Modularized phase change heat storage recovery system and method adaptive to mine multi-type compressors

Abstract

The modular phase change heat storage recovery system comprises a compressor heat source unit, a phase change heat storage heat recovery unit, a phase change heat storage heat recovery unit and a phase change heat storage heat recovery unit, the modular phase change heat storage unit is used for storing condensation heat of different temperature grades; the heat energy output unit is used for conveying the stored heat as required to realize gradient utilization of the heat; the intelligent regulation and control unit is connected with the compressor heat source unit, the modularized phase change heat storage unit and the heat energy output unit, the condensation heat temperature from the compressor heat source unit is detected and recognized, and the condensation heat temperature is automatically distributed to the modularized phase change heat storage unit. A module phase change unit heat distribution stage; a phase change heat storage stage; a step heat release stage; and an anomaly detection stage. According to the invention, the condensation heat of the mine can be accurately recovered and distributed as required, so that different heat utilization requirements of the mine can be met, meanwhile, the energy utilization efficiency is improved, the operation cost is reduced, and the environmental pollution is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mine energy recovery, and particularly relates to a modular phase change heat storage recovery system and method suitable for multiple types of compressors in a mine. BACKGROUND

[0002] In a mine operating environment, an air compressor is not only a power source for driving key tools such as a pick, an anchor rod machine, and a slag pump, but also an important part of a gas extraction system, a nitrogen making fire prevention system, and a deep cooling unit. However, a large amount of waste heat is generated during the operation of the compressor, which is usually directly discharged into the underground environment or a circulating water system. Direct discharge not only causes great energy waste, but also significantly increases the heat load of the shaft and the power consumption of the refrigeration unit. Due to the high adaptability and reliability requirements of the mine environment for equipment, different types of compressors have differences in heat recovery, and the existing recovery system is mostly suitable for a single type of compressor, which requires the establishment of repeated systems for different types of compressors, thereby increasing the cost. In addition, the current common sensible heat storage methods such as water tanks and heat-conducting oils have the problems of low heat storage efficiency and large temperature fluctuations.

[0003] Patent No. CN120810074A discloses a phase change heat storage heat and electricity composite low-temperature waste heat recovery method and device, which includes an absorption heat pump, a phase change heat storage heat exchanger, a compressor, etc. The hot water from the heat user is heated by the heat exchanger, the absorption heat pump absorber, and the condenser to supply the user, and the waste heat water enters the phase change heat storage heat exchanger after the absorption heat pump evaporator. The compressor operates to store ice during off-peak electricity, and stops to melt ice during peak electricity. However, the system cannot be compatible with the wide temperature range condensing heat of multiple types of compressors in a mine, and lacks an effective recovery path for the high-temperature condensing heat of a gas extraction compressor. SUMMARY

[0004] The present application aims to provide a modular phase change heat storage recovery system and method suitable for multiple types of compressors in a mine, which can realize accurate recovery and on-demand distribution of condensing heat in a mine to meet different heat demand in the mine, improve energy utilization efficiency, reduce operating costs, and reduce environmental pollution.

[0005] To achieve the above-mentioned purpose, the present application provides a modular phase change heat storage recovery system suitable for multiple types of compressors in a mine, which includes: A compressor heat source unit connected to multiple types of compressors for preliminary collection of condensing heat; A modular phase change heat storage unit storing condensing heat of different temperature levels through a heat storage module; A heat energy output unit for on-demand delivery of heat stored in the heat storage module to heat utilization scenarios in the mine to realize gradient utilization of heat; The intelligent regulation and control unit is connected with the compressor heat source unit, the modular phase change heat storage unit and the heat energy output unit, detects and identifies the condensation heat temperature from the compressor heat source unit, and automatically distributes the condensation heat to the corresponding heat storage module of the modular phase change heat storage unit.

[0006] As a further scheme of the present application, the compressor heat source unit comprises a compressor, a condenser, an expansion valve and an evaporator connected in sequence through pipelines, a temperature sensor one is connected on the pipeline between the condenser and the expansion valve, a condenser cold source outlet is connected with a three-way branch through a pipeline, one branch of the three-way branch is connected with a three-way electromagnetic valve c through an electromagnetic valve V3 and a standby cooling device, the other branch is connected with a three-way electromagnetic valve b through an electromagnetic valve V1, a heat pipe heat exchanger and a temperature sensor two, one branch is connected with the three-way electromagnetic valve b through an electromagnetic valve V5, the other branch is connected with the phase change heat storage unit through an electromagnetic valve V4, the last branch is connected with the phase change heat storage unit through an electromagnetic valve V2, an electromagnetic valve V4 and a classified input interface I, the phase change heat storage unit is connected with the three-way electromagnetic valve b through a classified input outlet I and an electromagnetic valve V6, and the three-way electromagnetic valve a is connected with the condenser cold source inlet through a circulating pump I; The modular phase change heat storage unit comprises high-temperature phase change units, medium-temperature phase change units and low-temperature phase change units connected in parallel, and each of the high-temperature phase change units, the medium-temperature phase change units and the low-temperature phase change units comprises a phase change heat exchanger, an electric heating plate and thermal insulation cotton, and is respectively connected with a temperature sensor three, a temperature sensor four and a temperature sensor five; The heat energy output unit comprises a user end, the user end is connected with a hot user return water through an electromagnetic valve V8, a public return liquid tank, an electromagnetic valve V7, a heat pipe heat exchanger, a classified input interface II and the phase change heat storage unit, forms hot user supply water through heat exchange, and sequentially passes through a classified output interface II, a circulating pump II, a public supply liquid tank and an electromagnetic valve V9 to enter the user end, and completes a heating process; The intelligent regulation and control unit comprises a mine PLC controller and temperature sensors one, two, three, four and five, three-way electromagnetic valves, electromagnetic valves V1, V2, V3, V4, V5, V6, classified input interfaces I and II, classified output interfaces I and II, electromagnetic valves V7, V8 and V9, circulating pumps I and II connected with the mine PLC controller and arranged on pipelines.

[0007] As a further scheme of the present application, the high-temperature phase change unit is adapted to condensation heat temperature of 120-200 DEG C, and is filled with phase change material sodium nitrate-potassium nitrate; The medium-temperature phase change unit is adapted to condensation heat temperature of 60-120 DEG C, and is filled with phase change material paraffin-expanding graphite; The low-temperature phase change unit is adapted to condensing heat temperature of 40-60 ℃, and is filled with a phase change material of decanoic acid-lauric acid.

[0008] As a further scheme of the present application, an electric heating plate is arranged at the bottom of the corresponding phase change unit, heat preservation cotton is arranged outside the corresponding phase change unit, and a phase change heat exchanger is connected to the corresponding phase change unit and communicates inside and outside the phase change unit.

[0009] To achieve the above object, the present application further provides a modular phase change heat storage and recovery method adapted to multiple types of mine compressors, and based on the modular phase change heat storage and recovery system adapted to multiple types of mine compressors, the method comprises the following steps: S1, condensing heat, heat load demand statistics and operation condition judgment stage; S2, module phase change unit heat distribution stage; S3, phase change heat storage stage; S4, step-by-step heat release stage; S5, abnormality detection stage.

[0010] As a further scheme of the present application, the specific process of S1 is as follows: S1.1, system initialization, starting the compressor and the intelligent control unit, and closing all electromagnetic valves in the initial state; S1.2, receiving the heat load demand Q of the user end i , and calculating the load Q m that can be provided by the condensing heat of the compressor; S1.3, the built-in program logic of the mine PLC controller judges the current operation condition: If Q i =0, there is no heat demand condition, electromagnetic valve V2, electromagnetic valve V1 and electromagnetic valve V6 are opened, and the module phase change unit heat distribution stage is entered; If Q i ≠0 and Q i ≤ Q m , the heat demand is less than the heat supply stage, electromagnetic valve V1, electromagnetic valve V1 and electromagnetic valve V6 are opened, and the module phase change unit heat distribution stage is entered; If Q i ≠0 and Q i >Q m , the heat demand is greater than the heat supply stage, electromagnetic valve V1 and electromagnetic valve V5 are opened, and the abnormality processing stage is entered.

[0011] As a further scheme of the present application, the specific process of S2 is as follows: S2.1, temperature sensor two collects the condensate temperature T i in real time, and synchronously transmits the data to the mine PLC controller; S2.2, the built-in program logic of the mine PLC controller judges that the module phase change heat storage unit is entered: When T1> 120℃, open the high-temperature channels of the classification input interface I, the classification input interface II, the classification output interface I, and the classification output interface II, and the condensed liquid flows into the high-temperature phase change unit; When 60℃≤ T1≤ 120℃, open the medium-temperature channels of the classification input interface I, the classification input interface II, the classification output interface I, and the classification output interface II, and the condensed liquid flows into the medium-temperature phase change unit; When T1< 60℃, open the low-temperature channels of the classification input interface I, the classification input interface II, the classification output interface I, and the classification output interface II, and the condensed liquid flows into the low-temperature phase change unit.

[0012] As a further scheme of the present application, the specific process of S3 is: S3.1, the condensed liquid enters the phase change heat exchanger of the corresponding phase change unit, and the heat is transferred to the phase change material through the heat exchange surface, and the phase change material gradually changes from solid to liquid, at this time, latent heat storage is realized; S3.2, the temperature sensor connected to each phase change unit monitors the temperature of the phase change material in real time, and the data is synchronously transmitted to the mine PLC controller; S3.3, the mine PLC controller determines the heat storage stage according to the built-in program logic: When the temperature of the phase change material is greater than or equal to the melting point temperature, a "heat storage complete" signal is sent to the mine PLC controller, and it is determined whether the compressor is running: If the compressor continues to run, open the electromagnetic valve V3, the three-way electromagnetic valve a, b, and c, and close all the other electromagnetic valves, and start the standby cooling equipment; If the compressor ends running, close all the electromagnetic valves, open the electric heating plate, and enter the heat preservation state; detect the temperature of the phase change material, and close the electric heating plate when the temperature reaches the melting point again; When the temperature of the phase change material is less than the melting point temperature, heat storage continues.

[0013] As a further scheme of the present application, the specific process of S4 is: The mine PLC controller receives the heat demand of the user end, and distributes the heat according to the distribution principle that the high-temperature heat flow is used for high-demand scenarios, the medium-temperature heat flow is used for medium-demand, and the low-temperature heat flow is used for low-demand.

[0014] As a further scheme of the present application, the specific process of S5 is: S5.1, real-time detection of the temperature T0 of the condenser inlet temperature sensor one, and synchronous transmission of the data to the mine PLC controller; S5.2, the mine PLC controller determines the abnormal stage of the compressor according to the built-in program logic: If T0 is greater than the preset working point, open electromagnetic valve V1, electromagnetic valve V3, electromagnetic valve V4, electromagnetic valve V6, three-way electromagnetic valve a and c ports, and the rest of the electromagnetic valve is all closed, and open the standby cooling equipment. If T0 is less than or equal to the preset working point, the equipment is normally operated.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: The present application adopts three temperature section phase change units to store the condensation heat of different compressors, covering three temperature gears of 40-200 DEG C; the repeated equipment construction is reduced, a single system can meet the use of multiple compressors, and the construction cost is significantly reduced; through phase change heat storage, the constant temperature heat demand of underground can be met when the compressor is intermittently operated; meanwhile, through intelligent regulation and control, multiple working condition switching is completed, and the compressor operation condition, phase change heat storage condition and the like are detected in real time, and the abnormal working condition is quickly reacted and solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The modular phase change heat storage and recovery system principle diagram suitable for multiple types of compressors in mines.

[0017] Figure 2 The modular phase change heat storage and recovery system diagram suitable for multiple types of compressors in mines.

[0018] Figure 3 The high, medium and low temperature phase change unit structure diagram.

[0019] Figure 4 The intelligent regulation and control unit system principle diagram.

[0020] Figure 5 The intelligent regulation and control logic diagram of the compressor heat source unit and the modular phase change heat storage unit.

[0021] In the figure, 1 is a compressor heat source unit, 2 is a modular phase change heat storage unit, 3 is an intelligent regulation and control unit, and 4 is a heat energy output unit. 101 is a compressor, 102 is a throttle valve, 103 is an evaporator, 104 is a condenser, 105 is a heat pipe heat exchanger, 106 is a standby cooling equipment. 201 is a high temperature phase change unit, 202 is a medium temperature phase change unit, 203 is a low temperature phase change unit, 204 is a phase change heat exchanger, 205 is an electric heating plate, 206 is thermal insulation cotton, and 207 is a phase change material. 301. Temperature Sensor 1; 302. Temperature Sensor 2; 303. Temperature Sensor 3; 304. Temperature Sensor 4; 305. Temperature Sensor 5; 306. Three-way Solenoid Valve; 307. Solenoid Valve V1; 308. Solenoid Valve V2; 309. Solenoid Valve V3; 310. Solenoid Valve V4; 311. Solenoid Valve V5; 312. Solenoid Valve V6; 313. Classification Input Interface I; 314. Classification Output Interface I; 315. Classification Input Interface II; 316. Classification Output Interface II; 317. Solenoid Valve V7; 318. Solenoid Valve V8; 319. Solenoid Valve V9; 320. Circulation Pump I; 321. Circulation Pump II; 322. Mining PLC Controller; 401. Public supply tank; 402. Public return tank; 403. User terminal. Detailed Implementation

[0022] The present invention will be further illustrated by the following examples.

[0023] like Figures 1 to 3 As shown, the system includes a compressor heat source unit 1, a modular phase change heat storage unit 2, an intelligent control unit 3, and a heat output unit 4. The compressor heat source unit 1 connects to multiple types of compressors 101 to achieve initial collection of condensation heat; the modular phase change heat storage unit 2 stores condensation heat at different temperature levels, achieving efficient storage of latent heat through phase change materials; the intelligent control unit 3 detects and identifies the condensation heat temperature, automatically allocates it to the corresponding heat storage module, and achieves precise temperature control by adjusting the solenoid valve. The heat output unit 4 is used to deliver the heat stored in the heat storage modules to the downhole heating scenario as needed, realizing the cascade utilization of heat.

[0024] The compressor heat source unit 1 comprises a compressor 101, a throttle valve 102, an evaporator 103, a condenser 104, a heat pipe heat exchanger 105, and a standby cooling device 106. The modular phase change heat storage unit 2 comprises a high-temperature phase change unit 201, a medium-temperature phase change unit 202, and a low-temperature phase change unit 203; each phase change unit comprises a phase change heat exchanger 204, an electric heating plate 205, and thermal insulation cotton 20. The intelligent control unit 3 comprises a mine PLC controller 322, temperature sensor one 301, temperature sensor two 302, temperature sensor three 303, temperature sensor four 304, temperature sensor five 305, a three-way electromagnetic valve 306, an electromagnetic valve V1 307, an electromagnetic valve V2 308, an electromagnetic valve V3 309, an electromagnetic valve V4 310, an electromagnetic valve V5 311, an electromagnetic valve V6 312, a classification input interface I 313, a classification input interface II 314, a classification output interface I 315, a classification output interface II 316, an electromagnetic valve V7 317, an electromagnetic valve V8 318, an electromagnetic valve V9 319, a circulating pump I 320, and a circulating pump II 321. The heat energy output unit 4 comprises a public liquid supply tank 401, a public liquid return tank 402, and a user end 403.

[0025] The compressor 101, the condenser 104, the expansion valve 102, and the evaporator 103 in the compressor heat source unit 1 are connected in sequence through pipelines, and the circulating medium in the pipelines is refrigerant. The condensate generated by the compressor 101 is collected by the condenser 104 to form condensate, which flows out from the condenser 104 cold source outlet, enters a three-way branch through a pipeline, and is preliminarily distributed: the condensate in branch I flows through the electromagnetic valve V1 307 into the heat pipe heat exchanger 105 through a pipeline, completes heat exchange, and flows out from the heat pipe heat exchanger hot end 105 outlet, passes through the temperature sensor two 302, enters a branch port, one end enters the three-way electromagnetic valve 306 b port through the electromagnetic valve V5 311, and the other end enters the modular phase change heat storage unit 2 through the electromagnetic valve V4 310, completes heat storage, and enters the three-way electromagnetic valve 306 b port through the electromagnetic valve V6 312 after heat storage; the condensate in branch II flows through the electromagnetic valve V2 308 and the electromagnetic valve V4 310, enters the modular phase change heat storage unit 2, completes heat storage, and enters the three-way electromagnetic valve 306 b port through the electromagnetic valve V6 312 after heat storage; the condensate in branch III flows through the electromagnetic valve V3 309, enters the standby cooling device 106, completes cooling, and enters the three-way electromagnetic valve 306 c port; the condensate enters the circulating pump I 320 through the three-way electromagnetic valve 306 a port, enters the condenser 104 cold source inlet, completes heat exchange, enters the condensate loop from the condenser 104 cold source outlet, and completes the condensation side closed loop.

[0026] Further, the mine PLC controller 322 controls the electromagnetic valve start-stop, realizes loop switching. User end 403 needs heat conditions, the compressor 101 runs normally and the generated condensing heat is less than the user end 403 heat demand, the mine PLC controller 322 controls to open the electromagnetic valve V1307 and the electromagnetic valve V5311, the rest of the electromagnetic valve is closed; the compressor 101 runs normally and the generated condensing heat is greater than the user end 403 heat demand, the mine PLC controller 322 controls to open the electromagnetic valve V1307, V4310 and V6312, the rest of the electromagnetic valve is closed. User end 403 does not need heating, the compressor 101 runs normally, the mine PLC controller 322 controls to open the electromagnetic valve V2308, the electromagnetic valve V4310 and the electromagnetic valve V6312, the rest of the electromagnetic valve is closed. The mine PLC controller 322 receives an abnormal model, controls the electromagnetic valve V3309 and the three-way electromagnetic valve 306c port to open, and opens the standby cooling equipment 106.

[0027] The condensate high-temperature outlet in the heat pipe heat exchanger 105 flows out, passes through the temperature sensor two 302 and the electromagnetic valve V4310, enters the classification input interface I 313, is selected to enter the phase change subunit, reaches the classification output interface I 314 after completing heat exchange, and reaches the three-way electromagnetic valve 306b port through the electromagnetic valve V6312. The cold source inlet of the modular phase change heat storage unit 2 is connected with the cold source outlet of the heat pipe heat exchanger 105, the cold source outlet of the modular phase change heat storage unit 2 enters the public liquid supply tank 401 through the circulating pump II 321. The hot user return water in the heat energy output unit 4 enters the public liquid return tank 402, the heat pipe heat exchanger 105, the classification input interface II 315, the modular phase change heat storage unit 2 in turn, forms hot user supply water after completing heat exchange, enters the public liquid supply tank 401 through the connected classification output interface II 316, and supplies the hot user supply water to the user end 403.

[0028] Further, the three phase change units are connected in parallel, the high-temperature phase change unit 201 is adapted to condensing heat temperature 120-200 DEG C, is filled with phase change material 207 sodium nitrate-potassium nitrate in the inside; the medium-temperature phase change unit 202 is adapted to condensing heat temperature 60-120 DEG C, is filled with phase change material 207 paraffin-expanding graphite in the inside; the low-temperature phase change unit 203 is adapted to condensing heat temperature 40-60 DEG C, is filled with phase change material 207 capric acid-lauric acid in the inside. The phase change unit 204 is equipped with an electric heating plate 205 at the bottom, and the heating is started when the temperature of the phase change material 207 is lower than the melting point. The phase change unit is covered with heat preservation cotton 206 outside, heat loss is reduced, and the phase change heat exchanger 204 is connected inside and outside the phase change unit, heat exchange is realized.

[0029] When temperature sensor 2 detects the condensate temperature and adapts to the high-temperature phase change unit, the mining PLC controller 322 opens the high-temperature channels in category input interface I 313, category input interface II 315, category output interface I 314, and category output interface II 316; when temperature sensor 2 detects the condensate temperature and adapts to the medium-temperature phase change unit, the mining PLC controller 322 opens the medium-temperature channels in category input interface I 313, category input interface II 315, category output interface I 314, and category output interface II 316; the start and stop of the low-temperature phase change unit is similar.

[0030] The intelligent control unit 3 completes the condensation heat acquisition and distribution, phase change heat storage, cascade heat release, and abnormal handling process. The mine-use PLC controller 322 terminal receives the heat signal from the user terminal 403 and controls the start and stop of solenoid valves V1307, V2308, V4310, V5311, and V6312 to control the current operating conditions; the mine-use PLC controller 322 terminal also receives the condensate temperature T collected in real time by temperature sensor 302. i Signals control the opening status of the classification input interface I 313, classification input interface II 315, and classification output interface I 314 and classification output interface II 316, realizing the thermal distribution of the module phase change unit; the mining PLC controller 322 terminal receives temperature sensor 303, temperature sensor 404, and temperature sensor 505 to collect temperature T. pcm1 T pcm2 T pcm3 The system controls the start and stop of solenoid valve V3309, three-way solenoid valve 306, and electric heating plate 205 to achieve phase change heat storage. The mining PLC controller 322 terminal receives the heat demand from user terminal 403 and controls heat flow distribution to achieve cascaded heat release. The mining PLC controller 322 terminal receives the temperature T0 from temperature sensor 301 and controls the start and stop of backup cooling equipment 106 to achieve adjustment in abnormal conditions.

[0031] like Figure 4 and Figure 5 As shown, the modular phase change heat storage and recovery method adapted to various types of compressors in mines, based on the aforementioned modular phase change heat storage and recovery system adapted to various types of compressors in mines, includes the following steps: S1, the stage of condensing heat, heat load demand statistics and operating condition judgment; The specific process is as follows: S1.1 System initialization: Start compressor 101 and intelligent control unit 3. In the initial state, all solenoid valves are closed. S1.2 Receive the heat load demand Q from user terminal 403 (e.g., in a mining heating scenario). i And calculate the load Q that the condensing heat (heat supply end) of compressor 101 can provide. m ; S1.3, the PLC controller 322 built-in program logic determines the current operating condition: If Q i = 0, no heat demand condition, open electromagnetic valve V2308, electromagnetic valve V1310, electromagnetic valve V6312, enter the module phase change unit heat distribution stage; If Q i ≠ 0 and Q i ≤ Q m , heat demand is less than the heating stage, open electromagnetic valve V1307, electromagnetic valve V1310, electromagnetic valve V6312, enter the module phase change unit heat distribution stage; If Q i ≠ 0 and Q i > Q m , heat demand is greater than the heating stage, open electromagnetic valve V1307, electromagnetic valve V5311, enter the abnormal processing stage.

[0032] S2, module phase change unit heat distribution stage; The specific process is: S2.1, temperature sensor two 302 real-time acquisition of condensate temperature T i , data synchronization transmission to the PLC controller 322; S2.2, the PLC controller 322 built-in program logic determines the entry of the modular phase change heat storage unit 2: When T1> 120℃, open the high temperature channel of the classification input interface Ⅰ313, classification input interface Ⅱ315, classification output interface Ⅰ314, classification output interface Ⅱ316, and the condensate flows into the high temperature phase change unit 201; When 60℃≤ T1≤ 120℃, open the medium temperature channel of the classification input interface Ⅰ313, classification input interface Ⅱ315, classification output interface Ⅰ314, classification output interface Ⅱ316, and the condensate flows into the medium temperature phase change unit 202; When T1< 60℃, open the low temperature channel of the classification input interface Ⅰ313, classification input interface Ⅱ315, classification output interface Ⅰ314, classification output interface Ⅱ316, and the condensate flows into the low temperature phase change unit 203.

[0033] S3, phase change heat storage stage; The specific process is: S3.1, the condensate enters the phase change heat exchanger 204 of the corresponding phase change unit, and the heat is transferred to the phase change material 207 through the heat exchange surface, and the phase change material 207 gradually changes from solid to liquid, at this time the latent heat storage is realized; S3.2, the temperature sensor connected on each phase change unit real-time monitors the temperature T pcm1 of the phase change material 207 (T pcm2 \Tpcm3 ), the data is transmitted to the mine PLC controller 322 synchronously; S3.3, the mine PLC controller 322 judges the heat storage stage according to the built-in program logic: When the temperature of the phase change material 207 is greater than or equal to the melting point temperature, a “heat storage complete” signal is sent to the mine PLC controller 322, and it is judged whether the compressor 101 is running: If the compressor 101 continues to run, open the electromagnetic valve V3309, the three-way electromagnetic valve 306a, b, c, and close all the rest of the electromagnetic valves, and start the standby cooling equipment 106. If the compressor 101 ends running, close all the electromagnetic valves, open the electric heating plate 205, and enter the heat preservation state; detect the temperature T of the phase change material 207 pcm1 (T pcm2 \T pcm3 ), and close the electric heating plate 205 when reaching the melting point again; When the temperature T of the phase change material 207 is less than the melting point temperature pcm1 (T pcm2 \T pcm3 ), continue to heat storage.

[0034] S4, the step-by-step heat release stage; The specific process is: The mine PLC controller 322 receives the heat demand of the user end 403, and distributes the heat according to the distribution principle that high-temperature heat flow is used for high-demand scenarios, medium-temperature heat flow is used for medium-demand, and low-temperature heat flow is used for low-demand.

[0035] S5, the abnormality detection stage; The specific process is: S5.1, real-time detection of the temperature T0 of the condenser inlet temperature sensor 301, and synchronous transmission of the data to the mine PLC controller 322; S5.2, the mine PLC controller 322 judges the abnormal running stage of the compressor 101 according to the built-in program logic: If T0> preset working condition point, open the electromagnetic valve V1307, the electromagnetic valve V3309, the electromagnetic valve V4310, the electromagnetic valve V6312, and the three-way electromagnetic valve 306a, c, and close all the rest of the electromagnetic valves, and start the standby cooling equipment 106. If T0≤ preset working condition point, the equipment is running normally.

Claims

1. A modular phase change heat storage and recovery system adapted to various types of compressors in mines, characterized in that, include: The compressor heat source unit (1) is connected to multiple types of compressors (101) for the initial collection of condensing heat. Modular phase change heat storage unit (2) stores condensation heat at different temperature levels through heat storage modules; The heat output unit (4) is used to deliver the heat stored in the heat storage module to the downhole heat application scenario as needed, so as to realize the cascade utilization of heat. The intelligent control unit (3) is connected to the compressor heat source unit (1), the modular phase change heat storage unit (2), and the heat output unit (4). By detecting and identifying the condensation heat temperature from the compressor heat source unit (1), it automatically distributes the heat to the corresponding heat storage module in the modular phase change heat storage unit (2).

2. The modular phase change heat storage and recovery system adapted to various types of mine compressors according to claim 1, characterized in that, The compressor heat source unit (1) includes a compressor (101), a condenser (104), an expansion valve (102), and an evaporator (103) connected in sequence by pipes. A temperature sensor (301) is connected on the pipe between the condenser (104) and the expansion valve (102). The cold source outlet of the condenser (104) is connected to a three-way branch via a pipe. One of the three-way branches is connected to the three-way solenoid valve (306) via solenoid valve V3 (309), a backup cooling device (106), and port c of the three-way solenoid valve (306). The other branch is connected to the branch via solenoid valve V1 (307), a heat pipe heat exchanger (105), and temperature sensor (302). At the intersection, one path is connected to port b of the three-way solenoid valve (306) via solenoid valve V5 (311), and the other path is connected to the phase change heat storage unit (2) via solenoid valve V4 (310). The three paths are connected to the phase change heat storage unit (2) via solenoid valve V2 (308), solenoid valve V4 (310), and classified input interface I (313). The phase change heat storage unit (2) is connected to port b of the three-way solenoid valve (306) via classified input outlet I (314) and solenoid valve V6 (312). Port a of the three-way solenoid valve (306) is connected to the cold source inlet of the condenser (104) via circulating pump I (320). The modular phase change heat storage unit (2) includes a high temperature phase change unit (201), a medium temperature phase change unit (202), and a low temperature phase change unit (203) connected in parallel. The high temperature phase change unit (201), the medium temperature phase change unit (202), and the low temperature phase change unit (203) all include a phase change heat exchanger (204), an electric heating plate (205), and insulation cotton (206). Temperature sensor three (303), temperature sensor four (304), and temperature sensor five (305) are respectively connected to the high temperature phase change unit (201), the medium temperature phase change unit (202), and the low temperature phase change unit (203). The heat output unit (4) includes a user terminal (403). The user terminal (403) is connected to the phase change heat storage unit (2) through the solenoid valve V8 (318), the common return liquid tank (402), the solenoid valve V7 (317), the heat pipe heat exchanger (105), and the classified input interface II (315). After heat exchange, it forms the heat user supply water, which enters the user terminal (403) through another path through the classified output interface II (316), the circulation pump II (321), the common supply liquid tank (402), and the solenoid valve V9 (319) to complete the heating process. The intelligent control unit (3) includes a mining PLC controller (322) and temperature sensors 1 (301), 2 (302), 3 (303), 4 (304), 5 (305), 3-way solenoid valve (306), solenoid valve V1 (307), solenoid valve V2 (308), solenoid valve V3 (309), solenoid valve V4 (310), solenoid valve V5 (311), solenoid valve V6 (312), classification input interface I (313), classification input interface II (314), classification output interface I (314), classification output interface II (315), solenoid valve V7 (317), solenoid valve V8 (318), solenoid valve V9 (319), circulation pump I (320), and circulation pump II (321).

3. The modular phase change heat storage and recovery system adapted to various types of mine compressors according to claim 2, characterized in that, The high-temperature phase change unit (201) is adapted to a condensation temperature of 120-200℃, and its interior is filled with phase change material (207) sodium nitrate-potassium nitrate. The medium-temperature phase change unit (202) is adapted to a condensation heat temperature of 60-120℃, and its interior is filled with phase change material (207) paraffin-expanded graphite. The low-temperature phase change unit (203) is adapted to a condensation temperature of 40-60℃, and its interior is filled with phase change material (207) decanoic acid-lauric acid.

4. The modular phase change heat storage and recovery system adapted to various types of mine compressors according to claim 2 or 3, characterized in that, An electric heating plate (205) is located at the bottom of the corresponding phase change unit, and a heat insulation cotton (206) is located on the outside of the corresponding phase change unit. A phase change heat exchanger (204) is connected to the corresponding phase change unit, connecting the inside and outside of the phase change unit.

5. A modular phase change heat storage and recovery method adapted to various types of compressors in mines, characterized in that, The modular phase change heat storage and recovery system adapted to various types of mine compressors as described in claim 3 includes the following steps: S1, the stage of condensing heat, heat load demand statistics and operating condition judgment; S2, Thermal distribution stage of module phase change unit; S3, Phase change heat storage stage; S4, the stage of cascaded heat release; S5, Anomaly Detection Phase.

6. The modular phase change heat storage and recovery method for adapting to multiple types of compressors in mines according to claim 5, characterized in that, The specific process of S1 is as follows: S1.1 System initialization: Start the compressor (101) and intelligent control unit (3). In the initial state, all solenoid valves are closed. S1.2, Receive the heat load demand Q from the user terminal (403) i And calculate the load Q that the condensing heat of the compressor (101) can provide. m ; S1.3, The mining PLC controller (322) has built-in program logic to determine the current operating condition: If Q i =0, no heat demand condition, open solenoid valve V2 (308), solenoid valve V1 (310), solenoid valve V6 (312) to enter the heat distribution stage of the module phase change unit; If Q i ≠0 and Q i ≤ Q m When the heat demand is less than that during the heating phase, solenoid valves V1 (307), V1 (310), and V6 (312) are opened, and the module phase change unit heat distribution phase begins. If Q i ≠0 and Q i Q m When the heat demand exceeds the heating supply stage, solenoid valves V1 (307) and V5 (311) are opened, and the abnormal handling stage is entered.

7. The modular phase change heat storage and recovery method for adapting to multiple types of compressors in mines according to claim 6, characterized in that, The specific process of S2 is as follows: S2.1 Temperature sensor two (302) collects the condensate temperature T in real time. i The data is synchronously transmitted to the mining PLC controller (322). S2.2, The built-in program logic of the mining PLC controller (322) determines whether to enter the modular phase change heat storage unit (2): When T1>120℃, the high-temperature channels of Classification Input Interface I (313), Classification Input Interface II (315), Classification Output Interface I (314), and Classification Output Interface II (316) are opened, and the condensate flows into the high-temperature phase change unit (201). When 60℃≤ T1≤ 120℃, open the medium-temperature channels of Classification Input Interface Ⅰ (313), Classification Input Interface Ⅱ (315), Classification Output Interface Ⅰ (314), and Classification Output Interface Ⅱ (316), and the condensate flows into the medium-temperature phase change unit (202). When T1 < 60℃, open the low-temperature channels of Classification Input Interface I (313), Classification Input Interface II (315), Classification Output Interface I (314), and Classification Output Interface II (316), and the condensate flows into the low-temperature phase change unit (203).

8. The modular phase change heat storage and recovery method for adapting to multiple types of compressors in mines according to claim 7, characterized in that, The specific process of S3 is as follows: S3.1 The condensate enters the phase change heat exchanger (204) of the corresponding phase change unit and transfers heat to the phase change material (207) through the heat exchange surface. The phase change material (207) gradually changes from solid to liquid, and latent heat storage is realized at this time. S3.2 The temperature sensor connected to each phase change unit monitors the temperature of the phase change material (207) in real time, and the data is synchronously transmitted to the mining PLC controller (322). S3.3, The mining PLC controller (322) determines the heat storage stage based on its built-in program logic: When the temperature of the phase change material (207) is greater than or equal to its melting point, a "heat storage complete" signal is sent to the mining PLC controller (322), and it is determined whether the compressor (101) is running. If the compressor (101) is running continuously, open solenoid valve V3 (309), three-way solenoid valve (306) a, b, c ports, close all other solenoid valves, and turn on the standby cooling device (106). If the compressor (101) stops running, close all solenoid valves, open the electric heating plate (205), and enter the heat preservation state; detect the temperature of the phase change material (207), and close the electric heating plate (205) when it reaches the melting point again. When the temperature of the phase change material (207) is less than the melting point temperature, heat storage continues.

9. The modular phase change heat storage and recovery method for adapting to multiple types of compressors in mines according to claim 8, characterized in that, The specific process of S4 is as follows: The mining PLC controller (322) receives the heat demand from the user terminal (403) and distributes the heat according to the principle of using high-temperature heat flow for high-demand scenarios, medium-temperature heat flow for medium-demand scenarios, and low-temperature heat flow for low-demand scenarios.

10. The modular phase change heat storage and recovery method for adapting to multiple types of compressors in mines according to claim 9, characterized in that, The specific process of S5 is as follows: S5.1 Real-time detection of the temperature T0 of the condenser inlet temperature sensor (301), and synchronous transmission of the data to the mining PLC controller (322). S5.2, The mining PLC controller (322) determines the abnormal operation stage of the compressor (101) based on the built-in program logic: If T0 > preset operating point, open solenoid valve V1 (307), solenoid valve V3 (309), solenoid valve V4 (310), solenoid valve V6 (312), three-way solenoid valve (306) a and c ports, close all other solenoid valves, and turn on the standby cooling equipment (106). If T0 ≤ preset operating point, the equipment will operate normally.

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