Courtyard pipe network heat supply system and hydraulic balancing method

Abstract

Provided are a courtyard pipe network heat supply system and a hydraulic balancing method therefor. The heat supply system comprises: a first circulating water pump, wherein a water outlet of the first circulating water pump is connected to a water inlet of a heat consumer by means of a plate heat exchanger, and a water inlet of the first circulating water pump is connected to a water outlet of the heat consumer by means of a filter; and a second circulating water pump, wherein a water outlet of the second circulating water pump is directly connected to the water inlet of the heat consumer, a water inlet of the second circulating water pump is connected to the water outlet of the heat consumer by means of a filter, and the second circulating water pump is used for increasing the circulating flow.

Description

A courtyard pipe network heating system and hydraulic balancing method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on January 8, 2024, with application number 202410028649.8 and invention name “A courtyard pipe network heating system and hydraulic balancing method”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of heating technology, and in particular to a courtyard pipe network heating system and a hydraulic balancing method. Background Art

[0004] With the improvement of people's quality of life, large-scale centralized heating has been greatly developed. However, during the heating process, users often complain that the indoor temperature is not warm enough and does not meet the standard requirement of 18°C, and the courtyard pipe network is inconvenient to transform. In order to reduce the complaint rate of heating, it is necessary to eliminate hydraulic imbalance. How to eliminate hydraulic imbalance is one of the topics of concern to heating companies.

[0005] At present, many heat exchange stations have different degrees of hydraulic imbalance on site. Due to the aging of the courtyard pipe network and the lack of flow regulating valve equipment, hydraulic imbalance such as near-end overheating and far-end overcooling occurs. In order to solve the problem, it is necessary to transform the courtyard pipe network and add flow regulating valves. However, the cost of transforming the courtyard pipe network is high and the construction is difficult.

[0006] In order to solve the hydraulic imbalance problem of heating companies and reduce the heating complaint rate, there is an urgent need for a heating system that can effectively alleviate the hydraulic imbalance of the heating courtyard pipe network.

[0007] Summary of the Invention

[0008] Therefore, the technical problem to be solved by this application is to overcome the problems of high cost and difficulty in the existing technology.

[0009] To solve the above technical problems, the present application provides a courtyard pipe network heating system, comprising:

[0010] A first circulating water pump, whose water outlet is connected to the water inlet of the heat user through a plate heat exchanger, and whose water inlet is connected to the water outlet of the heat user through a filter;

[0011] The second circulating water pump has its water outlet directly connected to the water inlet of the heat user, and its water inlet is connected to the water outlet of the heat user through a filter, so as to increase the circulating flow.

[0012] Optionally, the filter is a low-resistance straight-through filter.

[0013] Optionally, the first circulating water pump and the second circulating water pump are both variable frequency circulating water pumps, including a circulating water pump body and a frequency converter.

[0014] Optionally, the first circulating water pump and the second circulating water pump both adjust the head and flow rate by adjusting the frequency of the frequency converter.

[0015] Optionally, the first circulating water pump and the second circulating water pump are used to adjust the head and flow respectively so that the pressure at the water outlet of the plate heat exchanger is consistent with the pressure at the water outlet of the second variable frequency circulating water pump, and the total circulating flow of the two circulating water pumps is the flow required by the system.

[0016] Optionally, the flow rate required by the system is obtained by performing a hydraulic balance calculation on the courtyard pipe network.

[0017] This application also provides a hydraulic balancing method for a courtyard pipe network heating system, comprising:

[0018] A circulating water pump is added to the heating system, whose outlet is directly connected to the water inlet of the heat user, and whose water inlet is connected to the water outlet of the heat user through a filter to increase the circulation flow.

[0019] Optionally, it also includes:

[0020] Add frequency converters to the original circulating water pump and the newly added circulating water pump to adjust the head and flow of the circulating water pump so that the pressure at the outlet of the plate heat exchanger is consistent with the pressure at the outlet of the newly added circulating water pump, and the total circulating flow of the two circulating water pumps is the flow required by the system.

[0021] Optionally, the filter is a low-resistance straight-through filter.

[0022] Optionally, the flow rate required by the system is obtained by performing a hydraulic balance calculation on the courtyard pipe network.

[0023] The above technical solution of the present application has the following advantages over the prior art:

[0024] The courtyard pipe network heating system described in this application has added a circulating water pump to increase the flow rate. Since the plate heat exchanger has not been modified, in order to reduce the pressure loss of the plate heat exchanger, the pipeline of the newly added circulating water pump is connected after the plate heat exchanger. During operation, the operating parameters of the water pump are adjusted by adjusting the frequency converter of the circulating water pump to increase the flow rate. The original courtyard pipe network return water needs to pass through a Y-type filter to filter out impurities in the water. After the circulation flow rate is increased, the pressure loss of the Y-type filter will increase and it is converted into a low-resistance straight-through filter. This application uses existing equipment to add a circulating water pump, a frequency converter, and a low-resistance straight-through filter, which can significantly increase the circulation flow rate on the original circulation flow rate, effectively alleviate the hydraulic imbalance phenomenon in the courtyard pipe network, and ensure that the indoor temperature of users meets the standard. It solves the hydraulic imbalance phenomenon that often occurs in heating companies and has good social and economic benefits.

[0025] BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the content of this application easier to understand, the following is a further detailed description of this application based on specific embodiments of the application and in conjunction with the accompanying drawings, wherein:

[0027] FIG1 is a schematic structural diagram of a courtyard pipe network heating system provided in this application. DETAILED DESCRIPTION

[0028] The core of this application is to provide a courtyard pipe network heating system and a hydraulic balancing method, which effectively alleviates the hydraulic imbalance phenomenon in the courtyard pipe network.

[0029] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the embodiments described are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present application.

[0030] Please refer to Figure 1, which is a schematic diagram of the structure of a courtyard pipe network heating system provided by this application; the specific structure is as follows:

[0031] A first circulating water pump, whose water outlet is connected to the water inlet of the heat user through a plate heat exchanger, and whose water inlet is connected to the water outlet of the heat user through a filter;

[0032] The second circulating water pump has its water outlet directly connected to the water inlet of the heat user, and its water inlet is connected to the water outlet of the heat user through a filter, so as to increase the circulating flow.

[0033] Based on the above embodiments, since the pressure loss of the existing Y-type filter will increase sharply when the flow rate of the courtyard pipe network increases significantly, in order to reduce the pressure loss and reduce the head and power consumption of the water pump, the filter of this application adopts a low-resistance straight-through filter.

[0034] Based on the above embodiment, the first circulating water pump and the second circulating water pump are both variable frequency circulating water pumps, including a circulating water pump body and a frequency converter; the first circulating water pump and the second circulating water pump both adjust the head and flow by adjusting the frequency of the frequency converter.

[0035] Based on the above embodiments, this application uses a frequency converter to adjust the head and flow of the circulating water pump to match the pressure of the existing circulating water pump after passing through the plate heat exchanger and the total circulating flow required by the courtyard pipe network:

[0036] The first circulating water pump and the second circulating water pump are used to adjust the head and flow respectively so that the pressure at the water outlet of the plate heat exchanger is consistent with the pressure at the water outlet of the second variable frequency circulating water pump, and the total circulating flow of the two circulating water pumps is the flow required by the system.

[0037] Based on the above embodiment, the method for obtaining the flow required by the system includes:

[0038] By performing detailed hydraulic calculations on the existing courtyard pipe network, the required increase in circulation flow can be obtained without modifying the courtyard pipe network;

[0039] After obtaining the required increased circulation flow, the existing heat exchange station equipment is evaluated to determine the equipment parameters to be modified.

[0040] The courtyard pipe network heating system described in this application has added a circulating water pump to increase the flow rate. Since the plate heat exchanger has not been modified, in order to reduce the pressure loss of the plate heat exchanger, the pipeline of the newly added circulating water pump is connected after the plate heat exchanger. During operation, the operating parameters of the water pump are adjusted by adjusting the frequency converter of the circulating water pump to increase the flow rate. The original courtyard pipe network return water needs to pass through a Y-type filter to filter out impurities in the water. After the circulation flow rate is increased, the pressure loss of the Y-type filter will increase and it is converted into a low-resistance straight-through filter. This application uses existing equipment to add a circulating water pump, a frequency converter, and a low-resistance straight-through filter, which can significantly increase the circulation flow rate on the original circulation flow rate, effectively alleviate the hydraulic imbalance phenomenon in the courtyard pipe network, and ensure that the indoor temperature of users meets the standard. It solves the hydraulic imbalance phenomenon that often occurs in heating companies and has good social and economic benefits.

[0041] Based on the above embodiments, the present application also provides a method for hydraulic balancing of a courtyard pipe network heating system, comprising:

[0042] A circulating water pump is added to the heating system, whose outlet is directly connected to the water inlet of the heat user, and whose water inlet is connected to the water outlet of the heat user through a filter to increase the circulation flow.

[0043] Based on the above embodiments, the present application adds a frequency converter to the original circulating water pump and the newly added circulating water pump to adjust the head and flow of the circulating water pump so that the pressure at the outlet of the plate heat exchanger is consistent with the pressure at the outlet of the newly added circulating water pump, and the total circulating flow of the two circulating water pumps is the flow required by the system.

[0044] Based on the above embodiments, since the pressure loss of the existing Y-type filter will increase sharply when the flow rate of the courtyard pipe network increases significantly, in order to reduce the pressure loss and reduce the head and power consumption of the water pump, the filter of this application adopts a low-resistance straight-through filter.

[0045] Based on the above embodiment, the flow rate required by the system is obtained by performing a hydraulic balance calculation on the courtyard pipe network:

[0046] By performing detailed hydraulic calculations on the original courtyard pipe network, the required increase in circulation flow can be obtained without modifying the courtyard pipe network.

[0047] Compared with the courtyard pipe network reconstruction to eliminate hydraulic balance, this application has the following characteristics and innovations:

[0048] (1) The transformation of this application is carried out within the heat exchange station, which is less difficult to construct and has lower costs.

[0049] (2) This application requires adjusting the frequency of the two circulating water pumps to ensure that the pressure and flow rate match.

[0050] (3) This application increases the circulation flow of the courtyard pipe network. Although it increases the power consumption of the heat exchange station, it can effectively solve the hydraulic imbalance problem in the heating system.

[0051] (4) The system applied for is simple and reliable, with low operation and maintenance costs. It solves the problem of high hydraulic imbalance complaint rate in heating enterprises and has good social and economic benefits.

[0052] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. A courtyard pipe network heating system, characterized in that, Comprising: A first circulating water pump, whose water outlet is connected to the water inlet of the heat user through a plate heat exchanger, and whose water inlet is connected to the water outlet of the heat user through a filter; A second circulating water pump, whose water outlet is directly connected to the water inlet of the heat user, and whose water inlet is connected to the water outlet of the heat user through a filter, for increasing the circulating flow rate.

2. The courtyard pipe network heating system according to claim 1, characterized in that, The filter is a low-resistance through-type filter.

3. The courtyard pipe network heating system according to claim 1, characterized in that, Both the first circulating water pump and the second circulating water pump are variable-frequency circulating water pumps, including a circulating water pump body and a frequency converter.

4. The courtyard pipe network heating system according to claim 3, characterized in that, Both the first circulating water pump and the second circulating water pump adjust the head and flow rate by adjusting the frequency of the frequency converter.

5. The courtyard pipe network heating system according to claim 4, wherein The first circulating water pump and the second circulating water pump are used to adjust the head and flow rate respectively, so that the pressure at the water outlet of the plate heat exchanger is the same as the pressure at the water outlet of the second variable-frequency circulating water pump, and the total circulating flow rate superimposed by the two circulating water pumps is the required flow rate of the system.

6. The courtyard pipe network heating system according to claim 1, characterized in that, The required flow rate of the system is obtained by performing a hydraulic balance calculation on the courtyard pipe network.

7. A hydraulic balance method for a courtyard pipe network heating system, characterized in that, Comprising: Adding a circulating water pump in the heating system, whose water outlet is directly connected to the water inlet of the heat user, and whose water inlet is connected to the water outlet of the heat user through a filter, for increasing the circulating flow rate.

8. The hydraulic balance method of the courtyard pipe network heating system according to claim 7, characterized in that Further comprising: Adding a frequency converter to the original circulating water pump and the newly added circulating water pump, for adjusting the head and flow rate of the circulating water pump, so that the pressure at the water outlet of the plate heat exchanger is the same as the pressure at the water outlet of the newly added circulating water pump, and the total circulating flow rate superimposed by the two circulating water pumps is the required flow rate of the system.

9. The hydraulic balance method for the courtyard pipe network heating system according to claim 7, characterized in that The filter is a low-resistance through-type filter.

10. The hydraulic balance method for the courtyard pipe network heating system according to claim 9, characterized in that The required flow rate of the system is obtained by performing a hydraulic balance calculation on the courtyard pipe network.

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