Heat pump driving steam source cooling optimization system

Abstract

The invention discloses a heat pump driving steam source cooling optimization system, and relates to the technical field of heat pump driving, the heat pump driving steam source cooling optimization system comprises a steam cooler connected with a heat pump system, a cooling adjusting unit arranged on the water side of the steam cooler, and a hydrophobic treatment unit and a backflow pipeline arranged on the steam side of the steam cooler; through a steam cooler and a cooling adjusting unit, heat supply network circulating water is used for indirectly cooling driving steam, and the cooling water amount is automatically adjusted according to the temperature of a steam main pipe, so that the temperature of the driving steam is stabilized within the optimal range of 120-150 DEG C and is not influenced by load fluctuation of a thermal power plant, and efficient operation of a heat pump is ensured; steam cooler steam side drain water is discharged in time, steam is prevented from carrying water, heat pump driving steam temperature and flow are balanced, drain pipeline vibration is eliminated, and heat pump system stability is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of heat pump drive technology, and in particular to a heat pump-driven steam source cooling optimization system. Background Technology

[0002] With the continuous improvement of energy efficiency, heat pump technology is being used more and more widely in thermal power plants. Heat pump systems can effectively utilize the latent heat of vaporization in exhaust steam to heat the circulating water of the heating network, thereby improving heating capacity and economy.

[0003] Currently, the driving steam for heat pumps in thermal power plants is typically drawn from the five-extraction heating system or auxiliary headers, with temperatures exceeding 250°C. Absorption heat pumps, however, require driving steam temperatures controlled at around 120-150°C. Existing systems often employ water spray desuperheating devices for cooling, but these methods present several problems: the power plant load fluctuates significantly with the output of new energy sources, leading to frequent changes in driving steam volume and making precise control of the desuperheating water flow difficult. During load adjustments, untimely or improper operation by personnel can result in poor atomization of the desuperheating device nozzles, causing large fluctuations in driving steam temperature and making it difficult to stabilize at the optimal operating temperature. Furthermore, when multiple heat pumps are arranged in parallel, the different paths and number of bends in the driving steam pipes further exacerbate temperature inhomogeneity. Some heat pump driving steam pipes are prone to water accumulation due to numerous bends, leading to higher temperatures in some heat pumps. Additionally, the driving steam drains of several heat pumps are connected to the same pipeline; uneven temperature and flow often cause pipeline vibration, affecting the safe and stable operation of the system. In addition, existing desuperheating devices waste energy during operation. The injected desuperheating water is not fully utilized, and some heat is directly discharged with the condensate, reducing the system's thermal efficiency and increasing the plant's electricity consumption.

[0004] Based on the above problems, we propose an optimized system for cooling a heat pump-driven steam source. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is: how to overcome the defects in the prior art, such as the difficulty in accurately controlling the temperature of heat pump driven steam, the uneven temperature and flow rate leading to pipe vibration when multiple heat pumps are arranged in parallel, and the energy waste of the de-cooling device, so as to achieve stable and efficient operation of the heat pump system.

[0006] The above-mentioned technical problems are solved by the following technical solution: a steam cooler connected to a heat pump system, a condensate treatment unit located on the steam side of the steam cooler, a cooling regulating unit located on the water side of the steam cooler, and a return pipe connected to the steam cooler; the condensate treatment unit discharges the condensate generated on the steam side of the steam cooler, the cooling regulating unit cools the driving steam through the heat network circulating water, the return pipe cools the driving steam of the cooling regulating unit, and the heated circulating water is returned to the heat pump outlet circulating water header.

[0007] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: the condensate treatment unit includes a first pipe connecting the steam cooler and the condensate tank.

[0008] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: the outer wall of the first pipe is provided with a pre-drainage gate and a post-drainage gate.

[0009] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: a condensate regulating valve is provided between the condensate front gate and the condensate rear gate.

[0010] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: the outer wall of the first pipe is provided with a first branch pipe, and the outer wall of the first branch pipe is provided with a drain bypass valve.

[0011] In a preferred embodiment of the heat pump-driven steam source cooling optimization system of the present invention: the cooling adjustment unit includes a second pipe connected between the steam cooler and the outlet header of the heating network circulating water pump.

[0012] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: the outer wall of the second pipe is provided with a water inlet pre-gate and a water inlet post-gate.

[0013] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: a water inlet regulating valve is provided between the water inlet front gate and the water inlet rear gate.

[0014] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: the outer wall of the second pipe is provided with a second branch pipe, and the outer wall of the second branch pipe is provided with a water inlet bypass valve.

[0015] In a preferred embodiment of the heat pump driven steam source cooling optimization system of the present invention: the return pipe is connected between the steam cooler and the heat pump outlet circulating water header.

[0016] The beneficial effects of this invention are as follows: By using a steam cooler and a cooling regulation unit, the driving steam is indirectly cooled by the circulating water of the heating network. The cooling water volume is automatically adjusted according to the temperature of the steam header, so that the driving steam temperature is stabilized in the optimal range of 120-150°C, unaffected by the load fluctuations of the thermal power plant, ensuring the efficient operation of the heat pump. In addition, the condensate treatment unit promptly discharges the steam-side condensate from the steam cooler to prevent water carryover in the steam, balances the driving steam temperature and flow rate of each heat pump, eliminates vibration of the condensate pipe, and ensures the stability of the heat pump system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0018] Figure 1 A diagram of a heat pump-driven steam source cooling optimization system is shown. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0021] Reference Figure 1 This embodiment provides a heat pump driven steam source cooling optimization system, including a steam cooler 1 connected to a heat pump system, a condensate treatment unit 2 located on the steam side of the steam cooler 1, a cooling regulation unit 3 located on the water side of the steam cooler 1, and a return pipe 4 connected to the steam cooler 1; the water side of the steam cooler 1 is connected to the heat pump inlet heat network circulating water, and the steam side is connected to the drive steam header. The heat network circulating water absorbs heat from the drive steam in the steam cooler 1, thereby reducing the temperature of the drive steam and ensuring that the temperature of the drive steam is stable within the optimal operating range of 120-150°C.

[0022] The condensate treatment unit 2 discharges the condensate generated on the steam side of the steam cooler 1. The cooling regulating unit 3 cools the driving steam through the heat network circulating water. The condensate treatment unit 2 is located on the steam side of the steam cooler 1 and is mainly responsible for discharging the condensate generated by the steam cooler 1 during the cooling process, preventing water carryover in the steam, and avoiding pipe vibration and equipment damage caused by condensate accumulation. The cooling regulating unit 3 is located on the water side of the steam cooler 1 and regulates the temperature of the driving steam by controlling the flow rate of the heat network circulating water entering the steam cooler 1. The return pipe 4 returns the circulating water cooled by the cooling regulating unit 3 to the heat pump outlet circulating water header, realizing the recycling of water resources and improving the thermal efficiency of the system.

[0023] As an optional embodiment, the hydrophobic treatment unit 2 includes a first pipe 21 connected between the steam cooler 1 and the hydrophobic tank. In the steam cooler 1, the driving steam will condense into hydrophobic water during the cooling process. This hydrophobic water needs to be discharged in time to prevent the steam from carrying water and affecting the stable operation of the heat pump system. The first pipe 21 provides a stable transmission path for the hydrophobic water, ensuring that the hydrophobic water can flow smoothly from the steam cooler 1 to the hydrophobic tank.

[0024] As an optional embodiment, the outer wall of the first pipe 21 is provided with a pre-drainage shut-off valve 211 and a post-drainage shut-off valve 212, which can flexibly control the flow of condensate in the first pipe 1, facilitating system maintenance and adjustment. The pre-drainage shut-off valve 211 is located at the front end of the first pipe 21, i.e., near the steam cooler 1, and is used to open or close the pipe so as to stop or resume the flow of condensate when needed. During normal system operation, the pre-drainage shut-off valve 211 is in the open state, allowing condensate to flow from the steam cooler 1 to the condensate tank. When it is necessary to inspect the steam cooler 1 or the first pipe 21, or when it is necessary to cut off the condensate discharge, closing the pre-drainage shut-off valve can isolate the connection between the steam cooler 1 and the condensate tank.

[0025] The drain shut-off valve 212 is located at the rear end of the first pipe 21, that is, near the drain tank. It is also used to control the opening and closing of the first pipe 1. During system operation, the drain shut-off valve 212 is usually kept open to ensure that the drain can return to the drain tank smoothly. When maintenance is required on the end of the first pipe 1 near the drain tank, or in an emergency it is necessary to prevent the drain from flowing back to the drain tank, closing the drain shut-off valve 212 can quickly isolate the first pipe 1.

[0026] As an optional embodiment, a condensate regulating valve 213 is provided between the condensate pre-stop valve 211 and the condensate post-stop valve 212 to ensure that condensate can be discharged in a timely manner and to avoid water accumulation in the steam cooler 1; and to ensure that the condensate flow rate entering the inlet header of the heat network heater is moderate so as to maximize heat recovery (it should be noted that after the driving steam is cooled by the circulating water, since it is surface heat exchange, very little condensate is generated from the driving steam. When there is no condensate, the condensate regulating valve is closed to prevent steam from flowing to the condensate tank and causing waste of working fluid. The regulating valve is only opened when the steam cooler generates condensate to drain the condensate clean).

[0027] As an optional embodiment, the outer wall of the first pipe 21 is provided with a first branch pipe 22, and the outer wall of the first branch pipe 22 is provided with a drainage bypass valve 221; the first branch pipe 22 is led out from the first pipe 21 to form a bypass, and the drainage front stop valve 211, the drainage rear stop valve 212 and the drainage regulating valve 213 are all located on the outer wall of the first pipe 21 between the inlet and outlet of the first branch pipe 22.

[0028] As an optional embodiment, the cooling regulating unit 3 includes a second pipe 31 connected between the steam cooler 1 and the heat pump inlet circulating water header. The second pipe 31 allows a portion of the heating network circulating water to circulate between the steam cooler 1 and the heat pump outlet header. A portion of the heating network circulating water is transported from the heat pump inlet header to the steam cooler 1, where it absorbs heat from the driving steam and its temperature rises. Subsequently, the circulating water carrying heat returns to the heat pump outlet header through the return pipe 4 and participates in the heating process of the heating network, thereby achieving effective utilization of heat.

[0029] As an optional embodiment, the outer wall of the second pipe 31 is provided with a pre-inlet shut-off valve 311 and a post-inlet shut-off valve 312, which can flexibly control the flow of circulating water in the second pipe 31 and facilitate system maintenance and adjustment. The pre-inlet shut-off valve 311 is located at the front end of the second pipe 31, that is, near the steam cooler 1, and is used to control the opening and closing of the second pipe 31. When the system is running normally, the pre-inlet shut-off valve 311 is in the open state, allowing the circulating water of the heating network to flow from the steam cooler 1 to the heat pump outlet header. When it is necessary to maintain the steam cooler 1 or the second pipe 21 or to cut off the circulating water supply, closing the pre-inlet shut-off valve 311 can effectively isolate the connection between the steam cooler 1 and the heat pump inlet header.

[0030] The inlet shut-off valve 312 is located at the rear end of the second pipe 31, near the outlet header of the heat network heater, and is also used to control the opening and closing of the second pipe 31. During system operation, the inlet shut-off valve 312 is usually kept open to ensure that circulating water can smoothly enter the heat pump outlet header. When maintenance is required on the end of the second pipe 31 near the heat pump inlet circulating water header, or when it is necessary to prevent circulation into the evaporator, closing the inlet shut-off valve 312 can achieve rapid isolation of the pipe.

[0031] As an optional embodiment, an inlet regulating valve 313 is provided between the inlet pre-inlet gate 311 and the inlet post-inlet gate 312 to precisely control the flow rate of the hot network circulating water entering the steam cooler 1. When the driving steam temperature rises, the inlet regulating valve 313 automatically opens wider to increase the circulating water flow rate, thereby enhancing the cooling effect and reducing the steam temperature. When the driving steam temperature decreases, the inlet regulating valve 313 automatically closes narrower to reduce the circulating water flow rate, avoid over-cooling, and ensure that the driving steam temperature remains stable within the optimal operating range of 120-150℃.

[0032] As an optional embodiment, the outer wall of the second pipe 31 is provided with a second branch pipe 32, and the outer wall of the second branch pipe 32 is provided with an inlet bypass valve 321. The second branch pipe 32 is led out from the second pipe 31 to form a bypass. The inlet pre-inlet valve 311, the inlet post-inlet valve 312 and the inlet regulating valve 313 are all provided on the outer wall of the second pipe 31 between the inlet and outlet of the second branch pipe 32.

[0033] As an optional embodiment, the return pipe 4 is connected between the steam cooler 1 and the heat pump outlet header of the heating network. Through the return pipe 4, the circulating water after cooling the driving steam flows back to the heat pump circulating water outlet header, thereby reducing energy waste and lowering plant power consumption.

[0034] In operation, the heat pump drive steam is first indirectly cooled by a steam cooler. The condensate generated during the cooling process is transported through the first pipe. The flow of condensate is controlled and the flow rate is finely adjusted by using a pre-condensate shut-off valve, a post-condensate shut-off valve, and a condensate regulating valve. At the same time, the heat network circulating water effectively transfers the heat from the drive steam source to the heat network circulating water through the steam cooler, achieving heat energy recovery. The circulating water after cooling the drive steam flows back to the heat pump outlet circulating water header through a return pipe, completing the entire heat exchange and recovery process. This ensures that the heat pump system operates efficiently within a stable temperature range, while improving energy utilization efficiency and reducing operating costs.

[0035] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A heat pump-driven steam source cooling optimization system, characterized in that: include, A steam cooler (1) connected to a heat pump system, a condensate treatment unit (2) located on the steam side of the steam cooler (1), a cooling regulating unit (3) located on the water side of the steam cooler (1), and a return pipe (4) connected to the steam cooler (1); The condensate treatment unit (2) discharges the condensate generated on the steam side of the steam cooler (1), the cooling regulation unit (3) cools the driving steam through the heat network circulating water, and the return pipe (4) returns the circulating water heated by the cooling regulation unit (3) after cooling the driving steam to the heat pump outlet circulating water header.

2. The heat pump-driven steam source cooling optimization system according to claim 1, characterized in that: The hydrophobic treatment unit (2) includes a first pipe (21) connecting the steam cooler (1) and the hydrophobic tank.

3. The heat pump-driven steam source cooling optimization system according to claim 2, characterized in that: The outer wall of the first pipe (21) is provided with a front drain valve (211) and a rear drain valve (212).

4. The heat pump-driven steam source cooling optimization system according to claim 3, characterized in that: A drainage regulating valve (213) is provided between the drainage front gate (211) and the drainage rear gate (212).

5. The heat pump-driven steam source cooling optimization system according to claim 2 or 3, characterized in that: The outer wall of the first pipe (21) is provided with a first branch pipe (22), and the outer wall of the first branch pipe (22) is provided with a drainage bypass valve (221).

6. The heat pump-driven steam source cooling optimization system according to claim 1, characterized in that: The cooling regulating unit (3) includes a second pipe (31) connected between the steam cooler (1) and the outlet header of the heating network circulating water pump.

7. The heat pump-driven steam source cooling optimization system according to claim 6, characterized in that: The second pipe (31) has a water inlet gate (311) and a water inlet gate (312) on its outer wall.

8. The heat pump-driven steam source cooling optimization system according to claim 7, characterized in that: An inlet regulating valve (313) is provided between the inlet front gate (311) and the inlet rear gate (312).

9. The heat pump-driven steam source cooling optimization system according to claim 6 or 7, characterized in that: The second pipe (31) has a second branch pipe (32) on its outer wall, and the second branch pipe (32) has an inlet bypass valve (321) on its outer wall.

10. The heat pump-driven steam source cooling optimization system according to claim 1, characterized in that: The return pipe (4) is connected between the steam cooler (1) and the heat pump outlet circulating water header.

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