CN204285497U - A kind of recirculation closed loop system for flue gas waste heat recovery - Google Patents
A kind of recirculation closed loop system for flue gas waste heat recovery Download PDFInfo
- Publication number
- CN204285497U CN204285497U CN201420749065.1U CN201420749065U CN204285497U CN 204285497 U CN204285497 U CN 204285497U CN 201420749065 U CN201420749065 U CN 201420749065U CN 204285497 U CN204285497 U CN 204285497U
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- Prior art keywords
- recirculation
- cold
- pipeline
- junction
- control valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The utility model relates to a kind of recirculation closed loop system for flue gas waste heat recovery, comprises gas cooler, cold dielectric heater and control device; Gas cooler cold junction is connected with cold dielectric heater cold junction by SAPMAC method pipeline, and its hot junction is connected with cold dielectric heater hot junction by thermal cycle pipeline, and its gas approach end is connected with smoke intake pipeline, and its smoke outlet is connected with smoke discharging pipe; Recirculation conduit is in parallel with cold dielectric heater, and recirculation conduit outlet is connected with SAPMAC method pipeline, and recirculation conduit entrance is connected with thermal cycle pipeline; Recirculation conduit is provided with recirculation control valve; SAPMAC method pipeline between recirculation conduit outlet and cold dielectric heater cold junction is provided with main flow control valve; SAPMAC method pipeline between recirculation conduit outlet and the cold junction of gas cooler is provided with frequency variable circulating pump; Recirculation control valve, main flow control valve are connected with control device respectively with frequency variable circulating pump.
Description
Technical field
The utility model relates to a kind of recirculation closed loop system, particularly relates to a kind of recirculation closed loop system for flue gas waste heat recovery.
Technical background
General boiler tail afterbody heating surface is air preheater.For ensureing that air preheater cold-end air wall temperature cold end corrosion does not occur higher than flue gas dew point, generally get higher exhaust gas temperature.Heat loss due to exhaust gas account for the overwhelming majority of boiler heat loss, in order to energy-saving and cost-reducing, emissions reduction, needs to make full use of smoke discharging residual heat.
Number of patent application is 201320639678.5 disclose a kind of preheating air by flue gas afterheat system for field of thermal power, by independent loops Water Sproading smoke discharging residual heat, for heating air preheater import cold wind.But when boiler ature of coal changes, the cigarette wind ratio of boiler and flue gas dew point can corresponding changes, and the change of boiler smoke wind ratio can change the inlet water temperature of this system back-end ductwork convection heating surface, thus changes its wall temperature.The reduction of wall temperature or the rising of flue gas dew point, all can cause back-end ductwork convection heating surface generation cold end corrosion.Therefore, this system can not meet the safe operation of back-end ductwork convection heating surface under all operating modes.
Utility model content
The purpose of this utility model is the deficiency overcoming the said equipment technology, provide a kind of recirculation closed loop system for flue gas waste heat recovery, with closed cycle water or other liquid phase medium intermediate medium as heat exchange, and the gas cooler inlet water temperature remaining suitable is recycled by backwater, can ensure that gas cooler cold junction wall temperature is all higher than flue gas dew point under all operating modes, avoid the cold end corrosion of gas cooler, Mist heat recovering spreads out of through closed circuit to cold dielectric heater, can be used for the various cold medium heating suitable purposes, thus achieve making full use of of fume afterheat.
For achieving the above object, the utility model adopts following technical scheme:
For a recirculation closed loop system for flue gas waste heat recovery, comprise gas cooler, cold dielectric heater and control device;
The cold junction of described gas cooler is connected with cold dielectric heater cold junction by SAPMAC method pipeline, and its hot junction is connected with cold dielectric heater hot junction by thermal cycle pipeline, and its gas approach end is connected with smoke intake pipeline, and its smoke outlet is connected with smoke discharging pipe;
Recirculation conduit, itself and cold dielectric heater are arranged in parallel, and described recirculation conduit outlet is connected with SAPMAC method pipeline, and recirculation conduit entrance is connected with thermal cycle pipeline;
Described recirculation conduit is provided with recirculation control valve, changes recirculation circling water flow rate by regulating the aperture of described recirculation control valve;
SAPMAC method pipeline between described recirculation conduit outlet and cold dielectric heater cold junction is provided with main flow control valve, for the pressure reduction of regulating loop recirculation circuit, auxiliary adjustment recirculation circling water flow rate;
SAPMAC method pipeline between described recirculation conduit outlet and cold dielectric heater cold junction is also provided with expansion tank, for regulating the inlet pressure of gas cooler; Described recirculation control valve and main flow control valve are connected with control device respectively.
Cold junction and the SAPMAC method pipeline junction of described gas cooler are provided with the first temperature sensor.
The exhanst gas outlet of gas cooler is provided with the second temperature sensor.
First temperature sensor is also connected with control device respectively with the second temperature sensor.
SAPMAC method pipeline between described recirculation conduit outlet and the cold junction of gas cooler is provided with frequency variable circulating pump, and described frequency variable circulating pump is also connected with control device.
The beneficial effects of the utility model:
(1) by recycling control valve, main flow control valve and frequency variable circulating pump described in comprehensive adjustment, suitable gas cooler inlet water temperature all can be ensured under all operating modes, make gas cooler cold junction wall temperature all higher than flue gas dew point, avoid gas cooler generation cold end corrosion;
(2) the utility model is by closed circuit by flue gas and the isolation of cold medium, also prevents the pollution causing cold medium because heating surface reveals.
Accompanying drawing explanation
Fig. 1 is system schematic of the present utility model.
Wherein, 1-gas cooler, 11-smoke intake pipeline, 12-flue gas exhaust pipeline, the cold dielectric heater of 2-, 21-cold medium inlet pipeline, the cold medium discharge channel of 22-, 3-SAPMAC method pipeline, 31-main flow control valve, 32-expansion tank, 33-frequency variable circulating pump, 4-thermal cycle pipeline, 5-recirculation conduit, 6-recycles control valve, 7-first temperature sensor, 8-second temperature sensor.
Detailed description of the invention
Below in conjunction with accompanying drawing, specific embodiment of the utility model is described.
The course of work of the present utility model is:
Smoke evacuation flows through smoke intake pipeline 11 and enters gas cooler 1, release heat, flue gas exit temperature reduces, flue gas after cooling is discharged by flue gas exhaust pipeline 12, meanwhile, cold medium enters cold dielectric heater 2 from cold medium inlet pipeline 21, and the cold medium after heating is discharged from cold medium discharge channel 22, wherein, cold medium is liquid or the gas of various suitable purposes.
The waste heat that flue gas discharges is for heating the closed cycle intermediate medium flowing through gas cooler 1; Recirculated water after heating is divided into two-way after flowing into heat circulation pipe road 4, and after a road enters the heat release of cold dielectric heater 2, flow into SAPMAC method pipeline 3, recirculation conduit 5 of separately leading up to enters SAPMAC method pipeline 3.After two-way recirculated water is mixed to safe inlet water temperature, boost through frequency variable circulating pump 33, enter gas cooler 1 heat exchange, thus complete and once circulate.
When operating mode changes, detected temperature signal is transferred to control device by the first temperature sensor 7 and the second temperature sensor 8 respectively, meanwhile, the rotating speed of the frequency converter of circulating pump 33, and recirculation control valve 6 and main flow control valve 31 valve opening information also feed back to control device; Control device then regulates the rotating speed of the frequency converter of circulating pump 33 further according to the information received, and control the flow that recirculation control valve 6 and the valve opening of main flow control valve 31 regulate recirculation hot water in closed circuit and cool circulation water, the gas cooler inlet water temperature that final guarantee is suitable, make gas cooler cold junction wall temperature all higher than flue gas dew point, avoid gas cooler generation cold end corrosion.
By reference to the accompanying drawings detailed description of the invention of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (4)
1. for a recirculation closed loop system for flue gas waste heat recovery, it is characterized in that, comprise gas cooler, cold dielectric heater and control device;
The cold junction of described gas cooler is connected with cold dielectric heater cold junction by SAPMAC method pipeline, and its hot junction is connected with cold dielectric heater hot junction by thermal cycle pipeline, and its gas approach end is connected with smoke intake pipeline, and its smoke outlet is connected with smoke discharging pipe;
Recirculation conduit, itself and cold dielectric heater are arranged in parallel, and described recirculation conduit outlet is connected with SAPMAC method pipeline, and recirculation conduit entrance is connected with thermal cycle pipeline;
Described recirculation conduit is provided with recirculation control valve, changes recirculation circling water flow rate by regulating the aperture of described recirculation control valve;
SAPMAC method pipeline between described recirculation conduit outlet and cold dielectric heater cold junction is provided with main flow control valve, for the pressure reduction of regulating loop recirculation circuit, auxiliary adjustment recirculation circling water flow rate;
SAPMAC method pipeline between described recirculation conduit outlet and the cold junction of gas cooler is provided with frequency variable circulating pump;
Described recirculation control valve, main flow control valve are connected with control device respectively with frequency variable circulating pump.
2. a kind of recirculation closed loop system for flue gas waste heat recovery as claimed in claim 1, it is characterized in that, cold junction and the SAPMAC method pipe junction of described gas cooler are provided with the first temperature sensor, and described first temperature sensor is connected with control device.
3. a kind of recirculation closed loop system for flue gas waste heat recovery as claimed in claim 1, it is characterized in that, the exhanst gas outlet of described gas cooler is provided with the second temperature sensor, and described second temperature sensor is also connected with control device.
4. a kind of recirculation closed loop system for flue gas waste heat recovery as claimed in claim 1, it is characterized in that, SAPMAC method pipeline between described recirculation conduit outlet and cold dielectric heater cold junction is also provided with expansion tank, for regulating the inlet pressure of gas cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420749065.1U CN204285497U (en) | 2014-12-02 | 2014-12-02 | A kind of recirculation closed loop system for flue gas waste heat recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420749065.1U CN204285497U (en) | 2014-12-02 | 2014-12-02 | A kind of recirculation closed loop system for flue gas waste heat recovery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204285497U true CN204285497U (en) | 2015-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420749065.1U Expired - Fee Related CN204285497U (en) | 2014-12-02 | 2014-12-02 | A kind of recirculation closed loop system for flue gas waste heat recovery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204285497U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106440859A (en) * | 2016-08-26 | 2017-02-22 | 浙江天地环保科技有限公司 | Heat exchanger smoke temperature automatic adjusting system and control method |
-
2014
- 2014-12-02 CN CN201420749065.1U patent/CN204285497U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106440859A (en) * | 2016-08-26 | 2017-02-22 | 浙江天地环保科技有限公司 | Heat exchanger smoke temperature automatic adjusting system and control method |
| CN106440859B (en) * | 2016-08-26 | 2019-02-26 | 浙江天地环保科技有限公司 | A kind of control method of heat exchanger smoke temperature automatic regulating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20151202 |
|
| EXPY | Termination of patent right or utility model |