Heat pump unit suitable for mine water

Abstract

The invention discloses a heat pump unit suitable for mine water, and relates to the technical field of heat pump units, the heat pump unit comprises a pumping water taking assembly, a primary purification assembly, an evaporator assembly and a condenser assembly, the pumping water taking assembly comprises a delivery pump and a delivery pipe which are arranged at a wellhead, and the evaporator assembly comprises primary evaporators which are arranged in parallel; the condenser assembly is used for outputting a heat source and a cold source, a pipeline purification assembly is arranged on one side of the first-stage evaporator and comprises a moving track arranged in a heat pump workshop, the pipeline purification assembly further comprises a treatment platform arranged on the moving track, a descaling pool is arranged on the treatment platform, and a spare part descaling auxiliary assembly is arranged on the descaling pool. The special pipeline purification assembly is specially arranged, especially the design of a movable track and a processing platform provides a special and movable physical space and an operation platform for offline cleaning and maintenance of key heat exchange components such as a first-stage evaporator, and the problem that large components in a heat pump workshop are inconvenient to clean is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump units. BACKGROUND

[0002] Heat pump technology is a high-efficiency heat transfer system based on the principle of reverse Carnot cycle, which drives the refrigerant to circulate in the four core components of evaporator, compressor, condenser and expansion valve by consuming a small amount of electric energy: first, the low-temperature and low-pressure liquid refrigerant absorbs the low-temperature heat energy of the environment medium (air, water or soil) in the evaporator and evaporates into gas; then, the gas is pressurized and heated by the compressor and enters the condenser, releasing the heat energy carried to the water or air, and itself condensing into high-pressure liquid; finally, the liquid is throttled and decompressed by the expansion valve, and returns to the evaporator to complete the cycle. The essence of this technology is a "heat carrier" rather than an energy producer, which can drive the refrigerant to "extract" 2-4 free environmental heat energy from the low-temperature heat source with 1 unit of electric energy, achieving a 3-4 times energy efficiency ratio, which is significantly better than traditional electric heating or fossil fuel equipment. Its core value lies in converting the widely existing low-grade natural heat source into usable medium-high temperature heat energy, while having the functions of refrigeration, heating and hot water supply, which can significantly reduce energy consumption and carbon emissions in building heating, industrial processes, agricultural drying and other fields, and become a key technology to replace fossil energy in energy transformation.

[0003] Ordinary heat pumps represented by air source achieve heat transfer through four links of compression, condensation, throttling and evaporation, and rely on jet enhancement and intelligent defrosting to maintain operation in low-temperature environment, with a COP of usually 2.5-4.0 but significantly affected by temperature fluctuations. Mine water heat pump uses mine water with constant temperature (12-25℃) and abundant flow as heat source, realizes energy transfer through a two-stage heat exchange system (mine water releases heat to refrigerant, and refrigerant is compressed to heat the heating circuit), and has no low-temperature attenuation and defrosting requirement, and can also meet the cooling demand in summer through heat recovery design. Although ordinary heat pumps have low initial investment and are widely applicable, their energy efficiency decreases significantly in severe cold regions, so mine water heat pump is preferred when conditions permit.

[0004] However, mine water contains sulfides, suspended solids and minerals, which can cause calcification and blockage of heat exchangers, and frequent replacement of components, and requires water treatment, recharge facilities and intelligent control modules, so the initial cost is much higher than that of air source heat pump, which brings trouble to the promotion of mine water heat pump. SUMMARY

[0005] The purpose of the present application is to solve the above technical problems, and the present application provides a heat pump unit suitable for mine water.

[0006] In order to achieve the above purpose, the present application specifically adopts the following technical scheme: The utility model provides a kind of heat pump unit suitable for mine water, including pumping water intake assembly, primary purification assembly, evaporator assembly, condenser assembly, the pumping water intake assembly includes the delivery pump and delivery pipe being located at wellhead, the evaporator assembly includes the parallelly arranged primary evaporator, 2 the primary evaporator is connected with primary purification assembly by three-way and well water backwater output end is hit back into well by pipeline, 2 the primary evaporator output end is connected with condenser assembly by three-way, and the condenser assembly is used to output heat source and cold source, and pipeline purification assembly is provided at the side of the primary evaporator, and the pipeline purification assembly includes the mobile track being located at heat pump workshop, further including the processing platform being equipped with on the mobile track, the descaling pool is equipped with on the processing platform, and spare part descaling auxiliary assembly is equipped with on the descaling pool. Through the above scheme, its working process begins with pumping water intake assembly, which leads mine water out through the delivery pump and delivery pipe at wellhead. The mine water then enters the primary purification assembly for preliminary treatment. The treated water is then split through a three-way junction and enters two parallel primary evaporators for heat exchange. The water after heat exchange is then discharged through another three-way junction. The condenser assembly uses the heat absorbed from the evaporator to output heat source or cold source. With the parallel primary evaporator design, one evaporator can be online while the other can be offline for maintenance or cleaning, improving the system's continuous operation capability and availability. The specially designed pipeline purification assembly, especially the design with a mobile track and a processing platform, provides a dedicated and mobile physical space and operation platform for the offline cleaning and maintenance of key heat exchange components such as primary evaporators, solving the problem of cleaning large components in the heat pump workshop.

[0007] Further, the primary purification assembly includes a transfer box connected to the delivery pipe, the transfer box is provided with multiple levels of filter screens, the transfer box is provided with a water outlet pipe connected to the evaporator assembly, the transfer box is provided with an electronic pH meter and a conductivity sensor, the transfer box is provided with a blowdown pump, the output end of the blowdown pump is provided with a blowdown pipe leading to the outside, and a central controller is further provided, the electronic pH meter and the conductivity sensor are electrically connected to the central controller. Through the above scheme, mine water enters the transfer box from the delivery pipe, and the multiple levels of filter screens provided in the box sequentially intercept suspended particulate matter. At the same time, the electronic pH meter and the conductivity sensor monitor water quality parameters in real time. The central controller determines the water quality condition according to the sensor data. When the water quality exceeds the preset threshold, the controller starts the blowdown pump to discharge the accumulated impurities and part of the sewage in the transfer box outside the system through the blowdown pipe. The automation and intelligence of primary purification are realized, the multiple levels of filter screens effectively remove large particles to protect subsequent equipment, real-time water quality monitoring combined with automatic blowdown significantly improves the effect and reliability of water source pretreatment, reduces the scaling and corrosion pressure of subsequent evaporators, and provides a basic guarantee for the stable operation of the entire system.

[0008] Further, the descaling pool comprises a buffer part and a cleaning part, the transfer box inlet and outlet pipeline is provided with an electric stop valve, the pipeline of the two first evaporator well water return output ends is also provided with an electromagnetic three-way valve, the inlet and outlet end ports in the cleaning part are provided with a folding pipeline, the blowdown pipe is also provided with an electromagnetic three-way valve, and the folding pipeline is matched with the electromagnetic three-way valve ports on the blowdown pipe and the two first evaporator output end three-way valve ports. Through the above scheme, the buffer part is used for temporarily storing the evaporator to be cleaned or cleaned, and the cleaning part is used for actual chemical cleaning. The inlet and outlet water of the transfer box is controlled by the electric stop valve, and the flow direction of the first evaporator input and output end and the access of the descaling pool buffer part / cleaning part is controlled by the electromagnetic three-way valve. The key design lies in the use of folding pipelines, which can be stretched to connect to the electromagnetic three-way valve ports on the blowdown pipe and the three-way valve ports of the first evaporator well water return output end. The working process is as follows: when a certain first evaporator needs to be cleaned, the evaporator is isolated from the main waterway by controlling the related electromagnetic three-way valve and electric stop valve; at the same time, the input and output ends of the evaporator are connected to the input and output ends of the cleaning part through the folding pipeline, forming a closed cleaning loop. The three-way valve on the blowdown pipe can guide the cleaning waste liquid into the blowdown system, and another mode is to guide the cleaning agent into the cleaning part-transfer box-two first evaporators-cleaning part internal washing liquid circulation through the valve to close the transfer box, which can continuously clean the related pipelines and evaporators. Highly flexible pipeline connection is realized, so that a single first evaporator can quickly and conveniently access or separate from the descaling pool for offline circulating cleaning, without the need for complex hard pipe disassembly, greatly simplifying the cleaning operation process and improving the maintenance efficiency.

[0009] Further, the descaling pool is provided with an auxiliary circulating pump, the auxiliary circulating pump is connected to the output end of the cleaning part, the cleaning part is filled with multifunctional cleaning agent, and the multifunctional cleaning agent comprises an acid cleaning agent, a corrosion inhibitor, a surfactant and a promoter. Through the above scheme, the cleaning part is pre-filled with a multifunctional cleaning agent composed of an acidic cleaning agent, a corrosion inhibitor, a surfactant and a promoter. The concentrated liquid tank provided on the treatment platform stores high-concentration cleaning agent stock solution. The discharge valve with a metering scale can be used to add stock solution to the descaling tank to adjust the concentration of the cleaning solution. The auxiliary circulating pump is installed at the output end of the cleaning part. Its function is to drive the cleaning solution to flow between the offline primary evaporator and the cleaning part after the cleaning circuit is formed. After connecting the evaporator to be cleaned to the cleaning part circuit, start the auxiliary circulating pump to make the cleaning solution circulate between the evaporator pipeline and the cleaning part. The chemical action is used to dissolve and strip the scale and dirt inside the evaporator. The provided effective chemical cleaning capacity can efficiently remove various types of dirt and protect the equipment material. The concentrated liquid tank and the metering discharge valve ensure accurate control of the cleaning solution concentration. The auxiliary circulating pump ensures that the cleaning solution has sufficient flow rate and scouring force in the heat exchange pipeline, improving the cleaning efficiency and uniformity.

[0010] Further, the primary evaporator is connected with the three-way joint through a quick release joint. Through the above scheme, when a certain evaporator needs to be offline for cleaning or maintenance, the operator can quickly manually release the quick release joint to disconnect the evaporator from the main pipeline. After maintenance, it can be quickly reconnected. This greatly simplifies the connection and separation operation of the evaporator and the main pipeline, greatly shortens the disassembly and installation time, and improves the efficiency of maintenance operation. It is a key supporting component for realizing the quick offline cleaning and maintenance of the evaporator.

[0011] Further, the spare part descaling auxiliary assembly includes a hanging rail provided on the descaling tank, the hanging rail extends to the outside of the descaling tank, a lifting sling is provided on the hanging rail, and a lifting net is connected to the hook of the lifting sling. Through the above scheme, when the primary evaporator needs to be cleaned or maintained, the operator uses the lifting sling and the lifting net to lift it from the installation position and move it to the cleaning part above the descaling tank to put it into the cleaning liquid, or move it out of the descaling tank for other operations. After cleaning, it is lifted back to the original position or the buffer part. A safe, convenient and labor-saving lifting and transporting means is provided for heavy or bulky parts, greatly facilitating the disassembly, movement and placement of the equipment in different areas of the descaling tank.

[0012] Further, the transfer box is wrapped with a plurality of porous plastic temperature insulation layers, and the transfer box is a metal box body with a corrosion-resistant plastic layer on the inner wall. Through the above scheme, the metal box body provides structural strength, and the corrosion-resistant plastic layer on the inner wall directly contacts the mine water to resist its corrosiveness. The corrosion-resistant lining significantly prolongs the service life of the transfer box and resists the chemical corrosion of the mine water. The heat preservation layer helps to maintain the relative stability of the water temperature.

[0013] Further, the processing platform is provided with a driving motor for driving the platform to move along the moving track.

[0014] Through the above scheme, the processing platform is provided with a driving motor, so that the processing platform has the ability to move along the moving track autonomously.

[0015] Further, the cleaning part is provided with a filter cage.

[0016] Through the above scheme, when chemical cleaning is performed, the physical filter removed from the primary evaporator or other components can be placed in the filter cage, and then immersed in the cleaning liquid in the cleaning part. The cleaning of the filter is integrated into the function of the pipeline purification assembly, and a centralized and efficient place and method for offline cleaning of the filter is provided.

[0017] The beneficial effects of the present application are as follows: 1. The present application discloses a heat pump unit suitable for mine water, which draws mine water out through a delivery pump and a delivery pipe at a wellhead. The mine water then enters a primary purification assembly for preliminary treatment. The treated water is divided by a tee joint and enters two primary evaporators arranged in parallel for heat exchange. The water after heat exchange is discharged through another tee joint. The condenser assembly uses the heat absorbed from the evaporator to output heat source or cold source. Through the design of parallel primary evaporators, one evaporator can be online while the other can be offline for maintenance or cleaning, improving the continuous operation capability and availability of the system. The specially designed pipeline purification assembly, especially the design with a moving track and a processing platform, provides a dedicated and movable physical space and operation platform for offline cleaning and maintenance of key heat exchange components such as primary evaporators, solving the problem of inconvenient cleaning of large components in the heat pump workshop. 2. The mine water enters a transfer box through the delivery pipe, and the multiple-stage filter screens provided in the box intercept suspended particulate matter in sequence. At the same time, an electronic pH meter and a conductivity sensor monitor water quality parameters in real time. The central controller judges the water quality condition according to the sensor data. When the water quality exceeds the preset threshold, the controller starts the blowdown pump to discharge the impurities and part of the sewage accumulated in the transfer box outside the system through the blowdown pipe. The primary purification is realized automatically and intelligently, the multiple-stage filter screens effectively remove large particles to protect the subsequent equipment, and the real-time water quality monitoring combined with automatic blowdown significantly improves the effect and reliability of water source pretreatment, reduces the scaling and corrosion pressure of the subsequent evaporator, and provides a basic guarantee for stable operation of the entire system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application; 11, delivery pump; 12, delivery pipe; 13, primary evaporator; 14, moving track; 15, treatment platform; 16, descaling pool; 17, transfer box; 18, multi-stage filter screen; 19, water outlet pipe; 20, electronic pH meter; 21, conductivity sensor; 22, blowdown pump; 23, blowdown pipe; 24, buffer section; 25, cleaning section; 26, electric shut-off valve; 27, electromagnetic three-way valve; 28, folding pipe; 29, auxiliary circulating pump; 30, concentrated liquid tank; 31, liquid discharge valve; 32, hoisting track; 33, hoisting sling; 34, hoisting net; 35, driving motor; 36, filter screen cage. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0021] Embodiment 1 As Figure 1As shown, the embodiment provides a heat pump unit suitable for mine water, comprising a pumping water taking assembly, a primary purification assembly, an evaporator assembly, and a condenser assembly. The pumping water taking assembly comprises a delivery pump 11 and a delivery pipe 12 arranged at the wellhead. The delivery pipe 12 is connected to the primary purification assembly. The evaporator assembly comprises two primary evaporators 13 connected in parallel. The two primary evaporators 13 are connected to the output end of the primary purification assembly through a tee joint. The output end of the two primary evaporators 13 is connected to the condenser assembly through a tee joint. The water output end of the well is connected to the well through a pipeline. The water return end of the two primary evaporators 13 is connected to the wellhead. The condenser assembly is used to output heat source and cold source. A pipeline purification assembly is arranged on one side of the primary evaporator 13. The pipeline purification assembly comprises a mobile track 14 arranged in the heat pump workshop. The pipeline purification assembly further comprises a treatment platform 15 arranged on the mobile track 14. The treatment platform 15 is provided with a driving motor 35 for driving the platform to move along the mobile track 14. The treatment platform 15 is provided with a descaling tank 16. The descaling tank 16 is provided with a spare part descaling auxiliary assembly. The primary purification assembly comprises a transfer box 17 connected to the delivery pipe 12. The transfer box 17 is provided with multiple filter screens 18. The transfer box 17 is provided with a water outlet pipe 19 connected to the evaporator assembly. The transfer box 17 is provided with an electronic pH meter 20 and a conductivity sensor 21. The transfer box 17 is provided with a blowdown pump 22. The output end of the blowdown pump 22 is provided with a blowdown pipe 23 connected to the outside. A central controller is further provided. The electronic pH meter 20, the conductivity sensor 21, and the blowdown pump 22 are electrically connected to the central controller.

[0022] Therefore, the mine water enters the transfer box 17 from the conveying pipe 12, and the multi-stage filter screen 18 provided in the box successively intercepts suspended particulate matter. At the same time, the electronic pH meter 20 and the conductivity sensor 21 monitor the water quality parameters in real time. The central controller judges the water quality condition according to the sensor data. When the water quality exceeds the preset threshold, the controller starts the blowdown pump 22 to discharge the impurities and part of the sewage accumulated in the transfer box 17 outside the system through the blowdown pipe 23. The automation and intelligentization of primary purification are realized, the multi-stage filter screen 18 effectively removes large-particle impurities to protect the subsequent equipment, the real-time water quality monitoring combined with automatic blowdown significantly improves the effect and reliability of water source pretreatment, reduces the scaling and corrosion pressure of the subsequent evaporator, and provides a basic guarantee for the stable operation of the entire system. The working process starts from the pumping water assembly, which introduces the mine water out of the wellhead through the conveying pump 11 and the conveying pipe 12. The mine water then enters the primary purification assembly for preliminary treatment. The treated water is divided through a three-way branch and enters two parallel first-stage evaporators 13 for heat exchange. The water after heat exchange is discharged through the other end of the converging three-way branch. The condenser assembly uses the heat absorbed from the evaporator as a heat source or cold source. Through the design of the parallel first-stage evaporators 13, one evaporator can be online while the other can be offline for maintenance or cleaning, improving the continuous operation capability and availability of the system. The treatment platform 15 increases the driving motor 35, enabling it to move autonomously on the moving track 14. The specially designed pipe purification assembly, especially with the moving track 14 and the treatment platform 15, provides a dedicated and movable physical space and operation platform for the offline cleaning and maintenance of key heat exchange components such as the first-stage evaporator 13, solving the problem of inconvenient cleaning of large components in the heat pump workshop.

[0023] Referring to Figure 1 , the descaling tank 16 includes a buffer part 24 and a cleaning part 25, the transfer box 17 is provided with an electric shut-off valve 26 on the inlet and outlet pipe, the two first-stage evaporators 13 are provided with an electromagnetic three-way valve 27 at the well water return three-way branch, and the main pipe of the well water return output end of the two first-stage evaporators 13 is also provided with an electromagnetic three-way valve 27. The inlet and outlet ports of the cleaning part 25 are provided with a folding pipe 28, and the blowdown pipe 23 is also provided with an electromagnetic three-way valve 27. The folding pipe 28 is adapted to the ports of the electromagnetic three-way valves 27 on the blowdown pipe 23 and the main pipe output end of the well water return pipe of the two first-stage evaporators 13.

[0024] Referring to Figure 1, in order to improve the applicability of the device, the primary evaporator 13 is connected with the three-way through quick release joint, the transfer box 17 is wrapped with multiple porous plastic temperature insulation layer (not shown in the figure), the transfer box 17 adopts metal box body and the inner wall is provided with corrosion-resistant plastic layer (not shown in the figure). When a certain primary evaporator 13 needs to be offline for cleaning or maintenance, the operator can quickly manually loosen the quick release joint to disconnect the evaporator and the main pipeline. After maintenance, it can be quickly connected again. Greatly simplify the connection and separation operation of the primary evaporator 13 and the main pipeline, greatly shorten the disassembly and installation time, improve the efficiency of maintenance operation, and is the key supporting component to realize the rapid offline cleaning and maintenance of the evaporator. The metal box body provides structural strength, and the corrosion-resistant plastic layer on the inner wall directly contacts the mine water, resists its corrosion, and the corrosion-resistant lining significantly prolongs the service life of the transfer box 17, resists the chemical corrosion of the mine water; the heat preservation layer helps to maintain the relative stability of the water temperature.

[0025] Therefore, the cache unit 24 is used to temporarily store the evaporator to be cleaned or cleaned, and the cleaning unit 25 is used for actual chemical cleaning. The inlet and outlet of the transfer box 17 are controlled by the electric shut-off valve 26, and the flow direction of the input and output end of the primary evaporator 13 and the access of the descaling tank 16 cache unit 24 / cleaning unit 25 are controlled by the electromagnetic three-way valve 27. The key design is the use of folding pipelines 28, which can be extended to connect the electromagnetic three-way valve 27 port on the blowdown pipe 23 and the three-way valve port of the primary evaporator 13 well water return output end. The working process is as follows: when a certain primary evaporator 13 needs to be cleaned, the evaporator is isolated from the main waterway by controlling the relevant electromagnetic three-way valve 27 and electric shut-off valve 26, specifically by controlling the electromagnetic three-way valve 27 at the primary evaporator well water inlet main pipe and two branch pipes, and simultaneously controlling the electromagnetic three-way valve 27 at the well water return output end main pipe and two branch pipes, realizing the control of the well water and the isolation of the primary evaporator 13; at the same time, the isolated primary evaporator 13 is quickly disassembled through the quick release joint, and the input and output ends of the evaporator are connected to the input and output ends of the cleaning unit 25 through the folding pipeline 28, forming a closed cleaning loop. The three-way valve on the blowdown pipe 23 can guide the cleaning waste liquid into the blowdown system.

[0026] At the same time, another mode is to close the transfer box 17 through the valve, that is, the electric shut-off valve 26 closes the water inlet end of the transfer box 17, and the electromagnetic three-way valve 27 connected to the drain pipe 23 through the folding pipeline 28 and the electromagnetic three-way valve 27 on the primary evaporator 13, so that the cleaning agent is introduced to form the internal washing liquid circulation of the cleaning part 25-transfer box 17-two primary evaporators 13-cleaning part 25, which continuously cleans the related pipelines and evaporators. Highly flexible pipeline connection is achieved, so that a single primary evaporator 13 can be quickly and conveniently connected to or separated from the descaling tank 16 for offline circulation cleaning without the need for complex hard pipe disassembly, greatly simplifying the cleaning operation process and improving the maintenance efficiency.

[0027] Referring to Figure 1 , the descaling tank 16 is provided with an auxiliary circulating pump 29, the auxiliary circulating pump 29 is connected to the output end of the cleaning part 25 and connected with the folding pipeline 28, the cleaning part 25 is filled with multifunctional cleaning agent, and the multifunctional cleaning agent includes acid cleaning agent, corrosion inhibitor, surfactant, and promoter. The treatment platform 15 is provided with a concentrated liquid tank 30, the concentrated liquid tank 30 is provided with a metering scale (not shown in the figure) and a liquid discharge valve 31 connected to the descaling tank 16. The cleaning part 25 is pre-filled with multifunctional cleaning agent composed of acid cleaning agent, corrosion inhibitor, surfactant, and promoter. The concentrated liquid tank 30 provided on the treatment platform 15 stores high-concentration cleaning agent stock solution, and the liquid discharge valve 31 with a metering scale can quantitatively add stock solution to the descaling tank 16 to adjust the concentration of the cleaning liquid as required. The auxiliary circulating pump 29 is installed at the output end of the cleaning part 25, which drives the cleaning liquid to flow between the offline primary evaporator 13 and the cleaning part 25 after the cleaning circuit is formed. After the evaporator to be cleaned is connected to the cleaning part 25 circuit, the auxiliary circulating pump 29 is started to make the cleaning liquid continuously circulate between the evaporator pipeline and the cleaning part 25, and the chemical action is used to dissolve and strip the scale and dirt inside the evaporator. Provide effective chemical cleaning capacity, and the compounded cleaning agent can efficiently remove various types of dirt and protect the equipment material. The concentrated liquid tank 30 and the metering liquid discharge valve 31 ensure the accurate control of the concentration of the cleaning liquid. The auxiliary circulating pump 29 ensures that the cleaning liquid has sufficient flow rate and scouring force in the heat exchange pipeline, improving the cleaning efficiency and uniformity.

[0028] Referring to Figure 1 , in order to facilitate cleaning, a filter cage 36 is arranged in the cleaning part 25, and a plurality of layers of filter screens are inserted into the filter cage 36. When chemical cleaning is performed, the physical filter screens removed from the primary evaporator 13 or other components can be placed in the filter cage 36, and then immersed in the cleaning liquid in the cleaning part 25. The cleaning of the filter screen is also integrated into the function of the pipeline purification assembly, providing a centralized and efficient place and method for offline cleaning of the filter screen.

[0029] Referring to Figure 1The spare part descaling auxiliary assembly includes a hanging rail 32 arranged on the descaling pool 16, the hanging rail 32 extending to the outside of the descaling pool 16, a lifting sling 33 arranged on the hanging rail 32, and a lifting net 34 connected to the lifting sling 33. When the primary evaporator 13 needs to be cleaned or maintained, the lifting sling 33 and the lifting net 34 are used to lift the primary evaporator 13 from the installation position, move to the cleaning liquid in the cleaning part 25 of the descaling pool 16 along the hanging rail 32, or move out of the descaling pool 16 for other operations. After cleaning, the primary evaporator 13 is lifted back to the original position or the buffer part 24. A safe, convenient and labor-saving lifting and transportation means is provided for heavy or bulky parts, greatly facilitating the disassembly, movement and placement of the equipment in different areas of the descaling pool 16.

[0030] Specific cases Application of mine water heat pump unit in a certain coal mine in central Hebei Scenario requirements The mine area needs to recover 14-16 ℃ mine water (water inflow 200 m³ / h) for heating of 60,000 m² of buildings, while solving the problem of more than 30 days of annual downtime caused by evaporator scaling.

[0031] I. Equipment configuration Pumping water assembly A 200 m³ / h delivery pump 11 (CDL200-20 of Nanfang Pump Industry) is arranged at the wellhead and connected to the workshop through a DN200 stainless steel delivery pipe 12.

[0032] Primary purification assembly A three-stage filter screen is arranged in the transfer box 17 (3 m x 2 m x 2 m): a 20-mesh coarse filter (intercepting >1 mm rock debris) + a 50-mesh fine filter (removing >0.3 mm coal powder) + a 100-μm self-cleaning filter screen. The inner wall of the box is lined with a 5-mm-thick PP corrosion-resistant layer, and the outer surface is covered with an 80-mm polyurethane foam insulation layer. An electronic pH meter 20 (FE28 of Mettler) and a conductivity sensor 21 (CLS82D of Endress) are used for real-time monitoring, and the data are transmitted to a Siemens S7-1200 PLC controller.

[0033] Evaporator assembly Two titanium alloy plate-type primary evaporators 13 (T20 of Alpha Valves, with a single heat exchange capacity of 1.5 MW) are connected to the three-way pipe through a clamp quick-release joint.

[0034] Pipe purification assembly A moving rail 14 (I-beam QU80, 15 m long) carries a treatment platform 15 (4 m x 3 m in size). The descaling pool 16 is divided into a buffer part 24 (3 m³ in volume) and a cleaning part 25 (2 m³ in volume), and a 304 stainless steel filter screen cage 36 (3 layers of filter screens can be inserted) is embedded in the descaling pool 16. The cleaning section 25 is pre-stored with a composite cleaning agent (8% aminosulfonic acid + 0.5% LAN-826 corrosion inhibitor + 0.2% penetrant JFC); Concentrate tank 30 (1m³) with scale and pneumatic drain valve 31 (ASCO 8210G).

[0035] 2. Workflow (1) Normal operation stage The mine water is diverted through the delivery pump 11 → delivery pipe 12 → transfer box 17 → electromagnetic three-way valve 27 to two first-stage evaporators 13 → absorbs heat and cools to 8-10℃ → the condenser outputs 55℃ hot water for heating.

[0036] (2) Descaling stage of the first-stage evaporator 13 Offline isolation The PLC detects that the pressure difference between the inlet and outlet of the first-stage evaporator 13 is greater than 0.15 MPa (preset threshold), triggering an alarm; Close the electric stop valve 26 at the outlet of the transfer box 17, switch the inlet and outlet electromagnetic three-way valves 27 of the 1# first-level evaporator 13, and cut off its connection with the main water channel.

[0037] (At this time, the 2# first-stage evaporator 13 operates independently, and the system heating capacity is reduced to 50%) Quick access cleaning system The operator starts the drive motor 35 to move the processing platform 15 to the bottom of the first-stage evaporator 13; Loosen the quick-release connector and use the hoisting hoist 33 to lift the primary evaporator 13 into the cache 24 of the descaling tank 16; The folded pipe 28 is stretched to connect the port of the first-stage evaporator 13 and the electromagnetic three-way valve 27 of the cleaning part 25 .

[0038] Cycle cleaning Open the drain valve 31 of the concentrate tank 30 and add cleaning agent to the cleaning section 25 to a concentration of 10%; Start the auxiliary circulation pump 29 and circulate at a flow rate of 30m³ / h for 2 hours.

[0039] Waste liquid treatment and relocation The sewage pump 22 discharges the waste liquid to the neutralization tank through the folding pipe; After flushing with clean water three times, hoist the first-stage evaporator 13 to its original position and restart the main system.

[0040] (3) Evaporator shutdown maintenance stage The operator starts the driving motor 35, moves the treatment platform 15 to the sewage pump 22, closes the liquid inlet end of the transfer box 17 while emptying the liquid, extends the folding pipeline 28 to connect to the electromagnetic three-way valve 27 on the sewage pump 22 as the circulating end, closes the electromagnetic three-way valve 27 on the pipeline of the water return output end of the two primary evaporators 13, extends the folding pipeline 28 to connect to the electromagnetic three-way valve 27 on the pipeline of the water return output end of the primary evaporator 13, introduces the cleaning agent in the cleaning part 25 into the transfer box 17, and realizes the washing liquid circulation through the sewage pump 22, and the washing liquid forms the internal washing liquid circulation of the cleaning part 25-transfer box 17-two primary evaporators 13-cleaning part 25, and continuously cleans the related pipelines and evaporators for 2 hours.

[0041] III. Verification of technical effects Table 1.1 Comparison table before and after heat pump transformation.

[0042]

[0043] According to the above table, after the transformation, offline maintenance without shutdown is realized, the maintenance speed is greatly improved, and the influence on production is reduced, which has great economic significance.

[0044] Technical advantages: parallel primary evaporator 13 + quick release design: realize single offline maintenance without interrupting heating; at the same time, the folding pipeline 28 can be connected to the electromagnetic three-way valve 27 on the sewage pump 22 as the circulating end, the electromagnetic three-way valve 27 on the pipeline of the water return output end of the two primary evaporators 13 is closed, the folding pipeline 28 is connected to the electromagnetic three-way valve 27 on the pipeline of the water return output end of the primary evaporator 13, the cleaning agent in the cleaning part 25 is introduced into the transfer box 17, and the washing liquid circulation is realized through the sewage pump 22, and the washing liquid forms the internal washing liquid circulation of the cleaning part 25-transfer box 17-two primary evaporators 13-cleaning part 25, and continuously cleans the related pipelines and evaporators for 2 hours.

[0045] Movable purification platform: through track positioning and folding pipeline 28, the connection between the primary evaporator 13 and the cleaning system is completed within 10 minutes; Intelligent cleaning control: pH / conductivity real-time feedback adjusts the cleaning end point to avoid excessive corrosion.

[0046] It should be noted that the connection relationship of the components not specifically mentioned in the present application is defaulted to be the prior art, since it does not involve the invention point and is generally applied in the prior art, and therefore the structure connection relationship is not described in detail.

Claims

1. A heat pump unit suitable for mine water, characterised in that, The utility model provides a kind of water pumping system, including pumping water component, primary purification component, evaporator component, condenser component, the pumping water component includes the delivery pump (11) being arranged at wellhead and delivery pipe (12), the delivery pipe (12) is connected into primary purification component, the evaporator component includes parallelly arranged primary evaporator (13), 2 the primary evaporator (13) is connected with primary purification component by tee and well water backwater output end is punched back into well by pipeline, 2 the primary evaporator (13) output end is connected with condenser component by tee, and the condenser component is used to output heat source and cold source, and pipeline purification component is arranged on the side of the primary evaporator (13), and the pipeline purification component includes the mobile track (14) being arranged in heat pump workshop, and further including the processing platform (15) being arranged on the mobile track (14), the descaling pool (16) is arranged on the processing platform (15), and the spare descaling auxiliary assembly is arranged on the descaling pool (16).

2. A heat pump unit suitable for use with mine water according to claim 1, characterised in that, The primary purification component includes the transfer box (17) being connected with delivery pipe (12), the transfer box (17) is equipped with multistage filter screen (18) in, the transfer box (17) is equipped with water outlet pipe (19) and evaporator component is connected, the transfer box (17) is equipped with electronic pH meter (20) and conductivity sensor (21) in, the transfer box (17) is equipped with blowdown pump (22), the blowdown pump (22) output end is equipped with blowdown pipe (23) leading to outside, and a central controller is further arranged, and the electronic pH meter (20) and conductivity sensor (21) and the blowdown pump (22) are electrically connected with the central controller.

3. A heat pump unit suitable for use with mine water according to claim 2, characterised in that, The descaling pool (16) includes buffer part (24) and cleaning part (25), the transfer box (17) inlet and outlet pipeline is equipped with electric stop valve (26), the pipeline of the well water backwater output end of 2 the primary evaporator (13) is equipped with electromagnetic three-way valve (27), the inlet and outlet end port of the cleaning part (25) is equipped with folding pipeline (28), the blowdown pipe (23) is also equipped with electromagnetic three-way valve (27), and the folding pipeline (28) is adapted with the port of the electromagnetic three-way valve (27) on the blowdown pipe (23) and the port of the electromagnetic three-way valve (27) on the output end of 2 the primary evaporator (13).

4. A heat pump unit suitable for use with mine water according to claim 3, characterised in that, The descaling pool (16) is equipped with auxiliary circulating pump (29), the auxiliary circulating pump (29) is connected to the output end of the cleaning part (25), the cleaning part (25) is filled with multifunctional cleaning agent, and the multifunctional cleaning agent includes acid cleaning agent, corrosion inhibitor, surfactant and promoter, the processing platform (15) is equipped with concentrated liquid tank (30), the concentrated liquid tank (30) is equipped with metering scale and drain valve (31) leading into the descaling pool (16).

5. A heat pump unit suitable for use with mine water according to claim 4, characterised in that, The primary evaporator (13) is connected with tee by quick release joint.

6. A heat pump unit suitable for use with mine water according to claim 3, wherein, The spare part descaling auxiliary assembly comprises a hanging rail (32) arranged on the descaling pool (16), the hanging rail (32) extends to the outside of the descaling pool (16), and a lifting sling (33) is arranged on the hanging rail (32), and a lifting net (34) is connected to the hook of the lifting sling (33).

7. A heat pump unit suitable for use with mine water according to claim 2, characterised in that, The transfer box (17) is wrapped with a plurality of porous plastic temperature insulation layers, and the transfer box (17) is a metal box body with a corrosion-resistant plastic layer on the inner wall.

8. A heat pump unit suitable for use with mine water according to claim 1, wherein, A driving motor (35) is arranged on the processing platform (15) to drive the platform to move along the moving track (14).

9. A heat pump unit suitable for use with mine water according to claim 3, characterised in that, A filter screen cage (36) is arranged in the cleaning part (25).

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