Heat recovery device for edible salt factory

Abstract

The present invention relates to the field of heat recovery technology, and in particular to a heat recovery and utilization device for an edible salt factory. The device comprises: a fluidized bed: a hot air inlet is provided at the bottom of the fluidized bed, and a hot air outlet is provided at the bottom of the fluidized bed; a heat exchanger: used to heat the gas and continuously supply hot air to the fluidized bed; the air outlet of the heat exchanger is connected to the hot air inlet through a heat transfer pipe; a heat recovery pipe: one end of the heat recovery pipe is connected to the hot air outlet, and the other end is connected to the air inlet of the heat exchanger; a dust collector: arranged on the heat recovery pipe between the fluidized bed and the heat exchanger, and used to adsorb dust impurities in the heat recovery pipe; a cyclone separator: arranged on the heat recovery pipe close to the hot air outlet, and used to collect dust salt brought out by the hot air of the fluidized bed; a centrifugal dragon machine: arranged below the discharge port of the cyclone separator, and used to collect dust salt separated from the cyclone separator. The device solves the problem that dust impurities in the tail gas damage the heat exchanger during waste heat recovery.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery, and in particular to a heat recovery and utilization device for an edible salt factory. Background Art

[0002] In the production process of green edible salt, the traditional drying process usually uses hot air (such as hot air generated by coal-fired boiler heat exchangers or hot air from industrial hot air blowers) to dry the salt through a fluidized bed. The salt after centrifugal dehydration (moisture content is about 0.025g / 100g, and the semi-finished salt temperature is about 54°C) is dried from bottom to top in the fluidized bed by hot air. However, this drying method requires very high control of the boiler temperature. During normal production, the boiler temperature needs to be maintained at 230°C in winter and 180°C in summer.

[0003] The boiler heats up slowly in a cold furnace state, and it takes 35-40 minutes to reach the production requirements. In addition, the temperature is not easy to control during the production process, and the heating and cooling processes are fast, which makes it difficult for the boiler to maintain a constant temperature. This temperature instability can easily lead to dead bed phenomenon in the fluidized bed, and the salt products are easy to agglomerate in the fluidized bed, which brings greater operating difficulty and labor intensity to the operators. At the same time, the boiler coal consumption is high, and the production cost also increases accordingly.

[0004] The Chinese patent application number 202020377118.7 discloses a fluidized bed tail gas recycling device, comprising a fluidized bed, an air inlet duct and a tail gas duct connected to the fluidized bed, characterized in that: the tail gas duct is connected to the hot air furnace through a heat exchanger, and the hot air furnace is connected to the fluidized bed through a hot air duct; the heat exchanger is provided with an air inlet duct. The utility model can better recycle the waste heat in the tail gas, reduce energy consumption, and reduce production costs.

[0005] The above technology recovers the waste heat of the exhaust gas of the fluidized bed through a pipeline, thereby completing the reuse of heat energy. However, there may be particulate impurities in the exhaust gas. If the particulate impurities enter the heat exchanger together with the exhaust gas, it will affect the normal operation of the heat exchanger during operation. Therefore, a technology is now needed to remove dust from the exhaust gas during the waste heat recovery process. Summary of the invention

[0006] The present invention provides a heat recovery and utilization device for an edible salt factory, which can solve the problem that dust impurities in tail gas damage a heat exchanger during waste heat recovery.

[0007] In order to solve the above technical problems, the present application provides the following technical solutions: a heat recovery and utilization device for an edible salt factory, comprising:

[0008] Fluidized bed: a hot air inlet is provided at the bottom of the fluidized bed, and a hot air outlet is provided at the bottom of the fluidized bed;

[0009] Heat exchanger: used to heat the gas and continuously supply hot gas to the fluidized bed; the air outlet of the heat exchanger is connected to the hot air inlet through a heat transfer pipe;

[0010] Heat recovery pipe: One end of the heat recovery pipe is connected to the hot air outlet, and the other end is connected to the air inlet of the heat exchanger;

[0011] Dust collector: installed on the heat recovery pipe between the fluidized bed and the heat exchanger, used to absorb dust impurities in the heat recovery pipe;

[0012] Cyclone separator: It is installed on the heat recovery pipe near the hot air outlet to collect dust and salt brought out by the hot air from the fluidized bed;

[0013] Centrifugal auger: It is installed below the discharge port of the cyclone separator and is used to collect the dust and salt separated from the cyclone separator.

[0014] The basic principle and beneficial effects of this scheme: the fluidized bed is used to dry the salt products (dried by hot air from bottom to top in the fluidized bed). A cyclone separator is connected to the heat recovery pipe at the hot air outlet, which can collect the dust salt brought out by the hot air from the fluidized bed, and then transport it away through a centrifugal conveyor. The remaining hot air continues to move along the heat recovery pipe to the dust collector, and the dust collector further filters the impurities and dust remaining in the hot air. The filtered hot air continues to enter the heat exchanger along the heat recovery pipe, enters the air inlet of the heat exchanger, and is heated by the hot air, and then flows to the fluidized bed again, forming a hot air circulation.

[0015] This solution can transform the existing production equipment and processes, and use the fluidized bed to recover the hot air from the dried salt products. The waste heat originally discharged to the atmosphere is led to the air inlet of the boiler heat exchanger blower through a pipe. The heating time of the heat exchanger is shortened. In addition, after the technical transformation, the boiler temperature is maintained more constant and the cooling rate is also slowed down. At the same time, the addition of the dust collector reduces the impurity content in the heat recovery pipe, ensuring the safe use of the heat exchanger.

[0016] Furthermore, it also includes a cold air blower, which is matched with the fluidized bed and is used to cool down the salt product after hot air drying in the fluidized bed.

[0017] Beneficial effects: Conveniently and quickly cool down the dried salt products, improving production efficiency.

[0018] Furthermore, it also includes a dust collector induced draft fan, which is arranged on the heat recovery pipe between the dust collector and the heat exchanger and is used for directionally guiding the hot air coming out of the dust collector into the heat recovery pipe.

[0019] Beneficial effect: Improve the circulation of hot air.

[0020] Furthermore, it also includes a radiator blower, and the air inlet and air outlet of the radiator blower are respectively connected to the heat recovery pipe from the dust collector induced draft fan and the air inlet of the heat exchanger.

[0021] Furthermore, the heat exchanger is heated by a coal-fired boiler; it also includes a boiler blower, which is connected to the coal-fired boiler and is used to blow oxygen into the coal-fired boiler; the coal-fired boiler is also externally connected to a boiler induced draft fan, and the boiler induced draft fan is used to transmit the high-temperature gas generated by the combustion of the coal-fired boiler to the heat transfer tube.

[0022] Beneficial effect: The heat generated by combustion is fully utilized, saving energy.

[0023] Further, the dust removal box includes a base, a dust box is fixed on the base, a filter box is fixed on the dust box, a fixing plate is fixed between the dust box and the filter box, a dust removal air inlet is opened on the side of the dust removal box, and a dust removal air outlet is opened on the top of the dust removal box;

[0024] The dust removal air inlet is connected to an air delivery channel, which extends into the dust box. A slideway is provided at one end of the air delivery channel away from the dust removal air inlet, a slider is slidably connected in the slideway, a diaphragm is provided between the slideway and the air delivery channel, the diaphragm is made of elastic material, the diaphragm is fixedly connected to the slider, an induction sensor is installed at one end of the slideway away from the diaphragm, and an induction signal is sent when the slider passes by;

[0025] An upward channel is connected to the air delivery channel near the diaphragm side, and a three-way valve is connected to the top of the channel. The two outlets of the three-way valve are respectively connected to two cloth bags. A Y-shaped support fork is fixed at the bottom of the cloth bag, and a support rod is fixed at the bottom of the support fork. A rubber ring is fixed at the bottom of the support rod, and the outer ring of the rubber ring is fixedly connected to the fixing plate.

[0026] A dust collecting channel is provided at the bottom of the dust box, the support rod is hollow inside, and two air pipes are provided between the fixed plate and the dust collecting channel, and the air pipes are used to connect the hollow spaces in the two support rods and the dust collecting channel respectively; an electromagnetic valve is provided between the bottom of the cloth bag and the middle space in the support rod, and the electromagnetic valve is used to connect / close the connection between the cloth bag and the hollow space;

[0027] An air suction pipe is provided at one end of the integrated channel close to the slideway, and the other end of the air suction pipe is connected to the slideway. An exhaust port connected to the outside is also provided in the slideway, and the exhaust port is provided outside the dust box, and a one-way valve is provided on the exhaust port;

[0028] When the induction signal is generated, the three-way valve closes the currently connected outlet, opens another outlet, and opens the solenoid valve at the bottom of the original ventilation bag.

[0029] Beneficial effect: After the hot air enters the dust removal air inlet, it passes through the three-way valve and enters one of the bags. The impurities in the hot air are trapped by the bag, and the gas flows out from the sieve holes of the bag and flows to the heat recovery pipe through the dust removal outlet. When there are too many impurities, the gas is not easy to escape from the bag, and the pressure in the gas pipeline will increase, thereby impacting the diaphragm and pushing the slider to slide in the slideway. When it slides to the extreme position, the induction sensor is triggered and generates an induction signal to trigger the three-way valve to change the connection outlet, close the currently blocked bag connection, and open another unblocked bag connection. At this time, the newly connected bag continues to During the filtering of impurities, after the gas rushes to the new bag, the pressure on the diaphragm is reduced and returns to its original position, and the slider also returns to its original position. When the blocked bag is not working and is not ventilated, the solenoid valve below it is opened, and the impurities inside it fall into the dust collecting channel below through the hollow space in the middle of the support rod and are collected; when the slider slides from the initial position toward the inductive sensor, the gas in the slide is discharged through the exhaust port, and when the slider moves back to its original position, the gas in the dust collecting channel enters the slide through the suction pipe, generating suction in the dust collecting channel, thereby better sucking the impurities in the bag into the dust collecting channel.

[0030] Furthermore, the two outlets of the three-way valve are respectively connected to the first ventilation pipe and the second ventilation pipe, and the first ventilation pipe and the second ventilation pipe are respectively connected to two cloth bags; the first ventilation pipe and the second ventilation pipe are respectively connected to the bronchus, and the bronchus is made of elastic material, and the other end of the bronchus is connected to a knocking block, and the knocking block abuts against the support fork after the bronchus is inflated.

[0031] Beneficial effect: the knocking block knocks the supporting fork to generate vibration, which can shake the impurities in the bag and facilitate the collection of the impurities.

[0032] Furthermore, after being inflated, the bronchi on the first ventilation pipe and the second ventilation pipe respectively extend toward the supporting fork under the cloth bag connected to the second ventilation pipe and the first ventilation pipe.

[0033] Beneficial effect: when the first ventilation pipe is ventilated, the bronchial tube above it is inflated synchronously, knocking the supporting fork under another cloth bag to generate vibration, which facilitates impurities to pass through the hollow space in the support rod and enter the dust collection channel below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of a heat recovery and utilization device for a salt plant;

[0035] Figure 2 It is a three-dimensional schematic diagram of the dust removal box;

[0036] Figure 3 This is the main view of the dust removal box;

[0037] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0038] Figure 5 for Figure 4 A magnified schematic diagram of point B in the middle. DETAILED DESCRIPTION

[0039] The following is further described in detail through specific implementation methods:

[0040] The marks in the drawings of the specification include: base 1, filter box 2, dust box 3, dust removal air inlet 4, air supply duct 41, diaphragm 42, slider 43, induction sensor 44, exhaust port 45, air intake duct 46, dust removal air outlet 5, cloth bag 6, support fork 7, support rod 71, solenoid valve 72, dust collection box 78, dust collection channel 8, fixing plate 9, three-way valve 10, first ventilation pipe 101, second ventilation pipe 102, bronchial tube 103, and knocking block 104.

[0041] Embodiment 1 is as attached Figure 1 As shown,

[0042] Heat recovery and utilization device for edible salt factory, including:

[0043] Fluidized bed: a hot air inlet is provided at the bottom of the fluidized bed, and a hot air outlet is provided at the bottom of the fluidized bed; the cold air blower is matched with the fluidized bed to cool down the salt product after hot air drying in the fluidized bed.

[0044] Heat exchanger: used to heat the gas and continuously supply hot gas to the fluidized bed; the air outlet of the heat exchanger is connected to the hot air inlet through a heat transfer pipe; it also includes a radiator blower, the air inlet and air outlet of the radiator blower are respectively connected to the heat recovery pipe from the dust collector induced draft fan and the air inlet of the heat exchanger.

[0045] Heat recovery pipe: One end of the heat recovery pipe is connected to the hot air outlet, and the other end is connected to the air inlet of the heat exchanger; the heat exchanger is heated by a coal-fired boiler; it also includes a boiler blower, which is connected to the coal-fired boiler and is used to blow oxygen into the coal-fired boiler; the coal-fired boiler is also externally connected to a boiler induced draft fan, and the boiler induced draft fan is used to transmit the high-temperature gas generated by the combustion of the coal-fired boiler to the heat transfer pipe.

[0046] Dust collector: as attached Figure 2-5 As shown,

[0047] The dust box 3 comprises a base 1, a dust box 3 is fixed on the base 1, a filter box 2 is fixed on the dust box 3, a fixing plate 9 is fixed between the dust box 3 and the filter box 2, a dust inlet 4 is opened on the side of the dust box 3, and a dust outlet 5 is opened on the top of the dust box 3;

[0048] The dust removal air inlet 4 is connected to an air supply duct 41, and the air supply duct 41 extends into the dust box 3. A slide is provided at one end of the air supply duct 41 away from the dust removal air inlet 4, and a slider 43 is slidably connected in the slide. A diaphragm 42 is provided between the slide and the air supply duct 41. The diaphragm 42 is made of elastic material, and the diaphragm 42 is fixedly connected to the slide. An induction sensor 44 is installed at one end of the slide away from the diaphragm 42, and an induction signal is sent out when the slider 43 passes by; a reset spring is also fixed between the right end of the slider 43 and the slide. When the diaphragm is pressurized and the slider moves to the right limit position, the reset spring is compressed to the limit. When the pressure on the left side of the diaphragm is reduced, the reset spring is released to push the slider to move to the left until it returns to its original position.

[0049] An upward channel is connected to the air delivery channel 41 on the left side of the diaphragm 42, and a three-way valve 10 is connected to the top of the channel. The two outlets of the three-way valve 10 are respectively connected to two cloth bags 6. A Y-shaped support fork 7 is fixed to the bottom of the cloth bag 6, and a support rod 71 is fixed to the bottom of the support fork 7. A rubber ring is fixed to the bottom of the support rod 71, and the outer ring of the rubber ring is fixedly connected to the fixing plate 9; the support fork 7 is in the shape of a tuning fork, and the materials and parameters of the two support rods 71 ​​and the support fork 7 are consistent.

[0050] A dust collecting channel 8 is provided at the bottom of the dust box 3, the support rod 71 is hollow inside, and two air pipes are provided between the fixing plate 9 and the dust collecting channel 8, and the air pipes are used to connect the hollow spaces in the two support rods 71 ​​and the dust collecting channel 8 respectively; an electromagnetic valve 72 is provided between the bottom of the cloth bag 6 and the middle space in the support rod 71, and the electromagnetic valve 72 is used to connect / close the connection between the cloth bag 6 and the hollow space;

[0051] An air suction pipe 46 is provided at one end of the integrated channel close to the slide, and the other end of the air suction pipe 46 is connected to the slide. An exhaust port 45 connected to the outside is also provided in the slide. The exhaust port 45 is provided outside the dust box 3, and both the exhaust port 45 and the air suction pipe are provided with a one-way valve; the one-way valve of the exhaust port 45 controls the gas to pass only from the slide to the outside, and the one-way valve on the air suction pipe controls the gas to enter the slide only from the dust collecting channel 8.

[0052] When the sensing signal is generated, the three-way valve 10 closes the currently connected outlet, opens another connected outlet, and opens the solenoid valve 72 at the bottom of the original ventilation bag 6.

[0053] The two outlets of the three-way valve 10 are respectively connected to the first ventilation pipe 101 and the second ventilation pipe 102, and the first ventilation pipe 101 and the second ventilation pipe 102 are respectively connected to the two cloth bags 6; the first ventilation pipe 101 and the second ventilation pipe 102 are respectively connected to the bronchus 103, and the bronchus is made of elastic material, and the other end of the bronchus 103 is connected to the knocking block 104, and the knocking block 104 abuts against the support fork 7 after the bronchus 103 is inflated.

[0054] A downward dust collecting box 78 is provided on the right side of the dust collecting channel 8 for temporary storage of impurities, which can be replaced regularly after a certain amount is collected.

[0055] After the hot air enters from the dust removal air inlet 4, it enters one of the bags 6 through the connection of the three-way valve 10. The impurities in the hot air are trapped by the bag 6, and the gas flows out from the sieve holes of the bag 6 and flows to the heat recovery pipe through the dust removal outlet. When there are too many impurities, the gas is not easy to escape from the bag 6, causing the current bag 6 to be blocked, and the pressure in the gas pipeline will increase, thereby impacting the diaphragm 42 and pushing the slider 43 to slide in the slideway. When it slides to the extreme position, the induction sensor 44 is triggered to generate an induction signal to trigger the three-way valve 10 to change the connection outlet. After the connection outlet of the three-way valve 10 is changed, the currently blocked The blocked bag 6 stops taking in air, and the other bag 6 starts to ventilate; at this time, the newly connected bag 6 continues to filter impurities, and after the gas rushes to the new bag 6, the pressure on the diaphragm 42 is reduced and returns to its original position, and the slider 43 also returns to its original position. When the induction sensor 44 of the blocked bag 6 is triggered and a sensing signal is generated, the solenoid valve under the blocked bag 6 is synchronously opened. Here, the sensing signal of the sensing sensor is collected in real time by the data processing module, and then the data sensor synchronously sends a signal to control the three-way valve to change the air outlet, and a control signal to control the opening of the solenoid valve under the blocked bag. The impurities in the clogged bag fall into the dust collecting channel 8 below through the hollow space in the middle of the support rod 71 and are collected; when the slider 43 slides from the initial position toward the inductive sensor 44, the gas in the slide is discharged through the exhaust port 45, and when the slider 43 moves back to its original position, the gas in the dust collecting channel 8 enters the slide through the suction pipe, and suction is generated in the dust collecting channel 8, so that the impurities in the bag 6 are better sucked into the dust collecting channel 8. During the bronchial ventilation process, the knocking block 104 expands the bronchus and produces displacement deformation, so that the knocking block contacts the support fork, and the knocking block 104 knocks the support fork 7 to generate vibration. Since the two support forks are in the same state, the other support fork will generate the same frequency vibration under the action of the sound wave, so that the impurities in the bag 6 can be shaken, which is convenient for the collection of impurities. In the case of very small vibration, the impurities in the clogged bag will still fall into the dust collecting channel through the solenoid valve under the action of gravity. And after the blocked bag 6 stops ventilating, the other bag continues to ventilate. In this scheme, the gas filtered by the bag first escapes into the filter box, and then escapes from the dust removal outlet in the filter box. The escaped gas will also squeeze the blocked bag, so that the blocked bag is compressed and the impurities inside it are pressed into the dust collection channel.

[0056] Cyclone separator: It is installed on the heat recovery pipe near the hot air outlet to collect dust and salt brought out by the hot air from the fluidized bed;

[0057] Centrifugal auger: It is installed below the discharge port of the cyclone separator and is used to collect the dust and salt separated from the cyclone separator.

[0058] This solution uses a fluidized bed to recover hot air from drying salt products. The waste heat that was originally discharged to the atmosphere is led to the air inlet of the boiler heat exchanger blower through a pipe. Before the technical transformation, it took 35-40 minutes to heat up the cold furnace. After the technical transformation, the heating time was shortened to 25-30 minutes to meet the production temperature requirements. In addition, after the technical transformation, the boiler temperature is maintained more constant and the cooling rate is also slowed down.

[0059] After the technical transformation of this solution, the boiler temperature in the production process dropped from 180℃ to 115℃.

[0060] Coal consumption: The coal consumption for producing one ton of salt dropped from 23.44 kg to 12 kg, a reduction of 48.81%.

[0061] Semi-finished salt temperature: The temperature of semi-finished salt dropped from 54°C to 45°C, and the moisture content was controlled within the quality range, increasing from 0.025g / 100g to 0.59g / 100g, which is more in line with the temperature requirements of the packaging machine for packaged salt.

[0062] Labor intensity: The problem of salt product agglomeration in the fluidized bed during the production process has been improved, and the time for fluidized bed personnel to work has been extended from 60 minutes to 120 minutes. At the same time, the amount of coal added by the boiler operator to control the boiler temperature has been greatly reduced, and the number of coal additions has been reduced.

[0063] In summary, the recycling and utilization of hot air not only significantly reduces the coal consumption and production cost of the boiler, but also improves the production quality and stability of salt products, and effectively improves the controllability of the production process and the work efficiency of operators.

[0064] Embodiment 2

[0065] The difference between the second embodiment and the first embodiment is that the bronchial tubes 103 on the first ventilation tube 101 and the second ventilation tube 102 extend toward the support fork 7 under the cloth bag 6 connected to the second ventilation tube 102 and the first ventilation tube 101 after being inflated. When the first ventilation tube 101 is ventilated, the bronchial tube 103 above it is inflated synchronously, knocking the support fork 7 under another cloth bag, generating vibration, and facilitating impurities to pass through the hollow space in the support rod 71 and enter the dust collection channel 8 below. That is, the bronchial tube 103 on the left side will knock the support fork on the right side after being inflated, and the bronchial tube 103 on the right side will knock the support fork 7 on the left side after being inflated, thereby improving the efficiency of removing impurities.

[0066] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A heat recovery and utilization device for a salt plant, characterized in that: include: Fluidized bed: a hot air inlet is provided at the bottom of the fluidized bed, and a hot air outlet is provided at the bottom of the fluidized bed; Heat exchanger: used to heat the gas and continuously supply hot gas to the fluidized bed; the air outlet of the heat exchanger is connected to the hot air inlet through a heat transfer pipe; Heat recovery pipe: One end of the heat recovery pipe is connected to the hot air outlet, and the other end is connected to the air inlet of the heat exchanger; Dust collector: installed on the heat recovery pipe between the fluidized bed and the heat exchanger, used to absorb dust impurities in the heat recovery pipe; Cyclone separator: It is installed on the heat recovery pipe near the hot air outlet to collect dust and salt brought out by the hot air from the fluidized bed; Centrifugal auger: It is installed below the discharge port of the cyclone separator and is used to collect the dust and salt separated from the cyclone separator; The heat exchanger is heated by a coal-fired boiler; it also includes a boiler blower, which is connected to the coal-fired boiler and is used to blow oxygen into the coal-fired boiler; the coal-fired boiler is also externally connected to a boiler induced draft fan, which is used to transfer the high-temperature gas generated by the combustion of the coal-fired boiler to the heat transfer pipe; The dust collector comprises a base, a dust box is fixed on the base, a filter box is fixed on the dust box, a fixing plate is fixed between the dust box and the filter box, a dust removal air inlet is opened on the side of the dust box, and a dust removal air outlet is opened on the top of the dust collector; The dust removal air inlet is connected to an air delivery channel, which extends into the dust box. A slideway is provided at one end of the air delivery channel away from the dust removal air inlet, a slider is slidably connected in the slideway, a diaphragm is provided between the slideway and the air delivery channel, the diaphragm is made of elastic material, the diaphragm is fixedly connected to the slider, an induction sensor is installed at one end of the slideway away from the diaphragm, and an induction signal is sent when the slider passes by; An upward channel is connected to the air delivery channel near the diaphragm side, and a three-way valve is connected to the top of the channel. The two outlets of the three-way valve are respectively connected to two cloth bags. A Y-shaped support fork is fixed at the bottom of the cloth bag, and a support rod is fixed at the bottom of the support fork. A rubber ring is fixed at the bottom of the support rod, and the outer ring of the rubber ring is fixedly connected to the fixing plate. A dust collecting channel is provided at the bottom of the dust box, the support rod is hollow inside, and two air pipes are provided between the fixed plate and the dust collecting channel, and the air pipes are used to connect the hollow spaces in the two support rods and the dust collecting channel respectively; an electromagnetic valve is provided between the bottom of the cloth bag and the middle space in the support rod, and the electromagnetic valve is used to connect / close the connection between the cloth bag and the hollow space; An air suction pipe is provided at one end of the dust collecting channel close to the slideway, and the other end of the air suction pipe is connected to the slideway. An exhaust port connected to the outside is also provided in the slideway, and the exhaust port is provided outside the dust box. Both the exhaust port and the air suction pipe are provided with a one-way valve. When the induction signal is generated, the three-way valve closes the currently connected outlet, opens another outlet, and opens the solenoid valve at the bottom of the original ventilation bag.

2. The heat recovery and utilization device for edible salt factory according to claim 1, characterized in that: It also includes a cold air blower, which is matched with the fluidized bed and is used to cool down the salt product after hot air drying in the fluidized bed.

3. The heat recovery and utilization device for edible salt factory according to claim 1, characterized in that: It also includes a dust collector induced draft fan, which is arranged on the heat recovery pipe between the dust collector and the heat exchanger and is used for directionally guiding the hot air coming out of the dust collector into the heat recovery pipe.

4. The heat recovery and utilization device for edible salt factory according to claim 3 is characterized in that: It also includes a radiator blower, the air inlet and the air outlet of the radiator blower are respectively connected with the heat recovery pipe from the dust collector induced draft fan and the air inlet of the heat exchanger.

5. The heat recovery and utilization device for edible salt factory according to claim 1, characterized in that: The two outlets of the three-way valve are respectively connected to the first ventilation pipe and the second ventilation pipe, and the first ventilation pipe and the second ventilation pipe are respectively connected to two cloth bags; the first ventilation pipe and the second ventilation pipe are respectively connected to the bronchus, and the bronchus is made of elastic material, and the other end of the bronchus is connected to a knocking block, and the knocking block abuts against the support fork after the bronchus is inflated.

6. The heat recovery and utilization device for edible salt factory according to claim 5, characterized in that: After being inflated, the bronchi on the first ventilation tube and the second ventilation tube extend toward the supporting fork under the cloth bag connected to the second ventilation tube and the first ventilation tube respectively.

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