Nitrogen purging device for gas-fired double-hearth kiln

Abstract

The utility model discloses a gas formula double -muffle kiln nitrogen gas purging device, gas formula double -muffle kiln includes each other intercommunication A bore and B bore, include: first coal gas ring pipe, second coal gas ring pipe, nitrogen pipeline, coal gas pipeline and spray gun cooling air pipeline, first coal gas ring pipe and second coal gas ring pipe are arranged in A bore and B bore respectively, and first coal gas ring pipe and second coal gas ring pipe are used for transmitting coal gas to enter A bore and B bore respectively, and coal gas pipeline is linked with first coal gas ring pipe and second coal gas ring pipe respectively, and nitrogen pipeline is linked with first coal gas ring pipe and second coal gas ring pipe respectively, and spray gun cooling air pipeline is linked with first coal gas ring pipe and second coal gas ring pipe respectively, and the coal gas pipeline is installed with coal gas quick -cut valve, and nitrogen pipeline is installed with nitrogen purging valve and first check valve, and spray gun cooling air pipeline is installed with spray gun cooling air quick -cut valve and second check valve, the nitrogen purging device simple structure of the utility model reduces purging time, reduces cost, belongs to lime kiln technical field.

Description

Technical Field

[0001] This utility model belongs to the field of lime kiln technology, and specifically relates to a nitrogen purging device for a gas-fired double-chamber kiln. Background Technology

[0002] A double-chamber vertical kiln has two cylinders connected by a connecting channel located between them. Its greatest advantages during calcination are co-flow and heat storage. "Co-flow" means that during calcination of the combustion cylinder, the gas, combustion air, and limestone flow downwards side-by-side, and the combustion flue gas also flows downwards, which is beneficial for producing high-quality active lime. "Heat storage" refers to the fact that the high-temperature flue gas—the fuel combustion products—enters the heat storage chamber through the connecting channel between the two kiln chambers. In the heat storage chamber, the high-temperature flue gas flows upwards, transferring heat to the limestone raw material in the preheating zone, preheating the stone to a higher temperature. Simultaneously, the high-temperature exhaust gas, after heat exchange, cools down and is discharged from the kiln chamber through a flue gas bag filter. After heat exchange, the heat from the flue gas is used to preheat the stone, while the flue gas temperature is reduced, thus achieving the purpose of utilizing the waste heat of the exhaust gas and ensuring the kiln has high thermal efficiency.

[0003] The existing double-chamber kiln nitrogen purging device includes a chamber A, a chamber B, a combustion fan, and a cooling fan. Chamber A and chamber B are connected to each other through an intermediate channel. The combustion fan is connected to the upper part of chambers A and B. Both chambers A and B are equipped with gas ring pipes. Both chambers A and B are equipped with spray guns at their upper parts. The spray guns are connected to the gas pipes through the gas ring pipes. The gas ring pipes are connected to the nitrogen ring pipes. The cooling fan is connected to the lower part of chambers A and B. Both chambers A and B are equipped with cooling air dampers at their lower parts. The cooling fan is connected to the gas ring pipes of chambers A and B through spray gun cooling air pipes. The spray gun cooling air pipes leading to the gas ring pipes of chambers A and B are equipped with spray gun cooling air pipe check valves and spray gun cooling air pipe quick-cut valves.

[0004] The existing nitrogen purging device for double-chamber kilns has a long reversal time and burnout time, resulting in high nitrogen consumption. In addition, the pipeline is relatively complex, and there are many check valves used to connect the nitrogen loop and the gas loop, which makes it prone to failure. Utility Model Content

[0005] The purpose of this invention is to provide a gas-fired double-chamber kiln nitrogen purging device, which has a simple structure, reduces purging time, and lowers costs.

[0006] The specific technical solution is as follows:

[0007] A nitrogen purging device for a gas-fired double-chamber kiln, comprising interconnected chambers A and B, including: a first gas ring pipe, a second gas ring pipe, a nitrogen pipeline, a gas pipeline, and a lance cooling air pipeline. The first and second gas ring pipes are respectively installed in chambers A and B, and are used to transmit gas into chambers A and B respectively. The gas pipeline is connected to both the first and second gas ring pipes, the nitrogen pipeline is connected to both the first and second gas ring pipes, and the lance cooling air pipeline is connected to both the first and second gas ring pipes. A gas quick-cut valve is installed on the gas pipeline, a nitrogen purging valve and a first check valve are installed on the nitrogen pipeline, and a lance cooling air quick-cut valve and a second check valve are installed on the lance cooling air pipeline.

[0008] Preferably, the gas pipeline is connected to the first gas ring pipe and the second gas ring pipe via the first pipeline and the second pipeline respectively. There are three gas quick-cut valves, which are installed on the gas pipeline, the first pipeline, and the second pipeline respectively. The nitrogen pipeline is connected to the first gas ring pipe and the second gas ring pipe via the third pipeline and the fourth pipeline respectively. There are two nitrogen purge valves and two first check valves. One nitrogen purge valve and one first check valve are installed on the third pipeline, and one nitrogen purge valve and one first check valve are installed on the fourth pipeline. The spray gun cooling air pipeline is connected to the first gas ring pipe and the second gas ring pipe via the fifth pipeline and the sixth pipeline respectively. There are two spray gun cooling air quick-cut valves and two second check valves. One spray gun cooling air quick-cut valve and one second check valve are installed on the fifth pipeline, and one spray gun cooling air quick-cut valve and one second check valve are installed on the sixth pipeline.

[0009] Preferably, the connection between the third pipe and the first gas ring pipe is a portion of the first pipe between the first gas ring pipe and the gas quick-cut valve; the connection between the fourth pipe and the second gas ring pipe is a portion of the second pipe between the second gas ring pipe and the gas quick-cut valve; the connection between the fifth pipe and the first gas ring pipe is a portion of the first pipe between the first gas ring pipe and the gas quick-cut valve; and the connection between the sixth pipe and the second gas ring pipe is a portion of the second pipe between the second gas ring pipe and the gas quick-cut valve.

[0010] Preferably, when chamber A is in combustion mode and chamber B is in heat storage mode, the gas quick-cut valve on the first pipeline is open, the gas quick-cut valve on the second pipeline is closed; the nitrogen purging valve on the third pipeline is closed, the nitrogen purging valve on the fourth pipeline is closed; the spray gun cooling air quick-cut valve on the fifth pipeline is closed, and the spray gun cooling air quick-cut valve on the sixth pipeline is open.

[0011] Preferably, when the A chamber is in a burnout state, the gas quick-cut valve on the first pipeline is closed, the nitrogen purging valve on the third pipeline is opened, and the nitrogen purging valve on the third pipeline is closed after purging is completed; the gas quick-cut valve on the second pipeline is closed; the spray gun cooling air quick-cut valve on the fifth pipeline is opened, and the spray gun cooling air quick-cut valve on the sixth pipeline is opened.

[0012] Preferably, combustion chamber A is connected to a combustion air duct, the combustion air duct is connected to a combustion air blower, and a combustion air release valve is installed on the combustion air duct.

[0013] Preferably, both chamber A and chamber B are connected to cooling air ducts, the cooling air ducts are connected to cooling fans, and cooling air release valves are installed on the cooling air ducts; the spray gun cooling air duct is connected to the spray gun cooling fan.

[0014] Preferably, when chambers A and B enter the reversal period, the combustion air release valve and the cooling air release valve are opened, and the combustion air and cooling air in chambers A and B are discharged through the combustion air release valve and the cooling air release valve, respectively; the gas quick-cut valves on the first and second pipelines are closed, the nitrogen purging valves on the third and fourth pipelines are closed, and the spray gun cooling air quick-cut valves on the fifth and sixth pipelines are opened.

[0015] Preferably, when the B chamber is in combustion mode, the quick-cut valve for the spray gun cooling air on the fifth pipe is open, the quick-cut valve for the spray gun cooling air on the sixth pipe is closed, and the nitrogen purging valve on the fourth pipe is open; when the pressure in the A and B chambers reaches 10 kPa, the quick-cut valve for the gas on the second pipe is open, and the nitrogen purging valve on the fourth pipe is closed.

[0016] Compared with existing technologies, this utility model has the following beneficial effects:

[0017] 1. Compared with existing equipment, the gas-fired double-chamber kiln nitrogen purging device of this utility model optimizes the original nitrogen ring pipe, spray gun cooling air ring pipe and its auxiliary equipment and facilities, thereby reducing the equipment installation cost.

[0018] 2. This utility model's gas-fired double-chamber kiln nitrogen purging device optimizes the nitrogen purging method, achieving purging of coal gas while reducing production costs; the purging time per cycle is reduced from the original 2 minutes (120 seconds) to approximately 25 seconds. It is estimated that this will reduce production costs by 50 m³ / ton x (120-25) / 120 x 600 tons / day x 0.21 yuan / ton = 4987.50 yuan / day, and the estimated annual cost reduction for a single kiln is 1.8204 million yuan.

[0019] 3. The nitrogen purging device for a gas-fired double-chamber kiln of this utility model has good safety protection by installing quick-cut valves and check valves in both the nitrogen pipeline and the gas pipeline, as well as in both the spray gun cooling air pipeline and the gas pipeline. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of combustion in the A chamber of a double-chamber kiln.

[0022] Figure 2 This is a schematic diagram of nitrogen purging in a double-chamber kiln.

[0023] Figure 3 This is a schematic diagram of the spray gun structure in a double-chamber kiln.

[0024] Figure 4 This is a schematic diagram of the cooling airflow for the spray gun.

[0025] Figure 5 This is a schematic diagram of the nitrogen purging device for a gas-fired double-chamber kiln in Example 1.

[0026] 1 is the first gas ring pipe, 2 is the second gas ring pipe, 3 is the gas pipeline, 4 is the gas quick-cut valve, 5 is the nitrogen pipeline, 6 is the fourth pipeline, 7 is the spray gun cooling air pipeline, 8 is the spray gun cooling air quick-cut valve, 9 is the nitrogen purging valve, 10 is the first check valve, 11 is the second check valve, 12 is the second pipeline, 13 is the first pipeline, 14 is the third pipeline, 15 is the fifth pipeline, and 16 is the sixth pipeline. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0031] To facilitate understanding, the principle of a double-chamber vertical kiln will be explained here:

[0032] A double-chamber vertical kiln has two cylinders connected by a connecting channel located between them. Its greatest advantages during calcination are co-flow and heat storage. "Co-flow" means that during calcination of the combustion cylinder, the gas, combustion air, and limestone flow downwards side-by-side, and the combustion flue gas also flows downwards, which is beneficial for producing high-quality active lime. "Heat storage" refers to the fact that the high-temperature flue gas—the fuel combustion products—enters the heat storage chamber through the connecting channel between the two kiln chambers. In the heat storage chamber, the high-temperature flue gas flows upwards, transferring heat to the limestone raw material in the preheating zone, preheating the stone to a higher temperature. Simultaneously, the high-temperature exhaust gas, after heat exchange, cools down and is discharged from the kiln chamber through a flue gas bag filter. After heat exchange, the heat from the flue gas is used to preheat the stone, while the flue gas temperature is reduced, thus achieving the purpose of utilizing the waste heat of the exhaust gas and ensuring the kiln has high thermal efficiency.

[0033] During combustion operation, the two kiln chambers of the double-chamber kiln switch functions every 12-14 minutes, meaning that while one chamber is in calcination mode, the other is in heat storage mode. Unlike the sleeve kiln, the atmosphere inside the double-chamber vertical kiln is a positive pressure environment. Under normal conditions, the system supplies a large amount of coal gas and combustion air to the combustion chamber to ensure normal combustion, while the flue gas dust collector ensures that the top of the heat storage chamber is in a negative pressure environment. Therefore, the pressure in the combustion chamber is always higher than that in the heat storage chamber, allowing the high-temperature flue gas to flow smoothly into the heat storage chamber, achieving heat storage.

[0034] Under kiln combustion conditions, the system starts the combustion air fan, sending combustion air from top to bottom into the top of kiln cylinder A. When the combustion air passes through the preheating zone, it exchanges heat with the higher-temperature aggregate at the top of the combustion chamber, thus reaching a higher temperature. When the combustion air reaches the calcination zone of the kiln, it mixes with the gas supplied by the combustion chamber gas injector (e.g., ...). Figure 1 , 2 Because the stone temperature at the lower end of the spray gun is high, approaching 700℃, the gas reaches its ignition point and immediately combusts with the combustion air, generating heat. As the material is discharged from the bottom unloading platform, the material column moves downward, and the combustion air, stone, and combustion products flow downward together; this process is called "parallel flow." In the "parallel flow" state, the combustion air can fully utilize its thermal efficiency, while the gas combustion flame can fully contact the stone, maintaining high thermal efficiency. Approaching the cooling zone, near the suspension cylinder, the limestone surface temperature gradually decreases. When the limestone passes through combustion and enters the cooling zone, the cooling air cools the limestone, exchanging heat to lower its surface temperature to a certain level. The finished product is then discharged into the lime silo and unloaded by the bottom feeder. After heat exchange with the calcined lime, the cooling air's temperature rises, and it mixes with the combustion products through the connecting channel before entering kiln B. Inside kiln B, the exhaust gas flows upward, passing through the calcination zone and reaching the top of the regenerator. At the top of the regenerator, the stone material added by the rotating hopper acts as a large "heat exchanger." Through heat exchange, the flue gas temperature drops to approximately 160℃–180℃ and is discharged from the top of the kiln. After preheating by the flue gas in the regenerator, the stone material temperature rises to approximately 700℃. For high-capacity operations, a "feeding during combustion" production mode can be selected. In this mode, the system feeds the regenerator three times during combustion, with each cycle taking approximately 12–14 minutes to complete.

[0035] After the double-chamber kiln completes one calcination cycle, the system enters the reversing period. The entire reversing period takes approximately 45 seconds. About 100 seconds before entering the reversing period (burnout time, which can be adjusted via system parameters), the system immediately cuts off the gas supply to the kiln, and nitrogen purges the gas loop and spray gun loop to remove residual gas. During the reversing period, the combustion air release valve and cooling air release valve of the double-chamber kiln open successively to release the kiln pressure, and nitrogen continues to purge the gas loop and spray gun loop. Simultaneously, the platform unloading gate at 6.27 meters opens, discharging the lime blocks stored above the gate into the small hopper. The spray gun cooling air reversing valve changes position, beginning to cool the spray gun pipe of the new regenerator. The combustion air reversing gate activates, realizing the functional conversion between the regenerator and the calcining cylinder, and the next calcination cycle begins (e.g., Figure 4 ).

[0036] like Figure 2As shown, the nitrogen loop and the gas loop are connected via a check valve. During the burnout time, the gas quick-cut valve on the gas pipeline cuts off the gas supply. Then, the nitrogen purge valve in the combustion chamber opens, and nitrogen is fed into the nitrogen loop. Through the check valve, it enters the gas loop, purging the gas nozzle. Throughout the burnout and reversal times, nitrogen continuously purges the combustion chamber and gas loop through the nitrogen loop and the check valve.

[0037] After the burnout time reaches 0, the kiln begins its reversal period. The nitrogen purging valve of the regenerator opens, and nitrogen is sent to the cooling air ring pipe of the spray gun, entering the kiln through the gas spray gun to purge the spray gun and clean the gas ring pipe that is about to enter the combustion chamber.

[0038] During the new combustion time, nitrogen continuously purges the gas ring pipe of the combustion chamber through the spray gun cooling air ring pipe and the nitrogen ring pipe until the gas is sent into the combustion chamber through the gas quick-cut valve, at which point the nitrogen is cut off.

[0039] Because the process is quite complicated, it requires nitrogen purging time of no less than 200 seconds.

[0040] like Figure 2 As shown, the gas loop pipe is connected to the gas injection gun. Figure 3 As shown, the cooling air ring pipe of the spray gun is connected to the gas spray gun through a check valve.

[0041] The system's burnout time setting is primarily to ensure that residual gas is fully combusted during the combustion cycle. Simultaneously, nitrogen is mainly used for reversing the combustion in the dual-chamber gas kiln and for controlling the burnout time. It is used to purge residual gas from the gas ring pipe and spray gun ring pipe, preventing gas from mixing with air and causing a combustion explosion.

[0042] Example 1

[0043] like Figure 5 As shown, the nitrogen purging device for a gas-fired double-chamber kiln provided in this embodiment includes a gas-fired double-chamber kiln with interconnected chambers A and B, comprising: a first gas ring pipe 1, a second gas ring pipe 2, a nitrogen pipeline 5, a gas pipeline 3, and a spray gun cooling air pipeline 7. The first gas ring pipe 1 and the second gas ring pipe 2 are respectively installed in chambers A and B, and are used to transmit gas into chambers A and B respectively. The gas pipeline 3 is connected to the first gas ring pipe 1 and the second gas ring pipe 2, the nitrogen pipeline 5 is connected to the first gas ring pipe 1 and the second gas ring pipe 2, and the spray gun cooling air pipeline 7 is connected to the first gas ring pipe 1 and the second gas ring pipe 2. A gas quick-cut valve 4 is installed on the gas pipeline 3, a nitrogen purging valve 9 and a first check valve 10 are installed on the nitrogen pipeline 5, and a spray gun cooling air quick-cut valve 8 and a second check valve 11 are installed on the spray gun cooling air pipeline 7.

[0044] Gas pipeline 3 is connected to the first gas ring pipe 1 and the second gas ring pipe 2 via the first pipeline 13 and the second pipeline 12. There are three gas quick-cut valves 4, which are installed on gas pipeline 3, the first pipeline 13 and the second pipeline 12 respectively. Nitrogen pipeline 5 is connected to the first gas ring pipe 1 and the second gas ring pipe 2 via the third pipeline 14 and the fourth pipeline 6. There are two nitrogen purge valves 9 and two first check valves 10. One nitrogen purge valve 9 and one first check valve 10 are installed on the third pipeline 14 and one nitrogen purge valve 9 and one first check valve 10 are installed on the fourth pipeline 6. Spray gun cooling air pipeline 7 is connected to the first gas ring pipe 1 and the second gas ring pipe 2 via the fifth pipeline 15 and the sixth pipeline 16. There are two spray gun cooling air quick-cut valves 8 and two second check valves 11. One spray gun cooling air quick-cut valve 8 and one second check valve 11 are installed on the fifth pipeline 15 and one spray gun cooling air quick-cut valve 8 and one second check valve 11 are installed on the sixth pipeline 16.

[0045] The connection between the third pipe 14 and the first gas ring pipe 1 is the portion of the first pipe 13 between the first gas ring pipe 1 and the gas quick-cut valve 4; the connection between the fourth pipe 6 and the second gas ring pipe 2 is the portion of the second pipe 12 between the second gas ring pipe 2 and the gas quick-cut valve 4; the connection between the fifth pipe 15 and the first gas ring pipe 1 is the portion of the first pipe 13 between the first gas ring pipe 1 and the gas quick-cut valve 4; the connection between the sixth pipe 16 and the second gas ring pipe 2 is the portion of the second pipe 12 between the second gas ring pipe 2 and the gas quick-cut valve 4.

[0046] When chamber A is in combustion mode and chamber B is in heat storage mode, the gas quick-cut valve 4 on the first pipe 13 is open, and the gas quick-cut valve 4 on the second pipe 12 is closed; the nitrogen purging valve 9 on the third pipe 14 is closed, and the nitrogen purging valve 9 on the fourth pipe 6 is closed; the spray gun cooling air quick-cut valve 8 on the fifth pipe 15 is closed, and the spray gun cooling air quick-cut valve 8 on the sixth pipe 16 is open.

[0047] When the A chamber is in the burnout state, the gas quick-cut valve 4 on the first pipeline 13 is closed, and the nitrogen purging valve 9 on the third pipeline 14 is opened. After the purging is completed, the nitrogen purging valve 9 on the third pipeline 14 is closed; the gas quick-cut valve 4 on the second pipeline 12 is closed; the spray gun cooling air quick-cut valve 8 on the fifth pipeline 15 is opened, and the spray gun cooling air quick-cut valve 8 on the sixth pipeline 16 is opened.

[0048] The combustion chamber A is connected to a combustion air duct, which is connected to a combustion air blower. A combustion air release valve is installed on the combustion air duct.

[0049] Both chamber A and chamber B are connected to cooling ducts, which are connected to cooling fans. Cooling air release valves are installed on the cooling ducts; the spray gun cooling duct is connected to the spray gun cooling fan.

[0050] When chambers A and B enter the reversal period, the combustion air release valve and the cooling air release valve open, and the combustion air and cooling air in chambers A and B are discharged through the combustion air release valve and the cooling air release valve, respectively; the gas quick-cut valve 4 on the first pipe 13 and the second pipe 12 are both closed, the nitrogen purging valve 9 on the third pipe 14 and the fourth pipe 6 are both closed, and the spray gun cooling air quick-cut valve 8 on the fifth pipe 15 and the sixth pipe 16 are both open.

[0051] When the B chamber is in combustion mode, the quick-cut valve 8 for the spray gun cooling air on the fifth pipe 15 is open, the quick-cut valve 8 for the spray gun cooling air on the sixth pipe 16 is closed, and the nitrogen purging valve 9 on the fourth pipe 6 is open; when the pressure in the A and B chambers reaches 10 kPa, the quick-cut valve 4 for the gas on the second pipe 12 is open, and the nitrogen purging valve 9 on the fourth pipe 6 is closed.

[0052] Example 2

[0053] The purging method of the gas-fired double-chamber kiln nitrogen purging device provided in this embodiment adopts the gas-fired double-chamber kiln nitrogen purging device.

[0054] When chamber A is in combustion mode and chamber B is in heat storage mode, the gas quick-cut valve 4 on the first pipe 13 is open, and the gas quick-cut valve 4 on the second pipe 12 is closed; the nitrogen purging valve 9 on the third pipe 14 is closed, and the nitrogen purging valve 9 on the fourth pipe 6 is closed; the spray gun cooling air quick-cut valve 8 on the fifth pipe 15 is closed, and the spray gun cooling air quick-cut valve 8 on the sixth pipe 16 is open, so as to cool the spray gun in chamber B.

[0055] When the A chamber is in a burnout state, the gas quick-cut valve 4 on the first pipeline 13 closes, cutting off the gas supply to the A chamber. The combustion blower and cooling blower continue to operate, supplying combustion air and cooling air. The nitrogen purging valve 9 on the third pipeline 14 opens, and nitrogen is introduced into the spray gun of the A chamber to purge the first gas ring pipe 1 for 10-15 seconds. After purging, the nitrogen purging valve 9 on the third pipeline 14 closes. The gas quick-cut valve 4 on the second pipeline 12 closes. The spray gun cooling air quick-cut valve 8 on the fifth pipeline 15 opens, and spray gun cooling air is introduced into the first gas ring pipe 1 to cool the spray gun of the A chamber. The spray gun cooling air quick-cut valve 8 on the sixth pipeline 16 opens.

[0056] When chambers A and B enter the reversal period, the combustion air release valve and the cooling air release valve open, and the combustion air and cooling air in chambers A and B are discharged through the combustion air release valve and the cooling air release valve, respectively; the gas quick-cut valve 4 on the first pipe 13 and the second pipe 12 are both closed, the nitrogen purging valve 9 on the third pipe 14 and the fourth pipe 6 are both closed, and the spray gun cooling air quick-cut valve 8 on the fifth pipe 15 and the sixth pipe 16 are both open.

[0057] When the B chamber is in combustion, the quick-cut valve 8 for the spray gun cooling air on the fifth pipe 15 is open, and the spray gun cooling air supplied by the spray gun cooling fan enters the first gas ring pipe 1 through the spray gun cooling air pipe to cool the spray gun in the A chamber. The quick-cut valve 8 for the spray gun cooling air on the sixth pipe 16 is closed, and the nitrogen purging valve 9 on the fourth pipe 6 is open to purge the second gas ring pipe 2. As the combustion air and cooling air are blown into the A and B chambers, when the pressure in the A and B chambers reaches 10 kPa, the gas quick-cut valve 4 on the second pipe 12 is opened, and the gas is sent into the spray gun through the second gas ring pipe 2. The nitrogen purging valve 9 on the fourth pipe 6 is closed. During the entire combustion period, the nitrogen purging time is 10 seconds.

[0058] The parts not mentioned in this embodiment are the same as in Embodiment 1.

[0059] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A nitrogen purging device for a gas-fired double-hearth kiln, the gas-fired double-hearth kiln comprising an A hearth and a B hearth which are in communication with each other, characterized by, The utility model relates to a kind of gas distribution system of multi-burner, including: First gas ring pipe, second gas ring pipe, nitrogen pipeline, gas pipeline and lance cooling air pipeline, first gas ring pipe and second gas ring pipe are arranged in A bore and B bore respectively, first gas ring pipe and second gas ring pipe are used to transmit gas into A bore and B bore respectively, gas pipeline is connected with first gas ring pipe and second gas ring pipe respectively, nitrogen pipeline is connected with first gas ring pipe and second gas ring pipe respectively, lance cooling air pipeline is connected with first gas ring pipe and second gas ring pipe respectively, gas pipeline is installed with gas quick cut valve, nitrogen pipeline is installed with nitrogen purge valve and first check valve, lance cooling air pipeline is installed with lance cooling air quick cut valve and second check valve.

2. The nitrogen purging device for a gas-fired twin-muffle kiln according to claim 1, characterized by Gas pipeline is connected with first gas ring pipe and second gas ring pipe through first pipeline and second pipeline respectively, the number of gas quick cut valve is three, three gas quick cut valves are installed on gas pipeline, first pipeline and second pipeline respectively;Nitrogen pipeline is connected with first gas ring pipe and second gas ring pipe through third pipeline and fourth pipeline respectively, the number of nitrogen purge valve and first check valve is two, one nitrogen purge valve and one first check valve are installed on third pipeline, one nitrogen purge valve and one first check valve are installed on fourth pipeline;Lance cooling air pipeline is connected with first gas ring pipe and second gas ring pipe through fifth pipeline and sixth pipeline respectively, the number of lance cooling air quick cut valve and second check valve is two, one lance cooling air quick cut valve and one second check valve are installed on fifth pipeline, one lance cooling air quick cut valve and one second check valve are installed on sixth pipeline.

3. The nitrogen purging device for a gas-fired twin-muffle kiln according to claim 2, characterized by, The connection of third pipeline and first gas ring pipe is the part of first pipeline between first gas ring pipe and gas quick cut valve;The connection of fourth pipeline and second gas ring pipe is the part of second pipeline between second gas ring pipe and gas quick cut valve;The connection of fifth pipeline and first gas ring pipe is the part of first pipeline between first gas ring pipe and gas quick cut valve;The connection of sixth pipeline and second gas ring pipe is the part of second pipeline between second gas ring pipe and gas quick cut valve.

4. The nitrogen purging device for a gas-fired twin-muffle kiln according to claim 2, characterized by When A bore is in combustion state, B bore is in heat accumulation state, gas quick cut valve on first pipeline is opened, and gas quick cut valve on second pipeline is closed;Nitrogen purge valve on third pipeline is closed, and nitrogen purge valve on fourth pipeline is closed;Lance cooling air quick cut valve on fifth pipeline is closed, and lance cooling air quick cut valve on sixth pipeline is opened.

5. The nitrogen purging device for a gas-fired dual-fired kiln of claim 2, wherein, When A bore is in burnout state, gas quick cut valve on first pipeline is closed, and nitrogen purge valve on third pipeline is opened, nitrogen purge valve on third pipeline is closed after purging;Gas quick cut valve on second pipeline is closed;Lance cooling air quick cut valve on fifth pipeline is opened, and lance cooling air quick cut valve on sixth pipeline is opened.

6. The nitrogen purging device for a gas-fired dual-fired kiln of claim 2, wherein, A bore is connected with combustion air pipe, combustion air pipe is connected with combustion air fan, and combustion air release valve is installed on combustion air pipe.

7. The nitrogen purging apparatus for a gas-fired dual-fired kiln of claim 6, wherein, A bore and B bore are connected with cooling air pipe, cooling air pipe is connected with cooling air fan, and cooling air release valve is installed on cooling air pipe;Lance cooling air pipe is connected with lance cooling air fan.

8. The nitrogen purging apparatus for a gas-fired dual-fired kiln of claim 7, wherein, When the A-bore and the B-bore enter the reversing period, the combustion air release valve and the cooling air release valve are opened, and the combustion air and the cooling air in the A-bore and the B-bore are discharged through the combustion air release valve and the cooling air release valve respectively; the gas quick switching valves on the first pipeline and the second pipeline are both closed, the nitrogen purge valves on the third pipeline and the fourth pipeline are both closed, and the lance cooling air quick switching valves on the fifth pipeline and the sixth pipeline are both opened.

9. The nitrogen purging device for a gas-fired dual-fired kiln of claim 2, wherein, When the B-bore is in the combustion state, the lance cooling air quick switching valve on the fifth pipeline is in the opened state, the lance cooling air quick switching valve on the sixth pipeline is in the closed state, and the nitrogen purge valve on the fourth pipeline is opened; when the pressure in the A-bore and the B-bore reaches 10 kpa, the gas quick switching valve on the second pipeline is opened, and the nitrogen purge valve on the fourth pipeline is closed.

Images