CN111006223A - Chimney-free sludge incineration method - Google Patents
Chimney-free sludge incineration method Download PDFInfo
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- CN111006223A CN111006223A CN201911046438.2A CN201911046438A CN111006223A CN 111006223 A CN111006223 A CN 111006223A CN 201911046438 A CN201911046438 A CN 201911046438A CN 111006223 A CN111006223 A CN 111006223A
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- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- Treating Waste Gases (AREA)
Abstract
A chimney-free sludge incineration method comprises the following steps: (1) independently burning sludge in a sewage plant, and purifying the burned flue gas; (2) pressurizing the purified flue gas by using an induced draft fan, and conveying the flue gas to a biological reaction tank at a sewage treatment end of a sewage plant by using a pipeline; (3) gas distribution pipes are uniformly arranged along the bottom of the tank body of the biological reverse tank, and the flue gas is introduced into the reaction tank through the gas distribution pipes; (4) and carrying out tail gas collection and deodorization treatment on the flue gas introduced into the biological reaction tank. The method has the advantages of multiple advantages, strong innovation and very large engineering application value, and on one hand, the sewage is utilized to purify the sludge incineration flue gas, so that a chimney is not needed for sludge incineration, zero emission of the flue gas is realized, and the environmental effect of the sludge incineration project is greatly improved; on the other hand, the heat energy generated by the incineration of organic matters in the sludge can be utilized to heat the sewage, thereby promoting the biological treatment of the sewage. The sewage sludge odor is subjected to synergistic treatment, so that the sustainable sewage treatment concept of low carbon, energy conservation, environmental protection is truly embodied.
Description
Technical Field
The invention relates to the technical field of sewage and sludge treatment and environmental protection, in particular to a chimney-free sludge incineration method.
Background
With the continuous improvement of the effluent quality requirements of sewage plants, the amount of sludge produced is also increased, and the treatment and disposal of the sludge is an urgent need in the sewage treatment field of China. Among the numerous sludge treatment processes, incineration technology exhibits unique advantages in that it destroys all organic matter, kills all pathogens, and minimizes sludge volume. Meanwhile, the sludge incineration is a direct mode of utilizing the organic heat value of the sludge, the sludge incineration is treated by utilizing the self heat value, and the energy recycling and sustainable development concept is embodied. In view of the advantages of reduction and harmlessness of sludge incineration treatment, the method is a mainstream process of sludge treatment, and in recent years, the urban area of a large city is taken as a representative, and more sludge incineration projects are provided, so that a good reference is provided for selection of sludge outlet of sewage plants in cities and towns in China.
Certainly, the sludge is used as a solid, the incineration treatment inevitably has the problem of smoke emission, and although the treated smoke generally reaches the standard, the towering emission chimney is not coordinated with the surrounding environment, and the towering emission chimney has adverse effects on surrounding residents in sense and psychology. Therefore, a process technology should be actively sought, a sludge incineration tail gas emission chimney is eliminated, and an effort is made to coordinate and merge a sludge incineration treatment plant and the surrounding environment.
In a sewage plant adopting a sludge drying and incineration process, sewage is a valuable resource, and a new process and a new method are actively sought, and the sewage is used for purifying and treating the flue gas generated by sludge incineration. Meanwhile, the burned flue gas contains heat, and a method for utilizing the organic heat energy of the sewage sludge is tried to be explored, so that the waste gas is reused for sewage treatment, and the sewage treatment effect is improved. The temperature has obvious influence on the degradation and removal of pollutants in the sewage, particularly has great influence on the nitrification and denitrification effects, for example, the specific growth rate and the denitrification rate of nitrifying bacteria are respectively reduced by 10 percent and 9 percent when the temperature is reduced by 1 ℃. At present, in many sewage treatment plants adopting an activated sludge method, the water inlet temperature is reduced in winter, especially in northern cold areas, the removal rate of various pollutants is greatly reduced when the environmental temperature is minus dozens of DEG C in winter, and the quality of the effluent water in winter is difficult to reach the standard.
Therefore, the sludge incineration tail gas can be purified by utilizing the sewage treatment biochemical reaction, the emission of the incineration tail gas is reduced to the maximum extent, the biochemical reaction is promoted by utilizing the organic matter heat energy of the sludge, two purposes are achieved by one stroke, and the method has great engineering application value.
Disclosure of Invention
The invention aims to provide a chimney-free sludge incineration method, which purifies sludge incineration flue gas by using sewage and further cancels a sludge incineration tail gas discharge chimney.
In order to achieve the purpose, the technical scheme of the invention is as follows: a chimney-free sludge incineration method is characterized by comprising the following steps:
(1) separately burning sludge in a sewage plant, purifying the burned flue gas, and keeping the temperature of the flue gas in a proper range;
(2) pressurizing the purified flue gas by using an induced draft fan, and conveying the flue gas to a biological reaction tank at a sewage treatment end of a sewage plant by using a pipeline;
(3) gas distribution branch pipes are uniformly arranged along the bottom of the tank body of the biological reverse tank, and the flue gas is introduced into the reaction tank to directly heat and stir the sewage;
(4) purifying the smoke pollutants in a biological reaction tank;
(5) and collecting tail gas of the flue gas introduced into the biological reaction tank, and sending the flue gas into a deodorization device of the biological reaction tank for deodorization treatment.
Laying a main pipe along the bottom of the middle part of the tank body of the biological reverse tank, wherein the main pipe is connected with an induced draft fan through a pipeline, gas distribution branch pipes are connected to two sides of the main pipe, nozzles are installed at the tops of the gas distribution branch pipes, and flue gas is sprayed into the reaction tank through the nozzles after passing through the main pipe and the gas distribution branch pipes to be mixed with gas and water.
According to the method for incinerating sludge without chimney, the flue gas generated after the sludge incineration is purified by using the sewage, and the tail gas generated after the sludge incineration is cancelled to be discharged into the chimney; meanwhile, organic matter energy of the sludge is utilized and reused for sewage treatment.
The purified flue gas needs to meet the current emission standard requirements of domestic waste incineration atmospheric pollutants in China and places, and adverse effects on biochemical reaction of front-end sewage caused by high content of flue gas pollutants are avoided;
the flue gas after purification treatment, especially the flue gas after wet washing, can be maintained at about 40-50 ℃, and adverse effects on biochemical reaction of front-end sewage caused by overhigh flue gas temperature can be avoided.
The pressure of the flue gas after the flue gas is pressurized by the draught fan is required to be maintained within the range of 0.10-0.20 MPa when the flue gas enters the biological reaction tank;
the smoke introduced into the biological reaction tank is removed through the metabolism of microorganisms, the adsorption of activated sludge zoogloea and the like. Wherein the smoke particles are removed by the adsorption of zoogloea; sulfur dioxide is dissolved in the sewage and is removed by neutralization reaction with alkaline substances; the nitrogen oxides are finally reduced to nitrogen to the atmosphere by biological denitrification.
The flue gas introduced into the raw anti-pool can be treated by a primary anti-pool deodorization system after being collected and then discharged.
The process scheme provided by the invention is parallel to the main sewage treatment and sludge incineration process, and has the advantages of less equipment, simplicity and high efficiency. The purification treatment of the sludge incineration flue gas by the sewage is realized through less investment, and a sludge incineration tail gas discharge chimney is omitted; meanwhile, when the water amount of the sewage plant is large, part of the flue gas treatment process can be properly cancelled, the purification efficiency of sewage treatment is fully utilized, the aim of saving the investment of flue gas treatment equipment is fulfilled, and the sewage treatment plant is environment-friendly and economical. On the other hand, the water temperature of the biological reaction tank is improved through direct contact of flue gas and water, and the heat energy generated by burning the sludge organic matters is recovered and is used for promoting the biochemical reaction of sewage treatment. The process method provided by the invention can realize the complete elimination of the sludge incineration tail gas discharge chimney, and greatly improve the environmental and economic benefits of the sludge incineration project; the process method provided by the invention also provides a better solution for normal operation of the sewage plant in the cold area in winter, fully embodies the concepts of cooperation, low carbon, energy conservation and sustainable development of the sewage and sludge treatment system, and has very strong innovation and practicability.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described in detail below with reference to the following figures and detailed description.
As shown in figure 1, a sludge incineration method without chimney is mainly characterized in that high-temperature flue gas generated by sludge incineration is treated by a flue gas treatment system, then is pressurized and conveyed to a biological reaction tank, and is purified by biochemical reaction in the biological reaction tank, so that a sludge incineration flue gas discharge chimney is eliminated.
In this example, the scale of the sewage treatment plant is 40 km3And d, sludge is treated by adopting a drying and incinerating process, and incinerating facilities are intensively arranged in a sewage plant. The sludge incineration flue gas purification adopts a treatment process of SNCR, electrostatic dust removal, dry deacidification, cloth bag dust removal, wet deacidification and physical adsorption, the treated flue gas meets the requirements of the domestic garbage incineration atmospheric pollutant emission standard (DB31/768-2013), and the specific indexes are shown in the following table.
TABLE 1 flue gas emission Standard Table
After the flue gas is treated, the temperature is 50 ℃, a draught fan is used for pressurizing, and the pressure after pressurization is 0.10 MPa. The biological reaction tanks are divided into 4 groups, and the flue gas is connected into each biological reaction tank body through 4 DN150 pipelines. The main pipe is laid along the bottom of the middle part of the tank body, the two sides of the main pipe are connected with branch pipes, nozzles are installed at the tops of the branch pipes, and flue gas is sprayed into the reaction tank through the nozzles to be mixed with gas and water. In this example, the biological reaction pond adopts wholly to cover the deodorization, and the letting in of flue gas has increased the deodorization amount of wind, reaches whole deodorant purpose through suitably increasing deodorization equipment scale.
In this example, the total amount of sludge incineration flue gas is 2880000m3To sulfur dioxide (SO)2) In terms of index, the daily average emission limit is 50mg/Nm3According to SO in flue gas after contact2Calculating SO when all the wastewater is dissolved in the raw and reverse tanks2The concentration increase value is 0.43 mg/L; to Nitrogen Oxide (NO)x) For the index, the daily average emission limit is 200mg/Nm3According to NO in flue gas after contactxCalculating the total dissolved in the raw reverse pool sewage, NOxThe concentration increase is 1.73mgAnd L. The influence of the introduction of the visible smoke on the quality of the sewage is very small, and the biochemical reaction is not influenced.
The above-mentioned embodiments are not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the scope of the present invention.
Claims (4)
1. A chimney-free sludge incineration method is characterized by mainly comprising the following steps:
(1) separately burning sludge in a sewage plant, purifying the burned flue gas, and keeping the temperature of the flue gas in a proper range;
(2) pressurizing the purified flue gas by using an induced draft fan, and conveying the flue gas to a biological reaction tank at a sewage treatment end of a sewage plant by using a pipeline;
(3) gas distribution branch pipes are uniformly arranged along the bottom of the tank body of the biological reverse tank, and the flue gas is introduced into the reaction tank to directly heat and stir the sewage;
(4) purifying the smoke pollutants in a biological reaction tank;
(5) and collecting tail gas of the flue gas introduced into the biological reaction tank, and sending the flue gas into a deodorization device of the biological reaction tank for deodorization treatment.
2. The method of claim 1, wherein the flue gas purified by the multi-stage process, especially the flue gas subjected to wet scrubbing, is maintained at about 40-50 ℃, thereby avoiding adverse effects on the biochemical reaction of the front-end sewage due to the excessively high temperature of the flue gas.
3. The method for sludge incineration without chimney according to claim 1, characterized in that the flue gas introduced into the biological reaction tank is removed by microbial metabolism and activated sludge zoogloea adsorption, wherein flue gas particulate matter is removed by zoogloea adsorption; sulfur dioxide is dissolved in the sewage and is removed by neutralization reaction with alkaline substances; the nitrogen oxides are finally reduced to nitrogen to the atmosphere by biological denitrification.
4. The method of claim 1, wherein the pressure of the flue gas after the flue gas is introduced into the biological reaction tank is maintained within the range of 0.10 to 0.20 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911046438.2A CN111006223A (en) | 2019-10-30 | 2019-10-30 | Chimney-free sludge incineration method |
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| CN201911046438.2A CN111006223A (en) | 2019-10-30 | 2019-10-30 | Chimney-free sludge incineration method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579599A (en) * | 2009-03-30 | 2009-11-18 | 宝鸡阜丰生物科技有限公司 | Novel process for treating fermentation waste gas of amino acid by utilizing biofilter |
| CN103100293A (en) * | 2011-11-10 | 2013-05-15 | 中国石油化工股份有限公司 | Process method for flue gas denitrification through biological method |
| CN108613198A (en) * | 2018-02-09 | 2018-10-02 | 刘学琳 | A kind of sludge incineration flue gas treating process |
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- 2019-10-30 CN CN201911046438.2A patent/CN111006223A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579599A (en) * | 2009-03-30 | 2009-11-18 | 宝鸡阜丰生物科技有限公司 | Novel process for treating fermentation waste gas of amino acid by utilizing biofilter |
| CN103100293A (en) * | 2011-11-10 | 2013-05-15 | 中国石油化工股份有限公司 | Process method for flue gas denitrification through biological method |
| CN108613198A (en) * | 2018-02-09 | 2018-10-02 | 刘学琳 | A kind of sludge incineration flue gas treating process |
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