High-concentration organic waste liquid mixed biomass pyrolysis gasification system

Abstract

The utility model provides a high-concentration organic waste liquid mixed biomass pyrolysis gasification system which comprises a pair of pyrolysis furnaces which are arranged in parallel, first outlets of the pair of pyrolysis furnaces are jointly connected with a first inlet of a coal mill, an outlet of the coal mill is sequentially connected with a semi-coke slurry storage tank and a semi-coke slurry pump, and the semi-coke slurry storage tank is connected with the semi-coke slurry pump. An outlet of the semi-coke slurry pump is connected with a first inlet of a gasification furnace, a first outlet of the gasification furnace is connected with a first inlet of a heat exchanger, a first outlet of the heat exchanger is connected with a washing tower, and after biomass is subjected to pyrolysis modification, the biomass is mixed with high-concentration organic waste liquid to prepare semi-coke slurry. And feeding into a gasification furnace for high-temperature gasification of the semi-coke slurry to prepare the synthesis gas. Under the high-temperature condition, the conversion rate of biomass can be increased, the yield of synthesis gas can be increased, organic matter in organic waste liquid can be effectively decomposed, meanwhile, gasified gas with the high added value is generated, and the technical problem that in the prior art, the utilization rate of high-concentration organic waste liquid is not high is solved.

Description

Technical Field

[0001] The utility model belongs to the field of wastewater treatment and relates to a biomass pyrolysis and gasification system, in particular to a high-concentration organic waste liquid mixed biomass pyrolysis and gasification system. Background Art

[0002] High-concentration organic waste liquid and biomass contain a lot of organic matter. If they are utilized as resources, they can not only manage the environment and protect water resources, but also turn waste into treasure, partially replace traditional fossil energy, reduce primary energy consumption and the environmental problems caused by the process. However, high-concentration organic waste liquid is highly toxic and has a high COD concentration, and cannot be effectively degraded by conventional wastewater treatment technology.

[0003] At present, the more effective resource recovery methods include advanced oxidation technology, biological method and incineration technology. After high-concentration organic waste liquid is treated by advanced oxidation technology and biological method, a large amount of sludge will be produced, and these sludges still contain many harmful substances such as organic matter and microorganisms, which need to be treated for a second time, and the process is relatively complicated; compared with other methods, the incineration method has the advantages of significant reduction, large processing volume, and high organic matter removal rate, but the incineration method also has environmental pollution, such as the exhaust gas contains harmful gases such as NOx, HCl, SO2 and dioxins, and salt and alkali recovery.

[0004] High-temperature gasification technology can simultaneously process various forms of waste, including dry, wet, homogeneous, and heterogeneous. High-concentration organic waste liquid is mixed with biomass raw materials after pretreatment to prepare semi-coke slurry, and high-temperature gasification reaction is carried out in the gasifier to generate high-value-added combustible gas; the gasification process is carried out under high-temperature conditions of lack of oxygen or anaerobic conditions, blocking the generation of organic gaseous pollutants such as dioxins; harmful heavy metals in the raw materials are fixed in the slag to avoid secondary pollution; the organic wastewater generated in the process can be directly used to prepare semi-coke slurry without the need for water treatment. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system to solve the technical problem of low utilization rate of high-concentration organic waste liquid in the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A high-concentration organic waste liquid mixed with biomass pyrolysis gasification system, comprising a pair of pyrolysis furnaces arranged in parallel, the first outlets of the pair of pyrolysis furnaces being commonly connected to the first inlet of a coal mill, the outlets of the coal mills being sequentially connected to a semi-coke slurry storage tank and a semi-coke slurry pump, the outlet of the semi-coke slurry pump being connected to the first inlet of a gasifier, the first outlet of the gasifier being connected to the first inlet of a heat exchanger, the first outlet of the heat exchanger being connected to a washing tower, the first outlet of the washing tower being respectively connected to a burner and a synthesis gas storage tank;

[0008] The second outlet of the gasifier is connected to the first inlet of one of the pyrolysis furnaces; the second outlet of the heat exchanger and the third outlet of the gasifier are both connected to the first inlet of another pyrolysis furnace; the outlet of the burner is connected to the second inlet of the gasifier; the second outlets of a pair of pyrolysis furnaces are commonly connected to the first inlet of the gasifier;

[0009] The coal mill is provided with an inlet for high-concentration organic waste liquid;

[0010] The pyrolysis furnace is provided with a raw material inlet.

[0011] The present invention also includes the following technical features:

[0012] A nozzle is arranged on the outlet of the semi-coke slurry pump.

[0013] The gasifier is a two-stage reactor, the upper stage is a gasification reaction stage, and the lower stage is a sensible heat recovery stage.

[0014] The burner is provided with an air inlet.

[0015] The washing tower is provided with an external grey water treatment unit.

[0016] A slag pool is arranged at the bottom of the gasifier.

[0017] The gasification temperature of the gasifier is 1200-1450°C, and the gasification pressure is 6-8Mpa.

[0018] The biomass drying temperature of the pyrolysis furnace is 105-120°C and the pressure is 0.2MPa.

[0019] The biomass pyrolysis temperature of the pyrolysis furnace is 350-450° C. and the pressure is 0.2-2 MPa.

[0020] The feed ratio of raw materials to a pair of pyrolysis furnaces is 1:1.

[0021] Compared with the prior art, the utility model has the following beneficial technical effects:

[0022] (I) In the utility model, the biomass is pyrolyzed and modified, and then mixed with high-concentration organic waste liquid to prepare semi-coke slurry, which is then sent to a gasifier for high-temperature gasification of the semi-coke slurry to prepare synthesis gas. Under high temperature conditions, not only can the conversion rate of biomass and the output of synthesis gas be improved, but also the organic matter in the organic waste liquid can be effectively decomposed, and high-value-added gasification gas can be produced at the same time, solving the technical problem of low utilization rate of high-concentration organic waste liquid in the prior art.

[0023] (II) Secondly, the entrained-bed gasification process has a short reaction time, high treatment efficiency, and does not produce pollutants such as tar and dioxins, which is beneficial to environmental protection.

[0024] (III) In addition, by effectively recovering the high-temperature flue gas, sensible heat of gasification gas and other energies in the process, the energy consumption of the entire process can be significantly reduced, thereby improving energy utilization efficiency and effectively reducing costs, which has a good development prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] The meanings of the numbers in the figure are: 1-the first branch, 2-the second branch, 3-the third branch, 4-the fourth branch, 5-the fifth branch, 6-the sixth branch, 7-the seventh branch, 8-the eighth branch, 9-the ninth branch.

[0027] The specific contents of the utility model are further explained in detail below in conjunction with the embodiments. DETAILED DESCRIPTION

[0028] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0029] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0030] The present invention provides a high-concentration organic waste liquid mixed with biomass pyrolysis gasification system, such as Figure 1 As shown, it includes a pair of pyrolysis furnaces arranged in parallel, the first outlets of the pair of pyrolysis furnaces are commonly connected to the first inlet of a coal mill, the outlet of the coal mill is sequentially connected to a semi-coke slurry storage tank and a semi-coke slurry pump, the outlet of the semi-coke slurry pump is connected to the first inlet of a gasifier, the first outlet of the gasifier is connected to the first inlet of a heat exchanger, the first outlet of the heat exchanger is connected to a washing tower, and the first outlet of the washing tower is respectively connected to a burner and a synthesis gas storage tank;

[0031] The second outlet of the gasifier is connected to the first inlet of one pyrolysis furnace; the second outlet of the heat exchanger and the third outlet of the gasifier are both connected to the first inlet of another pyrolysis furnace; the outlet of the burner is connected to the second inlet of the gasifier; the second outlets of a pair of pyrolysis furnaces are commonly connected to the first inlet of the gasifier;

[0032] The coal mill is provided with an inlet for high-concentration organic waste liquid;

[0033] The pyrolysis furnace is equipped with a raw material inlet.

[0034] In the above technical scheme, two streams of biomass raw materials are respectively input into two pyrolysis furnaces, and the drying and pyrolysis modification reactions of the raw materials are simultaneously completed in the pyrolysis furnaces. The gaseous tar and pyrolysis gas generated in the process directly enter the gasification furnace through the ninth branch pipe 9 for further reaction; the semi-coke obtained after pyrolysis in the two pyrolysis furnaces is sent to the coal mill through the first branch pipe 1, and then the high-concentration organic waste liquid is sent to the coal mill for pulping; the obtained semi-coke slurry is stored in a semi-coke slurry storage tank, and the semi-coke slurry stored in the semi-coke slurry storage tank is sent to the gasification furnace through the semi-coke slurry pump and the second branch pipe 2. The gasification furnace performs a high-temperature gasification reaction under the action of an external heat source, and the obtained high-temperature crude synthesis gas is passed through the third branch pipe. The raw material in one pyrolysis furnace is supplied with heat for drying and pyrolysis by the medium-temperature flue gas generated by the gasifier through the sixth branch pipe 6, and the heat for the raw material in the other pyrolysis furnace is supplied with heat for drying and pyrolysis by the medium-temperature flue gas generated by the gasifier through the sixth branch pipe 6. The heat for the raw material in the other pyrolysis furnace is supplied with high-temperature steam generated by recovering the sensible heat of the high-temperature crude syngas generated by the gasifier through the sixth branch pipe 7.

[0035] After the biomass is pyrolyzed and modified, it is mixed with high-concentration organic waste liquid to prepare semi-coke slurry, and then sent to the gasifier for high-temperature gasification of the semi-coke slurry to prepare synthesis gas. Under high temperature conditions, it can not only improve the conversion rate of biomass and the output of synthesis gas, but also effectively decompose the organic matter in the organic waste liquid, and produce high-value-added gasification gas, solving the technical problem of low utilization rate of high-concentration organic waste liquid in the existing technology.

[0036] Specifically, a nozzle is provided on the outlet of the semi-coke slurry pump.

[0037] In the above technical solution, the nozzle can quickly atomize the semi-coke slurry and increase the reaction rate.

[0038] Specifically, the gasifier is a two-stage reactor, the upper stage is a gasification reaction stage, and the lower stage is a sensible heat recovery stage.

[0039] In the above technical solution, a two-stage reactor is selected, which completes the gasification of raw materials on the one hand, and on the other hand, realizes the recovery and reuse of energy, thereby improving the energy efficiency of the entire process.

[0040] Specifically, the burner is provided with an air inlet.

[0041] In the above technical solution, a proper amount of pure oxygen can be added through the air inlet during the gasification process, thereby increasing combustion to increase the gasification temperature.

[0042] Specifically, an external grey water treatment unit is provided on the scrubbing tower.

[0043] In the above technical solution, the grey water treatment unit is used to collect the grey water generated by the washing tower, and the collected grey water can be directly used to prepare the semi-coke slurry without the need for wastewater treatment.

[0044] Specifically, a slag pool is provided at the bottom of the gasifier, and the provision of the slag pool is conducive to the removal of waste slag produced by the reaction. Specifically, the gasification temperature of the gasifier is 1200-1450°C, and the gasification pressure is 6-8Mpa. In the above technical scheme, the setting of high temperature and high pressure is conducive to the rapid conversion of semi-coke slurry and improves the conversion efficiency. Specifically, the biomass drying temperature of the pyrolysis furnace is 105-120°C, and the pressure is 0.2MPa. Specifically, the biomass pyrolysis temperature of the pyrolysis furnace is 350-450°C, and the pressure is 0.2-2MPa. Specifically, the feed ratio of raw materials to a pair of pyrolysis furnaces is 1:1.

Claims

1. A high-concentration organic waste liquid mixed with biomass pyrolysis gasification system, comprising a pair of pyrolysis furnaces arranged in parallel, characterized in that: The first outlets of a pair of pyrolysis furnaces are commonly connected to the first inlet of a coal mill, the outlet of the coal mill is sequentially connected to a semi-coke slurry storage tank and a semi-coke slurry pump, the outlet of the semi-coke slurry pump is connected to the first inlet of a gasifier, the first outlet of the gasifier is connected to the first inlet of a heat exchanger, the first outlet of the heat exchanger is connected to a washing tower, and the first outlet of the washing tower is respectively connected to a burner and a synthesis gas storage tank; The second outlet of the gasifier is connected to the first inlet of one of the pyrolysis furnaces; the second outlet of the heat exchanger and the third outlet of the gasifier are both connected to the first inlet of another pyrolysis furnace; the outlet of the burner is connected to the second inlet of the gasifier; the second outlets of a pair of pyrolysis furnaces are commonly connected to the first inlet of the gasifier; The coal mill is provided with an inlet for high-concentration organic waste liquid; The pyrolysis furnace is provided with a raw material inlet.

2. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: A nozzle is arranged on the outlet of the semi-coke slurry pump.

3. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The gasifier is a two-stage reactor, the upper stage is a gasification reaction stage, and the lower stage is a sensible heat recovery stage.

4. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The burner is provided with an air inlet.

5. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The washing tower is provided with an external grey water treatment unit.

6. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: A slag pool is arranged at the bottom of the gasifier.

7. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The gasification temperature of the gasifier is 1200-1450°C, and the gasification pressure is 6-8Mpa.

8. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The biomass drying temperature of the pyrolysis furnace is 105-120°C and the pressure is 0.2MPa.

9. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The biomass pyrolysis temperature of the pyrolysis furnace is 350-450° C. and the pressure is 0.2-2 MPa.

10. The high-concentration organic waste liquid mixed with biomass pyrolysis and gasification system according to claim 1, characterized in that: The feed ratio of raw materials to a pair of pyrolysis furnaces is 1:1.

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