CN104864402A - Waste heat recycling air preheating bypass coal saving system and application thereof - Google Patents
Waste heat recycling air preheating bypass coal saving system and application thereof Download PDFInfo
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- CN104864402A CN104864402A CN201510293997.9A CN201510293997A CN104864402A CN 104864402 A CN104864402 A CN 104864402A CN 201510293997 A CN201510293997 A CN 201510293997A CN 104864402 A CN104864402 A CN 104864402A
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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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Abstract
The invention discloses a waste heat recycling air preheating bypass coal saving system and application thereof. A waste gas outlet of a boiler is connected with a gas inlet of a cyclone dust collector, a gas outlet of the cyclone dust collector is connected with a heat pipe of a heat exchanger, a branch is arranged at an opening of the cyclone dust collector and connected with a decompressor, and the decompressor is connected with the heat pipe of the heat exchanger in series. A heat pipe outlet of the heat exchanger is connected with a gas inlet of an electrostatic dust collector. A gas outlet of the electrostatic dust collector is provided with a second draught fan. A gas outlet of the second draught fan is connected with a waste gas cooler. The upper end of the waste gas cooler is provided with two circular ventilation holes. A circular gas outlet is provided with a sucking pump. The other end of the sucking pump is connected with a second preheater. A gas outlet of the second preheater is connected with a gas inlet of a first preheater. A gas outlet of the first preheater is connected with a circular gas inlet of the waste gas cooler to form a loop. The waste heat recycling air preheating bypass coal saving system is reasonable in design, easy and convenient to operate, high in preheat recycling rate, low in operation cost, capable of saving energy and protecting the environment and free of pollution to the air.
Description
Technical field
The invention belongs to reusing of energy source technical field, particularly a kind of waste heat recovery air preheat bypass economizes coal measures system and application thereof.
Background technology
Waste heat refers to the limitation by factors such as history, technology, theories, in the industrial enterprise's energy-dissipating device put into operation, and the sensible heat that original design is not used appropriately and latent heat.It comprises high-temp waste gas waste heat, cooling medium waste heat, waste vapour waste water residual heat, high-temperature product and afterheat of slags, chemical reaction waste heat, combustible exhaust gas waste liquid and waste material waste heat etc.According to investigation, the waste heat total resources of every profession and trade account for the 17%-67% of its fuel consumption total amount, and the residual heat resources of recoverable are about 60% of waste heat total resources.
Often containing the composition such as sulfur dioxide in useless flue gas in waste heat recovery apparatus, run into steam or moisture and can form sulfurous acid material corrosion is produced to tube sheet and weld seam, cause the Seepage of tube sheet or commissure, have a strong impact on the continuous prodution requirement of enterprise.For the problems referred to above, the method maintenance cycles such as traditional argon arc welding are long, and costly, and maintenance is often shorter for rear service life, and repairing effect is difficult to reach ideal effect.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of waste heat recovery air preheat bypass to economize coal measures system and application thereof, the present invention is reasonable in design, simple to operation, and pre-heat recovery rate is high, operating cost is low, energy-conserving and environment-protective, to free of air pollution.
In order to solve above technical problem, the invention provides a kind of waste heat recovery air preheat bypass and economize coal measures system, comprise boiler, spray column and cooling tower, the waste gas outlet of boiler connects the air inlet of cyclone dust collectors, the gas outlet of cyclone dust collectors connects the heat pipe of heat exchanger, and the exit of cyclone dust collectors is provided with branch road connection decompressor, decompressor is connected with the heat pipe of heat exchanger;
The heat pipe outlet of heat exchanger connects the air inlet of electrostatic precipitator, the gas outlet of electrostatic precipitator goes out to be provided with the second blower fan, the gas outlet of the second blower fan connects gaseous effluent, and gaseous effluent upper end is provided with two circulation ventilating mouths, is respectively circulation air inlet and recycles gas port;
Recycle gas port exit and be provided with aspiration pump, the other end of aspiration pump connects the second preheater, the gas outlet of the second preheater connects the air inlet of the first preheater, the circulation air inlet of gaseous effluent is got back in the gas outlet of the first preheater, first preheater lower end air inlet is provided with the first blower fan, its upper end air outlet connects the cold pipe of heat exchanger, and cold pipe connects the air inlet of boiler;
Gaseous effluent lower end is also provided with waste gas outlet, and waste gas outlet connects the air inlet of the first spray column, and the gas outlet of the first spray column connects the air inlet of the second spray column, and cooling tower is led in the gas outlet of the second spray column, cooling tower bottom ventilation;
Technique effect present system reasonable in design, operation is simple and convenient, without potential safety hazard, whole flow process is in low pressure stable state, and pre-heat recovery rate is high, farthest make use of preheating, consume, operating cost is low, is harmful to other process up to more than 95% in waste gas, the pollution to air reduced, energy-conserving and environment-protective.
The technical scheme that the present invention limits further is:
Preferably, in the first spray column, spray liquid is sodium hydroxide solution, and in the second spray column, spray liquid is water;
Preferably, be provided with liquid bath bottom the first spray column and the second spray column, liquid bath exports out and is provided with suction pump, and suction pump connects the ejecting liquid pipe on the first spray column and the second spray column top;
Hot waste gas first via the dust of cyclone dust collectors removing larger particles, not only can be improved efficiency of dust collection, increase the decline flow of section by the present invention, and the time of staying of dust laden air in deduster can be made again to increase, for dust creates more seperator meeting; Then first a part of heat is passed to the air entering boiler by heat exchanger, prevent heat to run off in the duct too much, heat utilization efficiency is provided; Hot waste gas enters in electrostatic precipitator subsequently, goes out fine solid particle particle further, prevents equipment because dust blocks and reduces operating efficiency, the physical life of extension device, reduces plant maintenance disposal costs; Then hot waste gas enters gaseous effluent, the first preheater is entered again via after the second preheater heating, in the first preheater, preheating is carried out to the air being about to enter boiler, waste gas after heat exchange is got back in gaseous effluent again, through twice spray, remove most pernicious gas, finally enter air.
Further,
The present invention also provides a kind of waste heat recovery air preheat bypass to economize coal systematic difference, and specific works flow process is as follows:
First the hot waste gas that boiler is discharged removes most of big dust particle via cyclone dust collectors, and then hot waste gas enters the heat pipe of heat exchanger by pipeline, simultaneously by regulating decompressor to control its air pressure inside;
First blower fan blasts air in the first preheater, and air enters the cold pipe of heat exchanger, carries out heat exchange with the hot waste gas in the heat pipe of heat exchanger, enters boiler after air is heated;
Hot waste gas in the heat pipe of heat exchanger is entered in electrostatic precipitator by pipeline and carries out final dusting, after getting rid of fine dust particles, hot waste gas enters gaseous effluent by the effect of the second blower fan, the waste gas do not cooled completely recycles gas port through gaseous effluent, the second preheater is entered under the effect of aspiration pump, waste gas after again heating gets back to the first preheater by pipeline, preheating is carried out to the air entered into wherein, the waste gas after heat exchange is carried out via pipeline with air, again get back to gaseous effluent from the circulation air inlet of gaseous effluent,
Cold waste gas through circulation enters the first spray column from the waste gas outlet of gaseous effluent lower end, most sour gas is removed by sodium hydroxide solution, then waste gas enters the air inlet of the second spray column from the gas outlet of the first spray column upper end, by other pernicious gases of water-soluble solution, spray liquid in first spray column and the second spray column is finally all got back in the liquid bath bottom it, recycles under the effect of suction pump;
The waste gas removed after sour gas enters in cooling tower by the gas outlet of the second spray column upper end, and under the effect of cooling tower bottom air, waste gas enters air from the outlet of cooling tower upper end.
The invention has the beneficial effects as follows:
Hot waste gas first via the dust of cyclone dust collectors removing larger particles, not only can be improved efficiency of dust collection, increase the decline flow of section by the present invention, and the time of staying of dust laden air in deduster can be made again to increase, for dust creates more seperator meeting; Then first a part of heat is passed to the air entering boiler by heat exchanger, prevent heat to run off in the duct too much, heat utilization efficiency is provided; Hot waste gas enters in electrostatic precipitator subsequently, goes out fine solid particle particle further, prevents equipment because dust blocks and reduces operating efficiency, the physical life of extension device, reduces plant maintenance disposal costs; Then hot waste gas enters gaseous effluent, the first preheater is entered again via after the second preheater heating, in the first preheater, preheating is carried out to the air being about to enter boiler, waste gas after heat exchange is got back in gaseous effluent again, through twice spray, remove most pernicious gas, finally enter air.
Accompanying drawing explanation
The waste heat recovery air preheat bypass of Fig. 1 designed by the present invention economizes the connection diagram of coal measures system;
Wherein, 1-boiler, 2-cyclone dust collectors, 3-decompressor, 4-heat exchanger, 5-first preheater, 6-first blower fan, 7-second preheater, 8-electrostatic precipitator, 9-second blower fan, 10-aspiration pump, 11-gaseous effluent, 12-first spray column, 13-second spray column, 14-cooling tower.
Detailed description of the invention
embodiment 1
The present embodiment provides a kind of waste heat recovery air preheat bypass to economize coal measures system, structure as shown in Figure 1, comprise boiler 1, spray column and cooling tower 14, the waste gas outlet of boiler 1 connects the air inlet of cyclone dust collectors 2, the gas outlet of cyclone dust collectors 2 connects the heat pipe of heat exchanger 4, and the exit of cyclone dust collectors 2 is provided with branch road connection decompressor 3, decompressor 3 is connected with the heat pipe of heat exchanger 4;
The heat pipe outlet of heat exchanger 4 connects the air inlet of electrostatic precipitator 8, the gas outlet of electrostatic precipitator 8 goes out to be provided with the second blower fan 9, the gas outlet of the second blower fan 9 connects gaseous effluent 11, and gaseous effluent 11 upper end is provided with two circulation ventilating mouths, is respectively circulation air inlet and recycles gas port;
Recycle gas port exit and be provided with aspiration pump 10, the other end of aspiration pump 10 connects the second preheater 7, the gas outlet of the second preheater 7 connects the air inlet of the first preheater 5, the circulation air inlet of gaseous effluent 11 is got back in the gas outlet of the first preheater 5, first preheater 5 lower end air inlet is provided with the first blower fan 6, its upper end air outlet connects the cold pipe of heat exchanger 4, and cold pipe connects the air inlet of boiler 1;
Gaseous effluent 11 lower end is also provided with waste gas outlet, waste gas outlet connects the air inlet of the first spray column 12, the gas outlet of the first spray column 12 connects the air inlet of the second spray column 13, and cooling tower 14 is led in the gas outlet of the second spray column 13, cooling tower 14 bottom ventilation.
The present embodiment also provides a kind of waste heat recovery air preheat bypass to economize coal systematic difference, and specific works flow process is as follows:
First the hot waste gas that boiler 1 is discharged removes most of big dust particle via cyclone dust collectors 2, and then hot waste gas enters the heat pipe of heat exchanger 4 by pipeline, simultaneously by regulating decompressor 3 to control its air pressure inside;
First blower fan 6 blasts air in the first preheater 5, and air enters the cold pipe of heat exchanger 4, carries out heat exchange, enter boiler 1 after air is heated with the hot waste gas in the heat pipe of heat exchanger 4;
Hot waste gas in the heat pipe of heat exchanger 4 is entered in electrostatic precipitator 8 by pipeline and carries out final dusting, after getting rid of fine dust particles, hot waste gas enters gaseous effluent 11 by the effect of the second blower fan 9, the waste gas do not cooled completely recycles gas port through gaseous effluent 11, the second preheater 7 is entered under the effect of aspiration pump 10, waste gas after again heating gets back to the first preheater 5 by pipeline, preheating is carried out to the air entered into wherein, the waste gas after heat exchange is carried out via pipeline with air, again get back to gaseous effluent 11 from the circulation air inlet of gaseous effluent 11,
Cold waste gas through circulation enters the first spray column 12 from the waste gas outlet of gaseous effluent 11 lower end, most sour gas is removed by hydrogen spray liquid, then waste gas enters the air inlet of the second spray column 13 from the gas outlet of the first spray column 12 upper end, other pernicious gases are dissolved by spray liquid, spray liquid in first spray column 12 and the second spray column 13 is finally all got back in the liquid bath bottom it, recycles under the effect of suction pump;
The waste gas removed after sour gas enters in cooling tower 14 by the gas outlet of the second spray column 13 upper end, and under the effect of cooling tower 14 bottom air, waste gas enters air from the outlet of cooling tower 14 upper end.
embodiment 2
The present embodiment provides a kind of waste heat recovery air preheat bypass to economize coal measures system, structure as shown in Figure 1, comprise boiler 1, spray column and cooling tower 14, the waste gas outlet of boiler 1 connects the air inlet of cyclone dust collectors 2, the gas outlet of cyclone dust collectors 2 connects the heat pipe of heat exchanger 4, and the exit of cyclone dust collectors 2 is provided with branch road connection decompressor 3, decompressor 3 is connected with the heat pipe of heat exchanger 4;
The heat pipe outlet of heat exchanger 4 connects the air inlet of electrostatic precipitator 8, the gas outlet of electrostatic precipitator 8 goes out to be provided with the second blower fan 9, the gas outlet of the second blower fan 9 connects gaseous effluent 11, and gaseous effluent 11 upper end is provided with two circulation ventilating mouths, is respectively circulation air inlet and recycles gas port;
Recycle gas port exit and be provided with aspiration pump 10, the other end of aspiration pump 10 connects the second preheater 7, the gas outlet of the second preheater 7 connects the air inlet of the first preheater 5, the circulation air inlet of gaseous effluent 11 is got back in the gas outlet of the first preheater 5, first preheater 5 lower end air inlet is provided with the first blower fan 6, its upper end air outlet connects the cold pipe of heat exchanger 4, and cold pipe connects the air inlet of boiler 1;
Gaseous effluent 11 lower end is also provided with waste gas outlet, waste gas outlet connects the air inlet of the first spray column 12, the gas outlet of the first spray column 12 connects the air inlet of the second spray column 13, and cooling tower 14 is led in the gas outlet of the second spray column 13, cooling tower 14 bottom ventilation.
In first spray column 12, spray liquid is sodium hydroxide solution, and in the second spray column 13, spray liquid is water.
The present embodiment also provides a kind of waste heat recovery air preheat bypass to economize coal systematic difference, and specific works flow process is as follows:
First the hot waste gas that boiler 1 is discharged removes most of big dust particle via cyclone dust collectors 2, and then hot waste gas enters the heat pipe of heat exchanger 4 by pipeline, simultaneously by regulating decompressor 3 to control its air pressure inside;
First blower fan 6 blasts air in the first preheater 5, and air enters the cold pipe of heat exchanger 4, carries out heat exchange, enter boiler 1 after air is heated with the hot waste gas in the heat pipe of heat exchanger 4;
Hot waste gas in the heat pipe of heat exchanger 4 is entered in electrostatic precipitator 8 by pipeline and carries out final dusting, after getting rid of fine dust particles, hot waste gas enters gaseous effluent 11 by the effect of the second blower fan 9, the waste gas do not cooled completely recycles gas port through gaseous effluent 11, the second preheater 7 is entered under the effect of aspiration pump 10, waste gas after again heating gets back to the first preheater 5 by pipeline, preheating is carried out to the air entered into wherein, the waste gas after heat exchange is carried out via pipeline with air, again get back to gaseous effluent 11 from the circulation air inlet of gaseous effluent 11,
Cold waste gas through circulation enters the first spray column 12 from the waste gas outlet of gaseous effluent 11 lower end, most sour gas is removed by sodium hydroxide solution, then waste gas enters the air inlet of the second spray column 13 from the gas outlet of the first spray column 12 upper end, by other pernicious gases of water-soluble solution, spray liquid in first spray column 12 and the second spray column 13 is finally all got back in the liquid bath bottom it, recycles under the effect of suction pump;
The waste gas removed after sour gas enters in cooling tower 14 by the gas outlet of the second spray column 13 upper end, and under the effect of cooling tower 14 bottom air, waste gas enters air from the outlet of cooling tower 14 upper end.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (4)
1. a waste heat recovery air preheat bypass economizes coal measures system, comprise boiler (1), spray column and cooling tower (14), it is characterized in that, the waste gas outlet of described boiler (1) connects the air inlet of cyclone dust collectors (2), the gas outlet of described cyclone dust collectors (2) connects the heat pipe of heat exchanger (4), and the exit of cyclone dust collectors (2) is provided with branch road connection decompressor (3), described decompressor (3) is connected with the heat pipe of heat exchanger (4);
The heat pipe outlet of described heat exchanger (4) connects the air inlet of electrostatic precipitator (8), the gas outlet of described electrostatic precipitator (8) goes out to be provided with the second blower fan (9), the gas outlet of described second blower fan (9) connects gaseous effluent (11), described gaseous effluent (11) upper end is provided with two circulation ventilating mouths, is respectively circulation air inlet and recycles gas port;
The described gas port exit that recycles is provided with aspiration pump (10), the other end of described aspiration pump (10) connects the second preheater (7), the gas outlet of described second preheater (7) connects the air inlet of the first preheater (5), the circulation air inlet of gaseous effluent (11) is got back in the gas outlet of described first preheater (5), described first preheater (5) lower end air inlet is provided with the first blower fan (6), its upper end air outlet connects the cold pipe of described heat exchanger (4), and described cold pipe connects the air inlet of boiler (1);
Described gaseous effluent (11) lower end is also provided with waste gas outlet, described waste gas outlet connects the air inlet of the first spray column (12), the gas outlet of described first spray column (12) connects the air inlet of the second spray column (13), cooling tower (14) is led in the gas outlet of described second spray column (13), described cooling tower (14) bottom ventilation.
2. waste heat recovery air preheat bypass according to claim 1 economizes coal measures system, and it is characterized in that, the interior spray liquid of described first spray column (12) is sodium hydroxide solution, and the second spray column (13) interior spray liquid is water.
3. waste heat recovery air preheat bypass according to claim 1 economizes coal measures system, it is characterized in that, described first spray column (12) and the second spray column (13) bottom are provided with liquid bath, liquid bath exports out and is provided with suction pump, and described suction pump connects the ejecting liquid pipe on the first spray column (12) and the second spray column (13) top.
4. the waste heat recovery air preheat bypass according to the arbitrary claim of claim 1-3 economizes coal systematic difference, and it is characterized in that, specific works flow process is as follows:
First the hot waste gas that boiler (1) is discharged removes most of big dust particle via cyclone dust collectors (2), and then hot waste gas enters the heat pipe of heat exchanger (4) by pipeline, simultaneously by regulating decompressor (3) to control its air pressure inside;
First blower fan (6) blasts air in the first preheater (5), and air enters the cold pipe of heat exchanger (4), carries out heat exchange with the hot waste gas in the heat pipe of heat exchanger (4), enters boiler (1) after air is heated;
Hot waste gas in the heat pipe of heat exchanger (4) is entered in electrostatic precipitator (8) by pipeline and carries out final dusting, after getting rid of fine dust particles, hot waste gas enters gaseous effluent (11) by the effect of the second blower fan (9), the waste gas do not cooled completely recycles gas port through gaseous effluent (11), the second preheater (7) is entered under the effect of aspiration pump (10), waste gas after again heating gets back to the first preheater (5) by pipeline, preheating is carried out to the air entered into wherein, the waste gas after heat exchange is carried out via pipeline with air, again get back to gaseous effluent (11) from the circulation air inlet of gaseous effluent (11),
Cold waste gas through circulation enters the first spray column (12) from the waste gas outlet of gaseous effluent (11) lower end, most sour gas is removed by sodium hydroxide solution, then waste gas enters the air inlet of the second spray column (13) from the gas outlet of the first spray column (12) upper end, by other pernicious gases of water-soluble solution, spray liquid in first spray column (12) and the second spray column (13) is finally all got back in the liquid bath bottom it, recycles under the effect of suction pump;
The waste gas removed after sour gas enters in cooling tower (14) by the gas outlet of the second spray column (13) upper end, and under the effect of cooling tower (14) bottom air, waste gas enters air from the outlet of cooling tower (14) upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510293997.9A CN104864402A (en) | 2015-06-01 | 2015-06-01 | Waste heat recycling air preheating bypass coal saving system and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510293997.9A CN104864402A (en) | 2015-06-01 | 2015-06-01 | Waste heat recycling air preheating bypass coal saving system and application thereof |
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| CN104864402A true CN104864402A (en) | 2015-08-26 |
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| CN201510293997.9A Pending CN104864402A (en) | 2015-06-01 | 2015-06-01 | Waste heat recycling air preheating bypass coal saving system and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953245A (en) * | 2016-05-13 | 2016-09-21 | 安徽瑞丝环保能源有限公司 | Straw incineration system capable of fully using energy generated by straw combustion |
| CN107559875A (en) * | 2016-06-30 | 2018-01-09 | 保定市金能换热设备有限公司 | A kind of combustion gas method for effectively reducing gas furnace discharged nitrous oxides |
-
2015
- 2015-06-01 CN CN201510293997.9A patent/CN104864402A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105953245A (en) * | 2016-05-13 | 2016-09-21 | 安徽瑞丝环保能源有限公司 | Straw incineration system capable of fully using energy generated by straw combustion |
| CN107559875A (en) * | 2016-06-30 | 2018-01-09 | 保定市金能换热设备有限公司 | A kind of combustion gas method for effectively reducing gas furnace discharged nitrous oxides |
| CN107559864A (en) * | 2016-06-30 | 2018-01-09 | 保定市金能换热设备有限公司 | A kind of combustion gas method for effectively improving combustion gas furnace thermal efficiency |
| CN107559875B (en) * | 2016-06-30 | 2019-05-03 | 保定市金能换热设备有限公司 | A kind of combustion gas method that gas furnace discharged nitrous oxides are effectively reduced |
| CN107559864B (en) * | 2016-06-30 | 2019-05-03 | 保定市金能换热设备有限公司 | A kind of combustion gas method effectively improving combustion gas furnace thermal efficiency |
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Application publication date: 20150826 |