CN108800174A - The deashing device and method of novel low low-level (stack-gas) economizer - Google Patents
The deashing device and method of novel low low-level (stack-gas) economizer Download PDFInfo
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- CN108800174A CN108800174A CN201810637675.5A CN201810637675A CN108800174A CN 108800174 A CN108800174 A CN 108800174A CN 201810637675 A CN201810637675 A CN 201810637675A CN 108800174 A CN108800174 A CN 108800174A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 67
- 239000000428 dust Substances 0.000 claims abstract description 49
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003546 flue gas Substances 0.000 claims abstract description 48
- 238000004140 cleaning Methods 0.000 claims abstract description 31
- 238000010926 purge Methods 0.000 claims description 13
- 238000013517 stratification Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 5
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract description 3
- 239000002956 ash Substances 0.000 description 33
- 206010037544 Purging Diseases 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 206010022000 influenza Diseases 0.000 description 3
- 239000012716 precipitator Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 231100000676 disease causative agent Toxicity 0.000 description 2
- PZZOEXPDTYIBPI-UHFFFAOYSA-N 2-[[2-(4-hydroxyphenyl)ethylamino]methyl]-3,4-dihydro-2H-naphthalen-1-one Chemical group C1=CC(O)=CC=C1CCNCC1C(=O)C2=CC=CC=C2CC1 PZZOEXPDTYIBPI-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- -1 machine Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes or flue ways
- F22D1/04—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
- F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Incineration Of Waste (AREA)
Abstract
The present invention relates to a kind of deashing devices and method of novel low low-level (stack-gas) economizer, belong to the industrial flue gas cleanings such as coal-fired power station boiler, Industrial Boiler and waste heat recovery field.Deashing device includes deashing main pipe, ash cleaning jet nozzle, deashing branch pipe, branch pipe valve and main pipe valve, one end of several deashing branch pipes is connected with deashing main pipe, main pipe valve is provided in deashing main pipe, several opening up ash cleaning jet nozzles are additionally provided on each deashing branch pipe, branch pipe valve is both provided on each deashing branch pipe.The system adjusts the flow-disturbing of flue gas by way of opening and closing branch pipe valve and main pipe valve, so that flue gas is in the state to suspend by air quantity and wind pressure, dust will not fall on flue bottom plate, improve the uniformity of low low-level (stack-gas) economizer section flue gas duct.The ash removal method of novel low low-level (stack-gas) economizer is additionally provided, the drag losses of boiler controller system can be effectively reduced, reduces the energy loss of flue gas, enhanced heat exchange effect.
Description
Technical field
The present invention relates to a kind of deashing devices and method of novel low low-level (stack-gas) economizer, belong to coal-fired power station boiler, industry
The industrial flue gas cleanings such as boiler and waste heat recovery field.
Background technology
Heat loss due to exhaust gas proportion is larger in operation for coal-fired plant boiler, accounts for 50% or more total heat loss of boiler,
Some thermal power plants operation exhaust gas temperature is usually above design value.Therefore, the exhaust gas temperature of station boiler is reduced for energy saving
Emission reduction has important practical significance, and low low-level (stack-gas) economizer is widely used in this context.At present frequently with low
Warm economizer carries out waste heat recovery recycling to the high-temperature flue gas of discharge, and the heat of low low-level (stack-gas) economizer recycling is currently used primarily in
The following aspects：1. heating steam turbine side condensed water；2. heating desulfurization outlet tail flue gas；3. heating boiler Secondary Air.It is low
Warm economizer be mostly installed at after boiler of power plant air preheater and before electric precipitator between on flue, as coal-fired plant boiler sky
Heat transmission equipment in pre- device outlet, electric precipitator gas approach, its main function are:1. reducing exhaust gas temperature, recycling
Flue gas heat improves boiler efficiency；2. reducing dust specific resistance and practical exhaust gas volumn, efficiency of dust collection is improved；3. reducing desulfurization to mend
Water；4. reducing desulfuration absorbing tower exports dust concentration, power plant's minimum discharge is realized.Current low low-level (stack-gas) economizer is arranged in sky mostly
On horizontal flue between pre- device outlet and electric precipitator entrance, according to《Thermal power plant cigarette wind pulverized coal channel designing technique rule
Journey》And engineering experience, to prevent horizontal segment dust deposit in flue here, while to prevent low low-level (stack-gas) economizer heat exchanger tube serious wear；Cause
This, when designing flue, the flue gas flow rate of this section of flue is designed by 9m/s or so.China's major part boiler of power plant machine at present
Group operating load is relatively low, and therefore, flue gas in flue flow velocity is less than design value (9m/s), and flue gas carries flying dust reduced capability, causes
This horizontal segment dust stratification is serious, directly affects economy and the safety of boiler.Up to the present, for low low-level (stack-gas) economizer system
Underload dust stratification serious problems never have relatively reasonable solution.
In view of the above-mentioned problems, previous way is mainly：Ash bucket and defeated is installed in low low-level (stack-gas) economizer horizontal flue bottom
Ash system；I.e. in underrun, since flue gas flow rate is relatively low, flue gas carries flying dust ability to be weakened significantly；When flue gas passes through
When low low-level (stack-gas) economizer, flying dust falls into ash bucket, low to solve through ancillary equipments such as storehouse pumps by fly ash carry to designated position
Dust stratification problem caused by when at warm economizer due to boiler controller system underrun.The system capital equipment has：Storehouse pump, pneumatics
The compositions such as machine, air compression tank, gasification wind turbine, ash discharging system, ash bucket heater, vapour system；System is relative complex, cost compared with
High and floor space is larger.
Invention content
The object of the present invention is to provide the deashing device of novel low low-level (stack-gas) economizer, which leads to
It crosses and opens and closes the mode of branch pipe valve and main pipe valve to adjust the flow-disturbing of flue gas, so that flue gas is in suspension by air quantity and wind pressure
State, dust will not fall on flue bottom plate, can effectively reduce low low-level (stack-gas) economizer section flue when boiler controller system underrun
Dust stratification, improve the uniformity of low low-level (stack-gas) economizer section flue gas duct；The ash removal method of novel low low-level (stack-gas) economizer is additionally provided,
The drag losses that boiler controller system can effectively be reduced reduce the energy loss of flue gas, enhanced heat exchange effect.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
The deashing device of novel low low-level (stack-gas) economizer, wherein heat exchanger group is provided in low low-level (stack-gas) economizer flue, it is described
Heat exchanger group includes the heat exchange module of m longitudinal arrangement (i.e. the direction setting of flue cross section from top to bottom) setting, n lateral row
The heat exchange module of row (i.e. flue gas circulating direction is arranged) setting, m and n are the natural number more than 1.One group of deashing device is mounted on
In low low-level (stack-gas) economizer entrance flue before deduster, another group of deashing device is mounted between heat exchanger group, the deashing
Device include deashing main pipe, ash cleaning jet nozzle, deashing branch pipe, branch pipe valve and main pipe valve, several deashing branch pipes
One end is connected with deashing main pipe, and main pipe valve is provided in the deashing main pipe, and being additionally provided with several on each deashing branch pipe opens
Mouth ash cleaning jet nozzle upward is both provided with branch pipe valve on each deashing branch pipe.The branch pipe on deashing branch pipe is opened when underload
Valve and main pipe valve purge flue upwards, so that flue gas is in the state to suspend by air quantity and wind pressure, dust will not be fallen on
Flue bottom plate, and then reduce dust deposit in flue.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned, the deashing device further includes control system, the branch pipe
Valve and the equal signal of main pipe valve are connected to control system.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned further includes discharge outlet, and the discharge outlet is set to the bottom of flue
Portion.Since flying dust has abrasion, the setting of discharge outlet that can prevent from generating ponding inside heat exchanger tube leakage rear pass, influence in pipeline
The safety of boiler and economy.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned, the ash cleaning jet nozzle are sprayed using non-return nozzle or blast cap
Mouth.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned, ash cleaning jet nozzle are from the horizontal by certain angle a, a
45 °~135 °.The distance between ash cleaning jet nozzle is 200mm~500mm on each deashing branch pipe.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned, the deashing branch pipe is through supporting I-steel to be supported in flue
Portion, the support I-steel are welded in flue inner wall.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned, the quantity of the branch pipe valve and the quantity phase of deashing branch pipe
Deng the quantity of the main pipe valve is equal with deashing main pipe.
The deashing device of novel low low-level (stack-gas) economizer above-mentioned, the blowing medium in the deashing main pipe are that power plant is primary
Wind, power plant's Secondary Air or compressed air.
The ash removal method of novel low low-level (stack-gas) economizer, using the deashing device of novel low low-level (stack-gas) economizer above-mentioned, including
Following methods：Control system adjusts the unlatching quantity and open frequency of branch pipe valve according to the load signal of boiler, also adjusts female
The open frequency of tube valve, to boiler load is relatively low, flue gas take grey ability it is weaker when, to prevent dust stratification from needing to open branch pipe
Valve and main pipe valve make the blowing medium in deashing main pipe enter flue through deashing branch pipe and ash cleaning jet nozzle and purge upwards,
Flue gas is set to be in the state to suspend by air quantity and wind pressure, dust will not fall on flue bottom plate, reduce the dust load of flue,
The flying dust of deposition is taken away under the action of flue gas.
The ash removal method of novel low low-level (stack-gas) economizer above-mentioned, control system changes according to boiler load adjusts deashing branch pipe
It is the start-stop time of upper branch pipe valve, primary every two hours purgings when underload.
Compared with prior art, the invention has the beneficial effects that：
1, the present invention in deashing device structure and it is simple for process, improvement project amount is smaller, cost is relatively low, pass through open and close branch
The mode of tube valve and main pipe valve, to adjust the flow-disturbing of flue gas, and then that improves flue gas takes grey ability, can effectively reduce pot
The dust stratification of low low-level (stack-gas) economizer section flue when stove performing low-load running of machine set；
2, flue gas can be made to be in the state to suspend by air quantity and wind pressure by using the present invention, dust will not fall on flue
Bottom plate, and then dust deposit in flue is reduced, avoid the harm of the unit chaser caused by dust deposit in flue；When boiler controller system is transported at full capacity
When row, since the influence of dust stratification changes the flow field of original flue, after the present invention, so that former flow field is not destroyed, make
The drag losses of boiler controller system greatly reduce, and improve the economy of boiler operatiopn；
3, it is provided with control system, signal connects the branch pipe valve therewith with main pipe valve, and control system can utilize
The Signal Regulation of boiler load variation feedback purges start-stop time and the frequency of various valves, and then reduces the dust stratification of flue, makes
The heat exchange area of low low-level (stack-gas) economizer increases, and reduces the energy loss of flue gas, enhanced heat exchange effect；
4, the ash removal method in the present invention, control system therein changes according to boiler load adjusts each valve on deashing branch pipe
It is the start-stop time of door, about primary every two hours purgings when underload；When boiler load is relatively low, due to flue gas flow rate compared with
Low, flue gas carries the reduced capability of flying dust, and leading to low low-level (stack-gas) economizer entrance flue, there are serious fouling phenomenons, therefore, when
When underrun, to prevent dust stratification from needing Open valve, blowing medium is set through deashing branch pipe and nozzle to enter flue upward
Purging is enhanced the disturbance ability of deposition flying dust, is raised again, under the action of flue gas by the perturbation action of blowing medium
The flying dust of deposition is taken away；
5, the present invention and " a kind of soot cleaning system and operation method for the thermal power plant's low-level (stack-gas) economizer " phase submitted on the same day
Than ash cleaning jet nozzle blows the purging that will not make causative agent and worn caused by flue bottom plate from the bottom up；It simultaneously can be by suitable
Air quantity and wind pressure so that flue gas is in the state to suspend, dust will not fall on flue bottom plate, reduce the dust load of flue, reduce
The quantities of civil engineering reduces project cost；Provided with a set of control system, can more adjust in real time each valve start-stop time and
Frequency；Be also provided with discharge outlet, can effectively and in time be discharged due to flying dust exchange heat pipe abrasion cause heat exchanger tube to leak when
The ponding of flue effectively prevents influence of the water accumulation of pipeline to boiler economics and safety.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is also the structural schematic diagram of the present invention；
Fig. 3 is the part connection relationship diagram of the present invention.
The meaning of reference numeral：1- deashing main pipes, 2- heat exchange modules, the low low-level (stack-gas) economizer entrances of 3-, 4- ash cleaning jet nozzles, 5-
Deashing branch pipe, 6- support I-steel, 7- branch pipe valves, 8- main pipe valves, 9- discharge outlet, 10- control systems.
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Specific implementation mode
The embodiment of the present invention 1：As shown in Figure 1-Figure 3, the deashing device of novel low low-level (stack-gas) economizer, wherein low temperature saves
Heat exchanger group is provided in coal device flue, the heat exchanger group includes m longitudinal arrangement (the i.e. direction of flue cross section from top to bottom
It is arranged) heat exchange module 2 that heat exchange module 2, the n transversely arranged (i.e. flue gas circulating direction is arranged) of setting are arranged, m and n are
Natural number more than 1.For one group of deashing device in 3 sections of flues of low low-level (stack-gas) economizer entrance before deduster, another group clear
Apparatus for ash is mounted between heat exchanger group, and the deashing device includes deashing main pipe 1, ash cleaning jet nozzle 4, deashing branch pipe 5, branch pipe
One end of valve 7 and main pipe valve 8, several deashing branch pipes 5 is connected with deashing main pipe 1, is arranged in the deashing main pipe 1
There is main pipe valve 8, be additionally provided with several opening up ash cleaning jet nozzles 4 on each deashing branch pipe 5, on each deashing branch pipe 5
It is provided with branch pipe valve 7.The branch pipe valve 7 and main pipe valve 8 opened when underload on deashing branch pipe are upward to being carried out in flue
Purging makes flue gas be in the state to suspend by air quantity and wind pressure, and dust will not fall on flue bottom plate, and then reduce flue product
Ash.The deashing device further includes control system 10, and the branch pipe valve 7 and 8 equal signal of main pipe valve are connected to control system
10。
Embodiment 2：As shown in Figure 1-Figure 3, the deashing device of novel low low-level (stack-gas) economizer, wherein low low-level (stack-gas) economizer flue
It is inside provided with heat exchanger group, the heat exchanger group includes that m longitudinal arrangement (i.e. the direction setting of flue cross section from top to bottom) is set
The heat exchange module 2 for a transversely arranged (the i.e. flue gas circulating direction is arranged) setting of heat exchange module 2, n set, m and n are more than 1
Natural number, specifically, m is 4, n 2.One group of deashing device is mounted on 3 sections of flues of low low-level (stack-gas) economizer entrance before deduster
Interior, another group of deashing device is mounted between heat exchanger group, and the deashing device includes deashing main pipe 1, ash cleaning jet nozzle 4, clear
One end of grey branch pipe 5, branch pipe valve 7 and main pipe valve 8, several deashing branch pipes 5 is connected with deashing main pipe 1, described clear
It is provided with main pipe valve 8 in grey main pipe 1, several opening up ash cleaning jet nozzles 4 are additionally provided on each deashing branch pipe 5, each
Branch pipe valve 7 is both provided on deashing branch pipe 5.Branch pipe valve 7 and main pipe valve 8 when underload on unlatching deashing branch pipe is to cigarette
It is purged upwards in road, so that flue gas is in the state to suspend by air quantity and wind pressure, dust will not fall on flue bottom plate, in turn
Reduce dust deposit in flue.The deashing device further includes control system 10, and the branch pipe valve 7 is connected with 8 equal signal of main pipe valve
In control system 10.
Further, the deashing device further includes discharge outlet 9, and the discharge outlet 9 is set to the bottom of flue.Due to flying dust
There are abrasion, the setting of discharge outlet 9 that can prevent from generating ponding inside heat exchanger tube leakage rear pass in pipeline, influences the safety of boiler
Property and economy.The ash cleaning jet nozzle 4 uses non-return nozzle or blast cap nozzle.Ash cleaning jet nozzle 4 is from the horizontal by certain
Angle a, a are 45 °~135 °.The distance between ash cleaning jet nozzle 4 is 200mm~500mm on each deashing branch pipe 5.The deashing
Through supporting I-steel 6 to be supported in inside flue, the support I-steel 6 is welded in flue inner wall branch pipe 5.The branch pipe valve
7 quantity is equal with the quantity of deashing branch pipe 5, and the quantity of the main pipe valve 8 is equal with deashing main pipe 1.The deashing main pipe 1
In blowing medium be power plant's First air, power plant's Secondary Air or compressed air.
Embodiment 3：As Figure 1-Figure 2, the ash removal method of novel low low-level (stack-gas) economizer, using novel low temperature above-mentioned
The deashing device of economizer, including following methods：Control system 10 adjusts the unlatching of branch pipe valve 7 according to the load signal of boiler
Quantity and open frequency also adjust the open frequency of main pipe valve 8, to that boiler load is relatively low, flue gas takes grey ability is weaker
When, to prevent dust stratification from needing to open branch pipe valve 7 and main pipe valve 8, make the blowing medium in deashing main pipe 1 through deashing branch pipe 5
Flue is entered with ash cleaning jet nozzle 4 to purge upwards, so that flue gas is in the state to suspend by air quantity and wind pressure, dust will not be fallen on
Flue bottom plate reduces the dust load of flue, takes away the flying dust of deposition under the action of flue gas.Control system 10 is according to boiler
Load variations adjust the start-stop time of branch pipe valve 7 on deashing branch pipe 5, and when underload is primary every two hours purgings.
Embodiment 4：As Figure 1-Figure 2, the deashing device of novel low low-level (stack-gas) economizer, wherein low low-level (stack-gas) economizer flue
It is inside provided with heat exchanger group, the heat exchanger group includes that m longitudinal arrangement (i.e. the direction setting of flue cross section from top to bottom) is set
The heat exchange module 2 for a transversely arranged (the i.e. flue gas circulating direction is arranged) setting of heat exchange module 2, n set, m and n are more than 1
Natural number.One group of deashing device is in 3 sections of flues of low low-level (stack-gas) economizer entrance before deduster, another group of deashing device peace
Between heat exchanger group, the deashing device includes deashing main pipe 1, ash cleaning jet nozzle 4, deashing branch pipe 5,7 and of branch pipe valve
One end of main pipe valve 8, several deashing branch pipes 5 is connected with deashing main pipe 1, and main pipe is provided in the deashing main pipe 1
Valve 8 is additionally provided with several opening up ash cleaning jet nozzles 4 on each deashing branch pipe 5, is both provided on each deashing branch pipe 5
Branch pipe valve 7.The branch pipe valve 7 and main pipe valve 8 on deashing branch pipe are opened when underload to being purged upwards in flue, are led to
Crossing air quantity and wind pressure makes flue gas be in the state to suspend, and dust will not fall on flue bottom plate, and then reduce dust deposit in flue.It is described clear
Grey nozzle 4 uses non-return nozzle or blast cap nozzle.
A kind of operation principle of embodiment in the present invention：Fig. 1-Fig. 3 indicates the deashing device of the low low-level (stack-gas) economizer of the present invention
Mounting structure schematic diagram when for existing low low-level (stack-gas) economizer system.Low low-level (stack-gas) economizer is by m × n heat exchange module 2 in product
Die model formula forms.After high-temperature flue gas as shown in Figure 1 leaves air preheater, enter horizontal flue by 90 ° of elbows of flue.Control
System 10 processed opens the branch pipe valve 7 on deashing branch pipe 5 in underload by ash cleaning jet nozzle 4 to being blown upwards in flue
It sweeps, ash cleaning jet nozzle 4 blows the purging that will not make causative agent and worn caused by flue bottom plate from the bottom up, while by suitable
Air quantity and wind pressure make flue gas be in the state to suspend, and dust will not fall on flue bottom plate, reduce the dust load of flue, reduce soil
The quantities built.Apparatus of the present invention can effectively reduce the product of low low-level (stack-gas) economizer section flue when boiler controller system underrun
Ash improves the uniformity of low low-level (stack-gas) economizer section flue gas duct.The present invention also provides a kind of ash removal method, this method can be effective
The drag losses for reducing boiler controller system, reduce the energy loss of flue gas, enhanced heat exchange effect.
Claims (10)
1. the deashing device of novel low low-level (stack-gas) economizer, wherein heat exchanger group is provided in low low-level (stack-gas) economizer flue, it is described to change
Hot device group includes the heat exchange module (2) for a transversely arranged setting of heat exchange module (2), n that m longitudinal arrangement is arranged, and m and n are
Natural number more than 1, which is characterized in that one group of deashing device is mounted on low low-level (stack-gas) economizer entrance (3) the section cigarette before deduster
In road, another group of deashing device is mounted between heat exchanger group, and the deashing device includes deashing main pipe (1), ash cleaning jet nozzle
(4), one end of deashing branch pipe (5), branch pipe valve (7) and main pipe valve (8), several deashing branch pipes (5) is connected with clearly
Grey main pipe (1) is provided with main pipe valve (8) on the deashing main pipe (1), and being additionally provided with several on each deashing branch pipe (5) opens
Mouth ash cleaning jet nozzle (4) upward is both provided with branch pipe valve (7) on each deashing branch pipe (5).
2. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that the deashing device is also
Including control system (10), the branch pipe valve (7) and main pipe valve (8) signal are connected to control system (10).
3. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that further include discharge outlet
(9), the discharge outlet (9) is set to the bottom of flue.
4. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that the ash cleaning jet nozzle
(4) non-return nozzle or blast cap nozzle are used.
5. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that ash cleaning jet nozzle (4) with
Horizontal direction has a certain degree a, and a is 45 °~135 °；The distance between ash cleaning jet nozzle (4) is on each deashing branch pipe (5)
200mm~500mm.
6. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that the deashing branch pipe
(5) through supporting I-steel (6) to be supported in inside flue, the support I-steel (6) is welded in flue inner wall.
7. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that the branch pipe valve
(7) quantity is equal with the quantity of deashing branch pipe (5), and the quantity of the main pipe valve (8) is equal with deashing main pipe (1).
8. the deashing device of novel low low-level (stack-gas) economizer according to claim 1, which is characterized in that the deashing main pipe
(1) blowing medium in is power plant's First air, power plant's Secondary Air or compressed air.
9. the ash removal method of novel low low-level (stack-gas) economizer, using any novel low low-level (stack-gas) economizers of claim 1-8
Deashing device, which is characterized in that including following methods：Control system (10) adjusts branch pipe valve according to the load signal of boiler
(7) unlatching quantity and open frequency also adjust the open frequency of main pipe valve (8), to boiler load is relatively low, flue gas is taken
When grey ability is weaker, to prevent dust stratification from needing to open branch pipe valve (7) and main pipe valve (8), make the purging in deashing main pipe (1)
Medium is entered in flue and is purged upwards through deashing branch pipe (5) and ash cleaning jet nozzle (4), so that flue gas is in outstanding by air quantity and wind pressure
Floating state, dust will not fall on flue bottom plate, reduce the dust load of flue, by the flying dust band of deposition under the action of flue gas
It walks.
10. the ash removal method of novel low low-level (stack-gas) economizer according to claim 8, which is characterized in that control system (10)
Changed according to boiler load the start-stop time for adjusting branch pipe valve (7) on deashing branch pipe (5), when underload every two hours to
Upper purging is primary.
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| CN109442377A (en) * | 2018-12-13 | 2019-03-08 | 中国华能集团清洁能源技术研究院有限公司 | A kind of low low-level (stack-gas) economizer system and application method of efficient anti-gray |
| CN110173706A (en) * | 2019-06-17 | 2019-08-27 | 中国华电科工集团有限公司 | Deashing device and operation method for coal steam-electric plant smoke afterheat utilizing system |
| CN110743301A (en) * | 2019-10-18 | 2020-02-04 | 华电电力科学研究院有限公司 | Coal-fired power plant electric bag dust removal system and method |
| CN112856787A (en) * | 2021-03-03 | 2021-05-28 | 北京瀚江新材料科技有限公司 | Environment-friendly air conditioner tuber pipe accuse wind valve part |
| CN113086652A (en) * | 2021-04-21 | 2021-07-09 | 西安热工研究院有限公司 | Prevent stifled grey system suitable for coal fired power plant malleation dense phase pneumatic conveying ash system storehouse pump |
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Application publication date: 20181113 |