CN103089359A - Device and method for utilizing plastic manufacturing technique waste gas and low temperature exhaust heat to generate electricity - Google Patents
Device and method for utilizing plastic manufacturing technique waste gas and low temperature exhaust heat to generate electricity Download PDFInfo
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- CN103089359A CN103089359A CN2013100335636A CN201310033563A CN103089359A CN 103089359 A CN103089359 A CN 103089359A CN 2013100335636 A CN2013100335636 A CN 2013100335636A CN 201310033563 A CN201310033563 A CN 201310033563A CN 103089359 A CN103089359 A CN 103089359A
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Abstract
The invention discloses a device and a method for utilizing plastic manufacturing technique waste gas and low temperature exhaust heat to generate electricity. Plastic manufacturing technique waste gas enters an evaporator through a pipeline to carry out heat exchange. Hot waste gas which is produced after the heat exchange is carried out on the waste gas enters a material recoverer to be recovered. A high pressure gaseous state power generation medium after absorbing heat enters a double-screw expander, expansion is acted to push the double-screw expander to operate and therefore a generator is driven to generate the electricity. A later discharged low pressure gas-liquid two-phase power generation medium enters a condenser to carry out the heat exchange with cooling water and then becomes a liquid state. The liquid state power generation medium enters a preheater through a high pressure working medium pump to be preheated and then enters the evaporator to be continuous to absorb waste heat of the waste gas, the cooling water discharged from the condenser enters a water cooling tower, and heat of cooling is released for duty-cycle operation. The device is simple in structure, stable in operation, low in cost and high in power generation efficiency, solves the problem of low recovery and use ratio of the plastic manufacturing technique waste gas low temperature exhaust heat and has a certain economic and environmental benefits.
Description
Technical field
The invention belongs to the low temperature exhaust heat recovery technology, relate to the heat recovery of gaseous substance in cooling procedure, refer to especially in the plastic cement production technology, to the discharging the waste heat gas cooling down time waste heat recycling.
Background technique
In recent years, the recycling of industrial exhaust heat becomes more and more important role in energy-saving and emission-reduction.Have 50% finally directly to discharge with the form of low-grade exhaust heat in the heat energy that the mankind utilize.Industrial exhaust heat generally is divided into the high-temperature residual heat more than 400 ℃, middle temperature waste heat and the low temperature exhaust heat below 150 ℃ of 400 ℃-150 ℃.In recent years, the high-temperature residual heat and the middle temperature cogeneration technology that are used for recovered flue gas had obtained the popularization of wide model, and had obtained good economic and environmental benefit.But for the low temperature exhaust heat below 150 ℃, be mainly to recycle in the mode of heat exchange, as flue gas, technology waste gas etc.
Electric energy is high-grade energy, along with China's rapid development of economy, China's industry is increasing to the demand of electric power resource, especially in recent years, the situation that supply falls short of demand has appearred in the supply of electric power resource, the area that even has to the Enterprises of high electricity consumption the electricity consumption restriction.If UTILIZATION OF VESIDUAL HEAT IN a large amount of in production technology can be got up, changing into electric power output, to resupply enterprise personal or be incorporated into the power networks, and will alleviate the cost that enterprise increases because of electricity consumption, forms the good circulation of the utilization of resources.At present, increasing enterprise has all introduced cogeneration technology, but for the cogeneration below 150 ℃, still has at present technical difficulty.
Waste heat gas in the plastic cement explained hereafter generally between 130-160 ℃, needs to cool before discharging, makes the raw material that wherein contains be able to condensation and reclaims.The recovering device schematic diagram of existing plastic cement production technology waste gas as shown in Figure 1, comprise the waste gas generating means 1, water-cooling heat-exchange device 12, the cooling tower 3 that connect successively by pipeline, water-cooling heat-exchange device 12 forms the loop with cooling tower 3 by the pipeline that water cooling pump 4 is housed, and water-cooling heat-exchange device 12 also connects material recover 5.When utilizing this device to process waste gas, emit a large amount of low temperature exhaust heats in cooling procedure, but can not be utilized effectively, all be discharged in environment.This technique has not only been wasted the energy in a large number, has also greatly polluted environment simultaneously.
Summary of the invention
The present invention is the defects that exists in order to solve prior art, and a kind of apparatus and method of utilizing plastic cement production technology waste gas low-temperature cogeneration are provided, to reach the fully efficient purpose of utilizing of plastic cement production technology waste gas low temperature exhaust heat.
The present invention is achieved by the following technical solutions:
a kind of device that utilizes plastic cement production technology waste gas low-temperature cogeneration comprises the waste gas generating means, vaporizer, low-temperature electricity-generating unit and the cooling tower that connect successively by pipeline, described low-temperature electricity-generating unit is connected to form the loop with vaporizer, cooling tower respectively by pipeline, described low-temperature electricity-generating unit comprises twin-screw expander, condenser, cooling waterpump, the high-pressure working medium pump, preheater and generator, the output shaft of wherein said twin-screw expander connects generator, input end is connected with an output terminal of vaporizer, output terminal is connected with an input end of condenser, an output terminal of described condenser is connected with the input end of preheater by the pipeline that is provided with the high-pressure working medium pump, another output terminal is connected with the input end of cooling tower, another input end of condenser and the output terminal of cooling tower are connected to form the loop by the pipeline that is provided with cooling waterpump, the output terminal of described preheater is connected with another input end of vaporizer, another output terminal of described vaporizer is connected with the material recycle device by pipeline.
Further, described generator is three-phase synchronous generator.
the present invention also provides a kind of use above-mentioned electricity generating device, utilize the method for plastic cement production technology waste gas low-temperature cogeneration, plastic cement production technology waste gas to be entered vaporizer by the road carry out heat exchange, carrying out hot waste gas after heat exchange enters into the material recycle device and carries out material recycle, high-pressure gaseous power generation medium after the absorption heat enters twin-screw expander, expand and do work and promote the twin-screw expander running, thereby drive the generator operation generating, the low-pressure gas-liquid two-phase power generation medium of discharging afterwards enters condenser and cooling water and carries out liquefy after heat exchange, liquid power generation medium enters through the high-pressure working medium pump and enters vaporizer continuation absorption waste gas residual heat heat after preheater is completed preheating, the cooling water that condenser is discharged enters cooling tower, recycle after discharging the heat of cooling.
Technological scheme of the present invention has very high economy and environmental benefit.Take certain plastic cement factory as example, the toxic emission temperature of its wall scroll production line is at 130-160 ℃, per hour discharge amount is 20,000 cubes, utilize water quench to 50 ℃ before discharging, make industrial chemicals wherein be able to the condensation recovery, the after-heat of cooling heat and waste gas all discharges atmosphere, and equal production line this enterprise has 84 more than, and its every day, externally the heat of discharging can reach 1,400,000 kWh; After adopting this programme, guaranteeing that the cooling rear temperature of waste hot gas meets the requirements of 50 ℃ and not under the prerequisite to original technique increase extra duty, realized low-temperature cogeneration, the generated energy of wall scroll production line just can reach 35kW, by 350 days, annual electricity generating capacity was 3 * 10
5KWh, year minimizing CO
2Discharge 213 tons.
Compared with prior art, the present invention has the following advantages:
Apparatus of the present invention utilize low temperature waste gas as thermal source, adopt twin-screw expander, vaporizer, condenser etc. to form the low-temperature electricity-generating unit, simple in structure, operate steadily, cost is low, generating efficiency is higher, solved well the low problem of plastic cement production technology waste gas low temperature exhaust heat recovery utilization rate, can alleviate to a certain extent the problem of business electrical anxiety, have certain economy and environment benefit.
Description of drawings
Fig. 1 is existing plastic cement technology waste gas recovering device structural representation.
Fig. 2 is the structural representation that the present invention utilizes the dress of plastic cement production technology waste gas low-temperature cogeneration.
Fig. 3 is the structural representation of low-temperature electricity-generating unit 6 in Fig. 2.
Wherein: 1-waste gas generating means, 2-vaporizer, 3-cooling tower, 4-cooling waterpump, 5-material recycle device, 6-low-temperature electricity-generating unit, 7-twin-screw expander, 8-condenser, 9-high-pressure working medium pump, 10-preheater, 11-generator, 12-water-cooling heat-exchange device.
Embodiment
Below in conjunction with accompanying drawing, apparatus and method of the present invention are described further.
the device that utilizes plastic cement production technology waste gas low-temperature cogeneration as shown in Fig. 2,3 comprises the waste gas generating means 1, vaporizer 2, low-temperature electricity-generating unit 6, the cooling tower 3 that connect successively by pipeline, described low-temperature electricity-generating unit 6 is connected to form the loop with vaporizer 2, cooling tower 3 respectively by pipeline, described low-temperature electricity-generating unit 6 comprises twin-screw expander 7, condenser 8, cooling waterpump 4, high-pressure working medium pump 9, preheater 10, generator 11, the output shaft of wherein said twin-screw expander 7 connects generator 11, input end is connected with an output terminal of vaporizer 2, output terminal is connected with an input end of condenser 8, an output terminal of described condenser 8 is connected with the input end of preheater 10 by the pipeline that is provided with high-pressure working medium pump 9, another output terminal is connected with the input end of cooling tower 3, another input end of condenser 8 and the output terminal of cooling tower 3 are connected to form the loop by the pipeline that is provided with cooling waterpump 4, the output terminal of described preheater 10 is connected with another input end of vaporizer 2, another output terminal of described vaporizer 2 also is connected with material recycle device 5 by pipeline.
use the method for said apparatus generating, the plastic cement production technology waste gas that waste gas generating means 1 produces to be entered vaporizer 2 by the road carry out heat exchange, carrying out hot waste gas after heat exchange enters into material recycle device 5 and carries out material recycle, high-pressure gaseous power generation medium after the absorption heat enters twin-screw expander 7, expand and do work and promote the twin-screw expander running, thereby drive generator 11 operation generatings, the low-pressure gas-liquid two-phase power generation medium of discharging afterwards enters condenser 8 and cooling water and carries out liquefy after heat exchange, liquid power generation medium enters through high-pressure working medium pump 9 and enters vaporizer 2 continuation absorption waste gas residual heat heats after preheater 10 is completed preheating, the cooling water that condenser 8 is discharged enters cooling tower 3, recycle after discharging the heat of cooling.
Utilize said apparatus and method that certain plastic cement factory waste gas is reclaimed, both can guarantee that the cooling rear temperature of waste hot gas meets the requirements of 50 ℃, increase extra duty for again original technique, realized low-temperature cogeneration, the annual electricity generating capacity of wall scroll production line is 3 * 10
5KWh, year minimizing CO
2Discharge 213 tons.
Claims (3)
1. a device that utilizes plastic cement production technology waste gas low-temperature cogeneration, is characterized in that comprising the waste gas generating means (1), vaporizer (2), low-temperature electricity-generating unit (6) and the cooling tower (3) that connect successively by pipeline, described low-temperature electricity-generating unit (6) is connected to form the loop with vaporizer (2), cooling tower (3) respectively by pipeline, described low-temperature electricity-generating unit (6) comprises twin-screw expander (7), condenser (8), cooling waterpump (4), high-pressure working medium pump (9), preheater (10) and generator (11), the output shaft of wherein said twin-screw expander (7) connects generator (11), input end is connected with an output terminal of vaporizer (2), output terminal is connected with an input end of condenser (8), an output terminal of described condenser (8) is connected with the input end of preheater (10) by the pipeline that is provided with high-pressure working medium pump (9), another output terminal is connected with the input end of cooling tower (3), the output terminal of another input end of condenser (8) and cooling tower (3) is connected to form the loop by the pipeline that is provided with cooling waterpump (4), the output terminal of described preheater (10) is connected with another input end of vaporizer (2), another output terminal of described vaporizer (2) is connected with material recycle device (5) by pipeline.
2. the device that utilizes plastic cement production technology waste gas low-temperature cogeneration according to claim 1, is characterized in that described generator (11) is three-phase synchronous generator.
3. method of utilizing plastic cement production technology waste gas low-temperature cogeneration with the described device of claim 1, it is characterized in that plastic cement production technology waste gas enters by the road vaporizer and carries out heat exchange, carrying out hot waste gas after heat exchange enters into the material recycle device and carries out material recycle, high-pressure gaseous power generation medium after the absorption heat enters twin-screw expander, expand and do work and promote the twin-screw expander running, thereby drive the generator operation generating, the low-pressure gas-liquid two-phase power generation medium of discharging afterwards enters condenser and cooling water and carries out liquefy after heat exchange, liquid power generation medium enters through the high-pressure working medium pump and enters vaporizer continuation absorption waste gas residual heat heat after preheater is completed preheating, the cooling water that condenser is discharged enters cooling tower, recycle after discharging the heat of cooling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105888758A (en) * | 2016-06-15 | 2016-08-24 | 珠海华润包装材料有限公司 | Generation device for circularly utilizing tail gas of esterification process tower |
| CN109139163A (en) * | 2018-09-12 | 2019-01-04 | 技新（浙江）节能技术有限公司 | A kind of apparatus and method of low-temperature cogeneration |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0989202A (en) * | 1995-09-25 | 1997-04-04 | Hitachi Ltd | Waste power generating device |
| JPH09125914A (en) * | 1995-11-08 | 1997-05-13 | Hitachi Ltd | Waste incineration heat utilization system |
| CN1959200A (en) * | 2005-10-31 | 2007-05-09 | 天润成（北京）资源节能科技有限公司 | Power generation by backheat, waste heat in single voltage and low parameters |
| CN102435077A (en) * | 2011-11-04 | 2012-05-02 | 孙慕文 | Process and device for waste heat recycling and efficiency power generation of metallurgy waste heat gas |
| CN103089358A (en) * | 2013-01-22 | 2013-05-08 | 天津大学 | Method and device for generating electricity by low-temperature residual heat of plastic production technology waste gas |
| CN203035277U (en) * | 2013-01-29 | 2013-07-03 | 山西易通环能科技集团有限公司 | Power generating device by using low temperature waste heat of waste gas in plastic production process |
-
2013
- 2013-01-29 CN CN2013100335636A patent/CN103089359A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0989202A (en) * | 1995-09-25 | 1997-04-04 | Hitachi Ltd | Waste power generating device |
| JPH09125914A (en) * | 1995-11-08 | 1997-05-13 | Hitachi Ltd | Waste incineration heat utilization system |
| CN1959200A (en) * | 2005-10-31 | 2007-05-09 | 天润成（北京）资源节能科技有限公司 | Power generation by backheat, waste heat in single voltage and low parameters |
| CN102435077A (en) * | 2011-11-04 | 2012-05-02 | 孙慕文 | Process and device for waste heat recycling and efficiency power generation of metallurgy waste heat gas |
| CN103089358A (en) * | 2013-01-22 | 2013-05-08 | 天津大学 | Method and device for generating electricity by low-temperature residual heat of plastic production technology waste gas |
| CN203035277U (en) * | 2013-01-29 | 2013-07-03 | 山西易通环能科技集团有限公司 | Power generating device by using low temperature waste heat of waste gas in plastic production process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105888758A (en) * | 2016-06-15 | 2016-08-24 | 珠海华润包装材料有限公司 | Generation device for circularly utilizing tail gas of esterification process tower |
| CN109139163A (en) * | 2018-09-12 | 2019-01-04 | 技新（浙江）节能技术有限公司 | A kind of apparatus and method of low-temperature cogeneration |
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Application publication date: 20130508 |