CN203577543U - Smoke cooling and dedusting device capable of reducing PM2.5 (Particulate Matter) discharge for coal-fired power plant - Google Patents

Smoke cooling and dedusting device capable of reducing PM2.5 (Particulate Matter) discharge for coal-fired power plant Download PDF

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Publication number
CN203577543U
CN203577543U CN201320631262.9U CN201320631262U CN203577543U CN 203577543 U CN203577543 U CN 203577543U CN 201320631262 U CN201320631262 U CN 201320631262U CN 203577543 U CN203577543 U CN 203577543U
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China
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flue gas
coal
scrubbing tower
dedusting device
smoke
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Expired - Lifetime
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CN201320631262.9U
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Chinese (zh)
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史绍平
闫姝
方芳
许世森
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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Abstract

The utility model relates to a smoke cooling and dedusting device capable of reducing PM2.5 (Particulate Matter) discharge for a coal-fired power plant. The device comprises a boiler main body, a tail flue, a dedusting device and a chimney which are sequentially communicated. The device further comprises an air preheater arranged at the bottom of the tail flue. The dedusting device comprises a coarse deduster, an induced draft fan and a washing tower which are sequentially communicated. The method comprises the following steps that smoke from the boiler main body enters into the coarse deduster to be primarily purified so as to remove large solid particles entrained by smoke; primarily purified smoke enters into the washing tower to remove particles with smaller diameter, comprising PM2.5; and finally, clean smoke is discharged to atmosphere through the chimney. The device provided by the utility model can effectively cool and purify smoke with PM2.5 for the coal-fired power plant, and has the characteristics of simple device, mature technology and good dedusting effect.

Description

Can reduce the coal-fired plant flue gas cooling and dedusting device of PM2.5 discharge
Technical field
The utility model relates to dedusting and the cooling technology field of coal-fired plant flue gas, is specifically related to a kind of coal-fired plant flue gas cooling and dedusting device of the PM2.5 of reduction discharge.
Background technology
PM2.5 claims again fine particle, refers to that particle diameter in atmosphere is less than or equal to the particle of 2.5 μ m, and it is very large to health and Atomspheric Environmental.In February, 2012, State Council agrees to that the < < ambient air quality > > of the new revision of issue has increased fine particle monitoring index.
Coal steam-electric plant smoke pollutant is one of main source of PM2.5.At present, heat-engine plant desulfurized denitration process is just pushed forward comprehensively, but flue gas ash removal also relatively lags behind, and still adopts conventional electric precipitation method or bag-type dust method, and one of effective means that therefore present stage PM2.5 administers is to strengthen coal-burning power plant's dedusting.< < key area prevention and control of air pollution " 12 " the planning > > that in October, 2012, Chinese Ministry of Environmental Protection printed and distributed proposes, during " 12 ", need to strengthen industrial smoke-dust and administer, cut down energetically granular material discharged.
The flue gas ash removal method generally adopting in thermal power plant is at present mainly to rely on charging particle to be adsorbed and the Cottrell process of deviating from, but near the particle 1 μ m is in a charged and diffusional charging mixed zone, its charged poor ability, thereby be difficult to remove, therefore up to the present, the industry of PM2.5 is removed and still lacks effective control device.If country will put into effect the coal steam-electric plant smoke dust emission standard for PM2.5 in future, Zhe Lei thermal power plant cannot meet emission regulation, thereby have heavy economic losses.Visible, improve thermal power plant's dust pelletizing system, strengthening thermal power plant dust removing effects has real strategic importance.
Summary of the invention
The problem existing in order to solve above-mentioned prior art, the purpose of this utility model is to provide a kind of coal-fired plant flue gas cooling and dedusting device of the PM2.5 of reduction discharge, can purify the PM2.5 of coal-burning power plant flue gas by effective cooling, has device simple, technology maturation, the feature of good dedusting effect.
For reaching above object, the utility model adopts following technical scheme:
Reduce a coal-fired plant flue gas cooling and dedusting device for PM2.5 discharge, comprise the boiler body 1, back-end ductwork 2, dust arrester 3 and the chimney 4 that are communicated with successively, also comprise the air preheater 5 that is arranged on back-end ductwork 2 bottoms.
Described dust arrester 3 comprises the rough cleaner 6, air-introduced machine 7 and the scrubbing tower 8 that are communicated with successively.
In described scrubbing tower 8, be disposed with water bath 9 from bottom to top, n level hole stream plate 10 and demister 11, wherein n=1~10, in water bath 9, be equipped with outer tube 12, the stream plate below, next stage hole of described n level hole stream plate 10 is provided with the down-flow pipe 16 passing in water bath 9, scrubbing tower 8 is communicated with by down-comer 13 and air-introduced machine 7, the flue gas that enters scrubbing tower 8 enters in water bath 9 along down-comer in scrubbing tower 13, in water bath 9 bottoms, be provided with pipeline, by pipeline, sewage is discharged to depositing reservoir 14, at scrubbing tower 8 tops, be provided with gas outlet 17, by gas outlet 17 and chimney 4, be communicated with.
Described n level hole stream plate 10 is laterally staggered, and each hole stream plate is the tray structure that is covered with aperture.
Also comprise water circulating pump 15, described water circulating pump 15 is connected with the delivery port of depositing reservoir 14 and the supplementing water entrance of scrubbing tower 8 respectively.
Described rough cleaner 6 is electrostatic precipitator, sack cleaner or cyclone dust collectors.
The cooling and dedusting method of the coal-fired plant flue gas cooling and dedusting device of reduced PM2.5 discharge described above, it is characterized in that: in described boiler body 1, the high-temperature flue gas that burning produces transfers heat to after working medium by radiation, heat convection, enters described back-end ductwork 2, air preheater 5 passes to the heat carrying in flue gas the air that is about to enter boiler body, enters rough cleaner 6 carry out preliminary purification from the flue gas of boiler body 1, removes flue gas entrained solid bulky grain, through the flue gas of preliminary purification after air-introduced machine 7, along the interior down-comer 13 of scrubbing tower 8, enter water bath 9 and water fully mixes, the circular passage being upward through again between outer tube 12 and down-comer 13 enters scrubbing tower 8 central space, most of solid particles sediment is separation with flue gas to water bath 9 bottoms, and flue gas upwards flows through n level hole stream plate 10, hole stream plate is the tray structure that is covered with aperture, the clean water flowing into from the supplementing water entrance of scrubbing tower 8 flows into top layer hole stream plate and forms certain water surface elevation, the flue gas rising with certain speed makes shipwreck in the stream plate of hole fall to see through aperture, thereby flue gas fully contacts and further catches the particle carrying in flue gas with the water surface while passing water layer, rinse water is overflowed from Liu Ban edge, hole, flow into and rinse down one deck hole stream plate and carry out repetition flue gas washing process, finally by down-flow pipe 16, flow in water bath 9, the flue gas of discharging from water bath 9 continues upward through n level hole stream plate 10, thereby realize the sedimentation of remaining solid particle in flue gas, last moist flue gas becomes clean flue gas and by chimney 4, enters atmosphere through scrubbing tower gas outlet 17 after demister 11 is removed small water droplet.
For large coal-fired power plant, adopt as required multiple scrubbing tower 8 parallel runnings.
Compared to the prior art, tool has the following advantages the utility model:
1) the utility model belongs to the device that removes exhaust gas dust, by rough cleaner, water bath and multi-stage porous stream panel assembly can realize in a large number and expeditiously dust remove, effectively improve the removal efficiency of PM2.5.
2) the utility model application rough cleaner carries out thick dedusting, can effectively reduce the water consumption of scrubbing tower and take up an area space, and shortened process, reduces investment, improves efficiency of dust collection.
3) the utility model apparatus structure is simple, technology maturation, and floor space is moderate, has good practicality and operability.
4) the utility model device can carry out flue gas pre-cooledly, cooled flue gas is carried out desulfurization and can effectively be reduced the water consumption of desulphurization system, or with desulfurization integrated enforcement simultaneously, promote economy of power plant.
5) the utility model range of application may extend into chemical plant, steel plant and cement plant etc. and relates to the serious association area of particulate emission.
Accompanying drawing explanation
Fig. 1 is the flue gas flow schematic diagram of the utility model embodiment.
Fig. 2 is the dust arrester structural representation of the utility model embodiment.
The specific embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of coal-fired plant flue gas cooling and dedusting device that reduces PM2.5 discharge of the utility model, comprises the boiler body 1, back-end ductwork 2, dust arrester 3 and the chimney 4 that are communicated with successively, also comprises the air preheater 5 that is arranged on back-end ductwork 2 bottoms.Described dust arrester 3 comprises the rough cleaner 6, air-introduced machine 7 and the scrubbing tower 8 that are communicated with successively.Described rough cleaner 6 is for removing the particle that flue gas diameter is larger, to reduce the water consumption of dust arrester described in the utility model and to take up an area space; Described scrubbing tower 8, for removing the particle that flue gas diameter is less, comprises PM2.5.
As shown in Figure 2, in described scrubbing tower 8, be disposed with water bath 9 from bottom to top, n level hole stream plate 10 and demister 11, the present embodiment arranges level Four hole stream plate, for the dust granule of further sedimentation flue gas, in water bath 9, be equipped with outer tube 12, the stream plate below, next stage hole of described n level hole stream plate 10 is provided with the down-flow pipe 16 passing in water bath 9, scrubbing tower 8 is communicated with by down-comer 13 and air-introduced machine 7, the flue gas that enters scrubbing tower 8 enters in water bath 9 along down-comer in scrubbing tower 13, in water bath 9 bottoms, be provided with pipeline, by pipeline, sewage is discharged to depositing reservoir 14, depositing reservoir 14 is used for separating in sewage solid particulate matter and provides supplementing water to scrubbing tower, at scrubbing tower 8 tops, be provided with gas outlet 17, by gas outlet 17 and chimney 4, be communicated with.
As preferred embodiment of the present utility model, described n level hole stream plate 10 is laterally staggered, and each hole stream plate is the tray structure that is covered with aperture.
As preferred embodiment of the present utility model, also comprise water circulating pump 15, described water circulating pump 15 is connected with the delivery port of depositing reservoir 14 and the supplementing water entrance of scrubbing tower 8 respectively.
As preferred embodiment of the present utility model, described rough cleaner 6 is electrostatic precipitator, sack cleaner or cyclone dust collectors.
As depicted in figs. 1 and 2, the utility model can reduce the cooling and dedusting method of the coal-fired plant flue gas cooling and dedusting device of PM2.5 discharge, in described boiler body 1, the high-temperature flue gas that burning produces transfers heat to after working medium by radiation, heat convection, enters described back-end ductwork 2, air preheater 5 passes to the heat carrying in flue gas the air that is about to enter boiler body, enters rough cleaner 6 carry out preliminary purification from the flue gas of boiler body 1, removes flue gas entrained solid bulky grain, through the flue gas of preliminary purification after air-introduced machine 7, along the interior down-comer 13 of scrubbing tower 8, enter water bath 9 and water fully mixes, the circular passage being upward through again between outer tube 12 and down-comer 13 enters scrubbing tower 8 central space, most of solid particles sediment is separation with flue gas to water bath 9 bottoms, water bath 9 is in scrubbing tower 8 bottoms, its bottom has pipeline to be connected with the external world, by pipeline, sewage is discharged to depositing reservoir 14, flue gas upwards flows through n level hole stream plate 10, hole stream plate is the tray structure that is covered with aperture, the clean water flowing into from the supplementing water entrance of scrubbing tower 8 flows into top layer hole stream plate and forms certain water surface elevation, the flue gas rising with certain speed makes shipwreck in the stream plate of hole fall to see through aperture, thereby flue gas fully contacts and further catches the particle carrying in flue gas with the water surface while passing water layer, rinse water is overflowed from Liu Ban edge, hole, flow into and rinse down one deck hole stream plate and carry out repetition flue gas washing process, finally by down-flow pipe 16, flow in water bath 9, the flue gas of discharging from water bath 9 continues upward through n level hole stream plate 10, thereby realize the sedimentation of remaining solid particle in flue gas, last moist flue gas becomes clean flue gas and by chimney 4, enters atmosphere through scrubbing tower gas outlet 17 after demister 11 is removed small water droplet.
As preferred embodiment of the present utility model, for large coal-fired power plant, can adopt as required multiple scrubbing tower 8 parallel runnings.
The utility model dust arrester can effectively remove molecule in coal-fired plant flue gas.Current domestic coal-burning power plant, conventionally take electrostatic precipitation technology as main, adopts sack cleaner on a small quantity.These two kinds of dust collection methods are (> 90%) very efficiently for collecting big dust particle that size exceedes 10 μ m, but for size, are less than the dust of 2 μ m, and its efficiency will sharply decline.For the dust of 0.5~2 μ m, general efficiency can be lower than 50%.So conventional deduster is difficult to remove PM2.5 ultra-fine grain.After the coal-fired plant flue gas dust collection method that use the utility model provides, in testing flue gas, dust has very high removal efficiency, more than 99.9%.Even if be less than the dust of 2 μ m for size, this dust collection method efficiency is also very high, can reach 99%, and efficiency is along with the increase of hole stream flaggy number more and more approaches 100%, and the flue gas of processing is far away higher than the existing environmental protection standard requirement of country: flue dust≤50mg/Nm 3.

Claims (4)

1. one kind can be reduced the coal-fired plant flue gas cooling and dedusting device of PM2.5 discharge, it is characterized in that: comprise the boiler body (1), back-end ductwork (2), dust arrester (3) and the chimney (4) that are communicated with successively, also comprise the air preheater (5) that is arranged on back-end ductwork (2) bottom, described dust arrester (3) comprises the rough cleaner (6), air-introduced machine (7) and the scrubbing tower (8) that are communicated with successively, in described scrubbing tower (8), be disposed with water bath (9) from bottom to top, n level hole stream plate (10) and demister (11), wherein n=1~10, in water bath (9), be equipped with outer tube (12), the stream plate below, next stage hole of described n level hole stream plate (10) is provided with the down-flow pipe (16) passing in water bath (9), scrubbing tower (8) is communicated with by down-comer (13) and air-introduced machine (7), the flue gas that enters scrubbing tower (8) enters in water bath (9) along down-comer in scrubbing tower (13), in water bath (9) bottom, be provided with pipeline, by pipeline, sewage is discharged to depositing reservoir (14), at scrubbing tower (8) top, be provided with gas outlet (17), by gas outlet (17) and chimney (4), be communicated with.
2. the coal-fired plant flue gas cooling and dedusting device that reduces PM2.5 discharge according to claim 1, is characterized in that: described n level hole stream plate (10) is laterally staggered, and each hole stream plate is the tray structure that is covered with aperture.
3. the coal-fired plant flue gas cooling and dedusting device that reduces PM2.5 discharge according to claim 1, it is characterized in that: also comprise water circulating pump (15), described water circulating pump (15) is connected with the delivery port of depositing reservoir (14) and the supplementing water entrance of scrubbing tower (8) respectively.
4. the coal-fired plant flue gas cooling and dedusting device that reduces PM2.5 discharge according to claim 1, is characterized in that: described rough cleaner (6) is electrostatic precipitator, sack cleaner or cyclone dust collectors.
CN201320631262.9U 2013-10-14 2013-10-14 Smoke cooling and dedusting device capable of reducing PM2.5 (Particulate Matter) discharge for coal-fired power plant Expired - Lifetime CN203577543U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103480228A (en) * 2013-10-14 2014-01-01 中国华能集团清洁能源技术研究院有限公司 Smoke dust cooling and collecting device and method capable of reducing PM (particulate matter) 2.5 discharged by coal-fired power plant
CN107754543A (en) * 2017-12-06 2018-03-06 河海大学 Waste gas cleaning system
CN113101776A (en) * 2021-04-29 2021-07-13 江苏永钢集团有限公司 Dust removal device for high-speed wire rod rough and medium rolling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103480228A (en) * 2013-10-14 2014-01-01 中国华能集团清洁能源技术研究院有限公司 Smoke dust cooling and collecting device and method capable of reducing PM (particulate matter) 2.5 discharged by coal-fired power plant
CN107754543A (en) * 2017-12-06 2018-03-06 河海大学 Waste gas cleaning system
CN113101776A (en) * 2021-04-29 2021-07-13 江苏永钢集团有限公司 Dust removal device for high-speed wire rod rough and medium rolling

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Granted publication date: 20140507