CN102519129A - Chemical pool water heating system by aid of flue gas waste heat recovery and method - Google Patents
Chemical pool water heating system by aid of flue gas waste heat recovery and method Download PDFInfo
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- CN102519129A CN102519129A CN2011104210217A CN201110421021A CN102519129A CN 102519129 A CN102519129 A CN 102519129A CN 2011104210217 A CN2011104210217 A CN 2011104210217A CN 201110421021 A CN201110421021 A CN 201110421021A CN 102519129 A CN102519129 A CN 102519129A
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Abstract
Disclosed are a chemical pool water heating system by the aid of flue gas waste heat recovery and a method. A heat exchanger is arranged on a flue of an outlet of a dust catcher, and water in a chemical pool is delivered to the heat exchanger via a water pump (the water pump is provided with a frequency converter), and flows back into the water pool after being heated. Temperature signals are fed back to the frequency converter by a thermocouple arranged in the pool, the frequency converter can adjust the flow of the water pump according to temperature, and furthermore, the temperature of the water is controlled within a constant range (from 20 DEG C to 30 DEG C). The chemical pool water heating system has an important significance for improving a flocculating effect of the water, and finally, the quality of manufactured water is improved. By the aid of the method, a part of waste heat in flue gas is recovered on the premise of increasing a little resistance (lower than 50Pa) on the flue gas, a flocculating effect of a chemical clarifier is improved, and accordingly, the quality of chemically manufactured water is guaranteed. In addition, with regard to an induced draft fan, the density of the flue gas is increased, the volume of the flue gas is reduced, accordingly, exerted force of the induced draft fan is decreased, and a certain effect of improving desulphurization efficiency is realized after the temperature of the flue gas is reduced.
Description
Technical field
The invention belongs to the energy-saving and emission-reduction field, be specifically related to a kind of UTILIZATION OF VESIDUAL HEAT IN of rationally carrying out, the system and method for chemical tank water is heated in the flue gas waste heat recovery that chemical clarification pond temperature is improved.
Background technology
In the large thermal power plant, especially north cold area often because chemical water temperature is on the low side, causes the chemical water flocculating effect not good, causes water quality defective, and system water rate descends significantly; Perhaps in order to reach requirement, comparing other regional unit water producing cost of the same type increases greatly.
At north cold area, its temperature is extremely low, even has reached about-30 ℃, and chemical clarification pond water temperature requirements is 20-30 ℃ of the best.So extremely low temperature condition is totally unfavorable to chemistry system water condition.A lot of power plant be often because chemical water temperature can not meet the demands, and cause the boiler feed water quality to descend or defective, make heat-transfer effect variation or equipment caused corrosion when causing steam to get into pipeline or steam turbine.Power plant often utilizes high-quality steam source to heat this part water quality in order to address this problem, and this has increased power plant's operating cost, causes coal consumption higher.
For coal-fired unit, the flue-gas temperature behind the deduster is about 120 ℃, and heat is huge.The part heat is rationally utilized, heat chemical tank water, the economy of full factory is had very important meaning.
Summary of the invention
The object of the present invention is to provide and a kind ofly can improve the chemical clarification sump water temperature through waste heat recovery, thereby reach flocculating effect preferably, the system and method for chemical tank water is heated in the flue gas waste heat recovery that further improves chemistry system quality.
For achieving the above object; System of the present invention comprises: in boiler flue deduster exhaust pass, heat exchanger is installed; This heat exchanger forms closed circulation with the pond by the road; The water pump of band frequency converter is installed on the pipeline of pond outlet, in the pond, also is provided with the thermocouple that water temperature signal is fed back to frequency converter.
Method of the present invention is following:
1) at first, in the deduster rear pass, arrange heat exchanger, the water in the chemical pond gets into heat exchanger through water pump water is heated, and the current after the heating are got back to the pond;
2) thermocouple that is arranged in the pond feeds back to the frequency converter of water pump with the temperature signal of water, by the flow of Frequency Converter Control water pump.
The present invention arranges a heat exchanger on the flue of deduster outlet, the water in the chemical pond is delivered to this heat exchanger through water pump (this pump is furnished with frequency converter), flows back to the pond after the heating.The Thermocouple Temperature Signal that is arranged in the pond is fed back to frequency converter, and frequency converter can just carry out the adjusting of pump capacity according to temperature, further controls water temperature (20～30 ℃) in constant scope.This has important effect to the flocculating effect that improves water, and the final system water quality that makes is improved.
The method (less than 50Pa) under the prerequisite that increases the little smoke atmidometer has reclaimed part of waste heat in the flue gas, has improved the flocculating effect in chemical clarification pond, thereby has guaranteed the quality of chemical system water; In addition, the air-introduced machine for the heat exchanger rear end has improved smoke density, has reduced flue gas volume, thereby has reduced exerting oneself of air-introduced machine; Raising to desulfuration efficiency after flue-gas temperature reduces also has certain effect.
Heat exchanger form of the present invention is decided according to flue gas flow, flue-gas temperature, discharge, coolant-temperature gage; The water pump form is decided according to discharge, coolant-temperature gage.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Referring to Fig. 1, the present invention includes the heat exchanger 1 that is arranged in the boiler flue deduster exhaust pass, and the water pump 2 that links to each other with heat exchanger 1; Water pump 2 water come from pond 4; In order to adjust water temperature, in pond 4, be furnished with thermocouple 3, wherein thermocouple 3 links to each other with frequency converter in the water pump.The flue gas trend also is furnished with air-introduced machine, desulfurizing tower and chimney in the heat exchanger rear end.
The course of work of the present invention is:
1) at first, on desulfurization exhanst gas outlet horizontal flue, arrange a heat exchanger 1, water temperature and chemical water consumption that the form structure of heat exchanger 1 etc. are kept according to exhaust gas volumn, flue-gas temperature, pond 4 needs are confirmed;
2) water pump 2 is sent into the water in the pond 4 in the heat exchanger 1 and is heated, and the water after the heating continues to flow in the pond 4;
3) regulate for the ease of the water temperature in the pond 4, in pond 4, arrange a thermocouple 3, thermocouple 3 is connected with frequency converter, can temperature signal be fed back to frequency converter,, thus the control pump capacity, and then water temperature in the control pond 4.
The invention has the advantages that:
1, using in north cold area thermal power plant should technology, can keep chemical sump water temperature to maintain 25-30 ℃, reaches best flocculating effect, guarantees chemistry system water quality, reaches energy-saving and cost-reducing purpose;
2, heat exchanger is arranged in the deduster exhaust pass, because flue-gas temperature higher (110-140 ℃), because heat exchanger area is very little, flue gas resistance increases less than 50Pa, and is little to the SR influence;
3, heat exchanger can effectively reduce flue-gas temperature, thereby can reduce flue gas volume, increases smoke density, and this helps to reduce the power consumption of blower fan.Raising to desulfuration efficiency after flue-gas temperature reduces also has certain effect.
Claims (2)
1. the system of chemical tank water is heated in a flue gas waste heat recovery; It is characterized in that: heat exchanger (1) is installed in boiler flue deduster exhaust pass; This heat exchanger (1) forms closed circulation with pond (4) by the road; The water pump (2) of band frequency converter is installed on the pipeline of pond (4) outlet, in pond (4), also is provided with the thermocouple (3) that water temperature signal is fed back to frequency converter.
2. the method for the system of chemical tank water is heated in a flue gas waste heat recovery as claimed in claim 1, it is characterized in that:
1) at first, in the deduster rear pass, arrange heat exchanger (1), the water in chemical pond (4) gets into heat exchanger (1) to the water heating through water pump (2), and the current after the heating are got back to the pond;
2) thermocouple (3) that is arranged in the pond (4) feeds back to the frequency converter of water pump (2) with the temperature signal of water, by the flow of Frequency Converter Control water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104210217A CN102519129A (en) | 2011-12-14 | 2011-12-14 | Chemical pool water heating system by aid of flue gas waste heat recovery and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104210217A CN102519129A (en) | 2011-12-14 | 2011-12-14 | Chemical pool water heating system by aid of flue gas waste heat recovery and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102519129A true CN102519129A (en) | 2012-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011104210217A Pending CN102519129A (en) | 2011-12-14 | 2011-12-14 | Chemical pool water heating system by aid of flue gas waste heat recovery and method |
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| CN (1) | CN102519129A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423183A (en) * | 2013-07-15 | 2013-12-04 | 上海申能能源科技有限公司 | Thermal power plant fan optimal configuration system and thermal power plant fan optimal configuration method |
| CN104913503A (en) * | 2015-06-23 | 2015-09-16 | 丹东蓝天环保锅炉制造有限公司 | Deep waste heat recycle device of boiler |
| CN114484921A (en) * | 2022-01-19 | 2022-05-13 | 西安交通大学 | Coupling absorption heat pump cascade utilization waste heat distributed energy supply system and operation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2502228Y (en) * | 2001-08-24 | 2002-07-24 | 广州市达德技术发展有限公司 | Hot water energy-saving device using waste heat automatic controlled by computer |
| JP2002340439A (en) * | 2001-05-17 | 2002-11-27 | Denso Corp | Heat pump type hot-water supplier |
| CN1892147A (en) * | 2005-07-05 | 2007-01-10 | 新疆新能源股份有限公司 | Direct-flow type solar water-heating system and its water-flow control method |
| CN101520172A (en) * | 2009-04-03 | 2009-09-02 | 上海晟煜科贸有限公司 | Energy-saving reclaiming process for residual heat of fume in boiler |
-
2011
- 2011-12-14 CN CN2011104210217A patent/CN102519129A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002340439A (en) * | 2001-05-17 | 2002-11-27 | Denso Corp | Heat pump type hot-water supplier |
| CN2502228Y (en) * | 2001-08-24 | 2002-07-24 | 广州市达德技术发展有限公司 | Hot water energy-saving device using waste heat automatic controlled by computer |
| CN1892147A (en) * | 2005-07-05 | 2007-01-10 | 新疆新能源股份有限公司 | Direct-flow type solar water-heating system and its water-flow control method |
| CN101520172A (en) * | 2009-04-03 | 2009-09-02 | 上海晟煜科贸有限公司 | Energy-saving reclaiming process for residual heat of fume in boiler |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423183A (en) * | 2013-07-15 | 2013-12-04 | 上海申能能源科技有限公司 | Thermal power plant fan optimal configuration system and thermal power plant fan optimal configuration method |
| CN104913503A (en) * | 2015-06-23 | 2015-09-16 | 丹东蓝天环保锅炉制造有限公司 | Deep waste heat recycle device of boiler |
| CN104913503B (en) * | 2015-06-23 | 2018-03-06 | 丹东蓝天环保锅炉制造有限公司 | Boiler afterheat depth retracting device |
| CN114484921A (en) * | 2022-01-19 | 2022-05-13 | 西安交通大学 | Coupling absorption heat pump cascade utilization waste heat distributed energy supply system and operation method |
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Application publication date: 20120627 |