Monitoring system and monitoring method for ammonia gas kiln

Abstract

The monitoring system comprises an ammonia gas detector, a controller, a gas pump, an electric preset valve, an electric channel valve, gas gathering discs and a gas bin, the gas bin is of a closed cavity structure, the gas bin is connected with the gas gathering discs through pipelines, the gas gathering discs are located at different positions of the ammonia gas kiln, and the gas gathering discs are connected with the controller. An electric channel valve is arranged at the end, close to the gas bin, of the corresponding pipeline of each gas gathering disc, the gas bin is connected with one end of an ammonia gas detector through a pipeline, the other end of the ammonia gas detector is connected with an exhaust port through a pipeline, a gas pump is arranged on the pipeline between the gas bin and the ammonia gas detector, and the gas bin is connected with one end of an electric preset valve through a pipeline. The other end of the electric preset valve is connected to the medium gas inlet; the controller is electrically connected to the ammonia gas detector, the gas pump, the electric preset valve and the electric channel valve respectively; the system can monitor the ammonia gas kiln, and has the advantages of high efficiency, low cost and high accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia kiln monitoring, and in particular to a monitoring system and a monitoring method for an ammonia kiln. Background Art

[0002] There are few application cases of kilns that use ammonia combustion (referred to as ammonia kilns) in China. In the past, independent ammonia sensors (including ammonia detectors and other similar equipment) were usually used to detect the leakage concentration of ammonia in the air for the purpose of alarm and water spraying. However, in the application of ammonia kilns, since the length of tile kilns is generally long (due to the process requirements of firing ceramics, mass production standard kilns generally need to be up to about 100 meters), and because a large number of combustion nozzles are required inside the ammonia kiln to achieve effective combustion of ammonia, the ammonia delivery pipeline is relatively long.

[0003] If independent ammonia sensors are used to monitor the ammonia leakage status of ammonia kilns, a large number of independent ammonia sensors are required. For example, if one sensor is set up every 2.5 meters, if sensors are required on both sides of the kiln, an ammonia kiln with a length of 100 meters will require 80 ammonia sensors, resulting in increased investment. The measurement method of ammonia sensors generally adopts the principle of electrochemistry. The collected gas concentration can generally be detected at a level of 0-100ppm, while the human sense of smell can achieve a concentration recognition of 0-10ppm. The detection components of ammonia sensors generally fail in a cycle of 2 years and need to be calibrated or replaced. Therefore, independent ammonia sensors are relatively expensive in cost. At the same time, the installation of ammonia sensors is generally located above the kiln, and the distance from the pipeline is generally about 2 meters, which will reduce the sensitivity and accuracy of detection. Summary of the invention

[0004] The object of the present invention is to provide a monitoring system and a monitoring method for an ammonia kiln, which can monitor the ammonia kiln and has the advantages of high efficiency, low cost and high accuracy.

[0005] To achieve this object, the present invention adopts the following technical solutions: A monitoring system for an ammonia kiln is provided, comprising: an ammonia detector, a controller, an air pump, an electric preset valve, an electric channel valve, a gas collecting plate and a gas bin, wherein the gas bin is a closed cavity structure, and the gas bin is respectively connected to a plurality of the gas collecting plates through pipelines, the gas collecting plates are located at different positions of the ammonia kiln, and the electric channel valve is arranged at one end of the corresponding pipeline of each gas collecting plate close to the gas bin, the gas bin is connected to one end of the ammonia detector through a pipeline, and the other end of the ammonia detector is connected to an exhaust port through a pipeline, the air pump is arranged on the pipeline between the gas bin and the ammonia detector, the gas bin is connected to one end of the electric preset valve through a pipeline, and the other end of the electric preset valve is connected to a medium gas inlet, and the controller is respectively electrically connected to the ammonia detector, the air pump, the electric preset valve and the electric channel valve.

[0006] As a preferred solution for the monitoring system of an ammonia kiln, a throttle valve is provided in the pipeline between the ammonia detector and the air pump.

[0007] As a preferred solution for the monitoring system of the ammonia kiln, a flow meter is provided in the pipeline between the ammonia detector and the exhaust port, and the flow meter is electrically connected to the controller.

[0008] As a preferred solution for the monitoring system of an ammonia kiln, there are two air pumps, and the two air pumps are connected in parallel between the gas bin and the ammonia detector through a pipeline.

[0009] As a preferred solution for the monitoring system of the ammonia kiln, it includes an alarm, and the alarm is electrically connected to the controller.

[0010] As a preferred solution for the monitoring system of an ammonia kiln, the gas collecting disk is an inverted truncated cone structure, a connecting port for connecting a pipeline is provided above the gas collecting disk, and a plurality of air intake ports are respectively provided on the bottom and side walls of the gas collecting disk, and the air intake ports are connected to the connecting ports.

[0011] As a preferred solution for the monitoring system of the ammonia kiln, the connecting port and the air inlet are respectively provided with filter screens, and the gas collecting disk is filled with dust-proof filter cotton.

[0012] The present invention also provides a monitoring method for the monitoring system for an ammonia kiln as described in any one of the above items, comprising the following steps: Activate the ammonia detector; Close the electric channel valves corresponding to all gas collecting plates, start the electric preset valve and air pump for a while, and exhaust the impurity gas in the air warehouse through the medium gas; The electric channel valve corresponding to the first gas collecting disk is opened, and the electric channel valves corresponding to other gas collecting disks are closed. The air pump is started for a period of time to extract the gas at the first gas collecting disk. The extracted gas is passed through a dynamic ammonia detector for ammonia detection, and the environmental monitoring at the first gas collecting disk is completed; Close the electric channel valves corresponding to all gas collecting plates, start the electric preset valve and air pump for a while, and exhaust the impurity gas in the air warehouse through the medium gas; The electric channel valve corresponding to the second gas collecting disk is opened, and the electric channel valves corresponding to other gas collecting disks are closed. The air pump is started for a period of time to extract the gas at the second gas collecting disk. The extracted gas is passed through a dynamic ammonia detector for ammonia detection, and the environmental monitoring at the second gas collecting disk is completed; The cycle is repeated until the environmental monitoring of all gas collecting plates is completed, and then the cycle is repeated for continuous monitoring.

[0013] As a preferred solution for the monitoring method of an ammonia kiln, the start-up time of the gas collecting plate corresponding to the air pump is determined according to the length of the pipeline connecting the gas collecting plate to the gas bin.

[0014] Beneficial effects of the present invention: The monitoring system and monitoring method for an ammonia kiln proposed in the present invention connect the gas bin to the gas collecting disks at different positions of the ammonia kiln through pipes of different lengths, and cleverly cooperate with the electric preset valve and the electric channel valve of each gas collecting disk to perform monitoring switching, and utilize the active air suction method of the air pump to realize cyclic monitoring of different positions of the ammonia kiln, and only one ammonia detector is required, which has the advantages of high efficiency, low cost and high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a system diagram of a monitoring system for an ammonia kiln according to an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a monitoring system for an ammonia kiln according to an embodiment of the present invention; Figure 3 is a front view of a gas collecting disk according to an embodiment of the present invention; Figure 4 is a bottom view of a gas collecting plate according to an embodiment of the present invention; Figure 5 is a top view of a gas collecting disk according to an embodiment of the present invention; Figure 6is a cross-sectional view of a gas collecting disk according to an embodiment of the present invention; In the figure: 1. Ammonia detector; 2. Controller; 3. Air pump; 4. Electric preset valve; 5. Electric channel valve; 6. Gas collecting plate; 601. Connection port; 602. Air intake port; 7. Gas chamber; 8. Throttle valve; 9. Flow meter; 10. Alarm. DETAILED DESCRIPTION

[0017] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0018] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0019] Reference Figure 1-Figure 2 An embodiment of the present invention provides a monitoring system for an ammonia kiln, comprising: an ammonia detector 1, a controller 2, an air pump 3, an electric preset valve 4, an electric channel valve 5, a gas collecting disk 6 and a gas bin 7, wherein the gas bin 7 is a closed cavity structure, and the gas bin 7 is respectively connected to a plurality of the gas collecting disks 6 through pipelines, and the gas collecting disks 6 are located at different positions of the ammonia kiln, and the electric channel valve 5 is arranged at one end of the corresponding pipeline of each gas collecting disk 6 close to the gas bin 7, the gas bin 7 is connected to one end of the ammonia detector 1 through a pipeline, and the other end of the ammonia detector 1 is connected to an exhaust port through a pipeline, the pipeline between the gas bin 7 and the ammonia detector 1 is provided with the air pump 3, the gas bin 7 is connected to one end of the electric preset valve 4 through a pipeline, and the other end of the electric preset valve 4 is connected to the medium gas inlet, and the controller 2 is respectively electrically connected to the ammonia detector 1, the air pump 3, the electric preset valve 4 and the electric channel valve 5.

[0020] Specifically, the connection between the gas tank 7 and the pipeline adopts a pipeline through-plate joint, which is equipped with a leak-proof fluororubber sealing ring, a stainless steel spring and a stainless steel pressure cap to meet the quick plug-in and pull-out of the stainless steel gas pipe; the controller 2 adopts a touch screen all-in-one machine with a built-in configuration web server, 8DI, 8DO, 4AI, 4AO and 2*RS485, supports logic ladder control programs and historical data storage, and the relay supports optocoupler isolation, PID algorithm control, Modbus RTU protocol, etc. The ammonia detector 1 is used for gas analysis. The ammonia detector 1 can be equipped with a signal output 4-20mA or Modbus RTU RS485 signal format transmission, and connected to a touch screen all-in-one machine to realize signal acquisition and analysis of gas concentration. The air pump 3 adopts an air pump structure with controllable flow rate. It is controlled by a touch screen all-in-one controller. The maximum flow rate of the air pump can reach 8L / min, which can meet the different application length requirements of the collection air pipe.

[0021] In the above technical solution, the gas bin 7 is connected to the gas collecting disks 6 at different positions of the ammonia kiln through pipes of different lengths, and the electric preset valve 4 and the electric channel valve 5 of each gas collecting disk 6 are cleverly coordinated for monitoring and switching. The air pump 3 is used to actively suck air to achieve cyclic monitoring of different positions of the ammonia kiln, and only one ammonia detector 1 is required, which has the advantages of high efficiency, low cost and high accuracy.

[0022] In some embodiments, a throttle valve 8 is provided in the pipeline between the ammonia detector 1 and the air pump 3. The throttle valve 8 is used to stabilize the gas flow rate of the ammonia detector 1 at a certain flow rate, such as 0.5 L / min, to ensure the analysis accuracy of the ammonia detector 1.

[0023] In some embodiments, a flow meter 9 is provided in the pipeline between the ammonia detector 1 and the exhaust port, and the flow meter 9 is electrically connected to the controller 2. The flow meter 9 is used to collect the flow of gas and transmit its signal to the touch screen integrated machine controller 1 to realize the collection and display of the flow.

[0024] The controller 2 realizes stable control of the gas collection flow rate through the linkage control of the flow meter 9 and the throttle valve 8.

[0025] In some embodiments, the number of the air pumps 3 is two, and the two air pumps 3 are connected in parallel between the air chamber 7 and the ammonia detector 1 through a pipeline. The two air pumps 3 are used as one for use and one for backup, so as to avoid that one of the air pumps 3 is damaged and the whole system cannot operate normally, or when the air pumping volume of one air pump 3 cannot reach the measured flow rate of the ammonia detector 1, two air pumps are automatically put into use as supplements.

[0026] In some embodiments, an alarm 10 is included, and the alarm 10 is electrically connected to the controller 2. The alarm 10 is used to give an alarm reminder when ammonia is detected.

[0027] Reference Figure 3-Figure 6 In some embodiments, the gas collecting disk 6 is an inverted truncated cone structure, a connection port 601 for connecting a pipeline is provided on the top of the gas collecting disk 6, and a plurality of air inlets 602 are respectively provided on the bottom and side wall of the gas collecting disk 6, and the air inlets 602 are connected to the connection port 601. In this embodiment, the gas collecting disk 6 adopts an all-round sampling and air inlet structure, which can improve the rationality of the sampled gas and ensure the scientific nature of the sampled gas.

[0028] Furthermore, the connection port 601 and the air inlet 602 are respectively provided with filter screens, and the air collecting disk 6 is filled with dustproof filter cotton. The structural design of this embodiment can effectively filter dust in the air, prevent dust from entering the system, and ensure stable and accurate system monitoring.

[0029] An embodiment of the present invention further provides a monitoring method for the monitoring system for an ammonia kiln described in any of the above embodiments, comprising the following steps: S1: Start ammonia detector 1; S2: Close the electric channel valves 5 corresponding to all gas collecting disks 6, start the electric preset valve 4 and the air pump 3 for a period of time, and exhaust the impurity gas in the air warehouse 7 through the medium gas; S3: Open the electric channel valve 5 corresponding to the first gas collecting disk 6, close the electric channel valves 5 corresponding to other gas collecting disks 6, start the air pump 3 for a period of time, extract the gas at the first gas collecting disk 6, and pass the extracted gas through the dynamic ammonia detector 1 for ammonia detection to complete the environmental monitoring of the first gas collecting disk 6; S4: Close the electric channel valves 5 corresponding to all gas collecting disks 6, start the electric preset valve 4 and the air pump 3 for a period of time, and exhaust the impurity gas in the air warehouse 7 through the medium gas; S5: Open the electric channel valve 5 corresponding to the second gas collecting disk 6, close the electric channel valves 5 corresponding to other gas collecting disks 6, start the air pump 3 for a period of time, extract the gas at the second gas collecting disk 6, and pass the extracted gas through the dynamic ammonia detector 1 for ammonia detection to complete the environmental monitoring of the second gas collecting disk 6; S6: The process is circulated in sequence until the environmental monitoring of all gas collecting disks 6 is completed, and then the process is circulated again for continuous monitoring.

[0030] The start-up time of the gas collecting plate 6 corresponding to the air pump 3 is determined according to the length of the pipeline connecting the gas collecting plate 6 to the gas warehouse 7.

[0031] Specifically: Control logic design of controller 2 (1) Engineering quantity setting: 1. Take four collection points and the length of the stainless steel gas pipe from the gas collecting plate 6 to the electric channel valve 5: L1, L2, L3, L4, in meters; 2. The inner diameter of the stainless steel air pipe is φ=8mm; 3. I / O port for controlling the opening of 1# electric channel valve 5: DO1; 4. I / O port for controlling the opening of 2# electric channel valve 5: DO2; 5. I / O port for controlling the opening of 3# electric channel valve 5: DO3; 6. I / O port for controlling the opening of 4# electric channel valve 5: DO4; 7. I / O port for controlling the opening of electric preset valve 4: DO0; 8. I / O port for controlling the start of air pump #1: AO1; 9. I / O port for controlling the start of 2# air pump: AO2; 10. I / O port for controlling the sound alarm 10: DO5; (2) Definition of intermediate quantity: 11. Time value: t0 12. The time value of the electric preset valve 4 opening: t0.0 13. The time value of opening of 1# electric channel valve 5: t1; 14. The time value of opening of 2# electric channel valve 5: t2; 15. The time value of opening of 3# electric channel valve 5: t3; 16. The time value of opening of 4# electric channel valve 5: t4; 17. 1# air pump flow rate setting value v1; 18. 2# air pump flow rate setting value v2; 19. Flow rate into ammonia detector 1: Qset=500ml / min=500000mm³ / min; (3) Control process logic design: When the system is turned on, t0=1s; t0=t0+1; If t0=40s, DO0=1; / / DO0 actuates, valve opens; (40s preheating) DO1=0; / / DO1 reset, close the valve; DO2=0; / / DO2 reset, close the valve; DO3=0; / / DO3 reset, close the valve; DO4=0; / / DO4 reset, close the valve; The length values ​​of each detection area L1, L2, L3, and L4 are preset to be L1, L2, L3, and L4, and the unit is meter, which is calculated to be 1000mm; then the volume V1 of the sampled gas in the stainless steel tube of detection area 1 is V1=L1*π r², where r=8mm; then V1=200.96*L1 (mm³); similarly, the volume V2 of the sampled gas in the stainless steel tube of detection area 2 is V2=200.96*L2 (mm³); the volume V3 of the sampled gas in the stainless steel tube of detection area 3 is V3=200.96*L3 (mm³); the volume V4 of the sampled gas in the stainless steel tube of detection area 4 is V4=200.96*L4 (mm³); that is: V1=200.96*L1 (mm³) V2=200.96*L2 (mm³) V3=200.96*L3 (mm³) V4=200.96*L4 (mm³) The volume of the stainless steel closed gas chamber 7 is V5 = 100*250*50 (mm³) Calculate the valve opening holding time value: Then: 1# Electric channel valve 5 opening time value t1: t1=V1 / Qset=200.96*L1 / 500000(min) After calculation, we can get: The time value of opening of 1# electric channel valve 5 is t1=4.0192*10^(-4)*L1 (min); where L1 is in mm; The time value of opening of 2# electric channel valve 5 is t2=4.0192*10^(-4)*L2 (min); where L2 is in mm; The time value of the 3# electric channel valve 5 opening is t3=4.0192*10^(-4)*L3 (min); where L3 is in mm; The time value of the 4# electric channel valve 5 opening is t4=4.0192*10^(-4)*L4 (min); where L4 is in mm; The following is the logical sequence control of each process: Assuming that the time value of the electric preset valve 44 opening is t0.0: then: ①Process 1: exhaust air chamber 7 to prepare for the inspection of channel 1#: 1# electric channel valve 5, 2# electric channel valve 5, 3# electric channel valve 5, 4# electric channel valve 5: all closed; Turn on 1# air pump 3 / 2# air pump 3, running time t0.0=V5 / (Q1max)(min), ( / / Because the flow rate of 1# air pump 3 Q1max=8000ml / min, before detecting the gas concentration in the detection area of ​​1# channel, exhaust the air chamber 7) ②Process 2: Detect the sampled gas in channel 1#: Detection environment: After t0.0 time is over, channel 1# is opened, and channels 2#~4# and electric preset valve 4 are closed; Turn on 1# air pump 3, and let in air through 1# channel. The air intake time is t1.1=t1+10s, which is used to detect the detection area of ​​1# channel; ( / / 10 seconds is the time required for the ammonia detector to analyze the gas); within t1.1 time, send a stable sampling gas with a flow rate of 500ml / min to the ammonia detector for analysis and sampling.

[0032] ③Process 3: Exhaust air chamber 7 to prepare for the inspection of channel 2#: Testing environment: After t1.1 time is over, close the 1#, 2#, 3#, 4# electric channel valves 5, and open the electric preset valve 4; Turn on the 1# air pump 3, and let in air through the electric preset valve 4 channel, and continue the air suction operation time t0.0 to exhaust the air bin 7 ( / / to exhaust the gas in the original 1# channel in the air bin 7); ④Process 4. Detection of channel 2#: Detection environment: After t0.0 time is over, channel 2# is opened, and channels 1#, 3#, 4# and electric preset valve 4 are closed; Turn on 1# air pump 3, and let air in through 2# channel. The air intake time is t1.2=t2+10s, which is used to detect the detection area of ​​2# channel. ⑤ Process 5: exhaust air chamber 7 to prepare for the detection of channel 3#. The control logic is consistent with process 3; ⑥Process 6. Test channel 3#: Detection environment: After t0.0 time is over, channel 3# is opened, and channels 1#, 2#, 4# and electric preset valve 4 are closed; Turn on 1# air pump 3, and let air in through 3# channel. The air intake time is t1.3=t3+10s, which is used to detect the detection area of ​​3# channel. ⑦ Process 7: exhaust air chamber 7 to prepare for the detection of channel 4#. The control logic is consistent with process 3; ⑧Process 8. Check channel 4#: Detection environment: After t0.0 time is over, 4# channel is opened, 1#, 2#, 3# channels and electric preset valve 4 are closed; Turn on 1# air pump 3, and let air in through 4# channel. The air intake time is t1.4=t4+10s, which is used to detect the detection area of ​​4# channel. ⑨Process 9: exhaust air chamber 7 to prepare for the detection of channel 1#. The control logic is consistent with process 3; ⑩Process 10. Test channel 1#: Detection environment: After t0.0 time is over, channel 1# is opened, and channels 1#, 2#, 3# and electric preset valve 4 are closed; Turn on 1# air pump 3 to let air in through 1# channel for a continuous air intake time of t1.1=t3+10s, which is used to detect the detection area of ​​1# channel.

[0033] This cycle is repeated to sample and analyze the gas in the relevant channels. The touch screen integrated machine is used to display and compare the real-time data. If the concentration of ammonia exceeds the set value, an alarm signal is output, recorded and saved, and transmitted to the relevant linkage equipment.

[0034] In the description of the present invention, it is necessary to understand that the terms "middle", "length", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, the first feature "on" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The above is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention without creative work should be included in the protection scope of the present invention.

Claims

1. A monitoring system for an ammonia kiln, characterized in that: include: An ammonia detector (1), a controller (2), an air pump (3), an electric preset valve (4), an electric channel valve (5), a gas collecting disk (6) and a gas bin (7), wherein the gas bin (7) is a closed cavity structure, the gas bin (7) is connected to a plurality of gas collecting disks (6) through pipelines, the gas collecting disks (6) are located at different positions of the ammonia kiln, the electric channel valve (5) is arranged at one end of the corresponding pipeline of each gas collecting disk (6) close to the gas bin (7), the gas bin (7) is connected to one end of the ammonia detector (1) through a pipeline, the other end of the ammonia detector (1) is connected to an exhaust port through a pipeline, the air pump (3) is arranged on the pipeline between the gas bin (7) and the ammonia detector (1), the gas bin (7) is connected to one end of the electric preset valve (4) through a pipeline, the other end of the electric preset valve (4) is connected to a medium gas inlet, and the controller (2) is electrically connected to the ammonia detector (1), the air pump (3), the electric preset valve (4) and the electric channel valve (5), respectively.

2. The monitoring system for an ammonia kiln according to claim 1, characterized in that: The pipeline between the ammonia detector (1) and the air pump (3) is provided with a throttle valve (8).

3. The monitoring system for an ammonia kiln according to claim 1, characterized in that: The pipeline between the ammonia detector (1) and the exhaust port is provided with a flow meter (9), and the flow meter (9) is electrically connected to the controller (2).

4. The monitoring system for an ammonia kiln according to claim 1, characterized in that: There are two air pumps (3), and the two air pumps (3) are connected in parallel between the air chamber (7) and the ammonia detector (1) through a pipeline.

5. The monitoring system for an ammonia kiln according to claim 1, characterized in that: It comprises an alarm (10), wherein the alarm (10) is electrically connected to the controller (2).

6. The monitoring system for an ammonia kiln according to claim 1, characterized in that: The gas collecting plate (6) is an inverted truncated cone-shaped structure, a connecting port (601) for connecting a pipeline is provided above the gas collecting plate (6), a plurality of air suction ports (602) are respectively provided at the bottom and side wall of the gas collecting plate (6), and the air suction ports (602) are connected to the connecting port (601).

7. The monitoring system for an ammonia kiln according to claim 6, characterized in that: The connection port (601) and the air intake port (602) are respectively provided with filter screens, and the air collecting disk (6) is filled with dust-proof filter cotton.

8. A monitoring method applied to the monitoring system for an ammonia kiln according to any one of claims 1 to 7, characterized in that: The following steps are involved: Activate the ammonia detector (1); The electric channel valves (5) corresponding to all the gas collecting disks (6) are closed, and the electric preset valve (4) and the air pump (3) are started for a period of time to exhaust the impurity gas in the air bin (7) through the medium gas; The electric channel valve (5) corresponding to the first gas collecting disk (6) is opened, the electric channel valves (5) corresponding to the other gas collecting disks (6) are closed, the air pump (3) is started for a period of time, the gas at the first gas collecting disk (6) is extracted, and the extracted gas is passed through the dynamic ammonia detector (1) for ammonia detection, thereby completing the environmental monitoring at the first gas collecting disk (6); The electric channel valves (5) corresponding to all the gas collecting disks (6) are closed, and the electric preset valve (4) and the air pump (3) are started for a period of time to exhaust the impurity gas in the air bin (7) through the medium gas; The electric channel valve (5) corresponding to the second gas collecting disk (6) is opened, the electric channel valves (5) corresponding to the other gas collecting disks (6) are closed, the air pump (3) is started for a period of time, the gas at the second gas collecting disk (6) is extracted, and the extracted gas is passed through the dynamic ammonia detector (1) for ammonia detection, thereby completing the environmental monitoring at the second gas collecting disk (6); The process is repeated in sequence until the environmental monitoring of all gas collecting plates (6) is completed, and then the process is repeated again for continuous monitoring.

9. The monitoring method for an ammonia kiln according to claim 8, characterized in that: The start-up time of the gas collecting plate (6) corresponding to the gas pump (3) is determined according to the length of the pipeline connecting the gas collecting plate (6) to the gas bin (7).

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