Measurement Device for Comprehensive Heat Transfer Coefficient of Waste Heat Recovery of Solid Particles

Abstract

The present application discloses a device for measuring the comprehensive heat transfer coefficient of solid particle waste heat recovery, which is used to measure the comprehensive heat transfer coefficient of solid particle waste heat recovery and provide guidance for the design of solid particle waste heat recovery equipment. The device for measuring the comprehensive heat transfer coefficient of solid particle waste heat recovery provided in the embodiment of the present application includes a heat preservation chamber for filling solid particles and a heat exchange tube arranged in the heat preservation chamber; the side of the heat preservation chamber is provided with a medium inlet and a medium outlet connected to the heat exchange tube and equipped with a temperature sensor, and a temperature measuring thermocouple is provided in the heat exchange chamber; the temperature measuring thermocouple and the temperature sensor are electrically connected to a temperature display.

Description

Technical Field

[0001] The invention belongs to the technical field of waste heat recovery, and in particular relates to a device for measuring a comprehensive heat transfer coefficient of solid particle waste heat recovery. Background Art

[0002] The waste heat recovery technology for solid particles such as sintered ore has always been a difficult problem that has troubled the world. Most of them use the method of recycling waste heat with ring coolers, which first uses cold air to cool the hot ore, and then enters the waste heat boiler to recover the waste heat. However, due to the large air leakage of the ring cooler, the waste heat is greatly wasted, and the system is bulky, it is gradually being eliminated.

[0003] At present, various places are seeking to realize an integrated device method for waste heat recovery of solid particles, and the use of heat exchange tubes for waste heat recovery is an important form of waste heat recovery. Patents such as CN201810046197.0, CN201810410527X, and CN2017102533095 all have relevant records of using heat exchange tubes for waste heat recovery. However, the above patents involve how to realize waste heat recovery of solid particles, but do not involve the determination of the comprehensive heat transfer coefficient.

[0004] In summary, there is an urgent need in the existing technology to develop a device that can measure the comprehensive heat transfer coefficient of solid particle waste heat recovery to provide guidance for the design of solid particle waste heat recovery equipment. Summary of the Invention

[0005] An embodiment of the present application provides a device for measuring the comprehensive heat transfer coefficient of solid particle waste heat recovery, which is used to measure the comprehensive heat transfer coefficient of solid particle waste heat recovery and provide guidance for the design of solid particle waste heat recovery equipment.

[0006] To this end, the embodiment of the present application provides a device for measuring the comprehensive heat transfer coefficient of solid particle waste heat recovery, comprising a heat preservation cavity for filling solid particles and a heat exchange tube provided in the heat preservation cavity;

[0007] The side of the heat preservation chamber is provided with a medium inlet and a medium outlet which are connected to the heat exchange tube and have a temperature sensor;

[0008] A temperature measuring thermocouple is provided in the heat exchange cavity;

[0009] The temperature measuring thermocouple and the temperature sensor are electrically connected to the temperature display.

[0010] In some embodiments, the temperature measuring thermocouples are arranged in multiple groups along the axial direction of the heat exchange cavity;

[0011] Each group of thermocouples consists of at least four thermocouples that are located in the same cross section of the heat exchange cavity and are evenly arranged.

[0012] In some embodiments, the heat exchange tube is a spiral heat exchange tube.

[0013] In some embodiments, the top and bottom of the heat preservation chamber are respectively provided with a solid particle feed port and a solid particle discharge port;

[0014] The solid particle feed port is provided with an openable and closable heat-insulating top cover;

[0015] The solid particle discharge port is provided with an openable and closable heat-insulating discharge plate.

[0016] In some embodiments, the method further comprises a heat preservation barrel disposed at the bottom of the heat preservation chamber and docked with the solid particle discharge port;

[0017] The heat preservation barrel is filled with a cooling medium.

[0018] In some embodiments, the solid particle feed port and the solid particle discharge port are both in an inverted cone shape.

[0019] In some embodiments, the insulation lining of the insulation chamber is provided with a slide groove adapted to the insulation discharge plate;

[0020] The outer shell of the heat preservation chamber is provided with an opening corresponding to the chute;

[0021] The heat-insulating discharge plate is inserted into the chute from the opening to close the solid particle discharge port.

[0022] In some embodiments, the system further comprises a heating device, a material storage heating hopper disposed in the heating device, and a material taking rod for taking the material storage heating hopper out of the heating device;

[0023] The top of the storage heating hopper is open and is used to accommodate solid particles;

[0024] At least two hanging ears cooperating with the material taking rod are arranged side by side on the top of the material storage and heating bucket;

[0025] The material taking rod is also provided with a plug plate to prevent the material taking rod from rotating;

[0026] The material storage and heating bucket is provided with a slot matched with the plug board.

[0027] In some embodiments, the solid particles are sintered ore.

[0028] In some embodiments, the heating device is a muffle furnace.

[0029] Compared with the prior art, the embodiment of the present application has the following advantages: by changing the type and flow rate of the heat exchange medium in the heat exchange tube, the comprehensive heat transfer coefficient under different conditions can be obtained. It is only necessary to record the time, mine temperature, inlet and outlet medium temperatures, and the heat transfer coefficient q = cm (T 初 -T 终 )=KA((T 初 +T 终 ) / 2-(T 进 +T 出 ) / 2), c is the solid specific heat, m is the mass of the solid particles, A is the contact area between the heat exchange tube and the solid particles, T 初 is the initial temperature of the solid particles, T 终 is the final temperature of the solid particles, T 进 is the temperature of the heat transfer medium before heat exchange, T 出 The comprehensive heat transfer coefficient K can be calculated by taking the temperature of the heat exchange medium after heat exchange, which can provide guidance for the design of solid particle waste heat recovery equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is a structural diagram of the heat preservation chamber involved in the embodiment of the present application;

[0032] Figure 2 is an exploded view of the heat preservation chamber involved in the embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the heat exchange tube structure in the embodiment of the present application;

[0034] Figure 4 This is a structural diagram of the assembly of the material taking rod and the material storage heating bucket involved in the embodiment of the present application;

[0035] Figure 5 It is a structural schematic diagram of the waste heat recovery comprehensive heat transfer coefficient measuring device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] This embodiment of the present application provides a device for measuring the comprehensive heat transfer coefficient of solid particle waste heat recovery, which is used to measure the comprehensive heat transfer coefficient of solid particle waste heat recovery and provide guidance for the design of solid particle waste heat recovery equipment. This embodiment of the present application uses sintered ore as an example, but the solid particles can also be other particulate materials that require waste heat recovery as known in the art.

[0038] See also Figure 1 、 Figure 2 and Figure 5 The solid particle waste heat recovery comprehensive heat transfer coefficient measuring device provided in the embodiment of the present application includes an insulation cavity 1 for filling solid particles and a heat exchange tube 2 arranged in the insulation cavity 1, and the heat exchange tube 2 is buried in the solid particles.

[0039] The insulation cavity 1 and the heat exchange tube 2 are similar models obtained by scaling the characteristic proportions based on the insulation cavity and heat exchange elements of the existing solid particle waste heat recovery equipment through similarity theory.

[0040] A medium inlet 3 and a medium outlet 4 are provided on the side of the heat-insulating chamber 1. These are connected to the heat-exchange tube 2 and are equipped with a temperature sensor (not shown). The inner cavity of the heat-exchange tube directly constitutes a heat-exchange chamber for filling solid particles. The heat-exchange medium enters the medium inlet 3, passes through the heat-exchange tube 2, exchanges heat with the sintered ore in the heat-exchange chamber, and then flows out of the medium outlet 4. The temperature of the heat-exchange medium in the medium inlet 3 and the medium outlet 4 is measured by a temperature sensor. A thermocouple 5 is also provided in the heat-exchange chamber to measure the temperature of the solid particles in the heat-exchange chamber. The thermocouple 5 and the temperature sensor are electrically connected to a temperature display 6. The temperature measured by the thermocouple 5 and the temperature sensor is displayed on the temperature display 6. Figure 3 Specifically, in the embodiment of the present application, the heat exchange tube 2 is a spiral heat exchange tube.

[0041] In the embodiment of the present application, high-temperature solid particles are placed in the heat exchange chamber to exchange heat with the heat exchange tube 2. By changing the type and flow rate of the heat exchange medium in the heat exchange tube 2, the comprehensive heat transfer coefficient under different conditions can be obtained. It is only necessary to record the time, mine temperature, inlet and outlet medium temperatures, and the heat transfer coefficient q = cm (T 初 -T 终 )=KA((T 初 +T 终 ) / 2-(T进 +T 出 ) / 2), c is the solid specific heat, m is the mass of the solid particles, A is the contact area between the heat exchange tube 2 and the solid particles, T 初 is the initial temperature of the solid particles, T 终 is the final temperature of the solid particles, T 进 is the temperature of the heat transfer medium before heat exchange, T 出 The comprehensive heat transfer coefficient K can be calculated by taking the temperature of the heat exchange medium after heat exchange, which can provide guidance for the design of solid particle waste heat recovery equipment.

[0042] It should be explained that, to ensure the accuracy of temperature measurement, multiple groups of temperature measuring thermocouples 5 are arranged along the axial direction of the heat exchange cavity; each group of thermocouples 5 consists of at least four thermocouples 5 located in the same cross section of the heat exchange cavity and evenly arranged.

[0043] See also Figure 1 and Figure 2 In some embodiments, a solid particle feed port and a solid particle discharge port are provided at the top and bottom of the insulation chamber 1, respectively. The solid particle feed port is provided with an openable and closable insulation top cover 7, and the solid particle discharge port is provided with an openable and closable insulation discharge plate 8.

[0044] In the embodiment of the present application, during testing, the heat-insulating top cover 7 is opened, and after the high-temperature sintered ore is fed into the heat exchange chamber from the solid particle feed port, the heat-insulating top cover 7 is quickly closed. The high-temperature sintered ore in the heat exchange chamber exchanges heat with the heat exchange medium such as cooling water in the heat exchange tube 2 to achieve cooling. After the cooling is completed, the low-temperature sintered ore is discharged from the solid particle discharge port.

[0045] See also Figure 1 、 Figure 2 and Figure 5 In other embodiments, the measuring device of the embodiment of the present application further includes an insulation barrel 9 arranged at the bottom of the insulation chamber 1 and docked with the solid particle discharge port. The insulation lining 101 of the insulation chamber 1 is provided with a chute 10 adapted to the insulation discharge plate 8. The outer shell 102 of the insulation chamber 1 is provided with an opening corresponding to the chute 10. The insulation discharge plate 8 is inserted from the opening into the chute 10 to close the solid particle discharge port. The insulation barrel 9 is filled with cooling water or other cooling media. In the embodiment of the present application, a drawer-type unloading structure is adopted, which makes unloading quick and convenient. In addition, the insulation barrel 9 is filled with cooling water for cooling the ore and checking the discharge temperature of the ore. In actual applications, the insulation layer of the insulation top cover 7 and the insulation discharge plate 8 can be made of insulation rock wool.

[0046] In addition, to facilitate feeding and unloading, the solid particle feeding port and the solid particle discharging port are both inverted cone-shaped.

[0047] See also Figure 1 、 Figure 4 and Figure 5 In other embodiments, the measuring device of the present application further includes a heating device 11, a storage heating hopper 12 disposed in the heating device 11, and a pick-up rod 13 for removing the storage heating hopper 12 from the heating device 11. The storage heating hopper 12 is provided with an opening at the top for accommodating solid particles; at least two lugs 14 are provided side by side on the top of the storage heating hopper 12, which cooperate with the pick-up rod 13; the pick-up rod 13 is also provided with a plug 15 to prevent the pick-up rod 13 from rotating; and the storage heating hopper 12 is provided with a slot 16 that cooperates with the plug 15. When the sintered ore in the storage heating hopper 12 is heated to a set temperature, the plug on the pick-up rod 13 is inserted into the slot and the pick-up rod 13 is simultaneously engaged with the barb of the lug 14. At this time, the pick-up rod 13 cannot rotate freely due to the restriction of the slot. The handheld end of the pick-up rod 13 is held to remove the storage heating hopper 12 from the heating device 11 and quickly introduce it into the insulation chamber 1. The heating device 11 , the heat preservation barrel, the heat preservation chamber and the temperature display 6 are all arranged on the base 17 .

[0048] In the embodiment of the present application, the storage heating bucket 12 and the material-taking rod 13 are matched at the hanging ear 14 and the slot respectively, which not only strengthens the strength of the material-taking rod 13 when pouring the ore, but also prevents the material-taking rod 13 from slipping out when pouring the ore. At the same time, the insert plate 15 can control the pouring angle during the pouring process, which is conducive to rapid pouring and prevents the pouring material from being unhooked; finally, the material-taking rod 13 and the hanging ear 14 are matched with a circular structure, which is conducive to the operation of the ore when entering and exiting the heating device 11.

[0049] It should be noted that, in the actual design, the entire wall of the storage and heating hopper 12, except for the reserved ore discharge outlet, is porous, with an open porosity of approximately 20%-40%. This helps reduce overall weight while ensuring sufficient strength. It also increases the intensity of radiant heat exchange, effectively shortening heating time. Furthermore, the weight of the storage and heating hopper 12 is kept at 15kg, and the sintered ore capacity is kept at 15kg. This allows a 65kg adult man to easily discharge the ore, ensuring high operability.

[0050] In practical applications, the heating device 11 can be a muffle furnace. In the embodiment of the present application, a muffle furnace control system with automatic temperature control is used to ensure the ore discharge temperature. In order to ensure the ore discharge temperature is stable, after heating to the test temperature, the temperature is stabilized for 5-20 minutes according to the amount of cold ore.

[0051] In the embodiments of this application, the entire measuring device is manufactured at a low cost. Except for the precise measuring instruments and muffle furnace, all other components are factory-made using ordinary steel and rock wool insulation. This measuring device has a simple structure and low cost, making it suitable for the design and application of solid waste heat recovery devices.

[0052] When using the above-mentioned measuring device to measure the comprehensive heat transfer coefficient of sintered ore, first, the cold ore is loaded into the storage heating bucket 12 and heated to 300-1000°C by the heating device 11. The temperature is controlled by the small program of the heating device 11 and maintained at the set temperature for about 10 minutes to ensure that the interior of the sintered ore is completely heated and the temperature remains consistent. Secondly, the heated storage heating bucket 12 is taken out of the heating device 11 using the material taking rod 13 and quickly poured into the insulation chamber 1. The inlet and outlet water or steam temperature and the ore temperature are recorded at different times. According to q=cm(T 初矿 -T 终矿 )=KA((T 初矿 +T 终矿 ) / 2-(T 进水 / 水蒸气 +T 出水 / 水蒸气 ) / 2) to calculate the comprehensive heat transfer coefficient K. This implementation scheme uses an inlet flow rate of 500ml / min, a constant inlet water temperature of 20°C, and an outlet water temperature determined by the heat exchange element structure with a lag time of 30.5s to determine the final ore temperature and outlet water temperature.

[0053] The above embodiments are merely examples to clearly illustrate the present invention and are not intended to limit its implementation. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to provide an exhaustive list of all embodiments. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. Solid particle waste heat recovery comprehensive heat transfer coefficient measurement device, characterized by: It comprises a heat preservation cavity for filling solid particles and a heat exchange tube arranged in the heat preservation cavity; The side of the heat preservation chamber is provided with a medium inlet and a medium outlet which are connected to the heat exchange tube and have a temperature sensor; A temperature measuring thermocouple is provided in the heat exchange cavity, and the temperature measuring thermocouple and the temperature sensor are electrically connected to the temperature display; The heat exchange tube is a spiral heat exchange tube; The temperature measuring thermocouples are arranged in multiple groups along the axial direction of the heat exchange cavity; Each group of thermocouples consists of at least four thermocouples located in the same cross section of the heat exchange cavity and evenly arranged; the top and bottom of the heat preservation cavity are respectively provided with a solid particle feed port and a solid particle discharge port; The solid particle feed port is provided with an openable and closable heat-insulating top cover; The solid particle discharge port is provided with an openable and closable heat-insulating discharge plate; and further comprises a heat-insulating barrel provided at the bottom of the heat-insulating chamber and docked with the solid particle discharge port; The heat preservation barrel is filled with a cooling medium; The insulation lining of the insulation cavity is provided with a slide groove adapted to the insulation discharge plate; The outer shell of the heat preservation chamber is provided with an opening corresponding to the chute; The heat-insulating discharge plate is inserted into the chute from the opening to close the solid particle discharge port; It also includes a heating device, a material storage heating hopper arranged in the heating device, and a material taking rod for taking the material storage heating hopper out of the heating device; The top of the storage heating hopper is open and is used to accommodate solid particles; At least two hanging ears cooperating with the material taking rod are arranged side by side on the top of the material storage and heating bucket; The material taking rod is also provided with a plug plate to prevent the material taking rod from rotating; The material storage and heating bucket is provided with a slot matched with the plug board.

2. The measuring device according to claim 1, characterized in that: The solid particle feed port and the solid particle discharge port are both in an inverted cone shape.

3. The measuring device according to claim 1 or 2, characterized in that: The solid particles are sintered ore.

4. The measuring device according to claim 1 or 2, characterized in that: The heating device adopts a muffle furnace.

Images