Freezing liquid conveying system, control method, controller and storage medium

Abstract

The invention provides a freezing liquid conveying system, a control method, a controller and a storage medium, and relates to the technical field of refrigeration and freezing control. The system comprises a controller, and a freezing liquid storage device, an outgoing path pump machine, an outgoing path pipeline, a first control valve, a working area pipeline, a second control valve, a loop pump machine, a loop pipeline and a freezer which are connected in sequence, the outlet pipeline is used for conveying the freezing liquid in the freezing liquid storage device to the working area pipeline under the driving of the outlet pump; the loop pipeline is used for conveying the freezing liquid in the working area pipeline to the freezer under the driving of the loop pump machine; the freezer is used for cooling the freezing liquid and storing the freezing liquid in the freezing liquid storage device; and the controller is used for controlling the first control valve and the outlet pump to be started and controlling the second control valve to be closed in the freezing cooling mode, so that new freezing liquid in the freezing liquid storage device is conveyed into the working area pipeline and stays in the working area pipeline. The cold energy utilization efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration and freezing control, and particularly relates to a freezing liquid delivery system and a control method, a controller and a storage medium. BACKGROUND

[0002] Artificial freezing method is one of the commonly used reinforcement methods in current municipal and mine project construction. In the fields of freezing engineering, geothermal development and soil freezing, freezing pipes are widely used for cooling or freezing specific areas. The core of such methods is the continuous delivery of low-temperature refrigerant.

[0003] However, the traditional freezing pipe system has a serious problem of heat loss during delivery, especially during the delivery of freezing liquid from non-working areas to working areas, resulting in low overall energy efficiency. SUMMARY

[0004] The embodiments of the present application provide a freezing liquid delivery system and a control method, a controller and a storage medium to solve the problems of excessive freezing liquid heat loss and low utilization efficiency.

[0005] In a first aspect, the embodiments of the present application provide a freezing liquid delivery system, comprising a controller, a freezing liquid storage device, a go-way pump, a go-way pipeline, a first control valve, a working area pipeline, a second control valve, a return pipeline and a freezer connected in sequence, the controller being connected with the go-way pump, the first control valve, the return pump and the second control valve respectively; The go-way pipeline is used to deliver the freezing liquid in the freezing liquid storage device to the working area pipeline under the drive of the go-way pump; The return pipeline is used to deliver the freezing liquid in the working area pipeline to the freezer under the drive of the return pump; The freezer is used to cool the freezing liquid and store it in the freezing liquid storage device; The controller is used to control the first control valve and the go-way pump to be opened and the second control valve to be closed in the freezing cooling mode, so as to deliver the new freezing liquid in the freezing liquid storage device to the working area pipeline and make it stay in the working area pipeline.

[0006] In a possible implementation, the controller is further used to determine that the freezing liquid in the working area pipeline has fully acted when the difference between the ambient temperature outside the working area pipeline and the freezing liquid temperature in the working area pipeline is less than a preset threshold, and to open the return pump and the second control valve to push the freezing liquid in the working area pipeline into the return pipeline.

[0007] In a possible implementation, the controller is further configured to, in the freezing balance mode, control the first control valve, the go-way pump, the second control valve and the loop pump to be turned on, so that the freezing liquid circulates in the go-way pipeline, the working area pipeline and the loop pipeline.

[0008] In a possible implementation, the system further comprises a flow sensor, a temperature sensor and a heat flux meter, which are connected to the controller respectively; The controller is specifically configured to, in the freezing balance mode, monitor the freezing liquid flow, the freezing liquid temperature and the heat flux in the working area pipeline in real time through the flow sensor, the temperature sensor and the heat flux meter, and optimize the pushing frequency and the pushing amount of the go-way pump and the loop pump based on the freezing liquid flow, the freezing liquid temperature and the heat flux.

[0009] In a possible implementation, the go-way pipeline and the loop pipeline are provided with an insulation layer; the insulation layer comprises, from the inside to the outside, an inner aerogel coating layer, a middle polyethylene insulation layer, an outer aerogel coating layer and an outermost hard insulation shell made of PVC or UPVC material; and the aerogel coating layers are reinforced by glass fiber mesh.

[0010] In a possible implementation, the system further comprises a heat flux meter and / or a thermal conductivity meter connected to the controller; The controller is further configured to determine the thermal conductivity of the insulation layer through the heat flux meter and / or the thermal conductivity meter, and if the thermal conductivity is higher than a preset thermal conductivity threshold, the difference between the thermal conductivity and the thermal conductivity threshold increases the flow rate of the freezing liquid delivered by the go-way pump and / or reduces the initial temperature of the freezing liquid.

[0011] In a possible implementation, the controller is further configured to calculate the cold loss amount in the process of delivering the freezing liquid based on a cold loss calculation formula; wherein the cold loss calculation formula is:

[0012] wherein, is the cold loss amount, is the outer surface area of the pipeline, is an environmental influence coefficient, is a freezing liquid temperature revision coefficient, is a standard cold loss amount.

[0013] In a second aspect, an embodiment of the present application provides a control method of a freezing liquid delivery system, which is applied to a controller in the freezing liquid delivery system as described in the first aspect or any possible implementation of the first aspect; the method comprises: In the freezing cooling mode, the first control valve and the go-way pump are controlled to be turned on, and the second control valve is controlled to be turned off, so that the new freezing liquid in the freezing liquid storage device is delivered into the working area pipeline and stays in the working area pipeline.

[0014] In a third aspect, an embodiment of the present application provides a controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to the second aspect or any possible implementation of the second aspect when executing the computer program.

[0015] In a fourth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program, wherein the computer program is executable by a processor to implement the steps of the method according to the second aspect or any possible implementation of the second aspect.

[0016] The embodiment of the present application provides a frozen liquid conveying system and a control method, a controller and a storage medium, the pipeline in the frozen liquid conveying system is divided into three parts by the first control valve and the second control valve, which are the outlet pipeline, the working area pipeline and the return pipeline, when it is needed to quickly cool and freeze the working face, the first control valve and the outlet pump are opened, the frozen liquid can be pushed into the working area pipeline to perform cold energy transmission between the frozen liquid and the working face, and the second control valve is closed to prevent the frozen liquid from flowing from the working area pipeline to the return pipeline, so that unnecessary cold energy loss is avoided due to the frozen liquid staying in the non-working area. The present application can improve the utilization efficiency of cold energy and reduce the loss of cold energy. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic diagram of a frozen liquid conveying system provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a thermal insulation layer provided by an embodiment of the present application; Figure 3 is a structural schematic diagram of a frozen liquid conveying system provided by another embodiment of the present application; Figure 4 is a structural schematic diagram of a tunnel working face thermal insulation scheme provided by an embodiment of the present application; Figure 5 is an implementation flowchart of a control method of a frozen liquid conveying system provided by an embodiment of the present application; Figure 6 is a schematic diagram of a controller provided by an embodiment of the present application. DETAILED DESCRIPTION

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0021] In fields such as refrigeration engineering, geothermal development, and soil freezing, freezing pipes are widely used to cool or freeze specific areas. However, traditional freezing pipe systems suffer from significant heat loss during transport, especially in non-working areas, leading to reduced overall energy efficiency and increased energy consumption. Existing technologies primarily aim to reduce heat loss by optimizing insulation materials, but the effectiveness is limited and the cost is high.

[0022] To address the aforementioned problems, this invention provides a cryogenic fluid delivery system. By deploying pulse-type checkpoints in the outbound loop and combining them with intelligent control, the system achieves efficient circulation and precise distribution of cryogenic fluid, significantly reducing the loss of cold energy during delivery and improving energy efficiency.

[0023] See Figure 1 The diagram shows a schematic representation of the freezing fluid delivery system provided in an embodiment of the present invention, which is described in detail below: The freezing fluid delivery system includes a controller 10, a freezing fluid storage device 11, a destination pump 12, a destination pipeline 13, a first control valve 14, a working area pipeline 15, a second control valve 16, a return pump 17, a return pipeline 18, and a freezer 19 connected in sequence. The controller 10 is connected to the destination pump 12, the first control valve 14, the return pump 17, and the second control valve 16 respectively. The outgoing pipeline 13 is used to transport the frozen liquid in the frozen liquid storage device 11 to the working area pipeline 15 under the drive of the outgoing pump 12; The loop pipe 18 is used to transport the freezing fluid in the working area pipe 15 to the freezer 19 under the drive of the loop pump 17; The freezer 19 is used to cool the freezing fluid and stores it in the freezing fluid storage device 11; The controller 10 is used to control the opening of the first control valve 14 and the outgoing pump 12 and to control the closing of the second control valve 16 in the freezing and cooling mode, so as to deliver new freezing liquid in the freezing liquid storage device 11 to the working area pipeline 15 and let it stay in the working area pipeline 15.

[0024] In this embodiment, the freezing fluid delivery system operates in two modes: freezing and cooling mode and freezing equilibrium mode. In the initial stage of the freezing project, rapid cooling of the working surface is required. This necessitates the multiple delivery of a large amount of freezing fluid into the working area pipeline 15 to provide sufficient cooling for the working surface, thereby quickly freezing all objects in the construction area.

[0025] Once the object to be frozen is completely frozen, it can enter the freeze balance mode, which only needs to keep the object frozen. The required cooling capacity is small, and a small amount of high-temperature freezing liquid can be supplied to the working area pipe 15.

[0026] In the freezing and cooling mode, the control method provided in this embodiment can ensure that the freezing liquid is accurately stationed in the working area pipe 15, so as to provide as much cooling energy as possible to the object to be frozen, and avoid the freezing liquid from staying in the outgoing pipe 13 and the return pipe 18 and losing cooling energy, thereby improving the utilization efficiency of cooling energy.

[0027] In this embodiment of the invention, the piping in the freezing fluid delivery system is divided into three parts using a first control valve and a second control valve: a destination pipe, a working area pipe, and a return pipe. When rapid cooling and freezing of the working surface is required, the first control valve and the destination pump are opened to push the freezing fluid into the working area pipe, facilitating the transfer of cold energy between the freezing fluid and the working surface. Simultaneously, the second control valve is closed to prevent the freezing fluid from flowing from the working area pipe into the return pipe, avoiding the freezing fluid from lingering in non-working areas and causing unnecessary cold energy loss. This invention can improve the utilization efficiency of cold energy and reduce cold energy loss.

[0028] In one possible implementation, the controller 10 is further configured to determine that the freezing fluid in the working area pipeline 15 has been fully utilized when the difference between the ambient temperature outside the working area pipeline 15 and the freezing fluid temperature inside the working area pipeline 15 is less than a preset threshold, and to activate the loop pump 17 and the second control valve 16 to push the freezing fluid in the working area pipeline 15 into the loop pipeline 18.

[0029] In this embodiment, the preset threshold can be set according to the actual situation. A temperature sensor can be placed at the location of the object to be frozen that is in contact with the outer surface of the working area pipe 15. If, after a certain amount of freezing liquid is delivered to the working area pipe 15, the temperature measured by the temperature sensor is the same as the temperature of the freezing liquid after a certain period of time, it indicates that it is difficult to quickly form a temperature difference for cold transfer. At this time, it is necessary to first transport the existing freezing liquid in the working area back to the freezer 19 through the loop pipe 18, and then transport new freezing liquid to the working area pipe 15.

[0030] During this operation, the first control valve 14 can be closed, and the loop pump 17 and the second control valve 16 can be turned on to output all the freezing fluid in the working area pipeline 15 and prevent the freezing fluid in the destination pipeline 13 from being transported to the loop pipeline 18 through the working area pipeline 15.

[0031] In one possible implementation, the controller 10 is also used to control the opening of the first control valve 14, the outgoing pump 12, the second control valve 16 and the return pump 17 in the freeze balance mode, so that the freeze fluid circulates in the outgoing pipeline 13, the working area pipeline 15 and the return pipeline 18.

[0032] In this embodiment, under freeze-balance mode, the refrigeration temperature only needs to be reached to maintain the current balance. In this state, the first control valve 14, the outgoing pump 12, the second control valve 16, and the return pump 17 can be opened, using appropriate flow rates and freezing liquid temperatures to maintain a stable temperature in the working area.

[0033] In one possible implementation, a flow sensor, a temperature sensor, and a heat flux meter are also included, each connected to the controller 10. The controller 10 is specifically used to monitor the flow rate, temperature and heat flux of the freezing fluid in the working area pipeline 15 in real time through a flow sensor, a temperature sensor and a heat flux meter in the freeze balance mode, and to optimize the pushing frequency and pushing amount of the outgoing pump 12 and the return pump 17 based on the flow rate, temperature and heat flux of the freezing fluid.

[0034] In this embodiment, heat flux density is the heat energy passing through a unit area per unit time. Integrating the heat flux density yields the heat flux. By monitoring the flow rate, temperature, and heat flux of the freezing fluid in the working area pipe 15, the heat exchange between the freezing fluid and the surrounding objects to be frozen can be determined. This allows for the determination of the required cooling capacity and freezing fluid temperature in the working area under the freezing equilibrium mode, thereby reducing losses.

[0035] In addition, in the freezing and cooling mode, monitoring the heat flux density of the working area can also reveal the efficiency and rate of freezing objects, clarify the provided cooling capacity, the cooling capacity used by the objects to be cooled, and the cooling capacity lost during transportation, thereby determining the pushing frequency and pushing amount with the least waste of cooling capacity.

[0036] Specifically, the relationship between the wasted cooling capacity during transmission and the push frequency, push flow rate, and push quantity can be calculated. The magnitude of the impact factors on the frequency, flow rate, initial refrigerant temperature, and efficiency of the refrigerant when it reaches the working area can also be calculated. At the same time, the optimization can be carried out in combination with the on-site requirements for freezing time to determine the push frequency and push quantity that minimize the waste of cooling capacity.

[0037] In one possible implementation, the outgoing pipeline 13 and the returning pipeline 18 are covered with an insulation layer; the insulation layer includes, from the inside out, an inner aerogel coating layer, a middle polyethylene insulation layer, an outer aerogel coating layer, and an outermost rigid insulation shell made of PVC or UPVC material; wherein each aerogel coating layer is reinforced with fiberglass mesh.

[0038] In this embodiment, artificial freezing is one of the commonly used reinforcement methods in municipal and mining projects. The core of this method is the continuous supply of low-temperature refrigerant. Reducing cold loss and improving the insulation effect of pipelines and working surfaces during continuous refrigerant supply is a crucial factor affecting project costs and construction safety. Traditional construction typically uses a single insulation board to insulate pipelines, frozen working surfaces, and the ends of the freezer, supplemented by a small amount of tape. However, this insulation method is difficult to achieve a tight fit with irregularly shaped structures, causing heat to easily escape from gaps. Furthermore, the insulation material is prone to water immersion in low-temperature, high-humidity environments for extended periods, affecting its insulation performance and potentially damaging the pipeline. Therefore, it is essential to find a specialized insulation material with better service performance, stronger insulation properties, and better adhesion.

[0039] To effectively fit the pipes and working surfaces, the total insulation layer thickness is set to 5cm in this embodiment. The entire insulation layer consists of four parts, and its structure is as follows: Figure 2 As shown, from the inside out, the layers consist of the pipe, a 1cm thick aerogel insulation coating, a 3cm thick polyethylene insulation layer, an outer 1cm thick aerogel insulation coating (with fiberglass mesh used for reinforcement), and an outermost rigid insulation shell made of PVC or UPVC. The outermost rigid insulation shell of PVC or UPVC is only for use in cold-transmission pipes.

[0040] For the working surface or the outside of the freezer 19, the outermost layer needs to be replaced with butyl waterproof tape for sealing. Simultaneously, heat flux meters can be installed on the outside of the insulation layer and at the working position of the freezing pipe to control the flow rate according to the required heat flow, achieving automated control.

[0041] This insulation layer structure reduces the amount of cold dissipation from the freezing pipe in non-working areas, improves the efficiency of cold energy utilization in the intelligent pulse-type circulating conveying system, and effectively enhances the insulation efficiency of the pipeline, preventing the insulation materials of the cold conveying pipeline and working surface from degrading during long-term service.

[0042] In one possible implementation, a heat flux density meter and / or thermal conductivity meter connected to the controller 10 are also included; The controller 10 is also used to determine the thermal conductivity of the insulation layer by means of a heat flux density meter and / or a thermal conductivity meter. If the thermal conductivity is higher than a preset thermal conductivity threshold, the difference between the thermal conductivity and the thermal conductivity threshold increases the flow rate of the freezing liquid delivered by the down-path pump 12 and / or reduces the initial temperature of the freezing liquid.

[0043] In this embodiment, when the thermal conductivity is higher than the preset thermal conductivity threshold, it indicates that the amount of cold loss of the freezing fluid during the process of being transported from the outgoing pipeline 13 to the working area pipeline 15 will be higher than the estimated amount of cold loss. It is necessary to increase the flow rate of the freezing fluid and reduce the transportation time to reduce the actual amount of cold loss, or to lower the initial temperature of the freezing fluid so that the temperature of the freezing fluid transported to the working area pipeline 15 still meets the freezing requirements.

[0044] Specifically, it can be set that for every 0.05 W / (m·K) increase in thermal conductivity threshold, the flow rate of the freezing fluid increases by 0.05 m / s and / or the initial temperature of the freezing fluid decreases by 0.05 °C. The adjustment amount of the freezing fluid flow rate and the initial temperature of the freezing fluid can also be set according to the actual situation.

[0045] In one possible implementation, the controller 10 is further configured to calculate the amount of cold loss during the delivery of the freezing liquid based on a cold loss calculation formula; wherein the cold loss calculation formula is:

[0046] in, This refers to the amount of cold energy lost. This refers to the outer surface area of ​​the pipe. This is the environmental impact factor. This is the correction factor for the freezing fluid temperature. This is the standard amount of cold energy loss.

[0047] In this embodiment, the outer surface area of ​​the pipe is measured in square meters (m²). Environmental impact factor. The value depends on the ambient temperature. Taking tunnel construction as an example, when the ambient temperature of the tunnel is between 10℃ and 25℃, the environmental impact coefficient... The value ranges from 0.9 to 1.0; when the tunnel ambient temperature is 5℃-10℃, The value is 0.8-0.9; when the tunnel ambient temperature is 0℃-5℃, The value is 0.6-0.8; when the tunnel ambient temperature is below 0℃, The value is 0.5.

[0048] Freezing fluid temperature revision factor The value depends on the temperature of the freezing fluid, as the rate of cold loss varies at different temperatures. For example, the freezing fluid temperature revision factor can be set to 0.6 when the freezing fluid temperature is above -15°C and 1.0 when the freezing fluid temperature is below -15°C.

[0049] q is the standard cold loss, which is 22 W / ㎡-25 W / ㎡. The specific value depends on the tightness of the insulation shell and the application of the insulation material.

[0050] The formula provided in this embodiment can be used to calculate the amount of cold loss under different freezing fluid transportation conditions, thereby evaluating and comparing the economy and freezing fluid utilization efficiency under different conditions.

[0051] In one specific embodiment, the structure of the freezing fluid delivery system is as follows: Figure 3 As shown, the details are as follows: ①System Composition: The system of this invention mainly includes a freezing liquid storage device, a return loop pipeline, a pulse-type gate controller, a flow sensor, a temperature sensor and controller, an intelligent control unit, and a device for delineating the working area and non-working area. In some cases, the functions of the controller and the intelligent control unit can be achieved through a single controller.

[0052] ② Pulse-type gate design: Pulse-type gates are installed on the return pipeline, especially on the route from the non-working area to the working area. These gates consist of solenoid valves or hydraulic control valves, which can quickly open or close according to the instructions of the intelligent control unit to achieve pulse-type delivery of the freezing fluid.

[0053] ③ Intelligent control strategy: a. Monitor the utilization of freezing fluid in the work area and provide real-time feedback to the intelligent control unit via sensors.

[0054] b. When the freezing fluid in the working area is insufficient, the intelligent control unit controls the opening of the outgoing route gate and simultaneously closes the return gate, so that the freezing fluid in the non-working area is quickly pushed to the working area in the form of pulses for full utilization, reducing energy loss during the transmission process and increasing energy utilization in the working area.

[0055] c. Checkpoints are set up on both sides of the working area to ensure that the freezing liquid is fully utilized in the working area before being pushed back into the loop, thereby reducing the loss of cold energy in the loop.

[0056] d. Optimize the frequency and quantity of push notifications to maximize the utilization of cold storage.

[0057] ④ Thermal insulation material assistance: In addition to pulse-type shut-off control, high-performance thermal insulation materials are used to fully cover the pipeline, and thermal insulation layers are added at key nodes to further reduce heat loss.

[0058] Based on the above, this embodiment integrates the intelligent pulse-type circulating delivery system with the composite insulation scheme to ensure their coordinated operation. Through intelligent control and monitoring technology, the frequency, quantity, and flow rate of the freezing liquid are precisely adjusted based on environmental parameters such as the temperature, humidity, and air circulation of the insulation layer. Simultaneously, high-efficiency insulation materials are used to reduce energy loss, achieving energy-saving goals. The following is a detailed explanation of the system's combined mechanism: ① Intelligent monitoring and control: By utilizing flow sensors, temperature sensors, and controllers in an intelligent pulse-type circulating delivery system, parameters such as the flow rate and temperature of the freezing fluid in the pipeline are monitored in real time. These parameters are then fed back to the intelligent control unit to optimize the delivery frequency and quantity, thereby maximizing the utilization of the cooling capacity.

[0059] ② Dynamic adjustment of insulation layer parameters: The thermal conductivity and heat flux of the insulation material are monitored in real time using a heat flux density meter and a thermal conductivity meter. Over time, the material's performance degrades. To address this, the intelligent control unit dynamically adjusts the frequency or flow rate of cooling supply whenever the monitoring system's data increases by a fixed value, adapting to different working environments and energy efficiency requirements. For example, if the thermal conductivity of the insulation layer exceeds a threshold of 0.05 W / (m·K), the flow rate of the freezing liquid increases by 0.05 m / s, or the initial temperature of the freezing liquid decreases, or both are adjusted. An algorithm selects the most environmentally friendly and energy-efficient adjustment method and sets thresholds for the thermal conductivity of the insulation layer at each stage of the freezing cooling mode and freezing equilibrium mode based on actual conditions. Whenever the thermal conductivity exceeds twice the threshold, the corresponding values ​​of the freezing liquid flow rate and / or initial temperature are adjusted.

[0060] ③ Applications of heat flux density meters: Heat flux meters are installed on the outside of the insulation layer and at the working position of the freezing pipe to monitor heat flow in real time. Based on the readings of the heat flux meters, the intelligent control unit can adjust the operating parameters of the conveying system, such as the pushing frequency and flow rate, to achieve precise control of heat flow.

[0061] The composite insulation solution provided in this embodiment is implemented according to the following steps: Step 1: Clean the surface of the pipes after installation to avoid rust and other residues.

[0062] Step 2: Apply the inner layer of aerogel coating using a special mold, controlling the coating thickness to about 1cm, and let it stand for 24 hours.

[0063] Step 3: After the inner aerogel coating has solidified, cover it with a 3cm polyethylene insulation layer, and fix the insulation layer with glue along the material cut.

[0064] Step 4: Continue to apply an outer layer of aerogel coating to the outside of the polyethylene material using a special mold, keeping the coating thickness to about 1 cm.

[0065] Step 5: Immediately after the outer aerogel is applied, install the PVC or UPVC shell to ensure it fits tightly to the applied aerogel material. Secure it to the outside with fixing clamps to ensure its dimensions. The fixing clamps can be removed after the outer aerogel has solidified, and the product can be used normally.

[0066] Considering that the above steps for applying each layer of insulation material are cumbersome and time-consuming, we propose to invent an integrated roll material that combines the above materials, which can be directly installed on the pipe surface during construction, making it convenient to operate and use.

[0067] For the insulation layer structure of the tunnel working face, such as Figure 4 As shown, the implementation steps omit step 1 above, and replace the outermost PVC or UPVC rigid insulation shell in step 5 with butyl waterproof tape for sealing. The remaining steps are the same as above.

[0068] The heat flux data of the insulation layer structure provided in this embodiment and traditional insulation materials were experimentally compared, and the data are shown in Table 1: Table 1

[0069] Taking a typical connecting passage as an example, the cooling capacity savings after adopting the new composite insulation scheme are calculated. In the case, two 6-inch (DN150) liquid supply pipes are set up, strictly following the principle of one-way flow. Four different cooling supply scenarios are calculated according to the following formula, and the specific operating conditions and calculation results are summarized in Table 2.

[0070]

[0071] To save cooling capacity, kW; The initial heat flux is kW / ; The initial heat flux is kW / ; The outer surface area of ​​the pipe. ; For calculating time, h.

[0072] Table 2

[0073] As can be seen from the above, the freezing fluid delivery system provided by the present invention has the following beneficial effects: 1. Reduced cold loss: Through precise pulse-type gate control, the residence time of the freezing fluid in the non-working area is effectively shortened, significantly reducing the loss of cold during transportation.

[0074] 2. Improve freezing efficiency: Ensure that the work area always has sufficient freezing capacity to improve overall freezing efficiency.

[0075] 3. Reduced energy consumption: Reduces additional energy consumption caused by heat loss, thus lowering operating costs.

[0076] 4. Intelligent Management: Integrated intelligent control system enables remote monitoring and automatic adjustment, improving ease of operation and system stability. 5. The system has a simple structure, is easy to implement and maintain, and has high value for promotion and application.

[0077] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0078] The following are method embodiments of the present invention. For details not described in detail, please refer to the corresponding system embodiments described above.

[0079] Figure 5 A flowchart illustrating the implementation of the control method for the freezing fluid delivery system provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiments of the present invention are shown, and are described in detail below: like Figure 5 As shown, a control method for a cryogenic fluid delivery system is applied to a controller in the cryogenic fluid delivery system as described in the first aspect or any possible implementation thereof; the method includes: Step 501: In the freezing and cooling mode, control the first control valve and the outgoing pump to open, and control the second control valve to close, so as to deliver new freezing liquid from the freezing liquid storage device to the working area pipeline and stay in the working area pipeline.

[0080] One possible implementation also includes: When the difference between the ambient temperature outside the working area pipeline and the temperature of the freezing fluid inside the working area pipeline is less than a preset threshold, it is determined that the freezing fluid inside the working area pipeline has been fully utilized, and the loop pump and the second control valve are activated to push the freezing fluid inside the working area pipeline into the loop pipeline.

[0081] One possible implementation also includes: In freeze balance mode, the first control valve, the outgoing pump, the second control valve, and the return pump are opened to allow the freeze fluid to circulate in the outgoing pipeline, the working area pipeline, and the return pipeline.

[0082] In one possible implementation, the system also includes a flow sensor, a temperature sensor, and a heat flux meter, which are respectively connected to the controller; In freeze balance mode, the control valves for the first control valve, the outgoing pump, the second control valve, and the return pump are activated, including: In freeze balance mode, the flow rate, temperature and heat flux of the freezing fluid in the working area pipeline are monitored in real time by flow sensor, temperature sensor and heat flux meter, and the push frequency and push volume of the outgoing pump and return pump are optimized based on the flow rate, temperature and heat flux of the freezing fluid.

[0083] In one possible implementation, the outgoing and returning pipes are covered with insulation layers; the insulation layers, from the inside out, include an inner aerogel coating layer, a middle polyethylene insulation layer, an outer aerogel coating layer, and an outermost rigid insulation shell made of PVC or UPVC material; wherein each aerogel coating layer is reinforced with fiberglass mesh.

[0084] In one possible implementation, the system also includes a heat flux density meter and / or a thermal conductivity meter connected to the controller; The method also includes: The thermal conductivity of the insulation layer is determined by a heat flux density meter and / or a thermal conductivity meter. If the thermal conductivity is higher than a preset thermal conductivity threshold, the difference between the thermal conductivity and the thermal conductivity threshold is increased to increase the flow rate of the freezing fluid delivered by the downstream pump and / or decrease the initial temperature of the freezing fluid.

[0085] In one possible implementation, the method further includes: The amount of cold loss during the transportation of freezing liquid is calculated based on the cold loss calculation formula; whereby the cold loss calculation formula is:

[0086] in, This refers to the amount of cold energy lost. This refers to the outer surface area of ​​the pipe. This is the environmental impact factor. This is the correction factor for the freezing fluid temperature. This is the standard amount of cold energy loss.

[0087] In this embodiment of the invention, the piping in the freezing fluid delivery system is divided into three parts using a first control valve and a second control valve: a destination pipe, a working area pipe, and a return pipe. When rapid cooling and freezing of the working surface is required, the first control valve and the destination pump are opened to push the freezing fluid into the working area pipe, facilitating the transfer of cold energy between the freezing fluid and the working surface. Simultaneously, the second control valve is closed to prevent the freezing fluid from flowing from the working area pipe into the return pipe, avoiding the freezing fluid from lingering in non-working areas and causing unnecessary cold energy loss. This invention can improve the utilization efficiency of cold energy and reduce cold energy loss.

[0088] Figure 6 This is a schematic diagram of the controller provided in an embodiment of the present invention. Figure 6 As shown, the controller 6 in this embodiment includes a processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the processor 60. When the processor 60 executes the computer program 62, it implements the steps in the control method embodiments of the various freezing fluid delivery systems described above, for example... Figure 5 Step 501 is shown.

[0089] For example, the computer program 62 can be divided into one or more modules / units, which are stored in the memory 61 and executed by the processor 60 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 62 in the controller 6.

[0090] The controller 6 can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The controller 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will understand that... Figure 6 This is merely an example of controller 6 and does not constitute a limitation on controller 6. It may include more or fewer components than shown, or combine certain components, or different components. For example, the controller may also include input / output devices, network access devices, buses, etc.

[0091] The processor 60 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0092] The memory 61 can be an internal storage unit of the controller 6, such as a hard disk or memory of the controller 6. The memory 61 can also be an external storage device of the controller 6, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the controller 6. Furthermore, the memory 61 can include both internal storage units and external storage devices of the controller 6. The memory 61 is used to store the computer program and other programs and data required by the controller. The memory 61 can also be used to temporarily store data that has been output or will be output.

[0093] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0095] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0096] In the embodiments provided by this invention, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0097] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0098] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0099] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the control method embodiments of the various freezing fluid delivery systems described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0100] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A freezing fluid delivery system, characterized in that, The device includes a controller, a freezing liquid storage device, a destination pump, a destination pipeline, a first control valve, a working area pipeline, a second control valve, a return pump, a return pipeline, and a freezer, all connected in sequence. The controller is connected to the destination pump, the first control valve, the return pump, and the second control valve, respectively. The outgoing pipeline is used to transport the frozen liquid in the frozen liquid storage device to the working area pipeline under the drive of the outgoing pump. The loop pipeline is used to transport the freezing fluid in the working area pipeline to the freezer under the drive of the loop pump. The freezer is used to cool the freezing liquid and stores it in the freezing liquid storage device; The controller is used to control the opening of the first control valve and the outgoing pump in the freezing and cooling mode, and to control the closing of the second control valve, so as to deliver new freezing liquid from the freezing liquid storage device to the working area pipeline and let it stay in the working area pipeline.

2. The freezing fluid delivery system according to claim 1, characterized in that, The controller is further configured to determine that the freezing liquid in the working area pipeline has been fully utilized when the difference between the ambient temperature outside the working area pipeline and the freezing liquid temperature inside the working area pipeline is less than a preset threshold, and to activate the loop pump and the second control valve to push the freezing liquid in the working area pipeline into the loop pipeline.

3. The freezing fluid delivery system according to claim 1, characterized in that, The controller is also used to control the opening of the first control valve, the outgoing pump, the second control valve, and the return pump in the freeze balance mode, so that the freeze liquid circulates in the outgoing pipeline, the working area pipeline, and the return pipeline.

4. The freezing fluid delivery system according to claim 3, characterized in that, It also includes a flow sensor, a temperature sensor, and a heat flux meter, which are respectively connected to the controller; Specifically, the controller is used to monitor the flow rate, temperature, and heat flux of the freezing fluid in the working area pipeline in real time through the flow sensor, the temperature sensor, and the heat flux meter in the freeze balance mode, and to optimize the pushing frequency and pushing amount of the outgoing pump and the returning pump based on the freezing fluid flow rate, freezing fluid temperature, and heat flux.

5. The freezing fluid delivery system according to claim 1, characterized in that, The outgoing pipeline and the returning pipeline are covered with an insulation layer; the insulation layer consists of an inner aerogel coating layer, a middle polyethylene insulation layer, an outer aerogel coating layer, and an outermost rigid insulation shell made of PVC or UPVC material, from the inside out; wherein each aerogel coating layer is reinforced with fiberglass mesh.

6. The freezing fluid delivery system according to claim 5, characterized in that, It also includes a heat flux density meter and / or a thermal conductivity meter connected to the controller; The controller is further configured to determine the thermal conductivity of the insulation layer by means of the heat flux density meter and / or the thermal conductivity meter. If the thermal conductivity is higher than a preset thermal conductivity threshold, the difference between the thermal conductivity and the thermal conductivity threshold is used to increase the flow rate of the frozen liquid delivered by the outgoing pump and / or reduce the initial temperature of the frozen liquid.

7. The freezing fluid delivery system according to claim 6, characterized in that, The controller is further configured to calculate the amount of cold loss during the delivery of the freezing liquid based on a cold loss calculation formula; wherein the cold loss calculation formula is: in, This refers to the amount of cold energy lost. This refers to the outer surface area of ​​the pipe. This is the environmental impact factor. This is the correction factor for the freezing fluid temperature. This is the standard amount of cold energy loss.

8. A control method for a freezing fluid delivery system, characterized in that, A controller applied to a freezing fluid delivery system as described in any one of claims 1 to 7; the method comprising: In the freezing and cooling mode, the first control valve and the outgoing pump are opened, and the second control valve is closed, so as to deliver new freezing liquid from the freezing liquid storage device to the working area pipeline and stay in the working area pipeline.

9. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in claim 8 above.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in claim 8 above.

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