CN103801187B - A kind of apparatus and method determining the suitable heating-up temperature of wet desulphurization smoke evacuation - Google Patents
A kind of apparatus and method determining the suitable heating-up temperature of wet desulphurization smoke evacuation Download PDFInfo
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- CN103801187B CN103801187B CN201410050182.3A CN201410050182A CN103801187B CN 103801187 B CN103801187 B CN 103801187B CN 201410050182 A CN201410050182 A CN 201410050182A CN 103801187 B CN103801187 B CN 103801187B
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Abstract
Determine apparatus and method for the suitable heating-up temperature of wet desulphurization smoke evacuation, belong to Wet Flue Gas Desulfurization Technique field.The flue that it comprises chimney and communicates with chimney bottom, flue sets gradually heating front temperature measuring equipment, heater, temperature after heating measurement mechanism and flue gas dynamic pressure measurement device, chimney top arranges chimney region dry-bulb temperature measurement mechanism and chimney region wet bulb temperature measuring device from top to bottom.The present invention is by this measurement mechanism and method, determine the heating-up temperature be suitable for, its structure is simple, easy to operate, test is accurate, by the temperature after operation heating, control flue-gas temperature, avoid the generation of gypsum rain, meet the requirement of environmental protection, and its defining method is easy, by demarcating, determine the flue gas reheat temperature that an economy is suitable, both avoid gypsum rain, again saved the energy required for heating, be applicable to the clean flue gas reheat system of power plant's wet desulphurization, improve environmental benefit and the economic benefit of power plant, be suitable for applying.
Description
Technical field
The invention belongs to Wet Flue Gas Desulfurization Technique field, be specifically related to a kind of apparatus and method determining wet desulfurization flue gas exhaust temperature.
Background technology
At present, in the flue gas desulphurization system of domestic employing, the effect of desulfurization is best in a wet process.But the white cigarette produced in process of wet desulphurization causes acid pollution and visual pollution.The method solving white cigarette mainly heats flue gas after desulfurization or dehumidifies to flue gas after desulfurization.Wet desulfurization system absorption tower exit gas temperature at about 50 DEG C, moisture-saturated.Flue gas can improve the rising height of flue gas, is conducive to the diffusion of pollutant, avoids the generation of misty rain phenomenon.Regulation in DL/T5196 1 " Coal,steam plant with FGD designing technique code ": " flue gas system should install flue gas heat-exchange unit, and under design conditions, the flue-gas temperature of desulfurization after funnel entrance generally should reach 80 DEG C and above discharge ".If do not arrange flue gas heating system, the temperature of smoke stack emission is only about 50 DEG C, and flue gas, containing more water, can cause following problem: the corrosivity of (1) 50 DEG C of flue gas is much higher than 80 DEG C, causes chimney must adopt expensive resistant material; (2) flue gas water content senior general causes gypsum particle to discharge chimney, and drops on region very near around chimney, causes " gypsum rain ", affects power plant's plant environment, do not meet environmental requirement.In order to make exhaust gas temperature reach on dew point, alleviating the corrosion to clean flue and chimney, improving the diffusance of pollutant, the method adopting lifting neat stress temperature more.At present, swinging GGH (gas-gas heat exchange formula) scheme, SGH (steam, the flue gas heat exchange formula) method such as scheme, pipe heat exchanger scheme are mainly adopted to raising chimney inlet flue gas temperature both at home and abroad.Swinging GGH scheme is in the exhaust pass of absorption tower, install back rotatable GGH heat exchanger, it utilizes boiler tail high-temperature flue gas to heat the low temperature neat stress of absorption tower outlet, neat stress temperature is raised, to guarantee to be not less than 65 ~ 70 DEG C at the entrance flue gas temperature of various operating mode lower stack, condensate water is avoided to separate out.SGH scheme installs SGH heat exchanger in the exhaust pass of absorption tower, high-temperature steam is utilized to heat the low temperature neat stress of absorption tower outlet, neat stress temperature is raised, to guarantee to be not less than 65 ~ 70 DEG C at the entrance flue gas temperature of various operating mode lower stack, avoids condensate water to separate out.Pipe heat exchanger scheme installs pipe heat exchanger in the exhaust pass of absorption tower, is used for improving the flue-gas temperature after the washing of absorption tower.Pipe heat exchanger body is arranged in adsorption tower smoke outlet side, and former flue gas enters in pipe type heat transfer organ pipe by flue, after heat exchange cooling, enter absorption tower.Neat stress after desulfurization flows through outside tubular type Tube Sheet of Heat Exchanger, absorbs the heat of former flue gas release.For the prior art of these three kinds of methods, Chinese patent CN202263519U discloses a kind of hybrid GGH device, in order to promote wet-method desulfurized fume temperature; Chinese patent CN102012036A discloses a kind of composite phase-change device in order to promote neat stress temperature after wet desulphurization; Chinese patent CN102121703A discloses one high-temperature flue gas and adds neat stress temperature methods after thermally desulfurizing.But these methods all do not point out the flue-gas temperature how determining to need lifting, namely flue gas just can avoid white cigarette to many high-temperature discharges.If heating-up temperature is too low, do not have the effect stoping white cigarette, if it is not heating-up temperature is too high, energy-conservation.Similar to the method adding heat smoke, also there is the technology adopting flue gas directly to dehumidify, such as: Chinese patent CN202683357U discloses a kind of interior whirlpool gas-liquid separation device eliminating the white cigarette of desulfuration chimney, by drop in reduction flue gas to weaken white cigarette phenomenon; Chinese patent CN102600712A discloses and a kind ofly eliminates the method that solid waste flies less white cigarette, and by cold for the neat stress after desulfurization Dehumidifying by HRV, be reduced to 70% relative humidity, then discharge enters chimney.These methods need a method determining flue-gas temperature equally.In addition, Chinese patent CN102661975A discloses a kind of method of on-line measurement flue gas acid dew point, for measuring flue gas dew point, but does not propose suitable flue gas temperature.
Summary of the invention
Not enough for prior art, the object of the present invention is to provide a kind of apparatus and method determining wet desulphurization smoke evacuation preference temperature, for accurately determining suitable desulfurization fume exhaust gas temperature, avoiding the generation of gypsum rain.
Described a kind of device determining the suitable heating-up temperature of wet desulphurization smoke evacuation, the flue comprising chimney and communicate with chimney bottom, it is characterized in that described flue setting gradually heating front temperature measuring equipment, heater, temperature after heating measurement mechanism and flue gas dynamic pressure measurement device, described chimney top arranges chimney region dry-bulb temperature measurement mechanism and chimney region wet bulb temperature measuring device from top to bottom.
Described a kind of device determining the suitable heating-up temperature of wet desulphurization smoke evacuation, before it is characterized in that described heating, temperature measuring equipment, temperature after heating measurement mechanism and flue gas dynamic pressure measurement device bottom are arranged on flue medium position.
Described a kind of device determining the suitable heating-up temperature of wet desulphurization smoke evacuation, before it is characterized in that described heating, temperature measuring equipment, temperature after heating measurement mechanism, chimney region dry-bulb temperature measurement mechanism and chimney region wet bulb temperature measuring device are respectively thermometer.
A kind of described method determining the suitable heating-up temperature of wet desulphurization smoke evacuation, is characterized in that comprising the steps:
1) clean flue gas after wet desulphurization is entered flue, before flowing through the heating in flue, temperature measuring equipment records its temperature is T
1, then heat through heater, temperature improves, and recording its dynamic pressure by flue gas dynamic pressure measurement device after heating is △ P, then to record temperature through temperature after heating measurement mechanism be T
2, clean flue gas enters chimney again, up flows out from chimney bottom, discharges chimney, and recording temperature through the chimney region dry-bulb temperature measurement mechanism of chimney is T
3, recording temperature through chimney region wet bulb temperature measuring device is T
4;
2) it is T that the temperature after heating measurement mechanism in step 1) records temperature
2data are relevant with heater heating power, the temperature that this temperature determination flue gas is discharged, and namely for judging whether, gypsum rain occurring, having a theoretical heating-up temperature T when there is not gypsum rain
2', work as T
2>=T
2in ' time, can not gypsum rain be there is, then can according to theoretical heating-up temperature T
2', determine actual required heating-up temperature T
2value;
3) when there is not gypsum rain, theoretical heating-up temperature T
2' meet following formula: T
2'=k × △ P × (T
2'-T
1)/(T
3-T
4), wherein the unit of temperature is DEG C, and the unit of dynamic pressure is Pa, k is coefficient, and k needs to pass through field calibration;
4) k value is substituted in the computing formula of step 3), go out T according to this formulae discovery
2' value, T
2'+2 DEG C are the desired temperature that control does not produce gypsum rain reality;
5) suitable heating-up temperature T
2=T
2'+2 DEG C, this temperature is actually determined heating-up temperature, according to the heating power of this temperature determination heater.
A kind of described method determining the suitable heating-up temperature of wet desulphurization smoke evacuation, it is characterized in that the field calibration method of k in step 3): adopt ocular estimate, observe the generation of the outer gypsum rain of chimney, and write down the data T that when there is not gypsum rain, temperature after heating measurement mechanism (4) records
2, make T
2'=T
2, and by this temperature data T
2' and △ P, T of recording
1, T
3, T
4all substitute in the formula of step 3), calculate k value.
By adopting said apparatus and method, compared with prior art, beneficial effect of the present invention is as follows:
1) measurement mechanism structure of the present invention is simple, easy to operate, test is accurate, computational methods are easy, be applicable to coordinate with various heater, and it is convenient to suitable heating and temperature control, by the temperature after operation heating, control flue-gas temperature, avoid the generation of gypsum rain, meet the requirement of environmental protection;
2) suitable heating-up temperature defining method of the present invention is easy, the theoretical minimum heating-up temperature not producing gypsum rain is gone out by formulae discovery of the present invention, be identical with theoretical heating-up temperature by actual heating and temperature control again, the generation of gypsum rain can be avoided, also prevent heating-up temperature too high, consume a large amount of energy and improve financial cost; The present invention produces to effectively avoid gypsum rain, is higher than theoretical heating-up temperature 2 DEG C by actual heating and temperature control, on the one hand can avoid gypsum rain completely, also prevent temperature on the other hand too high and improve financial cost;
3) apparatus and method determining the suitable heating-up temperature of wet desulphurization smoke evacuation of the present invention, be applicable to the clean flue gas reheat system of power plant's wet desulphurization, can by demarcating, determine the flue gas reheat temperature that an economy is suitable, both gypsum rain was avoided, again save the energy required for heating, improve environmental benefit and the economic benefit of power plant, be suitable for applying.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-flue, temperature measuring equipment before 2-heating, 3-heater, 4-temperature after heating measurement mechanism, 5-flue gas dynamic pressure measurement device, 6-chimney, 7-chimney region dry-bulb temperature measurement mechanism, 8-chimney region wet bulb temperature measuring device.
Detailed description of the invention
Below in conjunction with Figure of description, the invention will be further described:
As shown in Figure 1, a kind of device determining the suitable heating-up temperature of wet desulphurization smoke evacuation, the flue 1 comprising chimney 6 and communicate with chimney bottom, described flue 1 sets gradually the front temperature measuring equipment 2 of heating, heater 3, temperature after heating measurement mechanism 4 and flue gas dynamic pressure measurement device 5, described chimney 6 top arranges chimney region dry-bulb temperature measurement mechanism 7 and chimney region wet bulb temperature measuring device 8 from top to bottom, temperature measuring equipment 2 before heating, temperature after heating measurement mechanism 4 and flue gas dynamic pressure measurement device 5 bottom are arranged on flue 1 medium position, and temperature measuring equipment 2 before heating, temperature after heating measurement mechanism 4, chimney region dry-bulb temperature measurement mechanism 7 and chimney region wet bulb temperature measuring device 8 are respectively thermometer.
The method determining the suitable heating-up temperature of wet desulphurization smoke evacuation of the present invention, comprises the steps:
1) clean flue gas after wet desulphurization is entered flue 1, before flowing through the heating in flue 1, temperature measuring equipment 2 records its temperature is T
1, then heat through heater 3, temperature improves, and recording its dynamic pressure by flue gas dynamic pressure measurement device 5 after heating is △ P, then to record temperature through temperature after heating measurement mechanism 4 be T
2, clean flue gas enters chimney 6 again, up flows out bottom chimney 6, discharges chimney 6, and recording temperature through the chimney region dry-bulb temperature measurement mechanism 7 of chimney 6 is T
3, recording temperature through chimney region wet bulb temperature measuring device 8 is T
4;
2) it is T that the temperature after heating measurement mechanism 4 in step 1) records temperature
2data are relevant with heater 3 heating power, the temperature that this temperature determination flue gas is discharged, and namely for judging whether, gypsum rain occurring, having a theoretical heating-up temperature T when there is not gypsum rain
2', work as T
2>=T
2in ' time, can not gypsum rain be there is, then can according to theoretical heating-up temperature T
2', determine actual required heating-up temperature T
2value;
3), when there is not gypsum rain, theoretical heating-up temperature T2 ' meets following formula: T
2'=k × △ P × (T
2'-T
1)/(T
3-T
4), wherein the unit of temperature is DEG C, and the unit of dynamic pressure is Pa, k is coefficient, and k needs by field calibration, the field calibration method of k: adopt ocular estimate, observe the generation of the outer gypsum rain of chimney, and write down the data T that when there is not gypsum rain, temperature after heating measurement mechanism 4 records
2, make T
2'=T
2, and by this temperature data T
2' and △ P, T of recording
1, T
3, T
4all substitute in the formula of step 3), calculate k value; Such as, during the generation of the outer gypsum rain of field observation chimney, now T
2it is 100 DEG C, by T
2'=T
2=100 DEG C, and each data △ P, T of measuring
1, T
3, T
4all substitute into T
2'=k × △ P × (T
2'-T
1)/(T
3-T
4) in formula, calculate the value of k;
4) the k value of field calibration is substituted in the computing formula of step 3), go out T according to this formulae discovery
2' value, T
2 '+ 2 DEG C are the temperature value that reality does not produce gypsum rain, suitable heating-up temperature T
2=T
2'+2 DEG C, this temperature is actually determined heating-up temperature, after being heated, is T when temperature after heating measurement mechanism 4 records temperature by heater 3
2reach T
2=T
2when '+2 DEG C, be then suitable heating-up temperature, as the T calculated
2' be 80 DEG C, so suitable heating-up temperature is 82 DEG C, so only needs the temperature of temperature after heating measurement mechanism 4 to control at 82 DEG C, can certainly higher than this temperature.
Claims (4)
1. can determine the method for the suitable heating-up temperature of wet desulphurization smoke evacuation for one kind, the flue (1) that the method device used comprises chimney (6) and communicates with chimney bottom, it is characterized in that described flue (1) setting gradually heating front temperature measuring equipment (2), heater (3), temperature after heating measurement mechanism (4) and flue gas dynamic pressure measurement device (5), described chimney (6) top arranges chimney region dry-bulb temperature measurement mechanism (7) and chimney region wet bulb temperature measuring device (8) from top to bottom, it is characterized in that comprising the steps:
1) clean flue gas after wet desulphurization is entered flue (1), before flowing through the heating in flue (1), temperature measuring equipment (2) records its temperature is T
1, then heat through heater (3), temperature improves, and recording its dynamic pressure by flue gas dynamic pressure measurement device (5) after heating is △ P, then to record temperature through temperature after heating measurement mechanism (4) be T
2, clean flue gas enters chimney (6) again, and up flow out from chimney (6) bottom, discharge chimney (6), recording temperature through chimney region dry-bulb temperature measurement mechanism (7) of chimney (6) is T
3, recording temperature through chimney region wet bulb temperature measuring device (8) is T
4;
2) it is T that the temperature after heating measurement mechanism (4) in step 1) records temperature
2data are relevant with heater (3) heating power, the temperature that this temperature determination flue gas is discharged, and namely for judging whether, gypsum rain occurring, having a theoretical heating-up temperature T when there is not gypsum rain
2', work as T
2>=T
2in ' time, can not gypsum rain be there is, then can according to theoretical heating-up temperature T
2', determine actual required heating-up temperature T
2value;
3) when there is not gypsum rain, theoretical heating-up temperature T
2' meet following formula: T
2'=k × △ P × (T
2'-T
1)/(T
3-T
4), wherein the unit of temperature is DEG C, and the unit of dynamic pressure is Pa, k is coefficient, and k needs to pass through field calibration;
4) k value is substituted in the computing formula of step 3), go out T according to this formulae discovery
2' value, T
2 '+ 2 DEG C are the desired temperature that control does not produce gypsum rain reality;
5) suitable heating-up temperature T
2=T
2'+2 DEG C, this temperature is actually determined heating-up temperature, according to the heating power of this temperature determination heater (3).
2. a kind of method determining the suitable heating-up temperature of wet desulphurization smoke evacuation according to claim 1, before it is characterized in that described heating, temperature measuring equipment (2), temperature after heating measurement mechanism (4) and flue gas dynamic pressure measurement device (5) bottom are arranged on flue (1) medium position.
3. a kind of method determining the suitable heating-up temperature of wet desulphurization smoke evacuation according to claim 1, before it is characterized in that described heating, temperature measuring equipment (2), temperature after heating measurement mechanism (4), chimney region dry-bulb temperature measurement mechanism (7) and chimney region wet bulb temperature measuring device (8) are respectively thermometer.
4. a kind of method determining the suitable heating-up temperature of wet desulphurization smoke evacuation according to claim 1, it is characterized in that the field calibration method of k in step 3): adopt ocular estimate, observe the generation of the outer gypsum rain of chimney, and write down the data T that when there is not gypsum rain, temperature after heating measurement mechanism (4) records
2, make T
2'=T
2, and by this temperature data T
2' and △ P, T of recording
1, T
3, T
4all substitute in the formula of step 3), calculate k value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410050182.3A CN103801187B (en) | 2014-02-13 | 2014-02-13 | A kind of apparatus and method determining the suitable heating-up temperature of wet desulphurization smoke evacuation |
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|---|---|---|---|
| CN201410050182.3A CN103801187B (en) | 2014-02-13 | 2014-02-13 | A kind of apparatus and method determining the suitable heating-up temperature of wet desulphurization smoke evacuation |
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| CN103801187B true CN103801187B (en) | 2015-11-25 |
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| CN106925083A (en) * | 2015-12-29 | 2017-07-07 | 天津市英派克石化工程有限公司 | A kind of improved wet desulfurizing process |
| CN109012068A (en) * | 2018-10-17 | 2018-12-18 | 上海外高桥第二发电有限责任公司 | It is a kind of for administering the Emission Optimization method of white plume |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007726A (en) * | 2011-09-23 | 2013-04-03 | 沈阳铝镁设计研究院有限公司 | Device for preventing wet desulfurization outlet flue from low-temperature corrosion and control method thereof |
| CN203790823U (en) * | 2014-02-13 | 2014-08-27 | 浙江浙能温州发电有限公司 | Device for determining proper heating temperature of smoke discharged during wet desulphurization |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007726A (en) * | 2011-09-23 | 2013-04-03 | 沈阳铝镁设计研究院有限公司 | Device for preventing wet desulfurization outlet flue from low-temperature corrosion and control method thereof |
| CN203790823U (en) * | 2014-02-13 | 2014-08-27 | 浙江浙能温州发电有限公司 | Device for determining proper heating temperature of smoke discharged during wet desulphurization |
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| CN103801187A (en) | 2014-05-21 |
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