CN114110714A - Low-pressure cylinder low-flow working condition waste heat deep recovery heat supply system and application method thereof - Google Patents
Low-pressure cylinder low-flow working condition waste heat deep recovery heat supply system and application method thereof Download PDFInfo
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- 239000002918 waste heat Substances 0.000 title claims abstract description 33
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims description 33
- 239000000498 cooling water Substances 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 9
- 230000009466 transformation Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/126—Absorption type heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
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Abstract
The invention discloses a low-pressure cylinder small-flow working condition waste heat deep recovery heating system and an application method thereof. The system is suitable for low-pressure cylinder low-flow operation units with deep peak regulation requirements in northern areas of China. The system can deeply recover the low-grade waste heat of the low-pressure cylinder small-flow operation unit which operates under the low-pressure cylinder small-flow working condition, is used for heating the circulating water of the heat supply network, realizes the optimization of the heat supply operation flow of the unit, and further furthest excavates the heat supply potential and the heat supply economical efficiency of the unit.
Description
Technical Field
The invention belongs to the technical field of high-efficiency cogeneration of thermal generator sets, and particularly relates to a low-pressure cylinder small-flow working condition waste heat deep recovery heating system and an application method thereof.
Background
The real-time low pressure optical axis heat supply of a plurality of power plants has been reformed transform in domestic, through change low pressure pure rotor for the low pressure optical axis in order to realize winter back pressure formula heat supply operation before the heat supply period begins, has showing stand-alone heat supply ability and heat supply stability of having promoted.
On the basis of the low-pressure optical axis heat supply technology, a more flexible low-pressure cylinder zero-output heat supply mode is developed domestically. At present, the domestic residual 150 MW-600 MW-grade unit implements low-pressure cylinder zero-output heat supply (also called cylinder-cutting heat supply) reconstruction, and further obviously improves the heat supply operation flexibility and the economical efficiency of the unit.
No matter the extraction condensing operation of a large amount of heat supply extraction steam, the zero-output heat supply operation of the low-pressure cylinder or the low-pressure optical axis heat supply operation, the unit needs to keep the low-pressure cylinder in a small flow state to avoid the over-temperature of the low-pressure cylinder and cause the loss of a large amount of cold sources of the unit, taking a typical 300 MW-grade unit as an example, the exhaust steam quantity of the low-pressure cylinder during the zero-output operation can reach more than 65t/h (the cooling steam flow of the low-pressure cylinder is 20t/h, the exhaust steam flow of a water feeding pump steam turbine can reach 45t/h), and the exhaust steam quantity of the low-pressure cylinder during the extraction condensing operation can reach more than 150 t/h. Therefore, in the heat supply period, although the running economy of the unit is greatly improved through cogeneration, a large amount of low-pressure exhaust steam waste heat cannot be fully utilized, and a large energy-saving submersible space exists.
In the current double-carbon background, deep energy-saving potential excavation is a necessary requirement for the existing heat supply technology. Although the cogeneration technology of large thermal power generating units in colleges and universities has gradually become the preferred technical route for central heating of residents in northern areas, the heat economy and the peak regulation capability of the large thermal power generating units still need to be further improved and perfected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-pressure cylinder low-flow working condition waste heat deep recovery heating system and an application method thereof so as to solve the problem that low-pressure exhaust steam preheating in the prior art cannot be fully utilized. The invention aims at the operating modes of a large amount of heat supply and steam extraction such as extraction condensation operation, low-pressure cylinder zero-output heat supply operation or low-pressure optical axis heat supply operation and the like which are developed vigorously at present, and develops a technology capable of realizing high-efficiency and flexible recovery of low-grade waste heat in a matching way, and aims to realize deep recovery of low-pressure steam exhaust waste heat through optimization and improvement of a thermal process of a unit, obviously improve the heat supply economical efficiency of the unit and simultaneously realize combined improvement of the heat supply capacity and the peak regulation capacity of the unit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a low-pressure cylinder low-flow working condition waste heat deep recovery heat supply system comprises a condenser, a heat pump set and a heat supply network head station;
the water outlet end of the condenser is connected with a condenser circulating water outlet pipeline, and the condenser cooling water outlet pipeline is connected to a cooling tower;
the condenser circulating water outlet pipeline is provided with a branch which is a low-level heat source water inlet pipeline, the low-level heat source water inlet pipeline is connected with a heat source inlet of the heat pump group, a heat source outlet of the heat pump group is connected with a low-level heat source water return pipeline, and the low-level heat source water return pipeline is converged into the condenser circulating water outlet pipeline;
a cold source inlet of the heat pump set is connected with a heat supply network water return pipeline, a cold source outlet of the heat pump set is connected with a heat supply network initial station through a circulating water pipeline, and a water outlet end of the heat supply network initial station is connected with user water;
the condenser is used for cooling the exhaust steam of the low-pressure cylinder low-flow operation unit.
The invention is further improved in that:
preferably, a first valve is arranged on the condenser circulating water outlet pipeline, and the first valve is connected with the heat pump unit in parallel.
Preferably, a fourth valve is arranged on the water inlet pipeline of the low-condensing-level heat source.
Preferably, a second valve is arranged on the heat supply network water return pipeline, and a third valve is arranged on the circulating water pipeline.
Preferably, the heat pump set is composed of voltage-compression heat pumps connected in parallel.
Preferably, the heat pump unit is formed by connecting absorption heat pumps in parallel.
Preferably, the cooling tower is provided with a roller blind.
Preferably, the heating steam of the low-pressure cylinder low-flow operation unit is connected to a heat supply network initial station.
According to the application method of the low-pressure cylinder low-flow working condition waste heat deep recovery heat supply system, return water of a heat supply network is heated for the first time in a heat pump unit and then flows into a first station of the heat supply network for secondary temperature rise;
and cooling water absorbing heat in the condenser is used as a low-level heat source to release heat in the heat pump unit, and the cooled cooling water flows back to the cooling tower.
Preferably, the cooled cooling water enters the cooling tower when the temperature is more than or equal to 22 ℃, otherwise, the cooled cooling water enters a water pool of the cooling tower.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a low-pressure cylinder small-flow working condition waste heat deep recovery optimization system which inputs cooling water of a condenser into a heat pump unit so that the cooling water absorbing the heat of dead steam can release heat in the heat pump unit again. The system is suitable for low-pressure cylinder small-flow operation units with deep peak regulation requirements in northern areas, can deeply recover zero-output heat supply of the low-pressure cylinder, low-pressure optical axis heat supply and low-grade waste heat generated in large-scale heat supply and steam extraction operation of the extraction condensing unit, is used for heating circulating water of a heat supply network, realizes optimization of heat supply operation flow of the units, and accordingly furthest excavates heat supply potential and heat supply economical efficiency of the units, and has remarkable economic benefits and environmental protection benefits. The system has higher operation flexibility, each heat pump can be switched freely, the unit can determine the water quantity of the upper tower and the opening and closing of the air port roller shutter of the cooling tower according to the conditions of waste heat recovery and water temperature of the cooling tower pool, and the two operation are independent and reliable.
Furthermore, a connecting branch is arranged, so that when the heat pump system cannot absorb all the heat of the low-level heat source or the system is withdrawn, part or all of the cooling water can directly flow back to the cooling tower.
Furthermore, valves are arranged on the condenser cooling water outlet pipeline and the water inlet end and the water outlet end of the circulating water pipeline, so that the waste heat recovery system can be used and stopped.
Furthermore, the cooling tower is provided with a roller shutter, and when the waste heat recovery system is put into operation in low-temperature weather, the roller shutter correspondingly shields the air inlet of the cooling tower, so that the anti-freezing protection of the cooling tower is realized.
The invention also discloses a low-pressure cylinder small-flow working condition waste heat deep recovery optimized heating method, aiming at the low-flow operation working condition of the low-pressure cylinder of the large-scale cogeneration unit in the heating period, the method can deeply recover the low-grade waste heat of the low-pressure cylinder small-flow operation unit of the heating unit for supplying heat and extracting steam in large quantities, such as extraction condensation operation, low-pressure cylinder zero-output heating operation or low-pressure optical axis heating operation, and the like, and is used for heating the circulating water of a heat network to realize the optimization of the heating operation flow of the unit, thereby furthest excavating the heating potential and the heating economy of the unit. The method can be widely applied to a condensing unit, a low-pressure cylinder zero-output heat supply unit and a low-pressure optical axis heat supply unit for large-flow heat supply and steam extraction.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
wherein: 1-low-pressure cylinder small-flow operation unit; 2-heat supply network initial station; 3-heat pump group; 4-a condenser; 5-a cooling tower; 6-a circulating water outlet pipeline of the condenser; 7-a heat supply network water return pipeline; 8-a first valve; 9-a low-level heat source water inlet pipeline; 10-a circulating water pipeline; 11-a low-level heat source water return pipeline; 12-a second valve; 13-a third valve; 14-fourth valve
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention combines the development of a heat supply unit which operates under the low-flow working condition of a low-pressure cylinder, couples a water source electric heating pump with a unit cold end system, thereby realizing the purpose of introducing circulating cooling water at the outlet of a condenser of the unit into the electric heating pump and partially or completely recovering low-grade waste heat. Meanwhile, in order to ensure safe and economic operation of the main engine and the auxiliary engine of the unit, the following adaptive optimization measures are also required to be implemented together: the method comprises the steps of circulating cooling water feeding tower interlocking control, circulating water pump speed regulation transformation and cooling tower anti-freezing transformation.
Referring to the attached drawing 1, the deep waste heat recovery and heat supply system comprises a low-pressure cylinder low-flow operation unit 1, a heat supply network initial station 2, a heat pump unit 3, a condenser 4 and a cooling tower 5.
The hot steam of the low-pressure cylinder low-flow operation unit 1 is output to the heat supply network head station 2, and the heat supply network head station 2 supplies the heated water to users.
The exhaust steam of the low-pressure cylinder low-flow operation unit 1 is connected to a condenser 4 and is cooled in the condenser 4. And a condenser circulating water outlet pipeline 6 of the condenser 4 is communicated with the cooling tower 5.
The condenser circulating water outlet pipeline 6 is provided with a branch which is a low-level heat source water inlet pipeline 9, the low-level heat source water inlet pipeline 9 is connected to the heat pump group 3, and after heat is released in the heat pump group 3, the heat is converged into the condenser circulating water pipeline 6 through a low-level heat source water return pipeline 11 and flows back to the cooling tower 5. And a first valve 8 is arranged on the condenser circulating water outlet pipeline 6, and the first valve 8 is connected with the heat pump unit 3 in parallel. When the heat pump unit 3 can completely absorb the heat of the low-level heat source, the first valve 8 is closed, and all the circulating water flowing out of the condenser enters the heat pump unit; when the heat pump unit 3 cannot completely absorb the heat of the low-level heat source, the first valve 8 is opened, part of circulating water flowing out of the condenser enters the heat pump unit, and part of the circulating water directly flows back to the cooling tower.
As one of the preferable schemes, the heat pump unit 3 is composed of a plurality of voltage compression pumps or a plurality of absorption heat pumps. And returning water entering the cooling tower 5 from a circulating water outlet pipeline of the condenser, entering the cooling tower if the temperature of the returning water reaches 22 ℃, or directly entering a water tank of the cooling tower 5. The heat pump set 3 is also connected with a circulating water pipeline 10, the water inlet end of the circulating water pipeline 10 is connected with a heat supply network water return pipeline 7, and the water outlet end of the circulating water pipeline 10 of the heat pump set 3 is connected with the heat supply network initial station 2.
Furthermore, the low-pressure cylinder low-flow operation heat supply unit has higher vacuum requirement, generally maintains the exhaust back pressure of about 4kPa, and the circulating cooling water enters 20 ℃ and the outlet water is generally about 25 ℃. For the low-grade waste heat at the temperature level, a heat pump is adopted as a relatively efficient method at present. According to different operation principles, a voltage compression heat pump or an absorption heat pump can be adopted. The voltage-compression heat pump has the advantages that the energy efficiency ratio (COP) is high, the COP value can be stably maintained at about 4-5 when the load of the unit fluctuates, the operation flexibility is good, the peak shaving depth of the unit can be improved, and the auxiliary frequency modulation can be realized through the power consumption control of the voltage-compression heat pump. The absorption heat pump has the advantages of low power consumption and high heat economy, but has the disadvantages of low energy efficiency, the need of extracting a large amount of driving steam, the COP value of the design working condition can reach about 1.7, the COP value of the unit under low load working condition (the pressure of the middle exhaust steam is obviously reduced) can be reduced to below 1.2, and the adaptability of the absorption heat pump to the frequent peak regulation unit is inferior to that of a voltage compression heat pump.
Therefore, for the areas requiring frequent peak shaving, in order to ensure that the operation flexibility of the unit is not reduced, the voltage compression heat pump is recommended to be preferentially selected, so that the deep recovery of the waste heat of the low-pressure cylinder low-flow operation unit can be realized, and the peak shaving and frequency modulation capabilities of the unit can be further improved.
When electing the electric compression heat pump, a plurality of electric compression heat pumps are connected with a high-voltage power supply together, and corresponding transformers and switch cabinets are arranged on the connecting pipelines.
A fourth valve 14 is arranged on the low-level heat source water inlet pipeline 9, a second valve 12 is arranged on the heat supply network water return pipeline 7, and a third valve 13 is arranged on the circulating water pipeline 10. When the system is not used in the heating season, the three valves are closed together. In the heating season, the contact parties before the second valve 12 and after the third valve 13 can be closed completely, otherwise, only the fourth valve 6 can be closed, so that the circulating water of the heat supply network can enter the heat supply network initial station 2.
The cooling tower 5 is additionally provided with anti-freezing measures, and is particularly additionally provided with a roller shutter device. And in low-temperature weather, the air inlet of the cooling tower is shielded by the roller shutter, so that the anti-freezing protection of the cooling tower is realized.
The working principle of the system transformation is as follows:
1) and (5) modifying a heat pump circulating water system. And (3) respectively introducing 4 voltage-compression pump sets into circulating water of a heat supply network at 50 ℃ of about 5090t/h as circulating water of a heat pump, and introducing the circulating water of the heat supply network to the first station of the heat supply network for secondary temperature increase after heating and temperature increase to 60 ℃. 2) And (5) transforming a low-level heat source of the heat pump. A bypass and a corresponding valve group are additionally arranged on a unit circulating cooling water pipeline, high-temperature circulating cooling water (25 ℃) is connected to a voltage compression type pump group and used as a low-level heat source of a heat pump group 3, and the high-temperature circulating cooling water returns to a cooling tower water pool after heat exchange and cooling. 3) And (5) transforming a heat pump driving power supply. A12 MW high-voltage power supply, a corresponding transformer, a switch cabinet and the like are additionally arranged for the voltage-reduction pump set.
Examples
The invention is described by taking a typical 300MW level low-pressure cylinder zero-output low-pressure cylinder small-flow operation unit as an example. Table 1 gives the overall design boundaries.
Table 1 project design boundary parameters
(1) Selection of low-temperature waste heat recovery equipment
(2) Thermodynamic parameter calculation
According to the boundary conditions of the typical 300MW unit, the model selection calculation is carried out according to the voltage compression type heat pump, and the details are shown in the following table. From the model selection calculation results, under the condition that the water inlet temperature of the heat pump condenser is the same, if the required water outlet temperature is lower, the corresponding energy efficiency ratio is relatively higher, and the economical efficiency is good. However, if the temperature rise is too low, the required circulating water amount of the heat supply network is too large, and the investment of pipelines and valves is greatly increased. In combination with the practical situation of general engineering, the temperature rise is 10 ℃, namely the temperature of the circulating water of the heat pump outlet heat supply network is 60 ℃.
TABLE 2 selection of voltage-compression heat pumps
The gains after the above modifications are shown in table 3 below:
TABLE 3 retrofit benefits
The invention is suitable for the low-grade waste heat deep recovery of low-flow working conditions (including low-pressure cylinder zero-output heat supply, low-pressure optical axis heat supply, large-flow extraction and condensation heat supply and the like) of low-pressure cylinders of all cogeneration units, and has remarkable economic benefit and environmental protection benefit, and the benefits obtained by the embodiment are as follows:
1) after the transformation is finished, the single-machine heat supply capacity can be improved by 59.2MW according to 40W/m2The heat supply index estimation can increase the central heat supply area of 148 ten thousand square meters.
2) After the transformation is finished, according to the difference of the system input operation time, the coal standard is saved by 1.05-2.1 ten thousand tons in a conservative estimation year, and the emission of carbon dioxide is reduced by 2.6-5.3 ten thousand tons in a year.
3) According to different heat supply operation time lengths of units in different areas of China, the annual economic benefit is conservatively estimated to be 1051-2102 ten thousand yuan. And all investment can be recovered 2-3 years after the transformation.
4) The peak regulation depth of the unit can be increased by 11MW, the loss of the abandoned wind and the abandoned light of 11MW can be correspondingly reduced, and the generated energy of the new energy unit is increased to 16500-33000 MWh.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The low-pressure cylinder low-flow working condition waste heat deep recovery heating system is characterized by comprising a condenser (4), a heat pump set (3) and a heat supply network head station (2);
the water outlet end of the condenser (4) is connected with a condenser circulating water outlet pipeline (6), and the condenser cooling water outlet pipeline (6) is connected to the cooling tower (5);
the condenser circulating water outlet pipeline (6) is provided with a branch which is a low-level heat source water inlet pipeline (9), the low-level heat source water inlet pipeline (9) is connected with a heat source inlet of the heat pump group (3), a heat source outlet of the heat pump group (3) is connected with a low-level heat source water return pipeline (11), and the low-level heat source water return pipeline (11) is converged into the condenser circulating water outlet pipeline (6);
a cold source inlet of the heat pump set (3) is connected with a heat supply network water return pipeline (7), a cold source outlet of the heat pump set (3) is connected with a heat supply network initial station (2) through a circulating water pipeline (10), and a water outlet end of the heat supply network initial station (2) is connected with user water;
the condenser (4) is used for cooling the exhaust steam of the low-pressure cylinder low-flow operation unit (1).
2. The low-pressure cylinder small-flow working condition waste heat deep recovery heating system is characterized in that a first valve (8) is arranged on the condenser circulating water outlet pipeline (6), and the first valve (8) is connected with the heat pump unit (3) in parallel.
3. The low-pressure cylinder low-flow working condition waste heat deep recovery heating system as claimed in claim 1, characterized in that a fourth valve (14) is arranged on the low-level heat source water inlet pipeline (9).
4. The low-pressure cylinder low-flow working condition waste heat deep recovery heating system as claimed in claim 1, characterized in that a second valve (12) is arranged on the heat supply network water return pipeline (7), and a third valve (13) is arranged on the circulating water pipeline (10).
5. The system according to claim 1, characterized in that the heat pump unit (3) is composed of parallel voltage compression heat pumps.
6. The low-pressure cylinder low-flow working condition waste heat deep recovery heating system is characterized in that the heat pump set (3) is formed by connecting absorption heat pumps in parallel.
7. The low-pressure cylinder low-flow operating condition waste heat deep recovery heating system as claimed in claim 1, characterized in that the cooling tower (5) is provided with a roller shutter.
8. The low-pressure cylinder low-flow working condition waste heat deep recovery heating system is characterized in that heating steam of the low-pressure cylinder low-flow operation unit (1) is connected to a heat supply network initial station (2).
9. The application method of the low-pressure cylinder low-flow working condition waste heat deep recovery heating system is characterized in that the return water of the heat supply network flows into the heat supply network initial station (2) for secondary temperature rise after being heated for the first time in the heat pump unit (3);
the cooling water absorbing heat in the condenser (4) is used as a low-level heat source to release heat in the heat pump unit (3), and the cooled cooling water flows back to the cooling tower (5).
10. The application method of the low-pressure cylinder small-flow working condition waste heat deep recovery heating system as claimed in claim 9, wherein the cooled cooling water enters the cooling tower (5) when the temperature is higher than or equal to 22 ℃, and otherwise enters a water pool of the cooling tower (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264565A (en) * | 2022-07-25 | 2022-11-01 | 西安西热节能技术有限公司 | Low-pressure cylinder zero-output unit waste heat deep recovery optimized heating system |
| BE1029512A1 (en) | 2022-10-28 | 2023-01-19 | Huaneng Shandong Power Generation Co Ltd | Combined cooling and heating waste heat recovery system for low pressure cylinder zero output supercritical unit |
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| CN111854462A (en) * | 2020-08-03 | 2020-10-30 | 西安热工研究院有限公司 | Full-working-condition cooling and anti-freezing system suitable for indirect air cooling heat supply unit |
| CN213450533U (en) * | 2020-10-29 | 2021-06-15 | 西安西热节能技术有限公司 | Winter low-flow steam-discharging condensation system with system-adjusting power source for indirect air cooling unit |
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| CN109855149A (en) * | 2017-11-30 | 2019-06-07 | Gs电力株式会社 | Combine the cogeneration of heat and power district heating production system and control method of heat pump system |
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| BE1029512A1 (en) | 2022-10-28 | 2023-01-19 | Huaneng Shandong Power Generation Co Ltd | Combined cooling and heating waste heat recovery system for low pressure cylinder zero output supercritical unit |
| BE1029512B1 (en) * | 2022-10-28 | 2024-01-03 | Huaneng jinan huangtai power generation co ltd | Combined cooling and heating waste heat recovery system for low pressure cylinder zero outlet supercritical unit |
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