CN103007726B - Prevent device and the control method of wet desulfurization outlet flue from low-temperature corrosion - Google Patents
Prevent device and the control method of wet desulfurization outlet flue from low-temperature corrosion Download PDFInfo
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- CN103007726B CN103007726B CN201110284483.9A CN201110284483A CN103007726B CN 103007726 B CN103007726 B CN 103007726B CN 201110284483 A CN201110284483 A CN 201110284483A CN 103007726 B CN103007726 B CN 103007726B
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Abstract
The present invention relates to a kind of wet desulphurization exhaust pass, particularly relate to a kind of device and the control method that prevent wet desulfurization outlet flue from low-temperature corrosion.Prevent the device of wet desulfurization outlet flue from low-temperature corrosion, comprise wet desulphurization exhaust pass, wet desulphurization exhaust pass is provided with flue gas analyzer and temperature measuring instrument, wet desulphurization exhaust pass is connected with high-temperature flue by high temperature air pipeline, high-temperature flue is provided with heat exchanger, high temperature air pipeline is connected with heat exchanger one end, and the other end of heat exchanger is connected with air duct.Advantageous effect of the present invention: flue gas in flue temperature can be ensured all the time higher than the dew-point temperature of acid, avoid the cold end corrosion of flue.
Description
Technical field
The present invention relates to one
the device of flue cold end corrosion, particularly relates to oneprevent device and the control method of wet desulfurization outlet flue from low-temperature corrosion.
Background technology
Wet process of FGD is the slurry wash flue gas utilizing spray, is removed by the eroded elements in flue gas in absorption tower.The efficiency of wet process of FGD usually more than 90%, but still contains small part SO in exiting flue gas
3and SO
2, and H in flue gas
2the content of O is high, and flue gas acid dew point temperature is improved.In actual motion, often cause cold end corrosion to pipeline, impact is produced normally, increases operating cost, and there is certain potential safety hazard.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of device and the control method that prevent wet desulfurization outlet flue from low-temperature corrosion, the flue-gas temperature after object makes desulfurization remains in flue gas on acid dew point, to reduce the cold end corrosion of flue.
The present invention prevents the device of wet desulfurization outlet flue from low-temperature corrosion to achieve these goals, comprise wet desulphurization exhaust pass, wet desulphurization exhaust pass is provided with flue gas analyzer and temperature measuring instrument, wet desulphurization exhaust pass is connected with high-temperature flue by high temperature air pipeline, high-temperature flue is provided with heat exchanger, high temperature air pipeline is connected with heat exchanger one end, and the other end of heat exchanger is connected with air duct.
Described high temperature air pipeline is provided with motor-driven valve.
High temperature air pipeline between described motor-driven valve and heat exchanger is provided with temperature measuring instrument.
Prevent the control method of wet desulfurization outlet flue from low-temperature corrosion device, record smoke components according to flue gas analyzer, calculate flue gas acid dew point temperature, with
represent, setting low spot control temperature and the low point control temperature difference, respectively with
with
represent; Set high point control temperature and the high point control temperature difference, respectively with
with
represent, the pass between them is:
When flue gas actual temperature
time, motor-driven valve is opened automatically, in flue, send into high temperature air;
When flue gas actual temperature
time, motor-driven valve cuts out automatically, stops sending high temperature air to flue.
Advantageous effect of the present invention: flue gas in flue temperature can be ensured all the time higher than the dew-point temperature of acid, avoid the cold end corrosion of flue.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, flue gas analyzer; 2, temperature measuring instrument; 3, motor-driven valve; 4, heat exchanger; 5, high-temperature flue; 6, wet desulphurization exhaust pass; 7, high temperature air pipeline; 8, air duct.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
The present invention prevents the device of wet desulfurization outlet flue from low-temperature corrosion as shown in the figure, comprise wet desulphurization exhaust pass 6, wet desulphurization exhaust pass 6 is provided with flue gas analyzer 1 and temperature measuring instrument 2, wet desulphurization exhaust pass 6 is connected with high-temperature flue 5 by high temperature air pipeline 7, high-temperature flue 5 is provided with heat exchanger 4, high temperature air pipeline 7 is connected with heat exchanger 4 one end, the other end of heat exchanger 4 is connected with air duct 8, high temperature air pipeline 7 is provided with motor-driven valve 3, and the high temperature air pipeline 7 between motor-driven valve 3 and heat exchanger 4 is provided with temperature measuring instrument 2.
Prevent the control method of wet desulfurization outlet flue from low-temperature corrosion device, record smoke components according to flue gas analyzer, calculate flue gas acid dew point temperature, with
represent, setting low spot control temperature and the low point control temperature difference, respectively with
with
represent; Set high point control temperature and the high point control temperature difference, respectively with
with
represent, the pass between them is:
When flue gas actual temperature
time, motor-driven valve is opened automatically, in flue, send into high temperature air;
When flue gas actual temperature
time, motor-driven valve cuts out automatically, stops sending high temperature air to flue.
1, the setting of control temperature
Utilize flue gas analyzer, record each component volume percentage in flue gas
, for grassroot project, during design, this numerical value can be determined according to data.
The determination of acid dew-point temperature
(1)
In formula
,
for in flue gas
with
dividing potential drop, unit is Pa
-flue gas pressures, Pa
in-flue gas
volume fraction, %
in-flue gas
volume fraction, %
in-flue gas
volume fraction, %
-
be converted into
transformation ratio, change between 2% ~ 10% according to its numerical value of different situations
The setup control temperature difference according to the actual requirements
,
, therefore high and low control temperature is respectively:
(2)
(3)
By high and low control temperature and motor-driven valve chain, utilize temperature element to measure flue gas actual temperature
, when
time, motor-driven valve is opened automatically, in flue, send into high temperature air; When
time, motor-driven valve cuts out automatically, stops sending high temperature air to flue, to realize the automatic control of low-temperature flue gas temperature.
2, the determination of high temperature air amount
By flue-gas temperature by
rise to
required heat is:
(4)
In formula:
for flue gas specific heat,
dEG C;
for flue gas volume flow, unit
.
x composition specific heat at the working temperature in-gas,
dEG C
By flue-gas temperature by
rise to
required heat, provided by high temperature air, therefore, high temperature air amount is:
(5)
In formula:
for air specific heat, unit
dEG C;
for high temperature air design temperature, unit DEG C.
According to parameters such as high temperature air flow, temperature, determine the material specification of conveyance conduit and the model of electrically operated valve.According to formula (3) and formula (5) and Practical Project condition, setting
with
value, derives from blower fan or formula compressed air to select high temperature air.
3, the determination of heat exchanger heat exchange amount
Be blower fan according to high temperature air amount selection air source of the gas or be low-pressure compressed air, the heat exchanger of air through being arranged in high-temperature flue, forms high temperature air, as the thermal source of heating low-temperature flue gas.By air by environment temperature
rise to design temperature
required heat is
(6)
According to the performance parameter of high-temperature flue gas and the parameter such as flow, temperature of high temperature air, determine that heat exchanger is correlated with the performance parameter such as model, material.
Claims (1)
1. prevent the control method of wet desulfurization outlet flue from low-temperature corrosion device, it is characterized in that recording smoke components according to flue gas analyzer, calculate flue gas acid dew point temperature, with
represent, setting low spot control temperature and the low point control temperature difference, respectively with
with
represent; Set high point control temperature and the high point control temperature difference, respectively with
with
represent, the pass between them is:
When flue gas actual temperature
time, motor-driven valve is opened automatically, in flue, send into high temperature air;
When flue gas actual temperature
time, motor-driven valve cuts out automatically, stops sending high temperature air to flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110284483.9A CN103007726B (en) | 2011-09-23 | 2011-09-23 | Prevent device and the control method of wet desulfurization outlet flue from low-temperature corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110284483.9A CN103007726B (en) | 2011-09-23 | 2011-09-23 | Prevent device and the control method of wet desulfurization outlet flue from low-temperature corrosion |
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| Publication Number | Publication Date |
|---|---|
| CN103007726A CN103007726A (en) | 2013-04-03 |
| CN103007726B true CN103007726B (en) | 2015-08-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103801187B (en) * | 2014-02-13 | 2015-11-25 | 浙江浙能温州发电有限公司 | A kind of apparatus and method determining the suitable heating-up temperature of wet desulphurization smoke evacuation |
| CN109647123A (en) * | 2017-10-11 | 2019-04-19 | 中冶长天国际工程有限责任公司 | Sintering flue gas temprature control method and device for sintering smoke purifying system |
| CN113209790B (en) * | 2021-05-28 | 2022-12-06 | 沈阳东大山汇环境科技有限公司 | Treatment system and method for preventing corrosion and scaling of equipment acid dew in flue gas treatment process |
| CN113883544A (en) * | 2021-09-30 | 2022-01-04 | 中国石油大学(华东) | Sulfur-containing flue gas waste heat recovery device and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201500510U (en) * | 2009-09-17 | 2010-06-09 | 西安热工研究院有限公司 | Low-temperature flue gas heating system used after wet flue gas desulfurization |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58184422A (en) * | 1982-04-23 | 1983-10-27 | Babcock Hitachi Kk | Treating device for exhaust gas |
| JP3200608B2 (en) * | 1997-11-28 | 2001-08-20 | バブコック日立株式会社 | Exhaust gas treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201500510U (en) * | 2009-09-17 | 2010-06-09 | 西安热工研究院有限公司 | Low-temperature flue gas heating system used after wet flue gas desulfurization |
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