CN102914085A - Cooling water waste heat recycling system - Google Patents
Cooling water waste heat recycling system Download PDFInfo
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- CN102914085A CN102914085A CN2012104386929A CN201210438692A CN102914085A CN 102914085 A CN102914085 A CN 102914085A CN 2012104386929 A CN2012104386929 A CN 2012104386929A CN 201210438692 A CN201210438692 A CN 201210438692A CN 102914085 A CN102914085 A CN 102914085A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention discloses a cooling water waste heat recycling system, which comprises a cold water tank, a circulating pump A, a heat production device, a hot water tank, a circulating pump B, a variable frequency pump, a plate type heat exchanger A, a circulating pump C, a small water tank, a heat pump unit, a circulating pump D, a hot water tank, a water supply pump, a plate type heat exchanger B and a cooling tower. The cooling water waste heat recycling system transfers the energy of cooling water to the heat pump by using the plate type heat exchanger A, and then converts the low temperature heat transferred by the plate type heat exchanger into high temperature heat energy by using the heat pump, the water in the hot water tank is used as a carrier of the high temperature heat energy, and the temperature is up to 60 DEG C, so that the use occasions are increased. According to the cooling water waste heat recycling system, the heat supplied to the heat pump is indirectly adjusted by using the plate type heat exchanger A and the variable-frequency pump, so that the temperature of water entering the heat pump of a third internal circulation is stable and is less than 32 DEG C, and the service life of the heat pump as well as the reliability and stability of the waste heat recovery are ensured. The normal temperature water injected in the hot water tank firstly passes through the plate type heat exchanger B, so that the energy consumption in the waste heat recovery process is reduced.
Description
Technical field
The present invention relates to heat recovery technology, particularly relate to the residual neat recovering system that utilizes heat pump to reclaim cooling water heat.
Background technology
The industrial energy consumption of China accounts for the 62%-70% of total energy consumption, and wherein the cooling water recirculation system energy consumption can account for half of industrial production energy consumption.The efficiency of energy utilization 30%-40% only of industry, nearly half heat directly is discharged in the atmosphere by cooling water, has both wasted a large amount of heat energy, causes again environmental pollution.Because the cooling water typical temperature is lower, generally is lower than 35 ℃, belongs to low-grade heat source, the occasion that can directly utilize is few, and this brings certain difficulty to waste heat recovery.Increasingly mature along with heat pump techniques utilizes the heat pump recovery waste heat to become a new method of waste heat recovery.
Existing cooling water waste heat recovering system mainly is to utilize heat transmission equipment (such as heat exchanger) directly to carry out heat exchange.The process program principle of directly carrying out heat exchange with heat transmission equipment (such as heat exchanger) as shown in Figure 1, it is constant to keep original cooling system, increases residual neat recovering system in original cooling system.The capital equipment of original cooling system comprises circulating pump, heat exchanger, cooling system, control system and pipeline etc.The transmittance process of its energy is: the equipment of required cooling---heat-source Cycles water---heat exchanger---recirculated water to be heated.
The major defect of this system: by the operation principle of heat exchanger as can be known, carry out in the process of heat exchange at heat exchanger, the temperature of recirculated water to be heated is necessarily less than the temperature of heat source water.If the temperature of the recirculated water that the temperature of heat source water is high then not to be heated can be lower, add the thermal loss in the transmission course, it is lower that the temperature of water can become, and value is not high, and the occasion that this scheme can directly be utilized in the waste heat recovery process of industrial colling is very limited.
Heat pump techniques is the new energy technology that receives much attention in the whole world in recent years.Heat pump is a kind of to consume the device of a part of low-grade energy as compensating, heat energy being transmitted from low-temperature heat source to high temperature heat source.Heat pump can be sent to high temp objects from cryogenic object with 3 to 4 times heat energy of self institute's energy requirement.Because heat pump can be converted to high temperature heat with low temperature heat energy, improve the effective rate of utilization of the energy, therefore become the important channel of reclaiming the energy that stores in the low temperature exhaust heat.
But heat pump is higher to the stability requirement of heat source water temperature, and the temperature of heat source water can not be greater than 32 ℃, and the speed of heat source water variations in temperature should be less than 1.1 ℃/minutes.If the cooling water in the industry is directly squeezed into source pump, usually can cause the source pump cisco unity malfunction, the stability that therefore guarantees the source heat pump heat coolant-temperature gage is an emphasis in the cooling water waste heat recovering system.
Summary of the invention
Be to solve the problems referred to above that prior art exists, the present invention will design a kind of cooling water waste heat recovering system that not only can utilize low-grade heat source but also can guarantee source heat pump heat coolant-temperature gage stability.
To achieve these goals, technical scheme of the present invention is as follows: a kind of cooling water waste heat recovering system comprises water cooling pond, circulating pump A, heating equipment, hot-tub, circulating pump B, variable frequency pump, plate type heat exchanger A, circulating pump C, little water tank, source pump, circulating pump D, boiler, supply-water pump, plate type heat exchanger B, cooling tower; The outlet of described water cooling pond connects circulating pump A, heating equipment and hot-tub successively by pipeline; Described hot-tub has two outlets, and the outlet of its top is connected to the entrance of water cooling pond by pipeline through cooling tower, and its underpart outlet is connected to the entrance of plate type heat exchanger A through variable frequency pump by pipeline; Described plate type heat exchanger A has two outlets, its left side outlet is connected to the entrance of water cooling pond through plate type heat exchanger B by pipeline, its right side outlet is connected to source pump by pipeline, described source pump has two outlets, the outlet of its underpart is connected to the entrance of plate type heat exchanger A by pipeline through little water tank and circulating pump C, and its top outlet is connected to boiler by pipeline; Described boiler has two outlets, and its left side outlet is connected to the entrance of the bottom of source pump by pipeline through circulating pump D, and its right side outlet links to each other with supply-water pump by pipeline; Described boiler also has an entrance, is connected by the outlet of pipeline with plate type heat exchanger B.
The course of work of the present invention comprises four circulations:
First circulation: water cooling pond---circulating pump A---heating equipment---hot-tub---circulating pump B---cooling tower---water cooling pond;
Second circulation: water cooling pond---circulating pump A---heating equipment---hot-tub---variable frequency pump---plate type heat exchanger A---plate type heat exchanger B---water cooling pond;
The 3rd circulation: little water tank---circulating pump C---little water tank of plate type heat exchanger A---source pump---;
The 4th circulation: boiler---circulating pump D---source pump---boiler.
In second circulation, the cooling water of the heating equipment in the hot-tub at first passes through plate type heat exchanger A, by plate type heat exchanger A with the part heat transferred source pump in the cooling water; Cooling water flow can approximately reduce by 3 ℃ through its temperature of plate type heat exchanger A, and the temperature of cooling water is still higher, and cooling water passes through plate type heat exchanger B again, the heat transferred in the cooling water will be injected the normal-temperature water of boiler by plate type heat exchanger B.By plate type heat exchanger B, normal-temperature water is heated to more than 20 ℃ by 10 ℃.Source pump can be heated to 60 ℃ from 20 ℃ with the water in the boiler like this, and needn't be heated to 60 ℃ from 10 ℃.Cooling water passes through plate type heat exchanger A and plate type heat exchanger B successively, energy in the cooling water is carried out cascade utilization, and the temperature of cooling water is reduced to greatest extent, simultaneously the normal-temperature water that enters boiler is carried out preheating, improve the temperature of water to be heated, reduce the consumption of the energy of heating process.
In second circulation, utilize variable frequency pump to supply water to plate type heat exchanger A according to the needs of source pump, even heat source temperature is higher or the temperature fluctuation of thermal source is larger, adopt variable frequency pump to regulate the heat that plate type heat exchanger A transmits, and then guarantee that the water temperature that enters heat pump in the 3rd circulation keeps stable and is lower than 32 ℃, to the requirement of water temperature, and guarantee that heat pump moves efficiently when satisfying operation of heat pump.
Compared with prior art, the present invention has following beneficial effect:
1, the temperature of cooling water is lower usually, directly utilizes plate type heat exchanger that heat is reclaimed, and the heat temperature of recovery can be lower, adds the reduction of temperature in the transmission course, and its available occasion is very limited.The present invention utilizes plate type heat exchanger A that the energy of cooling water is passed to heat pump, then by heat pump the low-temperature heat quantity that the plate type heat exchanger position passes over is converted to high temperature heat, water in the boiler is as the carrier of high temperature heat, its temperature can reach 60 ℃, the occasion that 60 ℃ hot water utilizes in life and industrial production is a lot, it both can be used for bath water, also can be used for the heating in workshop in winter etc.
2, the usually temperature fluctuation of cooling water large (temperature is greater than 32 ℃ sometimes) directly utilizes heat pump (without plate type heat exchanger) that cooling water is reclaimed, and can reduce greatly the service life of heat pump because of the fluctuation of water temperature; When the temperature of cooling water during greater than 32 ℃, the shutdown that heat pump can protectiveness affects the normal operation of waste heat recovery.The present invention utilizes plate type heat exchanger A and variable frequency pump indirect regulation to supply with the heat of heat pump, and the temperature that makes the water that circulates in the 3rd enter the water of heat pump keeps stable, and is lower than 32 ℃, guarantees the service life of heat pump and reliability, the stability of waste heat recovery.
3, normally normal-temperature water is directly injected boiler for the boiler moisturizing, the normal-temperature water temperature of injecting boiler is usually lower, and through the cooling water of the hot-tub of plate type heat exchanger A with part heat transferred heat pump after its temperature still higher.The present invention will inject the normal-temperature water of boiler and pass through first plate type heat exchanger B, absorb the energy of the cooling water of the plate type heat exchanger A that flows through, and temperature obtains raising (its temperature is slightly less than the temperature of cooling water) to a certain degree.Like this normal-temperature water of injecting boiler is carried out preheating, improve the temperature of the normal-temperature water of injecting boiler, both can fall the temperature of cooling water, can make again the water of heat pump boiler, make the water of boiler begin heating from room temperature, and then reduce the consumption of the energy of waste heat recovery process.
Description of drawings
2 in the total accompanying drawing of the present invention, wherein:
Fig. 1 is existing cooling water waste heat recovering system structural representation.
Fig. 2 is cooling water waste heat recovering system structural representation of the present invention.
Among the figure: 1, water cooling pond; 2, circulating pump A; 3, heating equipment; 4, hot-tub; 5, circulating pump B; 6, variable frequency pump; 7, plate type heat exchanger A; 8, circulating pump C; 9, little water tank; 10, source pump; 11, circulating pump D; 12, boiler; 13, supply-water pump; 14, plate type heat exchanger B; 15, cooling tower.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.As shown in Figure 2, a kind of cooling water waste heat recovering system comprises water cooling pond 1, circulating pump A2, heating equipment 3, hot-tub 4, circulating pump B5, variable frequency pump 6, plate type heat exchanger A7, circulating pump C8, little water tank 9, source pump 10, circulating pump D11, boiler 12, supply-water pump 13, plate type heat exchanger B14, cooling tower 15; The outlet of described water cooling pond 1 connects circulating pump A2, heating equipment 3 and hot-tub 4 successively by pipeline; Described hot-tub 4 has two outlets, and the outlet of its top is connected to the entrance of water cooling pond 1 by pipeline through cooling tower 15, and its underpart outlet is connected to the entrance of plate type heat exchanger A7 through variable frequency pump 6 by pipeline; Described plate type heat exchanger A7 has two outlets, its left side outlet is connected to the entrance of water cooling pond 1 through plate type heat exchanger B14 by pipeline, its right side outlet is connected to source pump 10 by pipeline, described source pump 10 has two outlets, the outlet of its underpart is connected to the entrance of plate type heat exchanger A7 by pipeline through little water tank 9 and circulating pump C8, and its top outlet is connected to boiler 12 by pipeline; Described boiler 12 has two outlets, and its left side outlet is connected to the entrance of the bottom of source pump 10 by pipeline through circulating pump D11, and its right side outlet links to each other with supply-water pump 13 by pipeline; Described boiler 12 also has an entrance, is connected by the outlet of pipeline with plate type heat exchanger B14.
The course of work of the present invention comprises four circulations:
First circulation: water cooling pond 1---circulating pump A2---heating equipment 3---hot-tub 4---circulating pump B5---cooling tower 15---water cooling pond 1;
Second circulation: water cooling pond 1---circulating pump A2---heating equipment 3---hot-tub 4---variable frequency pump 6---plate type heat exchanger A7---plate type heat exchanger B14---water cooling pond 1;
The 3rd circulation: little water tank 9---circulating pump C8---little water tank 9 of plate type heat exchanger A7---source pump 10---;
The 4th circulation: boiler 12---circulating pump D11---source pump 10---boiler 12.
In second circulation, the cooling water of the heating equipment 3 in the hot-tub 4 at first passes through plate type heat exchanger A7, by plate type heat exchanger A7 with the part heat transferred source pump 10 in the cooling water; Cooling water flow can approximately reduce by 3 ℃ through its temperature of plate type heat exchanger A7, and the temperature of cooling water is still higher, and cooling water passes through plate type heat exchanger B14 again, the heat transferred in the cooling water will be injected the normal-temperature water of boiler 12 by plate type heat exchanger B14.By plate type heat exchanger B14, normal-temperature water is heated to more than 20 ℃ by 10 ℃.Source pump 10 can be heated to 60 ℃ from 20 ℃ with the water in the boiler 12 like this, and needn't be heated to 60 ℃ from 10 ℃.Cooling water passes through plate type heat exchanger A7 and plate type heat exchanger B14 successively, energy in the cooling water is carried out cascade utilization, the temperature of cooling water is reduced to greatest extent, simultaneously the normal-temperature water that enters boiler 12 is carried out preheating, improve the temperature of water to be heated, reduce the consumption of the energy of heating process.
In second circulation, utilize variable frequency pump 6 to supply water to plate type heat exchanger A7 according to the needs of source pump 10, even heat source temperature is higher or the temperature fluctuation of thermal source is larger, adopt variable frequency pump 6 to regulate the heat that plate type heat exchanger A7 transmits, and then guarantee that the water temperature that enters heat pump in the 3rd circulation keeps stable and is lower than 32 ℃, to the requirement of water temperature, and guarantee that heat pump moves efficiently when satisfying operation of heat pump.
Claims (1)
1. cooling water waste heat recovering system, comprise water cooling pond (1), circulating pump A(2), heating equipment (3), hot-tub (4), circulating pump B(5), variable frequency pump (6), plate type heat exchanger A(7), circulating pump C(8), boiler (12), supply-water pump (13) and cooling tower (15), it is characterized in that: also comprise little water tank (9), source pump (10), circulating pump D(11) and plate type heat exchanger B(14); The outlet of described water cooling pond (1) connects circulating pump A(2 successively by pipeline), heating equipment (3) and hot-tub (4); Described hot-tub (4) has two outlets, and the outlet of its top is connected to the entrance of water cooling pond (1) by pipeline through cooling tower (15), and its underpart outlet is connected to plate type heat exchanger A(7 by pipeline through variable frequency pump (6)) entrance; Described plate type heat exchanger A(7) two outlets is arranged, its left side outlet by pipeline through plate type heat exchanger B(14) be connected to the entrance of water cooling pond (1), its right side outlet is connected to source pump (10) by pipeline, described source pump (10) has two outlets, the outlet of its underpart by pipeline through little water tank (9) and circulating pump C(8) be connected to plate type heat exchanger A(7) and entrance, its top outlet is connected to boiler (12) by pipeline; Described boiler (12) has two outlets, its left side outlet by pipeline through circulating pump D(11) be connected to the entrance of the bottom of source pump (10), its right side outlet links to each other with supply-water pump (13) by pipeline; Described boiler (12) also has an entrance, by pipeline and plate type heat exchanger B(14) outlet be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210438692.9A CN102914085B (en) | 2012-11-06 | 2012-11-06 | Cooling water waste heat recycling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210438692.9A CN102914085B (en) | 2012-11-06 | 2012-11-06 | Cooling water waste heat recycling system |
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| CN102914085A true CN102914085A (en) | 2013-02-06 |
| CN102914085B CN102914085B (en) | 2014-08-27 |
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Cited By (6)
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| CN103234305A (en) * | 2013-05-07 | 2013-08-07 | 杨家华 | Heat energy circulating unit |
| CN103398414A (en) * | 2013-07-17 | 2013-11-20 | 大连兆和科技发展有限公司 | Industrial cooling water waste heat recycling system |
| CN105576943A (en) * | 2014-10-13 | 2016-05-11 | 国家电网公司 | High-voltage DC converter valve heat recycling system and realizing method thereof |
| CN106338159A (en) * | 2016-10-14 | 2017-01-18 | 深圳万发创新进出口贸易有限公司 | Cooling water waste heat recovery system |
| CN109186300A (en) * | 2018-08-17 | 2019-01-11 | 山东禹王生态食业有限公司 | A kind of afterheat utilizing system |
| CN115517326A (en) * | 2022-08-15 | 2022-12-27 | 杭州娃哈哈精密机械有限公司 | Energy-saving multistage formula tunnel sprays sterilization system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234305A (en) * | 2013-05-07 | 2013-08-07 | 杨家华 | Heat energy circulating unit |
| CN103398414A (en) * | 2013-07-17 | 2013-11-20 | 大连兆和科技发展有限公司 | Industrial cooling water waste heat recycling system |
| CN105576943A (en) * | 2014-10-13 | 2016-05-11 | 国家电网公司 | High-voltage DC converter valve heat recycling system and realizing method thereof |
| CN105576943B (en) * | 2014-10-13 | 2018-08-28 | 国家电网公司 | A kind of high voltage direct current converter valve heat recovery system and its implementation |
| CN106338159A (en) * | 2016-10-14 | 2017-01-18 | 深圳万发创新进出口贸易有限公司 | Cooling water waste heat recovery system |
| CN109186300A (en) * | 2018-08-17 | 2019-01-11 | 山东禹王生态食业有限公司 | A kind of afterheat utilizing system |
| CN109186300B (en) * | 2018-08-17 | 2020-01-10 | 山东禹王生态食业有限公司 | Waste heat utilization system |
| CN115517326A (en) * | 2022-08-15 | 2022-12-27 | 杭州娃哈哈精密机械有限公司 | Energy-saving multistage formula tunnel sprays sterilization system |
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| CN102914085B (en) | 2014-08-27 |
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