Regeneration coated sand roasting furnace

Abstract

The present invention relates to the technical field of energy-saving roasting of coated sand, and discloses a regenerative coated sand roasting furnace, comprising a main body, a combustion chamber is arranged in the main body, an igniter facing the combustion chamber is installed on the main body, and a feed chamber is fixed on one side of the main body, one side of the combustion chamber is connected to the feed chamber, and the side of the combustion chamber away from the feed chamber is connected to a preheating bag, and the preheating bag is connected to an exhaust pipe; a baffle is arranged in the feed chamber, and a preheating chamber connected to the exhaust pipe is opened in the side wall of the feed chamber; the preheating chamber is connected to the exhaust pipe. The present invention has a simple structure, and the waste gas discharged from the combustion chamber is sent into the feed chamber to preheat the sand particles. The sand particles with a certain temperature enter the combustion chamber, which can reduce the heat consumption in the combustion chamber, thereby reducing the use of natural gas and reducing the roasting cost of the sand particles.

Description

Technical Field

[0001] The invention relates to the technical field of energy-saving coating sand roasting, and specifically discloses a regenerative coating sand roasting furnace. Background Art

[0002] Coated sand is a molding sand or core sand with a layer of solid resin film on the surface of the sand particles. There are two preparation processes for coated sand: cold method and hot method. In the cold method, the resin is dissolved in ethanol, and hexamethylenetetramine is added during the sand mixing process so that the two are coated on the surface of the sand particles. The ethanol evaporates to obtain coated sand. In the hot method, the sand is roasted to a certain temperature, and the resin is added to melt it. The resin is coated on the surface of the sand particles by stirring, and an aqueous solution of hexamethylenetetramine and a lubricant are added. After cooling, crushing, and screening, coated sand is obtained. The main use of coated sand is for steel castings and iron castings.

[0003] When coated sand is prepared by thermal method, a roasting furnace is used to roast the sand particles. The sand particles are cold when entering the roasting furnace. The cold sand particles need to consume more heat from the roasting furnace to heat up from low temperature to high temperature. Therefore, the amount of natural gas consumed in the roasting furnace will increase, which will lead to an increase in the cost of roasting the sand particles. Summary of the invention

[0004] The present invention is intended to provide a regenerative coated sand roasting furnace to preheat the sand entering the roasting furnace, reduce the amount of natural gas consumed by the roasting furnace, and further reduce the cost of roasting the sand.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the present invention is as follows: a regenerative coated sand roasting furnace, comprising a main body, a combustion chamber is arranged in the main body, an igniter facing the combustion chamber is installed on the main body, and the feeding chamber is fixed on one side of the main body, one side of the combustion chamber is connected with the feeding chamber, and the side of the combustion chamber away from the feeding chamber is connected with a preheating bag, and the preheating bag is connected with an exhaust pipe; a deflection channel is arranged in the feeding chamber, and a preheating cavity connected with the exhaust pipe is opened in the side wall of the feeding chamber; the preheating cavity is connected with the exhaust pipe.

[0006] Principle and beneficial effects of the present invention: In this solution, when the combustion chamber roasts the sand particles, high-temperature exhaust gas will be generated. The exhaust gas is discharged into the preheating chamber through the exhaust pipe, which can preheat the sand particles in the feed chamber to increase the temperature of the sand particles, so that the sand particles enter the combustion chamber at a certain temperature. When the sand particles are heated, the heat consumption in the combustion chamber can be reduced, thereby reducing the use of natural gas in the combustion chamber and reducing the cost of roasting the sand particles. After the sand particles are roasted, they are discharged into the preheating bag for pre-storage, and the gas is discharged through the exhaust pipe to achieve the purpose of separating the exhaust gas from the sand particles.

[0007] In this solution, the sand particles flow in the deflector to the combustion chamber, and the deflector can slow down the flow speed of the sand particles, so that the sand particles have sufficient residence time in the feed chamber, and can fully exchange heat with the exhaust gas in the preheating chamber to ensure that the sand particles enter the combustion chamber at a certain temperature.

[0008] Furthermore, a preheating chamber is fixedly installed on one side of the main body away from the feed chamber, and the preheating chamber includes an upper preheating chamber and a lower preheating chamber located below the upper preheating chamber. The exhaust pipe runs through the upper preheating chamber, and the upper preheating chamber is connected to the lower preheating chamber. The upper preheating chamber is connected to an air pipe connected to the combustion chamber, and the lower preheating chamber is connected to a first fan.

[0009] Beneficial effect: The first fan delivers air to the lower preheating chamber, and then passes through the lower preheating chamber into the upper preheating chamber, and then enters the combustion chamber through the air pipe. In this solution, the preheating chamber is installed on the main body, and the high temperature in the combustion chamber will preheat the air in the lower preheating chamber for the first time. When the air enters the upper preheating chamber after being preheated, the exhaust gas in the exhaust pipe will exchange heat with the air in the upper preheating chamber, thus achieving the purpose of the second preheating. After the air is preheated, it enters the combustion chamber, which can further reduce the heat loss in the combustion chamber.

[0010] Furthermore, a preheating tube is fixed at the bottom of the preheating package, one end of the preheating tube is connected to the second fan, the other end of the preheating tube is connected to the igniter, the igniter is connected to the gas pipe, and the gas pipe is connected to the air pump.

[0011] Beneficial effects: The gas pump delivers natural gas to the igniter through the gas pipe, and the second fan delivers air to the igniter through the preheating pipe. Since the preheating bag stores the roasted sand particles, the sand particles will cover the preheating pipe, and the sand particles will preheat the air in the preheating pipe. The air entering the igniter has a certain temperature, which can heat the natural gas and reduce the energy consumption of natural gas ignition. At the same time, the preheated air can reduce the heat loss in the combustion chamber, achieving the purpose of energy saving.

[0012] Furthermore, the bottom of the combustion chamber is inclined, with a side close to the preheating package being lower and a side away from the preheating package being higher.

[0013] Beneficial effect: After the sand is roasted in the combustion chamber, it is necessary to discharge the sand into the preheating bag. The bottom of the combustion chamber is inclined to facilitate the flow of the sand and speed up the discharge of the sand.

[0014] Furthermore, baffles horizontally slidably connected to the combustion chamber are provided at the connection points between the combustion chamber and the feed chamber, and at the connection points between the combustion chamber and the preheating package.

[0015] Beneficial effects: According to the actual situation, the operator can use the baffle to partially or completely close the combustion chamber, reduce the heat loss in the combustion chamber, and improve the roasting effect of the sand particles.

[0016] Furthermore, a plurality of inspection windows are provided on the feed chamber, and each of the inspection windows is provided with a closing plate fixed on the feed chamber.

[0017] Beneficial effect: The condition in the feed chamber can be observed through the inspection window, so that the operator can inspect the components in the feed chamber. When not inspecting, the inspection window is closed by the closing plate to reduce the heat loss in the feed chamber.

[0018] Furthermore, a plurality of reinforcing plates are fixed on the outer side wall of the feed chamber, and the reinforcing plates are evenly distributed along the length direction of the feed chamber.

[0019] Beneficial effect: The feed chamber is reinforced by the reinforcing plate, thereby improving the strength of the feed chamber.

[0020] Furthermore, a plurality of air nozzles are fixed at the bottom of the combustion chamber, and the air nozzles are connected to the air pipes.

[0021] Beneficial effect: The air in the air pipe will be sent into the combustion chamber through the nozzle, and the gas ejected from the air nozzle will blow the sand particles in the combustion chamber, that is, the sand particles will vibrate in the combustion chamber to disperse the sand particles. The contact area between the dispersed sand particles and the flame in the combustion chamber is increased, thereby improving the roasting efficiency of the sand particles, accelerating the roasting of the sand particles, reducing the heat consumption in the combustion chamber, and achieving the purpose of energy saving.

[0022] Furthermore, the deflector is composed of a plurality of feed plates arranged on the two side walls of the feed chamber, the feed plates on both sides are arranged alternately along the length direction of the feed chamber, and the feed plates are inclined toward the middle of the feed chamber.

[0023] Beneficial effect: The sand particles flow in the feed chamber along the feed plates to achieve the purpose of guidance, and because the feed plates are staggered to form a deflection channel, the flow path of the sand particles is extended, thereby increasing the time the sand particles stay in the feed chamber, so that the sand particles can fully exchange heat with the exhaust gas in the preheating chamber, thereby improving the preheating effect of the sand particles.

[0024] Furthermore, the connection point between the preheating chamber and the exhaust pipe is located at the upper part of the preheating chamber, and the lower part of the preheating chamber is connected to the exhaust pipe.

[0025] Beneficial effect: The exhaust gas enters the preheating chamber, flows from the upper part to the lower part, and is then discharged from the exhaust pipe, so that the exhaust gas can completely wrap the feed chamber and extend the flow time of the exhaust gas, so that the sand particles in the feed chamber can be fully preheated. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an axonometric diagram of the regenerative coated sand roasting furnace in Example 1 of the present invention;

[0027] Figure 2It is a top view of the regenerative coated sand roasting furnace in the first embodiment of the present invention;

[0028] Figure 3 It is a front view of the regenerative coated sand roasting furnace in the first embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the igniter in the first embodiment of the present invention;

[0030] Figure 5 for Figure 3 A cross-sectional view of

[0031] Figure 6 It is a cross-sectional view of the regenerative coated sand roasting furnace in the second embodiment of the present invention;

[0032] Figure 7 for Figure 6 Enlarged view of part B. DETAILED DESCRIPTION

[0033] The following is further described in detail through specific implementation methods:

[0034] The figure marks in the drawings of the specification include: main body 1, combustion chamber 11, air nozzle 12, baffle 13, preheating chamber 2, first fan 21, second fan 22, connecting pipe 23, air pipe 24, upper preheating chamber 25, lower preheating chamber 26, feed chamber 3, feed plate 31, cavity 311, air hole 312, air plate 313, spring 314, closing plate 32, reinforcing plate 33, preheating chamber 34, igniter 4, air box 41, ignition nozzle 42, air hole 43, preheating bag 5, exhaust pipe 51, preheating pipe 61, gas pipe 62.

[0035] Embodiment 1:

[0036] Basically as attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 and attached Figure 5 As shown: a regenerative coated sand roasting furnace includes a frame, a main body 1 is fixed on the frame, a feed chamber 3 is bolted to one side of the main body 1, and a preheating chamber 2 is bolted to the other side of the main body 1.

[0037] In this embodiment, the upper and lower parts of the feed chamber 3 are both opened, and a plurality of feed plates 31 are bolted to the side walls on both sides of the feed chamber 3, and the feed plates 31 on both sides are arranged alternately along the length direction of the feed chamber 3, and the feed plates 31 are inclined toward the middle of the feed chamber 3, and the arrangement of the feed plates 31 can form a baffle for sand particles to pass through. A plurality of reinforcing plates 33 are bolted to the outer side walls of the feed chamber 3, and the reinforcing plates 33 are evenly distributed along the length direction of the feed chamber 3.

[0038] A preheating chamber 34 is provided in the side wall of the feed chamber 3, a connecting hole is provided in the upper part of the preheating chamber 34, and an exhaust pipe is connected to the lower part of the preheating chamber 34. A plurality of inspection windows are provided on the feed chamber 3, and a closing plate 32 for closing the inspection windows is bolted to the feed chamber 3. The preheating chamber 2 includes an upper preheating chamber 25 and a lower preheating chamber 26 located below the upper preheating chamber 25, and a connecting pipe 23 is connected between the upper preheating chamber 25 and the lower preheating chamber 26.

[0039] The main body 1 has a combustion chamber 11 in it. One side of the combustion chamber 11 is connected to the feed chamber 3, and the other side of the combustion chamber 11 is connected to the preheating bag 5. The connection points between the combustion chamber 11 and the feed chamber 3 and the connection points between the combustion chamber 11 and the preheating bag 5 are horizontally slidably connected with baffles 13. The bottom of the combustion chamber 11 is inclined, and the side close to the preheating bag 5 is lower, and the side away from the preheating bag 5 is higher. A number of air nozzles 12 are bolted to the bottom of the combustion chamber 11, and an igniter 4 is bolted to the combustion chamber 11. When no roasting is performed in the combustion chamber 11, the combustion chamber 11 is closed by the baffle 13 to ensure the temperature in the combustion chamber 11 and reduce the loss of heat energy. When sand is fed into the combustion chamber 11, the attached Figure 5 The baffle plate 13 on the left side shown is opened to facilitate the feeding of sand grains. When roasting sand grains, the baffle plate 13 on the right side is opened again, and the baffle plate 13 on the left side is closed.

[0040] The first fan 21 and the second fan 22 are bolted to the frame. The air outlet of the first fan 21 is connected to a pipeline, which is connected to the lower preheating chamber 26. The upper preheating chamber 25 is connected to an air pipe 24 connected to the air nozzle 12. The second fan 22 is connected to a preheating pipe 61, which is bolted to the bottom of the preheating bag 5 and passes through the preheating bag 5. The preheating pipe 61 is connected to the igniter 4. Figure 4 As shown, the igniter in this embodiment includes a hollow gas box 41, which is connected to a preheating tube 61. An ignition nozzle 42 facing the middle of the combustion chamber 11 is bolted to the gas box 41. The ignition nozzle 42 is connected to a gas pipe 62 that runs through the gas box 41. The gas pipe 62 is connected to an air pump (not shown in the figure). The gas box 41 is provided with a plurality of air holes 43 located on the periphery of the ignition nozzle 42.

[0041] The preheating bag 5 is a hollow box, and the upper part of the box is connected with an exhaust pipe 51. The exhaust pipe 51 passes through the upper preheating chamber 25 and is connected with the preheating cavity 34 through a connecting hole.

[0042] When implementing:

[0043] The roasting process of sand grains: the sand grains enter the combustion chamber 11. Since the feed plates 31 in the feed chamber 3 are arranged in a staggered manner and tilted, the sand grains can not only flow downward under the action of the sand grains themselves, but also slow down the flow speed of the sand grains, and enter the combustion chamber 11 at a relatively slow speed. After the sand grains enter the combustion chamber 11, the sand grains are roasted. At this time, the connection between the combustion chamber 11 and the feed chamber 3 can be closed by the baffle 13 to reduce the heat loss in the combustion chamber 11. After the sand grains are roasted, the sand grains slide into the preheating bag 5 along the bottom of the combustion chamber 11 under the action of their own gravity. Of course, the sand grains can also be manually fed into the preheating bag 5.

[0044] Waste heat utilization process: When the sand is discharged into the preheating bag 5, the sand and the waste gas are separated, and the waste gas enters the waste pipe 51. Since the waste pipe 51 runs through the upper preheating chamber 25, it will exchange heat with the air in the upper preheating chamber 25. At the same time, the waste gas in the waste pipe 51 will enter the preheating chamber 34 and flow from top to bottom until it is discharged from the exhaust pipe. When the waste gas is in the preheating chamber 34, since the sand flows slowly in the feed chamber 3 and the waste gas is discharged from top to bottom, the waste gas can fully exchange heat with the sand, thereby achieving the purpose of preheating the sand.

[0045] The first fan 21 delivers air to the lower preheating chamber 26. Since the preheating chamber 2 is installed on the body 1, the heat of the body 1 itself (the heat in the combustion chamber) will preheat the air in the lower preheating chamber 26 for the first time. Under the action of the first fan 21, the air will also enter the upper preheating chamber 25, and the exhaust pipe 51 will preheat the air for the second time, thus preheating the air twice. The air is ejected from the air nozzle 12 through the air pipe 24, causing the sand in the combustion chamber 11 to vibrate, thereby increasing the contact area between the sand and the flame, thereby improving the roasting effect of the sand.

[0046] The second fan 22 delivers air into the air box 41 through the preheating pipe 61, and at the same time, the air pump delivers natural gas into the ignition nozzle 42. The preheating pipe 61 is fixed to the bottom of the preheating bag 5, and the sand particles with high temperature after roasting will preheat the air in the preheating pipe 61, and the preheated air will be ejected from the air hole 43. At the same time, the air will preheat the natural gas in the natural gas pipe, reducing the energy consumption of natural gas ignition. At the same time, the preheated air enters the combustion chamber 11 to keep the combustion chamber 11 warm and reduce the heat loss in the combustion chamber 11.

[0047] In this embodiment, the waste gas and the residual heat of the combustion chamber 11 are used to preheat the sand and air, which can reduce the heat loss in the combustion chamber 11 and reduce the use of natural gas, thereby achieving the purpose of energy saving and environmental protection.

[0048] Embodiment 2:

[0049] The difference between the second embodiment and the first embodiment is that, as shown in the attached Figure 6 and attached Figure 7 As shown, a cavity 311 is provided in the feed plate 31, and the cavity 311 is connected to a plurality of air holes 312 evenly distributed on the feed plate 31, and air plates 313 are arranged in the air holes 312, and the air plates 313 are arranged obliquely, and one end of the air plate 313 close to the upper surface of the feed plate 31 is higher than the other end of the air plate 313 away from the upper surface of the feed plate 31, and a spring 314 is arranged at the bottom of the air plate 313, one end of the spring 314 is fixed on the feed plate 31, and the other end of the spring 314 is fixed on the air plate 313, and a plurality of air holes are provided on the air plate 313, and the diameter of the air holes is smaller than the diameter of the sand particles. The cavity 311 is connected to a hose, and the hose is connected to an air pump.

[0050] The specific implementation process is as follows:

[0051] When the sand particles flow on the feed plate 31, the operator turns on the air pump, and the air pump sends gas into the air cavity, and the gas is discharged through the air holes to blow the sand particles, so that the sand particles oscillate on the feed plate 31, and at the same time, the sand particles are blocked. The vibration of the sand particles can expand the contact area between the sand particles and the hot air in the feed chamber 3, thereby improving the heat exchange between the sand particles and the exhaust gas. The blocking of the sand particles by the gas can extend the flow time of the sand particles, further increasing the heat exchange time between the exhaust gas and the sand particles.

[0052] Initially, the gas plate 313 is attached Figure 7 In the state shown, when the sand particles block the air hole, the air pressure in the cavity 311 will increase, so that the gas in the cavity 311 will push the air plate 313 to rotate, and the upper surface of the air plate 313 is flush with the upper surface of the feed plate 31, and the sand particles on the air plate 313 are carried away by other flowing sand particles. Of course, the gas blown toward the air hole can also blow away the sand particles on the air hole. After the sand particles on the air hole are carried away, the air hole is exposed. After the air pressure in the cavity 311 decreases, the air plate 313 is pulled to reset under the action of the spring 314.

[0053] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and / or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection 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 interpret the content of the claims.

Claims

1. A regenerative coated sand roasting furnace, comprising a main body, a combustion chamber is arranged in the main body, an igniter facing the combustion chamber is installed on the main body, and the characteristics are: It includes a feed chamber fixed on one side of the body, one side of the combustion chamber is connected to the feed chamber, the side of the combustion chamber away from the feed chamber is connected to a preheating bag, and the preheating bag is connected to an exhaust pipe; a baffle is arranged in the feed chamber, and a preheating cavity connected to the exhaust pipe is opened in the side wall of the feed chamber; the preheating cavity is connected to the exhaust pipe; the baffle is composed of a plurality of feed plates arranged on the two side walls of the feed chamber, the feed plates on both sides are staggered along the length direction of the feed chamber, and the feed plates are inclined toward the middle of the feed chamber; a cavity is opened in the feed plate, and the cavity is connected to a plurality of air holes evenly distributed on the feed plate, and air plates are arranged in the air holes, and the air plates are inclined. One end of the air plate close to the upper surface of the feed plate is higher than the end of the air plate away from the upper surface of the feed plate, a spring is arranged at the bottom of the air plate, one end of the spring is fixed on the feed plate, and the other end of the spring is fixed on the air plate, a plurality of air holes are opened on the air plate, and the diameter of the air holes is smaller than the diameter of the sand particles; the cavity is connected with a hose, and the hose is connected with an air pump; a preheating chamber is fixedly installed on one side of the body away from the feed chamber, the preheating chamber comprises an upper preheating chamber and a lower preheating chamber located below the upper preheating chamber, the exhaust pipe runs through the upper preheating chamber, the upper preheating chamber is connected with the lower preheating chamber, the upper preheating chamber is connected with an air pipe connected with the combustion chamber, and the lower preheating chamber is connected with a first fan.

2. The regenerative coated sand roasting furnace according to claim 1, characterized in that: A preheating tube is fixed at the bottom of the preheating package, one end of the preheating tube is connected to a second fan, the other end of the preheating tube is connected to an igniter, the igniter is connected to a gas pipe, and the gas pipe is connected to an air pump.

3. The regenerative coated sand roasting furnace according to claim 2 is characterized in that: The bottom of the combustion chamber is inclined, with a side close to the preheating package being lower and a side away from the preheating package being higher.

4. The regenerative coated sand roasting furnace according to claim 3 is characterized in that: The connecting point between the combustion chamber and the feeding chamber, and the connecting point between the combustion chamber and the preheating bag are both provided with baffles which are horizontally slidably connected with the combustion chamber.

5. The regenerative coated sand roasting furnace according to claim 4, characterized in that: A plurality of inspection windows are provided on the feed chamber, and each inspection window is provided with a closing plate fixed on the feed chamber.

6. The regenerative coated sand roasting furnace according to claim 5, characterized in that: A plurality of reinforcing plates are fixed on the outer side wall of the feed chamber, and the reinforcing plates are evenly distributed along the length direction of the feed chamber.

7. The regenerative coated sand roasting furnace according to claim 6, characterized in that: A plurality of air nozzles are fixed at the bottom of the combustion chamber, and the air nozzles are communicated with the air pipes.

8. The regenerative coated sand roasting furnace according to claim 7, characterized in that: The connection point between the preheating chamber and the exhaust pipe is located at the upper part of the preheating chamber, and the lower part of the preheating chamber is connected with the exhaust pipe.

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