Balanced flow control method for heating secondary pipe network

Abstract

The application discloses a heat supply secondary pipe network balanced flow regulation method, which comprises the following steps: S1, dividing different unit heat supply areas; S2, heat supply system transformation; S3, measuring the actual heat supply flow parameters in the minimum unit heat supply area through experiments, the target heat supply flow parameters are smaller than the actual heat supply flow parameters, a first heat supply plan is adopted, and the target heat supply flow parameters are greater than the actual heat supply flow parameters, a second heat supply plan is adopted; and S4, the outlet pipe of the unit heat supply area is communicated with a circulating pump through a backflow pipe network, and the circulating pump is used to pump the flowing medium in the backflow pipe to a heat exchange station. According to the different user quantities, the linear branch pipe, the ring type branch pipe and the ring type branch pipe can be selected and used for different unit heat supply areas, the heat supply path of the branch pipe network is shortened, the problem that the increase or decrease of users in the system leads to hydraulic disorder is solved, the opening degree of the valve is adjusted by the flow controller in real time according to the feedback data, and the balanced pipe network flow is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of central heating, in particular to a method for regulating the balanced flow of a secondary pipe network of central heating. BACKGROUND

[0002] A central heating pipe network is a complex fluid network system, and its hydraulic balance is crucial, determining the effectiveness of system operation. It not only saves resources, but also is an important link to achieve safe and reliable central heating and improve the level of central heating. The central heating pipe network is divided into a primary pipe network and a secondary pipe network. Most central heating enterprises have invested a lot of funds and experience in the safe operation and transmission and distribution regulation of the primary pipe network, so that the pipe network equipment and operation management level have been greatly developed and improved. However, in the secondary pipe network of central heating, which is more extensive and sensitive and complex, the problem of hydraulic imbalance is still common and difficult to balance.

[0003] In the prior art, patent application No. 201911015963.8 discloses an intelligent balance regulation system and method for urban central heating pipe network, which separates the regulation of the primary pipe network and the secondary pipe network. The regulation of the primary pipe network is realized by the return water temperature of the primary pipe network, and the regulation of the secondary pipe network is realized by the secondary water supply temperature. When the secondary network water supply temperature demand changes, it does not affect the hydraulic working condition of the primary network, ensuring the stability of the hydraulic working condition of the primary network, realizing the decoupling operation of the primary pipe network and the secondary pipe network, and solving the problem of hydraulic imbalance of the primary pipe network and the secondary pipe network. Patent application No. 201910522533.9 discloses a variable flow regulation method and system for secondary side circulating pumps of heat exchange stations, which uses the secondary side target control flow corresponding to the outdoor average temperature as the basis for regulating the flow of the secondary side circulating pump, so that the regulation range of the secondary side circulating pump is small, and frequent fluctuations of the flow of the secondary side circulating pump are avoided.

[0004] In the actual application process, due to the increase or decrease of users in the system, it is required to redistribute the flow of each pipe section, thereby causing hydraulic imbalance. If the balanced flow of the secondary pipe network of central heating cannot be well regulated, it will cause problems such as excessively high temperature at the front end and insufficient heat at the end, affecting normal use. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and a method for regulating the balanced flow of a secondary pipe network of central heating is provided.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The method for regulating the balanced flow of a secondary pipe network of central heating comprises the following steps:

[0008] S1, according to the actual geographical conditions, different unit heating areas are divided, user data of the unit heating area is obtained, and target heating flow parameters of different levels are determined by taking different numbers of users as references;

[0009] S2, the heating system is reconstructed, the heating system comprises a primary pipe network, a secondary pipe network, a heat exchange station, a backflow pipe network and a circulating pump, the secondary pipe network comprises a main pipe and a branch pipe network;

[0010] The inlet pipe of the unit heating area is communicated with the main pipe through the branch pipe network, and the control valve and the flow sensor are installed in series in the branch pipe network, and the control valve and the flow sensor are electrically connected with the flow controller;

[0011] S3, the actual heating flow parameters in the minimum unit heating area are measured through experiments, the target heating flow parameters are less than the actual heating flow parameters, and the first heating plan is adopted, and the target heating flow parameters are greater than the actual heating flow parameters, and the second heating plan is adopted;

[0012] S4, the outlet pipe of the unit heating area is communicated with the circulating pump through the backflow pipe network, and the circulating pump is finally used to pump the flowing medium in the backflow pipe to the heat exchange station and back to the main pipe;

[0013] S5, the heating system is further provided with a water supplement tank and a water supplement pump, and the medium in the water supplement tank is delivered to the backflow pipe through the water supplement pump.

[0014] Preferably, the branch pipe network comprises straight branch pipes, ring type branch pipes and star type branch pipes, and the straight branch pipes, the ring type branch pipes and the star type branch pipes are sequentially selected according to the increase of the number of users in the unit heating area, the straight branch pipes are provided with one communication channel with the main pipe, the ring type branch pipes are provided with two communication channels with the main pipe, and the star type branch pipes are provided with three communication channels with the main pipe.

[0015] Preferably, the first heating plan refers to that one main pipe, straight branch pipes, ring type branch pipes and star type branch pipes are provided, and the straight branch pipes, the ring type branch pipes and the star type branch pipes are communicated with the main pipe through one or two communication channels respectively, and the heat source supplied by the heat exchange station is delivered to the straight branch pipes, the ring type branch pipes and the star type branch pipes through the one main pipe, and finally delivered to the users.

[0016] Preferably, the second heating plan refers to that two main pipes are provided, the other communication channels of the star type branch pipes are communicated with the second main pipe, and the heat source supplied by the heat exchange station is delivered to the straight branch pipes, the ring type branch pipes and the star type branch pipes through the two main pipes, and finally delivered to the users.

[0017] Preferably, the flow sensor detects the real-time flow parameter of the branch pipe network, the real-time flow parameter is compared with the actual heating flow parameter, a comparison feedback signal is transmitted to the flow controller, and the opening degree of the control valve is adjusted by the flow controller;

[0018] If the real-time flow parameter is less than or equal to the actual heating flow parameter, the control valve is opened by the flow controller;

[0019] If the real-time flow parameter is greater than the actual heating flow parameter, the control valve is closed by the flow controller, and a fault warning signal is sent to the control center by the flow controller.

[0020] Preferably, the number of users in the unit heating area includes the number of in-use users and the number of non-use users, the number of in-use users is calculated by the real-time flow parameter, when the number of in-use users increases, the real-time flow parameter increases, and the opening valve ratio is determined according to the ratio of the real-time flow parameter and the actual heating flow parameter; when the number of non-use users increases, the real-time flow parameter decreases, and the closing valve ratio is determined according to the ratio of the real-time flow parameter and the actual heating flow parameter.

[0021] The present application has the following beneficial effects:

[0022] 1. The heating secondary pipe network balanced flow control method provided by the present application sets different forms of branch pipe networks, wherein, according to different user quantities, straight-line branch pipes, ring-type branch pipes and ring-type branch pipes are selected for use in different unit heating areas, the heating path of the branch pipe network is shortened, the problem of hydraulic imbalance caused by the increase or decrease of users in the system is solved, and the opening degree of the control valve is adjusted by the flow controller to receive feedback data in real time, so as to realize balanced pipe network flow.

[0023] 2. The heating secondary pipe network balanced flow control method provided by the present application sets two main pipes, so that the heating pipe network can realize a one-level heating plan or a two-level heating plan, can switch to a two-level heating plan in the case that the number of users in the unit heating area is large, ensures that the heating demand of the end user can be met, and does not affect the front-end user, and the heating pipe network formed by the double main pipes can effectively avoid the heat stop accident caused by blockage or failure, and is more reliable and safe to use. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 The system schematic diagram of the heating secondary pipe network balanced flow control method provided by the present application;

[0025] Fig. 2 The flowchart of the heating secondary pipe network balanced flow control method provided by the present application.

[0026] In the figure: 1 main pipeline, 2 branch pipeline network, 3 return pipe network, 4 straight branch pipe, 5 ring type branch pipe, 6 communication passage, 7 control valve, 8 flow sensor, 9 star type branch pipe. Embodiments

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. Embodiments

[0029] Reference Figs. 1-2 , the heat supply secondary pipe network balanced flow control method, comprising:

[0030] S1, according to the actual geographical conditions, different unit heating areas are divided, and unit heating area user data is obtained, taking a single building (building 1# / building 2# / building 3#) as a unit heating area, or, according to the edge house and top house as a unit heating area, the middle house and bottom house as a unit heating area, taking different number of users as reference, determine different levels of target heating flow parameters, that is, the total heating flow required for normal operation of all radiators in the unit heating area;

[0031] S2, the transformation of the heat supply system, the heat supply system includes primary pipe network, secondary pipe network, heat exchange station, return pipe network 3 and circulating pump, the secondary pipe network includes main pipeline 1 and branch pipeline network 2; the branch pipeline network 2 includes straight branch pipe 4 and ring type branch pipe 5, according to the increase of the number of users in the unit heating area, the straight branch pipe 4 and the ring type branch pipe 5 are selected in turn, the straight branch pipe 4 is provided with a communication passage 6 with the main pipeline 1, and the ring type branch pipe 5 is provided with two communication passages 6 with the main pipeline 1.

[0032] The inlet pipe of the unit heating area is communicated with the main pipeline 1 through the branch pipeline network 2, and the control valve 7 and the flow sensor 8 are installed in series in the branch pipeline network 2, and the control valve 7 and the flow sensor 8 are electrically connected with the flow controller;

[0033] S3, the actual heat supply flow parameter in the minimum unit heating area is measured by experiment, the target heat supply flow parameter is less than the actual heat supply flow parameter, and a first heat supply plan is adopted, the first heat supply plan refers to setting one main pipeline 1, straight type branch pipes 4 and ring type branch pipes 5, which are communicated with the main pipeline 1 through one or two communication channels respectively, the heat source supplied by the heat exchange station is delivered to the straight type branch pipes 4 and the ring type branch pipes 5 through the main pipeline 1, and finally delivered to the user;

[0034] S4, the outlet pipe of the unit heating area is communicated with the circulating pump through the return pipe network 3, and finally the circulating pump pumps the flowing medium in the return pipe network 3 to the heat exchange station and returns to the main pipeline 1.

[0035] S5, the heating system is also provided with a water supplement tank and a water supplement pump, and the medium in the water supplement tank is delivered to the return pipe network 3 through the water supplement pump.

[0036] In the embodiment, the flow sensor 8 detects the real-time flow parameter of the branch pipe network 2, and the real-time flow parameter is compared with the actual heat supply flow parameter, and the comparison feedback signal is transmitted to the flow controller, and the opening degree of the control valve 7 is adjusted through the flow controller;

[0037] If the real-time flow parameter is less than or equal to the actual heat supply flow parameter, the control valve 7 is opened through the flow controller;

[0038] If the real-time flow parameter is greater than the actual heat supply flow parameter, the control valve 7 is closed through the flow controller, and a fault warning signal is sent to the control center through the flow controller.

[0039] The number of users in the unit heating area includes the number of in-use users and the number of non-use users, the number of in-use users is calculated by judging the real-time flow parameter, when the number of in-use users increases, the real-time flow parameter increases, and the opening valve ratio is determined according to the ratio of the real-time flow parameter and the actual heat supply flow parameter; when the number of non-use users increases, the real-time flow parameter decreases, and the closing valve ratio is determined according to the ratio of the real-time flow parameter and the actual heat supply flow parameter.

[0040] When heating starts, the average return water temperature of each subarea is calculated, the average return water temperature of the side house and the top house is added to the compensation value to obtain the comparison temperature of the subarea, and the average return water temperature of the middle house and the bottom house is subtracted from the compensation value to obtain the comparison temperature of the subarea.

[0041] The intelligent valve of the heat user (with flow regulation and return water temperature collection functions) is automatically opened, the return water temperature of all heat users, the indoor temperature of the typical user, and the supply and return water pressure difference between the nearest end and the farthest end of the heat exchange station are collected.

[0042] According to the comparison temperature, the intelligent valve gear of the user is adjusted, so that the return water temperature of the user in the subarea is basically consistent with the comparison temperature, and after each adjustment is completed, whether the indoor temperature of the typical user is basically consistent, and if the indoor temperatures of all users are basically consistent, the adjustment is completed. After the adjustment is completed, the return water pressure difference of the comparison heat exchange station is adjusted again, and if the pressure difference is basically consistent, it is indicated that the flow of the secondary pipe network system is also balanced.

[0043] In the embodiment, different forms of branch pipe networks 2 are arranged, wherein, according to the different number of users, the linear branch pipes 4, the ring type branch pipes 5 are selected and used in different unit heating areas, the heating path of the branch pipe network 2 is shortened, the problem that the increase or decrease of the users in the system causes the hydraulic disorder is solved, the opening degree of the valve 7 is adjusted by the flow controller in real time to receive feedback data, so as to balance the flow of the pipe network. Embodiment

[0044] Reference Figs. 1-2 Different from the embodiment 1, the step S2, the branch pipe network 2 further comprises a star type branch pipe 9, the star type branch pipe 9 is provided with at least three communication channels 6 with the main pipe 1, according to the increase of the number of users in the unit heating area, the linear branch pipe 4, the ring type branch pipe 5 and the star type branch pipe 9 are selected and used in sequence;

[0045] In the step S3, the actual heating flow parameter in the minimum unit heating area is measured by experiment, the target heating flow parameter is greater than the actual heating flow parameter, and the secondary heating plan is adopted; the secondary heating plan refers to that two main pipes 1 are arranged, the other communication channels 6 of the star type branch pipe 9 are communicated with the second main pipe 1, the heat source supplied by the heat exchange station is delivered to the linear branch pipe 4, the ring type branch pipe 5 and the star type branch pipe 9 through the two main pipes 1, and finally delivered to the user.

[0046] In the embodiment, the two main pipes 1 are arranged, so that the heating pipe network can realize the primary heating plan or the secondary heating plan, in the case that the number of users in the unit heating area is relatively large, the secondary heating plan can be switched to, the heating demand of the end user is ensured to be met, and the front end user is not affected, the heating pipe network formed by the double main pipes 1 can effectively avoid the heat stop accident caused by the blockage or failure, and is more reliable and safe in use.

[0047] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A method for controlling the balanced flow of a secondary heating pipe network, characterized in that: include: S1. Divide different unit heating areas according to actual geographical conditions, obtain user data of the unit heating areas, and determine target heating flow parameters of different levels based on different numbers of users; S2. Renovation of the heating system, which includes a primary pipe network, a secondary pipe network, a heat exchange station, a return pipe network, and a circulation pump. The secondary pipe network includes a main pipe network and a branch pipe network. The inlet pipes of the unit heating area are connected to the main pipe through the branch pipe network, and the branch pipe network is installed in series with a control valve and a flow sensor, and the control valve and flow sensor are both connected to the flow controller with electrical signals; The branch pipe network includes straight branch pipes, ring branch pipes and star branch pipes. According to the increase in the number of users in the unit heating area, the straight branch pipes, ring branch pipes and star branch pipes are selected in turn. The straight branch pipes are provided with one communication channel with the main pipe, the ring branch pipes are provided with two communication channels with the main pipe, and the star branch pipes are provided with at least three communication channels with the main pipe. S3. After experimentally measuring the actual heating flow parameters within the minimum unit heating area, if the target heating flow parameters are smaller than the actual heating flow parameters, the first-level heating plan is adopted; if the target heating flow parameters are larger than the actual heating flow parameters, the second-level heating plan is adopted; The primary heating plan is to set up a main pipeline, straight branch pipes, ring branch pipes and star branch pipes, each of which is connected to the main pipeline through one or two connecting channels. The heat source supplied by the heat exchange station is transported to the straight branch pipes, ring branch pipes and star branch pipes through the main pipeline, and finally delivered to the user; The secondary heating plan is to set up two main pipelines, the star-shaped branch pipe is connected to the second main pipeline through a connecting channel, and the heat source supplied by the heat exchange station is transported to the linear branch pipe, the ring branch pipe and the star branch pipe through the two main pipelines, and finally delivered to the user; S4. The outlet pipes of the unit heating area are connected to the circulation pump through the return pipe network, and the circulating pump finally pumps the flowing medium in the return pipe network to the heat exchange station and returns it to the main pipeline; S5. The heating system is also provided with a water supply tank and a water supply pump, through which the medium in the water supply tank is transported to the return pipe.

2. The method for controlling the balanced flow of a secondary heating pipe network according to claim 1, characterized in that: The flow sensor detects the real-time flow parameters of the branch pipe network, compares the real-time flow parameters with the actual heating flow parameters, and transmits the comparison feedback signal to the flow controller, which adjusts the opening and closing degree of the control valve through the flow controller; If the real-time flow parameter is less than or equal to the actual heating flow parameter, the flow controller is used to adjust the control valve to open; If the real-time flow parameter is greater than the actual heating flow parameter, the flow controller adjusts the control valve to close, and sends a fault warning signal to the control center through the flow controller.

3. The method for controlling the balanced flow of a secondary heating pipe network according to claim 2, characterized in that: The number of users in the unit heating area includes the number of active users and the number of inactive users. The number of active users is determined and calculated based on the real-time flow parameter. When the number of active users increases, the real-time flow parameter increases, and the valve opening ratio is determined based on the ratio of the real-time flow parameter to the actual heating flow parameter. When the number of disabled users increases, the real-time flow parameter decreases, and the valve closing ratio is determined based on the ratio of the real-time flow parameter to the actual heating flow parameter.

Images