CN116697370A - Device system and method for pretreating and mixing burning of multi-element carbon-containing solid waste - Google Patents
Device system and method for pretreating and mixing burning of multi-element carbon-containing solid waste Download PDFInfo
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- CN116697370A CN116697370A CN202310577462.9A CN202310577462A CN116697370A CN 116697370 A CN116697370 A CN 116697370A CN 202310577462 A CN202310577462 A CN 202310577462A CN 116697370 A CN116697370 A CN 116697370A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000002156 mixing Methods 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 23
- 239000002910 solid waste Substances 0.000 title claims abstract description 22
- 239000010802 sludge Substances 0.000 claims abstract description 121
- 238000001035 drying Methods 0.000 claims abstract description 75
- 238000000197 pyrolysis Methods 0.000 claims abstract description 69
- 239000002028 Biomass Substances 0.000 claims abstract description 62
- 238000002485 combustion reaction Methods 0.000 claims abstract description 46
- 239000003245 coal Substances 0.000 claims abstract description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 59
- 239000003546 flue gas Substances 0.000 claims description 59
- 239000007789 gas Substances 0.000 claims description 34
- 239000000126 substance Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 238000002309 gasification Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 244000052616 bacterial pathogen Species 0.000 description 3
- 238000010344 co-firing Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000002085 persistent effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- 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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
-
- 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
-
- 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
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
-
- 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
- F23G5/46—Recuperation of heat
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The invention provides a device system and a method for pretreating and mixing burning of multi-element carbon-containing solid waste, wherein the device system comprises a chain furnace, a sludge drying device, a sludge pyrolysis device, a biological drying device and a biomass precombustion device; the sludge pyrolysis device and the biomass precombustion device are respectively connected with the chain furnace; the sludge drying device and the sludge pyrolysis device are arranged in series; the biological drying device and the biomass precombustion device are arranged in series. According to the method, sludge is subjected to drying treatment and then pyrolysis, and pyrolysis gas is combusted in a hearth of a chain furnace, so that the influence of directly mixing and combusting the sludge on the temperature of the hearth is reduced; simultaneously, the biomass is sent into the middle part of a hearth of the chain furnace after being precombusted, so that high-temperature combustion flame can be formed; and the reasonable air distribution is carried out, so that the burning and burnout of the low-volatile coal-based fuel is promoted, the complexity of tail gas treatment is reduced, and the application prospect is wide.
Description
Technical Field
The invention relates to the technical field of boiler co-firing, in particular to a device system and a method for multi-element carbon-containing solid waste pretreatment co-firing.
Background
The amount of sewage discharged in cities is increasing, and a large amount of sludge is generated after the sewage is subjected to corresponding purification treatment. The sludge itself has a certain calorific value and the yield is as high as tens of millions of tons per year. This portion of sludge has potential energy utilization value. The wet sludge has high moisture content and low external heat release amount due to combustion per unit mass, and the direct blending combustion of the sludge tends to reduce the combustion temperature of a hearth, so that the combustion instability is caused, the carbon content of ash is increased, and the boiler efficiency is reduced, so that the sludge is difficult to treat on a large scale by direct blending combustion in a coal-fired furnace.
CN111362551a discloses a two-stage sludge drying and incinerating system and operation method of a coal-fired power plant, which comprises a heat pump system, wherein the heat pump system comprises a heater for heating gas and then sending the heated gas into the sludge drying system, a gas inlet and a gas outlet are arranged on the heater, the gas outlet of the heater is connected with the sludge drying system, the heater is connected with a coal-fired boiler through a heat source pipe, and the heat source pipe is used for transmitting heat in the coal-fired boiler into the heater. Through the arrangement of the steam incoming pipe, the flue gas incoming pipe and the hot water incoming pipe, operators can flexibly select according to the actual running condition of the boiler, the waste heat and the heat source of the coal-fired boiler are fully and efficiently utilized, the heat of the boiler is efficiently utilized, the energy consumption of sludge drying is effectively reduced, and the cost of sludge drying is reduced.
CN111623352a discloses a system and a method for pyrolysis and self-sustaining incineration of low-calorific-value high-ash sludge, wet sludge is conveyed into a rotary pyrolysis furnace from a spiral, mixed with high-temperature slag discharged through an incineration grate slag pipe and subjected to high-temperature pyrolysis, and the sludge after pyrolysis is directly conveyed to a storage bin and then is burnt in the furnace. Part of flue gas is led back to the tail waste heat boiler to enter the rotary pyrolysis furnace, and pyrolysis gas generated by sludge under the conditions of high-temperature slag and inert flue gas is sent into the incinerator for co-combustion. The high-temperature air preheater at the tail part heats air and then sends the air into the furnace to be combusted, so that the self-sustaining combustion of the low-heat-value high-ash sludge is ensured. The high-temperature slag is used as a low-heat-value sludge drying pyrolysis heat source, so that the water content of the sludge is effectively reduced, and the heat value of the sludge is increased. In addition, the tail flue gas is used as pyrolysis atmosphere and generated pyrolysis gas is introduced into the incinerator, so that the problem that the pyrolysis gas is difficult to treat is solved by using the heat value of the pyrolysis gas, and the generation of pollutants in the combustion process is effectively reduced.
However, the above-mentioned method of sludge drying and incineration is not suitable for a chain furnace. The chain furnace is small in size, and the coal seam ignition on the chain mainly depends on the flame radiation in the center of a hearth and the radiation of a furnace wall, so that the ignition characteristic is inferior to that of a pulverized coal furnace, and when the volatile content of coal is low and the ignition point is higher, the ignition can be more difficult.
Therefore, it is of great significance to develop a device system and a method for pretreating and mixing burning of multiple carbon-containing solid wastes, which are suitable for a chain furnace.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a device system and a method for pretreating and mixing burning of multi-element carbon-containing solid waste, which are characterized in that sludge is subjected to drying treatment and then pyrolysis, pyrolysis gas is burnt in a hearth of a chain furnace, and the influence of directly mixing burning sludge on the temperature of the hearth is reduced; simultaneously, the biomass is sent into the middle part of a hearth of the chain furnace after being precombusted, so that high-temperature combustion flame can be formed; and the reasonable air distribution is carried out, so that the burning and burnout of the low-volatile coal-based fuel is promoted, and the complexity of tail gas treatment is reduced.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device system for pretreating and mixing combustion of multi-element carbon-containing solid waste, wherein the device system comprises a chain furnace, a sludge drying device, a sludge pyrolysis device, a biological drying device and a biomass precombustion device;
the sludge pyrolysis device and the biomass precombustion device are respectively connected with the chain furnace;
the sludge drying device and the sludge pyrolysis device are arranged in series;
the biological drying device and the biomass precombustion device are arranged in series.
The device system for pretreating and mixing the multi-element carbon-containing solid waste utilizes medium-high temperature flue gas of a chain furnace to carry out drying and pyrolysis treatment on the sludge, and decouples the processes of heat absorption and heat release of sludge drying. Although the overall heat release amount of the sludge is unchanged, the energy density of the fuel fed into the hearth of the chain furnace is high due to the enrichment of pyrolysis gas in the pyrolysis process; and the energy of pyrolysis gas per unit mass is tens times of that of wet sludge, so that the furnace temperature is not affected when the pyrolysis gas is fed into a hearth, and the aim of large-scale sludge digestion is fulfilled. The invention also utilizes the characteristics of easy ignition and quick reaction rate of biomass, the biomass which is burnt in the precombustion way by the biomass precombustion device is fed into the middle area of the hearth of the chain furnace, high-temperature flame is formed in the middle of the hearth, and the heat radiation to the coal bed at the bottom of the chain furnace is enhanced, so that the ignition of low-volatile coal is easier and the combustion is more complete.
Preferably, the chain grate furnace is connected with the sludge pyrolysis device through a first flue gas pipeline.
In the invention, the first flue gas is in indirect contact with organisms to exchange heat, and the sludge absorbs heat to carry out pyrolysis.
Preferably, the sludge pyrolysis device is connected with the bottom of the chain furnace through a pyrolysis gas pipeline.
Preferably, the sludge pyrolysis device is connected to a solidified residue discharge pipe.
Preferably, an overfire air duct is arranged on one side of the top of the chain furnace.
Preferably, a secondary air pipeline is arranged above the fire grate of the chain furnace.
Preferably, the bottom of the chain grate furnace is provided with a combustion air duct.
According to the invention, through reasonably configuring the combustion air pipeline, the secondary air pipeline and the over-fire air pipeline, a reducing atmosphere is formed in the chain furnace, and the generation of combustion pollutants is reduced. Compared with the scheme that the chain furnace in the prior art is only provided with a primary air pipeline or a secondary air pipeline is arranged in the middle of a hearth, the combustion efficiency of the chain furnace is higher.
Preferably, one side of the chain grate furnace is provided with a coal inlet.
Preferably, an air preheating device is arranged in a flue of the chain grate furnace.
Preferably, the air preheating device is connected to a preheated air duct.
Preferably, a second flue gas pipeline is arranged in the middle of the chain furnace.
Preferably, the biomass precombustion device is arranged in the middle of the chain furnace.
Preferably, the second flue gas pipeline is connected with a biological drying device.
In the invention, the second flue gas is in indirect contact with organisms to exchange heat.
Preferably, the biological drying device is further connected with the biomass conveying pipeline, the first steam pipeline and the third flue gas pipeline respectively.
Preferably, the preheated air duct is connected to a biomass precombustion device.
In the invention, preheated air is directly contacted with the dried biomass to carry out gasification pre-combustion.
Preferably, the sludge drying device is connected with a third flue gas pipeline.
In the invention, the third flue gas is in indirect contact with the sludge for heat exchange.
Preferably, the sludge drying device is further connected with the sludge conveying pipeline, the second steam pipeline and the residual flue gas pipeline respectively.
In a second aspect, the present invention also provides a method for pretreating and blending combustion of multiple carbon-containing solid wastes, wherein the method is performed by using the device system for pretreating and blending combustion of multiple carbon-containing solid wastes according to the first aspect; the method comprises the following steps:
the second flue gas generated by the chain furnace enters a biological drying device to exchange heat with biomass and then becomes third flue gas, the third flue gas enters a sludge drying device to dry sludge, and the third flue gas becomes residual flue gas to be discharged;
the biomass dried in the biological drying device sequentially enters the biomass precombustion device and the chain furnace to promote ignition of a coal bed on the chain furnace;
the sludge dried in the sludge drying device enters the sludge pyrolysis device and contacts with first smoke generated by the chain furnace, and pyrolysis gas is generated and enters the chain furnace for combustion.
In the method for pretreating and blending combustion of the multi-element carbon-containing solid waste, sludge is subjected to drying and pyrolysis treatment, biomass is subjected to precombustion, control of heavy metals, pathogenic bacteria and persistent organic matters is facilitated, excessive pollutants are prevented from being generated in the flue gas of the hearth of the chain furnace, and the complexity of tail gas treatment is reduced. The invention adopts the flue gas heat energy cascade utilization technology, is favorable for maintaining the full combustion of fuel in the chain furnace, improves the combustion efficiency of the boiler, and further improves the overall energy utilization efficiency.
Preferably, the coal is combusted by entering the chain furnace through a coal inlet.
Preferably, the biomass enters the biological drying device through the biomass conveying pipeline to be dried, and then generates first vapor, and the first vapor is discharged through the first vapor pipeline.
Preferably, the preheated air generated by the air preheating device in the flue of the chain furnace enters the biomass precombustion device through a preheated air pipeline for gasification precombustion.
Preferably, the sludge enters the sludge drying device through the sludge conveying pipeline to be dried, and then generates second vapor, and the second vapor is discharged through the second vapor pipeline.
Preferably, the dried sludge enters a sludge pyrolysis device to generate solidified residues, and the solidified residues are discharged through a solidified residue discharge pipeline.
Preferably, the pyrolysis gas and the combustion air enter a chain furnace, and a reducing atmosphere is formed in a coal bed combustion area of the chain furnace; and then, secondary air is blown into the upper part of the grate of the chain furnace through a secondary air pipeline, so that combustible substances in the reducing atmosphere continue to burn, and finally, the combustible substances are burned out at the top of the chain furnace through the overfire air conveyed through the overfire air pipeline.
The temperature of the first flue gas is preferably 450 to 600 ℃, and may be, for example, 450 ℃, 480 ℃, 500 ℃, 550 ℃, 570 ℃, 600 ℃, or the like, but is not limited to the values listed, and other values not listed in the range are equally applicable.
The temperature of the second flue gas is preferably 300 to 400 ℃, and may be 300 ℃, 320 ℃, 350 ℃, 370 ℃, 390 ℃, 400 ℃ or the like, for example, but is not limited to the recited values, and other non-recited values within the range of the recited values are equally applicable.
The temperature of the third flue gas is preferably 150 to 250 ℃, and may be, for example, 150 ℃, 190 ℃, 200 ℃, 220 ℃, 240 ℃, 250 ℃, or the like, but is not limited to the values listed, and other values not listed in the range are equally applicable.
The temperature of the preheated air is preferably 60 to 120 ℃, and may be 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 120 ℃ or the like, for example, but is not limited to the values recited, and other values not recited in the range are equally applicable.
As a preferred technical solution of the present invention, the method includes:
the fire coal enters a chain furnace through a fire coal inlet for combustion, biomass enters a biological drying device for drying through a biomass conveying pipeline, and sludge enters a sludge drying device for drying through a sludge conveying pipeline;
the second flue gas with the temperature of 300-400 ℃ generated by the chain furnace enters a biological drying device to exchange heat with biomass, and then the third flue gas with the temperature of 150-250 ℃ enters a sludge drying device to dry sludge, and the third flue gas is changed into residual flue gas to be discharged;
the first vapor generated by the biological drying device is discharged through a first vapor pipeline;
the second vapor generated by the sludge drying device is discharged through a second vapor pipeline;
the sludge dried in the sludge drying device enters a sludge pyrolysis device, contacts with first flue gas which is generated by a chain furnace and has the temperature of 450-600 ℃, and generates pyrolysis gas which enters the chain furnace through a pyrolysis gas pipeline to be combusted together with combustion air; the solidified residues generated by the sludge pyrolysis device are discharged through a solidified residue discharge pipeline;
the biomass dried in the biological drying device enters the biomass precombustion device, preheated air with the temperature of 60-120 ℃ discharged by the air preheating device arranged in the flue of the chain furnace enters the biomass precombustion device through a preheated air pipeline, so that biomass gasification precombustion is realized, and finally the biomass is sent into the middle part of a hearth to promote ignition of a coal bed on the chain furnace.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) The device system for pretreating and mixing the multi-element carbon-containing solid waste generates pyrolysis gas after drying and pyrolyzing the sludge, and burns the pyrolysis gas in the hearth of the chain furnace, so that the device system has no obvious influence on the temperature of the hearth and is beneficial to the digestion of more proportion of sludge; the biomass is sent into the middle part of the hearth after being pre-burnt, which is favorable for forming high-temperature combustion flame, and reasonable air distribution is adopted to promote the combustion burnout of low-volatile coal-based fuel;
(2) The method for pretreating and mixing the multi-element carbon-containing solid waste does not need to strictly control the water content of the sludge and the biomass, and reduces the complex control characteristic of a solid feeding mechanism;
(3) Compared with direct combustion of sludge, the method for pretreating and mixing combustion of the multi-element carbon-containing solid waste in the hearth of the chain furnace is beneficial to controlling heavy metals, pathogenic bacteria and persistent organic matters, avoids generating excessive pollutants in the flue gas of the hearth, and reduces the complexity of tail gas treatment.
Drawings
FIG. 1 is a schematic diagram of a system of a device for pretreating and co-firing multiple carbon-containing solid wastes.
In the figure: 1-a chain furnace; 2-a sludge conveying pipeline; 3-a sludge drying device; 4-a sludge pyrolysis device; 5-a biomass precombustion device; 6-a biomass drying device; 7-a coal inlet; 8-biomass conveying pipelines; 9-a first flue gas duct; 10-a second flue gas duct; 11-a preheated air duct; 12-a pyrolysis gas duct; 13-a third flue gas duct; 14-a first water vapor conduit; 15-a residual flue gas duct; 16-a solidified residue discharge pipe; 17-a secondary air pipeline; 18-an overfire air duct; 19-a second water vapor conduit.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
The present invention will be described in further detail below. The following examples are merely illustrative of the present invention and are not intended to represent or limit the scope of the invention as defined in the claims.
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
As one embodiment of the invention, a device system for pretreating and mixing burning of multi-element carbon-containing solid waste is provided, and the structure schematic diagram of the device system is shown in figure 1.
The device system comprises a chain furnace 1, a sludge drying device 3, a sludge pyrolysis device 4, a biological drying device 6 and a biomass precombustion device 5;
the sludge pyrolysis device 4 and the biomass precombustion device 5 are respectively connected with the chain furnace 1;
the sludge drying device 3 and the sludge pyrolysis device 4 are arranged in series;
the biological drying device 6 and the biomass precombustion device 5 are arranged in series.
The chain furnace 1 is connected with the sludge pyrolysis device 4 through a first flue gas pipeline 9;
the sludge pyrolysis device 4 is connected with the bottom of the chain furnace 1 through a pyrolysis gas pipeline 12;
the sludge pyrolysis device 4 is connected to a solidified residue discharge pipe 16.
An overfire air pipeline 18 is arranged on one side of the top of the chain furnace 1;
a secondary air pipeline 17 is arranged above the fire grate of the chain furnace 1;
a coal inlet 7 is formed in one side of the chain furnace 1;
the bottom of the chain grate furnace 1 is provided with a combustion air pipeline.
An air preheating device is arranged in a flue of the chain furnace 1;
the air preheating device is connected with a preheated air pipeline 11;
the middle part of the chain grate furnace 1 is provided with a second flue gas pipeline 10.
The second flue gas pipeline 10 is connected with the biological drying device 6;
the biological drying device 6 is also respectively connected with a biomass conveying pipeline 8, a first steam pipeline 14 and a third flue gas pipeline 13;
the preheated air duct 11 is connected to the biomass precombustion device 5.
The sludge drying device 3 is connected with a third flue gas pipeline 13;
the sludge drying device 3 is also respectively connected with the sludge conveying pipeline 2, the second steam pipeline 19 and the residual flue gas pipeline 15.
As a specific embodiment of the invention, a method for pretreating and blending combustion of the multi-element carbon-containing solid waste is also provided, and the method is carried out by adopting the device system for pretreating and blending combustion of the multi-element carbon-containing solid waste; the method comprises the following steps:
the fire coal enters a chain furnace through a fire coal inlet for combustion, biomass enters a biological drying device for drying through a biomass conveying pipeline, and sludge enters a sludge drying device for drying through a sludge conveying pipeline;
the second flue gas with the temperature of 350 ℃ generated by the chain furnace enters a biological drying device to exchange heat with biomass, and then the third flue gas with the temperature of 250 ℃ enters a sludge drying device to dry sludge, and the third flue gas is changed into residual flue gas to be discharged;
the first vapor generated by the biological drying device is discharged through a first vapor pipeline;
the second vapor generated by the sludge drying device is discharged through a second vapor pipeline;
the sludge dried in the sludge drying device enters a sludge pyrolysis device, contacts with first flue gas which is generated by a chain furnace and has the temperature of 600 ℃, and generates pyrolysis gas which enters the chain furnace through a pyrolysis gas pipeline to be combusted together with combustion air; the solidified residues generated by the sludge pyrolysis device are discharged through a solidified residue discharge pipeline;
the biomass dried in the biological drying device enters the biomass precombustion device, preheated air with the temperature of 100 ℃ discharged by the air preheating device arranged in the flue of the chain furnace enters the biomass precombustion device through a preheated air pipeline, so that biomass gasification precombustion is realized, and finally the biomass is sent to the middle part of a hearth to promote ignition of a coal bed on the chain furnace.
In summary, the device system for pretreating and mixing burning of the multi-element carbon-containing solid waste provided by the invention dries and pyrolyzes the sludge to generate pyrolysis gas, and the pyrolysis gas is burnt in the hearth of the chain furnace, so that the temperature of the hearth is not obviously influenced, and the device system is beneficial to the consumption of sludge with more proportion; the biomass is sent into the middle part of the hearth after being pre-burnt, which is favorable for forming high-temperature combustion flame, and reasonable air distribution is adopted to promote the combustion burnout of low-volatile coal-based fuel; the method does not need to strictly control the water content of the sludge and the biomass, and reduces the complex control characteristic of a solid feeding mechanism; compared with direct combustion of sludge, the combustion pyrolysis gas is beneficial to controlling heavy metals, pathogenic bacteria and persistent organic matters, avoids generating excessive pollutants in hearth smoke, reduces the complexity of tail gas treatment, and is suitable for large-scale popularization and application.
The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.
Claims (10)
1. The device system for pretreating and mixing the multi-element carbon-containing solid waste is characterized by comprising a chain furnace, a sludge drying device, a sludge pyrolysis device, a biological drying device and a biomass precombustion device;
the sludge pyrolysis device and the biomass precombustion device are respectively connected with the chain furnace;
the sludge drying device and the sludge pyrolysis device are arranged in series;
the biological drying device and the biomass precombustion device are arranged in series.
2. The plant system of claim 1, wherein the chain grate furnace is connected to a sludge pyrolysis plant via a first flue gas duct;
preferably, the sludge pyrolysis device is connected with the bottom of the chain furnace through a pyrolysis gas pipeline;
preferably, the sludge pyrolysis device is connected to a solidified residue discharge pipe.
3. The plant arrangement according to claim 1 or 2, characterized in that the top side of the chain grate furnace is provided with an overfire air duct;
preferably, a secondary air pipeline is arranged above the fire grate of the chain furnace;
preferably, one side of the chain grate furnace is provided with a coal inlet;
preferably, the bottom of the chain grate furnace is provided with a combustion air duct.
4. A plant system according to any one of claims 1 to 3, wherein an air preheating device is provided in the flue of the chain furnace;
preferably, the air preheating device is connected with a preheated air pipeline;
preferably, a second flue gas pipeline is arranged in the middle of the chain furnace;
preferably, the biomass precombustion device is arranged in the middle of the chain furnace.
5. The system of any one of claims 1-4, wherein the second flue gas duct is connected to a biological drying device;
preferably, the biological drying device is further connected with the biomass conveying pipeline, the first steam pipeline and the third flue gas pipeline respectively;
preferably, the preheated air duct is connected to a biomass precombustion device.
6. The system of any one of claims 1 to 5, wherein the sludge drying device is connected to a third flue gas duct;
preferably, the sludge drying device is further connected with the sludge conveying pipeline, the second steam pipeline and the residual flue gas pipeline respectively.
7. A method for pretreating and blending combustion of multi-element carbon-containing solid waste, which is characterized in that the method is carried out by adopting the device system for pretreating and blending combustion of multi-element carbon-containing solid waste according to any one of claims 1-6; the method comprises the following steps:
the second flue gas generated by the chain furnace enters a biological drying device to exchange heat with biomass and then becomes third flue gas, the third flue gas enters a sludge drying device to dry sludge, and the third flue gas becomes residual flue gas to be discharged;
the biomass dried in the biological drying device sequentially enters the biomass precombustion device and the chain furnace to promote ignition of a coal bed on the chain furnace;
the sludge dried in the sludge drying device enters the sludge pyrolysis device and contacts with first smoke generated by the chain furnace, and pyrolysis gas is generated and enters the chain furnace for combustion.
8. The method of claim 7, wherein the coal is combusted by entering the chain furnace through a coal inlet;
preferably, the biomass enters the biological drying device through a biomass conveying pipeline to be dried, and then generates first vapor, and the first vapor is discharged through the first vapor pipeline;
preferably, preheated air generated by an air preheating device in a flue of the chain furnace enters a biomass precombustion device through a preheated air pipeline to be gasified and precombusted;
preferably, the sludge enters a sludge drying device through a sludge conveying pipeline to be dried, and then generates second vapor, and the second vapor is discharged through a second vapor pipeline;
preferably, the dried sludge enters a sludge pyrolysis device to generate solidified residues, and the solidified residues are discharged through a solidified residue discharge pipeline.
9. The method of claim 7 or 8, wherein the pyrolysis gas and combustion air enter a chain grate furnace to form a reducing atmosphere in a coal seam combustion zone of the chain grate furnace; and then, secondary air is blown into the upper part of the grate of the chain furnace through a secondary air pipeline, so that combustible substances in the reducing atmosphere continue to burn, and finally, the combustible substances are burned out at the top of the chain furnace through the overfire air conveyed through the overfire air pipeline.
10. The method according to any one of claims 7 to 9, wherein the temperature of the first flue gas is 450 to 600 ℃;
preferably, the temperature of the second flue gas is 300-400 ℃;
preferably, the temperature of the third flue gas is 150-250 ℃;
preferably, the temperature of the preheated air is 60-120 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310577462.9A CN116697370A (en) | 2023-05-22 | 2023-05-22 | Device system and method for pretreating and mixing burning of multi-element carbon-containing solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310577462.9A CN116697370A (en) | 2023-05-22 | 2023-05-22 | Device system and method for pretreating and mixing burning of multi-element carbon-containing solid waste |
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| CN116697370A true CN116697370A (en) | 2023-09-05 |
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| CN202310577462.9A Pending CN116697370A (en) | 2023-05-22 | 2023-05-22 | Device system and method for pretreating and mixing burning of multi-element carbon-containing solid waste |
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| CN (1) | CN116697370A (en) |
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