Gas type double-hearth kiln nitrogen purging device and purging method thereof

Abstract

The invention discloses a fuel gas type double-chamber kiln nitrogen purging device and a purging method thereof.The fuel gas type double-chamber kiln comprises a chamber A and a chamber B which are communicated with each other and comprises a first gas ring pipe, a second gas ring pipe, a nitrogen pipeline, a gas pipeline and a spray gun cooling air pipeline, and the first gas ring pipe and the second gas ring pipe are arranged in the chamber A and the chamber B correspondingly; the first gas ring pipe and the second gas ring pipe are respectively used for conveying gas into the chamber A and the chamber B, the gas pipeline is respectively communicated with the first gas ring pipe and the second gas ring pipe, the nitrogen pipeline is respectively communicated with the first gas ring pipe and the second gas ring pipe, and the spray gun cooling air pipeline is respectively communicated with the first gas ring pipe and the second gas ring pipe. A gas quick switching valve is mounted on the gas pipeline, a nitrogen purging valve and a first check valve are mounted on the nitrogen pipeline, and a spray gun cooling air quick switching valve and a second check valve are mounted on the spray gun cooling air pipeline. The nitrogen purging device is simple in structure, the purging time is shortened, the cost is reduced, and the nitrogen purging device belongs to the technical field of lime kilns.

Description

Technical Field

[0001] The present invention relates to the technical field of lime kilns, and particularly to a nitrogen purging device for a gas-fired double-shaft kiln and a purging method thereof. Background Art

[0002] The double-shaft vertical kiln has two cylinders, which are connected by a connecting channel located in the middle of the two chambers. The greatest advantages during the calcination process are co-current flow and heat storage. "Co-current flow" means that when the gas is burned in the combustion cylinder, the gas, combustion-supporting air and limestone move downward side by side together, and the combustion flue gas also moves downward, which is conducive to calcining high-quality activated lime. "Heat storage" means that in the combustion cylinder, the combustion products of the fuel - high-temperature flue gas - enter the heat storage chamber through the connecting channel between the two kiln chambers. In the heat storage chamber, the high-temperature flue gas flows upward from bottom to top, delivering heat to the limestone raw materials in the preheating zone and preheating the stone materials to a relatively high temperature. At the same time, after heat exchange, the temperature of the high-temperature waste gas itself drops to a lower level and is discharged from the kiln chamber through the flue gas bag filter. After heat exchange, the heat of the flue gas is used to preheat the stone materials, and the temperature of the flue gas is reduced, thus achieving the purpose of utilizing the waste heat of the waste gas and ensuring that the kiln has a very high thermal efficiency.

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

[0004] Due to the long commutation time and burnout time of the existing nitrogen purging device for a double-shaft kiln, the nitrogen consumption is relatively high, and the pipeline setting is relatively complex. The number of check valves used for connecting the nitrogen ring pipe and the gas ring pipe is large, and it is easy to generate more faults. Summary of the Invention

[0005] Aiming at the above deficiencies, the present invention provides a nitrogen purging device for a gas-fired double-shaft kiln and a purging method thereof, with a simple structure, reduced purging time and lower cost.

[0006] The specific technical solutions are as follows:

[0007] Nitrogen purging device for gas-fired double-chamber kiln. The gas-fired double-chamber kiln includes an A chamber and a B chamber that are interconnected, and includes: a first gas ring pipe, a second gas ring pipe, a nitrogen pipeline, a gas pipeline, and a lance cooling air pipeline. The first gas ring pipe and the second gas ring pipe are respectively arranged in the A chamber and the B chamber, and are respectively used to transmit gas into the A chamber and the B chamber. The gas pipelines are respectively connected to the first gas ring pipe and the second gas ring pipe. The nitrogen pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe. The lance cooling air pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe. A gas quick cut-off 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-off valve and a second check valve are installed on the lance cooling air pipeline.

[0008] Preferably, the gas pipelines are respectively connected to the first gas ring pipe and the second gas ring pipe through a first pipeline and a second pipeline. The number of gas quick cut-off valves is three, and the three gas quick cut-off valves are respectively installed on the gas pipeline, the first pipeline, and the second pipeline. The nitrogen pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe through a third pipeline and a fourth pipeline. The number of nitrogen purging valves and the first check valves is two each. One nitrogen purging valve and one first check valve are installed on the third pipeline, and one nitrogen purging valve and one first check valve are installed on the fourth pipeline. The lance cooling air pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe through a fifth pipeline and a sixth pipeline. The number of lance cooling air quick cut-off valves and the second check valves is two each. One lance cooling air quick cut-off valve and one second check valve are installed on the fifth pipeline, and one lance cooling air quick cut-off valve and one second check valve are installed on the sixth pipeline.

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

[0010] Preferably, when the A chamber is in the combustion state and the B chamber is in the heat storage state, the gas quick cut-off valve on the first pipeline is opened, and the gas quick cut-off valve on the second pipeline is closed. The nitrogen purging valve on the third pipeline is closed, and the nitrogen purging valve on the fourth pipeline is closed. The lance cooling air quick cut-off valve on the fifth pipeline is closed, and the lance cooling air quick cut-off valve on the sixth pipeline is opened.

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

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

[0013] Preferably, both the A chamber and the B chamber are connected with cooling air ducts, the cooling air ducts are connected with cooling air blowers, and cooling air release valves are installed on the cooling air ducts; the lance cooling air duct is connected with a lance cooling air blower.

[0014] Preferably, when the A chamber and the B chamber enter the commutation 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 chamber and the B chamber are discharged through the combustion air release valve and the cooling air release valve respectively; the gas quick cut-off valves on the first pipeline and the second pipeline are both closed, the nitrogen purging valves on the third pipeline and the fourth pipeline are both closed, and the quick cut-off valves for the lance cooling air on the fifth pipeline and the sixth pipeline are both opened.

[0015] Preferably, when the B chamber is in the combustion state, the quick cut-off valve for the lance cooling air on the fifth pipeline is in the open state, the quick cut-off valve for the lance cooling air on the sixth pipeline is in the closed state, and the nitrogen purging valve on the fourth pipeline is opened; when the pressure in the A chamber and the B chamber reaches 10 kPa, the gas quick cut-off valve on the second pipeline is opened, and the nitrogen purging valve on the fourth pipeline is closed.

[0016] The purging method of the nitrogen purging device for the gas-fired double-chamber kiln adopts the nitrogen purging device for the gas-fired double-chamber kiln;

[0017] When the A chamber is in the combustion state and the B chamber is in the heat storage state, the gas quick cut-off valve on the first pipeline is opened, and the gas quick cut-off valve on the second pipeline is closed; the nitrogen purging valve on the third pipeline is closed, and the nitrogen purging valve on the fourth pipeline is closed; the quick cut-off valve for the lance cooling air on the fifth pipeline is closed, and the quick cut-off valve for the lance cooling air on the sixth pipeline is opened to cool the lance of the B chamber;

[0018] When the A chamber is in the burnout state, the gas quick cut valve on the first pipeline closes, cutting off the gas supply to the A chamber. The combustion air blower and the cooling air blower continue to operate to supply combustion air and cooling air. The nitrogen purging valve on the third pipeline opens, and nitrogen is sent into the lance of the A chamber to purge the first gas manifold for 10 - 15 seconds. After the purging is completed, the nitrogen purging valve on the third pipeline closes. The gas quick cut valve on the second pipeline closes. The lance cooling air quick cut valve on the fifth pipeline opens, sending lance cooling air into the first gas manifold, and through the first gas manifold, cooling the lance of the A chamber. The lance cooling air quick cut valve on the sixth pipeline opens.

[0019] When the A chamber and the B chamber enter the commutation period, the combustion air release valve and the cooling air release valve open, and the combustion air and cooling air in the A chamber and the B chamber are discharged through the combustion air release valve and the cooling air release valve respectively. The gas quick cut valves on the first pipeline and the second pipeline both close. The nitrogen purging valves on the third pipeline and the fourth pipeline both close. The lance cooling air quick cut valves on the fifth pipeline and the sixth pipeline both open.

[0020] When the B chamber is in the combustion state, the lance cooling air quick cut valve on the fifth pipeline is in the open state. The lance cooling air supplied by the lance cooling air blower enters the first gas manifold through the lance cooling air pipe to cool the lance of the A chamber. The lance cooling air quick cut valve on the sixth pipeline is in the closed state. The nitrogen purging valve on the fourth pipeline opens to purge the second gas manifold. As the combustion air and cooling air are blown into the A chamber and the B chamber, when the pressure in the A chamber and the B chamber reaches 10 kPa, the gas quick cut valve on the second pipeline opens, and gas is sent into the lance through the second gas manifold. The nitrogen purging valve on the fourth pipeline closes. During the entire combustion period, the nitrogen purging time is 10 seconds.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The nitrogen purging device of the gas - fired double - chamber kiln of the present invention optimizes the original nitrogen manifold, lance cooling air manifold and their attached equipment and facilities compared with the existing equipment, reducing the equipment installation cost.

[0023] 2. The nitrogen purging device of the gas - fired double - chamber kiln of the present invention optimizes the nitrogen purging method, achieving the reduction of production cost while purging gas. The purging time is reduced from the original 2 minutes (120 seconds) per cycle to about 25 seconds. It is estimated that the production cost can be reduced by 50 m³ / ton × (120 - 25) / 120 × 600 tons / day × 0.21 yuan / ton = 4987.50 yuan / day. It is estimated that the single kiln can achieve a cost reduction of 1.8204 million yuan throughout the year.

[0024] 3. The nitrogen purging device of the gas-fired double-chamber kiln of the present invention is provided with quick cut valves and check valves in both the nitrogen pipeline and the gas pipeline, and between the lance cooling air pipeline and the gas pipeline, which better ensures the safety of the gas-fired double-chamber kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for description in the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0026] Figure 1 It is a schematic diagram of the combustion of chamber A of the double-chamber kiln.

[0027] Figure 2 It is a schematic diagram of the nitrogen purging of the double-chamber kiln.

[0028] Figure 3 It is a schematic diagram of the lance structure of the double-chamber kiln.

[0029] Figure 4 It is a schematic diagram of the lance cooling air.

[0030] Figure 5 It is a schematic diagram of the nitrogen purging device of the gas-fired double-chamber kiln in Embodiment 1.

[0031] 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 lance cooling air pipeline, 8 is the lance 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, 16 is the sixth pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] In the description of the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceeding", etc. are understood not to include the base number, and "above", "below", "within", etc. are understood to include the base number. If terms such as "first", "second", "third" are described, they are only for descriptive purposes and for distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] For the convenience of understanding, the principle of the double-shaft vertical kiln is described herein:

[0037] The double-shaft vertical kiln has two cylinders, which are connected by a connecting channel located in the middle of the two chambers. The biggest advantages during the calcination process are co-current flow and heat storage. "Co-current flow" means that when the gas is burned in the combustion cylinder, the gas, combustion-supporting air and limestone move downward in parallel, and the combustion flue gas also moves downward, which is conducive to calcining high-quality active lime. "Heat storage" means that in the combustion cylinder, the combustion products of the fuel - high-temperature flue gas - enter the heat storage chamber through the connecting channel between the two kiln chambers. In the heat storage chamber, the high-temperature flue gas flows upward from bottom to top, conveys heat to the limestone raw materials in the preheating zone, and preheats the stone materials to a relatively high temperature. At the same time, after heat exchange, the temperature of the high-temperature waste gas itself drops to a relatively low level and is discharged from the kiln chamber through the flue gas bag filter. After heat exchange, the heat of the flue gas is used to preheat the stone materials, and the temperature of the flue gas is reduced, so that the purpose of utilizing the waste heat of the waste gas is achieved, thus ensuring that the furnace has a very high thermal efficiency.

[0038] During the combustion operation process, the two kiln cylinders of the double-shaft kiln perform a function conversion every 12 - 14 minutes, that is, when one kiln chamber is in the calcination state, the other kiln chamber is in the heat storage state. Contrary to the sleeve kiln, the atmosphere inside the double-shaft vertical kiln belongs to a positive pressure environment. Under normal conditions, the system conveys a large amount of gas and combustion-supporting air to the combustion chamber to ensure normal combustion in the combustion chamber, while the flue gas dust collector ensures a negative pressure environment at the top of the heat storage chamber. Therefore, the pressure in the combustion chamber is always higher than the pressure in the heat storage chamber, enabling the high-temperature flue gas to flow smoothly into the heat storage chamber to achieve heat storage.

[0039] Under the condition of the kiln furnace combustion, the system starts the combustion air blower and sends the combustion air into the top of the kiln cylinder A from top to bottom. When the combustion air passes through the preheating zone, it exchanges heat with the stones at a relatively high temperature at the top of the combustion chamber and reaches a relatively high temperature. When the combustion air reaches the calcination zone of the kiln furnace, it is mixed with the gas transported by the gas spray gun in the combustion chamber (such as Figure 1 , 2 ). Since the temperature of the stones at the lower end of the spray gun is relatively high, close to about 700 °C, the gas reaches the ignition point and immediately burns with the combustion air, generating heat. As the materials are discharged from the discharge platform at the bottom of the kiln and the material column moves down, the combustion air, the stones, and the combustion products flow downward together. This process is called "parallel flow". In the "parallel flow" state, the combustion air can fully exert its thermal efficiency, and at the same time, the gas combustion flame can fully contact the stones, maintaining a relatively high thermal efficiency. Near the cooling zone, when it is below the suspension cylinder, the surface temperature of the limestone gradually decreases. When the lime passes through combustion and enters the cooling zone, the cooling air cools the lime and conducts heat exchange, reducing the surface temperature of the lime to a certain extent, and then the finished product is discharged into the small lime bin and then unloaded by the feeder at the bottom of the kiln. After the cooling air and the calcined lime exchange heat, the temperature rises, and after passing through the connection channel, it is mixed with the combustion products and enters the kiln cylinder B. The waste gas in the kiln cylinder B flows from bottom to top, and after passing through the calcination zone, it reaches the top of the regenerative chamber. At the top of the regenerative chamber, the stones added by the rotary hopper are equivalent to a large "heat exchanger". Through heat exchange, the flue gas temperature drops to about 160 °C - 180 °C and is discharged from the kiln top. After the flue gas in the regenerative chamber is preheated, the temperature of the stones rises to about 700 °C. In the high-production state, the production mode of "feeding during combustion" can be selected. In this mode, during the combustion process, the system adds materials to the regenerative chamber 3 times, and each cycle takes about 12 - 14 minutes to complete.

[0040] When the double-chamber kiln completes a calcination cycle, the system enters the commutation period. The entire commutation period takes about 45 seconds. About 100 seconds before entering the commutation period (burnout time, this time can be adjusted through system parameters), the system will immediately cut off the gas supply to the kiln, and nitrogen purges the gas manifold and the spray gun manifold to clean the residual gas. During the commutation period, the combustion air release valve and the cooling air release valve of the double-chamber kiln are successively opened to release the pressure in the kiln, and nitrogen will continue to purge the gas manifold and the spray gun manifold. At the same time, the discharge gate at the 6.27-meter platform is opened, and the lime blocks stored above the gate are discharged into the small bin. The spray gun cooling air commutation valve changes its position and starts to cool the spray gun barrel of the new regenerative cylinder. The combustion air commutation gate operates to realize the function conversion between the regenerative cylinder and the calcination cylinder, and starts to re-calcine the next cycle (such as Figure 4 ).

[0041] Such as Figure 2As shown, the nitrogen ring pipe and the gas ring pipe are connected through a check valve. During the burnout time, the gas quick cut-off valve on the gas pipeline cuts off the gas. Then, the nitrogen purge valve of the combustion chamber is opened, and nitrogen is sent into the nitrogen ring pipe. Through the check valve, it enters the gas ring pipe to purge the gas spray gun. Throughout the burnout time and the commutation time, nitrogen continuously purges the gas ring pipe of the combustion chamber through the nitrogen ring pipe and the check valve.

[0042] After the burnout time is 0, the kiln furnace enters the commutation period. The nitrogen purge valve of the regenerative chamber is opened, and nitrogen is sent to the spray gun cooling air ring pipe, enters the kiln through the gas spray gun, and purges the spray gun, cleaning the gas ring pipe that is about to be transferred to the combustion chamber.

[0043] During the new combustion time, nitrogen continuously passes through the spray gun cooling air ring pipe and the nitrogen ring pipe, continuously purging the gas ring pipe of this chamber until gas is sent into this chamber through the gas quick cut-off valve, and then the nitrogen is cut off.

[0044] Because this process is relatively cumbersome, the cumulative nitrogen purge time required is not less than 200 seconds.

[0045] As Figure 2 shown, the gas ring pipe is connected to the gas spray gun. As Figure 3 shown, the spray gun cooling air ring pipe is connected to the gas spray gun through a check valve.

[0046] The system sets the burnout time mainly to ensure that the residual gas in the combustion cycle is fully burned. At the same time, the main function of nitrogen is in the commutation and burnout time of the gas double-chamber kiln, used to clean the residual gas in the gas ring pipe and the spray gun ring pipe, to avoid the mixture of gas and air and cause combustion explosion.

[0047] Embodiment 1

[0048] As Figure 5 shown, the nitrogen purge device for the gas double-chamber kiln provided in this embodiment. The gas double-chamber kiln includes an A chamber and a B chamber that are interconnected, and includes: 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 arranged in the A chamber and the B chamber. The first gas ring pipe 1 and the second gas ring pipe 2 are respectively used to transmit gas into the A chamber and the B chamber. The gas pipeline 3 is respectively connected to the first gas ring pipe 1 and the second gas ring pipe 2. The nitrogen pipeline 5 is respectively connected to the first gas ring pipe 1 and the second gas ring pipe 2. The spray gun cooling air pipeline 7 is respectively connected to the first gas ring pipe 1 and the second gas ring pipe 2. A gas quick cut-off valve 4 is installed on the gas pipeline 3. A nitrogen purge valve 9 and a first check valve 10 are installed on the nitrogen pipeline 5. A spray gun cooling air quick cut-off valve 8 and a second check valve 11 are installed on the spray gun cooling air pipeline 7.

[0049] The gas pipeline 3 is connected to the first gas loop pipe 1 and the second gas loop pipe 2 through the first pipeline 13 and the second pipeline 12 respectively. The number of gas quick cut valves 4 is three, and the three gas quick cut valves 4 are respectively installed on the gas pipeline 3, the first pipeline 13 and the second pipeline 12; The nitrogen pipeline 5 is connected to the first gas loop pipe 1 and the second gas loop pipe 2 through the third pipeline 14 and the fourth pipeline 6 respectively. The number of nitrogen purging valves 9 and the first check valves 10 is two each. One nitrogen purging valve 9 and one first check valve 10 are installed on the third pipeline 14, and one nitrogen purging valve 9 and one first check valve 10 are installed on the fourth pipeline 6; The spray gun cooling air pipeline 7 is connected to the first gas loop pipe 1 and the second gas loop pipe 2 through the fifth pipeline 15 and the sixth pipeline 16 respectively. The number of spray gun cooling air quick cut valves 8 and the second check valves 11 is two each. 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.

[0050] The connection part of the third pipeline 14 and the first gas loop pipe 1 is the part of the first pipeline 13 between the first gas loop pipe 1 and the gas quick cut valve 4; The connection part of the fourth pipeline 6 and the second gas loop pipe 2 is the part of the second pipeline 12 between the second gas loop pipe 2 and the gas quick cut valve 4; The connection part of the fifth pipeline 15 and the first gas loop pipe 1 is the part of the first pipeline 13 between the first gas loop pipe 1 and the gas quick cut valve 4; The connection part of the sixth pipeline 16 and the second gas loop pipe 2 is the part of the second pipeline 12 between the second gas loop pipe 2 and the gas quick cut valve 4.

[0051] When the A chamber is in the combustion state and the B chamber is in the heat storage state, the gas quick cut valve 4 on the first pipeline 13 is opened, and the gas quick cut valve 4 on the second pipeline 12 is closed; The nitrogen purging valve 9 on the third pipeline 14 is closed, and the nitrogen purging valve 9 on the fourth pipeline 6 is closed; The spray gun cooling air quick cut valve 8 on the fifth pipeline 15 is closed, and the spray gun cooling air quick cut valve 8 on the sixth pipeline 16 is opened.

[0052] 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.

[0053] The A chamber is connected with a combustion air pipe, the combustion air pipe is connected with a combustion air blower, and a combustion air release valve is installed on the combustion air pipe.

[0054] Both the A chamber and the B chamber are connected with cooling air pipes, the cooling air pipes are connected with cooling air blowers, and cooling air release valves are installed on the cooling air pipes; The spray gun cooling air pipe is connected with a spray gun cooling air blower.

[0055] When the A chamber and the B chamber enter the commutation period, the combustion-supporting air release valve and the cooling air release valve open, and the combustion-supporting air and the cooling air in the A chamber and the B chamber are discharged through the combustion-supporting air release valve and the cooling air release valve respectively; the gas quick cut-off valves 4 on the first pipeline 13 and the second pipeline 12 are both closed, the nitrogen purging valves 9 on the third pipeline 14 and the fourth pipeline 6 are both closed, and the quick cut-off valves 8 for the lance cooling air on the fifth pipeline 15 and the sixth pipeline 16 are both open.

[0056] When the B chamber is in the combustion state, the quick cut-off valve 8 for the lance cooling air on the fifth pipeline 15 is in the open state, the quick cut-off valve 8 for the lance cooling air on the sixth pipeline 16 is in the closed state, and the nitrogen purging valve 9 on the fourth pipeline 6 is open; when the pressure in the A chamber and the B chamber reaches 10 kPa, the gas quick cut-off valve 4 on the second pipeline 12 opens, and the nitrogen purging valve 9 on the fourth pipeline 6 closes.

[0057] Embodiment 2

[0058] The purging method of the nitrogen purging device for the gas-fired double-chamber kiln provided in this embodiment uses the nitrogen purging device for the gas-fired double-chamber kiln;

[0059] When the A chamber is in the combustion state and the B chamber is in the heat storage state, the gas quick cut-off valve 4 on the first pipeline 13 opens, and the gas quick cut-off valve 4 on the second pipeline 12 closes; the nitrogen purging valve 9 on the third pipeline 14 closes, and the nitrogen purging valve 9 on the fourth pipeline 6 closes; the quick cut-off valve 8 for the lance cooling air on the fifth pipeline 15 closes, and the quick cut-off valve 8 for the lance cooling air on the sixth pipeline 16 opens to cool the lance of the B chamber;

[0060] When the A chamber is in the burnout state, the gas quick cut-off valve 4 on the first pipeline 13 closes to cut off the gas supply to the A chamber, and the combustion-supporting air blower and the cooling air blower continue to operate to supply the combustion-supporting air and the cooling air; the nitrogen purging valve 9 on the third pipeline 14 opens, and nitrogen is sent to the lance of the A chamber to purge the first gas manifold 1 for 10 - 15 seconds. After the purging is completed, the nitrogen purging valve 9 on the third pipeline 14 closes; the gas quick cut-off valve 4 on the second pipeline 12 closes; the quick cut-off valve 8 for the lance cooling air on the fifth pipeline 15 opens, and the lance cooling air is sent into the first gas manifold 1 to cool the lance of the A chamber through the first gas manifold 1; the quick cut-off valve 8 for the lance cooling air on the sixth pipeline 16 opens;

[0061] When the A chamber and the B chamber enter the commutation period, the combustion-supporting air release valve and the cooling air release valve open, and the combustion-supporting air and the cooling air in the A chamber and the B chamber are discharged through the combustion-supporting air release valve and the cooling air release valve respectively; the gas quick cut-off valves 4 on the first pipeline 13 and the second pipeline 12 are both closed, the nitrogen purging valves 9 on the third pipeline 14 and the fourth pipeline 6 are both closed, and the quick cut-off valves 8 for the lance cooling air on the fifth pipeline 15 and the sixth pipeline 16 are both open;

[0062] When the B chamber is in the combustion state, the quick cut valve 8 of the spray gun cooling air on the fifth pipeline 15 is in the open state. 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 of the spray gun cooling air on the sixth pipeline 16 is in the closed state. The nitrogen purging valve 9 on the fourth pipeline 6 is opened to purge the second gas ring pipe 2. As the combustion-supporting air and the cooling air are blown into the A chamber and the B chamber, when the pressure in the A chamber and the B chamber reaches 10 kPa, the gas quick cut valve 4 on the second pipeline 12 is opened, and the gas is sent to the spray gun through the second gas ring pipe 2. The nitrogen purging valve 9 on the fourth pipeline 6 is closed. During the entire combustion period, the nitrogen purging time is 10 seconds.

[0063] The parts not mentioned in this embodiment are the same as those in Embodiment 1.

[0064] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. Nitrogen purging device for gas-fired double-chamber kiln. The gas-fired double-chamber kiln includes an A chamber and a B chamber that are interconnected. It is characterized in that, Including: The first gas ring pipe, the second gas ring pipe, the nitrogen pipeline, the gas pipeline and the lance cooling air pipeline. The first gas ring pipe and the second gas ring pipe are respectively arranged in the A chamber and the B chamber. The first gas ring pipe and the second gas ring pipe are respectively used for transmitting gas into the A chamber and the B chamber. The gas pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe. The nitrogen pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe. The lance cooling air pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe. A gas quick cut-off valve is installed on the gas pipeline. A nitrogen purge valve and a first check valve are installed on the nitrogen pipeline. A lance cooling air quick cut-off valve and a second check valve are installed on the lance cooling air pipeline.

2. The nitrogen purging device for the gas-fired double-chamber kiln according to claim 1, characterized in that, The gas pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe through the first pipeline and the second pipeline. The number of gas quick cut-off valves is three, and the three gas quick cut-off valves are respectively installed on the gas pipeline, the first pipeline and the second pipeline; The nitrogen pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe through the third pipeline and the fourth pipeline. The number of nitrogen purge valves and the first check valves is two. 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 lance cooling air pipeline is respectively connected to the first gas ring pipe and the second gas ring pipe through the fifth pipeline and the sixth pipeline. The number of lance cooling air quick cut-off valves and the second check valves is two. One lance cooling air quick cut-off valve and one second check valve are installed on the fifth pipeline, and one lance cooling air quick cut-off valve and one second check valve are installed on the sixth pipeline.

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

4. The nitrogen purging device for a gas-fired double-chamber kiln according to claim 2, characterized in that, When the A chamber is in the combustion state and the B chamber is in the heat storage state, the gas quick cut-off valve on the first pipeline is opened, and the gas quick cut-off valve on the second pipeline is closed; The nitrogen purge valve on the third pipeline is closed, and the nitrogen purge valve on the fourth pipeline is closed; The lance cooling air quick cut-off valve on the fifth pipeline is closed, and the lance cooling air quick cut-off valve on the sixth pipeline is opened.

5. The nitrogen purging device for the gas-fired double-shaft kiln according to claim 2, characterized in that, When the A chamber is in the burnout state, the gas quick cut-off valve on the first pipeline is closed, and the nitrogen purge valve on the third pipeline is opened. After the purging is completed, the nitrogen purge valve on the third pipeline is closed; The gas quick cut-off valve on the second pipeline is closed; The lance cooling air quick cut-off valve on the fifth pipeline is opened, and the lance cooling air quick cut-off valve on the sixth pipeline is opened.

6. The nitrogen purging device for the gas-fired double-shaft kiln according to claim 2, wherein The A chamber is connected with a combustion air duct, the combustion air duct is connected with a combustion air blower, and a combustion air release valve is installed on the combustion air duct.

7. The nitrogen purging device for the gas-fired double-shaft kiln according to claim 6, characterized in that, Both the A chamber and the B chamber are connected with cooling air ducts, the cooling air ducts are connected with cooling air blowers, and cooling air release valves are installed on the cooling air ducts; The lance cooling air duct is connected with a lance cooling air blower.

8. The nitrogen purging device for the gas-fired double-chamber kiln according to claim 7, characterized in that, When the A chamber and the B chamber enter the commutation period, the combustion-supporting air release valve and the cooling air release valve open, and the combustion-supporting air and the cooling air in the A chamber and the B chamber are discharged through the combustion-supporting air release valve and the cooling air release valve respectively; the gas quick cut-off 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 quick cut-off valves for the lance cooling air on the fifth pipeline and the sixth pipeline are both open.

9. The nitrogen purging device for the gas-fired double-chamber kiln according to claim 2, characterized in that, When the B chamber is in the combustion state, the quick cut-off valve for the lance cooling air on the fifth pipeline is in the open state, the quick cut-off valve for the lance cooling air on the sixth pipeline is in the closed state, and the nitrogen purge valve on the fourth pipeline is open; when the pressure in the A chamber and the B chamber reaches 10 kPa, the gas quick cut-off valve on the second pipeline opens, and the nitrogen purge valve on the fourth pipeline closes.

10. Purge method of a nitrogen purging device for a gas-fired double-chamber kiln, characterized in that, Adopt the nitrogen purge device for a gas-fired double-chamber kiln according to any one of claims 1-9; When the A chamber is in the combustion state and the B chamber is in the heat storage state, the gas quick cut-off valve on the first pipeline opens, and the gas quick cut-off valve on the second pipeline closes; the nitrogen purge valve on the third pipeline closes, and the nitrogen purge valve on the fourth pipeline closes; the quick cut-off valve for the lance cooling air on the fifth pipeline closes, and the quick cut-off valve for the lance cooling air on the sixth pipeline opens to cool the lance in the B chamber; When the A chamber is in the burnout state, the gas quick cut-off valve on the first pipeline closes to cut off the gas supply to the A chamber, and the combustion-supporting air blower and the cooling air blower continue to operate to supply the combustion-supporting air and the cooling air; the nitrogen purge valve on the third pipeline opens, and nitrogen is sent into the lance of the A chamber to purge the first gas ring pipe for 10-15 seconds. After the purging is completed, the nitrogen purge valve on the third pipeline closes; the gas quick cut-off valve on the second pipeline closes; the quick cut-off valve for the lance cooling air on the fifth pipeline opens to send the lance cooling air into the first gas ring pipe, and through the first gas ring pipe, the lance in the A chamber is cooled; the quick cut-off valve for the lance cooling air on the sixth pipeline opens; When the A chamber and the B chamber enter the commutation period, the combustion-supporting air release valve and the cooling air release valve open, and the combustion-supporting air and the cooling air in the A chamber and the B chamber are discharged through the combustion-supporting air release valve and the cooling air release valve respectively; the gas quick cut-off 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 quick cut-off valves for the lance cooling air on the fifth pipeline and the sixth pipeline are both open; When the B chamber is in the combustion state, the quick cut-off valve for the lance cooling air on the fifth pipeline is in the open state, and the lance cooling air supplied by the lance cooling air blower enters the first gas ring pipe through the lance cooling air duct to cool the lance in the A chamber. The quick cut-off valve for the lance cooling air on the sixth pipeline is in the closed state, and the nitrogen purge valve on the fourth pipeline opens to purge the second gas ring pipe; as the combustion-supporting air and the cooling air are blown into the A chamber and the B chamber, when the pressure in the A chamber and the B chamber reaches 10 kPa, the gas quick cut-off valve on the second pipeline opens, and the gas is sent into the lance through the second gas ring pipe. The nitrogen purge valve on the fourth pipeline closes, and during the entire combustion period, the nitrogen purge time is 10 seconds.

Images