CN115282765A - Application of municipal sludge in preparation of carbide slag composite desulfurizer - Google Patents
Application of municipal sludge in preparation of carbide slag composite desulfurizer Download PDFInfo
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- CN115282765A CN115282765A CN202210891860.3A CN202210891860A CN115282765A CN 115282765 A CN115282765 A CN 115282765A CN 202210891860 A CN202210891860 A CN 202210891860A CN 115282765 A CN115282765 A CN 115282765A
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- sludge
- carbide slag
- municipal sludge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/32—Compressing or compacting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/38—Stirring or kneading
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/55—Slag
Abstract
The invention discloses an application of municipal sludge in preparation of a carbide slag composite desulfurizer, and belongs to the technical field of desulfurizer preparation. Aiming at the problems of low desulfurization efficiency in a dry-state ultrafine carbide slag furnace, difficult sludge treatment and high cost, the municipal sludge with the water content of 80-90 percent is doped into high-sulfur coal fine powder with the particle size of less than 3mm and dry-state carbide slag with the water content of less than 7 percent, and the carbide slag, the high-sulfur coal and the sludge are bonded together by utilizing the caking property of the municipal sludge, so that the carbide slag is efficiently desulfurized after entering the furnace; the water absorption of the dry-state ultrafine carbide slag is utilized to adjust the water content in the sludge, the problem of large water content in the sludge when the sludge enters the furnace for combustion is solved under the condition of no need of drying, and the prepared composite desulfurizer is used for dry desulfurization in the circulating fluidized bed furnace, so that the problem of sludge disposal in the actual operation of a sewage treatment plant is solved, the problem of low desulfurization utilization rate in the dry-state ultrafine carbide slag furnace is solved, and the process scheme is an effective waste utilization process scheme.
Description
Technical Field
The invention belongs to the technical field of desulfurizer preparation, and particularly relates to application of municipal sludge in preparation of a carbide slag composite desulfurizer.
Background
The energy structure of China always gives priority to coal, and accounts for about 70% of the total energy in China. The pollution in the atmosphere is mainly soot type smoke pollution caused by combustion and SO in the atmospheric pollutants 2 The method not only causes great damage to the ecological environment, industry and civil facilities, but also produces great harm to the health of human beings. In order to treat the increasingly deteriorating atmospheric environment, it is first necessary to limit the amount of pollutants discharged. According to relevant statistics, the SO in the power industry of China 2 The emission accounts for about 50 percent of the total emission in China, and in order to control environmental pollution and reduce the occurrence of acid rain, GB 13223-2011 'emission Standard of atmospheric pollutants for thermal power plants' newly released in 2011 stipulates that the emission Standard of sulfur dioxide for thermal power plants is 200mg/m 3 . According to the requirements of coal-electricity energy-saving emission-reduction upgrading and modification action plans (2014-2020), the emission concentration of atmospheric pollutants of 11 province and city newly-built coal-fired generating sets in the eastern region basically reaches the emission limit value of the gas turbine set, 8 province and newly-built generating sets in the middle region basically approach or reach the emission limit value of the gas turbine set, and the newly-built generating sets in the western region are encouraged to approach or reach the emission limit value of the gas turbine set. Namely: SO (SO) 2 Emission standard is 35mg/Nm 3 . The circulating fluidized bed combustion technology is a clean coal combustion technology with high efficiency and low pollution, and has the characteristics of high-efficiency desulfurization and low-nitrogen combustion. The desulfurization technology is usually the combination of in-furnace desulfurization and flue gas desulfurization after the furnace. The in-furnace desulfurization is characterized by adding dry calcium-based desulfurizing agent into the furnace and SO produced in the coal combustion process 2 Reaction, effective reduction of SO 2 And (4) discharging.
The carbide slag is waste slag generated in the process of producing polyvinyl chloride by an acetylene method, has good desulfurization efficiency, can realize 'treatment of waste by waste', and is widely applied to desulfurization in a circulating fluidized bed furnace. The particle size range of the dry calcium-based desulfurizer which meets the best desulfurization efficiency of the circulating fluidized bed furnace is 0.3-0.7 mm. However, a large amount of carbide slag powder generated by a part of PVC manufacturers has the particle size of less than 0.2mm, and when the carbide slag powder is used for circulating fluidized bed desulfurization, the carbide slag powder directly discharged along with wind smoke after entering a hearth, cannot realize effective sulfur fixation, and is very serious in waste. The large amount of excess sludge generated by the sewage treatment plant not only causes operational and economic burdens on the sewage treatment plant, but also wastes a large amount of land resources due to the stockpiling of the sludge. The municipal sludge has certain heat value and viscosity, and the dry-based heat value of the municipal sludge is similar to that of lignite. The heat value and the viscosity of the sludge after dehydration pretreatment are worth utilizing. At present, most of sludge of most municipal sewage treatment plants is conveyed to a circulating fluidized bed furnace for combustion treatment, but drying and dehydration are needed, the energy consumption is high, a large amount of odor is generated, the odor needs to be further separated and enters the furnace for combustion, and the odor is difficult to control. The amount of water brought by the furnace top pumping into the furnace is larger, the combustion of the furnace is influenced, the efficient utilization of dry-state ultrafine carbide slag is realized by adopting a composite desulfurizer process preparation technology, a large amount of municipal sludge is treated, and the problems that the sludge is difficult to enter the furnace, the water content is large, the combustion is influenced, and the carbide slag escapes are solved. Has important significance for reducing the air pollution of a thermal power plant and promoting the ecological civilized construction of cities.
Disclosure of Invention
The invention provides application of municipal sludge in preparation of a carbide slag composite desulfurizer, aiming at the problems of low desulfurization efficiency in a dry-state ultrafine carbide slag furnace, difficult sludge treatment and disposal and high cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the application of municipal sludge in preparing the carbide slag composite desulfurizer is characterized in that the municipal sludge with the water content of 80-90 percent is mixed with high-sulfur coal fine powder with the particle size of less than 3mm and dry carbide slag with the water content of less than 7 percent, and the mixture is molded by a double-stage double-roller rolling molding device and conveyed to a desulfurization production line.
Further, the composition is prepared from the following components in percentage by mass: 30-35% of high-sulfur coal fine powder, 55-60% of dry carbide slag and 5-10% of sludge.
Further, the total sulfur content in the high-sulfur coal is more than 3%.
Further, the particle size of the dry carbide slag is less than 0.3mm.
Further, 57% of carbide slag, 35% of high-sulfur coal fine powder and 7% of sludge are preferable.
Further, the sludge is secondary sedimentation tank sludge of a sewage treatment plant.
Further, a layer of high-sulfur coal fine powder is firstly paved on a belt in a vibration feeding mode; conveying sludge in a sludge storage bin to a mixing belt and paving the mixture on the upper part of the pulverized coal; conveying the dry and excessively fine carbide slag in the carbide slag storage bin to a mixing belt, and paving the mixture in a groove of sludge; stirring and crushing the mixed material by using a differential wheel set, and conveying the mixed material to a roller mixing stirrer; the roller mixing stirrer is stirred and then is sent to double-stage double-roller rolling forming equipment; the formed sheet-shaped composite desulfurizer is conveyed to a material pool through a belt.
Compared with the prior art, the invention has the following advantages:
according to the invention, the caking property of municipal sludge is utilized to bind the carbide slag, the high-sulfur coal and the sludge together, so that the carbide slag is put into a furnace to realize high-efficiency desulfurization; the water absorption of the dry-state ultrafine carbide slag is utilized to adjust the moisture in the sludge, the problem of large combustion moisture of the sludge entering a furnace is solved under the condition of no need of drying, the prepared composite desulfurizer is used for dry desulfurization in a circulating fluidized bed furnace, the problem of sludge disposal in the actual operation of a sewage treatment plant is solved, the problem of low desulfurization utilization rate in the dry-state ultrafine carbide slag furnace is solved, and the process scheme shown in the attached figure 2 is an effective waste utilization process scheme.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a graph showing the relationship between different charging forms of the dry-state excessively fine carbide slag and the desulfurization efficiency;
FIG. 3 is a graph showing the relationship between different mixing ratios of pulverized coal, sludge and carbide slag and desulfurization efficiency.
Detailed Description
Example 1
Application of municipal sludge in preparation of carbide slag composite desulfurizer
1) High-sulfur coal fine powder with the particle size of less than 3mm falls onto a mixing belt in a vibration feeding mode, the coal powder is spread on the mixing belt through a scraper plate, and the high-sulfur coal fine powder accounts for 35% of the total amount of the composite desulfurizer;
2) Conveying sludge with water content of 83% in the filter-pressed sludge storage bin to a mixing belt, and forming a scraping groove on the surface of the sludge through a toothed scraper; the sludge accounts for 9 percent of the total amount of the composite desulfurizer.
3) Conveying the carbide slag with the water content of 6.3% and the particle size of 0.2mm in the carbide slag storage bin to a mixing belt, and paving the carbide slag in a groove of sludge; the carbide slag accounts for 56 percent of the total amount of the composite desulfurizer.
4) The mixed materials are stirred and crushed by a differential wheel set and are conveyed to a roller mixing stirrer.
5) The roller mixing stirrer is conveyed to a double-stage double-roller rolling forming device after stirring.
6) The formed sheet-shaped composite desulfurizer falls naturally onto a forming belt, a part of the composite desulfurizer is conveyed to a finished product material pool through a coal conveying belt after passing through a coal plough cutter, and a part of the composite desulfurizer is conveyed to the coal conveying belt.
Examples 2 to 10
High-sulfur coal fine powder, dry carbide slag and sludge in different proportions are selected for comparison of desulfurization efficiency in the furnace, and the comparison is shown in the attached figure 3.
As shown in fig. 2, under the same blending ratio, the desulfurization efficiency of the dry-state ultrafine carbide slag is lower than that of the composite desulfurizer, the highest in-furnace desulfurization efficiency of the composite desulfurizer can reach about 90%, and the dry-state carbide slag is only 70%. As shown in FIG. 3, the desulfurization efficiencies of the desulfurization agents charged into the furnace at different mixing ratios were measured, and example 5 corresponds to the highest desulfurization efficiency, which reached 90%.
In conclusion, the embodiment can be seen that the sludge is mixed with the carbide slag and the high-sulfur coal by the binder, so that the carbide slag is efficiently desulfurized after entering the furnace; when the mixing amount of the carbide slag reaches 60%, the desulfurization efficiency in the furnace is 90%, and compared with the condition that the dry-state ultrafine carbide slag is directly fed into the furnace, the desulfurization efficiency is increased by 20%.
Those skilled in the art will appreciate that the invention may be practiced without these specific details. Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (7)
1. The application of the municipal sludge in preparing the carbide slag composite desulfurizer is characterized in that: the municipal sludge with the water content of 80-90 percent is mixed with high-sulfur coal fine powder with the particle size of less than 3mm and dry carbide slag with the water content of less than 7 percent, and then the mixture is molded by double-stage double-roll rolling molding equipment and conveyed to a desulfurization production line.
2. The application of the municipal sludge in the preparation of the carbide slag composite desulfurizer according to claim 1, wherein the municipal sludge comprises the following components in percentage by weight: the composition comprises the following components in percentage by mass: 30-35% of high-sulfur coal fine powder, 55-60% of dry carbide slag and 5-10% of sludge.
3. The application of the municipal sludge in the preparation of the carbide slag composite desulfurizer according to claim 1, wherein the municipal sludge comprises the following components in percentage by weight: the total sulfur content in the high-sulfur coal is more than 3 percent.
4. The application of the municipal sludge in the preparation of the carbide slag composite desulfurizer as claimed in claim 1, is characterized in that: the particle size of the dry carbide slag is less than 0.3mm.
5. The application of the municipal sludge in the preparation of the carbide slag composite desulfurizer according to claim 1, wherein the municipal sludge comprises the following components in percentage by weight: 57% of carbide slag, 35% of high-sulfur coal fine powder and 7% of sludge.
6. The application of the municipal sludge in the preparation of the carbide slag composite desulfurizer according to claim 1, wherein the municipal sludge comprises the following components in percentage by weight: the sludge is the sludge of a secondary sedimentation tank of a sewage treatment plant.
7. The application of the municipal sludge in the preparation of the carbide slag composite desulfurizer according to claim 1, wherein the municipal sludge comprises the following components in percentage by weight: firstly, paving a layer of high-sulfur coal fine powder on a belt in a vibration feeding mode; conveying sludge in a sludge storage bin to a mixing belt, and paving the sludge on the upper part of coal powder; conveying the dry and excessively fine carbide slag in the carbide slag storage bin to a mixing belt, and paving the mixture in a groove of sludge; stirring and crushing the mixed material by using a differential wheel set, and conveying the mixed material to a roller mixing stirrer; the roller mixing stirrer is stirred and then is sent to double-stage double-roller rolling forming equipment; and conveying the formed sheet-shaped composite desulfurizer to a material pool through a belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210891860.3A CN115282765A (en) | 2022-07-27 | 2022-07-27 | Application of municipal sludge in preparation of carbide slag composite desulfurizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210891860.3A CN115282765A (en) | 2022-07-27 | 2022-07-27 | Application of municipal sludge in preparation of carbide slag composite desulfurizer |
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| CN115282765A true CN115282765A (en) | 2022-11-04 |
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| CN202210891860.3A Pending CN115282765A (en) | 2022-07-27 | 2022-07-27 | Application of municipal sludge in preparation of carbide slag composite desulfurizer |
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Citations (6)
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|---|---|---|---|---|
| JP2002243124A (en) * | 2001-02-14 | 2002-08-28 | Mitsubishi Heavy Ind Ltd | Waste material incinerating method using circulated fluidized bed type furnace and device thereof |
| CN1680518A (en) * | 2004-04-09 | 2005-10-12 | 上海精微粉溶机械设备有限公司 | Extra fine mud fuel and production thereof |
| CN104208989A (en) * | 2014-09-12 | 2014-12-17 | 山西平朔煤矸石发电有限责任公司 | Preparation method for mixed desulfurizing agent for circulating fluidized bed boiler |
| CN106281569A (en) * | 2016-08-16 | 2017-01-04 | 安徽盛运重工机械有限责任公司 | A kind of NEW TYPE OF COMPOSITE internal combustion ball-type desulfurizing agent production technology |
| CN214031750U (en) * | 2020-06-03 | 2021-08-24 | 新疆中泰化学股份有限公司 | Environment-friendly device for producing calcium carbide raw material active calcium oxide by using wet-process calcium carbide slag |
| CN113509833A (en) * | 2021-03-25 | 2021-10-19 | 山西大学 | Synchronous desulfurization and denitrification agent in solid waste base furnace and preparation method and application thereof |
-
2022
- 2022-07-27 CN CN202210891860.3A patent/CN115282765A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002243124A (en) * | 2001-02-14 | 2002-08-28 | Mitsubishi Heavy Ind Ltd | Waste material incinerating method using circulated fluidized bed type furnace and device thereof |
| CN1680518A (en) * | 2004-04-09 | 2005-10-12 | 上海精微粉溶机械设备有限公司 | Extra fine mud fuel and production thereof |
| CN104208989A (en) * | 2014-09-12 | 2014-12-17 | 山西平朔煤矸石发电有限责任公司 | Preparation method for mixed desulfurizing agent for circulating fluidized bed boiler |
| CN106281569A (en) * | 2016-08-16 | 2017-01-04 | 安徽盛运重工机械有限责任公司 | A kind of NEW TYPE OF COMPOSITE internal combustion ball-type desulfurizing agent production technology |
| CN214031750U (en) * | 2020-06-03 | 2021-08-24 | 新疆中泰化学股份有限公司 | Environment-friendly device for producing calcium carbide raw material active calcium oxide by using wet-process calcium carbide slag |
| CN113509833A (en) * | 2021-03-25 | 2021-10-19 | 山西大学 | Synchronous desulfurization and denitrification agent in solid waste base furnace and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 岳涛等主编: "《工业锅炉大气污染控制技术与应用》", 中国环境出版社, pages: 266 * |
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