CN1995823A - Flue gas heater by evaporative cooling - Google Patents
Flue gas heater by evaporative cooling Download PDFInfo
- Publication number
- CN1995823A CN1995823A CN 200610169891 CN200610169891A CN1995823A CN 1995823 A CN1995823 A CN 1995823A CN 200610169891 CN200610169891 CN 200610169891 CN 200610169891 A CN200610169891 A CN 200610169891A CN 1995823 A CN1995823 A CN 1995823A
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- flue gas
- heat exchange
- heat exchanger
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to an evaporation and cooling gas heater, comprising original smoke heat exchanger (1) and purified smoke heat exchanger (2), steam dome (3), by which two heat exchangers are connected. At the side of original smoke heat exchanger (1), the quantity of heat of original smoke is transferred to the cycling medium (11) in heat exchanging pipe (6) at original smoke side. The cycling medium (11) is evaporated by heating and formed steam enters in heat exchanging pipe (7) at purified smoke side. In the heat exchanging pipe (7), the quantity of heat of steam is transferred to the purified smoke and the purified smoke is condensed into liquid. Under the effect of gravity, liquid medium returns into the heat exchanging pipe (6) at the original smoke side through steam dome (3). By the cycling, the purpose that the quantity of heat of original is used to heat the purified smoke is realized. Steam even-pressure room (5) at the purified smoke side is connected with vacuum pump (10) outside so as to control the pressure in evaporating and cooling system and the boiling point of cycling medium. The invention can adopt multiple groups of smoke heater in parallel. By controlling the pressure in each heat exchanger, multi-step temperature difference heat exchanger is realized. The invention is provided with no leakage of smoke, strong applicable ability to load variety of mainframe, and no operation consumption.
Description
Technical field
The present invention relates to a kind of flue gas heater that is used for the heat-engine plant wet desulfuration field, particularly flue gas heater by evaporative cooling.
Background technology
Normally used flue gas heater (GGH) has two kinds, swinging GGH and hydrophily formula GGH in this field at present.The system of swinging GGH is strong to the adaptive capacity of flue gas, have characteristics such as layout is more convenient, the use achievement is more, but because the former flue gas flue of swinging GGH and clean flue gas flue are interconnected, there be the leakage problem of former flue gas, can cause the reduction of desulfuration efficiency like this to clean flue gas.The auxiliary equipment of swinging GGH operation is many in addition, control system is complicated, and it is big generally to have energy consumption, operation and shortcoming difficult in maintenance.Hydrophily formula GGH does not have the smoke spillage problem, but the energy consumption of big, the high-lift water pump of circulating water flow is still very big.
Summary of the invention
The objective of the invention is to overcome the GGH smoke spillage and the big shortcoming of energy consumption of prior art, propose a kind of safe, efficient, controlled economical flue gas heater that adopts vapor cooling system, the present invention can realize not having the energy consumption operation.
The present invention mainly comprises former flue gas heat exchange device, clean flue gas heat exchange device and steam chest three parts, is provided with steam chest between two former flue gas flues that are arranged in parallel and the clean flue gas flue, and former flue gas heat exchange device directly links to each other by steam chest with clean flue gas heat exchange device.Liquid medium in the heat exchanger tube of former flue gas heat exchange device absorbs the heat of former flue gas and evaporates, medium steam enters in the heat exchanger tube of clean flue gas heat exchange device through steam chest, steam is condensed into liquid state by heat exchanger tube with the clean flue gas of heat transferred, is flowed back to by the effect of gravity in the heat exchanger tube of former flue gas heat exchange device.By the evaporation of medium and the circulation of condensation, realized the clean flue gas of the heat transferred of former flue gas, reach purpose to former flue gas cool-down and clean flue gas intensification.
The present invention adopts the control of the method for temperature realization of medium in the control heat exchanger tube to flue-gas temperature.Because the medium in the heat exchanger tube is to carry out exchange heat by the mode of phase transformation, the boiling point of medium changes with the variation of pressure, as long as the pressure that changes the circulatory system just can change the boiling point of medium, and the temperature in the heat exchanger tube promptly is the boiling temperature of medium, therefore can realize the boiling point of medium in managing is controlled by the pressure in the control heat exchanger tube, thereby realize managing interior temperature controlling.In order to control evaporation and condensation cycle system internal pressure, a vavuum pump is equipped with in the present invention, is connected with the circulatory system.Under the pressure of setting, inner evaporation and condensation reach after the balance, and when promptly evaporation capacity equaled condensation number, the pressure of the circulatory system can not change, and was stabilized in setting value always.When needing to change this setting value, open vavuum pump and adjust pressure.
Medium in the flue gas heater carries out heat exchange by phase transformation under certain pressure and corresponding boiling temperature, actual needs according to engineering, the present invention can adopt the mode of many group flue gas heaters series connection to realize multistage temperature difference heat exchange by the pressure of controlling circulatory mediator in each flue gas heater, can improve the heat exchange efficiency of flue gas heater integral body so effectively.
Description of drawings
Fig. 1 is a theory structure schematic diagram of the present invention.Among the figure: 1 former flue gas heat exchange device, 2 clean flue gas heat exchange devices, 3 steam chests, 4 liquid all press chamber, 5 steam all to press chamber, 6 former fume side heat exchanger tubes, 7 clean fume side heat exchanger tubes, 8 tapping valves, 9 exhaust steam valves, 10 vavuum pumps, 11 media, 12 pressure sensors;
Fig. 2 is the structural representation of two-stage heat exchanger series connection.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the present invention mainly comprises former flue gas heat exchange device 1, clean flue gas heat exchange device 2 and steam chest 3 three parts, and steam chest 3 is arranged between two former flue gas flues that are arranged in parallel and the clean flue gas flue.Former flue gas heat exchange device 1 is positioned at the top of clean flue gas heat exchange device 2.Former flue gas heat exchange device 1 directly links to each other by steam chest 3 with clean flue gas heat exchange device 2.Evaporative cooling medium 11 is a distilled water, has colourless, tasteless, nontoxic, characteristics such as do not burn.Medium 11 form with liquid state in former fume side heat exchanger tube 6 exists, form with steam in clean fume side heat exchanger tube 7 exists, the heat of vaporization that liquid medium 11 in the former fume side heat exchanger tube 6 absorbs former flue gas forms steam, steam directly enters into clean fume side heat exchanger tube 7 through steam chest 3 under the effect of buoyancy lift, steam in the clean fume side heat exchanger tube 7 condenses into liquid with the clean flue gas of heat transferred, liquid medium 11 flows back to former fume side heat exchanger tube 6 through steam chest 3 under the effect of gravity, reached the purpose with the clean flue gas of heat transferred of former flue gas in the cyclic process of this medium evaporation-condensation.
Former flue gas flue is positioned at the below of clean flue gas flue, and the former flue gas heat exchange device 1 of former flue gas through the lower end that comes out from burner hearth flows through, and the former flue gas after former flue gas heat exchange device 1 cooling directly enters desulfurizing tower.The clean flue gas heat exchange device 2 of clean flue gas through the upper end that comes out from desulfurizing tower flows through, and directly enters chimney after clean flue gas heats up and discharge in clean flue gas heat exchange device 2.The flow direction at flue gas heater Central Plains flue gas and clean flue gas is opposite.Two flues of the present invention are separate, fundamentally solved the problem of smoke spillage.The sour corrosion degree difference of flue gas heater both sides flue, therefore two flues can be selected different manufactured materials for use according to corresponding corrosion resistant requirement.
The upper end of former fume side heat exchanger tube 6 is communicated with steam chest 3, and the lower end all presses chamber 4 to be connected with liquid.All press the bottom of chamber 4 that tapping valve 8 is set at liquid, medium 11 injects or the discharge heat exchanger through tapping valve 8.The lower end of clean fume side heat exchanger tube 7 is communicated with steam chest 3, and the upper end all presses chamber 5 to be connected with steam.All press the upper end of chamber 5 to connect exhaust steam valve 9 at steam, the other end of exhaust steam valve 9 is connected with vavuum pump 10, air in the circulatory system of evaporative cooling medium and unnecessary steam are discharged by vavuum pump 10 through exhaust steam valve 9, under the pressure of setting, inner evaporation and condensation reach after the balance, be evaporation capacity when equaling condensation number, the pressure of the circulatory system can not change, and is stabilized in setting value always.When needs change this setting value, open vavuum pump and adjust pressure.
The present invention is controlled at the heat exchange temperature of setting by pressure controlled mode with the temperature of heat exchanger tube, utilizes phase-change heat-exchange not only to improve heat exchange efficiency widely, and has improved the controllability of whole heat-exchange system.
Former fume side heat exchanger tube 6 and clean fume side heat exchanger tube 7 can adopt light pipe according to the actual needs of engineering, also can adopt finned tube.The evaporative cooling circulatory mediator flows in heat exchanger tube, and flue gas flows through outside pipe.
Tapping valve 8 and exhaust steam valve 9 can adopt manual control valve, also can adopt autocontrol valve.For the automaticity that improves flue gas heater can adopt central controlled mode to be linked in the automatic control system in tapping valve 8, exhaust steam valve 9 and vavuum pump 10.
For example:, in the time the temperature of heat exchanger tube need being controlled at 80 ℃, just the pressure in the circulatory system need be controlled at 0.047MPa for the situation of one-level flue gas heater; In the time need adjusting to 60 ℃ to the temperature of heat exchanger tube, just the pressure of the circulatory system need be adjusted to 0.02MPa.
Fig. 2 is the structure chart of two-stage flue gas heater series connection.According to the actual needs of engineering, can adopt the mode of many group flue gas heaters series connection, realize multistage temperature difference heat exchange by the pressure of controlling medium in each flue gas heater.In two-stage flue gas heater when series connection,, when the distilled water of employing during as circulatory mediator, the temperature that needs the heat exchanger tube of the first order is 80 ℃, so the circulatory system pressure of the first order should be controlled at 0.047MPa for the present invention; The temperature that needs second level heat exchanger tube is 60 ℃, so the pressure of the second level circulatory system just should be controlled at 0.02MPa, can improve the heat exchange efficiency of flue gas heater integral body so effectively.
Claims (4)
1, a kind of flue gas heater by evaporative cooling is characterized in that this flue gas heater comprises clean flue gas heat exchange device (2) of former flue gas heat exchange device (1) and steam chest (3) three parts, and steam chest (3) is arranged between two former flue gas flues that are arranged in parallel and the clean flue gas flue; Former flue gas heat exchange device (1) is positioned at the top of clean flue gas heat exchange device (2), and former flue gas heat exchange device (1) directly is connected by steam chest (3) with clean flue gas heat exchange device (2); The upper end of former fume side heat exchanger tube (6) is communicated with steam chest (3), and the lower end all presses chamber (4) to be connected with liquid; All press the bottom of chamber (4) that tapping valve (8) is set at liquid, medium (11) injects through tapping valve (8) or the discharge heat exchanger; The lower end of clean fume side heat exchanger tube (7) is communicated with steam chest (3), and the upper end all presses chamber (5) to be connected with steam; All press the upper end of chamber (5) to connect exhaust steam valve (9) at steam, the other end of exhaust steam valve (9) is connected with vavuum pump (10), and air in the circulatory system of evaporative cooling medium and unnecessary steam are discharged by vavuum pump (10) through exhaust steam valve (9).
2, flue gas heater by evaporative cooling according to claim 1, it is characterized in that former flue gas flue is positioned at the below of clean flue gas flue, the flow through former flue gas heat exchange device (1) of lower end of the former flue gas that comes out from burner hearth, the former flue gas after former flue gas heat exchange device (1) cooling directly enters desulfurizing tower; The flow through clean flue gas heat exchange device (2) of upper end of the clean flue gas that comes out from desulfurizing tower, clean flue gas directly enters the chimney discharge after heating up in clean flue gas heat exchange device (2); The flow direction at flue gas heater Central Plains flue gas and clean flue gas is opposite.
3, flue gas heater by evaporative cooling according to claim 1 is characterized in that former fume side heat exchanger tube (6) and clean fume side heat exchanger tube (7) adopt light pipe or finned tube, and evaporative cooling circulatory mediator (11) flows in heat exchanger tube.
4, flue gas heater by evaporative cooling according to claim 1 is characterized in that the series connection of available many group heaters realizes multistage temperature difference heat exchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101698919A CN100572920C (en) | 2006-12-30 | 2006-12-30 | Flue gas heater by evaporative cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101698919A CN100572920C (en) | 2006-12-30 | 2006-12-30 | Flue gas heater by evaporative cooling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1995823A true CN1995823A (en) | 2007-07-11 |
| CN100572920C CN100572920C (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101698919A Expired - Fee Related CN100572920C (en) | 2006-12-30 | 2006-12-30 | Flue gas heater by evaporative cooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100572920C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188888A (en) * | 2011-04-12 | 2011-09-21 | 王晓晔 | A wet method treatment process of purified flue gas with a water collection function in the process and a processing apparatus thereof |
| CN102230635A (en) * | 2011-05-11 | 2011-11-02 | 北京世能中晶能源科技有限公司 | Treatment system and method of smoke |
| CN102305562A (en) * | 2011-09-08 | 2012-01-04 | 北京京诚科林环保科技有限公司 | Integral heat pipe smoke temperature regulator |
| WO2014048089A1 (en) * | 2012-09-26 | 2014-04-03 | 上海伏波环保设备有限公司 | Natural circulation indirect type flue gas reheater |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1136946C (en) * | 1999-07-27 | 2004-02-04 | 陈然振 | Flue gas desulfurization technology and equipment by using lime/gypsum method |
| CN2773597Y (en) * | 2005-02-21 | 2006-04-19 | 南京圣诺热管有限公司 | Integrated hot-pipe gas-gas heat exchanger for desulfurizing smoke |
| CN2823956Y (en) * | 2005-09-05 | 2006-10-04 | 上海发电设备成套设计研究所 | Vapour-smoke heater for smoke desulfurizing |
| CN1818472A (en) * | 2006-01-10 | 2006-08-16 | 孙克勤 | Separated smoke re-heater and heat-exchanging method |
-
2006
- 2006-12-30 CN CNB2006101698919A patent/CN100572920C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188888A (en) * | 2011-04-12 | 2011-09-21 | 王晓晔 | A wet method treatment process of purified flue gas with a water collection function in the process and a processing apparatus thereof |
| CN102230635A (en) * | 2011-05-11 | 2011-11-02 | 北京世能中晶能源科技有限公司 | Treatment system and method of smoke |
| CN102230635B (en) * | 2011-05-11 | 2013-06-05 | 北京世能中晶能源科技有限公司 | Treatment system and method of smoke |
| CN102305562A (en) * | 2011-09-08 | 2012-01-04 | 北京京诚科林环保科技有限公司 | Integral heat pipe smoke temperature regulator |
| WO2014048089A1 (en) * | 2012-09-26 | 2014-04-03 | 上海伏波环保设备有限公司 | Natural circulation indirect type flue gas reheater |
| KR20150052300A (en) | 2012-09-26 | 2015-05-13 | 상하이 푸보 이피 이큅프먼트 컴퍼니 리미티드 | Natural circulation indirect type flue gas reheater |
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| Publication number | Publication date |
|---|---|
| CN100572920C (en) | 2009-12-23 |
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Granted publication date: 20091223 Termination date: 20181230 |