CN115806839A - Solid waste treatment system based on sludge and biomass cooperative gasification - Google Patents
Solid waste treatment system based on sludge and biomass cooperative gasification Download PDFInfo
- Publication number
- CN115806839A CN115806839A CN202211510239.4A CN202211510239A CN115806839A CN 115806839 A CN115806839 A CN 115806839A CN 202211510239 A CN202211510239 A CN 202211510239A CN 115806839 A CN115806839 A CN 115806839A
- Authority
- CN
- China
- Prior art keywords
- sludge
- biomass
- combustion furnace
- furnace
- gasification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 155
- 239000002028 Biomass Substances 0.000 title claims abstract description 113
- 238000002309 gasification Methods 0.000 title claims abstract description 91
- 238000009270 solid waste treatment Methods 0.000 title claims abstract description 22
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000002485 combustion reaction Methods 0.000 claims abstract description 70
- 239000003345 natural gas Substances 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 31
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 30
- 239000010941 cobalt Substances 0.000 claims abstract description 30
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- 238000005336 cracking Methods 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000005485 electric heating Methods 0.000 claims description 21
- 238000003860 storage Methods 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 238000006479 redox reaction Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002956 ash Substances 0.000 claims description 8
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 6
- 241000609240 Ambelania acida Species 0.000 claims description 3
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 3
- 244000105624 Arachis hypogaea Species 0.000 claims description 3
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 3
- 235000018262 Arachis monticola Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010905 bagasse Substances 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 3
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 3
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 239000010903 husk Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 235000020232 peanut Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 230000009916 joint effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 26
- 230000008569 process Effects 0.000 abstract description 19
- 230000009471 action Effects 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 9
- 230000002195 synergetic effect Effects 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004523 catalytic cracking Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007605 air drying Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000002306 biochemical method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a solid waste treatment system based on sludge and biomass cooperative gasification, which comprises a sludge drying and conveying subsystem, a biomass drying and conveying subsystem, an air distribution subsystem, a combustion furnace, a gasification furnace and a natural gas collection subsystem; the sludge drying and conveying subsystem, the biomass drying and conveying subsystem and the air distribution subsystem are connected with a combustion furnace, the combustion furnace is sequentially connected with a gasification furnace and a natural gas collecting subsystem, the mixture of the dried sludge and the dried biomass sequentially enters the combustion furnace and the gasification furnace in a fluidized state to generate combustible gas and simultaneously generate tar, a cobalt-based cracking catalyst bed layer is arranged in the gasification furnace, and the tar is catalytically cracked under the combined action of a cobalt-based cracking catalyst and metals in the sludge. The invention carries out organic synergy on the gasification process of the sludge and the biomass, can realize the dual purposes of high-value utilization of the prepared gas and reduction of pollutant emission, and has wide industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment and recycling, and particularly relates to a solid waste treatment system based on sludge and biomass cooperative gasification.
Background
Sludge is a solid precipitated substance produced in the process of municipal sewage treatment, and contains a large amount of heavy metals, pathogenic bacteria, parasites and some organic substances which are difficult to naturally decompose. If the sludge cannot be properly treated, the sludge can cause great harm to water, soil and atmosphere, and the sustainable development of human society and the construction of ecological civilization are seriously influenced. At present, common sludge disposal modes comprise incineration, sea reclamation, compost land utilization and the like, but the common sludge disposal modes have the problems of low economic benefit, easy generation of secondary pollution such as heavy metal and the like, and are difficult to apply on a large scale. Therefore, the development of new efficient and clean sludge treatment technology is needed to meet the requirement of rapid development of sewage treatment industry.
The initial wet sludge has high water content, but the heat value after dehydration and drying can reach more than 10MJ/kg, so the method has good resource utilization potential, and the resource utilization is one of the main development directions of the sludge treatment technology. In addition to the use of thermal energy by incineration, sludge can also be converted to natural gas by biochemical or thermochemical methods. With the comprehensive development of novel urbanization construction in China, on one hand, the further development of public utilities such as sewage treatment and the like is driven, and more sludge cannot be generated and absorbed; on the other hand, the demand for natural gas will also continue to increase. Therefore, the sludge is used for preparing the natural gas instead of the natural gas, thereby realizing resources, energy and environmentHas very important significance in the coordinated development of the components. The process for preparing the substitute natural gas from the sludge mainly comprises a biochemical method and an indirect gasification method, wherein the biochemical method and the indirect gasification method are used for preparing the methane by aerobic-anaerobic fermentation, but the water content and the organic matter content of the digested sludge are still high, so that the sludge needs to be further treated, and meanwhile, the stable, efficient and continuous operation of the whole system is difficult to ensure due to the slow biochemical reaction speed. The indirect gasification method for preparing natural gas is characterized by firstly gasifying sludge to obtain synthetic gas, purifying the synthetic gas, then carrying out water vapor conversion reaction, and separating CO 2 And adjusting H 2 The ratio of the carbon to the carbon monoxide is subjected to methanation reaction to obtain the synthetic natural gas. However, the sludge itself has low volatile matter and fixed carbon content, and thus is difficult to be applied on a large scale.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a solid waste treatment system based on sludge and biomass cooperative gasification, aiming at achieving the dual purposes of high-value utilization of the prepared gas and reduction of pollutant emission by organically cooperating the gasification process of the sludge and the biomass, and having wide industrial application prospect.
In order to achieve the above objects, according to one aspect of the present invention, a solid waste treatment system based on sludge and biomass cooperative gasification is provided, which comprises a sludge drying and conveying subsystem, a biomass drying and conveying subsystem, an air distribution subsystem, a combustion furnace, a gasification furnace, and a natural gas collection subsystem; the system comprises a sludge drying and conveying subsystem, a biomass drying and conveying subsystem and an air distribution subsystem, wherein the sludge drying and conveying subsystem, the biomass drying and conveying subsystem and the air distribution subsystem are connected with a combustion furnace, the combustion furnace is sequentially connected with a gasification furnace and a natural gas collection subsystem, a mixture of dried sludge and dried biomass sequentially enters the combustion furnace and the gasification furnace in a fluidized state, the mixture is gasified in the gasification furnace in a synergistic manner to generate an oxidation-reduction reaction, combustible gas is generated, tar is generated at the same time, a cobalt-based cracking catalyst bed layer is arranged in the gasification furnace, and the tar is catalytically cracked into small molecular gas under the combined action of a cobalt-based cracking catalyst and metal in sludge.
Preferably, the gasification furnace is arranged coaxially above the combustion furnace, so that carbon residue generated by the oxidation-reduction reaction can fall back into the combustion furnace for combustion, and the generated energy can further provide energy for the oxidation-reduction reaction in the gasification furnace; the retention time of the mixture of the dried sludge and the dried biomass in the combustion furnace (16) is 3-7 seconds.
Preferably, the cobalt-based cracking catalyst bed is disposed at an upper portion of the gasifier.
Preferably, the cobalt-based cracking catalyst in the cobalt-based cracking catalyst bed comprises the following components in parts by mass: 3-7% of cobalt, 4-8% of cobalt oxide, 5-11% of cobaltosic oxide, 4-8% of ferroferric oxide, 10-20% of aluminum oxide, 4-8% of cerium dioxide, 3-5% of cobalt nickelate, 12-28% of calcium oxide and 20-40% of quartz sand.
Preferably, the sludge drying and conveying subsystem comprises a sludge storage bin, a sludge dryer, a dried sludge feeding hopper and a dried sludge spiral feeding device which are sequentially connected; the sludge storage bin is used for storing wet sludge containing water, the wet sludge forms dried sludge after passing through the sludge dryer, and then the dried sludge enters the dried sludge feeding hopper and is conveyed into the combustion furnace through the dried sludge spiral feeding device.
Preferably, the biomass drying and conveying subsystem comprises a biomass storage bin, a biomass dryer, a biomass feed hopper and a biomass spiral feeding device which are connected in sequence; the outlet of the biomass spiral feeding device is communicated with the opening of the dried sludge spiral feeding device, so that dried biomass is conveyed to the dried sludge spiral feeding device through the outlet of the biomass spiral feeding device and is uniformly mixed with dried sludge, and the dried sludge and the biomass are stably and continuously conveyed into the combustion furnace through the dried sludge spiral feeding device.
Preferably, the system further comprises a gas concentration device, the gas concentration device is connected with the sludge dryer, the biomass dryer and the combustion furnace, and combustible gas with volatile components in the sludge dryer and the biomass dryer is concentrated and then is fed into the combustion furnace.
Preferably, the natural gas collecting subsystem comprises a gas-solid separator, a natural gas condensing device, a natural gas separating and purifying device and a natural gas storage device which are connected in sequence, and the gas-solid separator is connected with the gasification furnace;
an ash collector for receiving ash is arranged at the bottom of the combustion furnace; the bottom of the gas-solid separator is provided with a fly ash collector for receiving fly ash; a tar collector for receiving residual tar is arranged at the bottom of the natural gas condensing device;
the air distribution subsystem comprises an air blower, an air flow meter, an electric heating device and an air chamber; air conveyed by the blower is heated by the electric heating device and then enters the air chamber, and then sequentially enters the combustion furnace and the gasification furnace.
Preferably, the water content of the dried sludge entering the gasification furnace is 15-35%; the mass of the biomass entering the combustion furnace is 25-55% of the mass of the dried sludge; wherein the biomass is one or more of peanut shells, rice husks, corn cobs and bagasse.
Preferably, the combustion furnace is sleeved with a combustion furnace electric heating temperature control device; the external part of the gasification furnace is sleeved with a gasification furnace electric heating temperature control device; when the mixture of the dried sludge and the dried biomass enters the combustion furnace and the gasification furnace, the temperature of the electric heating temperature control device of the combustion furnace and the electric heating temperature control device of the gasification furnace is 725-825 ℃.
In general, at least the following advantages can be obtained by the above technical solution contemplated by the present invention compared to the prior art.
(1) The solid waste treatment system provided by the invention organically coordinates the gasification process of the sludge and the biomass, can continuously and stably consume and treat sewage and sludge, and makes up the defects of low content of volatile matters and fixed carbon in the sludge by adding the biomass; the traditional combustion and gasification mixing process is separated and independent, and part of energy in the sludge and biomass cooperative gasification process is energy generated by the combustion of residual carbon generated after self gasification; the tar generated in the biomass gasification process is further catalytically cracked in situ by the metal elements contained in the sludge.
(2) The invention leads the sludge and the biomass to pass through the combustion furnace firstly and then enter the gasThe gasification furnace adopts the sequence, so that residual carbon generated in the gasification process can fall back to the combustion furnace for combustion, and the generated energy can further provide energy for the oxidation-reduction reaction in the gasification furnace; on the other hand, after part of toxic and harmful components generated in the combustion process enter the gasification furnace, CO and H generated in the gasification process can be ensured 2 The reductive component is reduced and harmless, so that the prepared gas can be used at a high value, and the dual purposes of reducing pollutant emission can be realized.
(3) According to the invention, the sludge and the biomass are uniformly mixed and then continuously and stably gasified in a synergistic manner, metal elements contained in the sludge can play a role in further in-situ catalytic cracking on tar generated in the biomass gasification process, so that the problem of generation of a large amount of tar in the biomass gasification process can be solved, the synergistic gasification efficiency is effectively improved, and further the natural gas with higher yield and higher purity is prepared. It should be noted that, in the present invention, the effective components Co, fe, ni, and Ce in the cobalt-based cracking catalyst bed layer can form a coordination compound with a very strong catalytic effect with the metal elements contained in the sludge, such as Zn, cu, cr, cd, and Pb, and further, the catalytic cracking effect of the cobalt-based cracking catalyst on tar can be promoted by the synergistic enhancement effect of the cobalt-based cracking catalyst and the metals in the sludge.
(4) In the invention, a part of energy in the process of cooperative gasification of the sludge and the biomass comes from energy generated by burning residual carbon generated after self gasification, and a part of energy comes from energy generated by combustion supporting of combustible gas with volatile components generated by the sludge dryer and the biomass dryer respectively.
(5) The invention can prepare high-quality natural gas, and can further process and utilize the generated ash, fly ash and tar while treating the sludge so as to realize deep resource utilization of the sludge, biomass and other solid wastes.
Drawings
FIG. 1 is a schematic diagram of the general configuration of a solid waste treatment system for the co-gasification of sludge and biomass according to an embodiment of the present invention;
fig. 2 is a diagram of combustible gas components generated when sludge and biomass are co-gasified in a solid waste treatment system for co-gasification of sludge and biomass according to an embodiment of the present invention.
In the figure: 1-a blower; 2-an air flow meter; 3-an electric heating device; 4-an air chamber; 5-ash collector; 6-natural gas storage; 7-a natural gas separation and purification device; 8-a tar collector; 9-natural gas condensing unit; 10-gas-solid separator; 11-a fly ash collector; 12-a gasifier electrical heating temperature control device; 13-cobalt based cracking catalyst; 14-a gasification furnace; 15-a combustion furnace electric heating temperature control device; 16-a combustion furnace; 17-a biomass screw feeder; 18-a biomass feed hopper; 19-a biomass dryer; 20-a sludge dryer; 21-a dried sludge spiral feeding device; 22-a dried sludge feed hopper; 23-sludge storage; 24-biomass storage; 25-gas concentration device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the invention provides a solid waste treatment system for cooperative gasification of sludge and biomass, which comprises a sludge drying and conveying subsystem, a biomass drying and conveying subsystem, an air distribution subsystem, a combustion furnace 16, a gasification furnace 14 and a natural gas collecting subsystem; the system comprises a sludge drying and conveying subsystem, a biomass drying and conveying subsystem and an air distribution subsystem, wherein the sludge drying and conveying subsystem, the biomass drying and conveying subsystem and the air distribution subsystem are connected with a combustion furnace 16, the combustion furnace 16 is sequentially connected with a gasification furnace 14 and a natural gas collecting subsystem, a mixture of dried sludge and dried biomass sequentially enters the combustion furnace 16 and the gasification furnace 14 in a fluidized state, the mixture is gasified cooperatively in the gasification furnace 14 to generate an oxidation-reduction reaction, combustible gas is generated, and tar is generated at the same time, a cobalt-based cracking catalyst bed layer 13 is arranged in the gasification furnace 14, and the tar is catalytically cracked into small molecular gas under the combined action of a cobalt-based cracking catalyst and metal in the sludge.
Conventional biomass gasification processes also have H 2 Low content, high tar content, difficult maintenance of continuous and stable operation, and the like. Tar produced in the biomass gasification process can adhere to fly ash, so that gas transmission pipelines, valves and gas transmission equipment are easily blocked, the continuous and stable operation of the system is influenced, and the gasification efficiency of the biomass is reduced due to the tar. Therefore, how to solve the problem of tar in the biomass gasification process is an important problem for improving the biomass gasification efficiency and ensuring the safe operation of the system. At present, the tar problem generated in the biomass gasification process is mainly solved by washing to remove coke or converting the coke into micromolecular combustible gas through catalytic cracking. Because the tar-containing wastewater with secondary pollution is generated by washing and removing the tar, the tar is removed by adopting a thermochemical method to convert the tar into the micromolecular combustible gas, so that the method has better engineering application prospect.
In a possible manner, the gasifier 14 is arranged coaxially above the burner 16, so that the carbon residue produced by the redox reaction can fall back into the burner for combustion, and the energy produced can further provide energy for the redox reaction in the gasifier. The cobalt-based cracking catalyst bed layer 13 is arranged at the upper part of the gasification furnace 14; the retention time of the mixture of the dried sludge and the dried biomass in the combustion furnace (16) is 3 to 7 seconds. The cobalt-based cracking catalyst in the cobalt-based cracking catalyst bed 13 comprises the following components in parts by mass: 3-7% of cobalt, 4-8% of cobalt oxide, 5-11% of cobaltosic oxide, 4-8% of ferroferric oxide, 10-20% of aluminum oxide, 4-8% of cerium dioxide, 3-5% of cobalt nickelate, 12-28% of calcium oxide and 20-40% of quartz sand.
The sludge drying and conveying subsystem comprises a sludge storage bin 23, a sludge dryer 20, a dried sludge feeding hopper 22 and a dried sludge spiral feeding device 21 which are sequentially connected; the sludge storage bin 23 is used for storing wet sludge containing water, the wet sludge forms dried sludge after passing through the sludge dryer 23, and then the dried sludge enters the dried sludge feed hopper 22 and is stably and continuously conveyed into the combustion furnace 16 through the dried sludge spiral feeding device 21. An opening is arranged above the dried sludge spiral feeding device 21.
The biomass drying and conveying subsystem comprises a biomass storage bin 24, a biomass dryer 19, a biomass feed hopper 18 and a biomass spiral feeding device 17 which are sequentially connected; and the outlet of the biomass spiral feeding device 17 is communicated with the opening of the dried sludge spiral feeding device 21. The biomass storage bin 24 is used for biomass raw materials, the biomass raw materials enter the biomass feed hopper 18 after passing through the biomass dryer 19, then the biomass is conveyed to the dried sludge spiral feeding device 21 through the biomass spiral feeding device 17, and enters the dried sludge spiral feeding device 21 through an opening of the dried sludge spiral feeding device to be uniformly mixed with the dried sludge, and the dried sludge and the biomass are stably and continuously conveyed into the combustion furnace 16 through the dried sludge spiral feeding device 21.
The system also comprises a gas concentration device 25, wherein the gas concentration device 25 is connected with the sludge dryer 20, the biomass dryer 19 and the combustion furnace 16, and combustible gas with volatile matters in the sludge dryer 20 and the biomass dryer 19 is concentrated and then is sent to the combustion furnace 16.
The natural gas collecting subsystem comprises a gas-solid separator 10, a natural gas condensing device 9, a natural gas separating and purifying device 7 and a natural gas storage device 6 which are connected in sequence, and the gas-solid separator 10 is connected with a gasification furnace 14; the bottom of the combustion furnace 16 is provided with a slag collector 5 for receiving slag; the bottom of the gas-solid separator 10 is provided with a fly ash collector 11 for receiving fly ash; and a tar collector 8 for receiving residual tar is arranged at the bottom of the natural gas condensing device 9.
The air distribution subsystem comprises an air blower 1, an air flow meter 2, an electric heating device 3 and an air chamber 4; air delivered by the blower 1 is heated by the electric heating device 3 and then enters the air chamber 4, and then enters the combustion furnace 16 and the gasification furnace 14 in sequence. The blower 1 supplies air to the burner 16 and the gasifier 14; the flow rate of the air can be adjusted by adjusting the frequency of the blower 1 and the valve of the air flow meter 2; the blower 1 provides excess air to be evacuated from the other air path.
The moisture content of the dried sludge entering the gasification furnace 14 is 15-35%; the mass of the biomass entering the combustion furnace 16 is 25-55% of the mass of the dried sludge; wherein the biomass is one or more of peanut shells, rice husks, corncobs and bagasse.
A combustion furnace electric heating temperature control device 15 is sleeved outside the combustion furnace 16; the gasifier 14 is externally sleeved with the gasifier electric heating temperature control device 12, and the temperature control ranges of the combustion furnace electric heating temperature control device 15 and the gasifier electric heating temperature control device 12 are both 0 ℃ to 1000 ℃, and can be respectively and independently controlled.
When the mixture of the dried sludge and the dried biomass enters the combustion furnace 16 and the gasification furnace 14, the temperature of the combustion furnace electric heating temperature control device 15 and the temperature of the gasification furnace electric heating temperature control device 12 are within 725 ℃ to 825 ℃.
The working principle of the solid waste treatment system provided by the invention is as follows: the sludge drying and conveying subsystem dries wet sludge and conveys the dried sludge into the combustion furnace; after biomass is dried by the biomass drying and conveying subsystem, conveying the biomass raw material to the dried sludge spiral feeding device, and feeding the dried sludge into the combustion furnace; then, the dried sludge and the biomass sequentially pass through a combustion furnace and a gasification furnace in a fluidized state under the action of an air distribution subsystem, and are gasified in cooperation in the gasification furnace to generate an oxidation-reduction reaction, so that combustible gas is generated and simultaneously tar is generated; wherein, the upper part of the gasification furnace is provided with a cobalt-based cracking catalyst; the combustible gas carries tar to pass through a cobalt-based cracking catalyst bed layer arranged at the upper part of the gasification furnace, the tar is catalytically cracked under the combined action of the cobalt-based cracking catalyst and the metal in the sludge to generate micromolecular gas, then the combustible gas is treated by a gas-solid separator, a natural gas condensing device and a natural gas separation and purification device, and finally the combustible gas is stored in a natural gas storage device; meanwhile, the sludge and the biomass are gasified in the gasification furnace in a synergic manner to generate residual carbon generated in the oxidation-reduction reaction process, the residual carbon falls back to the combustion furnace to be combusted, and the generated energy can further provide energy for the synergic gasification reaction in the gasification furnace.
Referring to fig. 2, the embodiment of the present invention tests the change of the proportion of combustible gas components generated during the cooperative gasification of sludge and biomass. When the adding proportion of the biomass is 0%, the pure sludge is gasified. Wherein the adding proportion of the biomass is 0-50%. The water content of the dried sludge is 30 percent, the gasification temperature is controlled to be 780 ℃, the gasification efficiency is 88 percent, the carbon residue rate in the gasification process is less than 5 percent, and the heat utilization rate is more than 95 percent. The results of the elemental analysis and industrial analysis of the sludge and biomass used in the experiment are shown in table 1. As can be seen from figure 2, when the sludge and the biomass are mixed and gasified synergistically, a very obvious synergistic promotion effect exists, and the synergistic promotion effect can be used for improving the components of modified combustible gas, wherein the calorific value of synthetic natural gas is 3824.69kJ/Nm 3 . It can be found that as the proportion of biomass addition is increased stepwise, CO is increased 2 And H 2 The content is gradually reduced; the CO content is obviously improved and is increased from 5 percent to 39 percent; CH (CH) 4 The content is increased from 5 percent when biomass is not added to 15 percent, and CH is added along with the increase of the content of the biomass 4 The content is substantially unaffected.
TABLE 1 results of elemental and industrial analysis using sludge and biomass
Wherein M is ad Means air drying based moisture, A ad Is air-drying base ash content, V ad Is air-dry basis ash, FC ad Refers to air-dried based fixed carbon.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A solid waste treatment system based on sludge and biomass collaborative gasification is characterized by comprising a sludge drying and conveying subsystem, a biomass drying and conveying subsystem, an air distribution subsystem, a combustion furnace (16), a gasification furnace (14) and a natural gas collection subsystem; the system comprises a sludge drying and conveying subsystem, a biomass drying and conveying subsystem and an air distribution subsystem, wherein the sludge drying and conveying subsystem, the biomass drying and conveying subsystem and the air distribution subsystem are connected with a combustion furnace (16), the combustion furnace (16) is sequentially connected with a gasification furnace (14) and a natural gas collection subsystem, a mixture of dried sludge and dried biomass sequentially enters the combustion furnace (16) and the gasification furnace (14) in a fluidized state, the mixture is gasified cooperatively in the gasification furnace (14) to generate an oxidation-reduction reaction, combustible gas is generated, and tar is generated at the same time, a cobalt-based cracking catalyst bed layer (13) is arranged in the gasification furnace (14), and the tar is catalytically cracked under the joint action of a cobalt-based cracking catalyst and metal in the sludge.
2. The solid waste treatment system as claimed in claim 1, wherein the gasification furnace (14) is disposed coaxially above the combustion furnace (16) so that the carbon residue generated by the oxidation-reduction reaction can fall back to the combustion furnace to be combusted by its own weight, and the generated energy can further provide energy for the oxidation-reduction reaction in the gasification furnace; the retention time of the mixture of the dried sludge and the dried biomass in the combustion furnace (16) is 3-7 seconds.
3. The solid waste treatment system as claimed in claim 1 or 2, wherein the cobalt-based cracking catalyst bed (13) is disposed at an upper portion of the gasification furnace (14).
4. The solid waste treatment system of claim 1 or 2, wherein the cobalt-based cracking catalyst in the cobalt-based cracking catalyst bed (13) comprises the following components in mass fraction: 3-7% of cobalt, 4-8% of cobalt oxide, 5-11% of cobaltosic oxide, 4-8% of ferroferric oxide, 10-20% of aluminum oxide, 4-8% of cerium dioxide, 3-5% of cobalt nickelate, 12-28% of calcium oxide and 20-40% of quartz sand.
5. The solid waste treatment system according to any one of claims 1-4, wherein the sludge drying and conveying subsystem comprises a sludge storage bin (23), a sludge dryer (20), a dried sludge feed hopper (22) and a dried sludge screw feeder (21) which are connected in sequence; the sludge storage bin (23) is used for storing wet sludge containing water, the wet sludge forms dried sludge after passing through the sludge dryer (23), and then the dried sludge enters the dried sludge feed hopper (22) and is conveyed into the combustion furnace (16) through the dried sludge spiral feeding device (21).
6. The solid waste treatment system of claim 5, wherein the biomass drying and conveying subsystem comprises a biomass storage bin (24), a biomass dryer (19), a biomass feed hopper (18) and a biomass screw feeder (17) connected in series; the outlet of the biomass spiral feeding device (17) is communicated with the opening of the dried sludge spiral feeding device (21), so that dried biomass is conveyed to the dried sludge spiral feeding device through the outlet of the biomass spiral feeding device and is uniformly mixed with dried sludge, and the dried sludge and the biomass are stably and continuously conveyed into the combustion furnace (16) through the dried sludge spiral feeding device.
7. The solid waste treatment system according to claim 6, further comprising a gas concentration device (25), wherein the gas concentration device (25) is connected with the sludge dryer (20), the biomass dryer (19) and the combustion furnace (16) to concentrate the combustible gas with volatile components in the sludge dryer (20) and the biomass dryer (19) and send the concentrated combustible gas into the combustion furnace (16).
8. The solid waste treatment system according to any one of claims 1 to 4, wherein the natural gas collecting subsystem comprises a gas-solid separator (10), a natural gas condensing device (9), a natural gas separating and purifying device (7) and a natural gas storage device (6) which are connected in sequence, and the gas-solid separator (10) is connected with the gasification furnace (14);
the bottom of the combustion furnace (16) is provided with an ash collector (5) for receiving ash; a fly ash collector (11) for receiving fly ash is arranged at the bottom of the gas-solid separator (10); a tar collector (8) for receiving residual tar is arranged at the bottom of the natural gas condensing device (9);
the air distribution subsystem comprises an air blower (1), an air flow meter (2), an electric heating device (3) and an air chamber (4); air conveyed by the blower (1) is heated by the electric heating device (3) and then enters the air chamber (4), and then sequentially enters the combustion furnace (16) and the gasification furnace (14).
9. The solid waste treatment system according to any one of claims 1 to 4, wherein the moisture content of the dried sludge entering the gasifier (14) is 15% to 35%; the mass of the biomass entering the combustion furnace (16) is 25-55% of the mass of the dried sludge; wherein the biomass is one or more of peanut shells, rice husks, corncobs and bagasse.
10. The solid waste treatment system according to any one of claims 1 to 4, wherein a furnace electrical heating temperature control device (15) is externally sleeved on the furnace (16); the external part of the gasification furnace (14) is sleeved with a gasification furnace electric heating temperature control device (12); when the mixture of the dried sludge and the dried biomass enters a combustion furnace (16) and a gasification furnace (14), the temperature of the combustion furnace electric heating temperature control device (15) is 820-900 ℃, and the temperature of the gasification furnace electric heating temperature control device (12) is 720-770 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510239.4A CN115806839B (en) | 2022-11-29 | 2022-11-29 | Solid waste treatment system based on sludge and biomass co-gasification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211510239.4A CN115806839B (en) | 2022-11-29 | 2022-11-29 | Solid waste treatment system based on sludge and biomass co-gasification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115806839A true CN115806839A (en) | 2023-03-17 |
| CN115806839B CN115806839B (en) | 2024-05-14 |
Family
ID=85484410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211510239.4A Active CN115806839B (en) | 2022-11-29 | 2022-11-29 | Solid waste treatment system based on sludge and biomass co-gasification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115806839B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060012934A (en) * | 2004-08-05 | 2006-02-09 | 한국에너지기술연구원 | Apparatus of catalytic gasification for refined biomass fuel at low temperature and the method thereof |
| CN102807901A (en) * | 2012-07-10 | 2012-12-05 | 华中师范大学 | Biomass gasification catalytic cracking process and integral gasification catalytic reactor |
| CN103979491A (en) * | 2014-05-20 | 2014-08-13 | 青岛理工大学 | Method and device for producing hydrogen through blending and gasifying of sludge and biomass |
| WO2016088959A1 (en) * | 2014-12-02 | 2016-06-09 | 삼양에코너지(주) | Combined heat and power generation system using biomass gasification |
| CN106350115A (en) * | 2016-10-11 | 2017-01-25 | 天津大学 | Method for preparing biomass synthesis gas low in nitric oxide content by mixed gasification of biomass and sludge |
| CN110746070A (en) * | 2019-11-19 | 2020-02-04 | 江苏中顺节能科技有限公司 | Biomass gas-carbon co-production coupling sludge deep treatment system and method |
| CN111777309A (en) * | 2020-06-28 | 2020-10-16 | 华中师范大学 | Sludge treatment method capable of reducing discharge |
| CN112047597A (en) * | 2020-09-01 | 2020-12-08 | 浙江工业大学 | Comprehensive treatment process and system for preparing gas fertilizer by combining biological drying and gasification of sludge |
| WO2021004103A1 (en) * | 2019-07-11 | 2021-01-14 | 中国科学院城市环境研究所 | Device and method for cooperatively processing straw and sludge |
-
2022
- 2022-11-29 CN CN202211510239.4A patent/CN115806839B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060012934A (en) * | 2004-08-05 | 2006-02-09 | 한국에너지기술연구원 | Apparatus of catalytic gasification for refined biomass fuel at low temperature and the method thereof |
| CN102807901A (en) * | 2012-07-10 | 2012-12-05 | 华中师范大学 | Biomass gasification catalytic cracking process and integral gasification catalytic reactor |
| CN103979491A (en) * | 2014-05-20 | 2014-08-13 | 青岛理工大学 | Method and device for producing hydrogen through blending and gasifying of sludge and biomass |
| WO2016088959A1 (en) * | 2014-12-02 | 2016-06-09 | 삼양에코너지(주) | Combined heat and power generation system using biomass gasification |
| CN106350115A (en) * | 2016-10-11 | 2017-01-25 | 天津大学 | Method for preparing biomass synthesis gas low in nitric oxide content by mixed gasification of biomass and sludge |
| WO2021004103A1 (en) * | 2019-07-11 | 2021-01-14 | 中国科学院城市环境研究所 | Device and method for cooperatively processing straw and sludge |
| CN110746070A (en) * | 2019-11-19 | 2020-02-04 | 江苏中顺节能科技有限公司 | Biomass gas-carbon co-production coupling sludge deep treatment system and method |
| CN111777309A (en) * | 2020-06-28 | 2020-10-16 | 华中师范大学 | Sludge treatment method capable of reducing discharge |
| CN112047597A (en) * | 2020-09-01 | 2020-12-08 | 浙江工业大学 | Comprehensive treatment process and system for preparing gas fertilizer by combining biological drying and gasification of sludge |
Non-Patent Citations (1)
| Title |
|---|
| 赵小玲;: "生物质气化技术及产业化应用", 中国造纸, no. 12, 15 December 2015 (2015-12-15) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115806839B (en) | 2024-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liew et al. | Stabilization of heavy metals loaded sewage sludge: Reviewing conventional to state-of-the-art thermal treatments in achieving energy sustainability | |
| Li et al. | Wet wastes to bioenergy and biochar: A critical review with future perspectives | |
| CN105505414B (en) | A kind of solid refuse anaerobic catalytic thermocracking process | |
| CN101839488B (en) | Method for gasifying and incinerating combustible solid wastes by utilizing rotary kiln | |
| Luo et al. | Biomass gasification: an overview of technological barriers and socio-environmental impact | |
| Zhang et al. | A hybrid biological and thermal waste-to-energy system with heat energy recovery and utilization for solid organic waste treatment | |
| CN112143525A (en) | Method for producing hydrogen by converting municipal solid waste | |
| Maguyon-Detras et al. | Thermochemical conversion of rice straw | |
| CN103934254A (en) | System and method utilizing cement klin to co-process city household garbage | |
| JP2004149556A (en) | Method for gasifying biomass and gasifying apparatus therefor | |
| CN106497579A (en) | A kind of system and method for domestic garbage resource | |
| CN102031150B (en) | Double-fixed bed gasifier and processing method for organic solid wastes | |
| CN102199449A (en) | Method for producing gas by oxygen enrichment and thermolysis of organic solid wastes | |
| CN110616089B (en) | Gasification device for producing synthesis gas from high-moisture organic material | |
| Zhu et al. | Effective multipurpose sewage sludge and food waste reduction strategies: A focus on recent advances and future perspectives | |
| CN107674691A (en) | A kind of system and method for domestic garbage resource | |
| Wang et al. | N migration and transformation during the co-combustion of sewage sludge and coal slime | |
| CN105903749A (en) | Household garbage treatment method and system | |
| CN111269729A (en) | Method and system for preparing biochar by co-pyrolysis of sludge and waste tires | |
| CN108397777B (en) | A kind of domestic garbage gasification electricity generation system | |
| CN205710623U (en) | A kind of system realizing rubbish charcoal resource | |
| CN207552243U (en) | A kind of system of domestic garbage resource | |
| CN115806839B (en) | Solid waste treatment system based on sludge and biomass co-gasification | |
| CN113321182B (en) | System and method for producing hydrogen by sludge coupling | |
| CN101974351A (en) | Scale fixed bed biomass gasification power generation production technology and complete equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |