric heating furnace; the combustion furnace or electric heating furnace includes a preheated water inlet and a steam outlet; the preheated water inlet is connected to the preheated water outlet of the combustible gas 2 heat energy recovery unit, and the steam outlet is connected to the steam inlet of the biomass gasification unit.

7. The production system according to claim 2, characterized in that, It also includes a combustible gas 2 purification unit disposed between the combustible gas 2 outlet of the biochar gasification unit and the combustible gas 2 inlet of the fermenter. The combustible gas 2 purification unit includes a combustible gas 2 purification device and is connected to the combustible gas 2 outlet.

8. The production system according to claim 7, characterized in that, The production system also includes a combustible gas 2 storage unit and a combustible gas 2 modulation unit. The combustible gas 2 storage unit is connected to the combustible gas 2 purification unit and the combustible gas 2 modulation unit, and is used to store the purified combustible gas 2 and supply combustible gas 2 to the combustible gas 2 modulation unit. The modulation unit is used to adjust the ratio of carbon monoxide and hydrogen to generate syngas. The production system also includes a syngas storage unit, which is connected to the combustible gas 2 modulation unit and the methanol synthesis unit, and is used to store the syngas generated by the modulation unit and supply syngas to the methanol synthesis unit.

9. The production system according to claim 8, characterized in that, The production system also includes a purge gas storage unit. The methanol synthesis tower is connected to the purge gas storage unit and the synthesis gas storage unit via a switching valve. The purge gas storage unit is connected to the combustible gas inlet 2 of the fermenter.

10. The production system according to claim 9, characterized in that, The production system further includes a fermentation tail gas storage unit and a fermentation broth treatment unit; the fermentation tank further includes a fermentation tail gas outlet and a fermentation broth outlet, the fermentation tail gas outlet is connected to the venting gas storage unit and the fermentation tail gas storage unit through a switching valve, and the fermentation broth outlet is connected to the fermentation broth treatment unit.

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