A system for recovering steam from the top of a cooling tower of a waste heat power plant using a ground source heat pump

Abstract

The utility model provides a system of waste heat power plant cooling tower top steam water recovery is carried out with the application of ground source heat pump, the system includes shallow ground heat energy heat extraction system, ground source heat pump system and cooling tower top steam water recovery system, shallow ground heat energy heat extraction system's output end is connected ground source heat pump system, and the output end of ground source heat pump system is connected cooling tower top steam water recovery system, the utility model will ground heat energy into cold energy, carries out condensation to the steam of cooling tower dissipation, can recover water resources.

Description

Technical Field

[0001] This utility model relates to the field of ground source heat pump and water-saving technology, and more specifically, to a system for recovering steam and water from the top of a waste heat power plant cooling tower using a ground source heat pump. Background Technology

[0002] Waste heat power plants currently offer numerous advantages, such as generating electricity using waste heat without the need for fuel, resulting in lower power generation costs, reduced greenhouse gas emissions and air pollution, and lower investment with a shorter payback period. However, water-cooled waste heat power generation units suffer from significant water consumption, especially in the circulating cooling towers. The cooling principle and equipment characteristics of these towers dictate that a large amount of water is discharged into the atmosphere from the top. Therefore, reducing the water consumption of circulating cooling towers in water-cooled waste heat power generation units remains a common challenge in the industry, and a satisfactory solution has yet to be found.

[0003] By utilizing shallow geothermal energy and adding a ground source heat pump unit, and taking advantage of the cooling function of the ground source heat pump, the water and water vapor lost from the top of the cooling tower can be cooled, thus achieving steam and water recovery and significantly reducing steam and water loss. This is a better approach. Utility Model Content

[0004] In response to the above situation, this utility model provides a system for recovering steam and water from the top of a cooling tower in a waste heat power plant using a ground source heat pump. This system, by setting up a shallow geothermal energy extraction system, a ground source heat pump system, and a steam and water recovery device at the top of the cooling tower, converts geothermal energy into cold energy, condenses the steam and water lost from the cooling tower, thereby recovering water resources and improving the overall image of the factory.

[0005] Specifically, this utility model is achieved through the following technical solution:

[0006] A system for recovering steam and water from the top of a cooling tower in a waste heat power plant using a ground source heat pump, characterized in that: the system includes a shallow geothermal energy extraction system, a ground source heat pump system, and a cooling tower top steam and water recovery system; the output end of the shallow geothermal energy extraction system is connected to the ground source heat pump system, and the output end of the ground source heat pump system is connected to the cooling tower top steam and water recovery system, wherein:

[0007] The shallow geothermal energy extraction system includes a geothermal well, a buried pipe installed in the geothermal well, a buried pipe manifold connected to the input end of the buried pipe, a geothermal water return pipe connected to the buried pipe manifold, a buried pipe collector connected to the output end of the buried pipe, a geothermal water supply pipe connected to the buried pipe collector, and a geothermal water circulation pump connected to the geothermal water supply pipe.

[0008] The ground source heat pump includes a heat pump unit, which includes an evaporator, a condenser, and a PLC controller. The evaporator, condenser, and PLC controller are located inside the heat pump unit. The input end of the evaporator is connected to an evaporator inlet pipe, and the output end of the evaporator is connected to an evaporator outlet pipe. The input end of the condenser is connected to a condenser inlet pipe, and the output end of the condenser is connected to a condenser outlet pipe.

[0009] The cooling tower top vapor-water recovery system includes a cooling tower top vapor-water recovery device, a chilled water inlet pipe, a chilled water outlet pipe, a cooling tower, and a water tank; the cooling tower top vapor-water recovery device includes a cooling tower top vapor-water recovery device heat exchange tube bundle, a cooling tower top vapor-water recovery device water collection network, a water collection trough, and a water inlet pipe; wherein:

[0010] The input end of the cooling tower top vapor-water recovery device is connected to the chilled water inlet pipe, and the output end of the cooling tower top vapor-water recovery device is connected to the chilled water outlet pipe. A chilled water circulating pump is connected to the chilled water inlet pipe, and the chilled water circulating pump is connected to the evaporator outlet pipe. The water collection network of the cooling tower top vapor-water recovery device is arranged on the heat exchange tube bundle of the cooling tower top vapor-water recovery device. The water collection tank is arranged at a lower position on both sides of the heat exchange tube bundle of the cooling tower top vapor-water recovery device to collect condensate. The water inlet pipe is connected to one end of the water collection tank, and the other end is led to the water pool.

[0011] Furthermore, the heat exchange tube bundle of the cooling tower top steam-water recovery device is an "M" type tube bundle with a tube diameter of DN20~DN50 and a tube center spacing of 50~150mm.

[0012] Furthermore, the water collection net of the cooling tower top steam-water recovery device is made of 4mm~10mm stainless steel mesh, the water collection trough is made of stainless steel with a width of 700mm~900mm, and the water inlet pipe has a diameter of 100mm~150mm.

[0013] Beneficial effects

[0014] This invention provides a system for recovering steam and water from the top of a cooling tower in a waste heat power plant using a ground source heat pump, solving the problem of steam and water loss in existing waste heat power plant cooling towers. This invention has the following advantages:

[0015] 1. Since the current cooling tower steam and water losses are not effectively recovered, this invention solves the problem of cooling tower steam and water recovery.

[0016] 2. This invention uses geothermal energy and a small amount of electricity as energy input. Geothermal energy has low operating costs, which can reduce the overall operating costs of the system.

[0017] 3. This invention utilizes ground source heat pump technology to effectively utilize low-grade geothermal energy and reduce fossil fuel consumption. Attached Figure Description

[0018] Figure 1 This is a system diagram of a waste heat power plant cooling tower top steam and water recovery system using a ground source heat pump, as described in this invention.

[0019] Figure 2 This is a schematic diagram of a steam-water recovery device at the top of a cooling tower.

[0020] Figure 3 Schematic diagram of the heat exchange tube bundle of the steam-water recovery device at the top of the cooling tower;

[0021] Figure 4 Schematic diagram of the water collection network for the steam-water recovery device at the top of the cooling tower;

[0022] Figure 5 This is a schematic diagram of the water collection tank and water inlet pipe of the steam-water recovery device at the top of the cooling tower.

[0023] In the diagram: 100 - Shallow geothermal energy extraction system; 101 - Buried pipe manifold; 102 - Geothermal well; 103 - Buried pipe; 104 - Buried pipe collector; 105 - Geothermal water supply pipeline; 105a - Geothermal water circulation pump; 106 - Geothermal water return pipeline.

[0024] 200 - Ground source heat pump system; 201 - Heat pump unit; 201a - Evaporator; 201b - Condenser; 201c - PLC controller; 202 - Evaporator inlet pipe; 203 - Evaporator outlet pipe; 204 - Condenser inlet pipe; 205 - Condenser outlet pipe;

[0025] 300 - Cooling tower top steam and water recovery system; 301 - Cooling tower top steam and water recovery device; 301a - Cooling tower top steam and water recovery device heat exchange tube bundle; 301b - Cooling tower top steam and water recovery device water collection network; 301c - Water collection tank; 301d - Water inlet pipe; 302 - Chilled water inlet pipe; 302a - Chilled water circulating pump; 303 - Chilled water outlet pipe; 304 - Cooling tower; 305 - Water tank Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] See Figure 1The present invention provides a technical solution: a system for recovering steam and water from the top of a cooling tower in a waste heat power plant using a ground source heat pump, comprising a shallow geothermal energy extraction system 100, a ground source heat pump system 200, and a cooling tower top steam and water recovery system 300. The output end of the shallow geothermal energy extraction system 100 is connected to the ground source heat pump system 200, and the output end of the ground source heat pump system 200 is connected to the cooling tower top steam and water recovery system 300.

[0028] In this embodiment, the shallow geothermal energy extraction system 100 includes a geothermal well 102, and a buried pipe 103 is installed inside the geothermal well 102. The geothermal well, i.e., the buried pipe, can be multiple depending on the load calculation. A buried pipe manifold is connected to the input end of the buried pipe 103, supplying water to multiple buried pipes. The buried pipe manifold is connected to a geothermal water return pipe 106, which is connected to the condenser outlet pipe 205. A buried pipe collector 104 is connected to the output end of the buried pipe 103. A geothermal water supply pipe 105 is connected to one side of the buried pipe collector 104, and a geothermal water circulation pump 105a is connected to one side of the geothermal water supply pipe 105. The geothermal water circulation pump 105a is connected to the condenser inlet pipe 204.

[0029] In this embodiment, the ground source heat pump system 200 includes a heat pump unit 201, which includes an evaporator 201a, a condenser 201b, and a PLC controller 201c. The evaporator 201a is located on one side of the condenser 201b, and the PLC controller 201c is located on the other side of the evaporator 201a. The input end of the evaporator 201a is connected to an evaporator inlet pipe 202, which is connected to a chilled water outlet pipe 303. The output end of the evaporator 201a is connected to an evaporator outlet pipe 203, which is connected to a chilled water circulating pump 302a. The other end of the chilled water circulating pump is connected to the chilled water inlet pipe 302. The input end of the condenser 201b is connected to the condenser inlet pipe 204, which is connected to the geothermal circulating water pump 105a. The output end of the condenser 201b is connected to the condenser outlet pipe 205, which is connected to the geothermal return water pipe 106.

[0030] In this embodiment, the cooling tower top vapor-water recovery system 300 includes a cooling tower top vapor-water recovery device 301, a chilled water inlet pipe 302, a chilled water outlet pipe 303, a cooling tower 304, and a water tank 305. The input end of the cooling tower top vapor-water recovery device 301 is connected to the chilled water inlet pipe 302, and the output end of the cooling tower top vapor-water recovery device 301 is connected to the chilled water outlet pipe 303. A chilled water circulating pump 302a is connected to the chilled water inlet pipe 302, and the chilled water circulating pump 302a is connected to the evaporator outlet pipe 203.

[0031] In this embodiment, the cooling tower top steam and water recovery device 301 is further configured to include a cooling tower top steam and water recovery device heat exchange tube bundle 301a, a cooling tower top steam and water recovery device water collection network 301b, a water collection tank 301c, and a water inlet pipe 301d.

[0032] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0033] Example: As shown in the accompanying drawings, a system for recovering steam and water from the top of a cooling tower in a waste heat power plant using a ground source heat pump is provided. The system consists of a shallow geothermal energy extraction system 100, a ground source heat pump system 200, and a cooling tower top steam and water recovery system 300.

[0034] The shallow geothermal energy extraction system 100 includes a buried pipe manifold 101, a geothermal well 102, a buried pipe 103, a buried pipe collector 104, a geothermal water supply pipeline 105, a geothermal water circulation pump 105a, and a geothermal water return pipeline 106. Depending on the geological conditions, the drilling depth of the geothermal well 102 is 120~300m. At this depth, the underground soil temperature is not affected by the season, and the spacing between each geothermal well is controlled to be more than 5m. The buried pipe is a single-loop U-shaped pipe, placed in the geothermal well, with the gaps filled with soil. The buried pipe material is HDPE (high-density polyethylene), which has excellent durability and corrosion resistance, allowing for long-term stable operation. Each geothermal well 102 contains one single-loop U-shaped buried pipe, commonly with a diameter of DN25 / 32 / 40mm, and the flow velocity inside the pipe is controlled to be within 1.2m / s. Water, referred to as working fluid, flows through the buried pipe 103. This working fluid transfers heat to the underground soil via the buried pipe. The number of buried pipes is calculated based on the heat load from the cooling tower's steam and water loss; therefore, a buried pipe manifold 101 is installed. Each buried pipe is connected to a butterfly valve and a balancing valve to ensure pressure balance across all pipes. After exchanging heat with the soil through the buried pipe 103, the working fluid enters the buried pipe collector 104, and then flows through the geothermal water supply pipeline 105 and the geothermal water circulation pump 105a to supply the ground source heat pump system 200. Return water from the ground source heat pump system flows through the geothermal water return pipeline 106 back to the buried pipe manifold 101, continuing to supply water to the buried pipes.

[0035] The ground source heat pump system 200 consists of a heat pump unit 201 and supply and return water pipelines. The heat pump unit 201 includes a heat pump unit evaporator 201a, a heat pump unit condenser 201b, and a heat pump unit PLC controller 201c. The supply and return water pipelines include an evaporator inlet pipeline 202, an evaporator outlet pipeline 203, a condenser inlet pipeline 204, and a condenser outlet pipeline 205.

[0036] The heat pump unit operates in cooling mode. Its function is to transfer the heat lost from the cooling tower to the working water, which then conducts the heat to the underground soil. The working water exits the heat pump unit's condenser 201b at a temperature of 30°C. It then flows through the condenser outlet pipe 205, the geothermal water return pipe 106, and into the underground water distributor 101. After passing through the underground pipe 103, the 30°C working water is cooled to 20°C by the soil. It then flows into the underground water collector 104, through the geothermal water supply pipe 105, the geothermal water circulation pump 105a, and the condenser inlet pipe 204, supplying water to the heat pump unit's condenser 201b. This cycle repeats continuously.

[0037] The cooling tower top vapor-water recovery system 300 includes a cooling tower top vapor-water recovery device 301, a chilled water inlet pipe 302, a chilled water outlet pipe 303, a cooling tower 304, and a water tank 305. The chilled water outlet temperature is 12℃, which enters the heat pump unit evaporator 201a. After exiting the evaporator, the temperature drops to 7℃, and the chilled water is supplied to the cooling tower top vapor-water recovery device 301 via the evaporator outlet pipe 203, the chilled water circulating pump 302a, and the chilled water inlet pipe 302. Then, the chilled water is supplied to the heat pump unit evaporator 201a again via the chilled water outlet pipe 303 and the evaporator inlet pipe 202, and this cycle repeats continuously. The cooling tower 304 and the water tank 305 are existing auxiliary equipment of the power station.

[0038] Furthermore, the focus of this utility model is on the cooling tower top steam and water recovery device, see reference. Figures 2-5 The device has the following features.

[0039] Example: As shown in the accompanying drawings, the cooling tower top vapor-water recovery device 301 includes a heat exchange tube bundle 301a, a water collection network 301b, a water collection trough 301c, and a water inlet pipe 301d. The cooling tower top vapor-water recovery device 301 is located above the cooling tower cylinder. Cooling tower vapor is discharged outwards from the cylinder. Since the cylinder size is smaller than the tower body size, the dimensions of the heat exchange tube bundle 301a and the water collection network 301b should be slightly larger than the cooling tower body size to facilitate the condensation of lost vapor and water. The heat exchange tube bundle 301a is an "M"-shaped tube bundle to facilitate vapor and water condensation. The tube bundle diameter is DN20~DN50, and the center-to-center spacing is 50~150mm. The specific arrangement is based on calculations for the cooling tower scale. The water collection network 301b of the cooling tower top steam-water recovery device is arranged above the heat exchange tube bundle 301a of the cooling tower top steam-water recovery device and is tied to the heat exchange tube bundle. Its purpose is to disturb the steam-water flow, increase the resistance, and increase the heat exchange area. Water collection tanks 301c and water inlet pipes 301d are installed at lower positions at both ends of the heat exchange tube bundle 301a of the cooling tower top steam-water recovery device to facilitate the discharge of collected condensate into a water pool. The heat exchange tube bundle 301a of the cooling tower top steam-water recovery device is installed on the cooling tower.

[0040] The cooling tower top steam and water recovery device water collection net 301b is made of 5mm stainless steel mesh, the water collection tank 301c is made of stainless steel and has a width of not less than 800mm, and the water inlet pipe 301d has a diameter of not less than 150mm. Multiple water inlet pipes can be set according to the scale of the cooling tower.

[0041] Through the above specific implementation scheme, the effect of recovering steam and water from the cooling tower can be achieved by utilizing geothermal energy. The above description is merely a preferred embodiment of this utility model patent, but this utility model patent is not limited to the specific embodiments described above. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these all fall within the protection scope of this utility model patent.

Claims

1. A system for recovering steam and water from the top of a waste heat power plant cooling tower using a ground source heat pump, characterized in that: The system includes a shallow geothermal energy extraction system, a ground source heat pump system, and a cooling tower top steam and water recovery system; the output end of the shallow geothermal energy extraction system is connected to the ground source heat pump system, and the output end of the ground source heat pump system is connected to the cooling tower top steam and water recovery system, wherein: The shallow geothermal energy extraction system includes a geothermal well, a buried pipe installed in the geothermal well, a buried pipe manifold connected to the input end of the buried pipe, a geothermal water return pipe connected to the buried pipe manifold, a buried pipe collector connected to the output end of the buried pipe, a geothermal water supply pipe connected to the buried pipe collector, and a geothermal water circulation pump connected to the geothermal water supply pipe. The ground source heat pump includes a heat pump unit, which includes an evaporator, a condenser, and a PLC controller. The evaporator, condenser, and PLC controller are located inside the heat pump unit. The input end of the evaporator is connected to an evaporator inlet pipe, and the output end of the evaporator is connected to an evaporator outlet pipe. The input end of the condenser is connected to a condenser inlet pipe, and the output end of the condenser is connected to a condenser outlet pipe. The cooling tower top vapor-water recovery system includes a cooling tower top vapor-water recovery device, a chilled water inlet pipe, a chilled water outlet pipe, a cooling tower, and a water tank; the cooling tower top vapor-water recovery device includes a cooling tower top vapor-water recovery device heat exchange tube bundle, a cooling tower top vapor-water recovery device water collection network, a water collection trough, and a water inlet pipe; wherein: The input end of the cooling tower top vapor-water recovery device is connected to the chilled water inlet pipe, and the output end of the cooling tower top vapor-water recovery device is connected to the chilled water outlet pipe. A chilled water circulating pump is connected to the chilled water inlet pipe, and the chilled water circulating pump is connected to the evaporator outlet pipe. The water collection network of the cooling tower top vapor-water recovery device is arranged on the heat exchange tube bundle of the cooling tower top vapor-water recovery device. The water collection tank is arranged at a lower position on both sides of the heat exchange tube bundle of the cooling tower top vapor-water recovery device to collect condensate. The water inlet pipe is connected to one end of the water collection tank, and the other end is led to the water pool.

2. The system for recovering steam and water from the top of a waste heat power plant cooling tower using a ground source heat pump according to claim 1, characterized in that: The heat exchange tube bundle of the cooling tower top steam-water recovery device is an "M" type tube bundle with a tube diameter of DN20~DN50 and a tube center spacing of 50~150mm.

3. A system for recovering steam and water from the top of a waste heat power plant cooling tower using a ground source heat pump, as described in claim 1, is characterized in that: The cooling tower top steam and water recovery device uses a 4mm~10mm stainless steel mesh for the water collection network, the water collection trough is made of stainless steel with a width of 700mm~900mm, and the water inlet pipe has a diameter of 100mm~150mm.

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