CN219103105U - Plant-level heating system with series and parallel switching functions - Google Patents
Plant-level heating system with series and parallel switching functions Download PDFInfo
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- CN219103105U CN219103105U CN202223561844.2U CN202223561844U CN219103105U CN 219103105 U CN219103105 U CN 219103105U CN 202223561844 U CN202223561844 U CN 202223561844U CN 219103105 U CN219103105 U CN 219103105U
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Abstract
The utility model discloses a plant-level heat supply system with series-parallel switching functions, which comprises at least two cogeneration units, a heat supply network heater, a switching valve, a heat supply network water return pipeline, a heat supply steam pipeline and a drainage pipeline, wherein each cogeneration unit is communicated with one heat supply network heater through the heat supply steam pipeline and the drainage pipeline respectively, two ends of each heat supply network heater are connected in parallel through pipelines respectively, each pipeline is provided with the switching valve, one end of each heat supply network heater is communicated with the heat supply network water supply pipeline, the other end of each heat supply network heater is communicated with the heat supply network water return pipeline, and the opening and closing of the switching valve can enable each heat supply network heater to be connected in parallel or in series. According to the utility model, through switching of the switching valve, the cascade heating or the level heating of the heat supply network backwater can be realized, the operation mode of the system can be determined according to the operation mode of the cogeneration unit and the requirement of heat load, the operation flexibility of the heat supply unit is improved, and the operation mode of the heat supply system is optimized.
Description
Technical Field
The utility model relates to the technical field of plant-level heat supply systems, in particular to a plant-level heat supply system with series and parallel switching functions.
Background
The seasonal characteristic of the northern city in China is obvious, the heating period is longer, and is generally 4-6 months, so that the demand of the region for heating and heat supply is also larger, the large regional thermal power plant is utilized for central heat supply, energy sources can be saved, environmental pollution is reduced, and the method has higher heat economy and becomes a main mode for heating in northern cold regions. At present, more than 70% of buildings in the area adopt a central heating mode for heating, and more than half of the buildings adopt thermal power plants as heat sources. Along with the rising energy cost and the increasing environmental protection requirements, the energy-saving mode of the cogeneration has higher requirements. How to promote the energy-saving and optimized operation of the cogeneration unit becomes an important research content.
According to the heat and electricity relation characteristics and the energy cascade utilization principle of the cogeneration unit, aiming at the current situation that most of domestic thermal power plants adopt single heat supply systems such as parallel connection or series connection, a plant-level heat supply system with a series-parallel connection switching function is provided, so that the operation flexibility of the heat supply unit is improved, and the heat supply capacity of the heat supply unit is improved. As shown in fig. 2, taking a thermal power plant configured with two cogeneration units as an example, a single heating system connected in parallel or in series is generally adopted, and for a parallel heating system, heat supply network backwater is connected in parallel to heat supply network heaters corresponding to the two cogeneration units; as shown in fig. 3, for the series heating system, the return water of the heat supply network firstly enters the first machine heat supply network heater and then enters the second machine heat supply network heater, so that the temperature of the heat supply network water is gradually increased.
Disclosure of Invention
The utility model aims to provide a plant-level heat supply system with series and parallel switching functions, which solves the problems in the prior art, and enables the plant-level heat supply system to have the series and parallel switching functions so as to improve the operation flexibility of a heat supply unit and the heat supply capacity of the heat supply unit.
In order to achieve the above object, the present utility model provides the following solutions:
the utility model provides a plant-level heating system with series-parallel switching functions, which comprises at least two cogeneration units, at least two heat supply network heaters, at least two switching valves, a heat supply network water return pipeline, a heat supply network water supply pipeline, a heat supply steam pipeline and a drainage pipeline, wherein each heat supply network heater is communicated with one heat supply network heater through the heat supply steam pipeline and the drainage pipeline, two ends of each heat supply network heater are respectively connected in parallel through pipelines, each pipeline is provided with the switching valve, one end of each heat supply network heater is communicated with the heat supply network water supply pipeline, the other end of each heat supply network heater is communicated with the heat supply network water return pipeline, and the opening and closing of each switching valve are adjusted to enable each heat supply network heater to be connected in parallel or in series.
Preferably, water inlet valves are arranged on pipelines which are communicated with the heat supply network water supply pipeline and the heat supply network heater, and water outlet valves are arranged on pipelines which are communicated with the heat supply network water return pipeline.
Preferably, the cogeneration unit comprises a first cogeneration unit and a second cogeneration unit, a hydraulic control butterfly valve is arranged on a medium-low pressure communicating pipeline of the first cogeneration unit and the second cogeneration unit, a cooling steam bypass valve is arranged on a cooling steam bypass pipeline, the medium-low pressure communicating pipeline is communicated with the heating steam pipeline, and a heating steam regulating valve is arranged on the heating steam pipeline.
Preferably, the first heat and power cogeneration unit and the second heat and power cogeneration unit are both provided with multi-stage regenerative extraction, and the regenerative extraction with the heating pressure of 0.3Pa-0.4MPa is selected by heating adjustment extraction in the heating steam pipeline.
Preferably, the first heat and power cogeneration unit and the second heat and power cogeneration unit are both provided with 8-level regenerative steam extraction, the heating adjustment steam extraction in the heating steam pipeline selects 5-level steam extraction, and the drainage pipeline is communicated with 4-level steam extraction.
Preferably, the water inlet end of one heat supply network heater and the water outlet end of the other heat supply network heater are communicated through pipelines, and the water outlet end is communicated with the water inlet end of the other heat supply network heater.
Preferably, at least one heat supply network heater is connected in series to each cogeneration unit.
Preferably, the heat supply modes of the cogeneration units comprise a condensing heat supply mode and a low-pressure cylinder zero-output mode, and the on-off of the switching valve is regulated according to the heat supply modes and the heat load demands of the cogeneration units, so that the cogeneration units realize cascade heat supply and parallel flat heat supply.
Compared with the prior art, the utility model has the following technical effects:
the plant-level heating system with the series-parallel switching function can realize cascade heating or level heating of the heat supply network backwater through the switching of the switching valve, can determine the operation mode of the system according to the operation mode of the cogeneration unit and the requirement of heat load, improves the operation flexibility of the heat supply unit, is beneficial to realizing the cascade utilization of energy, and optimizes the operation mode of the heat supply system.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a plant-level heating system with series-parallel switching in accordance with the present utility model;
FIG. 2 is a schematic diagram of a prior art series plant-level heating system;
FIG. 3 is a schematic diagram of a prior art parallel plant-level heating system;
wherein: 100-plant-level heat supply system with series and parallel switching functions, 1-boiler, 2-high-pressure cylinder, 3-medium-pressure cylinder, 4-low-pressure cylinder, 5-generator, 6-hydraulic control butterfly valve, 7-heating steam regulating valve, 8-cooling steam bypass valve, 9-condenser, 10-condensate pump, 11-condensate polishing device, 12-shaft seal steam cooler, 13-low-pressure heater, 14-high-pressure heater, 15-feed pump, 16-feed pump turbine, 17-deaerator, 18-pre-pump, 20-heat supply network return water pipeline, 21-heat supply network water supply pipeline, 22-heating steam pipeline, 23-hydrophobic pipeline, 24-first machine heat supply network heater, 25-first machine water inlet valve, 26-first switching valve, 27-second machine heat supply network heater, 28-second machine, 29-second switching valve, 30-first machine water outlet valve, 31-second machine water outlet valve, A-first heat power generation unit, B-second heat generation unit.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to fall within the scope of the utility model.
The utility model aims to provide a plant-level heat supply system with series and parallel switching functions, which solves the problems in the prior art, and enables the plant-level heat supply system to have the series and parallel switching functions so as to improve the operation flexibility of a heat supply unit and the heat supply capacity of the heat supply unit.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1: the present embodiment provides a plant-level heating system 100 with series-parallel switching functions, which comprises at least two cogeneration units, at least two heat supply network heaters, at least two switching valves, a heat supply network water return pipeline 20, a heat supply network water supply pipeline 21, a heat supply steam pipeline 22 and a drainage pipeline 23, wherein each cogeneration unit is respectively communicated with one heat supply network heater through the heat supply steam pipeline 22 and the drainage pipeline 23, two ends of each heat supply network heater are respectively connected in parallel through pipelines, each pipeline is provided with a switching valve, one end of each heat supply network heater is communicated with the heat supply network water supply pipeline 21, the other end of each heat supply network heater is communicated with the heat supply network water return pipeline 20, and the opening and closing of the switching valve can enable each heat supply network heater to be connected in parallel or connected in series.
Preferably, the pipeline of the heat supply network heater communicated with the heat supply network water supply pipeline 21 is provided with water inlet valves, and the pipeline of the heat supply network heater communicated with the heat supply network water return pipeline 20 is provided with water outlet valves. The water inlet end of one heat supply network heater is communicated with the water outlet end of the other heat supply network heater through a pipeline, and the water outlet end is communicated with the water inlet end of the other heat supply network heater. At least one heat supply network heater is connected in series on each cogeneration unit. The heat supply modes of the cogeneration units comprise a condensing heat supply mode and a low-pressure cylinder zero-output mode, and the on-off of the switching valve is regulated according to the heat supply modes and the heat load demands of the cogeneration units, so that the cogeneration units realize cascade heat supply and parallel flat heat supply. According to the embodiment, the water inlet valve, the water outlet valve and the switching valve are opened and closed, flexible switching between series cascade heat supply and parallel level heat supply can be realized, and the running mode of the heat supply system can be determined by taking the highest plant-level economy as an objective function according to the heat supply mode of the unit and the heat load requirement.
Preferably, the cogeneration unit in this embodiment includes a first cogeneration unit a and a second cogeneration unit B, a hydraulic control butterfly valve 6 is disposed on a medium-low pressure communicating pipe of the first cogeneration unit a and the second cogeneration unit B, and a cooling steam bypass valve 8 is disposed on a cooling steam bypass path, so that flexibility of unit heat supply can be increased, heat supply capacity is improved, cooling steam still having about 18t/h after the low pressure cylinder 4 is cut off still enters the low pressure cylinder, and blast heat generated by rotation of a low pressure rotor is taken away. The medium-low pressure communication pipelines are communicated with a heat supply steam pipeline 22, and a heat supply steam regulating valve is arranged on the heat supply steam pipeline 22. The first heat and power cogeneration unit A and the second heat and power cogeneration unit B are both provided with multi-stage heat recovery steam extraction, and the heat recovery steam extraction with the heat supply pressure of 0.3Pa-0.4MPa is selected for heating adjustment steam extraction in the heat supply steam pipeline 22, so that the general civil heat supply requirement is ensured. The first heat and power cogeneration unit A and the second heat and power cogeneration unit B are respectively provided with 8-level back heating steam extraction, the heating adjustment steam extraction in the heating steam pipeline 22 selects 5-level steam extraction, and the drainage pipeline 23 is communicated with 4-level steam extraction. The unit of this embodiment can be taken out and congeal between heat supply mode and the zero mode of exerting oneself of low pressure jar and switch over, has promoted the flexibility of unit operation: when the hydraulic control butterfly valve 6 is closed and the cooling steam bypass valve 8 is opened, the unit is in a low-pressure cylinder zero-output heat supply mode; when the hydraulic control butterfly valve 6 is opened and the cooling steam bypass valve 8 is closed, the unit is in a condensing and heating mode.
As shown in fig. 1, each cogeneration unit is provided with 2 heat supply network heaters (only 1 is shown in fig. 1) in series, main steam from a boiler 1 sequentially enters a high-pressure cylinder 2, a medium-pressure cylinder 3 and a low-pressure cylinder 4 of a steam turbine to perform expansion work, steam discharged from the low-pressure cylinder 1 enters a condenser 9 to release heat, and formed condensate enters the boiler 1 to absorb heat after passing through a condensate pump 10, a condensate polishing device 11, a low-pressure heater 13, a feed pump 15 and a high-pressure heater 14. The heating system of this embodiment includes a first heat supply network heater 24, a second heat supply network heater 27, a first switching valve 26, a second switching valve 29, a heat supply network water return pipeline 20, a heat supply network water supply pipeline 21, a heat supply steam pipeline 22 and a drain pipeline 23, the first heat supply network heater 24 is correspondingly connected with a first water inlet valve 25 and a first water outlet valve 30, and the second heat supply network heater 27 is correspondingly connected with a second water inlet valve 28 and a second water outlet valve 31. Taking a certain power plant as an example, two 300 MW-level cogeneration units are provided, each cogeneration unit has 8-level regenerative extraction, wherein the 5 th-level extraction is heating adjustment extraction, the designed heating pressure is 0.35MPa, the rated heating steam amount is 400t/h, and the maximum heating steam amount is 560t/h.
Wherein, the exhaust steam or the extraction steam of the medium pressure cylinder 3 of the cogeneration unit respectively enters a heat supply network heater 24 and a heat supply network heater 27 by utilizing a heat supply steam pipeline 22, the heat supply network backwater is heated by utilizing the heat supply steam, and the drain water generated by the condensation of the heat supply steam is sent to the deaerator 17 through a drain pipeline 23. The return water of the heat supply network enters the heat supply network heater 24 through the inlet valve 25 of the first machine on the return water pipeline 20, absorbs heat, and finally is converged into the water supply pipeline 21 of the heat supply network through the outlet valve 30 of the first machine. A first switching valve 26 and a second switching valve 29 are arranged between the first machine heating network heater 24 and the second machine heating network heater 27.
In the operation process, if the water inlet valve 28 of the second machine, the water inlet valve 25 of the first machine, the water outlet valve 30 of the first machine and the water outlet valve 31 of the second machine are opened, the first switching valve 26 and the second switching valve 29 are closed, the heat supply network backwater respectively enters the heat supply network heater 24 of the first machine and the heat supply network heater 27 of the second machine through the water inlet valve 25 of the first machine and the water inlet valve 28 of the second machine to absorb heat, and then respectively enters the heat supply network water supply pipeline 21 through the water outlet valve 30 of the first machine and the water outlet valve 31 of the second machine, and at the moment, the heat supply network heater 24 of the first machine and the heat supply network heater 27 of the second machine are in parallel operation, so that a parallel flat-level heat supply system is formed. If the water inlet valve 28, the first switching valve 26 and the water outlet valve 30 of the second machine are opened, the water inlet valve 25, the second switching valve 29 and the water outlet valve 31 of the second machine are closed, the heat supply network backwater firstly enters the heat supply network heater 27 through the water inlet valve 28 of the second machine, then flows through the switching valve 26 to enter the heat supply network heater 24 for absorbing heat, and then flows into the heat supply network water supply pipeline 21 through the water outlet valve 30 of the first machine, and at the moment, the heat supply network heater 24 of the first machine and the heat supply network heater 27 of the second machine are operated in series, so that a series cascade heat supply system is formed. If the first machine water inlet valve 25, the second switching valve 29 and the second machine water outlet valve 31 are opened, the second machine water inlet valve 28, the first switching valve 26 and the first machine water outlet valve 30 are closed, the heat supply network backwater firstly enters the heat supply network heater 24 through the first machine water inlet valve 25, then flows through the second switching valve 29 to enter the heat supply network heater 27 for absorbing heat, and then flows into the heat supply network water supply pipeline 21 through the second machine water outlet valve 31, and at the moment, the first machine heat supply network heater 24 and the second machine heat supply network heater 27 are operated in series to form a series cascade heat supply system. By opening and closing the valve, flexible switching between series cascade heat supply and parallel level heat supply can be realized.
And determining the operation mode of the heating system by taking the highest plant-level economy as an objective function according to the heating mode and the heat load requirement of the cogeneration unit.
The net benefits E of factory-level electricity selling, heat selling and participating in deep peak shaving of the power grid in unit time are as follows:
E＝c e P e +c h Q h +G p -c coal B coal
wherein C is e The online electricity price is obtained; pe is the power generation load; c h Is a heat price; q (Q) h The total heat supply load for the plant level is GJ/h; c coal The price of the standard coal; b (B) coal Is the coal consumption of the plant level; g p Compensating benefit for plant-level deep peak shaving.
When the hydraulic butterfly valves 6 of the two cogeneration units are simultaneously opened or closed, the two cogeneration units are in the same heat supply mode (a double condensing heat supply mode or a double low-pressure cylinder zero-output heat supply mode), the heat supply system preferably adopts parallel flat heat supply in an operation mode, and at the moment, the water inlet valve 28 of the second machine, the water inlet valve 25 of the first machine, the water outlet valve 30 of the first machine and the water outlet valve 31 of the second machine are opened, the first switching valve 26 and the second switching valve 29 are closed, and the heat supply network heaters of the two cogeneration units operate in parallel.
When the first cogeneration unit A is in the low-pressure cylinder zero-output heat supply mode and the second cogeneration unit B is in the extraction condensation heat supply mode, in order to ensure higher plant-level net benefit, the heat supply system preferably adopts a series cascade heat supply operation mode, and heat supply network backwater flows through the second heat supply network heater 27 and then flows through the first heat supply network heater 24, at the moment, the second water inlet valve 28, the first switching valve 26 and the first water outlet valve 30 are opened, and the first water inlet valve 25, the second switching valve 29 and the second water outlet valve 31 are closed.
When the first cogeneration unit A is in the 'condensation heating' mode and the second cogeneration unit B is in the 'low-pressure cylinder zero-output heating' mode, the heating system preferably adopts a series cascade heating operation mode to ensure higher plant-level net benefit, and the heat supply network backwater flows through the first machine heat supply network heater 24 and then flows through the second machine heat supply network heater 27, at the moment, the first machine water inlet valve 25, the second switching valve 29 and the second machine water outlet valve 31 are opened, and the second machine water inlet valve 28, the first switching valve 26 and the first machine water outlet valve 30 are closed.
In the embodiment, when series cascade heat supply operation is selected, one cogeneration unit is preferably in a condensing heat supply mode, the other cogeneration unit is preferably in a low-pressure cylinder zero-output mode, and heat supply network backwater firstly flows through a heat supply network heater in the condensing heat supply mode and then flows through a heat supply network heater in the low-pressure cylinder zero-output mode; when parallel flat-stage heating operation is selected, the two cogeneration units are preferably in the same heating mode.
The principles and embodiments of the present utility model have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present utility model and its core ideas; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.
Claims (8)
1. A plant-level heating system with series and parallel switching functions is characterized in that: including at least two cogeneration units, at least two switching valves, heat supply network water return pipeline, heat supply network water supply pipeline, heat supply steam pipeline and drainage pipeline, each the cogeneration unit is respectively through heat supply steam pipeline with the drainage pipeline is with one the heat supply network heater intercommunication, each the heat supply network heater both ends are respectively through the pipeline parallelly connected and every all be provided with on the pipeline the switching valve, each the one end of heat supply network heater all with heat supply network water supply pipeline intercommunication, the other end all with heat supply network water return pipeline intercommunication, adjust the switching valve open and close can make each the heat supply network heater connects in parallel or establishes ties.
2. The plant-level heating system with serial-parallel switching function of claim 1, wherein: and water inlet valves are arranged on pipelines which are communicated with the heat supply network water supply pipeline and the heat supply network heater, and water outlet valves are arranged on pipelines which are communicated with the heat supply network water return pipeline.
3. The plant-level heating system with serial-parallel switching function of claim 1, wherein: the heat and power cogeneration unit comprises a first heat and power cogeneration unit and a second heat and power cogeneration unit, wherein a hydraulic control butterfly valve is arranged on a medium-low pressure communicating pipeline of the first heat and power cogeneration unit and the second heat and power cogeneration unit, a cooling steam bypass valve is arranged on a cooling steam bypass pipeline, the medium-low pressure communicating pipeline is communicated with the heat supply steam pipeline, and a heat supply steam regulating valve is arranged on the heat supply steam pipeline.
4. A plant-level heating system with serial-parallel switching as recited in claim 3, wherein: the first heat and power cogeneration unit and the second heat and power cogeneration unit are both provided with multi-stage regenerative extraction, and the regenerative extraction with the heating pressure of 0.3Pa-0.4MPa is selected for heating adjustment extraction in the heating steam pipeline.
5. A plant-level heating system with serial-parallel switching as recited in claim 3, wherein: the first heat and power cogeneration unit and the second heat and power cogeneration unit are respectively provided with 8-level regenerative steam extraction, the heating adjustment steam extraction in the heating steam pipeline selects 5-level steam extraction, and the drainage pipeline is communicated with 4-level steam extraction.
6. The plant-level heating system with serial-parallel switching function of claim 1, wherein: the water inlet end of one heat supply network heater is communicated with the water outlet end of the other heat supply network heater through a pipeline, and the water outlet end is communicated with the water inlet end of the other heat supply network heater.
7. The plant-level heating system with serial-parallel switching function of claim 1, wherein: and each cogeneration unit is at least connected with one heat supply network heater in series.
8. The plant-level heating system with serial-parallel switching function of claim 1, wherein: the heat supply modes of the cogeneration units comprise a condensation heat supply mode and a low-pressure cylinder zero-output mode, and the opening and closing of the switching valve are regulated according to the heat supply modes and the heat load demands of the cogeneration units, so that the cogeneration units realize cascade heat supply and parallel flat heat supply.
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| CN202223561844.2U CN219103105U (en) | 2022-12-30 | 2022-12-30 | Plant-level heating system with series and parallel switching functions |
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| CN202223561844.2U CN219103105U (en) | 2022-12-30 | 2022-12-30 | Plant-level heating system with series and parallel switching functions |
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