CN111947449B - Gas-fired shaft kiln damping-down and reblowing system and control method - Google Patents

Gas-fired shaft kiln damping-down and reblowing system and control method Download PDF

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Publication number
CN111947449B
CN111947449B CN202010835595.8A CN202010835595A CN111947449B CN 111947449 B CN111947449 B CN 111947449B CN 202010835595 A CN202010835595 A CN 202010835595A CN 111947449 B CN111947449 B CN 111947449B
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valve
gas
pipe
damping
air
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CN111947449A (en
Inventor
张银斌
张兴国
陈永文
唐兵
宾鸿伟
胡显阳
杨勇攀
王国强
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SGIS Songshan Co Ltd
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SGIS Songshan Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/26—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/0005—Cooling of furnaces the cooling medium being a gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The application provides a gas-fired shaft kiln wind returning and returning system and a control method, and relates to the technical field of gas-fired shaft kilns. The gas-fired shaft kiln damping and reblowing system comprises a gas-fired shaft kiln, a gas surrounding pipe, an air surrounding pipe, a nitrogen pipe, a cold air pipe, an induced air pipe and a control system, the control method based on the gas-fired shaft kiln damping and reblowing system can greatly improve the automatic control of damping and reblowing operations, and the linked automatic intelligent operation is realized through background monitoring of the control system, the automatic processing operation of damping and reblowing is realized in a short time, and the automatic and safe kiln stopping can be realized without manual intervention.

Description

Gas-fired shaft kiln damping-down and reblowing system and control method
Technical Field
The application relates to the technical field of gas-fired shaft kilns, in particular to a gas-fired shaft kiln damping-down and recoiling system and a control method.
Background
The gas burning shaft kiln is a shaft kiln which takes gas as fuel and is provided with an upper row of burners and a lower row of burners at the periphery of the middle section of a kiln chamber, and because the low-calorific-value pure blast furnace gas can be utilized, the one-time furnace life of the kiln is longer than that of a rotary kiln, a sleeve kiln and a parallel-flow heat storage double-chamber kiln, the operation rate of equipment is high, the operation cost is low, the investment of products per ton is small and the like, the gas burning shaft kiln is still one of the main kiln types for producing metallurgical lime in the medium and small iron and steel industries.
The height of the gas burning kiln is about 35m, the effective height is about 22m, the inner diameter is 2-4 m, an upper row and a lower row of burners are arranged at the positions of 14m and 16m at the middle lower part of the kiln body, each row is respectively provided with 10 sleeve type burners uniformly arranged along the periphery of the kiln body, the included angle between two adjacent burners in the same row is 36 degrees, and the stagger angle between two adjacent burners in the upper row and the lower row is 18 degrees. The fuel gas and the primary combustion air are sprayed into the kiln through 20 sleeve type burners which are uniformly arranged from a gas surrounding pipe and an air surrounding pipe around the kiln body, and the fuel gas and the combustion air enter the kiln to be mixed and burnt to generate high-temperature flame to roast and decompose limestone.
At present, when the existing gas-fired shaft kiln is planned to be stopped and rewound, manual operation is needed, and because the gas-fired shaft kiln is large in size and a system where the gas-fired shaft kiln is located is large, manual operation needs a worker to continuously rush waves to timely open or close each part, so that the problems of complexity, waste time, waste force and low safety exist, and accidents such as gas poisoning and fire disaster easily occur.
Disclosure of Invention
The application provides a gas-fired shaft kiln damping-down and recoiling system and a control method, which can improve at least one technical problem.
In a first aspect, an embodiment of the present application provides a gas-fired shaft kiln wind returning system, which includes a gas-fired shaft kiln, a gas bustle pipe, an air bustle pipe, a nitrogen pipe, a cold air pipe, an induced draft pipe and a control system.
The gas surrounding pipe is arranged around the gas-fired shaft kiln in the circumferential direction and communicated with the burner of the gas-fired shaft kiln, and is connected with a gas main pipe with a gas valve and a bleeding pipe with a bleeding valve.
The air surrounding pipe is arranged in the circumferential direction of the gas-fired shaft kiln and communicated with the burner of the gas-fired shaft kiln, the air surrounding pipe is connected with a combustion fan through an air pipe, and the air pipe is provided with an air valve.
The nitrogen pipe is communicated with the gas surrounding pipe through a plurality of first branch pipes, each first branch pipe is provided with a first purging valve, the nitrogen pipe is communicated with the air surrounding pipe through a plurality of second branch pipes, and each second branch pipe is provided with a second purging valve.
One end of the cold air pipe is communicated with a cold air inlet of the gas-fired shaft kiln, the other end of the cold air pipe is connected with a cooling fan, and the cold air pipe is provided with a cold air valve.
One end of the induced draft pipe is communicated with a flue gas outlet of the gas-fired shaft kiln, and the other end of the induced draft pipe is connected with an induced draft fan.
The control system is respectively and electrically connected with the gas valve, the bleeding valve, the combustion fan, the air valve, the first purging valve, the second purging valve, the cooling fan, the cold air valve and the draught fan so as to control the running state of each part.
In the implementation process, the control system can accurately control the opening and closing of each valve and the starting or closing of the combustion fan, the cooling fan and the induced draft fan only by setting a specific program in the control system, so that the automatic processing operation of damping down and re-blowing can be realized in a short time, and the automatic and safe kiln stopping can be realized without manual intervention.
Meanwhile, the arrangement of the nitrogen surrounding pipe is more convenient for purging, and the arrangement of the first purging valve and the second purging valve can selectively and respectively purge the gas surrounding pipe and the air surrounding pipe by using nitrogen in the actual damping-down and damping-down control process, so that residual gas (coal gas) after damping-down and redundant oxygen before damping-down are purged completely, the safety accidents of gas explosion are avoided, and the safety performance of a damping-down and damping-down system of the gas-fired vertical kiln is ensured.
In a possible implementation scheme, the induced draft tube, the gas surrounding tube, the air surrounding tube and the cold air tube are respectively provided with a flowmeter and a pressure gauge, the control system is electrically connected with the flowmeters and the pressure gauges respectively to obtain actual flow parameters and actual pressure parameters of all the pipelines, and the control system judges whether the gas-fired vertical kiln damping-down and re-draft system normally operates or not by comparing the actual flow parameters with corresponding target pressure parameters and comparing the actual flow parameters with the corresponding target flow parameters.
In the implementation process, the control system can monitor whether the damping-down and recoiling system of the gas-fired shaft kiln normally operates or not, and then different damping-down operations are carried out according to different results.
In a possible embodiment, the part of the nitrogen gas pipe is arranged around the circumference of the gas-fired shaft kiln to form a nitrogen gas surrounding pipe, the plurality of first branch pipes are distributed at equal intervals along the nitrogen gas surrounding pipe, and the plurality of second branch pipes are distributed at equal intervals along the nitrogen gas surrounding pipe.
In the implementation process, through the arrangement, nitrogen purging efficiency can be effectively guaranteed, and follow-up control system can be guaranteed to rapidly carry out damping-down and re-blowing operations.
In one possible implementation scheme, the gas valve, the cold air valve and the air valve are respectively configured to be closed when power is cut off, the bleeding valve is configured to be opened when power is cut off, and the cutting-off time of the gas valve, the cold air valve, the air valve and the bleeding valve is less than or equal to 1s.
At above-mentioned realization in-process, can guarantee after having a power failure that gas valve, cold-blast valve and air valve are automatic to be closed rapidly, and the valve of diffusing simultaneously is automatic to be opened, realizes preventing the incident because of the urgent damping down that the power failure leads to.
Optionally, the number of gas valves and the number of blow-off valves are each at least two.
In the implementation process, due to the arrangement of the at least two gas valves, after a part of the gas valves go wrong, the part of the gas valves can still work normally, so that the safety is guaranteed while the smooth running of the blowing-down and returning wind is guaranteed, especially the safety in temporary power failure, and the setting benefits of the at least two bleeding valves can be obtained in the same way.
In a second aspect, an embodiment of the present application provides a method for controlling re-blowing of a gas-fired shaft kiln, which is implemented by using the system for controlling re-blowing of a gas-fired shaft kiln provided in the first aspect of the present application, where the method for controlling re-blowing of a gas-fired shaft kiln includes a planned re-blowing control process, and the planned re-blowing control process includes: and the control system controls the gas valve to be closed and the relief valve to be opened, then the air valve and the cold air valve are closed, then the first purging valve and the second purging valve are opened, nitrogen is used for purging the gas surrounding pipe and the air surrounding pipe respectively for 8-15s, then the first purging valve and the second purging valve are closed, the combustion fan and the cooling fan are stopped after the time delay is 40-60s, and the induced draft fan is stopped after the time delay is 40-60 s.
In the implementation process, the control system controls the gas valve to be closed and opens the bleeding valve, so that the burner is flamed out, redundant part of gas is discharged from the bleeding valve, and then the air valve and the cold air valve are closed to prevent the gas from flowing backwards.
And then opening the first purging valve and the second purging valve, respectively purging the gas surrounding pipe and the air surrounding pipe by using nitrogen for 8-15s, then closing the first purging valve and the second purging valve, and purging residual gas in the gas surrounding pipe after damping down, residual oxygen in the air surrounding pipe and redundant oxygen before re-blowing by using nitrogen, thereby completely eradicating gas explosion safety accidents and further improving the safety degree. After the first purging valve and the second purging valve are closed, delaying for 40-60s, stopping the combustion fan and the cooling fan, and after the combustion fan and the cooling fan are stopped, delaying for 40-60s, and stopping the induced draft fan.
In one possible embodiment, the control method includes planning a rebreathing control process, the planning a rebreathing control process including: after the control system controls the draught fan and the cooling fan to be started, the combustion-supporting fan is started after the time delay is 30-40s, the air valve and the cold air valve are started after the time delay is 20-30s, the first purging valve and the second purging valve are opened, the gas surrounding pipe and the air surrounding pipe are purged respectively for 8-15s by using nitrogen, the first purging valve and the second purging valve are closed, and then the gas valve is started and the bleeding valve is closed.
In the implementation process, the safety and the smoothness of the reblowing are ensured through the reasonable planned reblowing control process.
In a possible implementation scheme, the control method comprises a non-power-off emergency damping-down control process, the control system can respectively obtain actual flow parameters and actual pressure parameters of the gas bustle pipe, the air bustle pipe, the cold air pipe and the induced air pipe in real time, the obtained actual parameters are compared with corresponding preset values, and if any parameter is not matched with the corresponding preset value, the emergency damping-down control process is triggered.
The non-power-off emergency damping-down control process comprises the following steps:
and the control system controls the gas valve, the air valve and the cold air valve to be closed and opens the diffusion valve, then opens the first purging valve and the second purging valve, respectively purges the gas surrounding pipe and the air surrounding pipe for 8-15s by using nitrogen, closes the first purging valve and the second purging valve, delays for 40-60s, stops the combustion fan and the cooling fan, delays for 40-60s, and stops the induced draft fan.
In the implementation process, the control system is used for monitoring the pressure and the flow in each pipeline, on the premise of no power failure, when any parameter is not matched with a corresponding preset value, the production operation of the damping-down and reblowing system of the gas-fired vertical kiln is indicated to be out of order, the non-power-failure emergency damping-down control process is triggered to carry out emergency damping-down at the moment, safety accidents are prevented, residual gas in a gas surrounding pipe after damping-down, residual oxygen in an air surrounding pipe and redundant oxygen before reblowing are swept to the greatest extent by using nitrogen, the gas explosion safety accidents are avoided, and the safety degree is further improved.
In one possible embodiment, the control method comprises a power outage emergency stop control process, and the power outage emergency stop control process comprises the following steps:
the gas valve, the air valve, and the cool air valve, which are configured to be closed during a power failure, are closed, and the purge valve, which is configured to be opened during a power failure, is opened.
In the implementation process, because the control method, the induced draft fan, the cooling fan and the combustion fan cannot work in a power failure state, the control method, the induced draft fan, the cooling fan and the combustion fan can be quickly closed by a gas valve, an air valve and a cold air valve which are configured to be closed in a power failure state in advance, and meanwhile, the control method is configured to be quickly opened by a bleeding valve which is opened in the power failure state, so that safety accidents can be effectively avoided.
In a possible embodiment, the pressure in the gas enclosure is 0.5-0.7MPa and the flow rate is 80-120m in the process of respectively purging the gas enclosure and the air enclosure by using nitrogen 3 Min, the pressure in the air surrounding pipe is 0.5-0.7MPa, and the flow is 80-120m 3 /min。
In the implementation process, the good purging effect can be ensured under the parameters, and meanwhile, the safety of the gas surrounding pipe and the air surrounding pipe in the purging process is also ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a blowing-down and blowing-back system of a conventional gas-fired shaft kiln;
FIG. 2 is a schematic structural diagram of a gas-fired shaft kiln damping-down and reblowing system provided by the present application;
FIG. 3 is a schematic structural diagram of a nitrogen enclosure provided herein;
FIG. 4 is a schematic flow chart of a planned damping down control process provided in embodiment 2 of the present application;
FIG. 5 is a schematic flow chart of a planned overfire air control process provided in example 2 of the present application;
fig. 6 is a schematic flow chart of an emergency damping-down control process provided in embodiment 2 of the present application.
An icon: 1 a-a gas burning shaft kiln damping-down and reblowing system; 1 b-a gas burning shaft kiln damping-down and reblowing system; 10-gas burning shaft kiln; 11-a burner; 20-a gas surrounding pipe; 21-gas main pipe; 22-a first gas valve; 23-a second gas valve; 25-a first bleed valve; 27-a second bleed valve; 30-a heat exchanger; 40-air surrounding pipes; 41-air tube; 42-an air valve; 43-combustion-supporting fan; 50-nitrogen enclosure; 52-first purge valve; 55-a second purge valve; 60-a cold air pipe; 61-cold air valve; 63-a cooling fan; 70-an induced draft tube; 73-induced draft fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, in the conventional gas-fired shaft kiln damping-down and reblowing system 1a, when a gas-fired shaft kiln 10 is scheduled to damp down, a firer firstly closes a shut-off valve of a main gas pipe 21 located in front of a gas surrounding pipe 20 and located in front of a heat exchanger 30, manually remotely closes an electric butterfly valve located in front of the quick shut-off valve and located on the main gas pipe 21, then climbs a 14m platform and a 16m platform to manually close 20 gas blocking valves and 20 combustion-supporting gas blocking valves of 20 sleeve-type burners 11 one by one, manually opens a manual bleeding valve located on the gas surrounding pipe 20, then closes outlet valves (not shown) of a combustion-supporting fan 43 and a cooling fan 63, stops the combustion-supporting fan 43 and the cooling fan 63, and finally stops a flue gas induced draft fan 73; when planning to recover the air (resuming production), a fireman firstly starts the induced draft fan 73, the cooling fan 63 and the combustion fan 43, manually opens outlet valves of the combustion fan 43 and the cooling fan 63, opens a stop valve on the main gas pipe 21 in front of the gas surrounding pipe 20, manually remotely opens an electric butterfly valve on the gas pipeline in front of the quick stop valve, then climbs platforms of 14m and 16m, manually opens 20 gas blocking valves and 20 combustion-supporting gas blocking valves of 20 sleeve type burners 11 one by one, and manually closes a manual relief valve on the gas surrounding pipe 20.
In case of emergency such as sudden power failure, tripping of the induced draft fan 73, the combustion fan 43 and the cooling fan 63 (or breakage of a coupler), sudden interruption of gas source, burst of an explosion-proof hole and the like, a fireman needs to quickly close the stop valve on the main gas pipe 21 in front of the gas surrounding pipe 20, manually and remotely close the electric butterfly valve, manually close the gas blocking valve and the combustion-supporting gas blocking valve of the 20 sleeve-type burners 11 one by running platforms of 14m and 16m, and manually open the manual diffusion valve on the gas surrounding pipe 20.
The whole process is complicated, and the application is provided in view of the problem.
It is required to explain that, the valve that each pipeline set up in this application needs to match rather than the pipe diameter of the pipeline that corresponds, and then just can effectively cut off the pipeline, does not do specific unnecessary detail below.
Example 1
Referring to fig. 2, a gas-fired shaft kiln damping and reblowing system 1b includes: the gas-fired shaft kiln 10, the gas surrounding pipe 20, the air surrounding pipe 40, the nitrogen pipe, the cold air pipe 60, the induced draft pipe 70 and a control system (not shown).
The gas-fired shaft kiln 10 is provided with sleeve type burners 11 uniformly arranged along the periphery of a kiln body of the gas-fired shaft kiln 10, and each burner 11 is provided with a gas blocking valve and a combustion-supporting gas blocking valve, wherein the gas blocking valve and the combustion-supporting gas blocking valve are in a normally open state.
The gas surrounding pipe 20 is arranged around the gas-fired shaft kiln 10 and is selectively communicated with each burner 11 through a gas blocking valve, and the gas surrounding pipe 20 is connected with a gas main pipe 21 with a gas valve and a bleeding pipe with a bleeding valve.
Wherein the gas valves comprise a first gas valve 22 and a second gas valve 23, optionally, the gas main 21 can be preheated by the heat exchanger 30, wherein the gas main 21 located before (without heat exchange) the heat exchanger 30 can retain an existing electric butterfly valve and a quick cut valve as the first gas valve 22, and the gas main 21 located behind the heat exchanger 30 is provided with a quick cut valve as the second gas valve 23, wherein the electric butterfly valve can be manually operated after the control system operation fails.
Specifically, the number of the quick-cutting valves as the second gas valve 23 is at least two, for example, two, and the two quick-cutting valves are serially arranged in the gas main pipe 21, so that after one of the quick-cutting valves fails to work normally, the other quick-cutting valve can also work normally.
Each of the quick-cut valves as the second gas valves 23 is configured to be closed during a power failure and to have a shut-off time of not more than 1s, that is, each of the quick-cut valves is automatically closed after the power failure and to have a shut-off time of not more than 1s.
The bleeding pipe comprises an original first bleeding pipe and a newly added second bleeding pipe, the bleeding valve comprises an original manual bleeding valve and a newly added electromagnetic bleeding valve, the manual bleeding valve is arranged in the first bleeding pipe and is in a normally closed state to serve as the first bleeding valve 25 for manual operation after the electromagnetic bleeding valve fails, the electromagnetic bleeding valve is arranged in the second bleeding pipe to serve as the second bleeding valve 27 and can perform related operation according to requirements, and optionally, the electromagnetic bleeding valve can be provided with position control.
Wherein the number of the second bleeding valves 27 is at least two, for example, two, and two second bleeding valves 27 are connected in parallel to the second bleeding pipe.
The air surrounding pipe 40 is arranged around the gas-fired shaft kiln 10 and is selectively communicated with the burner 11 of the gas-fired shaft kiln 10 through an air blocking valve, the air surrounding pipe 40 is connected with a combustion fan 43 through an air pipe 41, and the air pipe 41 is provided with an air valve 42. Wherein, the portion of the air pipe 41 between the combustion fan 43 and the air valve 42 can be preheated by the heat exchanger 30.
Wherein the air valve 42 is configured to be closed when power is off, and the cut-off time is less than or equal to 1s.
Referring to fig. 2 and 3, a portion of the nitrogen pipe is disposed around the gas-fired shaft kiln 10 to form a nitrogen shroud 50, the nitrogen shroud 50 is communicated with the gas shroud 20 through a plurality of first branches, each of the first branches is provided with a first purge valve 52, the nitrogen shroud 50 is communicated with the air shroud 40 through a plurality of second branches, and each of the second branches is provided with a second purge valve 55. Through the setting of nitrogen gas surrounding pipe 50, a plurality of second branch pipe and a plurality of first branch pipe, effectively improve and sweep efficiency, and then reduce and sweep required time, guarantee to have a rest and recover wind operation and accomplish in the short time fast.
The number of the first branch pipes and the number of the second branch pipes are in one-to-one correspondence, for example, two, three, five, and the like.
Specifically, the number of the first branch pipes and the number of the second branch pipes are four, wherein the four first branch pipes are equidistantly and alternately distributed along the nitrogen gas surrounding pipe 50, the four second branch pipes are equidistantly and alternately distributed along the nitrogen gas surrounding pipe 50, and specifically, when each first branch pipe and the corresponding second branch pipe are taken as a group of branch pipes, the four groups of branch pipes are rotationally and symmetrically distributed on the nitrogen gas surrounding pipe 50.
One end of the cold air pipe 60 is communicated with a cold air inlet of the gas-fired shaft kiln 10, the other end of the cold air pipe 60 is connected with a cooling fan 63, and the cold air pipe 60 is provided with a cold air valve 61. Wherein, the cold air valve 61 is configured to be closed when power is cut off, and the cut-off time is less than or equal to 1s.
One end of the induced draft pipe 70 is communicated with the flue gas outlet of the gas-fired shaft kiln 10, and the other end is connected with an induced draft fan 73.
The control system is respectively and electrically connected with the first gas valve 22, the second gas valve 23, the second bleeding valve 27, the combustion fan 43, the air valve 42, the first purging valve 52, the second purging valve 55, the cooling fan 63, the cold air valve 61 and the induced draft fan 73 so as to control the operation state of each component. Meanwhile, whether the cooling fan 63, the induced draft fan 73, the combustion fan 43 and the like are operated or not can be monitored.
The control system is a PLC control system, and can monitor the operating states of the components through the above-mentioned setting, and control the operating states of the components, for example, the operating state of the cooling fan 63 that is turned on is switched to the off state (i.e., stopped operation), the cooling valve 61 is switched from the on state to the off state, and the like.
The control system is connected with an operation panel, related options are input through the operation panel, and the control system carries out related blowing-down and blowing-back operations according to the input options. Specifically, for example, on the main screen of the main control computer of the control system, relevant windows for the operation of damping down and reblowing are installed.
Optionally, the induced draft tube 70, the gas shroud tube 20, the air shroud tube 40 and the cold air tube 60 are all provided with a flow meter (not shown) and a pressure meter (not shown), the control system is electrically connected with the flow meter and the pressure meter respectively to obtain an actual flow parameter and an actual pressure parameter of each pipeline, the control system judges whether the gas-fired vertical kiln damping-down and re-blowing system is normal by comparing the actual flow parameter with a corresponding target pressure parameter and the actual flow parameter with a corresponding target flow parameter, and by using the above settings, whether related operations are needed to be performed can be judged, and safety accidents are avoided.
A gas-fired shaft kiln 10 damping-down and wind-returning control method implemented by the gas-fired shaft kiln damping-down and wind-returning system comprises the following steps: a planned damping down control process, a planned re-wind control process, a non-power-off emergency damping down control process and a power-off emergency damping down control process.
The planned damping-down control process comprises the following steps:
the control system controls the gas valve to be closed and opens the second bleeding valve 27, then closes the air valve 42 and the cold air valve 61, then opens the first purge valve 52 and the second purge valve 55, respectively purges the gas bustle pipe 20 and the air bustle pipe 40 for 8-15s by using nitrogen, closes the first purge valve 52 and the second purge valve 55, delays for 40-60s, then stops the combustion fan 43 and the cooling fan 63, and delays for 40-60s, then stops the induced draft fan 73.
In the process of respectively purging the gas bustle pipe 20 and the air bustle pipe 40 by using nitrogen, the pressure in the gas bustle pipe 20 is 0.5-0.7MPa, and the flow rate is 80-120m 3 Min, the pressure in the air surrounding pipe 40 is 0.5-0.7MPa, and the flow is 80-120m 3 /min。
Optionally, the planned headwind control process comprises: after the induced draft fan 73 and the cooling fan 63 are controlled by the control system to be started, the combustion-supporting fan 43 is started after delaying for 30-40s, the air valve 42 and the cold air valve 61 are started after delaying for 20-30s, the first purging valve 52 and the second purging valve 55 are opened, nitrogen is used for purging the gas surrounding pipe 20 and the air surrounding pipe 40 for 8-15s respectively, the first purging valve 52 and the second purging valve 55 are closed, and then the gas valve is started and the second bleeding valve 27 is closed.
Optionally, the non-power-off emergency damping-down control process includes:
the control system controls the gas valve, the air valve 42 and the cold air valve 61 to be closed and opens the second blow-off valve 27, the first blow-off valve 52 and the second blow-off valve 55 are closed after the gas surrounding pipe 20 and the air surrounding pipe 40 are respectively blown by nitrogen for 8-15s in the non-power-off state, the combustion fan 43 and the cooling fan 63 are stopped after the time delay is 40-60s, and the induced draft fan 73 is stopped after the time delay is 40-60 s.
Wherein, in the process of respectively purging the gas bustle pipe 20 and the air bustle pipe 40 by using nitrogen, the pressure in the gas bustle pipe 20 is 0.5-0.7MPa, and the flow rate is 80-120m 3 Min, the pressure in the air surrounding pipe 40 is 0.5-0.7MPa, and the flow rate is 80-120m 3 /min。
The triggering basis of the non-power-off emergency damping-down control process is as follows:
the control system can respectively obtain the actual flow parameters and the actual pressure parameters of the gas bustle pipe 20, the air bustle pipe 40, the cold air pipe 60 and the induced air pipe 70 in real time, compare the obtained actual parameters with corresponding preset values, and trigger the emergency damping down control process if any parameter is not matched with the corresponding preset value.
The factors causing the change of the parameters comprise: sudden power failure, sudden drop of fan flow and pressure caused by tripping (or broken coupling) of the induced draft fan 73, the cooling fan 63 or the combustion fan 43, sudden drop of gas flow and pressure caused by sudden interruption of gas source, sudden drop of gas flow and pressure caused by explosion of an explosion-proof hole, rise of gas and air (including combustion air and cooling air) flow, pressure drop and other emergency situations.
In order to ensure the timeliness of starting the non-power-off emergency damping-down process, in the actual operation process, a relevant program for controlling the emergency damping-down process is installed and operated in a background of a control system.
Optionally, the power outage emergency damping-down control process includes:
the gas valve, the air valve 42, and the cool air valve 61, which are configured to be closed during a power failure, are closed, and the second purge valve 27, which is configured to be opened during a power failure, is opened.
Example 2
The method for controlling the damping down and the damping down of the gas-fired vertical kiln, which is specifically described in the embodiment 1, is operated by taking the damping down and damping down system of the gas-fired vertical kiln as a frame.
Wherein, the pipe diameter of the nitrogen surrounding pipe is phi 150. Setting parameters of nitrogen purging of the gas surrounding pipe and the air surrounding pipe during planned damping down and emergency damping down: pressure 0.5MPa, flow 80m 3 Min, purge time 10s.
An automatic control program is programmed by utilizing an original control system of the gas burning kiln: referring to fig. 4, when the "planned damping" key is pressed to trigger the planned damping process, the PLC sends an instruction to automatically close the gas valve and open the second bleeding valve within 5s, then close the air valve and the cold air valve within 5s, open the first purge valve and the second purge valve, purge the gas pipe and the air pipe for 10s each, close the first purge valve and the second purge valve, delay for 60s, stop the combustion fan and the cooling fan, and stop the flue gas induced draft fan after further delay for 60 s.
Referring to fig. 5, when the "plan re-air" key is pressed to trigger the plan re-air process, the PLC sends a command to start the induced draft fan and the cooling fan within 30s, start the combustion fan after delaying for 30-40s, automatically start the air valve and the cold air valve after delaying for 25s, open the first purge valve and the second purge valve, respectively purge the gas pipe and the air pipe for 10s by using nitrogen, close the first purge valve and the second purge valve, then start the gas valve, and immediately close the second purge valve.
An automatic control program is programmed by using the original control system of the gas burning kiln: referring to fig. 6, when actual flow parameters and actual pressure parameters of the gas pipe, the air pipe, the cold air pipe and the induced draft pipe are not matched with preset values corresponding to the parameters suddenly due to non-power failure, an emergency damping control process is triggered, wherein the gas valve, the air valve and the cold air valve are automatically closed within 5s, meanwhile, the second blow-off valve is automatically opened, the first blow-off valve and the second blow-off valve are opened, the gas pipe and the air pipe are blown for 10s, the first blow-off valve and the second blow-off valve are closed, the combustion-supporting fan and the cooling fan are stopped after 60s of delay, and the flue gas induced draft fan is stopped after 60s of delay.
Example 3
The method for controlling the damping down and the damping down of the gas-fired vertical kiln, which is specifically described in the embodiment 1, is operated by taking the damping down and damping down system of the gas-fired vertical kiln as a frame.
Wherein, the pipe diameter of the nitrogen gas surrounding pipe is phi 200. Setting parameters of nitrogen purging of the gas surrounding pipe and the air surrounding pipe during planned damping down and emergency damping down: pressure 0.6MPa, flow 100m 3 Min, purge time 9s.
An automatic control program is programmed by utilizing an original control system of the gas burning kiln: when a 'plan damping down' key is pressed to trigger a plan damping down process, the PLC sends an instruction to automatically close a gas valve and open a second bleeding valve within 6s, then close an air valve and a cold air valve within 6s, open a first purging valve and a second purging valve, purge a gas surrounding pipe and an air surrounding pipe for 9s respectively, close the first purging valve and the second purging valve, delay for 60s, stop a combustion fan and a cooling fan, and delay for 60s and stop a flue gas induced draft fan; when a 'plan re-air' key is pressed, a plan re-air process is triggered, the PLC sends an instruction to start the induced draft fan and the cooling fan within 30s, the combustion fan is started after delaying for 30-40s, the air valve and the cold air valve are automatically started after delaying for 25s, the first purging valve and the second purging valve are opened, the gas surrounding pipe and the air surrounding pipe are purged for 9s respectively by using nitrogen, the first purging valve and the second purging valve are closed, the gas valve is opened again, and the second bleeding valve is closed immediately.
An automatic control program is programmed by using the original control system of the gas burning kiln: when actual flow parameters and actual pressure parameters of a coal gas bustle pipe, an air bustle pipe, a cold air pipe and an induced draft pipe which are suddenly caused by non-power failure are not matched with preset values corresponding to the parameters, an emergency damping control process is triggered, wherein the coal gas valve, the air valve and the cold air valve can be automatically closed in 5s, meanwhile, the second diffusion valve can be automatically opened, in a non-power failure state, the control system controls to open the first purging valve and the second purging valve, the coal gas bustle pipe and the air bustle pipe are purged for 9s, the first purging valve and the second purging valve are closed, a combustion-supporting fan and a cooling fan are stopped after 60s of time delay, and a flue gas induced draft fan is stopped after 60s of time delay.
Example 4
It differs from example 3 only in that: setting parameters of a gas bustle pipe and an air bustle pipe purged by nitrogen when the planned damping down and the emergency damping down are carried out: pressure 0.7MPa, flow 120m 3 Min and purging time 6s.
When a 'planned damping down' key is pressed, the PLC sends an instruction to automatically close a gas valve and open a second diffusion valve within 5s, then close an air valve and a cold air valve within 5s, open a first purging valve and a second purging valve, purge the gas surrounding pipe and the air surrounding pipe for 6s respectively, close the first purging valve and the second purging valve, delay for 50s, stop a combustion fan and a cooling fan, and delay for 50s and stop a flue gas induced draft fan; when a 'plan re-air' key is pressed, the PLC sends an instruction to start the induced draft fan and the cooling fan within 30s, the combustion-supporting fan is started after the delay of 30s, the air valve and the cold air valve are automatically started after the delay of 25s, the first purging valve and the second purging valve are opened, the gas surrounding pipe and the air surrounding pipe are purged for 6s respectively by using nitrogen, the first purging valve and the second purging valve are closed, the gas valve is opened again, and the second bleeding valve is closed immediately.
In conclusion, the gas-fired shaft kiln damping-down and re-blowing system and the control method thereof can greatly improve automatic control of damping-down and re-blowing operations, realize chain automatic intelligent operation through background monitoring of the control system, and realize automatic and safe kiln shutdown without manual intervention after emergency damping-down is finished in a short time.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (2)

1. A gas-fired shaft kiln damping-down and damping-down control method implemented by a gas-fired shaft kiln damping-down and damping-down system is characterized in that the gas-fired shaft kiln damping-down and damping-down system comprises:
a gas-fired shaft kiln;
the gas surrounding pipe is arranged around the gas-fired shaft kiln and communicated with the burner of the gas-fired shaft kiln, and the gas surrounding pipe is connected with a gas main pipe with a gas valve and a bleeding pipe with a bleeding valve;
the air surrounding pipe is arranged around the gas-fired shaft kiln and communicated with the burner of the gas-fired shaft kiln, and is connected with a combustion fan through an air pipe, and the air pipe is provided with an air valve;
the nitrogen pipe is communicated with the gas surrounding pipe through a plurality of first branch pipes, each first branch pipe is provided with a first purging valve, the nitrogen pipe is communicated with the air surrounding pipe through a plurality of second branch pipes, and each second branch pipe is provided with a second purging valve; the number of the first branch pipes and the number of the second branch pipes are in one-to-one correspondence, part of the nitrogen pipes are arranged around the circumference of the gas-fired shaft kiln to form nitrogen enclosing pipes, the plurality of first branch pipes are distributed at equal intervals along the nitrogen enclosing pipes, and the plurality of second branch pipes are distributed at equal intervals along the nitrogen enclosing pipes;
one end of the cold air pipe is communicated with a cold air inlet of the gas-fired shaft kiln, the other end of the cold air pipe is connected with a cooling fan, and the cold air pipe is provided with a cold air valve;
one end of the induced draft pipe is communicated with a flue gas outlet of the gas-fired shaft kiln, and the other end of the induced draft pipe is connected with an induced draft fan; and
the control system is respectively and electrically connected with the gas valve, the bleeding valve, the combustion fan, the air valve, the first purging valve, the second purging valve, the cooling fan, the cold air valve and the induced draft fan so as to control the running state of each part;
the control method comprises a planned damping-down control process, wherein the planned damping-down control process comprises the following steps:
the control system controls the gas valve to be closed and opens the bleeding valve, then closes the air valve and the cold air valve, opens the first purging valve and the second purging valve, respectively purges the gas surrounding pipe and the air surrounding pipe for 8-15s by using nitrogen, closes the first purging valve and the second purging valve, delays for 40-60s, stops the combustion fan and the cooling fan, delays for 40-60s, and stops the induced draft fan;
the control method comprises a non-power-off emergency damping-down control process, wherein the control system can respectively obtain actual flow parameters and actual pressure parameters of the gas bustle pipe, the air bustle pipe, the cold air pipe and the induced draft pipe in real time, compare the obtained actual parameters with corresponding preset values, and trigger the emergency damping-down control process if any parameter is not matched with the corresponding preset value;
the non-power-off emergency damping-down control process comprises the following steps:
the control system controls the gas valve, the air valve and the cold air valve to be closed and opens the bleeding valve, then opens the first purging valve and the second purging valve, respectively purges the gas surrounding pipe and the air surrounding pipe for 8-15s by using nitrogen, then closes the first purging valve and the second purging valve, delays for 40-60s, stops the combustion fan and the cooling fan, and delays for 40-60s, and then stops the induced draft fan;
the gas valve, the cold air valve and the air valve are respectively configured to be closed when power fails, the bleeding valve is configured to be opened when power fails, the cutting-off time of the gas valve, the cold air valve, the air valve and the bleeding valve is less than or equal to 1s, and the number of the gas valves and the number of the bleeding valves are at least two;
the control method comprises a power-off emergency damping-down control process, and the power-off emergency damping-down control process comprises the following steps:
the gas valve, the air valve, and the cold air valve configured to be closed in the event of a power failure are closed, while the purge valve configured to be opened in the event of a power failure is opened; in the process of respectively purging the gas surrounding pipe and the air surrounding pipe by using nitrogen, the pressure in the gas surrounding pipe is 0.5-0.7MPa, and the flow is 80-120m 3 /min，The pressure in the air surrounding pipe is 0.5-0.7MPa, and the flow rate is 80-120m 3 /min；
The control method comprises a planned compound wind control process, and the planned compound wind control process comprises the following steps: after control system control draught fan and cooling blower opened, opened combustion-supporting fan after delaying 30-40s, opened after delaying 20-30s again the air valve with the cold-blast valve is opened again first blow sweep the valve with the second sweeps the valve, utilize nitrogen gas to sweep respectively the coal gas surrounding pipe the air surrounding pipe each 8-15s, close first blow sweep the valve with the second sweeps the valve, then open the coal gas valve and close the valve of diffusing.
2. The gas-fired shaft kiln damping-down and damping-down control method according to claim 1, wherein the induced duct, the gas surrounding pipe, the air surrounding pipe and the cold air pipe are respectively provided with a flow meter and a pressure meter, the control system is electrically connected with the flow meter and the pressure meter respectively to obtain an actual flow parameter and an actual pressure parameter of each pipeline, and the control system judges whether the gas-fired shaft kiln damping-down and damping-down system normally operates by comparing the actual flow parameter with a corresponding target pressure parameter and comparing the actual flow parameter with a corresponding target flow parameter.
CN202010835595.8A 2020-08-19 2020-08-19 Gas-fired shaft kiln damping-down and reblowing system and control method Active CN111947449B (en)

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CN113581055B (en) * 2021-08-02 2022-10-14 广东韶钢松山股份有限公司 Anti-blocking device and double-pressure tank car
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CN111302675A (en) * 2020-04-27 2020-06-19 垣曲县五龙镁业有限责任公司 Method and system for calcining dolomite in heat accumulating type energy-saving double-hearth shaft kiln

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