CN112221332A - A device and method for preventing clogging and corrosion of low and low temperature economizers - Google Patents
A device and method for preventing clogging and corrosion of low and low temperature economizers Download PDFInfo
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- CN112221332A CN112221332A CN202010820209.8A CN202010820209A CN112221332A CN 112221332 A CN112221332 A CN 112221332A CN 202010820209 A CN202010820209 A CN 202010820209A CN 112221332 A CN112221332 A CN 112221332A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 239000003546 flue gas Substances 0.000 claims abstract description 48
- 230000002745 absorbent Effects 0.000 claims abstract description 39
- 239000002250 absorbent Substances 0.000 claims abstract description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 36
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 14
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 10
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
本发明涉及一种预防低低温省煤器堵塞腐蚀问题的装置及方法，料仓内盛放有能与烟气中的SO3发生反应的碱性吸收剂；喷头组件安装在低低温省煤器烟气入口烟道内部；料仓、溶解罐、输送泵和喷头组件通过管路顺次连接，料仓中的碱性吸收剂进入到溶解罐中进行溶解后在输送泵的作用下经喷头组件喷洒在低低温省煤器烟气入口烟道内部。本装置利用酸碱中和原理，在低低温省煤器前端烟道内部设置喷碱性吸收剂装置，在烟气进入低低温省煤器前将烟气中的SO3中和去除，保证低低温省煤器不被硫酸氢铵堵塞腐蚀，降低低低温省煤器运行风险的同时，保证低低温电除尘器的环保效益和节能效益。
The invention relates to a device and method for preventing clogging and corrosion of a low-low temperature economizer. A silo is filled with an alkaline absorbent capable of reacting with SO3 in flue gas; a nozzle assembly is installed on the low-low temperature economizer. The inside of the flue gas inlet flue; the silo, the dissolving tank, the delivery pump and the nozzle assembly are connected in sequence through the pipeline, and the alkaline absorbent in the silo enters the dissolving tank for dissolution, and then passes through the nozzle assembly under the action of the delivery pump. It is sprayed inside the flue gas inlet flue of the low and low temperature economizer. The device utilizes the principle of acid-base neutralization, and an alkaline absorbent device is installed inside the flue at the front end of the low - low temperature economizer to neutralize and remove SO3 in the flue gas before the flue gas enters the low-low temperature economizer to ensure low The low-temperature economizer is not blocked and corroded by ammonium hydrogen sulfate, which reduces the operation risk of the low-low temperature economizer and ensures the environmental protection and energy-saving benefits of the low-low temperature electrostatic precipitator.
Description
Technical Field
The invention relates to the field of industrial waste gas treatment environment protection and energy, in particular to a device and a method for preventing a low-temperature economizer from being blocked and corroded.
Background
At present, the ultra-low emission of coal-fired power plants in most areas of China is realized, and the technology of 'low-temperature economizer + electrostatic dust collector' is adopted for controlling the smoke dust of part of the coal-fired power plants: the low-temperature economizer is arranged at the inlet of the electrostatic dust collector, the temperature of the flue gas is reduced after the flue gas passes through the low-temperature economizer, and the flow of the flue gas is reduced, so that the flow rate of the flue gas in the dust collector body is reduced, the retention time of the flue gas in the dust collector body is increased, and the aim of improving the dust removal efficiency is fulfilled. Generally, the flue gas temperature of the coal-fired power plant is reduced to 90 ℃ after passing through the low-temperature economizer. The coal-fired power plant can bring two benefits by additionally arranging the low-temperature economizer: 1. environmental protection benefit: improve the dust removal efficiency of the electrostatic dust collector and remove SO in the flue gas3(the temperature of the flue gas at the outlet of the low-temperature and low-temperature economizer is 10 ℃ to 15 ℃ lower than the dew point of acid, and SO in the flue gas3Will condense and separate out at the temperature, will be removed by the electrostatic precipitator after being wrapped up by the fly ash); 2. energy-saving benefits: the cold source of the low-temperature economizer is usually taken from low-pressure condensate water of the steam turbine, and the waste heat released by cooling the flue gas can be used for heating the condensate water of the steam turbine, so that the coal consumption of the boiler is reduced.
However, the running condition of the low-temperature coal economizer of the coal-fired power plant is researched, the problem of blockage and corrosion of the low-temperature coal economizer of most coal-fired power plants is solved, and therefore the environmental protection benefit and the energy saving benefit of the low-temperature coal economizer are greatly reduced. Even the low-temperature coal economizer of a specific coal-fired power plant has serious blockage and overhigh pressure head, so that the output of a fan is insufficient, and the normal operation of a coal-fired unit is influenced. Through field research and reference of documents, the blockage of the low-temperature economizer is caused by two conditions: the first condition is that fly ash is settled and blocks the low-temperature economizer, the condition can be solved by blowing the on-line steam soot blower and the sound wave soot blower, and even if blowing dead angles exist, the problem of manual ash removal by compressed air or a high-pressure water gun can be solved in the process of shutdown maintenance; the other condition is that ammonium bisulfate deposits and adheres to block the low-temperature economizer, and the phenomenon is thatDue to ammonia overspray of an upstream denitration device of a coal-fired power plant and SO condensed by a low-temperature economizer3The blockage of the online ash removal mode cannot be solved due to the fact that the generated ammonium bisulfate is adhered to the heat exchange fins of the low-temperature economizer in a combined mode, and the manual ash removal effect is very limited in the shutdown process, because the ammonium bisulfate is accompanied with the occurrence of corrosion when the low-temperature economizer is blocked, the blockage corrosion is irreversible.
At present, a coal-fired power plant can better treat and solve the first blockage situation of a low-temperature economizer (online ash removal and manual ash removal), but a better method for solving the second blockage corrosion problem still does not exist at present. At present, in order to solve the second problem of low-temperature coal economizer blockage corrosion (due to ammonium bisulfate deposition blockage of the low-temperature coal economizer), the coal-fired power plant usually adopts the following three measures: controlling the ammonia escape rate of a flue gas upstream denitration device: however, the ammonia escape rate can only be reduced and cannot be eliminated, so the measure can only delay the blockage time of the low-temperature economizer but cannot radically cure the blockage; secondly, strengthening soot blowing of the low-temperature economizer: however, this method is only effective for removing dust blocked on the low-temperature economizer, for example, patent application with publication number CN210568510U discloses an anti-dust deposition device for the low-temperature economizer of a power station boiler, which solves the problem of gradual accumulation of dust at the bottom of a flue of a heat exchange surface, and ensures safe and reliable operation of the low-temperature economizer, but ammonium bisulfate has strong viscosity, and ammonium bisulfate adhered to the low-temperature economizer is difficult to blow off; controlling the temperature of the flue gas at the outlet of the low-temperature economizer to be SO3Above the acid dew point, make SO3Non-coagulation (see patent with grant publication No. CN 210398880U): the control mode can solve the problem that the deposition of ammonium bisulfate blocks the low-temperature economizer, but the low-temperature economizer cannot achieve the maximum design output capacity due to insufficient cooling range of the flue gas temperature, and the energy-saving benefit and the environmental protection benefit are greatly reduced.
In conclusion, the problem of blockage and corrosion of the low-temperature economizer of the coal-fired power plant caused by ammonium bisulfate deposition is not yet a mature and reliable solution at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device and a method for preventing the blockage corrosion problem of a low-temperature and low-temperature economizer.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a device of low temperature economizer jam corrosion problem which characterized in that: comprises a storage bin, a dissolving tank, a delivery pump and a spray head assembly; the storage bin is filled with SO capable of being mixed with the flue gas3A reactive alkaline absorbent; the spray head assembly is arranged inside a flue at a flue gas inlet of the low-temperature economizer; the feed bin, the dissolving tank, the delivery pump and the spray head assembly are sequentially connected through a pipeline, and an alkaline absorbent in the feed bin enters the dissolving tank to be dissolved and then is sprayed into the flue gas inlet of the low-temperature economizer through the spray head assembly under the action of the delivery pump.
Preferably, install the spiral weighing batcher between feed bin and dissolving tank, the discharge gate of feed bin passes through the tube coupling with the entrance point of spiral weighing batcher, and the exit end of spiral weighing batcher passes through the entrance point of tube coupling with dissolving tank.
Preferably, a top-feed stirrer for sufficiently dissolving the alkaline absorbent is installed in the dissolving tank.
Preferably, the upper part of the dissolving tank is provided with a process water inlet, the bottom of the dissolving tank is provided with a sewage outlet, and the sewage outlet is provided with a first valve.
Preferably, a second valve is arranged on a connecting pipeline between the dissolving tank and the delivery pump, and a flow meter, a flow pressure meter and a third valve are sequentially arranged on the connecting pipeline between the delivery pump and the spray head assembly according to the liquid delivery direction.
Preferably, the device also comprises a standby delivery pump, wherein the standby delivery pump and the delivery pump are arranged side by side, one end of the standby delivery pump is connected with the second valve, and the other end of the standby delivery pump is connected with the flowmeter.
Preferably, the standby delivery pump and the delivery pump both adopt variable-frequency delivery pumps.
Preferably, the shower nozzle subassembly includes that one is the mounting bracket of grid and installs a plurality of nozzle on the mounting bracket, the nozzle adopts the hollow awl nozzle of high-efficient one-way double-end.
The invention also provides a method for preventing the blockage corrosion problem of the low-temperature economizer, which comprises the following steps: spraying alkaline absorbent into flue in front of low-temperature economizer of coal-fired power plant by using acid-base reaction principle to remove SO in flue gas3Trapping in advance to avoid SO in the flue gas3After being condensed and condensed in the low-temperature economizer, the condensed ammonia reacts with ammonia escaping from the SCR denitration device to generate ammonium bisulfate which is deposited to block the low-temperature economizer. The method for preventing the corrosion problem caused by the blockage of the low-temperature economizer is implemented by adopting the device and comprises the following specific steps:
the method comprises the following steps: adding an alkaline absorbent into a stock bin, and adding the alkaline absorbent into a dissolving tank according to calculated amount through a spiral weighing feeder;
step two: adding the process water into a dissolving tank according to the calculated proportion, simultaneously stirring by a top-entry stirrer, uniformly mixing the process water and the alkaline absorbent in the dissolving tank, discharging the solution in which the alkaline solution is deteriorated due to precipitation in the dissolving tank or other reasons through a sewage discharge outlet, and ensuring the quality of the alkaline absorbent in the dissolving tank;
step three, spraying the uniformly mixed alkaline absorbent into the inlet flue of the low-temperature economizer through a spray head assembly by using a conveying pump or a standby conveying pump, mixing the alkaline absorbent with the flue gas, and capturing SO in the flue gas before the flue gas enters the low-temperature economizer3Avoiding condensation and deposition in the low-temperature economizer device; the output of the delivery pump or the standby delivery pump is controlled by a flowmeter and a flow pressure gauge, and further the flow of the alkaline absorbent sprayed into the flue is controlled.
Compared with the prior art, the invention has the following advantages and effects: 1. by utilizing the acid-base neutralization principle, an alkaline absorbent spraying device is arranged in a flue at the front end of the low-temperature economizer, and SO in the flue gas is removed before the flue gas enters the low-temperature economizer3Neutralization removal is carried out, so that the low-temperature coal economizer is prevented from being blocked and corroded by ammonium bisulfate, the running risk of the low-temperature coal economizer is reduced, and the environmental protection benefit and the energy saving benefit of the low-temperature electric dust remover are ensured; 2. the device does not increase the resistance of the air and smoke systemThe running power consumption and the dosing cost of the newly added device are slightly increased, but the problem of the blocking corrosion of the low-temperature economizer is greatly prevented, the running safety and the stability of the low-temperature economizer are greatly improved, the low-temperature economizer can run under the designed conditions with the maximum output, and compared with the running effect of the low-temperature economizer with the blocking corrosion, the environmental protection benefit and the energy saving benefit are considerable.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: the device comprises a storage bin 1, a spiral weighing feeder 2, a process water inlet 3, a sewage outlet 4, a jacking stirrer 5, a dissolving tank 6, a delivery pump 7, a standby delivery pump 8, a flowmeter 9, a flow pressure gauge 10, a spray head assembly 11, a first valve 12, a second valve 13 and a third valve 14.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, the embodiment discloses a device for preventing corrosion caused by blockage of a low-temperature economizer, which comprises a storage bin 1, a spiral weighing feeder 2, a dissolving tank 6, a delivery pump 7 and a spray head assembly 11. The storage bin 1 is filled with SO capable of being mixed with the flue gas3The alkaline absorbent for reaction is in powder form, and is usually selected from sodium-based inorganic salt or calcium-based inorganic salt. The discharge port of the storage bin 1 is connected with the inlet end of the spiral weighing feeder 2 through a pipeline, the outlet end of the spiral weighing feeder 2 is connected with the inlet end of the dissolving tank 6 through a pipeline, and the spiral weighing feeder 2 is used for fixingThe alkaline absorbent is added in a quantity to the dissolving tank 6.
In this embodiment, a top-feed agitator 5 for fully dissolving the alkaline absorbent is installed in the dissolving tank 6, a process water inlet 3 is provided at the upper part of the dissolving tank 6, a sewage outlet 4 is provided at the bottom, and a first valve 12 is installed at the sewage outlet 4. The water of the process water inlet 3 is from process water or city water.
In this embodiment, the outlet end of the dissolving tank 6 is connected to the inlet end of the delivery pump 7 through a pipeline, and a second valve 13 is installed on the connecting pipeline between the outlet end and the inlet end. The outlet end of the delivery pump 7 is connected with the spray head assembly 11 through a pipeline, and a flow meter 9, a flow pressure gauge 10 and a third valve 14 are sequentially arranged on the connecting pipeline of the delivery pump and the spray head assembly according to the liquid delivery direction.
In this embodiment, the shower nozzle subassembly 11 is installed inside low temperature economizer flue gas inlet flue, and low temperature economizer flue gas inlet flue is connected with SCR denitrification facility, and SCR denitrification facility is connected with the boiler, and low temperature economizer exhanst gas outlet flue is connected with electrostatic precipitator. The spray head assembly 11 comprises a mounting frame which is a grating and a plurality of nozzles which are arranged on the mounting frame, and the nozzles adopt high-efficiency one-way double-head hollow cone nozzles. Alkaline absorbent in the storage bin 1 enters the dissolving tank 6 to be dissolved and then is sprayed into the flue gas inlet flue of the low-temperature and low-temperature economizer through the spray head assembly 11 under the action of the delivery pump 7, and the alkaline absorbent is used for capturing SO in the flue gas3Before the flue gas enters a low-temperature economizer, SO in the flue gas is removed3And neutralization removal is carried out, so that the low-temperature coal economizer is prevented from being blocked and corroded by ammonium bisulfate, the running risk of the low-temperature coal economizer is reduced, and the environmental protection benefit and the energy saving benefit of the low-temperature electric dust remover are ensured.
This device of corrosion problem is blockked up to low temperature economizer of prevention still includes reserve delivery pump 8, and reserve delivery pump 8 sets up with delivery pump 7 side by side, and the one end and No. two valves 13 of reserve delivery pump 8 are connected, and the other end and the flowmeter 9 of reserve delivery pump 8 are connected. The standby delivery pump 8 and the delivery pump 7 both adopt variable-frequency delivery pumps. And adjusting the output of the variable-frequency delivery pump according to the load change of the coal-fired unit, controlling the injection flow of the alkaline absorbent injected into the flue, and metering specific parameters by using a flowmeter and a pressure gauge.
The embodiment also discloses a method for preventing the blockage corrosion problem of the low-temperature economizer, which comprises the following steps: spraying alkaline absorbent into flue in front of low-temperature economizer of coal-fired power plant by using acid-base reaction principle to remove SO in flue gas3Trapping in advance to avoid SO in the flue gas3The method is implemented by adopting the device for preventing the blockage corrosion problem of the low-temperature economizer, and specifically comprises the following steps of:
the method comprises the following steps: adding an purchased alkaline absorbent (powder) into a stock bin 1, and adding the alkaline absorbent (powder) into a dissolving tank 6 according to calculated amount through a screw weighing feeder 2;
step two: adding urban reclaimed water or process water into a dissolving tank 6 according to a calculated proportion, simultaneously stirring by a jacking stirrer 5, uniformly mixing the process water and an alkaline absorbent in the dissolving tank 6, discharging a solution in which the alkaline solution is deteriorated due to precipitation in the dissolving tank 6 or other reasons through a sewage discharge outlet 4, and ensuring the quality of the alkaline absorbent in the dissolving tank 6;
step three, spraying the uniformly mixed alkaline absorbent into the inlet flue of the low-temperature economizer through a spray head assembly 11 by using a conveying pump 7 or a standby conveying pump 8 to be mixed with the flue gas, and capturing SO in the flue gas before the flue gas enters the low-temperature economizer3Avoiding condensation and deposition in the low-temperature economizer device; the output of the delivery pump 7 or the standby delivery pump 8 (one for standby) is controlled by a flowmeter 9 and a flow pressure gauge 10, and the flow of the alkaline absorbent sprayed into the flue is further controlled.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides a device of low temperature economizer jam corrosion problem which characterized in that: comprises a storage bin (1), a dissolving tank (6), a delivery pump (7) and a spray head assembly (11); the storage bin (1) is filled with SO capable of being mixed with the flue gas3A reactive alkaline absorbent; the spray head assembly (11) is arranged inside a flue gas inlet of the low-low temperature economizer; feed bin (1), dissolving tank (6), delivery pump (7) and shower nozzle subassembly (11) are connected in order through the pipeline, and alkaline absorbent in feed bin (1) enters into dissolving tank (6) and dissolves the back and sprays inside low temperature economizer flue gas entry flue through shower nozzle subassembly (11) under the effect of delivery pump (7).
2. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 1, wherein: install spiral weighing feeder (2) between feed bin (1) and dissolving tank (6), the discharge gate of feed bin (1) passes through the tube coupling with the entrance point of spiral weighing feeder (2), and the exit end of spiral weighing feeder (2) passes through the entrance point connection of pipeline and dissolving tank (6).
3. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 1, wherein: a top-feed stirrer (5) for sufficiently dissolving the alkaline absorbent is installed in the dissolving tank (6).
4. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 1, wherein: the upper part of the dissolving tank (6) is provided with a process water inlet (3), the bottom of the dissolving tank is provided with a sewage outlet (4), and a first valve (12) is arranged at the sewage outlet (4).
5. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 1, wherein: a second valve (13) is arranged on a connecting pipeline between the dissolving tank (6) and the delivery pump (7), and a flow meter (9), a flow pressure gauge (10) and a third valve (14) are sequentially arranged on the connecting pipeline between the delivery pump (7) and the spray head assembly (11) according to the liquid delivery direction.
6. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 5, wherein: the device still includes reserve delivery pump (8), reserve delivery pump (8) set up side by side with delivery pump (7), and the one end and No. two valves (13) of reserve delivery pump (8) are connected, and the other end and flowmeter (9) of reserve delivery pump (8) are connected.
7. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 6, wherein: the standby delivery pump (8) and the delivery pump (7) both adopt variable-frequency delivery pumps.
8. The apparatus for preventing clogging corrosion problem of a low-temperature economizer according to claim 1, wherein: shower nozzle subassembly (11) include one and are the mounting bracket of grid and install a plurality of nozzle on the mounting bracket, the nozzle adopts the hollow awl nozzle of high-efficient one-way double-end.
9. A method for preventing the problem of blockage corrosion of a low-temperature economizer is characterized by comprising the following steps: spraying alkaline absorbent into flue in front of low-temperature economizer of coal-fired power plant by using acid-base reaction principle to remove SO in flue gas3Trapping in advance to avoid SO in the flue gas3After being condensed and condensed in the low-temperature economizer, the condensed ammonia reacts with ammonia escaping from the SCR denitration device to generate ammonium bisulfate which is deposited to block the low-temperature economizer.
10. The method for preventing low and low temperature economizer blockage corrosion problems as recited in claim 9, wherein: the method is implemented by adopting the device of any one of claims 1 to 8, and comprises the following specific steps:
the method comprises the following steps: adding an alkaline absorbent into a stock bin (1), and adding the alkaline absorbent into a dissolving tank (6) according to calculated amount through a spiral weighing feeder (2);
step two: adding process water into a dissolving tank (6) according to a calculated proportion, simultaneously stirring by a jacking stirrer (5), uniformly mixing the process water and an alkaline absorbent in the dissolving tank (6), discharging a solution which is precipitated in the dissolving tank (6) or is deteriorated by the alkaline solution due to other reasons through a sewage discharge outlet (4), and ensuring the quality of the alkaline absorbent in the dissolving tank (6);
step three, spraying the uniformly mixed alkaline absorbent into the flue at the inlet of the low-temperature economizer through a spray head assembly (11) by a delivery pump (7) or a standby delivery pump (8), mixing the alkaline absorbent with the flue gas, and capturing SO in the flue gas before the flue gas enters the low-temperature economizer3Avoiding condensation and deposition in the low-temperature economizer device; the output of the delivery pump (7) or the spare delivery pump (8) is controlled by a flowmeter (9) and a flow pressure gauge (10), and the flow of the alkaline absorbent sprayed into the flue is further controlled.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090078177A1 (en) * | 2007-09-25 | 2009-03-26 | Song Wu | Methods and apparatus for performing flue gas pollution control and/or energy recovery |
| CN105854575A (en) * | 2016-04-26 | 2016-08-17 | 华北电力大学（保定） | A method for simultaneous treatment of SO3 and desulfurization wastewater in flue gas of coal-fired power plants |
| CN106345244A (en) * | 2016-10-17 | 2017-01-25 | 浙江大学 | Device and method for removing sulfur trioxide from coal-fired flue gas |
| CN206008457U (en) * | 2016-08-23 | 2017-03-15 | 华电电力科学研究院 | Before and after a kind of joint removing SCR denitration device in flue gas SO3 and flue dust device |
| CN106964243A (en) * | 2017-03-29 | 2017-07-21 | 华电电力科学研究院 | A kind of integrative coordinated removing sulfur trioxide device and its method of work suitable for sulphur coal |
| CN107029546A (en) * | 2017-04-20 | 2017-08-11 | 北京国电龙源环保工程有限公司 | SO based on alkaline absorbent fine particle3Removing system and its removal methods |
| CN206868000U (en) * | 2017-04-21 | 2018-01-12 | 北京国电龙源环保工程有限公司 | SO3 front end removing system in coal-fired flue-gas |
| CN206897142U (en) * | 2017-03-29 | 2018-01-19 | 华电电力科学研究院 | A kind of integrative coordinated removing sulfur trioxide device suitable for sulphur coal |
| CN209451649U (en) * | 2018-11-02 | 2019-10-01 | 浙江菲达环保科技股份有限公司 | A kind of gas mercury sulphur cooperation-removal device based on solution injection |
| CN110801723A (en) * | 2019-10-17 | 2020-02-18 | 浙江浙能技术研究院有限公司 | Method for removing SO in coal-fired flue gas by base injection3Pilot test device and method |
| CN111111421A (en) * | 2019-12-16 | 2020-05-08 | 山东电力工程咨询院有限公司 | Device and method for improving utilization rate of absorbent in sulfur trioxide removal process |
-
2020
- 2020-08-14 CN CN202010820209.8A patent/CN112221332A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090078177A1 (en) * | 2007-09-25 | 2009-03-26 | Song Wu | Methods and apparatus for performing flue gas pollution control and/or energy recovery |
| CN105854575A (en) * | 2016-04-26 | 2016-08-17 | 华北电力大学（保定） | A method for simultaneous treatment of SO3 and desulfurization wastewater in flue gas of coal-fired power plants |
| CN206008457U (en) * | 2016-08-23 | 2017-03-15 | 华电电力科学研究院 | Before and after a kind of joint removing SCR denitration device in flue gas SO3 and flue dust device |
| CN106345244A (en) * | 2016-10-17 | 2017-01-25 | 浙江大学 | Device and method for removing sulfur trioxide from coal-fired flue gas |
| CN106964243A (en) * | 2017-03-29 | 2017-07-21 | 华电电力科学研究院 | A kind of integrative coordinated removing sulfur trioxide device and its method of work suitable for sulphur coal |
| CN206897142U (en) * | 2017-03-29 | 2018-01-19 | 华电电力科学研究院 | A kind of integrative coordinated removing sulfur trioxide device suitable for sulphur coal |
| CN107029546A (en) * | 2017-04-20 | 2017-08-11 | 北京国电龙源环保工程有限公司 | SO based on alkaline absorbent fine particle3Removing system and its removal methods |
| CN206868000U (en) * | 2017-04-21 | 2018-01-12 | 北京国电龙源环保工程有限公司 | SO3 front end removing system in coal-fired flue-gas |
| CN209451649U (en) * | 2018-11-02 | 2019-10-01 | 浙江菲达环保科技股份有限公司 | A kind of gas mercury sulphur cooperation-removal device based on solution injection |
| CN110801723A (en) * | 2019-10-17 | 2020-02-18 | 浙江浙能技术研究院有限公司 | Method for removing SO in coal-fired flue gas by base injection3Pilot test device and method |
| CN111111421A (en) * | 2019-12-16 | 2020-05-08 | 山东电力工程咨询院有限公司 | Device and method for improving utilization rate of absorbent in sulfur trioxide removal process |
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