WO2019161713A1 - Sand thermal reclamation apparatus and control method and use method therefor - Google Patents

Abstract

A sand thermal reclamation apparatus, comprising a feeding device (2), a combustion chamber (1), a first-stage cooling device, a second-stage cooling device, a dust collecting device (15), a discharging device (13), and a waste warehouse. A control method for the sand thermal reclamation apparatus, comprising: a combustion chamber (1) continues working for 15 min after a vibrating sand feeder (2B) of a feeding device (2). A use method of the sand thermal reclamation apparatus.

Description

Sand heat regeneration device, control method and use method thereof

This application claims the priority of a Chinese patent application filed on February 24, 2018, the Chinese Patent Office, application number 201810155402.7, and the invention name is “sand heat regeneration equipment”, and requires the submission of Chinese patents on February 24, 2018. The priority of the Chinese Patent Application No. 201102257705.5, entitled "Sand-heating Regeneration Equipment", the entire contents of which are incorporated herein by reference.

Technical field

The invention relates to the field of casting sand regeneration technology, in particular to a sand heat regeneration device, a control method thereof and a use method thereof.

Background technique

With the global resource and environmental issues being upgraded to new heights and the implementation of green casting, how to effectively use resources and protect the environment has become the key to the benign development of the foundry industry. The foundry industry belongs to the basic industry of electricity, sand and metal. Among them, the foundry sand is furan resin sand, ceramsite sand, silica sand, etc., and the sand used belongs to fine sand grade. At present, the recycling of foundry sand has direct recovery of raw sand, cold reclaimed sand, thermal reclaimed sand, etc., and these sand recycling equipments are also high-power consumption equipment, how can energy consumption in the sand recycling process Low, and low dust is an urgent issue in energy, resources and environmental protection.

Summary of the invention

The object of the present invention is to solve some or all problems such as large energy consumption, waste of heat energy and dust pollution in the existing sand-heat regeneration process.

In order to solve the above problems, the present invention provides a sand thermal regeneration apparatus including a feeding device, a combustion chamber, a first stage cooling device, a second stage cooling device, a dust collecting device, and a discharge device. a device and a waste storage, one side of the feeding device being arranged near a wall of the factory, the combustion chamber being arranged on the other side of the feeding device, the feeding device and the combustion chamber passing through The other side of the combustion chamber is arranged with a first stage cooling device, the combustion chamber is in communication with the first stage cooling device through a sand outlet; the other side of the first stage cooling device a second stage cooling device is disposed, the two are connected through the sand outlet 2; the other side of the second stage cooling device is arranged with a discharging device, and the two are connected through the sand outlet 3; the dust collecting device and the The waste storage tank is disposed at the exit of the factory, and the combustion chamber, the first-stage cooling device, and the second-stage cooling device are respectively connected to the dust collecting device through a pipeline, and the waste storage tank passes through the pipeline The discharge device is in communication.

a sand thermal regeneration apparatus as described above, the feeding device comprising a storage hopper, a vibrating sand feeder and the feed port, the storage hopper being disposed on an overhead for storing old sand to be regenerated, The old sand outlet of the storage hopper is located directly above the vibrating sand feeder, and the vibrating sand feeding machine is in a horizontal direction, and the old sand filtered by the vibrating sand feeding machine passes through the feeding port to enter the In the combustion chamber.

a sand thermal regeneration device as described above, wherein the vibrating sand feeder is connected to the waste storage tank through a pipe, so that the old sand material that is not filtered into the combustion chamber and filtered by the vibrating sand feeding machine flows into the pipe through the pipe Describe the waste library.

The sand heat regeneration apparatus as described above, the feed apparatus further comprising a sand valve for adjusting a sand feed speed of the vibration sand feeder.

In the sand thermal regeneration device as described above, the old sand outlet is further provided with a screen for first filtering the old sand entering the vibrating sand feeder; and the screen is provided with a screen on the vibrating sand feeder, The old sand entering the combustion chamber is subjected to a second filtration.

a sand thermal regeneration apparatus as described above, the combustion chamber comprising a combustion chamber wall, a combustion device and an ignition device; the combustion device being located at a bottom of the interior of the combustion chamber, the combustion device being disposed at the bottom of the combustion chamber There are several groups that do not touch the combustion chamber wall; the ignition device is located on the combustion chamber wall.

In the sand thermal regeneration apparatus as described above, the combustion chamber wall is composed of a three-layer structure, which is an outer metal layer, an intermediate heat insulation layer and an inner protective layer, thereby effectively preventing heat loss in the combustion chamber.

a sand thermal regeneration apparatus as described above, the combustion apparatus comprising a combustion head, a power gas pipeline, a combustible gas pipeline, the combustion head passing through a coaxial cylindrical structural member, the power gas pipeline, and the combustible gas pipeline Connecting, thereby achieving mixing of the motive gas and the combustible gas inside the combustion head; and the combustion head, the motive gas conduit, and the combustible gas conduit are arranged in an upper and lower structure in the same vertical plane, wherein the combustion head In the uppermost layer, the power gas pipeline is at the lowermost layer, and an intake port of the power gas pipe and an intake port of the combustible gas pipe are taken out to the combustion chamber through the bottom of the combustion chamber, thereby realizing power Injection of gas and combustible gas; the sand thermal regeneration apparatus is provided with a plurality of sets of said combustion devices, each set of said combustion devices operating separately to enable control of the start and stop of any one of said combustion devices as desired.

In the sand thermal regeneration apparatus as described above, the combustion head includes a combustion portion, a combustible gas inlet portion, and a motive gas inlet portion, and the combustion portion communicates with the combustible gas conduit through the combustible gas inlet portion. The power gas inlet is also in communication with the power gas conduit.

In the sand thermal regeneration apparatus as described above, the lower end of each of the combustion portions is communicated with the lumen of a combustible gas conduit through a combustible gas inlet portion; and the lower end of each of the combustion portions is further passed through The power gas inlet portion is in communication with a lumen of the power gas conduit; and each of the combustible gas inlet portion and the corresponding power gas inlet portion are coaxial with a two-layer circular barrel.

In the sand thermal regeneration apparatus as described above, the vent hole at the top of the combustion head is further provided with a protective net for preventing the suspended sand particles from entering the combustion head to cause clogging.

a sand thermal regeneration apparatus as described above, said ignition means being divided into a primary igniter and a plurality of auxiliary igniters, said distribution of said ignition means being a corresponding set of said combustion means per igniter; said primary igniter Connected to the auxiliary igniter in series, and each of the auxiliary igniters can be individually turned off.

In the sand thermal regeneration apparatus as described above, the main igniter and the auxiliary igniter each extend into the combustion chamber through a passage provided on a side wall of the combustion chamber, and each igniter is further provided There is a flame ionization probe for detecting the combustion adequacy of each of the combustion devices.

In the sand thermal regeneration apparatus as described above, the first stage cooling device is a gas cooling device, and the bottom of the gas cooling device is provided with a plurality of sets of meandering S-shaped hollow pipes of a certain height, and the groups are twisted and twisted. The S-shaped hollow pipes are respectively concentrated outside the gas cooling device as a cooling gas inlet and a cooling gas outlet.

In the sand thermal regeneration apparatus as described above, the cooling gas outlet port communicates with the power gas inlet port, thereby preheating the motive gas entering the combustion chamber.

In the sand thermal regeneration apparatus as described above, the second stage cooling device is a liquid cooling device including a cooling tank and a liquid storage tank, the cooling tank and the liquid storage tank passing through a certain height The meandering S-shaped hollow pipe is connected, and the hollow pipe between the cooling box and the liquid storage tank is linear, and only the hollow pipe located in the cooling box and the liquid storage tank is a meandering S The valve is disposed on the straight pipe of the outer leakage portion to inject the medium into the meandering S-shaped hollow pipe through the valve.

The sand heat regeneration device as described above, wherein the discharge device is configured to receive reclaimed sand that has passed through cooling and dust removal, and the discharge device is further provided with a fine sieve that can vibrate freely for use in the regeneration process. The fine non-available sand that can not be reused is separated and discharged to the waste storage through the waste outlet; and the discharging device and the reclaimed sanding tank are connected through the discharge port to pass the qualified reclaimed sand through the screening. The discharge port 4 is conveyed to the reclaimed sand tank.

The sand thermal regeneration apparatus as described above, the dust collection device is an air suction type dust collection device for providing a negative pressure to the entire sand thermal regeneration device and for powering the movement of the suspended sand flow layer.

In the sand thermal regeneration apparatus as described above, the working principle of the combustion chamber is that the combustion chamber is continuously filled in the case of continuous feeding of the vibrating sand feeder, and the sand volume in the entire combustion chamber reaches the motive gas. After the bearing capacity, the suspended sand layer begins to enter the first-stage cooling device from the sand outlet under the action of negative pressure and gravity; when the vibration sanding machine stops the sand feeding, the suspended sand layer sand in the combustion chamber The amount is constant, under the action of the motive gas, there will be no more sand entering the first-stage cooling device from the sand outlet. This arrangement ensures that there is always sand in the combustion chamber, specifically, the vibration sander stops. The combustion chamber will continue to operate for 15 minutes after sanding, so that the sand entering the combustion chamber is sufficiently regenerated.

In the sand thermal regeneration apparatus as described above, the feeding device operates on the principle that the speed of the vibrating sand feeder in the feeding device is controlled by a pre-adjusted sand valve if the blanking speed of the storage hopper is too large Automatically closing the old sand outlet of the storage hopper; the old sand material filtered by the vibration sand feeder that cannot enter the combustion chamber flows into the waste storage tank for storing non-renewable sand through the pipeline; combined with the temperature inside the combustion chamber The temperature of each combustion zone fed back by the monitoring system is controlled to control the sand feeding speed of the vibrating sand feeder, thereby controlling the moving speed of the sand layer in the combustion chamber, thereby achieving full combustion regeneration of the old sand.

a sand thermal regeneration apparatus as described above, the sand thermal regeneration apparatus further comprising a controller and a temperature detecting system for detecting temperatures of respective combustion zones in the combustion chamber; the controller and the temperature detecting system communicating with each other And communicating with the sand valve of the feeding device to cause the controller to control the opening of the sand valve of the feeding device according to the temperature of each combustion zone in the combustion chamber to change the feeding a sanding speed of the vibrating sanding machine of the apparatus; the controller further in communication with a vibrating sand feeder of the feeding device and the combustion chamber, and the controller is configured to: when the vibration is 15 minutes after the sand feeding machine sends a stop sanding command, a stop work command is sent to the combustion chamber.

The sand thermal regeneration apparatus as described above, the controller and the remote control center communicate with each other to achieve remote control.

The sand-heat regeneration device of the invention realizes the closed-loop recycling of the old sand, and improves the problem of serious environmental pollution and serious waste of resources in the foundry industry.

In order to improve the thermal efficiency of the sand heat regeneration device, the power gas is used as a medium of the gas cooling device, so that the power gas is preheated, and the preheating can make the temperature of the power gas reach 500 ° C, thereby effectively improving The thermal efficiency of the combustion chamber. The motive gas is provided by a fan type product, and the pressure of the fan is preset by a pressure switch, so that the pressure of the motive gas is controllable. About 50% of the motive gas entering the combustion chamber is preheated by the gas cooling device.

By setting the dust collecting device, the unusable sand of each link directly enters the dust collecting device, and is not directly discharged into the environment, thereby avoiding sand pollution to the air and realizing the full recycling of the sand.

The present invention also provides a control method applicable to the sand-heat regeneration apparatus according to any one of the preceding claims, wherein the combustion chamber continues to operate for 15 minutes after the vibration of the feeding device stops sanding.

In the sand feeding method as described above, the opening degree of the sand valve of the feeding device is changed according to the temperature of each combustion zone in the combustion chamber to change the sand feeding speed of the vibration sanding machine.

The present invention also provides a method of using the sand thermal regeneration apparatus according to any of the above, comprising the steps of:

S001: Check the hardware connection of the sand-heat regeneration equipment and ensure that the connection ports and the opening and closing valves are closed;

S002: adding old sand which is crushed and stripped of metal impurities to the feeding device;

S003: After confirming that the electrical connection of the sand-heat regeneration equipment is secure, turn on the total power switch of the equipment to power on the equipment, and check whether the functional sections are normal and whether they are in the standby state through the total control platform;

S004: setting various process control parameters;

S005: Turn on the power gas control valve, the combustible gas control valve, and the ignition device of the combustion chamber to ignite, and when the temperature in the combustion chamber reaches the set working temperature, give a feed signal;

S006: after receiving the feed signal, start the feeding device to start adding old sand to the combustion chamber;

S007: The entire sand-heat regeneration equipment starts the regeneration, cooling and storage of the old sand according to the set control program.

DRAWINGS

Figure 1 is a schematic view showing the overall structure of a sand recycling apparatus.

Figure 2 is a schematic view of the structure of the combustion chamber.

Figure 3 is a schematic view of the structure of a group of combustion devices.

Figure 4 is a schematic view of the layout of the ignition device.

In the figure, 1-combustion chamber; 2-feeding device; 2A-storage hopper; 2B-vibration sanding machine; 2C-feeding port; 2D-old sand outlet; 3-insulation layer; 4-protective layer; Power gas pipeline; 5A-power gas inlet; 5B-external power gas pipeline; 5C-power gas connection port; 6-combustible gas pipeline; 6A-combustible gas inlet; 7-combustion device; 7A-burning head; 8- sand outlet; 8A- sand outlet one; 8B- sand outlet two; 8C- sand outlet three; 8D- sand outlet four; 9-cooling gas pipeline; 9A-cooling gas inlet; 9B- Cooling gas outlet; 10-dust port; 10A-pipe interface one; 10B-pipe interface two; 10C-pipe interface three; 11-gas cooling device; 12-liquid cooling device; 12A cooling box; 12B-liquid storage tank 12C-valve; 13-discharge device; 15-dust collector; 16-ignition device; 16A-master igniter; 16B-auxiliary igniter; 17-suspended sand layer.

Detailed ways

The sand thermal regeneration device provided by the invention comprises a feeding device, a combustion chamber, a first-stage cooling device, a second-stage cooling device, a dust collecting device, a discharging device and a waste storage, wherein the feeding device, the combustion chamber and the gas The cooling device, the liquid cooling device and the discharging device form a linear arrangement or a U-shaped arrangement or a circular arrangement, depending on the site, and the dust collecting device and the waste storage can be separately arranged, and the dust collecting device and the dust collecting device are The waste bin is configured at the factory's export attachment. According to the process production process, the feeding device is an initial device of the sand thermal regeneration device, in particular, one side of the feeding device is arranged near the wall of the factory, and the combustion is arranged on the other side. One side of the chamber is connected to the combustion chamber through a feed port, and the old sand to be regenerated is transported into the combustion chamber through the feed port; and the dust collecting device is connected above the combustion chamber a pipe interface one; a discharge port one is provided on the other side of the combustion chamber with respect to the feed port, the discharge port is connected to the combustion chamber and the gas cooling device; at the first stage The other side of the cooling device is provided with a discharge port 2, the discharge port 2 is connected to the gas cooling device and the second-stage cooling device; and the discharge port is provided on the other side of the second-stage cooling device Third, the discharge port three is connected to the second-stage cooling device and the discharging device; the first-stage cooling device and the liquid cooling device are provided with a pipe interface 2 and a pipe interface for connecting the dust collecting device Third, the dust collecting device passes through the pipeline and the combustion chamber, The first stage cooling device is connected to the second stage cooling device to realize secondary and tertiary dust removal in the dust removal and cooling process during the sand regeneration process to purify the available reclaimed sand.

The feeding device comprises a storage hopper, a vibrating sand feeder and a feed inlet. The storage hopper is used for storing old sand after crushing and removing metal impurities, and the dropping port under the storage hopper is located at one end of the vibrating sand feeding machine, thereby realizing the old sand to be sprinkled on the vibrating sand feeding machine; The other end of the vibrating sand feeding machine is connected to one end of the feeding port, and the vibrating sand feeding machine rescreens the old sand that is about to enter the combustion chamber, and removes the sand block which is not suitable for regeneration in the old sand, so as to make A large amount of regenerated sand enters the combustion chamber; the other end of the feed port is connected to the combustion chamber, so that the old sand smoothly enters the combustion chamber.

The combustion chamber includes a combustion chamber wall, a combustion device, and an ignition device. The combustion chamber wall (excluding the bottom surface) is provided with a metal outer layer, a heat insulating layer and a protective layer in order from the outside to the inside, and the metal outer layer is an integral structure of the combustion chamber, and functions as a support and a shape; The layer prevents the loss of internal heat on the one hand, and prevents the personnel from being inaccessible or even scalded by the overheating of the periphery of the combustion chamber on the other hand; the protective layer is used to protect the insulation layer and prevent the sand particles from entering the insulation layer, resulting in an insulation layer. Failure, increased equipment usage, reduced maintenance, maintenance intervals and costs. The combustion device is composed of a plurality of combustion plates, the combustion plate includes a combustible gas pipeline, a power gas pipeline and a combustion head, wherein the motive gas contains a combustion-supporting gas, and the combustible gas and the motive gas are in the Mixing the combustion heads together and injecting them into the combustion chamber from the gas injection holes of the combustion head, thereby achieving the purpose of blowing old sand particles falling from the feed port to form a sand flow layer, the combustion device being disposed at the In the central position of the bottom of the combustion chamber, the combustible gas inlet and the motive gas inlet are respectively taken out from the bottom of the combustion chamber. The ignition device is distributed on the side wall of the combustion chamber, and protrudes into the combustion chamber through a reserved passage on the side wall of the combustion chamber, and the ignition device is provided with a main igniter and a plurality of auxiliary igniters, The main igniter and the auxiliary igniter are in series relationship, the main igniter is provided with a sparking head, the ignition of the entire ignition device is achieved by igniting the main igniter, and the ignition device is always in the whole sand regeneration process Ignition status.

The first stage cooling device may be a gas cooling device. The gas cooling device is a plurality of sets of meandering S-shaped hollow pipes with a certain height inside, and the regenerated sand after the combustion regeneration is subjected to a first gas cooling, and the gas may be the power gas, It can be other gases that are not polluting the atmosphere. The plurality of sets of meandering S-shaped hollow pipes are drawn from the bottom or one side of the gas cooling device and assembled into an air inlet and an air outlet.

The second stage cooling device can be a liquid cooling device. The liquid cooling device comprises a cooling box and a liquid storage tank, wherein the cooling box is provided with a plurality of sets of meandering S-shaped hollow pipes, and correspondingly connected with a plurality of sets of meandering S-shaped hollows in the liquid storage tank a pipe, and a portion of the cooling tank and a corresponding portion of the liquid storage tank are a complete unit, and the whole cooling and twisting is due to the cooling tank and the liquid storage tank being two independent structures The hollow pipe is located at the outside of the two for connecting the two parts is a straight pipe, and a valve can also be added to the straight pipe for controlling the medium in the meandering pipe. A liquid for cooling the medium in the conduit is stored in the liquid storage tank. The liquid storage tank is provided with a liquid filling port at the top and a liquid discharging port at the bottom.

The discharging device is provided with a fine sieve which can vibrate freely, so as to remove the fine non-usable sand or sand which is burned and burned by the regeneration in the cooled reclaimed sand, and is discharged from the waste of the discharging device. The waste water discharged from it is discharged; the qualified reclaimed sand is sent to the reclaimed sand tank through the discharge port 4.

The dust collecting device is respectively connected with a pipe interface provided on the combustion chamber, a pipe interface 2 provided on the gas cooling device, and a pipe interface 3 provided on the cooling device of the liquid cooling device, and the dust in each box is connected by a pipe. Exhausting the flue gas in the combustion chamber, thereby realizing the removal of impurities in the reclaimed sand and protecting the environment, and the fine sand deposited in the dust collecting device and the sand discharged in the discharging device can be It is used to be added to the paint for reuse, so as to achieve full recycling of various materials in sand regeneration. The dust collecting device collects, extracts and absorbs the floating and sinking in the sand regeneration process by the negative pressure method, thereby realizing the reverse jet type dust collecting. The dust collecting device is provided with a recycling box for storing the collected floating sink.

The sand thermal regeneration apparatus of the present invention further includes a controller and a temperature detecting system for detecting temperatures of the combustion zones in the combustion chamber; the controller and the temperature detecting system communicate with each other, and the feeding The sand valves of the device communicate with each other such that the controller controls the opening of the sand valve of the feeding device according to the temperature of each combustion zone in the combustion chamber to change the vibration feeding of the feeding device Sanding speed of the machine; the controller is further in communication with the vibrating sand feeder of the feeding device and the combustion chamber, and the controller is configured to: stop sending sand to the vibrating sander 15 minutes after the command, a stop operation command is sent to the combustion chamber. Also, the controller can communicate with the remote control center for remote control.

The method for using the sand thermal regeneration device of the present invention is:

S001: Check the hardware connection of the sand-heat regeneration equipment and ensure that the connection ports and the opening and closing valves are closed;

S002: adding old sand which is crushed and stripped of metal impurities to the feeding device;

S003: After confirming that the electrical connection of the sand-heat regeneration device is secure, the total power switch of the device is powered on, and the main control platform checks whether the functional blocks are normal and whether they are in a standby state;

S004: setting various process control parameters;

S005: Turn on the power gas control valve, the flammable gas control valve and the ignition device to ignite, and when the temperature in the combustion chamber reaches the set working temperature, give a feed signal;

S006: after receiving the feed signal, start the feeding device to start adding old sand to the combustion chamber;

S007: The entire sand-heat regeneration equipment starts the regeneration, cooling and storage of the old sand according to the set control program.

Please refer to Figure 1 - Figure 4 for details.

In order to more clearly illustrate the technical solutions of the present invention, the detailed description will be made in accordance with the embodiments of FIGS. 1 to 4. It is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art, Other drawings may also be obtained from these drawings without paying for creative labor.

The sand thermal regeneration apparatus of the present embodiment includes a feeding device 2, a combustion chamber 1, a gas cooling device 11, a liquid cooling device 12, a dust collecting device 15, and a discharging device 13. From the layout of the entire sand thermal regeneration plant at the factory, the arrangement of the various functional units from the feeding device 2 to the discharge device 13 is such that the feeding device 2 comprises a storage hopper 2A located on the elevated platform, located at the storage The vibrating sand feeder 2B for the secondary screening of the old sand directly under the hopper 2A and the feeding port 2C at the outlet of the vibrating sander 2B, the vibrating sanding machine 2B and the combustion chamber 1 are in the same straight line Arranged in parallel, and the feeding device 2 is the starting position of the entire sand thermal regeneration device, the inlet 2C is in communication with the combustion chamber 1, and the old sand that needs to be regenerated enters the combustion chamber through the inlet 2C 1 performing regeneration; the dust collecting device 15 is connected to the combustion chamber 1, the gas cooling device 11 and the liquid cooling device 12 through a pipe interface 10A, a pipe interface 2B, and a pipe interface 3C, respectively, for suction sand regeneration. The floating dust that is not available in the process, because the dust collecting device 15 is connected with other equipment, it is possible to arrange the dust collecting device 15 in the place near the waste disposal in the factory to facilitate the treatment of the unavailable waste sand; Opposite the feed port 2C A discharge port 8A is disposed on one side of the discharge port, and one end of the discharge port 8A is in communication with the combustion chamber 1, and the other end is in communication with the gas cooling device 11, and the combustion chamber 1 and the gas cooling device 11 are in parallel on a straight line. Arranging; a side of the gas cooling device 11 away from the combustion chamber 1 is provided with a discharge port 2BB, one end of the discharge port 2B is connected with the gas cooling device 11, and the other end is connected with the liquid cooling device 12; The discharge side of the liquid cooling device 12 away from the gas cooling device 11 is provided with a discharge port 3C, which is connected to the liquid cooling device 12 at one end, and communicates with the discharge device 13 at the other end, and the discharge device A discharge port 4D is disposed on a side of the device 13 away from the liquid cooling device, and the discharge port 4D is connected to the regenerative sand reservoir.

The combustion chamber 1 is generally designed in the shape of a square box, and mainly comprises a combustion chamber wall, a plurality of combustion devices 7 and an ignition device 16. The illustrated combustion chamber wall is divided into a three-layer structure, a metal layer of the outermost layer, an insulating layer 3 of the intermediate layer, and a protective layer 4 of the innermost layer. The intermediate insulating layer 3 is made of a ceramic fiber material, and the protective layer is formed. 4 is made of heat insulation board, which has the effect of secondary insulation. The insulating layer 3 and the protective layer 4 do not relate to the bottom of the combustion chamber 1, and only the outermost metal layer is provided at the bottom of the combustion chamber 1. The protective layer 4 may be provided in addition to the remaining walls of the bottom of the combustion chamber 1, or may be provided only to the point where the suspended sand layer can reach, that is, half the height of the side wall of the combustion chamber 1. The combustion device 7 is located at the bottom of the entire combustion chamber 1, and the combustion device 7 includes a combustion head 7A, a power gas pipe 5, and a combustible gas pipe 6, and the power gas pipe 5 and the combustible gas pipe 6 are arranged one above the other. All of the combustible gas pipes and all of the power gas pipes extend in the same horizontal direction. The combustion head 7A is in the same plane above the combustible gas conduit 6, and the combustion head 7A is divided into a combustion portion, a combustible gas inlet portion, and a motive gas inlet portion. The combustion portion is a cylindrical cavity extending in the vertical direction, and the peripheral wall of the cylindrical cavity is provided with a plurality of exhaust holes. The combustible gas inlet portion is a round shaft tube, and the lower end of each combustion portion is connected to the pipe wall of a combustible gas pipe through a circular shaft cylinder, so that the lumen of the combustible gas pipe and the inner cavity of the combustion portion pass through the combustible gas. The gas is connected. The power gas inlet portion is also a round shaft tube, and the lower end of each combustion portion is connected to the tube wall of a combustible gas pipeline through a round shaft cylinder, so that the lumen of the power gas pipeline and the inner cavity of the combustion portion pass the motive gas The air inlet is connected. Moreover, the upper end of the combustible gas inlet portion penetrates through the corresponding combustible gas conduit and extends into the inner cavity of the corresponding motive gas inlet portion, so that the combustible gas inlet portion and the corresponding motive gas inlet portion are coaxial with each other. Layer round shaft tube. The combustion portion is evenly distributed on the combustible gas pipeline 6. In this embodiment, six combustion portions are disposed, and six combustion portions are arranged at intervals along the longitudinal direction of the combustible gas conduit 6, thereby realizing motive gas. Mixing with the combustible gas in the combustion section. The combustion device 7 is provided with a plurality of sets of interconnected motive gas ducts 5, combustible gas ducts 6 and combustion heads 7A arranged in one plane, the optimal configuration of which is to realize a matrix arrangement of the combustion devices 7. In order to facilitate ventilation, a power gas inlet port 5A and a combustible gas inlet port 6A leading to the outside of the combustion chamber 1 are respectively disposed on the upper power gas pipe 5 and the combustible gas pipe 6. At the same time, in order to increase the intake air amount of the motive gas, two intake ports may be opened on the power gas pipe 5 on the combustion device 7, and the two intake ports pass through the external motive gas disposed outside the combustion chamber 1. The duct 5B is connected, and the air source is supplied from the unified power gas inlet 5A. In order to further improve the heat utilization rate of the device, the power gas inlet 5A is forwardly disposed on the cooling gas inlet port 9A, that is, the power gas inlet port 5A is merged into the cooling gas inlet port 9A. Then, the outlet of the cooling gas is communicated with the power gas connection port 5C, thereby realizing the preheating of the power gas before entering the combustion chamber, which not only improves the working efficiency of the combustion chamber, but also effectively utilizes the residual heat of the reclaimed sand to achieve heat. Reuse. The ignition device 16 is divided into a main igniter 16A and an auxiliary igniter 16B, and the main igniter 16A and the auxiliary igniter 16B are in a series relationship, and the ignition device 16 is always in an ignition state during the operation of the combustion chamber 1, thereby The combustion device 7 is prevented from being buried by the suspended sand during operation of the combustion chamber 1; the main igniter 16A is disposed on the side wall of the combustion chamber 1, more specifically, the main igniter 16A is located at the feed port 2C. Above the group burning device 7, for igniting the combustion device 7 near the feed port 2C; the auxiliary igniter 16B in series with the main igniter 16A is arranged in one-to-one correspondence with the other groups of combustion devices 7 to maintain the other Each group of combustion devices 7 is always in a burning state without being buried by suspended sand; the ignition device 16 achieves full ignition of the overall ignition device 16 by igniting the main igniter 16A, and each auxiliary igniter 16B is provided. A separate closing switch, when the corresponding combustion device 7 is not operating, turns off the auxiliary igniter above the inoperative combustion device 7 prior to ignition. At the same time, each group of combustion devices 7 can be individually controlled to open and close, thereby optimizing the efficiency in the combustion chamber 1. When a certain group of combustion devices 7 does not need to work, the main combustion gas is not allowed to pass only the motive gas and does not open the group. The auxiliary igniter above the combustion device not only realizes the normal movement of the suspended sand layer, but also saves energy.

The first stage of cooling is set as the gas cooling device 11, and in order to maximize the cooling of the reclaimed sand, the gas pipe in the gas cooling device 11 is spiraled at the bottom of the entire device, and the suspended sand flow can travel along the spiral gas pipe. The spiral gas conduit may be an S-shaped sand flow path.

The second stage of cooling is provided as a liquid cooling device 12, and the arrangement of the same liquid cooling pipe is the same as that in the gas cooling device 11 in order to achieve the best cooling effect, thereby achieving the temperature of the reclaimed sand entering the discharge device 13. The set temperature is reached. The liquid cooling device 12 is divided into a cooling tank 12A for cooling the reclaimed sand and a liquid storage tank 12B for achieving heat exchange to ensure a part of the cooling duct in the cooling tank 12A. Can always be in a certain temperature range to achieve good cooling effect. In order to facilitate the replacement of the medium in the cooling duct in the liquid cooling device 12, a valve 12C may be provided on the cooling duct connecting the outer leakage portion of the cooling tank 12A and the liquid storage tank 12B.

More preferably, the old sand outlet 2D of the feeding device 2 can also be provided with a screen mesh to filter the old sand entering the vibrating sand feeding machine 2B for the first time to remove the larger block sand and reduce the vibration sand feeding machine. 2B's work load and reduce the equipment failure rate. The screen is used to reject small aggregated particles that cannot be regenerated from the old sand in the storage hopper 2A, and the small aggregated particles that are rejected are directly entered into the waste storage. In order to make the vibrating feeder 2B work smoothly, regular cleaning should be performed to prevent the screen from being clogged.

More preferably, both the main igniter 16A and the auxiliary igniter 16B of the ignition device 16 penetrate into the interior of the combustion chamber through a passage provided on the side wall of the combustion chamber 1 to protect the igniter from the impact of suspended sand for a long period of time.

More preferably, the ignition device 16 is further provided with a flame ionization probe to detect the sufficiency of combustion of each group of combustion devices 7, thereby ensuring the safety of the combustion chamber 1 and avoiding poisoning caused by incomplete combustion or Explosion risk.

More preferably, the gas injection hole of the combustion head 7A of the combustion device 7 may further be provided with a protective net for preventing the sand particles from entering the combustion head 7A, causing blockage of the combustion head 7A, affecting the efficiency and normal operation of the equipment.

More preferably, the combustion chamber 1 is divided into four regions, a first combustion zone, a second combustion zone, a third combustion zone and a fourth combustion zone, respectively, and the first sand enters the combustion chamber 1 from the feed port 2C. The combustion zone, under the action of the combustion gas stream and the subsequent addition of the old sand, causes the suspended sand flow layer 17 to move toward the second combustion zone, that is, the suspended sand flow layer 17 moves from the high concentration combustion zone to the low concentration combustion zone.

More preferably, the combustion chamber 1 is further provided with a temperature sensor 1 for monitoring the operating temperature in the combustion chamber 1 to ensure that the sand regeneration process can be performed in a certain temperature range, thereby avoiding burning loss when the temperature is too high. Or the regeneration is not complete and the regeneration time is long when the temperature is too low.

More preferably, the gas cooling device 11 and the cooling tank 12A of the liquid cooling device 12 are further provided with a heat insulating layer so that the temperature outside the gas cooling device 11 and the cooling box 12A is not excessively high to cause personal injury.

More preferably, the negative pressure required for the discharge port 8A, the discharge port 2 8B, the discharge port 3 8C, the discharge port 4 8D, and the waste outlet sand suction are all from the dust collecting device 15 , that is, The combustion chamber 1, the gas cooling device 11, the liquid cooling device 12 and the discharging device 13 are all in a negative pressure state, and the suspended sand flow layer 17 moves between the respective devices under a certain negative pressure and gravity; The discharge port 8A, the discharge port 2 8B, the discharge port 3 8C, the discharge port 4 8D and the waste outlet are respectively provided with electromagnetic valves to control the opening and closing of each discharge port.

More preferably, the combustible gas may be natural gas, liquefied petroleum gas, coal gas or the like.

More preferably, the motive gas may be compressed air, compressed oxygen or the like.

More preferably, the gas cooling device 11 and the cooling tank 12A of the liquid cooling device 12 are respectively provided with a temperature sensor 2 and a temperature sensor 3 for detecting the cooling device 12A of the gas cooling device 11 and the liquid cooling device 12 In the temperature of the sand, when the sand temperature reaches the set value, the sand 8 8B and the 8 8 sand outlet are opened.

More preferably, the discharging device 13 is further provided with a reclaimed sand position sensor and a waste sand position sensor for detecting the accumulated amount of reclaimed sand and waste sand in the discharging device, when the reclaimed sand and the waste sand are accumulated. When opening, the sand outlet 4D and the waste outlet are opened.

More preferably, an intake valve 1 is further disposed on the combustible gas inlet 6A, and the intake valve is a butterfly valve whose opening degree is controllable, thereby realizing control of the intake air amount.

More preferably, the power gas inlet 5A is provided with an intake valve 2, and the intake valve 2 is a butterfly valve whose opening degree is controllable, thereby realizing control of the intake air amount.

The feeding principle of the sand thermal regeneration device according to the embodiment: the speed of the vibration sanding machine 2B in the feeding device 2 is controlled by a pre-adjusted sand valve, and if the blanking speed of the storage hopper 2A is too large, Then, the old sand outlet 2D of the hopper 2A is automatically closed. The old sand material that is filtered out by the vibrating sand feeder 2B and cannot enter the combustion chamber 1 flows into the waste storage tank for storing non-renewable sand through the pipe. The sand feeding speed of the vibrating sand feeder 2B is controlled in combination with the temperature of each combustion zone fed back by the temperature monitoring system in the combustion chamber 1, thereby controlling the moving speed of the sand layer in the combustion chamber 1, thereby achieving full combustion regeneration of the old sand.

The working principle of the combustion chamber of the sand thermal regeneration device described in this embodiment:

The combustion chamber 1 is continuously filled in the case where the vibrating sand feeder 2B is continuously fed. When the sand volume in the entire combustion chamber 1 reaches the capacity of the motive gas, it starts to emerge under the action of negative pressure and gravity. The sand port 8A enters the gas cooling device 11. When the vibrating sand feeder 2B stops the sand feeding, the amount of sand of the suspended sand flow layer 17 in the combustion chamber 1 is constant, and no sand will enter the gas cooling device 11 from the sand outlet 8A under the action of the motive gas. The arrangement ensures that there is always sand in the combustion chamber 1 without exhausting the sand in the combustion chamber 1. Specifically, the combustion chamber 1 continues to work for 15 minutes after the vibrating sanding machine 2B stops sanding, thereby allowing combustion to enter. The sand of chamber 1 is fully regenerated.

The speed of the motive gas is determined by the workload of the combustion chamber 1. Under the premise of keeping the sand in a fluid state, it should also ensure that the suspension speed of the useful sand is not exceeded, thereby ensuring that the useful sand is not absorbed by the dust collecting device as a floating sink. .

The working temperature of the combustion chamber can generally be 400 ° C ~ 800 ° C, and the regeneration time is inversely proportional to the temperature, that is, the lower the temperature, the longer the old sand needs to stay in the combustion chamber, and the test proves that when the combustion chamber works When the temperature is 700 ° C, the time required for the regeneration of the old sand is 15 min, and the sanding temperature at the sand outlet is 700 ° C +/- 2 ° C. However, the operating temperature of 700 °C can only make the resin in the old sand into resin vapor, and can not decompose the resin into volatile non-polluting or small polluting atmospheric emission standards. In order to enable the working temperature in the combustion chamber to decompose the resin in the old sand into a harmless volatile gas, the required operating temperature is 900 ° C to 1000 ° C, and the present invention provides a PXG burning plate, which is 6*6 a matrix consisting of a combustion head, the power gas and the combustible gas respectively have different pipes entering the combustion head, mixed in the combustion head, and injected into the combustion chamber through the combustion head, so that the steam retention time in the combustion chamber is sufficient Full combustion of resin in old sand.

In order to prevent the sintering of the metal salt in the old sand during the combustion process, the anti-sintering additive is added to the old sand entering the combustion chamber, so that the metal salt becomes a stable form, thereby avoiding the regeneration process of the old sand. sintering.

The method for using the sand heat regeneration device of this embodiment is as follows:

S101: Checking the positional relationship between the storage hopper and the vibrating sand feeding machine in the feeding device of the sand heat regeneration device, checking whether the old sand outlet valve of the storage hopper is in a closed state, checking the connection between the feeding port and the vibrating sand feeding machine Is it smooth, check whether the screen on the vibrating sand feeding machine is cleaned, check whether the connection of the discharging port is tight and firm, check whether the connection of the discharging port 2 is tight and firm, and check whether the connection of the discharging port 3 is tight and firm, check Whether the connection of the discharge port 4 is tight and firm, check whether the connection of the waste outlet is tight and firm, and check the connection world of the dust collector is tight and firm;

S102: adding old sand which is crushed and stripped of metal impurities to a storage hopper of the feeding device;

S102: After confirming that the electrical connection of the sand-heat regeneration device is secure, the total power switch of the device is powered on, and the state of the temperature sensor in the combustion chamber is checked and set by the total control platform, and the state of the temperature sensor in the gas cooling device is checked. And setting and checking the status and setting of the temperature sensor in the liquid cooling device, checking the status and setting of the solenoid valve on the four discharge ports, checking the status and setting of the power gas intake valve, and checking the intake valve of the combustible gas. Status and setting, checking the status and setting of the position sensor in the discharge device to confirm that each functional area is normal and in a standby state;

S104: setting various process control parameters, such as setting the blanking amount of the storage hopper, the vibration frequency of the vibration sanding machine, the working temperature in the combustion chamber, the sanding temperature of the gas cooling device, the sanding temperature of the liquid cooling device, The position of the reclaimed sand, the location of the waste, the pressure of the suction in the combustion chamber, the suction pressure in the gas cooling device, the suction pressure in the liquid cooling device, the suction pressure of each sand outlet, the waste outlet pressure, etc.;

S105: Turn on the compressed air control valve, the flammable gas control valve and the ignition device to ignite, and when the temperature in the combustion chamber reaches the set working temperature, give a feeding signal;

S106: after receiving the feed signal, start the feeding device to start adding old sand to the combustion chamber;

S107: The entire sand thermal regeneration equipment starts the regeneration, cooling and storage of the old sand according to the set control program.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the claims of the present invention. The equivalent change is still within the scope of the invention.

Claims (25)

1. A sand thermal regeneration device, characterized in that the sand thermal regeneration device comprises a feeding device, a combustion chamber, a first-stage cooling device, a second-stage cooling device, a dust collecting device, a discharging device and a waste storage, One side of the feeding device is disposed near a wall of the factory, and the combustion chamber is disposed on the other side of the feeding device, and the feeding device is connected to the combustion chamber through a feeding port; The other side of the combustion chamber is arranged with a first stage cooling device, the combustion chamber is in communication with the first stage cooling device through a sand outlet; the other side of the first stage cooling device is arranged with a second stage a cooling device, the two are connected through the sand outlet 2; the other side of the second-stage cooling device is arranged with a discharging device, and the two are connected through the sand outlet 3; the dust collecting device and the waste storage are arranged nearby At the outlet of the factory, the combustion chamber, the first-stage cooling device, and the second-stage cooling device are respectively connected to the dust collecting device through a pipeline, and the waste storage tank passes through the pipeline and the discharging device Connected.
2. A sand thermal regeneration apparatus according to claim 1, wherein said feeding means comprises a storage hopper, a vibrating sand feeder and said feed port, said storage hopper being disposed on an overhead for storing needs Regenerated old sand, the old sand outlet of the storage hopper is located directly above the vibrating sand feeder, and the vibrating sand feeding machine is in a horizontal direction, and the old sand passing through the vibrating sand feeding machine is filtered The feed port enters the combustion chamber.
3. A sand thermal regeneration apparatus according to claim 2, wherein said vibrating sand feeder is connected to said waste storage tank through a pipe, so that said vibrating sand feeding machine screens out old ones that cannot enter said combustion chamber The sand flows into the waste reservoir through the pipe.
4. A sand thermal regeneration apparatus according to claim 2, wherein said feeding means further comprises a sand valve for adjusting a sand feeding speed of said vibrating sand feeder.
5. A sand-heat regeneration apparatus according to claim 2, wherein said old sand outlet is further provided with a screen for first filtering the old sand entering the vibrating sand feeder; A screen is placed on the machine to filter the old sand entering the combustion chamber for a second time.
6. A sand-thermal regeneration apparatus according to claim 1, wherein said combustion chamber includes a combustion chamber wall, a combustion device, and an ignition device; said combustion device being located at a bottom portion of said combustion chamber, said combustion device A plurality of sets are disposed at the bottom of the combustion chamber and are not in contact with the combustion chamber wall; the ignition device is located on the combustion chamber wall.
7. A sand thermal regeneration apparatus according to claim 6, wherein said combustion chamber wall is composed of a three-layer structure, which is an outer metal layer, an intermediate heat insulating layer and an inner protective layer, thereby effectively preventing combustion. Loss of heat in the room.
8. A sand thermal regeneration apparatus according to claim 6, wherein said combustion means comprises a combustion head, a power gas pipe, a combustible gas pipe, said combustion head passing said coaxial cylindrical structural member and said motive gas The pipeline and the combustible gas pipeline are connected to realize mixing of the motive gas and the combustible gas inside the combustion head; and the combustion head, the power gas pipeline, and the combustible gas pipeline are arranged in the same vertical plane a structure, wherein the combustion head is at an uppermost layer, the power gas pipe is at a lowermost layer, and an intake port of the power gas pipe and an intake port of the combustible gas pipe are led out through the bottom of the combustion chamber to Said outside the combustion chamber to achieve injection of a motive gas and a combustible gas; said sand thermal regeneration device is provided with a plurality of said combustion devices, each set of said combustion devices operating separately so as to be able to control any one of said combustions as needed Start and stop of the device.
9. The sand thermal regeneration apparatus according to claim 8, wherein the combustion head includes a combustion portion, a combustible gas intake portion, and a motive gas intake portion, and the combustion portion passes through the combustible gas intake portion and The combustible gas conduit is in communication and is further in communication with the motive gas conduit through the motive gas inlet.
10. A sand-thermal regeneration apparatus according to claim 9, wherein a lower end of each of said combustion portions is communicated with a lumen of said combustible gas conduit through a combustible gas inlet portion; and each of said a lower end of the combustion portion is further connected to a lumen of the power gas conduit through a power gas inlet portion; and each of the combustible gas inlet portion is coaxial with a corresponding one of the power gas inlet portions Two-layer round shaft tube.
11. A sand-thermal regeneration apparatus according to claim 8, wherein a venting opening is provided on the vent hole at the top of the burner to prevent the suspended sand particles from entering the combustion head to cause clogging.
12. A sand thermal regeneration apparatus according to claim 6, wherein said ignition means is divided into a main igniter and a plurality of auxiliary igniters, said ignition means being distributed for each igniter corresponding to said group of said combustion a device; the main igniter is connected in series with the auxiliary igniter, and each of the auxiliary igniters can be individually turned off.
13. A sand-thermal regeneration apparatus according to claim 12, wherein said main igniter and said auxiliary igniter each extend into said combustion chamber through a passage provided in a side wall of said combustion chamber, and A flame ionization probe is also provided on each igniter to detect the combustion adequacy of each of the combustion devices.
14. The sand-thermal regeneration apparatus according to claim 1, wherein the first-stage cooling device is a gas cooling device, and the bottom of the gas-cooling device is provided with a plurality of sets of meandering S-shaped hollow pipes of a certain height. The plurality of sets of meandering S-shaped hollow pipes are respectively concentrated outside the gas cooling device as a cooling gas inlet and a cooling gas outlet.
15. A sand thermal regeneration apparatus according to claim 14, wherein said cooling gas outlet port communicates with a power gas inlet port to thereby achieve preheating of the motive gas entering said combustion chamber.
16. A sand thermal regeneration apparatus according to claim 1, wherein said second stage cooling means is a liquid cooling means, said liquid cooling means comprising a cooling tank and a liquid storage tank, said cooling tank and said liquid The storage tank is connected by a meandering meandering S-shaped hollow pipe, and the hollow pipe between the cooling box and the liquid storage tank is linear, only in the cooling box and the liquid storage tank The hollow pipe is a meandering S-shaped shape, and a valve is arranged on the straight pipe of the outer leakage portion to inject the medium into the meandering S-shaped hollow pipe through the valve.
17. The sand-heat regeneration apparatus according to claim 1, wherein the discharge device is configured to receive reclaimed sand that has passed through cooling and dust removal, and the discharge device is further provided with a fine sieve that can vibrate freely. The utility model is used for separating fine non-available sand which cannot be reused due to the regeneration process, and discharging to the waste storage tank through the waste outlet; and the discharging device and the reclaimed sanding sand tank are connected through the discharge port to pass the screening. The reclaimed sand can be transported through the discharge port to the reclaimed sand tank.
18. The sand thermal regeneration apparatus according to any one of claims 1 to 17, wherein the dust collecting device is an air suction type dust collecting device for supplying a negative pressure to the entire sand thermal regeneration device and is used for The movement of the suspended sand layer provides power.
19. The sand-thermal regeneration apparatus according to any one of claims 1 to 17, wherein the working principle of the combustion chamber is: the combustion chamber is continuously filled while the vibrating sand feeder is continuously fed, After the sand volume in the combustion chamber reaches the capacity of the motive gas, the suspended sand layer begins to enter the first-stage cooling device from the sand outlet under the action of negative pressure and gravity; when the vibrating sand feeder stops the sand feeding When the amount of sand in the suspended sand flow layer in the combustion chamber is constant, no sand will enter the first-stage cooling device from the sand outlet under the action of the motive gas, and this arrangement ensures that the combustion chamber is always in the combustion chamber. There is sand, specifically, the combustion chamber will continue to operate for 15 minutes after the vibrating sand feeder stops sanding, so that the sand entering the combustion chamber is sufficiently regenerated.
20. A sand thermal regeneration apparatus according to any one of claims 1 to 17, wherein the feeding device operates on the principle that the speed of the vibrating sand feeder in the feeding device is adjusted by pre-adjusted sand. Valve control, if the blanking speed of the storage hopper is too large, the old sand outlet of the storage hopper is automatically closed; the old sand material filtered by the vibrating sand feeding machine that cannot enter the combustion chamber flows into the non-reclaimed sand through the pipeline The waste storage tank; controlling the sand feeding speed of the vibrating sand feeding machine in combination with the temperature of each combustion zone fed back by the temperature monitoring system in the combustion chamber, thereby controlling the moving speed of the sand flow layer in the combustion chamber, thereby achieving the old Full combustion regeneration of sand.
21. A sand thermal regeneration apparatus according to any one of claims 1 to 17, wherein said sand thermal regeneration apparatus further comprises a controller and a temperature detecting system for detecting the temperature of each combustion zone in said combustion chamber; The controller is in communication with the temperature sensing system and is further in communication with a sand valve of the feed device to cause the controller to control the feed device based on the temperature of each combustion zone within the combustion chamber An opening of the sand valve to change a sand feeding speed of the vibrating sand feeder of the feeding device; the controller further communicating with a vibrating sand feeder of the feeding device and the combustion chamber, and The controller is configured to send a stop work command to the combustion chamber 15 minutes after the stop sanding command is sent to the vibrating sander.
22. A sand thermal regeneration apparatus according to claim 21, wherein said controller and the remote control center communicate with each other to implement remote control.
23. A control method for a sand thermal regeneration apparatus according to any one of claims 1 to 22, characterized in that, after the vibrating sand feeder of the feeding device stops sanding, the combustion chamber continues to work 15 minute.
24. The sand feeding method according to claim 23, wherein the opening degree of the sand valve of the feeding device is changed according to the temperature of each combustion zone in the combustion chamber to change the vibration of the sanding machine Sand delivery speed.
25. A method of using the sand thermal regeneration apparatus according to any one of claims 1 to 22, characterized in that it comprises the following steps:

    S001: Check the hardware connection of the sand-heat regeneration equipment and ensure that the connection ports and the opening and closing valves are closed;

    S002: adding old sand which is crushed and stripped of metal impurities to the feeding device;

    S003: After confirming that the electrical connection of the sand-heat regeneration equipment is secure, turn on the total power switch of the equipment to power on the equipment, and check whether the functional sections are normal and whether they are in the standby state through the total control platform;

    S004: setting various process control parameters;

    S005: Turn on the power gas control valve, the combustible gas control valve, and the ignition device of the combustion chamber to ignite, and when the temperature in the combustion chamber reaches the set working temperature, give a feed signal;

    S006: after receiving the feed signal, start the feeding device to start adding old sand to the combustion chamber;

    S007: The entire sand-heat regeneration equipment starts the regeneration, cooling and storage of the old sand according to the set control program.

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