Hot water boiler heat supply system provided with recirculation pipeline
By configuring a hot water boiler heating system with a recirculation pipeline and a DCS control system, the problem of insufficient water supply temperature under extremely low temperatures is solved, and safe boiler operation and stable heating effects are achieved.
Patent Information
- Application Number
- CN202422643392.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Under extremely low temperature conditions, the water supply temperature of the cogeneration unit is difficult to meet the requirements of the heating network. When the natural gas boiler is providing heating, there are problems such as insufficient water replenishment in the boiler pipeline, excessive temperature leading to gasification and low-temperature corrosion, and one-time heat exchange cannot meet the heating needs.
The hot water boiler heating system with recirculation pipes is equipped with recirculation pipes between the boiler and the heating network, equipped with temperature sensors and thermostatic valves, and using the DCS control system to achieve temperature regulation of the boiler and heating network water circulation, ensuring safe operation of the boiler and stable water supply temperature.
Effectively increase the water supply temperature of the heating network, avoid low-temperature corrosion of the boiler, ensure the smooth operation of the boiler equipment, and meet the heating needs of heat users.
Smart Images
Figure CN223306994U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of heating equipment, in particular to a hot water boiler heating system equipped with a recirculation pipeline. Background Art
[0002] Currently, large-scale cogeneration units are the primary heat source for urban heating, carrying the primary heat load. With the rapid development of cities, the expansion of town size and population, the heating network often struggles to meet required hot water temperatures during the heating season, especially during the coldest months. The supply water temperature of cogeneration units is limited by extraction steam parameters, often reaching a maximum of 130°C or less. This makes it impossible to further increase the supply water temperature to meet the requirements of heat users when the return water temperature drops.
[0003] In this situation, using natural gas hot water boilers to supplement the heating network and meet peak heat load demands is a good option. This can further increase the supply water temperature to meet the medium temperature requirements of secondary stations or heat users. However, using natural gas boilers to supplement the heating network can lead to problems such as insufficient water in the boiler pipes, vaporization of hot water due to excessively high temperatures, low boiler inlet water temperatures, and low-temperature corrosion of the boiler flue. Furthermore, in extremely low temperatures, if the return water temperature of the heating network drops too low, even with certain heat exchanger conditions, relying solely on primary heat exchange from the boiler may still not meet the supply water temperature, thus failing to achieve the desired heating effect. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a hot water boiler heating system equipped with a recirculation pipe, which can effectively increase the water supply temperature of the heating network and ensure the stable operation of the boiler equipment.
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a hot water boiler heating system equipped with a recirculation pipe, comprising a natural gas boiler, the water inlet pipe and the water outlet pipe of the natural gas boiler are connected to each other to form a boiler circulating hot water pipe, a boiler temperature sensor is provided on the water inlet pipe, a heat exchanger is provided on the boiler circulating hot water pipe, a hot network circulating hot water pipe is connected between the hot network return water inlet and the hot network water supply inlet, a hot network temperature sensor is provided on the hot network water supply inlet pipe, the hot network circulating hot water pipe is connected to the heat exchanger, and is used to exchange heat between the water in the hot network circulating hot water pipe and the water in the boiler circulating hot water pipe; a boiler recirculation pipe is connected in parallel between the water inlet pipe and the water outlet pipe of the natural gas boiler, and a boiler temperature regulating valve whose opening is adjusted by the boiler temperature sensor data is provided on the boiler recirculation pipe; a hot network recirculation pipe is connected in parallel between the hot network water supply inlet pipe and the hot network return water inlet pipe, and a hot network temperature regulating valve whose opening is adjusted by the heating network temperature sensor data is provided on the hot network recirculation pipe.
[0006] A further improvement of the technical solution of the present utility model is that a boiler circulating water pump is provided on the boiler circulating hot water pipeline, and a heating network circulating water pump is provided on the heating network circulating hot water pipeline.
[0007] A further improvement of the technical solution of the present utility model is that a heat network recirculation water pump is provided on the heat network recirculation pipeline.
[0008] A further improvement of the technical solution of the present utility model is that a water supply constant pressure pipe is connected to the boiler circulating hot water pipe.
[0009] The further improvement of the technical solution of the present utility model is that: the boiler temperature sensor and the boiler thermostatic valve are interlocked and controlled in the DCS; the heating network temperature sensor and the heating network thermostatic valve are interlocked and controlled in the DCS.
[0010] Due to the adoption of the above-mentioned technical solution, the technical progress achieved by the present invention is as follows: by setting up a boiler recirculation pipeline and equipping a boiler thermostatic valve whose opening is adjusted by the data of the boiler water inlet temperature sensor, the temperature of the boiler inlet water can be guaranteed not to be lower than the set value. Under the condition where the return water temperature of the extremely low-temperature heating network is too low, low-temperature corrosion of the boiler flue is avoided, thereby ensuring the safe operation of the natural gas boiler. By setting up a heating network recirculation pipeline and equipping a heating network thermostatic valve whose opening is adjusted by the data of the heating network water supply port temperature sensor, when the heating temperature at the extremely low-temperature water supply port does not meet the conditions, a portion of the heating network supply water can be mixed with the heating network return water through the recirculation pipeline and enter the heat exchanger, thereby increasing the water supply temperature to meet the needs of heat users. By setting up a water supply constant pressure pipe, it can be ensured that the high-temperature hot water in the pipeline does not vaporize, and the boiler can operate smoothly for a long time. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can derive other drawings based on these drawings without inventive effort.
[0012] Figure 1 This is a principle block diagram of the utility model;
[0013] Among them, 1. Boiler circulating water pump, 2. Heating network circulating water pump, 3. Heating network recirculating water pump, 4. Boiler temperature control valve, 5. Heating network temperature control valve, 6. Heat exchanger, 7. Natural gas boiler, 8. Heating network water supply port, 9. Heating network return port. DETAILED DESCRIPTION
[0014] The present invention is further described in detail below with reference to the embodiments:
[0015] like Figure 1 Figure 1 shows a schematic diagram of a hot water boiler heating system with a recirculation pipeline. The system consists of an internal heat supply system and an external heat supply system. The internal heat supply system includes a natural gas boiler 7, a heat exchanger 6, and a boiler circulating water pump 1. The natural gas boiler 7 is equipped with a water inlet and a water outlet. Natural gas combustion in the boiler heats the internal circulating water, producing high-temperature hot water. The boiler's water inlet is connected to an inlet pipe, and the water outlet is connected to an outlet pipe. The outlet and inlet pipes are interconnected to form a continuous boiler circulating hot water pipeline. A boiler temperature sensor is installed on the boiler's water inlet pipe to monitor the temperature of the circulating water entering the boiler for heating. The boiler circulating hot water pipeline is equipped with a boiler circulating water pump 1 for pressurization and improved circulation. The boiler circulating hot water pipeline is equipped with a heat exchanger 6, which connects to the secondary external heat supply system via the heat exchanger 6. This pipeline is used to supply heat from the boiler-heated circulating water to the water supply network, providing better heating for users. The external heating system includes a heating network for heating residents. A circulating hot water pipe is connected between the network's return water inlet 9 and the network's water supply inlet 8. A temperature sensor is installed on the water supply inlet 8 to monitor the temperature of the hot water supplied by the network to users and determine the heating quality. A circulating water pump 2 is installed on the circulating hot water pipe to increase pressure for better circulation. The circulating hot water pipe is connected to a heat exchanger 6. Heat exchange between the water within the circulating hot water pipe and the water within the boiler's circulating hot water pipe—that is, heat generated by natural gas combustion in the internal circulation heating system—is transferred to the external heating system through the heat exchanger, providing heat supplementation for the external heating system.
[0016] A boiler recirculation pipe is connected in parallel between the water inlet and outlet pipes of the natural gas boiler 7. This recirculation pipe is equipped with a boiler thermostatic valve 4, whose opening is adjusted by data from the boiler temperature sensor. Specifically, the boiler temperature sensor and boiler thermostatic valve 4 are interlocked and controlled by the DCS. The boiler temperature sensor constantly monitors the water temperature at the boiler inlet, and a temperature threshold can be set as needed. During extreme cold weather, when the water temperature in the heating network is too low, the internal recirculation heating system, after supplying heat to the heating network, drops too low. When the temperature of the circulating return water entering the natural gas boiler 7 water inlet pipe is too low, and falls below the set detection threshold, the boiler thermostatic valve 4 is controlled to open. A portion of the water heated by the natural gas boiler 7 flows directly through the boiler recirculation pipe to the boiler water inlet, where it mixes with the incoming water to raise the inlet water temperature. This prevents low-temperature corrosion of the boiler flue under low temperature conditions and ensures safe boiler operation. When the boiler temperature sensor detects that the temperature at the boiler inlet meets the required level, the boiler thermostatic valve 4 is controlled to close.
[0017] A recirculation pipeline is connected in parallel between the heating network water supply inlet 8 and the return water inlet 9. This recirculation pipeline is equipped with a thermostatic valve 5, whose opening is adjusted based on data from the heating network temperature sensor. Specifically, the temperature sensor and thermostatic valve 5 are interlocked and controlled within the DCS. A recirculation pump 3 is installed on the recirculation pipeline to pressurize the water in the recirculation pipeline to ensure circulation. The temperature sensor constantly monitors the temperature at the heating network water supply inlet 8. The water supply monitoring temperature threshold can be customized to ensure that the heating water provided to users is at a normal temperature and does not drop too low to affect heating. During extremely low temperatures, if the temperature at the heating network water supply port 8 is detected to be low and below the set monitoring threshold, the heating network thermostatic valve 5 is controlled to open. A portion of the high-temperature heating network water, which has been heated by the heat exchanger 6, flows through the heating network recirculation pipe to the heating network return water port 9, where it mixes with the originally low-temperature water in the heating network return water port 9 and is heated. This raises the temperature of the water in the heating network return water port 9, which is waiting to flow into the heat exchanger 6 for heating, ensuring that the temperature of the water flowing out of the heating network water supply port 8 after heat exchange meets the heating requirements and maintains the stability of the heating network water supply temperature. When the heating network temperature sensor detects that the water temperature at the heating network water supply port 8 meets the heating requirements, the heating network thermostatic valve 5 is controlled to close.
[0018] The embodiments described above are merely descriptions of preferred implementation methods of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.
Claims
1. A hot water boiler heating system with a recirculation pipe, comprising a natural gas boiler (7), wherein a water inlet pipe and a water outlet pipe of the natural gas boiler (7) are connected to form a boiler circulating hot water pipe, a boiler temperature sensor is provided on the water inlet pipe, a heat exchanger (6) is provided on the boiler circulating hot water pipe, a heating network circulating hot water pipe is connected between a heating network return port (9) and a heating network water supply port (8), a heating network temperature sensor is provided on the heating network water supply port (8), and the heating network circulating hot water pipe is connected to the heat exchanger (6) for exchanging heat between water in the heating network circulating hot water pipe and water in the boiler circulating hot water pipe. The system is characterized in that: A boiler recirculation pipe is connected in parallel between a water inlet pipe and a water outlet pipe of a natural gas boiler (7), and a boiler thermostatic valve (4) whose opening is adjusted by data from a boiler temperature sensor is provided on the boiler recirculation pipe; a heating network recirculation pipe is connected in parallel between a heating network water supply port (8) pipe and a heating network return port (9) pipe, and a heating network thermostatic valve (5) whose opening is adjusted by data from a heating network temperature sensor is provided on the heating network recirculation pipe.
2. A hot water boiler heating system with a recirculation pipe according to claim 1, characterized in that: A boiler circulating water pump (1) is provided on the boiler circulating hot water pipeline, and a heating network circulating water pump (2) is provided on the heating network circulating hot water pipeline.
3. The hot water boiler heating system with a recirculation pipe according to claim 1, characterized in that: A heat network recirculation water pump (3) is provided on the heat network recirculation pipeline.
4. The hot water boiler heating system with a recirculation pipe according to claim 1, characterized in that: A water supply constant pressure pipe (10) is connected to the boiler circulating hot water pipe.
5. The hot water boiler heating system with a recirculation pipe according to claim 1, characterized in that: The boiler temperature sensor and the boiler thermostatic valve (4) are interlocked and controlled in the DCS; the heating network temperature sensor and the heating network thermostatic valve (5) are interlocked and controlled in the DCS.