CN208536019U - The deashing device of novel low low-level (stack-gas) economizer - Google Patents
The deashing device of novel low low-level (stack-gas) economizer Download PDFInfo
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- CN208536019U CN208536019U CN201820957303.6U CN201820957303U CN208536019U CN 208536019 U CN208536019 U CN 208536019U CN 201820957303 U CN201820957303 U CN 201820957303U CN 208536019 U CN208536019 U CN 208536019U
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Abstract
The utility model relates to a kind of deashing devices 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 recycling 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, it is additionally provided with several opening up ash cleaning jet nozzles on each deashing branch pipe, is provided with branch pipe valve 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, 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, improve the uniformity of low low-level (stack-gas) economizer section flue gas duct, it can be effectively reduced the drag losses of boiler controller system, reduce the energy loss of flue gas, enhanced heat transfer effect.
Description
Technical field
The utility model relates to a kind of deashing devices of novel low low-level (stack-gas) economizer, belong to coal-fired power station boiler, industrial pot
The industrial flue gas cleanings such as furnace and waste heat recycling field.
Background technique
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 plant operation exhaust gas temperatures are usually above design value.Therefore, the exhaust gas temperature of station boiler is reduced for energy conservation
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 recycling and reusing 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 waters；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 exchange equipment in pre- device outlet, electric precipitator gas approach, its main function is: 1. reduce 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 is advised
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 lower, and therefore, flue gas in flue flow velocity is lower than design value (9m/s), and flue gas carries flying dust reduced capability, causes
This horizontal segment dust stratification is serious, directly affects the economy and 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: installing ash bucket and defeated in low low-level (stack-gas) economizer horizontal flue bottom
Ash system；I.e. in underrun, since flue gas flow rate is lower, 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, through ancillary equipments such as storehouse pumps by fly ash carry to designated position, to solve low
Dust stratification problem caused by when at warm economizer as boiler controller system underrun.The system capital equipment has: storehouse pump, pneumatics
The compositions such as machine, air compression tank, gasification blower, ash discharging system, ash bucket heater, vapour system；System is relative complex, cost compared with
High and occupied area is larger.
Utility model content
The purpose of the utility model is to provide the deashing device of novel low low-level (stack-gas) economizer, which is simply closed
Reason is adjusted the flow-disturbing of flue gas by way of opening and closing branch pipe valve and main pipe valve, is in flue gas by air quantity and wind pressure
The state of suspension, dust will not fall on flue bottom plate, can effectively reduce low low-level (stack-gas) economizer when boiler controller system underrun
The dust stratification of section flue, improves the uniformity of low low-level (stack-gas) economizer section flue gas duct, can be effectively reduced the resistance damage of boiler controller system
It loses, reduces the energy loss of flue gas, enhanced heat transfer effect.
In order to solve the above technical problems, the utility model adopts the following technical solutions:
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 column (i.e. flue gas circulating direction is arranged) setting, m and n are the natural number greater 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 includes deashing main pipe, ash cleaning jet nozzle, deashing branch pipe, branch pipe valve and main pipe valve, and one end of the deashing branch pipe connects
It is connected to deashing main pipe, main pipe valve is provided in the deashing main pipe, it is opening up to be additionally provided with several on each deashing branch pipe
Ash cleaning jet nozzle, be provided with branch pipe valve on each deashing branch pipe.When underload open deashing branch pipe on branch pipe valve and
Main pipe valve purges flue upwards, so that flue gas is in the state to suspend by air quantity and wind pressure, dust will not fall 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 to pipeline, the setting of discharge outlet can be prevented from generating ponding inside heat exchanger tube leakage rear pass, be influenced
The safety and economy of boiler.
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 and the quantity phase of deashing branch pipe of the branch pipe valve
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, thus boiler load is lower, 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 utility model has the beneficial effect that
1, the deashing device structure in the utility model and simple process, improvement project amount are smaller, and cost is relatively low, by opening
The mode of branch pipe valve and main pipe valve is closed, to adjust the flow-disturbing of flue gas, and then that improves flue gas takes grey ability, can effectively subtract
The dust stratification of low low-level (stack-gas) economizer section flue when few boiler controller system underrun；
2, flue gas can be made to be in the state to suspend by air quantity and wind pressure by using the utility model, dust will not be fallen on
Flue bottom plate, and then reduce dust deposit in flue, the harm of unit chaser caused by avoiding because of dust deposit in flue；When boiler controller system is completely negative
When lotus runs, since the influence of dust stratification changes the flow field of original flue, after the utility model, make former flow field will not
It destroys, greatly reduces the drag losses of boiler controller system, 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 use
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 transfer effect；
4, when the control system in the utility model changes the start and stop of each valve on adjusting deashing branch pipe according to boiler load
Between, it is about primary every two hours purgings when underload；When boiler load is lower, since flue gas flow rate is lower, flue gas is carried
The reduced capability of flying dust, leading to low low-level (stack-gas) economizer entrance flue, there are serious fouling phenomenons, therefore, work as underrun
When, to prevent dust stratification from needing Open valve, so that blowing medium is entered flue through deashing branch pipe and nozzle and purge upwards, by blowing
The perturbation action for sweeping medium enhances the disturbance ability of deposition flying dust, raises again, by the flying dust of deposition under the action of flue gas
It takes away；
5, the utility model and " a kind of soot cleaning system and operation side for thermal power plant's low-level (stack-gas) economizer submitted on the same day
Method " is compared, and ash cleaning jet nozzle is blown not from the bottom up will cause purging because of medium abrasion caused by flue bottom plate；It can pass through simultaneously
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 the project amount of civil engineering, reduces project cost；Provided with a set of control system, when can more adjust the start and stop of each valve in real time
Between and frequency；It is also provided with discharge outlet, can effectively and be in time discharged since the abrasion of flying dust exchange heat pipe causes heat exchanger tube to let out
The ponding of flue when leakage effectively prevents influence of the water accumulation of pipeline to boiler economics and safety.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is also the structural schematic diagram of the utility model；
Fig. 3 is the part connection relationship diagram of the utility model.
The meaning of appended drawing reference: 1- deashing main pipe, 2- heat exchange module, the low low-level (stack-gas) economizer entrance of 3-, 4- ash cleaning jet nozzle, 5-
Deashing branch pipe, 6- support I-steel, 7- branch pipe valve, 8- main pipe valve, 9- discharge outlet, 10- control system.
The utility model is further described with reference to the accompanying drawings and detailed description.
Specific embodiment
The embodiments 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
It is provided with heat exchanger group in warm economizer flue, the heat exchanger group includes that (i.e. flue cross section is from top to bottom for m longitudinal arrangement
Direction setting) setting transversely arranged (the i.e. flue gas circulating direction is arranged) setting of heat exchange module 2, n heat exchange module 2, m and n
It is the natural number greater than 1.One group of deashing device is mounted in 3 sections of flues of low low-level (stack-gas) economizer entrance before deduster, another
Group deashing device 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 valve 7 and main pipe valve 8, one end of several deashing branch pipes 5 are connected with deashing main pipe 1, the deashing main pipe 1
On be provided with main pipe valve 8, several opening up ash cleaning jet nozzles 4, each deashing branch pipe are additionally provided on each deashing branch pipe 5
Branch pipe valve 7 is provided on 5.The branch pipe valve 7 and main pipe valve 8 opened on deashing branch pipe when underload are carried out in flue
Purging upwards 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
Dust stratification.The deashing device further includes control system 10, and the branch pipe valve 7 and the equal signal of main pipe valve 8 are connected to control system
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 of a transversely arranged (i.e. flue gas circulating direction is arranged) setting of heat exchange module 2, the n set, m and n are greater 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
Grey branch pipe 5, branch pipe valve 7 and main pipe valve 8, one end of 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 provided on deashing branch pipe 5.Branch pipe valve 7 and main pipe valve 8 when underload on unlatching deashing branch pipe is right
It being purged upwards in flue, so that flue gas is in the state to suspend by air quantity and wind pressure, dust will not fall on flue bottom plate, into
And reduce dust deposit in flue.The deashing device further includes control system 10, and the branch pipe valve 7 and the equal signal of main pipe valve 8 connect
It is connected to 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 is abrasion to pipeline, the setting of discharge outlet 9 can prevent from generating ponding inside heat exchanger tube leakage rear pass, influence 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, thus that boiler load is lower, 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, primary every two hours purgings when underload.
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 of a transversely arranged (i.e. flue gas circulating direction is arranged) setting of heat exchange module 2, the n set, m and n are greater than 1
Natural number.One group of deashing device is mounted 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
Main pipe valve 8, one end of several deashing branch pipes 5 are connected with deashing main pipe 1, are provided with main pipe 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 provided on each deashing branch pipe 5
Branch pipe valve 7.The branch pipe valve 7 and main pipe valve 8 opened on deashing branch pipe when underload are 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 working principle of embodiment in the utility model: Fig. 1-Fig. 3 indicates the low low-level (stack-gas) economizer of the utility model
Deashing device is used for mounting structure schematic diagram when existing low low-level (stack-gas) economizer system.Low low-level (stack-gas) economizer is by m × n heat exchange mould
Block 2 is formed in building blocks pattern.After high-temperature flue gas as shown in Figure 1 leaves air preheater, enter by 90 ° of elbows of flue horizontal
Flue.Control system 10 is opened the branch pipe valve 7 on deashing branch pipe 5 in underload and is carried out by ash cleaning jet nozzle 4 in flue
Purging upwards, ash cleaning jet nozzle 4 is blown not from the bottom up will cause purging because of medium abrasion caused by flue bottom plate, pass through simultaneously
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 the project amount of civil engineering.Utility model device can effectively reduce low low-level (stack-gas) economizer section when boiler controller system underrun
The dust stratification of flue improves the uniformity of low low-level (stack-gas) economizer section flue gas duct.
Claims (8)
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) of the heat exchange module (2) of m longitudinal arrangement setting, a transversely arranged setting of n, and m and n are
Natural number greater 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), the deashing branch pipe (5) is connected with deashing main pipe
(1), it is provided with main pipe valve (8) on the deashing main pipe (1), it is opening up to be additionally provided with several on each deashing branch pipe (5)
Ash cleaning jet nozzle (4), be 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.
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| CN201820957303.6U CN208536019U (en) | 2018-06-20 | 2018-06-20 | The deashing device of novel low low-level (stack-gas) economizer |
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| CN201820957303.6U CN208536019U (en) | 2018-06-20 | 2018-06-20 | The deashing device of novel low low-level (stack-gas) economizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800174A (en) * | 2018-06-20 | 2018-11-13 | 中国华电科工集团有限公司 | The deashing device and method of novel low low-level (stack-gas) economizer |
| 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 |
-
2018
- 2018-06-20 CN CN201820957303.6U patent/CN208536019U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800174A (en) * | 2018-06-20 | 2018-11-13 | 中国华电科工集团有限公司 | The deashing device and method of novel low low-level (stack-gas) economizer |
| 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 |
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