Long-distance pipeline network section heat storage regulating device and method

Abstract

The application discloses a kind of long pipe network segmented heat storage regulating method, comprising: unit device, and with unit device connection relay pump station device, with relay pump station device connection city network circulation device;Unit device includes unit and heat network heater, unit is connected with heat network heater by pipeline;Relay pump station device includes pressure barrier heat exchanger, first water mixing valve, second water mixing valve and pressure barrier station bypass valve, first water mixing valve is set on first branch, second water mixing valve is set on second branch, pressure barrier station bypass valve is set on third branch.The application changes heat load by a variety of segmented flow regulation and heat storage regulation, realizes the requirement of heating precision regulation;Reduce the cycle of quantitative regulation, can be flexibly adjusted to realize load side fast response at various times;Reduce the local water supply flow of long pipe network, realize the energy-saving operation of long pipe network multistage pump station and decoupling of unit side electric load and user side heat load, it is conducive to realizing the peaking requirement with hour as scale.

Description

Technical Field

[0001] This invention relates to the field of pipeline heating regulation technology, and in particular to a segmented heat storage regulation method for long-distance pipelines. Background Technology

[0002] Traditional decentralized boiler room heating is insufficient to meet carbon emission requirements and results in energy waste and air pollution. Meanwhile, many cities in northern my country currently have limited centralized heating capacity, failing to meet urban heating demands and resulting in significant heating gaps. Therefore, large power plants must adopt practical and feasible technological means to improve their unit heating capacity and meet heating needs across larger service areas.

[0003] Long-distance heating, as a centralized heating method, offers energy-saving benefits by reducing urban environmental pollution and promoting comprehensive energy utilization. It can cover a large surrounding heating area centered around a large thermal power plant. Some large thermal power units, due to their distance from urban areas, require centralized heating via long-distance transmission. However, long-distance heating also faces the challenges of co-regulating heat and electricity loads as seen in traditional combined heat and power (CHP) units. Currently, long-distance heating technology is still in its early stages in China. Heat load regulation typically employs phased quantitative and qualitative adjustments. Quantitative adjustment generally involves adjusting the flow rate in stages while maintaining a consistent overall flow rate across the long-distance heating network. Qualitative adjustment, on the other hand, involves changing the water supply temperature at the power plant's primary station to regulate the load at the pressure relief station, while maintaining a constant flow rate.

[0004] Currently, the phased quantitative regulation method ensures consistent overall flow in the long-distance heating network. Within a specific phase, heat load can only be altered through qualitative regulation, requiring precise control of the power plant's heating supply. This phased quantitative regulation method typically divides the entire heating season into 3-4 phases; within each phase, qualitative regulation via power plant adjustments is insufficient to accurately respond to load demands. Furthermore, ensuring consistent overall flow in the long-distance heating network leads to waste due to excessive circulating water flow and high energy consumption of multi-stage pumps. Additionally, this method exhibits strong thermoelectric coupling, making it difficult to coordinate with generating units to achieve hourly peak-shaving requirements. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the aforementioned existing problems, the present invention is proposed.

[0007] Therefore, this invention provides a segmented thermal storage regulation method for long-distance pipeline networks, which solves the problems of difficulty in responding to accurate load demands; waste due to excessive circulating water flow and high energy consumption of multi-stage pumps; and difficulty in coordinating with units to achieve hourly peak-shaving requirements due to strong thermoelectric coupling.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a segmented thermal storage and regulation device for long-distance pipeline networks includes a generator unit, a relay pumping station connected to the generator unit, and an urban network circulation device connected to the relay pumping station; the generator unit includes a generator unit and a heating network heater, and the generator unit is connected to the heating network heater through a pipeline;

[0009] The relay pump station device includes a pressure-isolating heat exchanger, a first mixing valve, a second mixing valve, and a pressure-isolating station bypass valve. The first mixing valve is located on a first branch, the second mixing valve is located on a second branch, and the pressure-isolating station bypass valve is located on a third branch.

[0010] As a preferred embodiment of the segmented thermal storage and regulation device for long-distance pipelines described in this invention, the relay pump station device further includes a first water supply pump and a first return water pump, which are installed on the pipeline between the first mixing valve and the second mixing valve.

[0011] As a preferred embodiment of the segmented heat storage and regulation device for long-distance pipelines described in this invention, the relay pump station device further includes a second water supply pump and a second return water pump, which are installed on the pipeline between the second mixing valve and the pressure-isolation heat exchanger.

[0012] As a preferred embodiment of the segmented heat storage and regulation device for long-distance pipelines described in this invention, the first branch, the second branch, and the third branch are connected in parallel with the pressure-reducing heat exchanger.

[0013] As a preferred embodiment of the segmented heat storage and regulation device for long-distance pipelines described in this invention, the relay pump station device further includes a pressure-reducing station return water pump installed at the outlet pipeline of the pressure-reducing heat exchanger.

[0014] As a preferred embodiment of the segmented heat storage and regulation device for long-distance pipelines described in this invention, the urban network circulation device includes an urban network pipeline and an urban network return water pump. One end of the urban network return water pump is connected to the outlet of the urban network pipeline, and the other end is connected to the inlet of the pressure-isolation heat exchanger.

[0015] As a preferred embodiment of the segmented heat storage and regulation device for long-distance pipelines described in this invention, the outlet end of the pressure-reducing heat exchanger is also connected to the urban network pipeline via a pipeline.

[0016] The segmented thermal storage regulation method for long-distance pipelines includes the following: when the unit's electrical load needs to be increased by 150MW during operation, the opening of the first mixing valve is opened to 20%, and 30% of the high-temperature water supply flows into the low-temperature return water of the long-distance pipeline after the first return water pump before flowing through the first water supply pump.

[0017] As a preferred embodiment of the segmented thermal storage regulation method for long-distance pipeline networks described in this invention, during operation, when the unit's electrical load needs to be increased by 150MW, the opening of the second mixing valve is opened to 30%, and 30% of the high-temperature water supply flows into the low-temperature return water of the long-distance pipeline network after being mixed with the second return water pump before flowing through the second water supply pump.

[0018] As a preferred embodiment of the segmented heat storage regulation method for long-distance pipelines described in this invention, when the unit's electrical load needs to be increased by 150MW during operation, the bypass valve of the pressure diaphragm station is opened to 40%, and 30% of the high-temperature water supply flows into the low-temperature return water of the long-distance pipeline after being mixed with the return water pump of the pressure diaphragm station before flowing through the pressure diaphragm heat exchanger.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This device and method, based on the original staged quantity regulation method, breaks the requirement of consistent overall flow in long-distance heating pipelines. It can change the heat load through various segmented flow regulation and heat storage regulation, reducing the requirements for precise heating regulation on the power plant side; it further reduces the cycle of quantity regulation, and can achieve rapid response on the load side through flexible quantity regulation methods at various times; it reduces the local water supply flow of the long-distance network, which is conducive to achieving energy-saving operation of multi-stage pumping stations in the long-distance pipeline network; it achieves decoupling of the unit-side electrical load and the user-side heat load, which is conducive to cooperating with the unit to achieve hourly peak-shaving requirements. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0021] Figure 1 This is a schematic diagram of the structure of a segmented thermal storage and regulation device for long-distance pipelines according to an embodiment of the present invention;

[0022] Figure 2 This is a diagram showing the distribution of circulating water temperature and flow rate under the traditional regulation operation mode in a segmented thermal storage regulation method for long-distance pipelines according to an embodiment of the present invention.

[0023] Figure 3This is a diagram showing the temperature and flow distribution of circulating water using the first mixing valve in a segmented thermal storage regulation method for long-distance pipelines according to an embodiment of the present invention.

[0024] Figure 4 This is a diagram showing the temperature and flow distribution of circulating water using the second mixing valve in a segmented thermal storage regulation method for long-distance pipelines according to an embodiment of the present invention.

[0025] Figure 5 This is a diagram showing the temperature and flow distribution of circulating water in a segmented thermal storage regulation method for long-distance pipelines according to an embodiment of the present invention, utilizing the bypass valve of a pressure-reducing station.

[0026] Figure 6 The diagram shows the power consumption of each pumping station under different adjustment modes of the segmented thermal storage adjustment method for long-distance pipelines described in the first embodiment of the present invention. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0030] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0031] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example 1

[0034] Reference Figure 1 As an embodiment of the present invention, a segmented thermal storage regulation device and method for long-distance pipeline networks are provided, comprising:

[0035] The unit 100 includes a generator set 101 and a relay pumping station 200 connected to the generator set 100, and a city network circulation device 300 connected to the relay pumping station 200. The generator set 100 includes a generator set 101 and a heating network heater 102, with the generator set 101 connected to the heating network heater 102 via a pipeline. The relay pumping station 200 includes a pressure-reducing heat exchanger 201, a first mixing valve 202, a second mixing valve 203, and a pressure-reducing station bypass valve 204. The first mixing valve 202 is located on a first branch S1, the second mixing valve 203 is located on a second branch S2, and the pressure-reducing station bypass valve 204 is located on a third branch S3.

[0036] It should be noted that both the generating unit 101 and the heating network heater 102 can be located within the power plant.

[0037] Furthermore, the relay pump station device 200 also includes a first water supply pump 205 and a first return water pump 207, which are installed on the pipeline between the first mixing valve 202 and the second mixing valve 203.

[0038] It should be noted that the first water supply pump 205 and the first return water pump 207 can be located in a relay pumping station 20 kilometers away from the power plant.

[0039] Furthermore, the relay pump station device 200 also includes a second water supply pump 206 and a second return water pump 208, which are installed on the pipeline between the second mixing valve 203 and the pressure isolation heat exchanger 201.

[0040] It should be noted that the second water supply pump 206 and the second return water pump 208 can be located in a relay pumping station fifty kilometers away from the power plant.

[0041] Furthermore, the first branch S1, the second branch S2, and the third branch S3 are connected in parallel with the pressure-isolated heat exchanger 201.

[0042] Furthermore, the relay pump station device 200 also includes a pressure-reducing station return water pump 209 installed at the outlet pipe of the pressure-reducing heat exchanger 201.

[0043] It should be noted that the pressure-reducing heat exchanger 201 and the pressure-reducing station return water pump 209 can be located in a pressure-reducing station 70 kilometers away from the power plant.

[0044] Furthermore, the urban network circulation device 300 includes an urban network pipeline 301 and an urban network return water pump 302. One end of the urban network return water pump 302 is connected to the outlet of the urban network pipeline 301, and the other end is connected to the inlet of the pressure-isolated heat exchanger 201.

[0045] Furthermore, the outlet end of the pressure-reducing heat exchanger 201 is also connected to the urban network pipeline 301 via a pipeline.

[0046] It should be noted that the urban network circulating water circulates in the pressure-isolated heat exchanger 201 and the urban network pipeline 301 through the urban network return water pump 302.

[0047] During traditional operation, the first mixing valve 202, the second mixing valve 203, and the bypass valve 204 of the pressure reducing station are all in the closed state. The circulating water flow rate is consistent throughout the long-distance pipeline. The water supply temperature and flow rate of the long-distance pipeline meet the heating demand of the urban network on the side of the pressure reducing station. That is, the unit 101 provides heating on demand according to the heating demand of the urban network pipeline 301, and generates electricity at the same time.

[0048] Heating steam supplied by unit 101 enters the heating network heater 102, heating the long-distance transmission network circulating water on the other side of the heater 102. The heating steam itself is condensed into liquid water and returned to the unit via condensate pump A. The long-distance transmission network circulating water is first pressurized by the first station circulating water pump B, and after its temperature rises in the heating network heater 102, it flows to the first supply water pump 205. After being pressurized again by the first supply water pump 205, it flows to the second supply water pump 206. After being pressurized again by the second supply water pump 206, it flows to the pressure isolation heat exchanger 201, heating the city network circulating water on the other side of the pressure isolation heat exchanger 201. After its temperature drops, the long-distance transmission network circulating water is pressurized by the pressure isolation station return water pump 209, flows to the second return water pump 208, is pressurized again by the second return water pump 208, flows to the first return water pump 207, is pressurized again by the first return water pump 207, and flows back to the first station circulating water pump B to start a new cycle. The circulating water from the urban network enters the pressure-isolated heat exchanger 201 via the urban network return water pump 302. Inside the pressure-isolated heat exchanger 201, it absorbs heat from the circulating water in the long-distance transmission network, its temperature rises, and it enters the urban network pipeline 301 to meet the user's heating needs.

[0049] The design of the first mixing valve 202, the second mixing valve 203, and the pressure relief station bypass valve 204 and their branches makes...

[0050] During operation, when the electrical load of Unit 101 needs to be increased by 150MW, it can be achieved through the following segmented thermal storage regulation method using long-distance pipelines. Assuming that the electrical load of Unit 101 needs to be increased from 250MW to 300MW, resulting in an increase in output heat from 80MW to 150MW, there are three methods:

[0051] The first mixing valve 202 is opened to 20%, allowing 30% of the high-temperature water to flow into the low-temperature return water of the long-distance transmission network before flowing through the first water supply pump 205 and mixing with the first return water pump 207.

[0052] It should be noted that at this time, the temperature remains consistent throughout the water supply pipeline from the heating network heater 102 to the heat exchanger 201 of the pressure isolation station. However, because some high-temperature water is directly introduced into the return water pipeline from the first return water pump 207 to the first station circulating water pump B via the first branch S1 where the first mixing valve 202 is located, the temperature of the long-distance circulating water from the first return water pump 207 to the first station circulating water pump B is increased, thereby increasing the heat storage capacity of this part. This adjustment method also reduces the flow rate of the long-distance circulating water, including the first supply water pump 205 and subsequent pumps, thereby reducing the power consumption of the multi-stage pumps other than the first station circulating water pump B, and achieving decoupling of the electrical load of the unit 101 from the thermal load of the urban network pipeline 301.

[0053] The second mixing valve 203 is opened to 30%, allowing 30% of the high-temperature water to flow into the low-temperature return water of the long-distance transmission network before flowing through the second water supply pump 206 and mixing with the water after the second return pump 208.

[0054] It should be noted that at this time, the temperature remains consistent throughout the water supply pipeline from the heating network heater 102 to the pressure reducing station heat exchanger 201. However, because some high-temperature water is directly introduced into the return water pipeline from the second return water pump 208 to the first station circulating water pump B via the second branch S2 connected to the second mixing valve 203, the temperature of the long-distance circulating water from the second return water pump 208 to the first station circulating water pump B is increased, thereby increasing the heat storage capacity of this portion. This adjustment method also reduces the flow rate of the long-distance circulating water, including the second return water pump 208 and subsequent pumps, thereby reducing the pump power consumption of the second return water pump 208, the pressure reducing station return water pump 209, and the second return water pump 208.

[0055] Open the bypass valve 204 of the pressure relief station to 40%, and let 30% of the high-temperature supply water flow into the low-temperature return water of the long-distance transmission network before flowing through the pressure relief heat exchanger 201 and mixing with the return water pump 209 of the pressure relief station.

[0056] It should be noted that at this time, the temperature remains consistent throughout the water supply pipeline from the heating network heater 102 to the pressure reducing station heat exchanger 201. However, because some high-temperature water is directly introduced into the return water pipeline from the pressure reducing station return water pump 209 to the first station circulating water pump B via the third branch S3 where the pressure reducing station bypass valve 204 is located, the temperature of the long-distance circulating water from the pressure reducing station return water pump 209 to the first station circulating water pump B is increased, thereby increasing the heat storage capacity of this portion. This adjustment method also reduces the long-distance circulating water flow rate of the pressure reducing station return water pump 209, thereby reducing the pump power consumption of the pressure reducing station return water pump 209.

[0057] Example 2

[0058] Reference Figure 2-6 As an embodiment of the present invention, a method for segmented heat storage regulation of long-distance pipelines is provided. To verify its beneficial effects, comparative experimental data are provided for illustrative purposes.

[0059] During traditional operation, the first mixing valve 202, the second mixing valve 203, and the bypass valve 204 of the pressure reducing station are all in the closed state. The circulating water flow rate is consistent throughout the long-distance pipeline. The water supply temperature and flow rate of the long-distance pipeline meet the heating demand of the urban network on the side of the pressure reducing station. That is, the unit 101 provides heating on demand according to the heating demand of the urban network pipeline 301, and generates electricity at the same time. Figure 2 It shows the operating temperature and flow rate of each section of the long-distance pipeline during normal operation.

[0060] Open the first mixing valve 202 to 20%, allowing 30% of the high-temperature supply water to flow into the low-temperature return water of the long-distance transmission network before flowing through the first supply pump 205 and mixing with the first return pump 207. See below for details on this method. Figure 3 The first mixing valve 202 is used to change the operating temperature and flow rate of the pipeline network.

[0061] Open the second mixing valve 203 to 30%, allowing 30% of the high-temperature supply water to flow into the low-temperature return water of the long-distance transmission network after being mixed with the second return water pump 208, before flowing through the second supply pump 206. (See below for details on this method.) Figure 4 The second mixing valve 203 is used to change the operating temperature and flow rate of the pipeline network.

[0062] Open the bypass valve 204 of the pressure relief station to 40%, allowing 30% of the high-temperature supply water to flow into the low-temperature return water of the long-distance transmission network before flowing through the pressure relief heat exchanger 201 and mixing with the return water pump 209 of the pressure relief station. (See below for details.) Figure 5 The bypass valve 204 of the pressure relief station is used to change the operating temperature and flow rate of the pipeline network.

[0063] It can be observed that different adjustment methods can change the temperature and flow rate at different locations, thereby enabling precise control.

[0064] Figure 6 To assess the power consumption of each pump station under different adjustment methods, it can be found that the adjustment method using the first mixing valve 202, the second mixing valve 203, and the bypass valve 204 of the pressure isolation station can significantly reduce the power consumption under the traditional normal method.

[0065] Table 1 compares the total power consumption of different adjustment methods, and it is clear that valve adjustment can reduce the overall power consumption.

[0066] Table 1 Total power consumption of multi-stage pumps in long-distance pipelines under different adjustment methods

[0067]

[0068] When the power grid dispatching issues a regulation request to the electrical load of unit 101, causing a mismatch between the current electrical load and the user-side heat load obtained based on demand forecasting, this scheme changes the current heat storage status of the pipeline network by setting and changing the opening of the first mixing valve 202, the second mixing valve 203, and the pressure isolation station bypass valve 204.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for segmented heat storage regulation in long-distance pipeline networks, characterized in that, The method is applied to a segmented thermal storage and regulation device for long-distance pipeline networks, and the device includes: Unit equipment (100), and, The relay pumping station device (200) connected to the unit device (100), Urban network circulation device (300) connected to the relay pump station device (200); The unit (100) includes a unit (101) and a heat network heater (102), with the unit (101) connected to the heat network heater (102) via a pipeline; The relay pump station device (200) includes a pressure-isolated heat exchanger (201), a first mixing valve (202), a second mixing valve (203), and a pressure-isolated station bypass valve (204). The first mixing valve (202) is installed on the first branch (S1), the second mixing valve (203) is installed on the second branch (S2), and the pressure-isolated station bypass valve (204) is installed on the third branch (S3). The relay pump station device (200) further includes a first water supply pump (205) and a first return water pump (207), which are installed on the pipeline between the first mixing valve (202) and the second mixing valve (203); The relay pump station device (200) also includes a second water supply pump (206) and a second return water pump (208), which are installed on the pipeline between the second mixing valve (203) and the pressure isolation heat exchanger (201); The method includes: During operation, when the electrical load of the unit (101) needs to be increased by 150MW, the opening of the first mixing valve (202) is opened to 20%, and 30% of the high-temperature water flows into the low-temperature return water of the long-distance transmission network after being mixed with the first return water pump (207) before flowing through the first water supply pump (205); During operation, when the electrical load of the unit (101) needs to be increased by 150MW, the opening of the second mixing valve (203) is opened to 30%, and 30% of the high temperature water flows into the low temperature return water of the long-distance transmission network after being mixed with the second return water pump (208) before flowing through the second water supply pump (206); When the unit (101) electrical load needs to be increased by 150MW, the bypass valve (204) of the pressure isolation station is opened to 40%, and 30% of the high-temperature water flows into the low-temperature return water of the long-distance transmission network before flowing through the pressure isolation heat exchanger (201) and mixing with the return water pump (209) of the pressure isolation station.

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