CN105588160A - Central heating system enabling primary return water to be reutilized - Google Patents
Central heating system enabling primary return water to be reutilized Download PDFInfo
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- CN105588160A CN105588160A CN201410562033.5A CN201410562033A CN105588160A CN 105588160 A CN105588160 A CN 105588160A CN 201410562033 A CN201410562033 A CN 201410562033A CN 105588160 A CN105588160 A CN 105588160A
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Abstract
The invention provides a central heating system enabling primary return water to be reutilized. The central heating system comprises a user side, a heat exchange station, an opening small chamber, a primary net water supply pipe and a primary net return water pipe. The user side is sequentially connected to the heat exchange station and the opening small chamber. The primary net water supply pipe and the primary net return water pipe penetrate the opening small chamber. The heat exchange station comprises a heat exchange device, a first frequency conversion pressure pump and a second frequency conversion pressure pump. The heat exchange device is connected with the first frequency conversion pressure pump. A primary inlet of the heat exchange station is additionally provided with the second frequency conversion pressure pump. A three-pipe system is arranged on the opening small chamber. An adjusting value is additionally arranged behind a water supply valve, and a 90-degree elbow is additionally arranged at a newly-opened pipe opening. The temperature of return water is low, the supply and return temperature difference is large, the conveying capability of the central heating system is improved by 25% or above, the central heating efficiency of the heating system is improved, and the heat energy is sufficiently utilized; and meanwhile energy saving and environment friendliness are achieved, cost is saved, the project period is short, and a very important practical significance is achieved.
Description
Technical field
The present invention relates to central heating system, be specifically related to a kind of central heating system that makes primary water recycling.
Background technology
In " Chinese cogeneration of heat and power industry market prediction and the report of investment strategy planning application ", point out, by 2015, China's cogeneration of heat and power installation scale will reach 2.5 hundred million kilowatts, and heating power has reached 1.25 hundred million kilowatts, and Areas benefiting from central heating will reach 10,000,000,000 square meters. In prior art as shown in Figure 2, there is following defect in central heating system: (1) opening cell is Double tube, after former water supply valve, there is no control valve, and can not realize primary water becomes thermal source, for the water regulating valve interior control of not stood; (2) entrance of heat exchange station does not fill frequency conversion force (forcing) pump; (3) open pipe mouth does not add 90 ° of elbows, has microcirculation to produce; (4) plate type heat exchanger, a secondary side flow velocity is asymmetric, has reduced heat exchange efficiency. In sum, central heating system practical operation situation in prior art, supply water temperature is generally 120 DEG C of left and right, return water temperature is 55-60 DEG C of left and right, and the even arrival having is more than 70 DEG C, and return water temperature is high, supply back to have a narrow range of temperature, conveying capacity is limited, and system central heating efficiency is low, and heat energy can not make full use of.
Summary of the invention
The invention provides a kind of central heating system that makes primary water recycling, overcome prior art return water temperature high, supply back to have a narrow range of temperature, conveying capacity is limited, and system central heating efficiency is low, and heat energy can not make full use of, the defect of not energy-conserving and environment-protective.
The present invention adopts following technical scheme:
A kind of central heating system that makes primary water recycling, comprise user, heat exchange station, opening cell, a secondary net feed pipe and a secondary net return pipe, described user is connected in heat exchange station and opening cell successively, one secondary net feed pipe and a secondary net return pipe are through opening cell, described heat exchange station comprises heat transmission equipment, frequency conversion force (forcing) pump one and frequency conversion force (forcing) pump two, described heat transmission equipment connects frequency conversion force (forcing) pump one, and entrance of described heat exchange station installs frequency conversion force (forcing) pump two additional; Described opening cell arranges three control, installs control valve after water supply valve additional, only needs simple primary water opening, and just can realize primary water is thermal source, for control in water regulating valve station; Add 90 ° of elbows at new open pipe mouth, to pull open new interface and former water return outlet pressure reduction, avoid microcirculation to produce.
Described frequency conversion force (forcing) pump one and frequency conversion force (forcing) pump two pump selection principles are, overcome plate type heat exchanger and branch line on-way resistance, regulate pump head, make pressure reduction between return pipe two openings be not more than 1 meter water column, to guarantee that large net hydraulic regime is not affected by force (forcing) pump.
Described heat transmission equipment is full-welding plate-type heat exchanger or symmetrical detachable plate type heat exchanger, and the present invention starts with from adjusting a secondary side flow velocity, from actual operating mode, optimizes plate type heat exchanger design and operation, thereby has greatly improved the efficiency of plate type heat exchanger. The present invention optimizes plate type heat exchanger following scheme:
Scheme 1: all use primary water, select full-welding plate-type heat exchanger.
Design condition: primary side confession/return water temperature T1=60℃，T2=41 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=40℃，t2=55 DEG C; Secondary side pressure of supply water P=2.0Mpa;
Thermic load Q=2500KW;
Scheme 2: all use primary water, select symmetrical detachable plate type heat exchanger.
Design condition: primary side confession/return water temperature T1=60℃，T2=51 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=50℃，t2=58 DEG C; Secondary side pressure of supply water P=2.0Mpa;
Thermic load Q=2500KW;
Scheme 3: use temperature as thermal source, is selected symmetrical detachable plate type heat exchanger heat exchange after 55-60 DEG C of primary water mixes with a high-grade hot water. This programme flow process and option A, B are identical, are also option A, B additional project, and in the time that primary water flow can not meet secondary water-supply temperature requirement, thermal source adopts primary water blending high-grade once to supply water;
Design condition: primary side confession/return water temperature T1=60℃，T2=41 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=40℃，t2=55 DEG C; Secondary side pressure of supply water P=2.0Mpa;
Thermic load Q=2500KW;
The blending design condition after (flow is 7.62t/h) that once supplies water: primary side confession/return water temperature T1=65℃，T2=41 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=40℃,t2=60 DEG C; Secondary side pressure of supply water P=2.0Mpa. Wherein, water supply flow 7.62t/h of blending, is normal for 15% of heat flow, and the blending heat that once supplies water accounts for total load 28%.
Above three schemes, all can meet and reduce primary water temperature, the requirement that improves central heating system conveying capacity. Three schemes should consider utilization according to actual conditions, because user's character, locus and the heat exchanger proterties etc. of the system of each thermal substation are different, so before thermal substation technological transformation, design targetedly.
Control principle of the present invention is: using secondary heating leaving water temperature as the control point of controlling primary side pump capacity, in the time that primary side flow reaches metered flow, still can not meet secondary leaving water temperature time, system is automatically enabled a high-order thermal source and is supplemented, and does not need automatically to close while supplementing.
Beneficial effect of the present invention is:
The present invention is by technological transformation, primary water (55 ~ 60 DEG C) is again utilized in heat exchange station, its temperature can be down to 40 DEG C of left and right, bring up to 75 DEG C of left and right by central heating system supply backwater temperature difference, return water temperature is low, poor large for rising again, the conveying capacity of central heating system has been improved more than 25%. Improve for system central heating efficiency, heat energy is made full use of, energy-conserving and environment-protective simultaneously, cost-saving, construction period is short, has very important realistic meaning.
Brief description of the drawings
Fig. 1 makes the central heating system structural representation of primary water recycling described in being;
Fig. 2 is prior art central heating system structure structural representation.
Description of reference numerals
1 user; 2 heat exchange stations; 21 heat transmission equipments; 22 frequency conversion force (forcing) pumps one; 23 frequency conversion force (forcing) pumps two; 3 opening cells; 31 control valves; 4 one secondary net feed pipes; 5 one secondary net return pipes; 6 users one; 7 heat transmission equipments one; 8 one secondary net feed pipes one; 9 one secondary net return pipes one; 10 frequency conversion force (forcing) pumps three.
Detailed description of the invention
Further illustrate the present invention below in conjunction with accompanying drawing and embodiments of the invention.
Embodiment 1
As shown in Figure 1, a kind of central heating system that makes primary water recycling, comprise user 1, heat exchange station 2, opening cell 3, one secondary net feed pipe 4 and a secondary net return pipe 5, described user 1 is connected in heat exchange station 2 and opening cell 3 successively, one secondary net feed pipe 4 and a secondary net return pipe 5 are through opening cell 3, described heat exchange station 2 comprises heat transmission equipment 21, frequency conversion force (forcing) pump 1 and frequency conversion force (forcing) pump 2 23, described heat transmission equipment 21 connects frequency conversion force (forcing) pump 1, and 2 entrances of described heat exchange station install frequency conversion force (forcing) pump 2 23 additional; Described opening cell 3 arranges three control, installs control valve 31 after water supply valve additional, only needs simple primary water opening, and just can realize primary water is thermal source, the control valve 31 interior control of being stood; And adding 90 ° of elbows at new open pipe mouth, to pull open new interface and former water return outlet pressure reduction, avoid microcirculation to produce.
Described frequency conversion force (forcing) pump 1 and frequency conversion force (forcing) pump 2 23 selection principles are, only overcome plate type heat exchanger and branch line on-way resistance, regulate pump head, make pressure reduction between return pipe two openings be not more than 1 meter water column, to guarantee that large net hydraulic regime is not affected by force (forcing) pump.
Described heat transmission equipment 21 is full-welding plate-type heat exchanger or symmetrical detachable plate type heat exchanger, the present invention starts with from adjusting a secondary side flow velocity, from actual operating mode, optimize plate type heat exchanger design and operation, thereby greatly improve the efficiency of plate type heat exchanger, optimized plate type heat exchanger design and operation scheme as follows:
All use primary water, select full-welding plate-type heat exchanger.
Design condition: primary side confession/return water temperature T1=60℃，T2=41 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=40℃，t2=55 DEG C; Secondary side pressure of supply water P=2.0Mpa;
Thermic load Q=2500KW.
Embodiment 2
As shown in Figure 1, a kind of central heating system that makes primary water recycling, comprise user 1, heat exchange station 2, opening cell 3, one secondary net feed pipe 4 and a secondary net return pipe 5, described user 1 is connected in heat exchange station 2 and opening cell 3 successively, one secondary net feed pipe 4 and a secondary net return pipe 5 are through opening cell 3, described heat exchange station 2 comprises heat transmission equipment 21, frequency conversion force (forcing) pump 1 and frequency conversion force (forcing) pump 2 23, described heat transmission equipment 21 connects frequency conversion force (forcing) pump 1, and 2 entrances of described heat exchange station install frequency conversion force (forcing) pump 2 23 additional; Described opening cell 3 arranges three control, installs control valve 31 after water supply valve additional, only needs simple primary water opening, and just can realize primary water is thermal source, the control valve 31 interior control of being stood; And adding 90 ° of elbows at new open pipe mouth, to pull open new interface and former water return outlet pressure reduction, avoid microcirculation to produce.
Described frequency conversion force (forcing) pump 1 and frequency conversion force (forcing) pump 2 23 selection principles are, only overcome plate type heat exchanger and branch line on-way resistance, regulate pump head, ensure that between return pipe two openings, pressure reduction is not more than 1 meter water column, to guarantee that large net hydraulic regime is not affected by force (forcing) pump.
Described heat transmission equipment 21 is full-welding plate-type heat exchanger or symmetrical detachable plate type heat exchanger, the present invention starts with from adjusting a secondary side flow velocity, from actual operating mode, optimize plate type heat exchanger design and operation, thereby greatly improve the efficiency of plate type heat exchanger, optimized plate type heat exchanger design and operation scheme as follows:
All use primary water, select symmetrical detachable plate type heat exchanger
Design condition: primary side confession/return water temperature T1=60℃，T2=51 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=50℃，t2=58 DEG C; Secondary side pressure of supply water P=2.0Mpa;
Thermic load Q=2500KW;
Embodiment 3
As shown in Figure 1, a kind of central heating system that makes primary water recycling, comprise user 1, heat exchange station 2, opening cell 3, one secondary net feed pipe 4 and a secondary net return pipe 5, described user 1 is connected in heat exchange station 2 and opening cell 3 successively, one secondary net feed pipe 4 and a secondary net return pipe 5 are through opening cell 3, described heat exchange station 2 comprises heat transmission equipment 21, frequency conversion force (forcing) pump 1 and frequency conversion force (forcing) pump 2 23, described heat transmission equipment 21 connects frequency conversion force (forcing) pump 1, and 2 entrances of described heat exchange station install frequency conversion force (forcing) pump 2 23 additional; Described opening cell 3 arranges three control, installs control valve 31 after water supply valve additional, only needs simple primary water opening, and just can realize primary water is thermal source, the control valve 31 interior control of being stood; And adding 90 ° of elbows at new open pipe mouth, to pull open new interface and former water return outlet pressure reduction, avoid microcirculation to produce.
Described frequency conversion force (forcing) pump 1 and frequency conversion force (forcing) pump 2 23 selection principles are, only overcome plate type heat exchanger and branch line on-way resistance, regulate pump head, make pressure reduction between return pipe two openings be not more than 1 meter water column, to guarantee that large net hydraulic regime is not affected by force (forcing) pump.
Described heat transmission equipment 21 is full-welding plate-type heat exchanger or symmetrical detachable plate type heat exchanger, the present invention starts with from adjusting a secondary side flow velocity, from actual operating mode, optimize plate type heat exchanger design and operation, thereby greatly improve the efficiency of plate type heat exchanger, optimized plate type heat exchanger design and operation scheme as follows:
With temperature after 55-60 DEG C of primary water mixes with a high-grade hot water as thermal source, select symmetrical detachable plate type heat exchanger heat exchange. This programme flow process and option A, B are identical, are also option A, B additional project, and in the time that primary water flow can not meet secondary water-supply temperature requirement, thermal source adopts primary water blending high-grade once to supply water.
Design condition: primary side confession/return water temperature T1=60℃，T2=41 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=40℃，t2=55 DEG C; Secondary side pressure of supply water P=2.0Mpa;
Thermic load Q=2500KW.
The blending design condition after (flow is 7.62t/h) that once supplies water: primary side confession/return water temperature T1=65℃，T2=41 DEG C; Primary side pressure of supply water P=2.0Mpa; Secondary side confession/return water temperature t1=40℃,t2=60 DEG C; Secondary side pressure of supply water P=2.0Mpa. Wherein, water supply flow 7.62t/h of blending, is normal for 15% of heat flow, and the blending heat that once supplies water accounts for total load 28%.
Above three schemes, all can meet and reduce primary water temperature, the requirement that improves central heating system conveying capacity, and three schemes should consider utilization according to actual conditions. Due to the system of each thermal substation, user's character, locus, heat exchanger proterties etc. are different, so before thermal substation technological transformation, design targetedly.
The present invention is by technological transformation, primary water (55 ~ 60 DEG C) is again utilized in heat exchange station, its temperature can be down to 40 DEG C of left and right, bring up to 75 DEG C of left and right by central heating system supply backwater temperature difference, return water temperature is low, poor large for rising again, the conveying capacity of central heating system has been improved more than 25%. Improve for system central heating efficiency, heat energy is made full use of, energy-conserving and environment-protective simultaneously, cost-saving, construction period is short, has very important realistic meaning.
The above, be only preferred embodiment of the present invention, therefore can not limit according to this scope of the invention process, the equivalence of doing according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope of lid of the present invention.
Claims (3)
1. one kind makes the central heating system of primary water recycling, comprise user, heat exchange station, opening cell, a secondary net feed pipe and a secondary net return pipe, described user is connected in heat exchange station and opening cell successively, one secondary net feed pipe and a secondary net return pipe are through opening cell, it is characterized in that: described heat exchange station comprises heat transmission equipment, frequency conversion force (forcing) pump one and frequency conversion force (forcing) pump two, described heat transmission equipment connects frequency conversion force (forcing) pump one, and entrance of described heat exchange station installs frequency conversion force (forcing) pump two additional; Described opening cell arranges three control, installs control valve after water supply valve additional, and is adding 90 ° of elbows at new open pipe mouth.
2. the central heating system that makes primary water recycling according to claim 1, is characterized in that: described frequency conversion force (forcing) pump one and frequency conversion force (forcing) pump two make pressure reduction between water pipe two openings be not more than 1 meter water column.
3. the central heating system that makes primary water recycling according to claim 1, is characterized in that: described heat transmission equipment is full-welding plate-type heat exchanger or symmetrical detachable plate type heat exchanger.
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| CN201410562033.5A CN105588160A (en) | 2014-10-21 | 2014-10-21 | Central heating system enabling primary return water to be reutilized |
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| CN201410562033.5A CN105588160A (en) | 2014-10-21 | 2014-10-21 | Central heating system enabling primary return water to be reutilized |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106875065A (en) * | 2017-02-24 | 2017-06-20 | 哈尔滨工业大学 | A kind of heat exchange station operation method for reducing once net return water temperature |
| CN107152709A (en) * | 2016-12-02 | 2017-09-12 | 天津市津安热电有限公司 | A kind of efficient cascade utilization heating system that water is mixed with once net backwater |
| CN108444010A (en) * | 2018-04-04 | 2018-08-24 | 李社红 | A kind of three control central air conditioning water systems of energy cascade utilization |
| CN112268310A (en) * | 2020-10-22 | 2021-01-26 | 北京市热力集团有限责任公司 | Novel heating system for heating by utilizing return water of cogeneration heat supply network |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112268310A (en) * | 2020-10-22 | 2021-01-26 | 北京市热力集团有限责任公司 | Novel heating system for heating by utilizing return water of cogeneration heat supply network |
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