Regulation and control method for achieving dynamic heat storage and release and hydraulic stability of heat supply system

Abstract

The invention discloses a regulation and control method for achieving dynamic heat storage and release and hydraulic stability of a heat supply system. The regulation and control method comprises the steps that 1, a heat exchange system of an initial station and a heat exchange system of a heating station are built; 2, safety regulation and control are carried out on the heat supply amount of an initial station of the heat supply system; and 3, heat supply and demand balance regulation and control based on the primary side heat exchange electric regulating valve and constant pressure difference regulation and control based on the primary side bypass electric regulating valve are executed on a heating station of the heat supply system. Based on a heat exchange system of primary side bypass heat storage equipment, the regulation and control method of the heat supply system is provided, and common regulation of heat supply and demand balance regulation and control based on a primary side heat exchange electric regulation valve and constant pressure difference regulation and control based on a primary side bypass electric regulation valve is executed on a heating station; hydraulic decoupling and flexible storage and release of heat in an energy-saving building group and a primary heat supply network are achieved.

Description

Technical Field

[0001] The invention relates to the field of heating, and in particular to a control method for realizing dynamic heat storage and release and hydraulic stability of a heating system. Background Art

[0002] With the rapid development of renewable energy such as wind power and photovoltaics, the penetration rate of fluctuating power sources in regional power grids is increasing, which brings tremendous pressure to the supply and demand balance regulation of power grids. In order to achieve deep power peak regulation, the operation and regulation mode of thermal power plants has gradually changed from "determining electricity by heat" to "determining heat by electricity". Due to the coupling relationship between the thermal and electric output power of thermal power plants, the heat supply of power peak regulation thermal power plants will undergo large and high-frequency changes. In order to ensure the quality of heating for users, thermal power stations must perform corresponding local feedback control to effectively respond to the fluctuations in the water supply temperature of the primary network and maintain the balance of heat supply and demand for heating users.

[0003] Energy-saving buildings usually have good thermal insulation performance and high heat storage capacity. Using thermal power stations as units to perform dynamic heat storage and release control on energy-saving building groups can store excess heat in buildings when the heat supply is relatively excessive, and release the pre-stored heat when the heat supply is relatively insufficient. This method can significantly enhance the adaptability of the heating system to fluctuating heat supply, effectively improve the operational flexibility of thermal power plants, and promote the consumption of renewable energy.

[0004] However, due to the differences in heat storage characteristics and storage capacity of different energy-saving building complexes, when multiple energy-saving building complexes perform heat storage and release regulation at different times and with different regulation strategies, the hydraulic conditions of the primary network are reconstructed, and the pressure and flow distribution undergo complex changes. The heat transfer process of all thermal power stations is disturbed and affected to varying degrees. There is a strong coupling between the local regulation effects of the thermal power station, and the system control process is unstable and prone to oscillation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the technical problem that the present invention intends to solve is to provide a control method for achieving dynamic heat storage and release and hydraulic stability of a heating system.

[0006] The technical solution of the present invention to solve the technical problem is to provide a control method for realizing dynamic heat storage and release and hydraulic stability of a heating system, characterized in that the method comprises the following steps:

[0007] Step 1: Build the heat exchange system of the first station and the heat exchange system of the thermal power station;

[0008] The heat exchange system of the first station includes the steam pipeline of the heat exchanger of the first station, the condensate pipeline of the heat exchanger of the first station, the steam-water heat exchanger of the first station, the main circulation pump of the first station, the steam regulating valve of the primary side of the first station, the water supply temperature sensor of the primary side of the first station and the PLC controller of the first station;

[0009] The steam pipe of the heat exchanger at the first station is equipped with a steam regulating valve on the primary side of the first station; the return pipe on the primary side is equipped with a main circulation pump on the first station; the water supply pipe on the primary side is equipped with a water supply temperature sensor on the primary side of the first station; the PLC controller at the first station is connected to the steam regulating valve on the primary side of the first station and the water supply temperature sensor on the primary side of the first station;

[0010] The heat exchange system of the thermal power station includes a heat exchange unit of the thermal power station, a primary side heat exchange electric regulating valve, a primary side bypass electric regulating valve, a primary side heat storage bypass pipe, a secondary side circulation pump, a primary side pressure difference sensor, a thermal power station PLC controller, a secondary side water supply temperature sensor, a primary side water supply pipe, a primary side return pipe, a secondary side water supply pipe, a secondary side return pipe, a primary side high pressure end probe, a primary side low pressure end probe and an operation parameter input module;

[0011] A primary side high-pressure end probe is installed on the primary side water supply pipeline; a primary side heat exchange electric regulating valve and a primary side low-pressure end probe are installed on the primary side return pipeline in sequence according to the fluid flow direction; the starting end of the primary side heat storage bypass pipe is connected to the primary side water supply pipeline, and is located downstream of the primary side high-pressure end probe according to the fluid flow direction; the end of the primary side heat storage bypass pipe is connected to the primary side return pipeline, and is located between the primary side heat exchange electric regulating valve and the primary side low-pressure end probe; a primary side bypass electric regulating valve is installed on the primary side heat storage bypass pipe; a secondary side water supply temperature sensor is installed on the secondary side water supply pipeline; a secondary side circulation pump is installed on the secondary side return pipeline;

[0012] The primary side high pressure end probe and the primary side low pressure end probe are both connected to the primary side pressure difference sensor; the thermal power station PLC controller is connected to the primary side heat exchange electric regulating valve, the primary side bypass electric regulating valve, the primary side pressure difference sensor, the secondary side water supply temperature sensor and the operation parameter input module;

[0013] Step 2, performing safety control on the heating amount of the first station of the heating system;

[0014] The primary water supply temperature sensor at the first station collects the actual transmission temperature T of the heat medium in the primary water supply pipeline. g And transmit it to the first station PLC controller, the first station PLC controller according to the actual transmission temperature T of the first-level network g Control the opening of the steam regulating valve on the primary side of the first station, and then control the flow of high-temperature steam in the steam pipeline of the heat exchanger of the first station; during the whole process, the main circulation pump of the first station runs at a fixed frequency;

[0015] When the actual transport temperature of the primary network is T g >Maximum conveying temperature of primary network T g,max When the first station PLC controller is based on T g With T g,maxThe deviation is used to reduce the opening of the steam regulating valve on the primary side of the first station, thereby reducing the high-temperature steam flow input to the steam-water heat exchanger at the first station, so that T g,max -1℃≤T g ≤T g,max , to ensure the safe operation of the heating system;

[0016] When the actual transport temperature of the primary network is T g <Ensure the minimum transmission temperature T of the primary network to meet the heat load demand of the thermal power station g,ref When the first station PLC controller is based on T g With T g,ref The deviation is used to increase the opening of the steam regulating valve on the primary side of the first station, thereby increasing the high-temperature steam flow rate input to the steam-water heat exchanger at the first station, so that T g,ref ≤T g ≤T g,ref +1℃, ensuring that the heat supply can meet the heat demand;

[0017] When the minimum transmission temperature T of the primary network is guaranteed to meet the heat load demand of the thermal power station g,ref ≤Actual conveying temperature of primary network T g ≤Maximum conveying temperature of primary network T g,max When the steam regulating valve on the primary side of the first station is not regulated;

[0018] Step 3: performing heat supply and demand balance control based on the primary-side heat exchange electric regulating valve and constant pressure difference control based on the primary-side bypass electric regulating valve on the thermal power station of the heating system;

[0019] Working condition 1: For non-energy-saving thermal power stations, the following non-energy-saving thermal power station control methods are adopted:

[0020] The operating parameter input module calculates and generates the secondary side water supply temperature setting value t of the non-energy-saving thermal power station g,i,set and the primary side reference pressure difference ΔP of non-energy-saving thermal power station i,set and transmit it to the PLC controller of the heating station; the secondary side water supply temperature sensor collects the actual secondary side water supply temperature t of the non-energy-saving heating station in real time g,i , and transmit it to the PLC controller of the thermal power station; the primary side pressure difference sensor measures the primary side supply and return water pressure value of the non-energy-saving thermal power station in real time through the primary side high pressure end probe and the primary side low pressure end probe, and then obtains the primary side supply and return water pressure difference ΔP of the non-energy-saving thermal power station i and transmit it to the PLC controller of the thermal power station; the secondary side circulation pump runs at a fixed frequency; i is the number of the non-energy-saving thermal power station;

[0021] For non-energy-saving thermal power stations, heat supply and demand balance control refers to the thermal power station PLC controller according to t g,i With t g,i,setThe opening of the primary heat exchange electric regulating valve is adjusted by the deviation between ΔP. Constant pressure difference control refers to the PLC controller of the thermal power station adjusting the opening of the primary heat exchange electric regulating valve according to ΔP i With ΔP i,set The opening of the primary bypass electric regulating valve is adjusted according to the deviation;

[0022] Working condition 2: For energy-saving thermal power stations, the following energy-saving thermal power station control methods are adopted:

[0023] The operating parameter input module calculates and generates the secondary side water supply temperature setting value t of the energy-saving thermal power station g,j,set , Energy-saving thermal power station primary side reference pressure difference ΔP j,set and the heat storage water supply temperature of energy-saving buildings g,j,max and transmit it to the PLC controller of the heating station; the secondary side water supply temperature sensor collects the actual secondary side water supply temperature t of the energy-saving heating station in real time g,j , and transmit it to the PLC controller of the thermal power station; the primary side pressure difference sensor measures the primary side supply and return water pressure of the energy-saving thermal power station in real time through the primary side high pressure end probe and the primary side low pressure end probe, and then obtains the primary side supply and return water pressure difference ΔP of the energy-saving thermal power station j and transmit it to the PLC controller of the thermal power station; the secondary side circulation pump runs at a fixed frequency; j is the number of the energy-saving thermal power station;

[0024] For energy-saving thermal power stations, heat supply and demand balance control refers to the thermal power station PLC controller according to t g,j With t g,i,set and t g,j,max The opening of the primary heat exchange electric regulating valve is adjusted by the deviation between ΔP. Constant pressure difference control refers to the PLC controller of the thermal power station adjusting the opening of the primary heat exchange electric regulating valve according to ΔP j With ΔP j,set The opening of the primary side bypass electric regulating valve is adjusted according to the deviation.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention is based on a heat exchange system of a primary-side bypass heat storage device (i.e., a primary-side bypass electric regulating valve and a primary-side heat storage bypass pipe), and proposes a control method for a heating system. By jointly regulating the heat supply and demand balance control based on the primary-side heat exchange electric regulating valve and the constant pressure difference control based on the primary-side bypass electric regulating valve on the thermal power station, hydraulic decoupling and flexible storage and release of heat in energy-saving buildings and primary heating networks are achieved.

[0027] (2) The control method proposed in the present invention effectively solves the problem of reconstruction of the hydraulic conditions of the primary network caused by differences in heat storage characteristics and capacity when different energy-saving building groups perform heat storage and release control, avoids the complex changes in pressure and flow distribution when the thermal power station performs local control, and can maintain the pressure and flow distribution of the primary network transmission and distribution trunk line constant, realizing complete hydraulic decoupling between the local control effects of different thermal power stations. The control process is fast and stable, the actuator action frequency is low, and the expected working life is long.

[0028] (3) The present invention can dynamically and flexibly store the excess heat supply of the central heating system into the primary return water network by means of the primary side bypass heat storage device, so that the inherent heat storage capacity of the primary return water network is effectively utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the heat exchange system of the first station of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a heat exchange system based on a primary-side bypass heat storage device of a thermal power station of the present invention;

[0031] Figure 3 This is a schematic diagram of the internal structure of a heat exchange unit in a thermal power station according to an embodiment of the present invention;

[0032] In the figure, a heat exchange unit 1 of a thermal power station, a primary side heat exchange electric regulating valve 2, a primary side bypass electric regulating valve 3, a primary side heat storage bypass pipe 4, a secondary side circulation pump 5, a primary side pressure difference sensor 6, a thermal power station PLC controller 7, a secondary side water supply temperature sensor 8, a primary side water supply pipeline 9, a primary side return water pipeline 10, a secondary side water supply pipeline 11, a secondary side return water pipeline 12, a primary side high pressure end probe 13, a primary side low pressure end probe 14, an operation parameter input module 15, a thermal power station plate heat exchanger 16, a first station heat exchanger steam pipeline 17, a first station heat exchanger condensate pipeline 18, a first station steam-water heat exchanger 19, a first station main circulation pump 20, a first station primary side steam regulating valve 21, a first station primary side water supply temperature sensor 22, and a first station PLC controller 23. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the present invention.

[0034] The present invention provides a control method for realizing dynamic heat storage and release and hydraulic stability of a heating system (hereinafter referred to as the method), characterized in that the method comprises the following steps:

[0035] Step 1: Build the heat exchange system of the first station and the heat exchange system of the thermal power station;

[0036] The heat exchange system of the first station (such as Figure 1The first station heat exchanger includes a steam pipe 17, a condensate pipe 18, a steam-water heat exchanger 19, a main circulation pump 20, a primary side steam regulating valve 21, a primary side water supply temperature sensor 22 and a PLC controller 23;

[0037] The steam pipe 17 of the heat exchanger of the first station is equipped with a steam regulating valve 21 on the primary side of the first station; the return pipe 10 of the primary side is equipped with a main circulation pump 20 of the first station; the primary water supply pipe 9 of the first station is equipped with a water supply temperature sensor 22 on the primary side of the first station; the PLC controller 23 of the first station is connected to the steam regulating valve 21 on the primary side of the first station and the water supply temperature sensor 22 on the primary side of the first station;

[0038] All thermal power stations use a heat exchange system based on primary side bypass heat storage equipment (such as Figure 2 As shown), the heat exchange system of the thermal power station includes a thermal power station heat exchange unit 1, a primary side heat exchange electric regulating valve 2, a primary side bypass electric regulating valve 3, a primary side heat storage bypass pipe 4, a secondary side circulation pump 5, a primary side pressure difference sensor 6, a thermal power station PLC controller 7, a secondary side water supply temperature sensor 8, a primary side water supply pipeline 9, a primary side return water pipeline 10, a secondary side water supply pipeline 11, a secondary side return water pipeline 12, a primary side high pressure end probe 13, a primary side low pressure end probe 14 and an operation parameter input module 15;

[0039] A primary side high-pressure end probe 13 is installed on the primary side water supply pipe 9; a primary side heat exchange electric regulating valve 2 and a primary side low-pressure end probe 14 are installed on the primary side return water pipe 10 in sequence according to the fluid flow direction; the starting end of the primary side heat storage bypass pipe 4 is connected to the primary side water supply pipe 9, and is located downstream of the primary side high-pressure end probe 13 according to the fluid flow direction; the end of the primary side heat storage bypass pipe 4 is connected to the primary side return water pipe 10, and is located between the primary side heat exchange electric regulating valve 2 and the primary side low-pressure end probe 14; a primary side bypass electric regulating valve 3 is installed on the primary side heat storage bypass pipe 4; a secondary side water supply temperature sensor 8 is installed on the secondary side water supply pipe 11; a secondary side circulation pump 5 is installed on the secondary side return water pipe 12;

[0040] The primary side high pressure end probe 13 and the primary side low pressure end probe 14 are both connected to the primary side pressure difference sensor 6 for communication; the thermal power station PLC controller 7 is respectively connected to the primary side heat exchange electric regulating valve 2, the primary side bypass electric regulating valve 3, the primary side pressure difference sensor 6, the secondary side water supply temperature sensor 8 and the operation parameter input module 15 for communication;

[0041] Preferably, in step 1, the installation position of the side water supply temperature sensor 22 is as close as possible to the first station steam-water heat exchanger 19, the installation position of the secondary side water supply temperature sensor 8 is as close as possible to the thermal power station heat exchanger unit 1, the starting end of the primary side heat storage bypass pipe 4 is as close as possible to the primary side high-pressure end probe 13, and the end of the primary side heat storage bypass pipe 4 is as close as possible to the primary side low-pressure end probe 14, as close as possible, that is, close to it.

[0042] Preferably, in step 1, in the heat exchange system of the first station, the starting end of the steam pipe 17 of the first station heat exchanger is used for the entry of high-temperature steam, and the end of the steam pipe 17 of the first station heat exchanger is connected to the high-temperature steam inlet of the steam-water heat exchanger 19 of the first station; the condensate outlet of the steam-water heat exchanger 19 of the first station is connected to the starting end of the condensate pipe 18 of the heat exchanger of the first station, and the end of the condensate pipe 18 of the heat exchanger of the first station is used to output low-temperature condensate; the end of the primary side return water pipe 10 is connected to the low-temperature return water inlet of the steam-water heat exchanger 19 of the first station; the high-temperature water supply outlet of the steam-water heat exchanger 19 of the first station is connected to the starting end of the primary side water supply pipe 9;

[0043] During operation, high-temperature steam is transported from the first-station heat exchanger steam pipe 17 into the first-station steam-water heat exchanger 19, and becomes low-temperature condensate after releasing heat in the first-station steam-water heat exchanger 19, and is output from the first-station heat exchanger condensate pipe 18; the low-temperature return water in the primary-side return water pipe 10 is transported to the first-station steam-water heat exchanger 19 through the first-station main circulation pump 20, flows through the first-station steam-water heat exchanger 19 and absorbs the heat of the high-temperature steam, and is then transported to each thermal power station of the heating system through the primary-side water supply pipe 9.

[0044] Preferably, in step 1, in the heat exchange system of the thermal power station, the end of the primary water supply pipe 9 is connected to the primary heat medium inlet of the thermal power station heat exchanger unit 1; the starting end of the primary return water pipe 10 is connected to the primary heat medium outlet of the thermal power station heat exchanger unit 1; the starting end of the secondary water supply pipe 11 is connected to the secondary heat medium outlet of the thermal power station heat exchanger unit 1, and the end is used to output the secondary water supply heat medium; the end of the secondary return water pipe 12 is connected to the secondary heat medium inlet of the thermal power station heat exchanger unit 1, and the starting end is used to input the secondary return water heat medium.

[0045] Preferably, in step 1, the primary side heat exchange electric regulating valve 2 uses a regulating valve with equal percentage flow characteristics; the primary side bypass electric regulating valve 3 uses a regulating valve with fast opening flow characteristics.

[0046] Preferably, in step 1, the heat exchange unit 1 of the thermal power station is composed of a plurality of (preferably 1 to 4) heat exchangers (preferably the plate heat exchanger 16 of the thermal power station) connected in parallel. Figure 3As shown, the heat exchange unit 1 of the thermal power station is composed of two thermal power station plate heat exchangers 16 in parallel; the end of the primary side water supply pipe 9 is divided into two branches, which are respectively connected to the primary side heat medium inlets of the two thermal power station plate heat exchangers 16; the starting end of the primary side return water pipe 10 is divided into two branches, which are respectively connected to the primary side heat medium outlets of the two thermal power station plate heat exchangers 16; the starting end of the secondary side water supply pipe 11 is divided into two branches, which are respectively connected to the secondary side heat medium outlets of the two thermal power station plate heat exchangers 16; the end of the secondary side return water pipe 12 is divided into two branches, which are respectively connected to the secondary side heat medium inlets of the two thermal power station plate heat exchangers 16.

[0047] Step 2: Safety control of the heat supply of the first station of the heating system is a prerequisite for achieving supply and demand balance and constant pressure difference control of energy-saving heating stations or non-energy-saving heating stations;

[0048] The primary side water supply temperature sensor 22 of the first station collects the actual transmission temperature T of the primary network of the heat medium in the primary side water supply pipeline 9. g (i.e., the secondary side water supply temperature of the steam-water heat exchanger 19 at the first station) and transmitted to the first station PLC controller 23, which then calculates the actual water supply temperature T of the primary network. g Control the opening of the steam regulating valve 21 on the primary side of the first station, and then control the flow of high-temperature steam in the steam pipe 17 of the heat exchanger of the first station; during the whole process, the main circulation pump 20 of the first station runs at a fixed frequency;

[0049] When the actual transport temperature of the primary network is T g >Maximum conveying temperature of primary network T g,max When the first station PLC controller 23 is based on T g With T g,max The deviation is used to reduce the opening of the primary side steam regulating valve 21 of the first station, thereby reducing the high-temperature steam flow input to the steam-water heat exchanger 19 of the first station, so that T g,max -1℃≤T g ≤T g,max , to ensure the safe operation of the heating system;

[0050] When the actual transport temperature of the primary network is T g <Ensure the minimum transmission temperature T of the primary network to meet the heat load demand of the thermal power station g,ref When the first station PLC controller 23 is based on T g With T g,ref The deviation is used to increase the opening of the steam regulating valve 21 on the primary side of the first station, thereby increasing the high-temperature steam flow input to the steam-water heat exchanger 19 of the first station, so that T g,ref ≤T g ≤T g,ref +1℃, ensuring that the heat supply can meet the heat demand;

[0051] When the minimum transmission temperature T of the primary network is guaranteed to meet the heat load demand of the thermal power station g,ref ≤Actual conveying temperature of primary network T g ≤Maximum conveying temperature of primary network T g,max When the steam regulating valve 21 on the primary side of the first station is not regulated;

[0052] Step 3, performing heat supply and demand balance control based on the primary side heat exchange electric regulating valve 2 (referred to as heat supply and demand balance control) and constant pressure difference control based on the primary side bypass electric regulating valve 3 (referred to as constant pressure difference control) on the thermal power station of the heating system;

[0053] Working condition 1: For non-energy-saving thermal power stations (i.e., thermal power stations with heat exchange systems based on primary-side bypass heat storage equipment are non-energy-saving thermal power stations), the following non-energy-saving thermal power station control methods are adopted:

[0054] The operating parameter input module 15 calculates and generates the secondary side water supply temperature setting value t of the non-energy-saving thermal power station g,i,set and the primary side reference pressure difference ΔP of non-energy-saving thermal power station i,set , and transmit it to the thermal power station PLC controller 7; the secondary side water supply temperature sensor 8 collects the actual secondary side water supply temperature t of the non-energy-saving thermal power station in real time g,i , and transmit it to the thermal power station PLC controller 7; the primary side pressure difference sensor 6 respectively measures the primary side supply and return water pressure value of the non-energy-saving thermal power station through the primary side high pressure end probe 13 and the primary side low pressure end probe 14 in real time, and then obtains the primary side supply and return water pressure difference ΔP of the non-energy-saving thermal power station i and transmit it to the thermal power station PLC controller 7; the secondary side circulation pump 5 operates at a fixed frequency; i is the number of the non-energy-saving thermal power station;

[0055] For non-energy-saving thermal power stations, heat supply and demand balance control refers to the thermal power station PLC controller 7 according to t g,i With t g,i,set The opening of the primary heat exchange electric regulating valve 2 is adjusted by the deviation between ΔP. The constant pressure difference control refers to the thermal power station PLC controller 7 adjusting the opening of the primary heat exchange electric regulating valve 2 according to ΔP i With ΔP i,set The opening of the primary bypass electric regulating valve 3 is adjusted according to the deviation, specifically:

[0056] When t g,i >t g,i,set When t g,i Fall back to t g,i,set At this time, the ΔP measured by the primary side differential pressure sensor 6 is i Increase and exceed ΔP i,setThen the thermal power station PLC controller 7 issues a command to open or increase the opening of the primary side bypass electric regulating valve 3, and the flow rate of the heat medium in the primary side heat storage bypass pipe 4 increases, so that the ΔP measured by the primary side differential pressure sensor 6 i Back to ΔP i,set When the primary bypass electric regulating valve 3 is opened or the opening is increased, more heat medium flows directly into the primary return water pipe 10 without heat exchange, and the temperature of the heat medium in the primary return water pipe 10 increases, which is equivalent to storing heat in the primary return water network or increasing its heat storage capacity;

[0057] When t g,i =t g,i,set When , the openings of the primary side heat exchange electric regulating valve 2 and the primary side bypass electric regulating valve 3 remain unchanged;

[0058] When t g,i <t g,i,set When the PLC controller 7 of the thermal power station sends a command to increase the opening of the primary side heat exchange electric regulating valve 2, the heat medium flow through the thermal power station heat exchange unit 1 increases, so that t g,i Recover to t g,i,set At this time, the ΔP measured by the primary side differential pressure sensor 6 is i Reduce and below ΔP i,set Then the PLC controller 7 of the thermal power station sends an instruction to reduce or close the opening of the primary side bypass electric regulating valve 3, and the flow of the heat medium in the primary side heat storage bypass pipe 4 is reduced, so that the ΔP measured by the primary side differential pressure sensor 6 is i Return to ΔP i,set When the opening of the primary bypass electric regulating valve 3 is reduced or closed, the return water temperature of the heat medium in the primary return water pipe 10 is reduced, which is equivalent to releasing the heat stored in the primary pipe network or reducing the heat stored in the primary pipe network;

[0059] Working condition 2: For energy-saving thermal power stations (i.e., when the thermal power station with a heat exchange system based on primary-side bypass heat storage equipment is an energy-saving thermal power station), the following energy-saving thermal power station control method is adopted:

[0060] The operating parameter input module 15 calculates and generates the set value of the secondary side water supply temperature of the energy-saving thermal power station t g,j,set , Energy-saving thermal power station primary side reference pressure difference ΔP j,set and the heat storage water supply temperature of energy-saving buildings g,j,max and transmit it to the thermal power station PLC controller 7; the secondary side water supply temperature sensor 8 collects the actual secondary side water supply temperature t of the energy-saving thermal power station in real time g,j , and transmit it to the thermal power station PLC controller 7; the primary side pressure difference sensor 6 measures the primary side supply and return water pressure of the energy-saving thermal power station in real time through the primary side high pressure end probe 13 and the primary side low pressure end probe 14, and then obtains the primary side supply and return water pressure difference ΔP of the energy-saving thermal power stationj and transmit it to the thermal power station PLC controller 7; the secondary side circulation pump 5 operates at a fixed frequency; j is the energy-saving thermal power station number;

[0061] For energy-saving thermal power stations, heat supply and demand balance control refers to the thermal power station PLC controller 7 according to t g,j With t g,i,set and t g,j,max The opening of the primary heat exchange electric regulating valve 2 is adjusted by the deviation between ΔP. The constant pressure difference control refers to the thermal power station PLC controller 7 adjusting the opening of the primary heat exchange electric regulating valve 2 according to ΔP j With ΔP j,set The opening of the primary bypass electric regulating valve 3 is adjusted according to the deviation, specifically:

[0062] When t g,j <t g,j,set When the PLC controller 7 of the thermal power station sends a command to increase the opening of the primary side heat exchange electric regulating valve 2, the heat medium flow through the thermal power station heat exchange unit 1 increases, so that t g,j Recover to t g,j,set At this time, the ΔP measured by the primary side differential pressure sensor 6 is j Reduced and below ΔP j,set Then the PLC controller 7 of the thermal power station sends an instruction to reduce or close the opening of the primary side bypass electric regulating valve 3, and the flow of the heat medium in the primary side heat storage bypass pipe 4 is reduced, so that the ΔP measured by the primary side differential pressure sensor 6 is j Return to ΔP j,set When the primary bypass electric regulating valve 3 is closed or the opening is reduced, the return water temperature of the heat medium in the primary return water pipe 10 is reduced, which is equivalent to releasing the heat stored in the primary pipe network or reducing the heat stored in the primary pipe network;

[0063] When t g,j,set ≤t g,j ≤t g,j,max When t , the primary side heat exchange electric regulating valve 2 and the primary side bypass electric regulating valve 3 maintain their original working state without adjustment; at this time, the heat exchange capacity of the heat exchange unit 1 of the thermal power station increases, making t g,j Improved, users get more heat, indoor temperature rises, and the excess heat of the heating system is effectively stored in the energy-saving building complex;

[0064] When t g,j >t g,j,max When the PLC controller 7 of the thermal power station sends a command to reduce the opening of the primary side heat exchange electric regulating valve 2, the heat medium flow through the thermal power station heat exchange unit 1 is reduced, so that t g,j Fall back to t g,j,max At this time, the ΔP measured by the primary side differential pressure sensor 6 is j Increased and above ΔP j,setThen the PLC controller 7 of the thermal power station issues a command to open or increase the opening of the primary side bypass electric regulating valve 3, and the flow rate of the heat medium in the primary side heat storage bypass pipe 4 increases, so that the ΔP measured by the primary side differential pressure sensor 6 j Back to ΔP j,set When the primary side bypass electric regulating valve 3 is opened or the opening is increased, more heat medium flows directly into the primary side return pipe 10 without heat exchange, and the temperature of the heat medium in the primary side return pipe 10 increases, which is equivalent to storing heat in the primary return pipe network or increasing its heat storage capacity.

[0065] Preferably, in step 3, whether it is an energy-saving thermal power station or a non-energy-saving thermal power station, before and after heat supply and demand balance regulation and constant pressure difference regulation, the relevant operating parameters in the thermal power station satisfy the following equations:

[0066]

[0067] In formula (1), S p1 To adjust the impedance of the bypass electric regulating valve 3 on the previous side, Pa / (kg / s) 2 ; S p1 ' is the impedance of the primary bypass electric regulating valve 3 after regulation, Pa / (kg / s) 2 ; S t1 To adjust the impedance of the electric regulating valve 2 on the primary side, Pa / (kg / s) 2 ; S t1 ' is the impedance of the primary side heat exchange electric regulating valve 2 after regulation, Pa / (kg / s) 2 ; S h1 is the equivalent impedance of the primary side flow channel of the heat exchanger unit 1 of the thermal power station, Pa / (kg / s) 2 ; G h To regulate the primary side heat exchange flow rate of the heat exchange unit 1 of the front thermal power station, kg / s; G h ' is the heat exchange flow rate of the primary side of the heat exchange unit 1 of the thermal power station after regulation, kg / s; G p To regulate the flow rate of the heat storage bypass pipe 4 on the previous side, kg / s; G p ' is the flow rate of the primary side heat storage bypass pipe 4 after regulation, kg / s; ΔP1 is the primary side pressure difference of the heat exchanger unit 1 of the thermal power station before regulation, Pa; ΔP1' is the primary side pressure difference of the heat exchanger unit 1 of the thermal power station after regulation, Pa;

[0068] Therefore, the total primary side flow and primary side supply and return water pressure difference of each energy-saving thermal power station and non-energy-saving thermal power station remain unchanged before and after regulation, and have no effect on the flow and pressure of other thermal power stations, thus achieving decoupling of hydraulic regulation.

[0069] In the present invention, a heating building group that is connected to the same secondary heating pipeline network and heated by the same thermal power station and has a larger heat capacity is defined as an energy-saving building group; a heating building group that is connected to the same secondary heating pipeline network and heated by the same thermal power station and has a smaller heat capacity is defined as a non-energy-saving building group; a thermal power station that supplies heat to an energy-saving building group is defined as an energy-saving thermal power station; a thermal power station that supplies heat to a non-energy-saving building group is defined as a non-energy-saving thermal power station; the maximum secondary side water supply temperature that meets the comfortable room temperature of the energy-saving building group is defined as the heat storage water supply temperature of the energy-saving building group. If the temperature is higher than this temperature, the indoor temperature of the energy-saving building group will be too high, and the thermal comfort will decrease.

[0070] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A control method for realizing dynamic heat storage and release and hydraulic stability of a heating system, characterized in that: The method comprises the following steps: Step 1: Build the heat exchange system of the first station and the heat exchange system of the thermal power station; The heat exchange system of the first station includes a first station heat exchanger steam pipeline (17), a first station heat exchanger condensate pipeline (18), a first station steam-water heat exchanger (19), a first station main circulation pump (20), a first station primary side steam regulating valve (21), a first station primary side water supply temperature sensor (22) and a first station PLC controller (23); A first-station primary-side steam regulating valve (21) is installed on the first-station heat exchanger steam pipeline (17); a first-station main circulation pump (20) is installed on the primary-side return water pipeline (10); a first-station primary-side water supply temperature sensor (22) is installed on the primary-side water supply pipeline (9); a first-station PLC controller (23) is communicatively connected with the first-station primary-side steam regulating valve (21) and the first-station primary-side water supply temperature sensor (22); The heat exchange system of the heat power station comprises a heat exchange unit (1) of the heat power station, a primary side heat exchange electric regulating valve (2), a primary side bypass electric regulating valve (3), a primary side heat storage bypass pipe (4), a secondary side circulation pump (5), a primary side pressure difference sensor (6), a heat power station PLC controller (7), a secondary side water supply temperature sensor (8), a primary side water supply pipeline (9), a primary side return water pipeline (10), a secondary side water supply pipeline (11), a secondary side return water pipeline (12), a primary side high pressure end probe (13), a primary side low pressure end probe (14) and an operation parameter input module (15); A primary side high-pressure end probe (13) is installed on the primary side water supply pipeline (9); a primary side heat exchange electric regulating valve (2) and a primary side low-pressure end probe (14) are installed on the primary side return water pipeline (10) in sequence according to the fluid flow direction; the starting end of the primary side heat storage bypass pipe (4) is connected to the primary side water supply pipeline (9) and is located downstream of the primary side high-pressure end probe (13) according to the fluid flow direction; the end of the primary side heat storage bypass pipe (4) is connected to the primary side return water pipeline (10) and is located between the primary side heat exchange electric regulating valve (2) and the primary side low-pressure end probe (14); a primary side bypass electric regulating valve (3) is installed on the primary side heat storage bypass pipe (4); a secondary side water supply temperature sensor (8) is installed on the secondary side water supply pipeline (11); and a secondary side circulation pump (5) is installed on the secondary side return water pipeline (12); The primary side high pressure end probe (13) and the primary side low pressure end probe (14) are both communicatively connected to the primary side pressure difference sensor (6); the thermal power station PLC controller (7) is communicatively connected to the primary side heat exchange electric regulating valve (2), the primary side bypass electric regulating valve (3), the primary side pressure difference sensor (6), the secondary side water supply temperature sensor (8) and the operation parameter input module (15); Step 2, performing safety control on the heating amount of the first station of the heating system; The primary side water supply temperature sensor (22) of the first station collects the actual transport temperature T of the first network of the heat medium in the primary side water supply pipeline (9). g The PLC controller (23) at the first station transmits the actual transmission temperature T g Controlling the opening of the steam regulating valve (21) on the primary side of the first station, thereby controlling the flow of high-temperature steam in the steam pipeline (17) of the heat exchanger of the first station; during the whole process, the main circulation pump (20) of the first station operates at a fixed frequency; When the actual transport temperature of the primary network is T g >Maximum conveying temperature of primary network T g,max When T g With T g,max The deviation of T is used to reduce the opening of the primary side steam regulating valve (21) of the first station, thereby reducing the high-temperature steam flow input to the steam-water heat exchanger (19) of the first station, so that T g,max -1℃≤T g ≤T g,max , to ensure the safe operation of the heating system; When the actual transport temperature of the primary network is T g <Ensure the minimum transmission temperature T of the primary network to meet the heat load demand of the thermal power station g,ref When T g With T g,ref The deviation of T is used to increase the opening of the primary side steam regulating valve (21) of the first station, thereby increasing the high-temperature steam flow rate input to the steam-water heat exchanger (19) of the first station, so that T g,ref ≤T g ≤T g,ref +1℃, ensuring that the heat supply can meet the heat demand; When the minimum transmission temperature T of the primary network is guaranteed to meet the heat load demand of the thermal power station g,ref ≤Actual conveying temperature of primary network T g ≤Maximum conveying temperature of primary network T g,max When the steam regulating valve (21) on the primary side of the first station is not regulated; Step 3, performing heat supply and demand balance control based on the primary side heat exchange electric regulating valve (2) and constant pressure difference control based on the primary side bypass electric regulating valve (3) on the thermal power station of the heating system; Working condition 1: For non-energy-saving thermal power stations, the following non-energy-saving thermal power station control methods are adopted: The operating parameter input module (15) calculates and generates the secondary side water supply temperature setting value t of the non-energy-saving thermal power station. g,i,set and the primary side reference pressure difference ΔP of non-energy-saving thermal power station i,set and transmits it to the thermal power station PLC controller (7); the secondary side water supply temperature sensor (8) collects the actual secondary side water supply temperature t of the non-energy-saving thermal power station in real time g,i and transmits it to the thermal power station PLC controller (7); the primary side pressure difference sensor (6) respectively measures the primary side supply and return water pressure value of the non-energy-saving thermal power station in real time through the primary side high pressure end probe (13) and the primary side low pressure end probe (14), thereby obtaining the primary side supply and return water pressure difference ΔP of the non-energy-saving thermal power station i and transmits it to the thermal power station PLC controller (7); the secondary side circulation pump (5) operates at a fixed frequency; i is the number of the non-energy-saving thermal power station; For non-energy-saving thermal power stations, heat supply and demand balance control refers to the thermal power station PLC controller (7) according to t g,i With t g,i,set The opening of the primary heat exchange electric regulating valve (2) is adjusted by the deviation between ΔP. The constant pressure difference control refers to the thermal power station PLC controller (7) adjusting the opening of the primary heat exchange electric regulating valve (2) according to ΔP i With ΔP i,set The opening of the primary bypass electric regulating valve (3) is adjusted according to the deviation; Working condition 2: For energy-saving thermal power stations, the following energy-saving thermal power station control methods are adopted: The operating parameter input module (15) calculates and generates the secondary side water supply temperature setting value t of the energy-saving thermal power station. g,j,set , Energy-saving thermal power station primary side reference pressure difference ΔP j,set and the heat storage water supply temperature of energy-saving buildings g,j,max and transmits it to the PLC controller (7) of the heating station; the secondary side water supply temperature sensor (8) collects the actual secondary side water supply temperature t of the energy-saving heating station in real time g,j and transmits it to the PLC controller (7) of the thermal power station; the primary side pressure difference sensor (6) respectively measures the primary side supply and return water pressure of the energy-saving thermal power station in real time through the primary side high pressure end probe (13) and the primary side low pressure end probe (14), thereby obtaining the primary side supply and return water pressure difference ΔP of the energy-saving thermal power station j and transmits it to the thermal power station PLC controller (7); the secondary side circulation pump (5) operates at a fixed frequency; j is the energy-saving thermal power station number; For energy-saving thermal power stations, heat supply and demand balance control refers to the thermal power station PLC controller (7) according to t g,j With t g,i,set and t g,j,max The opening of the primary heat exchange electric regulating valve (2) is adjusted by the deviation between ΔP. The constant pressure difference control refers to the thermal power station PLC controller (7) adjusting the opening of the primary heat exchange electric regulating valve (2) according to ΔP j With ΔP j,set The opening of the primary bypass electric regulating valve (3) is adjusted according to the deviation.

2. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 1, the installation position of the secondary water supply temperature sensor (22) is as close as possible to the first station steam-water heat exchanger (19), the installation position of the secondary water supply temperature sensor (8) is as close as possible to the heat exchange unit (1) of the thermal power station, the starting end of the primary side heat storage bypass pipe (4) is as close as possible to the primary side high-pressure end probe (13), and the end of the primary side heat storage bypass pipe (4) is as close as possible to the primary side low-pressure end probe (14).

3. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1 is characterized in that: In step 1, in the heat exchange system of the first station, the starting end of the steam pipe (17) of the first station heat exchanger is used for the entry of high-temperature steam, and the end of the steam pipe (17) of the first station heat exchanger is connected to the high-temperature steam inlet of the first station steam-water heat exchanger (19); the condensate outlet of the first station steam-water heat exchanger (19) is connected to the starting end of the condensate pipe (18) of the first station heat exchanger, and the end of the condensate pipe (18) of the first station heat exchanger is used to output low-temperature condensate; the end of the primary side return water pipe (10) is connected to the low-temperature return water inlet of the first station steam-water heat exchanger (19); the high-temperature water supply outlet of the first station steam-water heat exchanger (19) is connected to the starting end of the primary side water supply pipe (9); During operation, high-temperature steam is transported from the steam pipe (17) of the first station heat exchanger to the steam-water heat exchanger (19) of the first station, and is converted into low-temperature condensate after releasing heat in the steam-water heat exchanger (19) of the first station, and is output from the condensate pipe (18) of the first station heat exchanger; the low-temperature return water in the primary side return water pipe (10) is transported to the steam-water heat exchanger (19) of the first station through the main circulation pump (20) of the first station, flows through the steam-water heat exchanger (19) of the first station and absorbs the heat of the high-temperature steam, and is then transported to each thermal power station of the heating system through the primary side water supply pipe (9).

4. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 1, in the heat exchange system of the thermal power station, the end of the primary side water supply pipe (9) is connected to the primary side heat medium inlet of the thermal power station heat exchange unit (1); the starting end of the primary side return water pipe (10) is connected to the primary side heat medium outlet of the thermal power station heat exchange unit (1); the starting end of the secondary side water supply pipe (11) is connected to the secondary side heat medium outlet of the thermal power station heat exchange unit (1), and the end is used to output the secondary water supply heat medium; the end of the secondary side return water pipe (12) is connected to the secondary side heat medium inlet of the thermal power station heat exchange unit (1), and the starting end is used to input the secondary return water heat medium.

5. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 1, the primary side heat exchange electric regulating valve (2) uses a regulating valve with equal percentage flow characteristics; the primary side bypass electric regulating valve (3) uses a regulating valve with fast opening flow characteristics.

6. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 1, the heat exchange unit (1) of the thermal power station is composed of a plurality of heat exchangers connected in parallel.

7. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 3, for non-energy-saving thermal power stations, the heat supply and demand balance control and constant pressure difference control are specifically: When t g,i >t g,i,set When t g,i Fall back to t g,i,set At this time, the ΔP measured by the primary side differential pressure sensor (6) is i Increase and exceed ΔP i,set Then the PLC controller (7) of the thermal power station sends a command to open or increase the opening of the primary side bypass electric regulating valve (3), and the flow rate of the heat medium in the primary side heat storage bypass pipe (4) increases, so that the ΔP measured by the primary side differential pressure sensor (6) i Back to ΔP i,set When the primary side bypass electric regulating valve (3) is opened or the opening degree is increased, more heat medium flows directly into the primary side return water pipe (10) without heat exchange, and the temperature of the heat medium in the primary side return water pipe (10) increases, which is equivalent to storing heat in the primary return water pipe network or increasing its heat storage capacity; When t g,i =t g,i,set When the opening of the primary side heat exchange electric regulating valve (2) and the primary side bypass electric regulating valve (3) remain unchanged; When t g,i <t g,i,set When t g,i Recover to t g,i,set At this time, the ΔP measured by the primary side differential pressure sensor (6) is i Reduce and below ΔP i,set Then, the PLC controller (7) of the thermal power station sends a command to reduce or close the opening of the primary side bypass electric regulating valve (3), and the flow rate of the heat medium in the primary side heat storage bypass pipe (4) is reduced, so that the ΔP measured by the primary side differential pressure sensor (6) i Return to ΔP i,set When the opening of the primary side bypass electric regulating valve (3) is reduced or closed, the return water temperature of the heat medium in the primary side return water pipe (10) is reduced, which is equivalent to releasing the heat stored in the primary pipe network or reducing the heat stored in the primary pipe network.

8. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 3, for the energy-saving thermal power station, the heat supply and demand balance control and constant pressure difference control are specifically: When t g,j <t g,j,set When t g,j Recover to t g,j,set At this time, the ΔP measured by the primary side differential pressure sensor (6) is j Reduced and below ΔP j,set Then, the PLC controller (7) of the thermal power station sends a command to reduce or close the opening of the primary side bypass electric regulating valve (3), and the flow rate of the heat medium in the primary side heat storage bypass pipe (4) is reduced, so that the ΔP measured by the primary side differential pressure sensor (6) j Return to ΔP j,set When the primary side bypass electric regulating valve (3) is closed or the opening is reduced, the return water temperature of the heat medium in the primary side return water pipe (10) is reduced, which is equivalent to releasing the heat stored in the primary pipe network or reducing the heat stored in the primary pipe network; When t g,j,set ≤t g,j ≤t g,j,max , the primary side heat exchange electric regulating valve (2) and the primary side bypass electric regulating valve (3) maintain their original working state and are not adjusted; at this time, the heat exchange capacity of the heat exchange unit (1) of the thermal power station increases, so that t g,j Improved, users get more heat, indoor temperature rises, and the excess heat of the heating system is effectively stored in the energy-saving building complex; When t g,j >t g,j,max When t g,j Fall back to t g,j,max At this time, the ΔP measured by the primary side differential pressure sensor (6) is j Increased and above ΔP j,set Then, the PLC controller (7) of the thermal power station sends a command to open or increase the opening of the primary side bypass electric regulating valve (3), and the flow rate of the heat medium in the primary side heat storage bypass pipe (4) increases, so that the ΔP measured by the primary side differential pressure sensor (6) j Back to ΔP j,set When the primary side bypass electric regulating valve (3) is opened or the opening degree increases, more heat medium flows directly into the primary side return water pipe (10) without heat exchange, and the temperature of the heat medium in the primary side return water pipe (10) increases, which is equivalent to storing heat in the primary return water pipe network or increasing its heat storage capacity.

9. The control method for realizing dynamic heat storage and release and hydraulic stability of a heating system according to claim 1, characterized in that: In step 3, whether it is an energy-saving thermal power station or a non-energy-saving thermal power station, before and after heat supply and demand balance regulation and constant pressure difference regulation, the relevant operating parameters in the thermal power station satisfy the following equations: In formula (1), S p1 To adjust the impedance of the bypass electric regulating valve (3) on the previous side; S p1 ' is the impedance of the primary bypass electric regulating valve (3) after regulation; S t1 is to adjust the impedance of the heat exchange electric regulating valve (2) on the front primary side; S t1 ' is the impedance of the primary side heat exchange electric regulating valve (2) after regulation; S h1 G is the equivalent impedance of the primary side flow channel of the heat exchange unit (1) of the thermal power station; h To regulate the primary side heat exchange flow of the heat exchange unit (1) of the front thermal power station; G h ' is the heat exchange flow rate of the primary side of the heat exchange unit (1) of the thermal power station after regulation; G p To regulate the flow rate of the heat storage bypass pipe (4) on the previous primary side; G p 'To regulate the flow of the heat storage bypass pipe (4) on the rear primary side; ΔP1 is the primary side pressure difference of the heat exchange unit (1) of the thermal power station before regulation; ΔP1' is the primary side pressure difference of the heat exchange unit (1) of the thermal power station after regulation.

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