CN105526577A - Control-stable low-low-temperature coal economizer system - Google Patents
Control-stable low-low-temperature coal economizer system Download PDFInfo
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- CN105526577A CN105526577A CN201510972237.0A CN201510972237A CN105526577A CN 105526577 A CN105526577 A CN 105526577A CN 201510972237 A CN201510972237 A CN 201510972237A CN 105526577 A CN105526577 A CN 105526577A
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- low
- gas
- economizer
- stack
- temperature
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- 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
- F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
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- 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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
Abstract
The invention relates to a control-stable low-low-temperature coal economizer system. The system comprises a low-low-temperature coal economizer, a water feed connecting pipe and a water outlet connecting pipe connected with the low-low-temperature coal economizer, and a recirculating pump set and an adjusting control valve set connected with the low-low-temperature coal economizer through the water feed connecting pipe and the water outlet connecting pipe; the adjusting control valve set controls through an adjusting valve control device according to a smoke temperature on the back side of the low-low-temperature coal economizer; and the recirculating pump set controls through a recirculating pump control device according to a water temperature of a water inlet of the low-low-temperature coal economizer. The system uses the adjusting control valve set and the recirculating pump set for controlling the flow and the temperature of condensed water entering the low-low-temperature coal economizer, and stably controls the smoke temperature cooled by the low-low-temperature coal economizer at a set value; and when acid corrosion of the low-low-temperature coal economizer is prevented, and the equipment operation safety is guaranteed, importantly, the electric dust removing efficiency is greatly improved, and the dust and SO3 content in smoke are largely decreased and reach the emission standard.
Description
Technical field
the present invention relates to the low low-level (stack-gas) economizer system of a kind of Absorbable organic halogens regulation and control, belong to station boiler equipment technical field.
Background technology
coal fired power generation will be the major way of the production of energy of China within the following quite a long time.And a large amount of pollutants that coal produces in combustion, as flue dust, sulfide etc., it is the main source of atmosphere pollution, serious threat is had to the healthy of the mankind, associating State General Administration for Quality Supervision of national environmental protection portion has issued " fossil-fuel power plant atmospheric pollutant emission standard " the tightest in history for this reason, proposes harsh requirement to the environmental emission reduction of coal unit.In order to the pollutant emission solving coal unit problem up to standard, applicant develop and develop with high-efficiency electric dust catcher with the use of low low-level (stack-gas) economizer system, be applied to in-service or newly-built coal unit, the flue gas pollutant of coal unit is discharged and is inhibited, reduction of discharging obtains immense success.The technical method that this low low-level (stack-gas) economizer system is dealt with problems is: before electric cleaner, cloth sets low low-level (stack-gas) economizer system, by the heat exchange effect of low low-level (stack-gas) economizer system, the flue-gas temperature (usually at about 135 °) from air preheater is reduced to the high-effective dust-removing temperature range (generally at about 90 °) of electric cleaner, thus substantially increase the efficiency of dust collection of electric cleaner, effectively reduce soot emissions, sulfur trioxide (SO3) in flue gas acid dew-point temperature (conventional at about 100-120 °) below time condense into liquid state and adhere on flue gas neutral and alkali ash particle, and the overwhelming majority and ash particle together remove in electric cleaner, thus the SO3 content in flue gas is reduced, and the reduction of temperature decreases flue gas volume amount, effectively reduce the operation power consumption of air-introduced machine, reduce power consumption, low low-level (stack-gas) economizer system is connected with low-pressure heating system, the transfer of heat that condensed water is absorbed at low low-level (stack-gas) economizer and flue gas heat exchange is used to low-pressure heating system, improve the overall operation efficiency (as shown in Figure 1) of unit.
but, also there is such defect in actual applications in existing this low low-level (stack-gas) economizer system: because the heat exchange area of low low-level (stack-gas) economizer is designing the production phase namely to determine, therefore at product export with after installing, the setting heat exchange amount of low low-level (stack-gas) economizer is difficult to adjust in coal unit running, when there is the situation of fluctuation in flue-gas temperature under the operating modes such as coal unit load adjustment or fire coal species change, the flue-gas temperature of lowering the temperature through low low-level (stack-gas) economizer is just difficult to accurately control the electric cleaner high-effective dust-removing temperature range in setting, this will the extreme influence high-effective dust-removing of electric cleaner, flue gas smoke content after dedusting is still higher, and also serious acid corrosion hidden danger is brought to back-end ductwork without the SO3 removed in flue gas, meanwhile, when condensate temperature is lower, low low-level (stack-gas) economizer also there will be cold end corrosion.
Summary of the invention
the present invention's low low-level (stack-gas) economizer mainly solved existing for prior art cannot carry out in coal unit running to the cooling of flue gas that instant regulation and control cause dust collection efficiency greatly to reduce, the technical problem of acid corrosion increased risk, provides a kind of and immediately can regulate and control the low low-level (stack-gas) economizer system that the cooling of low low-level (stack-gas) economizer to flue gas makes dust collection efficiency stability and high efficiency and anacidity corrosion risk in coal unit running.
the present invention is mainly solved by following technical proposals above-mentioned technical problem: the present invention includes low low-level (stack-gas) economizer, by feedwater tube connector be connected with low low-level (stack-gas) economizer water inlet to water end (W.E.), by the water side that water outlet tube connector is connected with low low-level (stack-gas) economizer delivery port, it is characterized in that: also comprise the recirculation pump group that outlet is connected with feedwater tube connector, entrance is connected with feedwater tube connector and exports than recirculation pump group closer to the adjusting control valve group of water end (W.E.), the entrance of recirculation pump group is connected with water outlet tube connector, the outlet of adjusting control valve group is connected with water outlet tube connector and than recycling pump inlet closer to water side, the low low-level (stack-gas) economizer rear portion flue-gas temperature that adjusting control valve group is provided according to flue gas temperature measuring equipment by regulating valve control device controls, the water inlet water temperature that recirculation pump group is provided according to temperature detector by recirculation pump control device controls.
as preferably, also comprise two ends respectively with the normally closed gate valve be connected with water side to water end (W.E.).
therefore, structure of the present invention is simple, stable, reliable, has following feature:
the present invention arranges adjusting control valve group and recirculation pump group between the water inlet and delivery port of low low-level (stack-gas) economizer, regulated and controled by the condensate flow entering low low-level (stack-gas) economizer water inlet to water end (W.E.) by adjusting control valve group, to realize accurately controlling the inflow condensed water of low low-level (stack-gas) economizer and the heat exchange amount of flue gas, and then the flue-gas temperature of lowering the temperature through too low low-level (stack-gas) economizer is stably controlled in setting value, thus the efficiency of dust collection of electric cleaner is improved greatly, flue dust in coal unit flue gas and the discharge of SO3 are inhibited and reach discharge standard, the acid corrosion risk of back-end ductwork is avoided, by recirculation pump group, the water temperature of low low-level (stack-gas) economizer water inlet is controlled more than setting value, effectively prevent low low-level (stack-gas) economizer and occur cold end corrosion.
Accompanying drawing explanation
accompanying drawing 1 is the schematic diagram that prior art is arranged in coal unit;
accompanying drawing 2 is schematic diagrames of the present invention;
accompanying drawing 3 is schematic diagrames that the present invention is arranged in coal unit.
Detailed description of the invention
below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
embodiment 1: as shown in Figure 2, the present invention includes low low-level (stack-gas) economizer 1, by feedwater tube connector 2 be connected with low low-level (stack-gas) economizer 1 water inlet to water end (W.E.) 3, by the water side 5 that water outlet tube connector 4 is connected with low low-level (stack-gas) economizer 1 delivery port, export the recirculation pump group 6 be connected with feedwater tube connector 2, the adjusting control valve group 7 that entrance is connected with feedwater tube connector 2, adjusting control valve group 7 entrance and the position that is connected of feedwater tube connector 2 exports the position that is connected with the tube connector 2 that feeds water closer to the front end of water end (W.E.) 3 than recirculation pump group 6, recirculation pump group 6 entrance is connected with water outlet tube connector 4, adjusting control valve group 7 export to be connected with water outlet tube connector 4 and the position that is connected with water outlet tube connector 4 than recirculation pump group 6 entrance of link position closer to water side 5, the low low-level (stack-gas) economizer 1 rear portion flue-gas temperature that adjusting control valve group 7 is provided according to flue gas temperature measuring equipment 11 by regulating valve control device 8 controls, the low low-level (stack-gas) economizer 1 water inlet water temperature that recirculation pump group 6 is provided according to temperature detector 12 by recirculation pump control device 9 controls, also comprise two ends respectively with to the normally closed gate valve 10 that is connected with water side 5 of water end (W.E.) 3.
when the present invention is arranged in 350MW subcritical coal unit (as shown in Figure 3), low low-level (stack-gas) economizer 1 to be arranged in horizontal flue 13 and between air preheater 14 and electric cleaner 15, be connected to the outlet of water end (W.E.) 3 with the low-pressure heater 17 of water temperature between 70 DEG C to 80 DEG C, water side 5 is connected with the entrance of low-pressure heater 16, and low low-level (stack-gas) economizer 1 is serially connected with between low-pressure heater 17 and low-pressure heater 16.Flue-gas temperature from air preheater 13 is 135 DEG C when BMCR design conditions, enter low low-level (stack-gas) economizer 1 cooled after, flue-gas temperature is down to 90 DEG C, the flue gas that cigarette temperature is reduced to 90 DEG C enters after electric cleaner 15 by high-effective dust-removing, make the discharge of flue dust and SO3 in the flue gas of coal unit be effectively suppressed and reach discharge standard, the acid corrosion risk of back-end ductwork is also avoided simultaneously; Obtain to raise and import in low-pressure heater 16 through water side 5 by temperature after low low-level (stack-gas) economizer 1 and flue gas heat exchange from the condensed water of low-pressure heater 17 and be used, improve the overall thermal efficiency of coal unit.
the present invention is in coal unit running, low low-level (stack-gas) economizer 1 is not all entered by the condensed water flowing into water end (W.E.) 3, a part directly branches to water side 5 via adjusting control valve group 7 and flows out, when the reasons such as coal unit load variations or coal type change make the flue-gas temperature from air preheater 13 occur fluctuation, regulating valve control device 8 is according to the feedback of flue gas temperature measuring equipment 11, timely control and regulation control valve group 7 pairs of condensate flows regulate, thus regulate according to the flue-gas temperature of fluctuation entering the condensate flow that low low-level (stack-gas) economizer 1 participates in heat exchange, low low-level (stack-gas) economizer 1 is made to measure instant adjustment and control with the heat exchange of flue gas, therefore the flue gas of different temperatures is after too low low-level (stack-gas) economizer 1 heat exchange cooling, control to flue-gas temperature all-the-time stable 90 DEG C in setting, in order to more effectively prevent low low-level (stack-gas) economizer 1 not by cold end corrosion, low low-level (stack-gas) economizer 1 heat exchanger tube wall temperature is necessary to control on aqueous dew point temperature (as 72 DEG C), owing to also can change from the condensate temperature of low-pressure heater 17 under different operating mode, now recirculation pump group 6 is taken out a road hot water from low low-level (stack-gas) economizer 1 delivery port and is carried out Hybrid Heating to low low-level (stack-gas) economizer 1 water inlet to the condensed water of low temperature, recirculation pump control device 9 is according to the temperature feedback of temperature detector 12, control the control allotment that recirculation pump group 6 carries out recirculation water flow in real time, can guarantee low low-level (stack-gas) economizer 1 water inlet water temperature to control like this in setting value 72 DEG C (or on), effectively prevent low low-level (stack-gas) economizer 1 and occur cold end corrosion.
normally closed gate valve 10 of the present invention is in closed condition under normal circumstances as valve for subsequent use, the present invention break down or stop using etc. situation time can open, from low-pressure heater 17 condensed water by give water end (W.E.) 3 directly flow out to low-pressure heater 16 through water side 5.
certainly, the present invention is applicable to the Thermal generation unit of various grading scale, above-mentioned drawings and Examples only in order to for explain and illustrate the present invention, can not as improper restriction of the present invention.The coal unit scale that such as the present invention is suitable for, low low-level (stack-gas) economizer 1 water inlet water temperature value, the flue 13 that low low-level (stack-gas) economizer 1 is arranged is horizontal flue or vertical gas pass etc., is all to carry out adjusting and changing according to the actual conditions of coal unit.The technical scheme that all those skilled in the art make equivalence or equivalent adjustment and change according to the present invention and obtain all falls into protection scope of the present invention.
Claims (2)
1. the low low-level (stack-gas) economizer system of Absorbable organic halogens regulation and control, comprise low low-level (stack-gas) economizer (1), by feedwater tube connector (2) be connected with described low low-level (stack-gas) economizer (1) water inlet to water end (W.E.) (3), by the water side (5) that water outlet tube connector (4) is connected with described low low-level (stack-gas) economizer (1) delivery port, it is characterized in that: also comprise the recirculation pump group (6) exporting and be connected with described feedwater tube connector (2), entrance is connected with described feedwater tube connector (2) and exports closer to described to the adjusting control valve group (7) of water end (W.E.) (3) than described recirculation pump group (6), described recirculation pump group (6) entrance is connected with described water outlet tube connector (4), the outlet of described adjusting control valve group (7) is connected with described water outlet tube connector (4) and than described recirculation pump group (6) entrance closer to described water side (5), described low low-level (stack-gas) economizer (1) the rear portion flue-gas temperature that described adjusting control valve group (7) is provided according to flue gas temperature measuring equipment (11) by regulating valve control device (8) controls, described low low-level (stack-gas) economizer (1) the water inlet water temperature that described recirculation pump group (6) is provided according to temperature detector (12) by recirculation pump control device (9) controls.
2. the low low-level (stack-gas) economizer system of a kind of Absorbable organic halogens regulation and control according to claim 1, is characterized in that: also comprise two ends respectively with the described normally closed gate valve (10) be connected to water end (W.E.) (3) and described water side (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510972237.0A CN105526577B (en) | 2015-12-22 | 2015-12-22 | The low low-level (stack-gas) economizer system of regulation and control can be stablized |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510972237.0A CN105526577B (en) | 2015-12-22 | 2015-12-22 | The low low-level (stack-gas) economizer system of regulation and control can be stablized |
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| CN105526577A true CN105526577A (en) | 2016-04-27 |
| CN105526577B CN105526577B (en) | 2018-05-15 |
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Cited By (3)
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|---|---|---|---|---|
| CN107036114A (en) * | 2017-05-15 | 2017-08-11 | 华电电力科学研究院 | A kind of modified flue gas cooling and dust pelletizing system and method |
| CN109210557A (en) * | 2017-07-07 | 2019-01-15 | 清华大学 | A kind of boiler system and method using high-alkali coal |
| CN111637440A (en) * | 2020-05-24 | 2020-09-08 | 西安交通大学 | Configuration self-adaptive flexible clean cooperative coal-fired power generation system and operation method |
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| CN205299475U (en) * | 2015-12-22 | 2016-06-08 | 东方菱日锅炉有限公司 | Low low -level (stack -gas) economizer system that can stably regulate and control |
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| US20110131993A1 (en) * | 2009-12-05 | 2011-06-09 | Alstom Technology Ltd | Steam power plant with heat reservoir and method for operating a steam power plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107036114A (en) * | 2017-05-15 | 2017-08-11 | 华电电力科学研究院 | A kind of modified flue gas cooling and dust pelletizing system and method |
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| CN109210557A (en) * | 2017-07-07 | 2019-01-15 | 清华大学 | A kind of boiler system and method using high-alkali coal |
| CN111637440A (en) * | 2020-05-24 | 2020-09-08 | 西安交通大学 | Configuration self-adaptive flexible clean cooperative coal-fired power generation system and operation method |
| WO2021238320A1 (en) * | 2020-05-24 | 2021-12-02 | 西安交通大学 | Configuration-adaptive flexible cleaning coordinated coal-fired power generation system and operation method |
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| CN105526577B (en) | 2018-05-15 |
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