CN111237777A - Device and method for mixed sludge burning of medium-speed coal mill - Google Patents
Device and method for mixed sludge burning of medium-speed coal mill Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 212
- 239000010802 sludge Substances 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003546 flue gas Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 abstract description 8
- 238000009841 combustion method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 4
- 210000005239 tubule Anatomy 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010344 co-firing Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
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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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
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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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/80—Shredding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention relates to a device for mixed combustion of sludge by a medium-speed coal mill, which comprises: the device comprises a sludge pool, a filter screen, a plunger pump, a coal mill sludge electric isolation valve, a medium-speed coal mill, a coal feeder outlet electric valve, a coal dropping pipe inner sleeving pipe, a related connecting pipeline and a circular sleeve. The invention has the beneficial effects that: the core problem that the blockage of a pulverizing system is easily caused by directly mixing and burning sludge in the pulverizing system is technically solved by combining the structural characteristics of a coal dropping pipe on a medium-speed coal mill; the problem of odor overflow in the sludge conveying and drying process is solved; the coal mill is also used as sludge drying equipment, so that special sludge drying equipment is not required to be added, and the investment is saved; the sludge blending combustion method of the invention fully utilizes the original process of the boiler, fully utilizes the residual heat of the flue gas and the heat value of the sludge, does not need to newly add a heat source and equipment for drying the sludge, and has the advantages of investment saving, strong practicability, low operation cost, no secondary pollution and the like.
Description
Technical Field
The invention relates to a method for harmless treatment and resource utilization of sludge, in particular to a device and a method for mixed burning of sludge by a medium-speed coal mill.
Background
Sludge is an unavoidable by-product of the sewage treatment process. Generally contains pathogenic microorganisms, parasitic ova, harmful heavy metals, a large amount of refractory substances and the like, and must be effectively disposed of so as to minimize the influence on the environment. In addition, the sludge has higher heat value, can be used as fuel after drying treatment, and can be used as building materials because the chemical components of the sludge after combustion treatment are similar to those of the clay, so that the sludge can be reasonably utilized, and the waste can be changed into valuable, thereby becoming a resource.
At present, the coal-fired sludge coupling incineration mainly adopts a circulating fluidized bed boiler, the boiler accounts for a small amount of boiler equipment which is put into operation in China, the newly-built boiler has large investment and high operation cost, and the sludge treatment cost is greatly reduced by the nearby mixed combustion treatment of the sludge.
The utilization of sludge as fuel is a better sludge resource utilization method, and related patents and practices exist. The patent 'sludge treatment method for drying sludge and generating power by using a power plant coal mill', with application number 200910155710.0, sludge is conveyed to the upper part of the coal mill through a metering pump, sludge is introduced into the coal mill through a sludge feeder, the patent describes in detail a conical flow guide powder return device below a separator of the coal mill, and the sludge is mixed with raw coal in the device and then enters a grinding bowl of the coal mill to be ground. In the patent 'method for directly co-firing sludge in environment-friendly pulverized coal furnace' with application number 201810431066.4, a coal mill is adopted to directly dry sludge, but a specific method for feeding sludge into the coal mill is not given. The patent 200820085305.7 entitled sludge treatment system for pulverized coal boiler in power station adopts a spiral sludge drying and forming machine and high-temperature steam to dry sludge, and then the sludge is fed into a coal mill together with coal for grinding. The key technologies of the patents relate to solving the problem of high water content of sludge, and the sludge treatment method for drying the sludge by using a coal mill in a power plant and using the sludge for power generation easily causes coal blockage of a coal dropping pipe due to high water content of the sludge, low temperature of raw coal, uneven mixing and the like, and influences safe and stable operation of powder preparation; the method for directly mixing and burning the sludge in the environment-friendly pulverized coal furnace describes a system for directly drying the sludge by using a coal mill, and does not solve the core problem that the coal mill directly mixes and burns the sludge with high water content and is easy to block coal. The sludge treatment system utilizing the pulverized coal boiler of the power station adopts high-temperature steam to dry sludge, and has certain limitation in application as a mixed combustion treatment method. The sludge is dried and then sent into a pulverizing system through a coal conveying belt, and the main purpose is to prevent wet sludge containing a large amount of external moisture from blocking the pulverizing system, so that the safe and stable operation of the pulverizing system and even a boiler is endangered. The conventional drying methods comprise high-temperature steam drying and high-temperature flue gas drying, and the high-temperature steam or flue gas drying needs special drying equipment, so that the investment is large, and the operation and maintenance cost is high. Therefore, the method for drying and incinerating the sludge by fully utilizing the existing equipment and system without adding new sludge drying equipment and tail gas purification equipment or endangering the safe and stable operation of the existing equipment and system is developed, the sludge treatment cost is reduced, and the resource utilization of the sludge in a large boiler is promoted.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device and a method for sludge mixed combustion of a medium-speed coal mill.
The device for mixing and burning the sludge of the medium speed coal mill is characterized by comprising the following components: the device comprises a sludge pool, a filter screen, a plunger pump, a coal mill sludge electric isolation valve, a medium-speed coal mill, a coal feeder outlet electric valve, a coal dropping pipe inner sleeving pipe, a relevant connecting pipeline and a circular sleeve;
the inlet of the plunger pump is connected with a sludge tank, the inlet of the plunger pump is provided with a filter screen, and the outlet of the plunger pump is directly connected with one end of the circular sleeve;
the other end of the round sleeve is provided with a coal mill sludge electric isolation valve; the coal mill sludge electric isolation valve is connected with a sludge small pipe in a coal dropping pipe inner sleeve pipe and a related connecting pipeline;
the inlet of the coal feeder outlet electric valve is connected with the outlet of the coal feeder, and the outlet of the coal feeder outlet electric valve is connected with a coal dropping pipe in the coal dropping pipe inner sleeve pipe and a coal dropping pipe in a related connecting pipeline;
the sludge small pipe is arranged in a coal dropping pipe at the lower part of an electric valve at the outlet of the coal feeder, and the outlet of the sludge small pipe is flush with the outlet of the coal dropping pipe; preventing wet sludge from blocking the coal dropping pipe;
and the sludge small pipe and the coal dropping pipe are connected to a medium-speed coal mill.
Preferably, the pipe diameter of the sludge small pipe is smaller than 1/10 of the pipe diameter of the coal dropping pipe, the original coal dropping pipe is not required to be replaced, and the normal use of the original coal dropping pipe is not influenced.
The use method of the sludge mixing and burning device of the medium speed coal mill comprises the following steps:
1) filtering sludge with the water content of 70-90% in the sludge pool by a filter screen, and directly pumping the sludge into a medium-speed coal mill by a plunger pump from a small sludge pipe arranged in a coal dropping pipe at the lower part of an electric valve at the outlet of the coal feeder;
2) heating part cold primary air of boiler flue gas becomes hot air, and the hot air and cold air are mixed and supplied at an inlet of a medium-speed coal mill; mixing, crushing and drying the sludge pumped into the medium-speed coal mill and the fire coal supplied to the medium-speed coal mill by the coal feeder;
3) and (3) spraying the sludge powder and the coal powder into the boiler in the step 2) for combustion by the mixed cold air and hot air.
Preferably, the sludge doped into the fire coal in the step 1 is 2-10% of the fire coal.
Preferably, the outlet of a sludge tubule in the coal dropping pipe arranged at the lower part of the electric valve at the outlet of the coal feeder is flush with the outlet of the coal dropping pipe, so that the wet sludge is prevented from blocking the coal dropping pipe; the pipe diameter of the sludge small pipe is smaller than 1/10 of the pipe diameter of the coal dropping pipe, the original coal dropping pipe is not required to be replaced, and the normal use of the original coal dropping pipe is not influenced.
Preferably, when sludge is doped into the fire coal in the step 1, the medium-speed coal mill stably operates above the lowest load of safe operation of the coal mill.
Preferably, the medium speed coal mill in the step 1 is provided with a cold air adjusting baffle and a hot air adjusting baffle, and the hot air adjusting baffle has an adjusting allowance.
Preferably, the sludge passes through a coal mill sludge electric isolating valve before entering the medium-speed coal mill, and the coal mill sludge electric isolating valve is used for isolating the sludge when the system is shut down, so that the sludge is prevented from entering the shut-down coal mill.
The invention has the beneficial effects that: the core problem that the blockage of a pulverizing system is easily caused by directly mixing and burning sludge in the pulverizing system is technically solved by combining the structural characteristics of a coal dropping pipe on a medium-speed coal mill; the problem of odor overflow in the sludge conveying and drying process is solved; the coal mill is also used as sludge drying equipment, so that special sludge drying equipment is not required to be added, and the investment is saved; the sludge is dried by hot air of the coal mill, so that the hot primary air rate is increased, and the waste heat of the flue gas is fully utilized; the sludge blending combustion method of the invention fully utilizes the original process of the boiler, fully utilizes the residual heat of the flue gas and the heat value of the sludge, does not need to newly add a heat source and equipment for drying the sludge, and has the advantages of investment saving, strong practicability, low operation cost, no secondary pollution and the like.
Drawings
FIG. 1 is a process flow diagram of a sludge blending combustion method for a medium speed coal mill;
FIG. 2 is a view showing a structure of a medium speed coal mill (HP type) for drying sludge;
FIG. 3 is a diagram of a method and an apparatus for direct sludge blending combustion of a medium speed coal mill.
The device comprises a sludge pool 1, a filter screen 2, a plunger pump 3, a coal mill sludge electric isolation valve 4, a medium-speed coal mill 5, a coal feeder 6, a coal feeder outlet electric valve 7, a coal dropping pipe inner sleeve pipe and a related connecting pipeline 8.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
A method and a device for sludge mixed burning of a medium speed coal mill comprise the following steps: the device comprises a sludge pool 1, a filter screen 2, a plunger pump 3, a coal mill sludge electric isolation valve 4, a medium-speed coal mill 5, a coal feeder 6, a coal feeder outlet electric valve 7, a coal dropping pipe inner sleeve pipe, a related connecting pipeline 8 and a circular sleeve 9; the sludge tank is used for storing sludge.
An inlet of the plunger pump 3 is connected with a sludge tank 1, an inlet of the plunger pump 3 is provided with a filter screen 2, and an outlet of the plunger pump 3 is directly connected with one end of a circular sleeve 9; the other end of the round sleeve 9 is provided with a coal mill sludge electric isolation valve 4; the coal mill sludge electric isolation valve 4 is connected with a sludge small pipe in a coal dropping pipe inner sleeve pipe and a related connecting pipeline 8; the inlet of the coal feeder outlet electric valve 7 is connected with the outlet of the coal feeder 6, and the outlet of the coal feeder outlet electric valve 7 is connected with a coal dropping pipe in a coal dropping pipe inner sleeve pipe and a coal dropping pipe in a related connecting pipeline 8; the sludge tubule is arranged in the coal dropping pipe at the lower part of the electric valve 7 at the outlet of the coal feeder, and the outlet of the sludge tubule is flush with the outlet of the coal dropping pipe, so that wet sludge is prevented from blocking the coal dropping pipe; the sludge small pipe and the coal dropping pipe are connected to a medium-speed coal mill 5; the pipe diameter of the sludge small pipe is smaller than 1/10 of the pipe diameter of the coal dropping pipe, the original coal dropping pipe is not required to be replaced, and the normal use of the original coal dropping pipe is not influenced.
The filter screen 2 at the inlet of the plunger pump 3 is used for filtering substances which have large volume or large particle size and are difficult to be conveyed by the plunger pump 3. The plunger pump 3 is used for conveying the sludge and increasing the pressure of the sludge. The electronic isolating valve 4 of coal pulverizer mud is used for the isolation of system, closes manual isolating valve when the system overhauls, prevents that plunger pump 3 from starting suddenly and sending into medium speed coal pulverizer 5 with mud. The coal dropping pipe is sleeved with the pipe and is used for directly conveying wet sludge to a 5-bowl grinding machine of a medium-speed coal mill, so that the coal blockage of a coal pulverizing system caused by the wet sludge is prevented. The position of the sludge small pipe connected into the coal dropping pipe is arranged at the lower part of the electric valve 7 at the outlet of the coal feeder, otherwise, the opening and closing of the valve are influenced.
The use method of the sludge mixing and burning device of the medium speed coal mill comprises the following steps:
1) after sludge with the water content of 70-90% in the sludge pool 1 is filtered by a filter screen 2, the sludge is directly pumped into a medium-speed coal mill 5 by a plunger pump 3 from a sludge tubule in a coal dropping pipe arranged at the lower part of an electric valve 7 at the outlet of the coal feeder;
2) heating part cold primary air of boiler flue gas becomes hot air, and the hot air and cold air are mixed and supplied at an inlet of a medium-speed coal mill 5; mixing, crushing and drying the sludge pumped into the medium-speed coal mill 5 and the fire coal supplied to the medium-speed coal mill 5 by the coal feeder 6;
3) and (3) spraying the sludge powder and the coal powder into the boiler in the step 2) for combustion by the mixed cold air and hot air.
And (2) the proportion of sludge doped into the fire coal in the step 1 is 2-10% of that of the fire coal.
When sludge is doped into the fire coal in the step 1, the medium-speed coal mill 5 stably operates above the lowest load of safe operation of the coal mill.
And step 1, the medium-speed coal mill 5 is provided with a cold air adjusting baffle and a hot air adjusting baffle, and the hot air adjusting baffle has an adjusting allowance.
Before entering a medium-speed coal mill 5, the sludge passes through a coal mill sludge electric isolating valve 4, and the coal mill sludge electric isolating valve 4 is used for isolating the sludge when the system is stopped, so that the sludge is prevented from entering the stopped coal mill.
Example (b):
the installed capacity is 1000MW power plant, when the unit load is 1000MW, 5 coal mills operate, 1 stand-by, the biggest continuous output of single coal mill is 80t/h. Therefore, the following assumptions are made:
1) the coal amount of a single coal mill is 60t/h, and the sludge amount is 10%.
2) Assuming that the water content of the sludge is 85%, according to a sludge water content-density relation graph, the corresponding theoretical density d of the sludge is 1.1017 g/ml.
3) An S-shaped pendulum plunger pump produced by a certain company is selected. Maximum conveying capacity of 10m3H is used as the reference value. The pumping amount can be adjusted steplessly according to requirements, and the pumping amount is assumed to be D-6 t/h (slightly less than 6 m)3/h)
4) The conveying speed v is 0.5 m/s.
According to pi r2=D÷v÷3600
R.apprxeq. 32.57mm, i.e. a tube diameter of 65mm, can be calculated.
As shown in FIG. 2, the diameter of the coal dropping pipe on the coal mill is 771 mm. According to the calculation result, a circular pipeline with the pipe diameter of 65mm is arranged in the upper coal dropping pipe, the pipe diameter is less than 1/10 of the pipe diameter of the original coal dropping pipe, the sectional area of the pipeline is less than 1/100 of the coal dropping pipe, and the influence on the original coal dropping pipe can be ignored.
The coal amount of a single coal mill is 60t/h, 5 coal mills are operated, 1 coal mill is reserved, and the boiler can be used for mixing and burning 6 multiplied by 5 multiplied by 24 which is 720 tons of wet sludge every day. Therefore, the invention has stronger practicability and can effectively improve the sludge mixed combustion capacity of the large-scale boiler.
Claims (8)
1. The utility model provides a device that is used for medium speed coal pulverizer to mix burning mud which characterized in that includes: the device comprises a sludge pool (1), a filter screen (2), a plunger pump (3), a coal mill sludge electric isolation valve (4), a medium-speed coal mill (5), a coal feeder (6), a coal feeder outlet electric valve (7), a coal dropping pipe inner sleeved pipe, a related connecting pipeline (8) and a circular sleeve (9);
an inlet of the plunger pump (3) is connected with the sludge tank (1), a filter screen (2) is arranged at the inlet of the plunger pump (3), and an outlet of the plunger pump (3) is directly connected with one end of the circular sleeve (9);
the other end of the round sleeve (9) is provided with a coal mill sludge electric isolation valve (4); the coal mill sludge electric isolation valve (4) is connected with a sludge small pipe in a coal dropping pipe inner sleeve pipe and a related connecting pipeline (8);
an inlet of the coal feeder outlet electric valve (7) is connected with an outlet of the coal feeder (6), and an outlet of the coal feeder outlet electric valve (7) is connected with a coal dropping pipe in a coal dropping pipe inner sleeve pipe and a coal dropping pipe in a related connecting pipeline (8);
the sludge small pipe is arranged in a coal dropping pipe at the lower part of an electric valve (7) at the outlet of the coal feeder, and the outlet of the sludge small pipe is flush with the outlet of the coal dropping pipe;
the sludge small pipe and the coal dropping pipe are connected to a medium-speed coal mill (5).
2. The device for mixed sludge burning of the medium speed coal mill according to claim 1, is characterized in that: the pipe diameter of the sludge small pipe is smaller than 1/10 of the pipe diameter of the coal dropping pipe.
3. The use method of the sludge mixing and burning device of the medium speed coal mill according to claim 1 is characterized by comprising the following steps:
1) after sludge with the water content of 70-90% in the sludge pool (1) is filtered by a filter screen (2), the sludge is directly pumped into a medium-speed coal mill (5) by a plunger pump (3) from a small sludge pipe arranged in a coal dropping pipe at the lower part of an electric valve (7) at the outlet of the coal feeder;
2) partial cold primary air heated by boiler flue gas is changed into hot air, and the hot air and cold air are mixed and supplied at an inlet of a medium-speed coal mill (5); mixing, crushing and drying the sludge pumped into the medium-speed coal mill (5) and the fire coal supplied to the medium-speed coal mill (5) by the coal feeder (6);
3) and (3) spraying the sludge powder and the coal powder into the boiler in the step 2) for combustion by the mixed cold air and hot air.
4. The use method of the sludge mixing and burning device of the medium speed coal mill according to claim 3, wherein the sludge mixing proportion in the fire coal in the step 1 is 2-10% of the fire coal.
5. The use method of the sludge mixing and burning device of the medium speed coal mill according to claim 3 is characterized in that: the outlet of a sludge small pipe in the coal dropping pipe arranged at the lower part of the electric valve (7) at the outlet of the coal feeder is flush with the outlet of the coal dropping pipe, and the pipe diameter of the sludge small pipe is smaller than 1/10 of the pipe diameter of the coal dropping pipe.
6. The use method of the sludge mixing and burning device of the medium speed coal mill according to claim 3 is characterized in that: when sludge is doped into the fire coal in the step 1, the medium-speed coal mill (5) stably operates above the lowest load of safe operation of the coal mill.
7. The use method of the sludge mixing and burning device of the medium speed coal mill according to claim 3 is characterized in that: the medium-speed coal mill (5) in the step 1 is provided with a cold air adjusting baffle and a hot air adjusting baffle, and the hot air adjusting baffle has an adjusting allowance.
8. The use method of the sludge mixing and burning device of the medium speed coal mill according to claim 3 is characterized in that: before entering a medium-speed coal mill (5), the sludge passes through a coal mill sludge electric isolating valve (4), and the coal mill sludge electric isolating valve (4) is used for isolating the sludge when the system is stopped.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112178671A (en) * | 2020-09-30 | 2021-01-05 | 西安热工研究院有限公司 | Method and system suitable for increasing direct blending combustion proportion of wet coal slime for pulverized coal fired boiler |
CN113048491A (en) * | 2021-04-29 | 2021-06-29 | 西安热工研究院有限公司 | Sludge direct-doping coupling coal-fired boiler power generation system and method |
CN113790456A (en) * | 2021-08-31 | 2021-12-14 | 国网浙江省电力有限公司电力科学研究院 | Method and system for calculating maximum sludge blending combustion amount of coal-fired boiler |
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