Explosion-proof rotary furnace and control method thereof

Abstract

The present application relates to the technical field of rotary furnace, and particularly relates to an explosion-proof rotary furnace and a control method thereof. The explosion-proof rotary furnace comprises an explosion-proof rotary furnace, a circulating pipeline, an inert gas storage tank, a pressure relief mechanism, a filtering mechanism, a first monitoring part, a second monitoring part, a third monitoring part and a fourth monitoring part. The first monitoring part, the second monitoring part, the third monitoring part and the fourth monitoring part are respectively used for monitoring the concentration and pressure of the gas on the side of the filtering mechanism away from the outlet end of the baking chamber, the concentration and pressure of the gas at the position of the first pipeline, the concentration and pressure of the gas at the position of the second pipeline and the concentration of the gas on the side of the filtering mechanism close to the outlet end of the baking chamber. The present application can realize real-time and accurate explosion prevention and suppression of different baked foods and different models of explosion-proof rotary furnaces by monitoring the concentration and pressure of the gas in the explosion-proof rotary furnace, supplementing inert gas into the explosion-proof rotary furnace or releasing the mixed gas in the explosion-proof rotary furnace.

Description

Technical Field

[0001] This invention relates to the field of rotary furnace technology, and in particular to an explosion-proof rotary furnace and its control method. Background Technology

[0002] Rotary oven baking equipment refers to equipment that uses various energy sources (such as electricity, diesel, natural gas, etc.) to heat the combustion chamber, and then sends hot air into the furnace through a heat exchanger and a fan to bake the items inside the furnace. It is widely used in the food, agriculture, chemical and other fields.

[0003] Existing heating methods for food baking rotary ovens include:

[0004] 1. Using heated air: Heating and baking are carried out by direct contact between hot air and food;

[0005] 2. Using radiant elements: heating and baking are achieved through direct contact between radiant waves and the food.

[0006] 3. Heating and baking are carried out by combining heated air with radiant heat exchange;

[0007] Among these heating methods, the main mechanism of action is to heat food from the outside to the inside through heat conduction, convection heat transfer and radiation heat transfer (although radiation heat transfer can achieve heating from the inside to the outside, the depth of radiation wave penetration is very small, and the food is still mainly heated from the outside to the inside).

[0008] The following explosion risks are typically present during the baking process in a rotary oven:

[0009] 1. Under the heating mechanism of the rotary oven baking food described above, for foods containing a large amount of gas inside (such as mooncakes and bread with fillings), since it is impossible to prevent the gas inside from expanding, there is a risk of explosion due to the rapid expansion of gas during the food baking process.

[0010] 2. The heating process of food is a complex physicochemical process. During the baking process of food in a rotary oven, the food will release a large amount of water vapor and generate or volatilize dust particles, combustible or non-combustible gases. As for the internal structure of the rotary oven, it has a relatively independent baking chamber with excellent sealing performance. Once the air, water vapor, dust particles, combustible or non-combustible gases in the oven accumulate to a certain amount, the pressure in the baking chamber will gradually increase, which may lead to the risk of explosion due to excessive pressure.

[0011] 3. When the flammable gases and dust generated or volatilized during the food baking process reach a certain concentration, and the temperature inside the oven rises to the baking temperature, the temperature of the entire baking chamber is very high. Especially in rotary ovens that use fuel, the temperature of the gas outside the combustion chamber can reach over 800 degrees Celsius. When flammable gases and dust pass through, dangerous situations such as deflagration and explosion can easily occur. Summary of the Invention

[0012] To address the shortcomings of existing production technologies, the applicant provides an explosion-proof rotary furnace and its control method. Through improvements to the explosion-proof method of the explosion-proof rotary furnace, real-time and precise explosion prevention and suppression are achieved.

[0013] The technical solution adopted in this invention is as follows:

[0014] An explosion-proof rotary oven includes: an explosion-proof rotary oven, a circulation pipeline, an inert gas storage tank, a pressure relief mechanism, a filtration mechanism, a first monitoring unit, a second monitoring unit, a third monitoring unit, and a fourth monitoring unit. The explosion-proof rotary oven has a baking chamber for baking food. The circulation pipeline includes a first pipeline and a second pipeline. One end of the first pipeline is connected to the second pipeline, and the other end of the first pipeline is connected to the outlet of the baking chamber. The other end of the second pipeline is connected to the inlet of the baking chamber. The inert gas storage tank is connected to the explosion-proof rotary oven. A nozzle is provided on one side of the inert gas storage tank. The nozzle is located inside the first pipeline and is connected to the inert gas storage tank through a first connecting pipe. An electric regulating valve is connected in series on the first connecting pipe. The pressure relief mechanism includes a pressure relief pipe and a pressure relief valve. The pressure relief pipe passes through the explosion-proof rotary oven. The rotary furnace is equipped with a pressure relief pipe connected to the second pipe. The pressure relief valve is located outside the explosion-proof rotary furnace and connected in series with the pressure relief pipe. The filtration mechanism is located at the outlet end of the baking chamber. The filtration mechanism includes: a filtration section for filtering the gas discharged from the outlet end of the baking chamber; a first monitoring section located on the side of the filtration mechanism away from the outlet end of the baking chamber and used to monitor the concentration and pressure of the gas on the side of the filtration mechanism away from the outlet end of the baking chamber; a second monitoring section located inside the first pipe and used to monitor the concentration and pressure of the gas at the location of the first pipe; a third monitoring section located inside the second pipe and used to monitor the concentration and pressure of the gas at the location of the second pipe; and a fourth monitoring section located on the side of the filtration mechanism near the outlet end of the baking chamber and used to monitor the concentration of the gas on the side of the filtration mechanism near the outlet end of the baking chamber.

[0015] Therefore, by monitoring the concentration and pressure of the gas inside the explosion-proof rotary oven, inert gas can be added to the oven or the mixed gas inside can be released, enabling real-time and precise explosion prevention and suppression for different baked goods and different models of explosion-proof rotary ovens.

[0016] Furthermore, it also includes a heat exchange section, which comprises a burner and a heat exchanger. The burner and the heat exchanger are both located inside the first pipe. The burner is connected to the heat exchanger, and the heat exchanger is connected to the outside of the explosion-proof rotary furnace through a flue gas outlet.

[0017] Furthermore, it also includes: a blower, which is installed on the explosion-proof rotary furnace, one end of which is connected to the first pipe and the other end of which is connected to the second pipe.

[0018] Furthermore, the circulation pipeline also includes a third pipeline, the other end of which is connected to one end of the third pipeline, and the other end of the third pipeline is connected to the inlet of the baking chamber.

[0019] Furthermore, a second connecting pipe is provided on the other side of the inert gas storage tank, the second connecting pipe extending to the outside of the explosion-proof rotary furnace, and a shut-off valve is connected in series with the second connecting pipe, the shut-off valve being located outside the explosion-proof rotary furnace.

[0020] Furthermore, the pressure relief mechanism is also connected in series with a silencer, which is located on the side of the pressure relief valve away from the explosion-proof rotary furnace. A vent pipe is also provided at the end of the pressure relief pipe away from the explosion-proof rotary furnace. Thus, by adding a silencer, the noise generated during pressure relief can be reduced.

[0021] Furthermore, the filtration mechanism also includes: a baffle, a solid adsorption section, and a dust collection tank. The baffle, the filtration section, and the solid adsorption section are connected in sequence. The dust collection tank is located at the bottom of the filtration section and is connected to the baffle and the solid adsorption section. The filtration section includes: a fixed plate and a filter screen. The filter screen is slidably connected to the fixed plate. The baffle and the solid adsorption section are both connected to the fixed plate. Thus, through the baffle, when the gas flows through the gap between the baffles, the solid dust is thrown out due to the sharp turn, achieving initial separation and falling into the dust collection tank. Then, the mixed gas passes through the filter screen, achieving sieving (secondary separation) of the solid dust. The sieved dust adheres to the filter screen or falls into the dust collection tank. By replacing the filter screen and the dust collection tank, the high efficiency of the filter screen can be ensured. The solid adsorption section adsorbs and removes combustible organic gases in the mixed gas, effectively reducing the concentration of combustible organic gases in the air and preventing the mixed gas entering the burner and heat exchanger from exploding under high temperature.

[0022] Furthermore, it also includes a motor, a rotating shaft, and a baking rack. The motor is installed outside the explosion-proof rotary oven, and the baking rack is located inside the baking chamber. The drive end of the motor is connected to the baking rack via the rotating shaft. Thus, the motor drives the baking rack to rotate, ensuring that the food inside the baking rack is baked evenly.

[0023] Furthermore, the first monitoring unit, the second monitoring unit, and the third monitoring unit have the same structure; the first monitoring unit includes a first concentration sensor and a pressure sensor; the fourth monitoring unit is a second concentration sensor.

[0024] A control method for an explosion-proof rotary furnace includes the following steps:

[0025] S1. Obtain the concentration of the gas in the first monitoring unit, the concentration of the gas in the second monitoring unit, and the concentration of the gas in the third monitoring unit. If the concentration of the gas in the first monitoring unit, the concentration of the gas in the second monitoring unit, or the concentration of the gas in the third monitoring unit exceeds 90% of the first explosion preset concentration, then execute S2; otherwise, execute S9.

[0026] S2. Open the electric regulating valve so that the inert gas in the inert gas storage tank is injected into the first pipeline through the first connecting pipe;

[0027] S3. If the concentration of the gas in the first monitoring unit, the concentration of the gas in the second monitoring unit, or the concentration of the gas in the third monitoring unit exceeds 90% of the second explosion preset concentration, then execute S4; otherwise, execute S7.

[0028] S4. Open the pressure relief valve to allow the mixed gas in the second pipeline to be discharged;

[0029] S5. If the concentration of the gas in the first monitoring unit, the concentration of the gas in the second monitoring unit, or the concentration of the gas in the third monitoring unit exceeds 80% of the first explosion preset concentration, then execute S6.

[0030] S6. Close the electric regulating valve and the pressure relief valve, and execute S9;

[0031] S7. If the concentration of the gas in the first monitoring unit, the concentration of the gas in the second monitoring unit, or the concentration of the gas in the third monitoring unit exceeds 80% of the first explosion preset concentration, then execute S8; otherwise, execute S3.

[0032] S8. Close the electric regulating valve and execute S9;

[0033] S9. Obtain the pressure of the gas in the first monitoring unit, the pressure of the gas in the second monitoring unit, and the pressure of the gas in the third monitoring unit. If the concentration of the gas in the first monitoring unit, the gas in the second monitoring unit, or the gas in the third monitoring unit exceeds 90% of the preset pressure, then execute S10; otherwise, execute S12.

[0034] S10. Open the pressure relief valve to allow the mixed gas in the second pipeline to be discharged;

[0035] S11. If the pressure of the gas in the first monitoring unit, the pressure of the gas in the second monitoring unit, or the concentration of the gas in the third monitoring unit exceeds 80% of the preset pressure;

[0036] S12. Close the pressure relief valve.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention monitors the concentration and pressure of the gas inside the explosion-proof rotary oven to replenish inert gas or release the mixed gas inside the oven, thereby achieving real-time and precise explosion prevention and suppression for different baked goods and different models of explosion-proof rotary ovens.

[0039] The present invention also includes the following advantages:

[0040] 1. This invention only adds small devices such as an inert gas storage tank, pressure relief valve, solid adsorption section, filter screen and baffle to the traditional rotary furnace. It does not require changes to the existing rotary furnace structure and baking process, and is simple, clear and easy to operate.

[0041] 2. This invention utilizes small devices such as inert gas storage tanks, pressure relief valves, solid adsorption sections, filters, and baffles to achieve integrated explosion-proof and explosion-suppression of the explosion-proof rotary furnace through the coordinated use of multiple methods, including reducing the concentration of mixed gas, combustible emissions, and adsorption of combustible gases. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the explosion-proof rotary furnace of the present invention;

[0043] Figure 2 This is a cross-sectional view of the explosion-proof rotary furnace of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of the inert gas storage tank of the present invention;

[0045] Figure 4 This is a schematic diagram of the pressure relief mechanism of the present invention;

[0046] Figure 5 This is a schematic diagram of the filtration mechanism of the present invention;

[0047] Figure 6 This is a schematic diagram of the structure of the filter section of the present invention;

[0048] Figure 7 This is a schematic diagram of the structure of the first monitoring unit of the present invention.

[0049] Figure 8 This is a flowchart of the control method for the explosion-proof rotary furnace of the present invention.

[0050] Among them: 1. Explosion-proof rotary furnace;

[0051] 101. Baking Room;

[0052] 2. Circulation pipeline;

[0053] 201. First pipeline; 202. Second pipeline; 203. Third pipeline;

[0054] 3. Inert gas storage tank;

[0055] 301. Nozzle; 302. First connecting pipe; 303. Electric regulating valve; 304. Second connecting pipe; 305. Shut-off valve; 306. Third connecting pipe; 307. Safety valve;

[0056] 4. Pressure relief mechanism;

[0057] 401. Pressure relief pipe; 402. Pressure relief valve; 403. Silencer; 404. Vent pipe;

[0058] 5. Filtration mechanism;

[0059] 501, Filter section; 5011, Fixing plate; 5012, Filter screen; 502, Baffle; 503, Solid adsorption section; 504, Dust collection tank;

[0060] 6. First Monitoring Department;

[0061] 601. First concentration sensor; 602. Pressure sensor;

[0062] 7. Second Monitoring Department;

[0063] 8. Third Monitoring Department;

[0064] 9. Second concentration sensor;

[0065] 10. Heat exchange section;

[0066] 11. Burner; 12. Heat exchanger;

[0067] 13. Smoke exhaust vent;

[0068] 14. Fan;

[0069] 15. Electric motor;

[0070] 16. Shaft;

[0071] 17. Grill. Detailed Implementation

[0072] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0073] like Figures 1 to 7 As shown, an explosion-proof rotary oven includes: an explosion-proof rotary oven 1, a circulation pipe 2, an inert gas storage tank 3, a pressure relief mechanism 4, a filtration mechanism 5, a first monitoring unit 6, a second monitoring unit 7, a third monitoring unit 8, and a fourth monitoring unit. The explosion-proof rotary oven 1 has a baking chamber 101 for baking food. The circulation pipe 2 includes: a first pipe 201 and a second pipe 202. One end of the first pipe 201 is connected to the second pipe 202, and the other end of the first pipe 201 is connected to the baking chamber 202. The outlet end of the baking chamber 101 is connected, and the other end of the second pipe 202 is connected to the inlet end of the baking chamber 101. The inert gas storage tank 3 is connected to the explosion-proof rotary furnace 1. A nozzle 301 is provided on one side of the inert gas storage tank 3. The nozzle 301 is located inside the first pipe 201 and is connected to the inert gas storage tank 3 through the first connecting pipe 302. An electric regulating valve 303 is connected in series on the first connecting pipe 302. The pressure relief mechanism 4 includes a pressure relief pipe 401 and a pressure relief valve 40. 2. The pressure relief pipe 401 passes through the explosion-proof rotary furnace 1 and is connected to the second pipe 202. The pressure relief valve 402 is located outside the explosion-proof rotary furnace 1 and is connected in series with the pressure relief pipe 401. The filter mechanism 5 is located at the outlet end of the baking chamber 101. The filter mechanism 5 includes: a filter section 501, which is used to filter the gas discharged from the outlet end of the baking chamber 101; a first monitoring section 6, which is located on the side of the filter mechanism 5 away from the outlet end of the baking chamber 101 and is used to monitor the concentration and pressure of the gas on the side of the filter mechanism 5 away from the outlet end of the baking chamber 101; a second monitoring section 7, which is located in the first pipe 201 and is used to monitor the concentration and pressure of the gas at the location of the first pipe 201; a third monitoring section 8, which is located in the second pipe 202 and is used to monitor the concentration and pressure of the gas at the location of the second pipe 202; and a fourth monitoring section, which is located on the side of the filter mechanism 5 near the outlet end of the baking chamber 101 and is used to monitor the concentration of the gas on the side of the filter mechanism 5 near the outlet end of the baking chamber 101. Therefore, by monitoring the concentration and pressure of the gas inside the explosion-proof rotary oven 1, inert gas can be added to the explosion-proof rotary oven 1 or the mixed gas inside the explosion-proof rotary oven 1 can be released, thereby achieving real-time and precise explosion prevention and suppression for different baked goods and different models of explosion-proof rotary oven 1.

[0074] Specifically, the inert gas enters the first pipe 201 and mixes with the gas in the first pipe 201 to form a mixed gas. The released inert gas can quickly reduce the concentration of the entire mixed gas.

[0075] Specifically, the baking chamber 101 is also equipped with a cabinet door (not shown in the figure). When baking is being carried out, the cabinet door is closed to make the baking chamber 101 a sealed space, thereby improving the baking efficiency of the entire device.

[0076] In this embodiment, the system further includes a heat exchange section 10, which comprises a burner 11 and a heat exchanger 12. Both the burner 11 and the heat exchanger 12 are located within the first pipe 201. The burner 11 is connected to the heat exchanger 12, and the heat exchanger 12 is connected to the outside of the explosion-proof rotary furnace 1 through a flue gas outlet 13. Specifically, the heat exchange section 10 may also employ electric heating, such as an electric heating tube or an electric heating wire.

[0077] In this embodiment, a fan 14 is also included. The fan 14 is installed on the explosion-proof rotary oven 1. One end of the fan 14 is connected to the first pipe 201, and the other end of the fan 14 is connected to the second pipe 202. Specifically, the heat exchange section 10 is used to heat and exchange the air, and the fan 14 is used to circulate the air between the first pipe 201, the second pipe 202, the third pipe 203, and the baking chamber 101, so as to bake the food in the baking chamber 101.

[0078] In this embodiment, the circulation pipe 2 further includes a third pipe 203, the other end of the second pipe 202 is connected to one end of the third pipe 203, and the other end of the third pipe 203 is connected to the inlet end of the baking chamber 101.

[0079] In this embodiment, a second connecting pipe 304 is provided on the other side of the inert gas storage tank 3. The second connecting pipe 304 extends to the outside of the explosion-proof rotary furnace 1. A shut-off valve 305 is connected in series with the second connecting pipe 304. The shut-off valve 305 is located outside the explosion-proof rotary furnace 1. Specifically, the inert gas storage tank 3 is made of metal and is constructed as a sealed cavity. A pressure gauge (not shown in the figure) is connected in series on the second connecting pipe 304. The pressure gauge can monitor the pressure inside the inert gas storage tank 3, allowing inert gas to be injected into the inert gas storage tank 3 by opening the shut-off valve 305 and through the second connecting pipe 304. The inert gas storage tank 3 is also equipped with a third connecting pipe 306, on which a safety valve 307 is installed. When the inert gas storage tank 3 is overpressurized, the safety valve 307 is opened, and the inert gas inside the inert gas storage tank 3 is discharged through the third connecting pipe 306 to achieve automatic pressure relief. In addition, the third connecting pipe 306 is oriented upwards, allowing the overpressurized inert gas to be discharged upwards to a safe area. The inert gas storage tank 3 is square in shape and can also serve as the outer shell of the explosion-proof rotary furnace 1.

[0080] In this embodiment, the pressure relief mechanism 4 is also connected in series with a silencer 403. The silencer 403 is located on the side of the pressure relief valve 402 away from the explosion-proof rotary furnace 1, and a vent pipe 404 is also provided at the end of the pressure relief pipe 401 away from the explosion-proof rotary furnace 1. Thus, by adding the silencer 403, the noise generated during pressure relief can be reduced.

[0081] In this embodiment, the filtration mechanism 5 further includes: a baffle 502, a solid adsorption part 503, and a dust collection tank 504. The baffle 502, the filtration part 501, and the solid adsorption part 503 are connected in sequence. The dust collection tank 504 is located at the bottom of the filtration part 501 and is connected to the baffle 502 and the solid adsorption part 503. The filtration part 501 includes: a fixing plate 5011 and a filter screen 5012. The filter screen 5012 is slidably connected to the fixing plate 5011. The baffle 502 and the solid adsorption part 503 are both connected to the fixing plate 5011. Thus, through the baffle 502, when the gas flows through the gap of the baffle 502, due to the sharp turn, the solid dust (a gas-solid mixture of hot air and combustible gas and combustible dust mixed in the air after passing through food) can be thrown out and achieve initial separation, falling into the dust collection tank 504. Then, the mixed gas passes through the filter screen 5012 to achieve sieving (secondary separation) of solid dust. The sieved dust adheres to the filter screen 5012 or falls into the dust collection tank 504. By replacing the filter screen 5012 and the dust collection tank 504, the high efficiency of the filter screen 5012 can be ensured. The solid adsorption part 503 adsorbs and removes combustible organic gases in the mixed gas, effectively reducing the concentration of combustible organic gases in the air, preventing the mixed gas entering the burner 11 and heat exchanger 12 from exploding under high temperature.

[0082] Specifically, baffles 502 are fixed to fixed plates 5011 by welding or bolts, and multiple baffles 502 are provided, which are arranged in parallel with each other; baffles 502 are thin metal plates, and the width of baffles 502 is equivalent to that of fixed plates 5011; the cross-sectional area of ​​the gap between parallel baffles 502 should be such that the air velocity is 2m / s-5m / s, and the angle between baffles 502 and the air flow direction is less than 45°. When air flows through the gap between parallel baffles 502, the air turns sharply, which can achieve the initial separation of dust from the air. The separated dust settles into the dust collection tank 504 under the action of gravity.

[0083] Specifically, filter 5012 is a metal filter with a metal frame, which is easy to replace by sliding installation.

[0084] Specifically, the solid adsorption section 503 (filled with solid adsorbent) adopts a box-type structure to facilitate the replacement of the solid adsorbent, and has a high-temperature resistant metal shell; the solid adsorbent is suitable for low and medium temperature use (100℃-120℃, food baking temperature range), such as food-grade silica gel, zeolite molecular sieve, activated alumina, etc.

[0085] Specifically, the filter section 501, baffle 502, solid adsorption section 503, and dust collection tank 504 are arranged along the height direction of the side plate at the outlet end of the baking chamber 101, thus saving space in the baking chamber 101.

[0086] It should be noted that:

[0087] 1. The mixed gas is released through the pressure relief mechanism 4 to reduce the pressure of the mixed gas, thereby achieving explosion-proof treatment for excessive pressure;

[0088] Second, inert gas is released through inert gas storage tank 3 to reduce the concentration of mixed gas. Through the cooperation of baffle 502 and filter screen 5012, dust in the mixed gas can be filtered. Combustible gas in the mixed gas can be adsorbed by solid adsorption part 503, thereby achieving explosion-proof treatment for excessively high concentrations.

[0089] In this embodiment, the oven also includes a motor 15, a rotating shaft 16, and a baking rack 17. The motor 15 is installed outside the explosion-proof rotary oven 1, and the baking rack 17 is located inside the baking chamber 101. The drive end of the motor 15 is connected to the baking rack 17 via the rotating shaft 16. Thus, the motor 15 drives the baking rack 17 to rotate, so that the food inside the baking rack 17 is baked evenly.

[0090] In this embodiment, the first monitoring unit 6, the second monitoring unit 7, and the third monitoring unit 8 have the same structure; the first monitoring unit 6 includes a first concentration sensor 601 and a pressure sensor 602; the fourth monitoring unit is a second concentration sensor 9.

[0091] The baking process of the food of the present invention is as follows: First, open the cabinet door, put the food to be baked into the baking rack 17, and then close the cabinet door; next, start the heat exchange unit 10, the fan 14 and the motor 15. The heat exchange unit 10 heats the food to form a heat source gas, and the fan 14 makes the heat source gas circulate in the first pipe 201, the second pipe 202, the third pipe 203 and the baking chamber 101. The motor 15 controls the baking rack 17 to rotate, so that the food rotates. The rotating food is baked by the flowing heat source gas. After the food is baked, the heat exchange unit 10, the fan 14 and the motor 15 are turned off, and the cabinet door is opened to complete the baking of the food.

[0092] like Figure 8 As shown, a control method for an explosion-proof rotary furnace includes the following steps:

[0093] S1. Obtain the gas concentration of the first monitoring unit 6, the gas concentration of the second monitoring unit 7, and the gas concentration of the third monitoring unit 8. If the gas concentration of the first monitoring unit 6, the gas concentration of the second monitoring unit 7, or the gas concentration of the third monitoring unit 8 exceeds 90% of the first explosion preset concentration, then execute S2; otherwise, execute S9.

[0094] S2. Open the electric regulating valve 303 so that the inert gas in the inert gas storage tank 3 is injected into the first pipe 201 through the first connecting pipe 302;

[0095] S3. If the concentration of the gas in the first monitoring unit 6, the concentration of the gas in the second monitoring unit 7, or the concentration of the gas in the third monitoring unit 8 exceeds 90% of the second explosion preset concentration, then execute S4; otherwise, execute S7.

[0096] S4. Open the pressure relief valve 402 to allow the mixed gas in the second pipe 202 to be discharged;

[0097] S5. If the concentration of the gas in the first monitoring unit 6, the concentration of the gas in the second monitoring unit 7, or the concentration of the gas in the third monitoring unit 8 exceeds 80% of the first explosion preset concentration, then execute S6.

[0098] S6. Close the electric regulating valve 303 and the pressure relief valve 402, and execute S9;

[0099] S7. If the concentration of the gas in the first monitoring unit 6, the concentration of the gas in the second monitoring unit 7, or the concentration of the gas in the third monitoring unit 8 exceeds 80% of the first explosion preset concentration, then execute S8; otherwise, execute S3.

[0100] S8. Close the electric regulating valve 303 and execute S9;

[0101] S9. Obtain the pressure of the gas in the first monitoring unit 6, the second monitoring unit 7, and the third monitoring unit 8. If the concentration of the gas in the first monitoring unit 6, the second monitoring unit 7, or the third monitoring unit 8 exceeds 90% of the preset pressure, then execute S10; otherwise, execute S12.

[0102] S10. Open the pressure relief valve 402 to allow the mixed gas in the second pipe 202 to be discharged;

[0103] S11. If the concentration of the gas pressure in the first monitoring unit 6, the second monitoring unit 7, or the third monitoring unit 8 exceeds 80% of the preset pressure;

[0104] S12, Close the pressure relief valve 402.

[0105] In summary, by monitoring the concentration and pressure of the gas inside the explosion-proof rotary oven 1, the present invention can replenish inert gas into the explosion-proof rotary oven 1 or release the mixed gas inside the explosion-proof rotary oven 1, thereby achieving real-time and precise explosion prevention and suppression for different baked goods and different models of explosion-proof rotary ovens 1.

[0106] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. An explosion-proof rotary furnace, characterized in that, include: An explosion-proof rotary oven (1) is provided with a baking chamber (101) for baking food. Circulation pipe (2), the circulation pipe (2) comprising: A first pipe (201) and a second pipe (202), one end of the first pipe (201) is connected to the second pipe (202), the other end of the first pipe (201) is connected to the outlet end of the baking chamber (101), and the other end of the second pipe (202) is connected to the inlet end of the baking chamber (101); An inert gas storage tank (3) is connected to the explosion-proof rotary furnace (1). A nozzle (301) is provided on one side of the inert gas storage tank (3). The nozzle (301) is located in the first pipe (201), and the nozzle (301) is connected to the inert gas storage tank (3) through the first connecting pipe (302). An electric regulating valve (303) is connected in series on the first connecting pipe (302). Pressure relief mechanism (4), the pressure relief mechanism (4) includes: Pressure relief pipe (401) and pressure relief valve (402), wherein the pressure relief pipe (401) passes through the explosion-proof rotary furnace (1) and is connected to the second pipeline (202); the pressure relief valve (402) is located outside the explosion-proof rotary furnace (1) and is connected in series with the pressure relief pipe (401); A filtration mechanism (5) is located at the outlet end of the baking chamber (101), and the filtration mechanism (5) includes: A filter unit (501) is used to filter the gas discharged from the outlet of the baking chamber (101). The system comprises a first monitoring unit (6), a second monitoring unit (7), a third monitoring unit (8), and a fourth monitoring unit. The first monitoring unit (6) is located on the side of the filter mechanism (5) away from the outlet end of the baking chamber (101) and is used to monitor the concentration and pressure of the gas on the side of the filter mechanism (5) away from the outlet end of the baking chamber (101). The second monitoring unit (7) is located inside the first pipe (201) and is used to monitor the concentration and pressure of the gas at the location of the first pipe (201). The third monitoring unit (8) is located inside the second pipe (202) and is used to monitor the concentration and pressure of the gas at the location of the second pipe (202). The fourth monitoring unit is located on the side of the filter mechanism (5) near the outlet end of the baking chamber (101) and is used to monitor the concentration of the gas on the side of the filter mechanism (5) near the outlet end of the baking chamber (101). The filtration mechanism (5) further includes: The baffle (502), the solid adsorption section (503), and the dust collection tank (504) are connected in sequence. The baffle (502), the filter section (501), and the solid adsorption section (503) are located at the bottom of the filter section (501) and are connected to the baffle (502) and the solid adsorption section (503). The filter section (501) includes: A fixed plate (5011) and a filter screen (5012) are provided, wherein the filter screen (5012) is slidably connected to the fixed plate (5011), and the baffle (502) and the solid adsorption part (503) are both connected to the fixed plate (5011). The first monitoring unit (6), the second monitoring unit (7), and the third monitoring unit (8) have the same structure; The first monitoring unit (6) includes: First concentration sensor (601) and pressure sensor (602); The fourth monitoring unit is the second concentration sensor (9).

2. The explosion-proof rotary furnace as described in claim 1, characterized in that: Also includes: Heat exchange section (10), the heat exchange section (10) includes: The burner (11) and the heat exchanger (12) are both located in the first pipe (201). The burner (11) is connected to the heat exchanger (12). The heat exchanger (12) is connected to the outside of the explosion-proof rotary furnace (1) through the flue gas outlet (13).

3. The explosion-proof rotary furnace as described in claim 1, characterized in that: Also includes: A blower (14) is installed on the explosion-proof rotary furnace (1). One end of the blower (14) is connected to the first pipe (201), and the other end of the blower (14) is connected to the second pipe (202).

4. The explosion-proof rotary furnace as described in claim 1, characterized in that: The circulation pipe (2) also includes: The third pipe (203) is connected to one end of the second pipe (202), and the other end of the third pipe (203) is connected to the inlet of the baking chamber (101).

5. The explosion-proof rotary furnace as described in claim 1, characterized in that: A second connecting pipe (304) is provided on the other side of the inert gas storage tank (3). The second connecting pipe (304) extends to the outside of the explosion-proof rotary furnace (1). A shut-off valve (305) is connected in series with the second connecting pipe (304). The shut-off valve (305) is located outside the explosion-proof rotary furnace (1).

6. The explosion-proof rotary furnace as described in claim 1, characterized in that: The pressure relief mechanism (4) is also connected in series with a silencer (403). The silencer (403) is located on the side of the pressure relief valve (402) away from the explosion-proof rotary furnace (1). The end of the pressure relief pipe (401) away from the explosion-proof rotary furnace (1) is also provided with a vent pipe (404).

7. The explosion-proof rotary furnace as described in claim 1, characterized in that: Also includes: The motor (15), the rotating shaft (16), and the baking rack (17) are provided. The motor (15) is installed outside the explosion-proof rotary oven (1), and the baking rack (17) is located inside the baking chamber (101). The drive end of the motor (15) is connected to the baking rack (17) through the rotating shaft (16).

8. A control method for an explosion-proof rotary furnace as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Obtain the gas concentration of the first monitoring unit (6), the gas concentration of the second monitoring unit (7), and the gas concentration of the third monitoring unit (8). If the gas concentration of the first monitoring unit (6), the gas concentration of the second monitoring unit (7), or the gas concentration of the third monitoring unit (8) exceeds 90% of the first explosion preset concentration, then execute S2; otherwise, execute S9. S2. Open the electric regulating valve (303) so that the inert gas in the inert gas storage tank (3) is injected into the first pipeline (201) through the first connecting pipe (302); S3. If the concentration of the gas in the first monitoring unit (6), the concentration of the gas in the second monitoring unit (7), or the concentration of the gas in the third monitoring unit (8) exceeds 90% of the second explosion preset concentration, then execute S4; otherwise, execute S7. S4. Open the pressure relief valve (402) to allow the mixed gas in the second pipe (202) to be discharged; S5. If the concentration of the gas in the first monitoring unit (6), the concentration of the gas in the second monitoring unit (7), or the concentration of the gas in the third monitoring unit (8) exceeds 80% of the first explosion preset concentration, then execute S6. S6. Close the electric regulating valve (303) and the pressure relief valve (402), and execute S9; S7. If the concentration of the gas in the first monitoring unit (6), the concentration of the gas in the second monitoring unit (7), or the concentration of the gas in the third monitoring unit (8) exceeds 80% of the first explosion preset concentration, then execute S8; otherwise, execute S3. S8. Close the electric regulating valve (303) and execute S9; S9. Obtain the pressure of the gas in the first monitoring unit (6), the pressure of the gas in the second monitoring unit (7), and the pressure of the gas in the third monitoring unit (8). If the pressure of the gas in the first monitoring unit (6), the pressure of the gas in the second monitoring unit (7), or the pressure of the gas in the third monitoring unit (8) exceeds 90% of the preset pressure, then execute S10; otherwise, execute S12. S10. Open the pressure relief valve (402) to allow the mixed gas in the second pipe (202) to be discharged; S11. If the concentration of the gas pressure in the first monitoring unit (6), the second monitoring unit (7), or the third monitoring unit (8) does not exceed 80% of the preset pressure, execute S12. S12. Close the pressure relief valve (402).

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