Waste heat recovery system and method

Abstract

The invention relates to the field of general heat exchange, and provides a waste heat recovery system and method.The waste heat recovery system comprises a sending pump, a feeding pipeline and a heat recovery unit, the output end of the sending pump is provided with a fluidization pipe, a fluidization gas circuit and a feeding gas circuit, and a discharge valve is arranged between the sending pump and the fluidization pipe; the heat recovery unit comprises a recovery pipeline and a storage tank. The heat dissipated by the feeding pipeline is recovered through the fluid medium in the recovery pipeline, and the heated fluid medium can be output for use, so that the energy utilization efficiency is improved, and the production cost is reduced. And moreover, the damage of high-temperature ash to the waste heat recovery system can be effectively reduced through the recovery effect, the service life of equipment is prolonged, and the maintenance cost is reduced. And meanwhile, through accurate temperature and pressure control, it is ensured that the material conveying process is stable, the conveying risk is remarkably reduced, and the safety of overall production is improved.

Description

Technical Field

[0001] The present invention relates to the general field of heat exchange, and particularly to a waste heat recovery system and method. Background Art

[0002] In chemical metallurgy, cement, steel, and furnace kiln projects, high-temperature ash above 500 °C is generated along with the process requirements. The treatment of this part of the ash is difficult. The traditional mechanical transportation has great risks, and there are relatively large risks in using steel structures during the process of storing high-temperature ash; the treatment of high-temperature ash is highly dangerous and can easily cause great danger to steel structures, waste heat recovery systems, and personnel, belonging to a highly risky hazard source; the risk of high-temperature ash transfer is also very high. Thus, the treatment of this high-temperature ash becomes a difficult and dangerous task. Summary of the Invention

[0003] The purpose of the present invention is to provide a waste heat recovery system, aiming to improve the problems that in the existing industrial production process, the operation of high-temperature ash generated causes relatively high damage to the waste heat recovery system and there are transportation risks.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A waste heat recovery system includes: A sending pump, at the output end of which there are a fluidization pipe, a fluidization gas path for fluidizing the particulate material with heat in the fluidization pipe, and a feeding gas path for providing a discharging air flow to the fluidized material. A discharging valve is provided between the sending pump and the fluidization pipe; A feeding pipeline, the starting end of which is connected and arranged on the fluidization pipe or at the output end of the feeding gas path; and A heat recovery unit, which includes a recovery pipeline for recovering the heat of the feeding pipeline, and a storage tank connected to both ends of the inlet and outlet of the recovery pipeline.

[0005] Preferably, an assisting gas path for assisting discharging and a first thermometer for monitoring the temperature inside the sending pump are provided at the top of the sending pump.

[0006] Preferably, a discharging fan is provided at the starting end of the feeding gas path; An accelerating valve head is provided at the connecting port of the feeding gas path and the fluidization pipe, and a supplementary gas path is provided at the starting end of the feeding pipeline; a slow-down head for particulate material is provided on the fluidization pipe.

[0007] Preferably, a plurality of the recovery pipelines are provided, and a pressure tank is provided between the plurality of recovery pipelines for sequential connection; A first pressure pump is provided on the output and / or input pipeline of at least one of the pressure tanks.

[0008] Preferably, a plurality of storage tanks are provided. The plurality of storage tanks include at least one heat medium storage tank, at least one mixing storage tank, and at least one refrigerant storage tank. The heat medium storage tank is provided with a heat medium output pipeline; The output end of the pressure tank is communicatively connected to the input end of the heat medium storage tank. The mixing storage tank is communicatively connected to the input end of the pressure tank. The output end of the refrigerant storage tank is communicatively connected to the first input end of the mixing storage tank. The heat medium storage tank is communicatively connected to the second input end of the mixing storage tank; Let the number of pressure tanks be an integer N greater than 0. The effective utilization amount of the effective heat Q of the heat coal fluid medium in the heat medium storage tank is: Where: T1 to T N is the water temperature of the pressure tank, and the subscripts from 1 to N refer to different pressure tanks; T g is the water temperature of the high-temperature water tank; H g is the liquid level of the high-temperature water tank; M g is the water volume of the high-temperature water tank; M w is the water volume of the water sent out; T z is the water temperature of the mixing water tank; H z is the liquid level of the mixing water tank; M z is the water volume of the mixing storage tank; T d is the water temperature of the cold-temperature water tank; H d is the liquid level of the cold-temperature water tank; M d is the water volume of the cold-temperature water tank; C is the specific heat capacity.

[0009] Preferably, a storage bin is further included. The output end of the feeding pipeline is arranged on the input end of the storage bin; A circulation pipeline communicating with the starting end of the feeding pipeline is arranged on the storage bin. A dust collector and a fan are sequentially arranged on the starting section of the circulation pipeline along the air flow direction. A circulation fan is arranged at the end section of the circulation pipeline.

[0010] Preferably, the storage bin is further provided with a gasification pipeline for cooling the inside of its own cavity, a second thermometer for monitoring the temperature of the storage bin, and a pressure balance valve for adjusting the pressure in the bin. The gasification pipeline is sequentially provided with a gasification fan, a gasification valve, and a plurality of gasification branch pipes along the conveying direction. A plurality of air outlets located inside the storage bin are arranged on the gasification branch pipes.

[0011] The purpose of the present invention is to provide a waste heat recovery method, aiming to improve the operation of the high-temperature ash generated in the existing industrial production process, which has a high destructive effect on the waste heat recovery system and has a conveying risk problem.

[0012] There is also provided a waste heat recovery method for implementing the waste heat recovery system as described above, including the following steps: Pressurize the particulate material with heat by a sending pump and make the pressure value in the sending pump reach the first state; Fluidize the particulate material with air flow at the starting end of the conveying and drive it to convey along the feeding pipeline by the air flow; During the process that the particulate material is fluidized and conveyed into the feeding pipeline, adjust the output by supplementing air flow and / or a dropping head; Input a fluid medium into the heat recovery pipe wound around the feeding pipeline to recover the heat dissipated by the particulate material to the feeding pipeline; Convey the particulate material after heat recovery to a silo for storage.

[0013] Preferably, detect the temperature of the particulate material in the sending pump. If the detected temperature is greater than or equal to the first set temperature value, close the fluidizing air path for fluidizing the particulate material and open the air supplementing air path at the starting end of the feeding pipeline; when the detected temperature is less than the set temperature value, open the fluidizing air path and close the air supplementing air path; When the detected temperature is less than the artificially set temperature value and continuously less than the time reaches the first set duration, open the feeding air path and increase the pressure in the sending pump to the second state, and the pressure value of the second state is greater than the pressure value of the first state; When the pressure value in the sending pump is less than the third state and remains for more than the second set duration in the state that the feeding air path is in an open operation state, the discharging ends and the machine shuts down.

[0014] Preferably, detect the temperature of the recovered fluid medium. If the detected temperature value is greater than or equal to the second set temperature value, output the recovered and heated heat transfer fluid medium and supplement the refrigerant fluid medium into the heat recovery pipe until the detected temperature value is less than the second set temperature value, then stop the output and supplementation.

[0015] After adopting the above technical solution, compared with the background technology, the present invention has the following advantages: 1. The present invention recovers the heat dissipated by the fluid medium in the recovery pipeline to the feeding pipeline. The heated fluid medium can be output for use, improving the energy utilization efficiency and reducing the production cost. Moreover, the recovery function can effectively reduce the damage of high-temperature ash to the waste heat recovery system, extend the service life of the equipment, and reduce the maintenance cost. At the same time, through precise temperature and pressure control, the stability of the material conveying process is ensured, the conveying risk is significantly reduced, and the overall production safety is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the waste heat recovery system described in the present invention; Figure 2 Schematic diagram of the waste heat recovery system according to the present invention having multiple recovery pipelines; Figure 3 Partial view of the sending pump and output position of the waste heat recovery system according to the present invention; Figure 4 Partial view of the storage bin of the waste heat recovery system according to the present invention; Figure 5 Schematic diagram when multiple storage tanks are provided in the waste heat recovery system according to the present invention; Figure 6 Flow chart of the waste heat recovery method according to the present invention.

[0017] Explanation of reference numerals: 10, sending pump; 101, fluidization pipe; 102, fluidization gas path; 103, feeding gas path; 104, discharging valve; 105, assisting gas path; 106, first thermometer; 1011, slow-down head; 1031, discharging fan; 1032, acceleration valve head; 20, feeding pipeline; 201, air supplement gas path; 30, heat recovery unit; 301, recovery pipeline; 302, storage tank; 3011, pressure tank; 3012, first pressure pump; 3021, heat medium storage tank; 3022, mixing storage tank; 3023, refrigerant storage tank; 40, storage bin; 401, circulation pipeline; 402, dust collector; 403, fan; 404, circulation fan; 405, gasification pipeline; 406, second thermometer; 407, pressure balance valve; 4051, gasification fan; 4052, gasification valve; 4053, gasification branch pipe; 4054, air outlet. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] In addition, it should be noted that: the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the devices or elements of the present invention must have a specific orientation, so they should not be construed as a limitation to the present invention.

[0020] When an element is referred to as being "fixed to" or "disposed on" or "provided on" another element, it can be directly on the other element or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to that other element.

[0021] Unless otherwise clearly specified and defined, the terms "mounted", "connected", and "joined" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0022] Embodiment 1 Please refer to Figure 1 、 Figure 3 and Figure 4 As shown in, this embodiment provides a waste heat recovery system, including a sending pump 10, a feeding pipeline 20, and a heat recovery unit 30. The output end of the sending pump 10 is provided with a fluidization pipe 101, a fluidization gas path 102 for fluidizing the particulate material with heat in the fluidization pipe 101, and a feeding gas path 103 for providing a discharging air flow for the fluidized material. A discharging valve 104 is provided between the sending pump 10 and the fluidization pipe 101; the starting end of the feeding pipeline 20 is communicatively connected to the fluidization pipe 101 or is provided at the output end of the feeding gas path 103; the heat recovery unit 30 includes a recovery pipeline 301 for recovering the heat dissipated by the recovered material on the feeding pipeline 20, and a storage tank 302 communicatively connected to both ends of the inlet and outlet of the recovery pipeline 301.

[0023] Specifically, a material storage bin can be used to store high-temperature particulate material (such as high-temperature ash), and it is communicatively connected to the sending pump 10 through a pipeline. Through valve control for conveying, the purpose of stably conveying high-temperature particulate material to the sending pump 10 is achieved. Subsequently, the sending pump 10 pressurizes and sends the high-temperature particulate material into the fluidization pipe 101. In the fluidization pipe 101, the particulate material is fluidized by the gas input by the fluidization gas path 102 to form a conveying purpose in a suspended state, so as to form a relatively high-speed running effect of the particulate matter.

[0024] Further, after starting the sending pump 10 and the heat recovery unit 30, open the discharge valve 104 to convey the high-temperature granular material into the fluidization pipe 101, so that the high-temperature granular material forms fluidization in the fluidization pipe 101 under the action of the fluidization gas path 102, and then is discharged into the feeding pipeline 20 through the exhaust air path of the feeding gas path 103, thus achieving the purpose of conveying the high-temperature granular material in the feeding pipeline 20. The heat dissipated by the high-temperature granular material during the conveying process is recovered by means of heat transfer through the recovery pipeline 301 in the heat recovery unit 30, and through the circulating flow between the storage tank 302 and the recovery pipeline 301, the heat on the feeding pipeline 20 is absorbed by the fluid medium for recovery and finally stored in the storage tank 302 of the recovery unit. The storage tank 302 can supply the recovered relatively hot fluid medium to other heat energy utilization systems or output and store it (the corresponding replenishment will be carried out for the output fluid medium) to achieve the maximum utilization of waste heat.

[0025] Further, the fluid medium can be a liquid, such as water or a liquid medium with good thermal conductivity to achieve good heat recovery. The liquid medium with good thermal conductivity can be ethylene glycol or other organic solvents, and they effectively transfer heat in the fluidization gas path 102 and the heat recovery unit. Such a design not only improves the thermal efficiency of the system, but also enhances the stability and reliability of the system. Through this efficient heat recovery method, the system can continuously provide the required energy for relevant technological processes, while significantly reducing energy consumption, reflecting the concept of sustainable development.

[0026] Such as Figure 1 and Figure 3As shown, in this embodiment, an assisting air path 105 for assisting in discharging materials and a first thermometer 106 for monitoring the temperature inside the sending pump 10 are provided at the top of the sending pump 10. The model of the first thermometer 106 can be a thermometer of testo 905T2. This thermometer can accurately measure the temperature change inside the sending pump 10, ensure that the system operates within the optimal temperature range, and can slow down the operating speed of the sending pump 10 (when overheated, greater than the set value, such as 500°C, 600°C, 700°C, 800°C, 900°C or 1000°C, etc.) to slow down the feeding, thereby avoiding damage to the waste heat recovery system caused by excessive temperature, extending the service life of the waste heat recovery system, and improving the overall operating efficiency. At the same time, the real-time monitoring of temperature data provides a reliable basis for system optimization. If the temperature inside the sending pump 10 is lower than the set value, the sending pump 10 will accelerate the feeding, so as to ensure the rate of the entire conveying. If the temperature inside the sending pump 10 is lower than the shutdown set value and continues to be lower than this value, it can be judged that there is no feeding, and the waste heat recovery system can be automatically shut down to prevent idling loss. This intelligent temperature control mechanism not only improves the adaptive ability of the system, but also further ensures the safety and long-term stability of the waste heat recovery system, fully reflecting the design concept of refined management and high-efficiency operation.

[0027] As Figure 1 and Figure 3 shown, in this embodiment, a discharge fan 1031 is provided at the starting end of the feeding air path 103; an acceleration valve head 1032 is provided at the connection port of the feeding air path 103 and the fluidization tube 101, a supplementary air path 201 is provided at the starting end of the feeding pipeline 20, and a slow-down head 1011 for granular materials is provided on the fluidization tube 101. The waste heat recovery system provides the airflow power required for conveying through a fan, such as using a Roots blower 403 and corresponding units to provide the required wind force to ensure smooth gas flow in the feeding air path 103 and avoid material accumulation caused by insufficient airflow. Further, by using the acceleration valve head 1032, the output of the wind force can be increased to ensure stable airflow power even in a high-temperature environment. And, a Venturi tube can be provided at the position where it is connected to the conveying pipeline, and the Venturi effect is used to enhance the airflow speed and optimize the material conveying efficiency.

[0028] Further, through the slow-down head 1011 on the fluidization tube, the speed of the granular materials output by the sending pump 10 can be controlled to form fluidization, and at the same time, the conveying amount can be adjusted for the purpose of efficient conveying.

[0029] As Figure 2 and Figure 5As shown in the figure, in this embodiment, multiple recovery pipelines 301 are provided. A pressure tank 3011 is provided between the multiple recovery pipelines 301 for sequential connection. The recovery pipeline 301 can be a metal hose for winding and installing on the pipeline. A first pressure pump 3012 is provided on the output and / or input pipeline of at least one pressure tank 3011. In this way, different numbers of recovery pipelines 301 can be designed according to requirements to ensure efficient recovery, flexibly meet the needs of different working conditions, and maximize the heat recovery efficiency. Specifically, multiple recovery pipelines 301 can be sequentially connected through the pressure tank 3011, and cooperate with the pressurized transportation of the first pressure pump 3012 (i.e., the pressure pump) to form a closed-loop circulation system with the storage tank 302 to ensure efficient heat transfer. Through the buffering effect of the pressure tank 3011, the conveying pressure is stabilized to avoid the influence of fluctuations. At the same time, regulating valves are provided between the pipelines to accurately control the flow rate, optimize the heat distribution, and further improve the overall thermal efficiency of the system.

[0030] Furthermore, the fluid medium conveying scheme of the recovery pipeline 301 can be set in the opposite direction to the conveying direction of the feeding pipeline 20. In this way, the temperature of the fluid medium at the tail section can be the lowest, so as to ensure that the temperature of the conveyed high-temperature granular material is lower than the required temperature value, effectively avoiding heat loss.

[0031] As Figure 2 and Figure 5 As shown in the figure, in this embodiment, multiple storage tanks 302 are provided. The multiple storage tanks 302 include at least one heat medium storage tank 3021, at least one mixing storage tank 3022, and at least one refrigerant storage tank 3023. The heat medium storage tank 3021 is provided with a heat medium output pipeline; the output end of the pressure tank 3011 is connected to the input end of the heat medium storage tank 3021, the mixing storage tank 3022 is connected to the input end of the pressure tank 3011, the output end of the refrigerant storage tank 3023 is connected to the first input end of the mixing storage tank 3022, and the heat medium storage tank 3021 is connected to the second input end of the mixing storage tank 3022.

[0032] Specifically, through the setting of multiple storage tanks 302, they can be used for classification. The heat medium storage tank 3021 is a storage tank 302 for the fluid medium that recovers heat. In this way, when the required heat is met, it can be conveyed and used to achieve the purpose of waste heat recovery. When the temperature of the fluid medium recovered into the heat medium storage tank 3021 is insufficient, it can be conveyed to the mixing storage tank 3022. When the fluid medium in the mixing storage tank 3022 is insufficient, the refrigerant fluid medium in the refrigerant storage tank 3023 is supplemented for mixing, and then the mixed fluid medium is conveyed to the recovery pipeline 301 for heat recovery. In this way, a dynamic adjustment mechanism and a cyclic heat recovery system are formed to ensure efficient utilization of waste heat under different working conditions and improve the overall energy utilization rate.

[0033] Furthermore, valves are installed on the pipelines between the refrigerant storage tank 3023, the heat medium storage tank 3021 and the mixing storage tank 3022 for on-off control, so as to adjust the input, output and circulation control. When the power of the fluid medium circulation is insufficient, a pressure pump can also be installed to enhance the circulation power and transport it in the required direction to ensure the stable operation of the system. The intelligent control system monitors the medium temperature and flow rate in each tank, adjusts the valve opening and the operation state of the pump in real time, accurately matches the heat recovery demand, and realizes the optimal heat distribution and utilization.

[0034] Specifically, let the number of pressure tanks be an integer N greater than 0, and the effective utilization amount of the effective heat Q of the heat medium fluid medium in the heat medium storage tank is: Where: T1 to TN are the water temperatures of the pressure tanks, and the subscripts from 1 to N refer to different pressure tanks; Tg is the water temperature of the high-temperature water tank; Hg is the liquid level of the high-temperature water tank; Mg is the water volume of the high-temperature water tank; Mw is the external water supply volume; Tz is the water temperature of the mixing water tank; Hz is the liquid level of the mixing water tank; Mz is the water volume of the mixing storage tank; Td is the water temperature of the cold-temperature water tank; Hd is the liquid level of the cold-temperature water tank; Md is the water volume of the cold-temperature water tank; C is the specific heat capacity.

[0035] As Figure 1 and Figure 4 shown, this embodiment also includes a storage bin 40, and the output end of the feeding pipeline 20 is arranged on the input end of the storage bin 40; a circulation pipeline 401 communicating with the starting end of the feeding pipeline 20 is arranged on the storage bin 40. A dust collector 402 and a fan 403 are arranged in sequence along the air flow direction at the starting section of the circulation pipeline 401, and a circulation fan 404 is arranged at the end section of the circulation pipeline 401. A pressure balance valve 407 can also be installed on the storage bin 40, which can ensure that the air pressure in the storage bin 40 is within a safe range value and improve the safety of use.

[0036] Specifically, the storage bin 40 is used to store granular materials to form an effect of storing for standby. The design of the storage bin 40 takes into account the fluidity of the materials to ensure that the granular materials do not get blocked during the conveying process. A circulation pipeline 401 is designed in the storage bin 40, and the air flow conveyed into the storage bin 40 is taken out by the fan 403 and conveyed to the starting end of the conveying pipeline. The dust collector 402 can avoid taking away the granular materials to form a recycling of the air flow. Subsequently, a circulation fan 404 can also be used to supplement the wind force to ensure the stability of the air flow and improve the material conveying efficiency.

[0037] As Figure 1 and Figure 4As shown in the figure, in this embodiment, the storage bin 40 is further provided with a gasification pipeline 405 for cooling the inside of its own cavity and a second thermometer 406 for monitoring the temperature of the storage bin 40. The gasification pipeline 405 is sequentially provided with a gasification fan 4051, a gasification valve 4052 and a plurality of gasification branch pipes 4053 along the conveying direction. A plurality of air outlets 4054 located inside the storage bin 40 are provided on the gasification branch pipes 4053. The second thermometer 406 can also be a thermometer of testo 905T2, which is used to monitor the temperature change inside the storage bin 40 in real time to ensure the safety of material storage. If the temperature inside the storage bin 40 rises abnormally, the gasification fan 4051 can be turned on to blow in air for cooling, and then the temperature of the storage bin 40 can be controlled. After the temperature returns to the normal range, the gasification fan 4051 is turned off to maintain the stable operation of the system.

[0038] Embodiment Two As Figure 6 shown in the figure, this embodiment provides a waste heat recovery method for implementing the waste heat recovery system in Embodiment One, including the following steps: S101. Pressurize the particulate material with heat through a sending pump and make the pressure value inside the sending pump reach the first state.

[0039] Specifically, through pressurization by the sending pump until the inside of the sending pump reaches the first state, the pressure value of the first state can be set according to the model of the waste heat recovery system to ensure the smooth output of the particulate material. Cooperating with the output valve of the sending pump, the flow rate is precisely controlled to ensure the uniform conveyance of the material to the next link.

[0040] S102. Fluidize the particulate material with air at the starting end of the conveyance and drive it to convey along the feeding pipeline through the air flow.

[0041] Fluidize the particulate material with air flow, and then convey it to the conveying pipeline. Use the circulating air flow for material conveyance to achieve the purpose of high efficiency and energy conservation.

[0042] S1021. During the process that the particulate material is fluidized and conveyed into the feeding pipeline, adjust the output quantity through the supplementary air flow and / or the slow-down head.

[0043] In this way, the quantity input into the conveying pipeline can be adjusted to ensure fluidized conveyance, and / or, the pipeline heat of the conveying pipeline can be controlled to prevent insufficient heat recovery efficiency caused by too high temperature; or, too low temperature, resulting in a reduction in conveying power or power waste of the equipment for recovering heat. In this way, timely adjustment and control can be carried out to ensure the efficient operation of the equipment.

[0044] S103. Input a fluid medium into the heat recovery pipe wound around the feeding pipeline to recover the heat dissipated by the particulate material to the feeding pipeline.

[0045] A metal hose can be wound around the feeding pipeline, and a cooling medium, such as water or a liquid with good heat conduction, is introduced into the metal hose. The heat of the granular material is absorbed by the cooling medium, effectively reducing the temperature of the material, preventing damage to the waste heat recovery system caused by high temperature, and at the same time recovering the waste heat of the granular material. Through the recycling of the cooling medium, not only the energy utilization efficiency is improved, but also the stability of the production process is ensured, the material handling process is further optimized, and the dual benefits of energy conservation and emission reduction are achieved.

[0046] S104. Convey the granular material that has completed heat recovery to the storage bin for storage.

[0047] After the temperature of the granular material is recovered, the granular material is conveyed to the storage bin for storing the material for storage, waiting for subsequent processing or use. A temperature monitoring device is provided in the storage bin to monitor the temperature in the bin in real time, ensure that the granular material is stored in a suitable environment, prevent damage to the waste heat recovery system caused by temperature fluctuations, improve the safety of use, and extend the service life of the waste heat recovery system.

[0048] In this embodiment, the temperature of the granular material in the sending pump is detected. If the detected temperature is greater than or equal to the first set temperature value, the fluidization gas path for fluidizing the granular material is closed, and the air supplement gas path at the starting end of the feeding pipeline is opened; when the detected temperature is less than the set temperature value, the fluidization gas path is opened and the air supplement gas path is closed; when the detected temperature is less than the artificially set temperature value and continues to be less than for a first set duration, which can be 5 s, 10 s, 15 s, 20 s, 25 s, 30 s, 35 s or 40 s, etc., the feeding gas path is opened, and the pressure in the sending pump is increased to a second state, and the pressure value in the second state is greater than the pressure value in the first state; when the pressure value in the sending pump is less than the third state and remains above the second set duration, which can be 30 s, 50 s or 80 s, etc., during the operation of the feeding gas path, the discharging is ended and the machine is shut down.

[0049] The pressure value in the second state is greater than that in the first state, and the pressure value in the first state is greater than that in the third state. In this way, under different pressure value conditions, the operating state of the waste heat recovery system can be known. The specific pressure value can be specifically set according to the model of the sending pump, and the data will not be given in detail here. For example, under the pressure value in the first state, the waste heat recovery system is in a normal working state; if the pressure value rises to the second state, it indicates that after the waste heat recovery system has been operating for a period of time, the particulate matter has a high heat radiation, resulting in an excessive temperature of the waste heat recovery system. In this case, the operating speed needs to be reduced to slow down the entry of particulate matter with high heat into the sending pump, which can alleviate the problem of the temperature rise in the sending pump and ensure the stable operation of the waste heat recovery system. If the pressure value continues to be less than the pressure value in the third state, it indicates that there is no entry of particulate matter into the waste heat recovery system, and then the shutdown operation can be carried out successively.

[0050] During the shutdown operation, the fan needs to run for a period of time to cool down the waste heat recovery system by air cooling to ensure that the system temperature drops within the safe range before the fan can be shut down to prevent equipment damage caused by residual waste heat.

[0051] In this embodiment, the temperature of the recovered fluid medium is detected. If the detected temperature value is greater than or equal to the second set temperature value, the heated heat transfer fluid medium after recovery is output, and the refrigerant fluid medium is replenished into the heat recovery pipe until the detected temperature value is less than the second set temperature value, at which time the output and replenishment are stopped.

[0052] The temperature can be detected in real time using a water temperature sensor. The models of the water temperature sensor can be WPS-WS100, WPS-WS200, or WPS-WS300, etc., so that the temperature value of the fluid medium can be obtained. By comparing with the second set temperature value (such as 70°C, 80°C, 90°C, or 100°C, etc.), the output can be carried out after reaching the set value to achieve the purpose of using the heat recovered from the fluid medium. When the temperature is insufficient or does not reach the second set temperature value, the heat in the recycling and conveying pipeline continues to be recycled until the temperature meets the preset requirements and then is output. For the output fluid medium, the refrigerant fluid medium can be replenished for heat recovery purposes.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A waste heat recovery system, characterized in that: include: A sending pump, the output end of which is provided with a fluidizing pipe, a fluidizing gas path for fluidizing the hot particulate material in the fluidizing pipe, and a feeding gas path for providing a discharge airflow for the fluidized material, and a discharge valve is provided between the sending pump and the fluidizing pipe; A feeding pipeline, the starting end of which is connected to the fluidizing pipe or is arranged at the output end of the feeding gas circuit; and The heat recovery unit comprises a recovery pipeline for recovering the heat of the feeding pipeline, and a storage tank connected to both ends of the recovery pipeline.

2. The waste heat recovery system according to claim 1, characterized in that: The top of the sending pump is provided with an assisting gas path for assisting discharge, and a first temperature meter for monitoring the temperature inside the sending pump.

3. The waste heat recovery system according to claim 1, characterized in that: A discharge fan is provided at the starting end of the feeding air path; An acceleration valve head is provided at the communication port between the feeding gas circuit and the fluidizing pipe, and an air supply gas circuit is provided at the starting end of the feeding pipeline; The fluidizing pipe is provided with a slow-down head for the granular material.

4. The waste heat recovery system according to claim 1, characterized in that: There are multiple recovery pipes, and pressure tanks are arranged between the multiple recovery pipes to connect them in sequence; A first pressure pump is arranged on the output and / or input pipeline of at least one of the pressure tanks.

5. The waste heat recovery system according to claim 4, characterized in that: The storage tanks are provided in plurality, and the plurality of storage tanks include at least one heat medium storage tank, at least one mixed storage tank and at least one refrigerant storage tank, and the heat medium storage tank is provided with a heat medium output pipeline; The output end of the pressure tank is connected to the input end of the heat medium storage tank, the mixed storage tank is connected to the input end of the pressure tank, the output end of the cold medium storage tank is connected to the first input end of the mixed storage tank, and the heat medium storage tank is connected to the second input end of the mixed storage tank; Assuming that the number of the pressure tanks N is an integer greater than 0, the effective utilization amount of the effective heat Q of the hot coal fluid medium in the heat medium storage tank is: Among them: T1 to T N is the water temperature of the pressure tank, and the base numbers from 1 to N refer to different pressure tanks; T g H is the water temperature of the high temperature water tank; g is the high temperature water tank level; M g is the water volume of high temperature water tank; M w is the amount of water delivered; T z H is the water temperature of the mixing tank; z M is the liquid level of the mixing tank; z is the water volume in the mixed storage tank; T d H is the water temperature of the cold and hot water tanks; d M is the liquid level of cold and hot water tank; d is the water volume in the cold and warm water tanks; C is the specific heat capacity.

6. The waste heat recovery system according to claim 1, characterized in that: It also includes a material storage bin, and the output end of the feeding pipeline is arranged on the input end of the material storage bin; The storage bin is provided with a circulation pipeline connected to the starting end of the feeding pipeline. The starting section of the circulation pipeline is provided with a dust collector and a fan in sequence along the air flow direction, and the end section of the circulation pipeline is provided with a circulation fan.

7. The waste heat recovery system according to claim 6, characterized in that: The storage bin is also provided with a gasification pipeline for cooling its own cavity, a second thermometer for monitoring the temperature of the storage bin, and a pressure balance valve for adjusting the pressure in the bin. The gasification pipeline is provided with a gasification fan, a gasification valve and a plurality of gasification branches in sequence along the conveying direction, and the gasification branch pipes are provided with a plurality of gas outlets located in the storage bin.

8. A waste heat recovery method, characterized in that: A waste heat recovery system for implementing any one of claims 1 to 7, comprising the following steps: Pressurizing the hot particulate material by a sending pump, and making the pressure value in the sending pump reach a first state; At the starting end of the conveying, the granular material is gasified by the air supply and conveyed along the conveying pipeline by the air flow; When the granular material is fluidized and transported to the feeding pipeline, the output is adjusted by adding air flow and / or slow-down head; Inputting fluid medium into the heat recovery pipe wound on the feeding pipeline to recover the heat emitted by the granular material to the feeding pipeline; The pellets that have completed heat recovery are transported to the silo for storage.

9. The waste heat recovery method according to claim 8, characterized in that: The temperature of the granular material in the sending pump is detected. If the detected temperature is greater than or equal to a first set temperature value, the fluidizing gas path for fluidizing the granular material is closed, and the air supply gas path at the starting end of the feeding pipeline is opened; when the detected temperature is less than the set temperature value, the fluidizing gas path is opened, and the air supply gas path is closed; When the detected temperature is lower than the manually set temperature value and remains lower than the temperature for a first set time, the feeding gas path is opened and the pressure in the sending pump is increased to a second state, wherein the pressure value of the second state is higher than the pressure value of the first state; When the feeding gas circuit is in the open running state, when the pressure value in the sending pump is less than the third state and is maintained for more than the second set time, the discharge is completed and the machine is shut down.

10. The waste heat recovery method according to claim 8, characterized in that: The temperature of the recovered fluid medium is detected. If the detected temperature value is greater than or equal to the second set temperature value, the recovered heated hot coal fluid medium is output, and the refrigerant fluid medium is added to the heat recovery pipe until the detected temperature value is less than the second set temperature value, and then the output and addition are stopped.

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