CN107422763B - Propellant step-by-step neutralization spraying system and control method - Google Patents
Propellant step-by-step neutralization spraying system and control method Download PDFInfo
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- CN107422763B CN107422763B CN201710304958.3A CN201710304958A CN107422763B CN 107422763 B CN107422763 B CN 107422763B CN 201710304958 A CN201710304958 A CN 201710304958A CN 107422763 B CN107422763 B CN 107422763B
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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Abstract
The invention discloses a propellant step-by-step neutralizing spraying system which comprises an absorption liquid storage tank and a liquid sending pipe connected with the absorption liquid storage tank, wherein a first water pump, a spraying pipe and a spraying pipe are respectively connected to the liquid sending pipe along a liquid sending direction, a pressure valve is arranged on the part, located between the spraying pipe and the spraying pipe, of the liquid sending pipe, a second liquid sending pipe is further connected between the absorption liquid storage tank and the liquid sending pipe, a second water pump is arranged on the second liquid sending pipe, and a one-way valve along the liquid sending direction is arranged on the second liquid sending pipe. The invention also relates to a control method of the propellant step-by-step neutralization spraying system, which carries out different alarming and security actions according to different leakage degrees of the propellant, and integrates the spraying pipe and the spraying pipe, thereby saving the cost of additionally arranging the spraying pipeline liquid delivery pipe, and carrying out step-by-step starting on the two systems only by controlling the starting of the two water pumps, thereby greatly simplifying the control flow.
Description
Technical Field
The invention relates to the field of security protection spraying, in particular to a propellant step-by-step type neutralization spraying system and a control method.
Background
The liquid propellant commonly used in China comprises hydrazine fuel and dinitrogen tetroxide, wherein the hydrazine fuel belongs to inflammable, explosive, toxic and harmful substances, and the dinitrogen tetroxide is a strong oxidant and belongs to high-toxicity articles. The propellant may be accidentally leaked during storage, a large amount of toxic waste gas is generated during propellant filling and transfer, and safety protection devices are usually designed for the two working conditions of propellant storage and propellant use respectively.
The absorption treatment of the leaked propellant in the storage process adopts a mode of adding a spray nozzle to an absorption liquid supply pipeline, the absorption liquid in the storage tank is pumped into the delivery pipeline by an absorption liquid supply device and sprayed out by a high-speed water mist spray nozzle, and the leaked propellant is absorbed by a spraying mode.
The spraying amount of the spraying system is relatively fixed, and if the spraying amount is designed to be small, when a stored propellant storage tank is seriously leaked, the requirement of spraying absorption cannot be met frequently, so that the propellant is leaked into the air, and pollution is caused. If the amount of spraying is designed to be large, when a small amount of leakage occurs, a large amount of waste of the absorbent liquid is caused.
While conventional spray systems have advantages in absorbing small leaks of propellant, especially for propellant that forms a pool at the surface after a leak, the dense flow of water from the spray system can dilute the liquid propellant and reduce the ambient temperature. However, the traditional spraying mode has insufficient absorption capacity when a large amount of propellant leaks due to an accident, and particularly can spray mist absorption liquid to effectively reduce the accident probability under the condition that a large amount of propellant gas is generated at high temperature or local combustion occurs. The spraying is characterized in that: (1) the spray belongs to a semi-gas phase substance, the mist and the steam of the propellant are easier to mix and compatible and easy to mutually diffuse, and the spray is quicker, more effective and more comprehensive when used for neutralizing the gas phase propellant steam than large liquid drops of a spraying system. (2) The spray area is larger, the heat absorption cooling effect is good, because the spray is easy to be changed into steam after being heated, a large amount of gasification heat energy is absorbed in the process, and the cooling effect of the spray is better than that of dense water flow; (3) the spray and the steam converted by the spray repel air, and the suffocation combustion effect is strong; (4) electrical insulation is good because its molecules are not tightly coupled together like a dense stream of water. The spray not only cools the exposed surface during the fire extinguishing action, but also directs the air flow in the direction of the fire, protecting the safety of the non-fired part.
It can be seen that there are advantages to each of the spray and mist systems, which can be combined with each other with little effort if any complementation.
The invention combines the characteristics of spraying and spraying, designs a security system with more comprehensive functions and more obvious effect, and provides safety protection for storage, filling and transferring of the propellant.
Disclosure of Invention
The idea of the invention for solving the problem of step-by-step starting of spraying and atomizing under the condition of ensuring the cost is as follows: the existing spraying system pipeline is utilized, a section of spraying pipe is additionally arranged at the rear section of the spraying pipeline, and a pressure valve is arranged between the spraying pipe and can be automatically opened when liquid supply is increased in emergency. Meanwhile, a second liquid feeding pipe is connected to the existing liquid feeding pipe in parallel, a second water pump is arranged on the second liquid feeding pipe, the second water pump is started to increase the liquid feeding amount in case of an accident, the pressure of the pipe is increased to enable the pressure valve to be opened, and spraying is started. The security protection spraying pipeline and the spraying pipeline liquid conveying pipeline are arranged on the same pipeline, so that the pipeline arrangement of the system is greatly simplified.
The specific scheme is as follows:
the step-by-step neutralization spraying system comprises an absorption liquid storage box and a liquid feeding pipe connected with the absorption liquid storage box, wherein a first water pump, a spraying pipe and a suction spraying pipe are respectively connected to the liquid feeding pipe along the liquid feeding direction.
And a valve is arranged on the part of the liquid sending pipe between the first water pump and the spray pipe.
The valve is an integrated manual-automatic electric valve, and further comprises a concentration sensor arranged near the ground below the spray pipe, and a control system electrically connected with the integrated manual-automatic electric valve, the concentration sensor, the first water pump and the second water pump.
And a temperature sensor, a humidity sensor and an alarm which are electrically connected with the control system are also arranged near the concentration sensor.
Still including setting up the exhaust fan near the shower and setting up the camera in the shower top, exhaust fan and camera are connected with control system electricity.
The control system comprises a remote monitoring computer and a controller connected with the remote monitoring computer through a network, wherein control software is installed on the remote monitoring computer, and a control program is installed on the controller.
The concentration sensors are arranged in a plurality of regions and are uniformly distributed in the regions below the spray pipes.
A method of controlling a step-wise neutralizing spray system, comprising:
s1 detection concentration: obtaining concentration signals from a plurality of concentration sensors;
s2 threshold comparison: comparing the concentration signals of the plurality of concentration sensors with concentration threshold values respectively;
s3 alarm spray: comparing the concentration signals of any two concentration sensors with a concentration threshold value, and then informing a user or directly alarming, spraying or atomizing;
s4 ventilation and dehumidification: and when the temperature sensor is greater than the temperature threshold value or the humidity sensor is greater than the humidity threshold value, starting the air-conditioning dehumidification system.
The S3 compares the concentration signals of any two concentration sensors with a concentration threshold value for comparison; the method comprises the following steps:
(1) first-level alarming: when the concentration signals of any two concentration sensors are greater than a first concentration threshold value, displaying an alarm signal on control software of a remote control computer;
(2) secondary alarming: when the concentration signals of any two concentration sensors are greater than a second concentration threshold value, displaying an alarm signal on control software of a remote control computer, starting an alarm, starting a manual-automatic integrated electric valve, starting a first water pump and spraying;
(3) and (3) three-level alarming: when the concentration signals of any two concentration sensors are greater than a third concentration threshold value, an alarm signal is displayed on control software of a remote control computer, an alarm is started, an electric manual-automatic valve is started, and a first water pump and a second water pump are started to spray and spray.
The first concentration threshold is 10ppm, the second concentration threshold is 20ppm, the third concentration threshold is 50ppm, the temperature threshold is 36 ℃, and the humidity threshold is 70%.
By adopting the technical scheme, the safe spraying and atomizing protection system is systematically integrated and designed by combining different leakage conditions of the propellant. The spraying and atomizing step-by-step starting is realized by utilizing the water pump and the pressure valve which are connected in parallel. Only a small amount of transformation is carried out on the basis of not changing the existing liquid conveying pipeline. The integrated system occupies smaller space, improves the utilization rate of the equipment and reduces the use cost of the equipment. In order to achieve the design purpose, the integrated system completely meets the safety protection requirement through experimental verification.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a propellant step-wise neutralizing spray system of the present invention
FIG. 2 is a schematic diagram of a control system of the present invention
The device comprises a spray pipe 1, a spray pipe 2, an absorption liquid storage tank 3, a liquid feeding pipe 4, a first water pump 5, a second liquid feeding pipe 6, a second water pump 7, a one-way valve 8, a pressure valve 9, a valve 10, a control system 11, a concentration sensor 12, a temperature sensor 13, a humidity sensor 14, an exhaust fan 15 and a camera 16.
Detailed Description
As shown in fig. 1, the propellant step-by-step type neutralization spray system of the present invention comprises an absorption liquid storage tank 3 and a liquid delivery pipe 4 connected to the absorption liquid storage tank 3, wherein a first water pump 5, a spray pipe 1 and a suction spray pipe 2 are connected to the liquid delivery pipe 4 along a liquid delivery direction, respectively, and is characterized in that a pressure valve 9 is provided at a portion of the liquid delivery pipe 4 located between the spray pipe and the spray pipe 2, a second liquid delivery pipe 6 is further connected between the absorption liquid storage tank 3 and the liquid delivery pipe 4, a second water pump 7 is provided on the second liquid delivery pipe 6, and the pressure valve 9 is provided at the second liquid delivery pipe 6 along the liquid delivery direction.
This kind of scheme utilizes current spraying system's the liquid pipeline that send, has saved the cost that additionally sets up spraying pipe 2 and send the liquid pipeline to with the setting on a pipeline of security protection spraying pipeline and spraying pipe 2 way, simplify the system greatly, only need control opening of two water pumps can carry out the substep to start to two systems, simplified control flow greatly.
The security spray pipeline and the liquid delivery pipe 4 of the spray pipe 2 are arranged on the same pipeline, so that the spray pipe and the spray pipe 2 are used in the same purpose, and both the spray pipe and the spray pipe absorb the same propellant, so that the used absorption liquid is the same. Based on these two points, it is considered that the spray pipe 1 and the spray pipe 2 can be integrally arranged, one liquid feeding pipe 4 is shared, and only one absorption liquid storage tank 3 is arranged, so that the cost for respectively arranging liquid feeding systems is saved. The one-way valve 8 is arranged on the spray pipe 1, so that the two systems can be started step by step only by controlling the opening of the two water pumps, and the control flow is greatly simplified. In use, the shower 1 is put into operation when the first water pump 5 is switched on. However, the pressure in the liquid feed pipe 4 is not sufficient to open the pressure valve 9, and therefore, spraying is not performed. When the second water pump 7 is turned on, the water pressure in the liquid feeding pipe 4 increases, the liquid feeding amount increases, the pressure valve 9 is pushed open, and the spray pipe 2 starts to operate. The purpose of arranging the check valve 8 on the second liquid sending pipe 6 is to prevent the absorption liquid from flowing back from the second liquid sending pipe 6 when the first water pump 5 is started independently, reduce the pressure of the liquid sending pipe and influence the normal spraying.
Further, a valve 10 is arranged on the part of the liquid sending pipe 4 between the first water pump 5 and the spraying pipe 1.
The part of the liquid sending pipe 4 between the first water pump 5 and the spray pipe 1 is also provided with a valve 10, so that the spraying caused by the accidental starting of the water pump is prevented, particularly, when a worker works in the propellant warehouse, the normal work of the worker can be influenced by the accidental spraying, and the scheme that the part of the liquid sending pipe 4 between the first water pump 5 and the spray pipe 1 is also provided with the valve 10 is adopted.
Further, the valve 10 is an automated manual valve, and further comprises a concentration sensor 12 arranged below the shower pipe 1 and near the ground, and a control system 11 electrically connected with the automated manual valve, the concentration sensor 12, the first water pump 5 and the second water pump 7. The arrangement is that the spraying system is started at the first time when leakage occurs, so a monitoring system, specifically a concentration sensor 12 is needed to be arranged for monitoring the concentration, and the propellant gas belongs to heavy gas, so that the propellant gas is heavy and sinks to the position close to the ground, and the concentration sensor 12 is arranged at the position close to the ground. Therefore, the monitoring effect is better, in addition, a control system 11 is needed to react to the signal of the concentration sensor 12, specifically, the control system 11 is electrically connected with the concentration sensor 12, when the concentration signal received by the control system 11 is greater than a certain rated threshold value, the spraying action is started, the control system 11 controls the first water pump 5 to start, and the valve 10 is opened. The valve 10 needs to be an electric valve to control the opening of the valve 10, and a manual-automatic electric valve is used as the valve 10 to ensure that the manual function is kept. When the concentration signal of the leakage concentration sensor 12 further rises, the spray pipe 2 needs to be started, the control system 11 starts the second water pump 7, the pressure in the liquid delivery pipe 4 increases, the pressure valve 9 is pushed open, and the spray pipe 2 starts to work. Since the first water pump 5 and the second water pump 7 are also controlled to be started, the control system 11 is also electrically connected with the first water pump 5 and the second water pump 7. Therefore, the valve 10 is an integrated manual-automatic electric valve, and the technical scheme is that the valve further comprises a concentration sensor 12 arranged below the spray pipe 1 and near the ground, and a control system 11 electrically connected with the integrated manual-automatic electric valve, the concentration sensor 12, the first water pump 5 and the second water pump 7.
Further, a temperature sensor 13 and a humidity sensor 14 electrically connected with the control system 11 are also arranged near the concentration sensor 12. The device also comprises an exhaust fan 15 arranged near the spray pipe 1 and a camera 16 arranged above the spray pipe 1, wherein the exhaust fan 15 and the camera 16 are electrically connected with the control system 11.
The purpose of this arrangement is to take into account that excessive temperatures can cause safety hazards in propellant storage, and therefore the increase in temperature is taken as a safety indicator. Meanwhile, when the concentration sensor 12 fails, the temperature rise can also play a certain early warning role. Too high a humidity also has a negative effect on the propellant storage tanks, for example, increasing the rusting and corrosion of the equipment. The exhaust fan 15 is required to cool and dehumidify. A temperature sensor 13 and a humidity sensor 14 are arranged, and when a temperature signal or a humidity signal obtained by the control system 11 exceeds a certain threshold value, a set exhaust fan 15 is started to play a role in cooling and dehumidifying. A camera 16 is also provided to allow remote monitoring of the safety of the site. Therefore, the invention adopts the structure that the temperature sensor 13 and the humidity sensor 14 which are electrically connected with the control system 11 are also arranged near the concentration sensor 12. The device also comprises an exhaust fan 15 arranged near the spray pipe 1 and a camera 16 arranged above the spray pipe 1, wherein the exhaust fan 15 and the camera 16 are electrically connected with the control system 11.
The control system 11 comprises a remote monitoring computer and a controller connected with the remote monitoring computer through a network, wherein control software is installed on the remote control computer, and a control program is installed on the controller.
Further, as shown in fig. 2, the control system 11 includes a remote monitoring computer and a controller connected to the remote monitoring computer through a network. The remote monitoring must be realized by a computer and a network, the computer is provided with corresponding control software, the controller on site is also provided with corresponding control software, and the remote computer can program the controller on site, set a threshold value and the like, and can also monitor the image obtained by the camera 16. Besides the controller on site can respond when leakage occurs, the computer can be remotely alarmed. In view of the security requirements of industrial production, it is preferable to use an industrial ethernet network for network connection. Therefore, the invention adopts the technical scheme that the control system 11 comprises a remote monitoring computer and a controller connected with the remote monitoring computer through a network, the remote control computer is provided with control software, and the controller is provided with a control program.
Furthermore, a plurality of concentration sensors 12 are arranged and uniformly distributed in the area below the spray pipe 1. This is because, if only one concentration sensor 12 is provided, it is not possible to alarm and start spraying in time when the place where the leakage occurs is far from the sensor. The purpose of arranging a plurality of concentration sensors 12 evenly below the shower pipe 1 is to increase the detection area and to alarm and spray as soon as possible at the first time when a leak occurs.
Further, the control method of the propellant step-by-step neutralization spraying system comprises the following steps:
s1 detection concentration: obtaining concentration signals from a plurality of concentration sensors;
s2 threshold comparison: comparing the concentration signals of the plurality of concentration sensors with concentration threshold values respectively;
s3 alarm spray: comparing the concentration signals of any two concentration sensors with a concentration threshold value, and then informing a user or directly alarming, spraying or atomizing;
s4 ventilation and dehumidification: and when the temperature sensor is greater than the temperature threshold value or the humidity sensor is greater than the humidity threshold value, starting the air conditioner dehumidifier.
The step S3 of comparing the concentration signal of any one concentration sensor with a concentration threshold value; the method comprises the following steps:
(1) first-level alarming: when the concentration signal of any concentration sensor is greater than a first concentration threshold value, displaying an alarm signal on control software of a remote control computer;
(2) secondary alarming: when the concentration signals of any two concentration sensors are greater than a second concentration threshold value, displaying an alarm signal on control software of a remote control computer, starting an alarm, starting a manual-automatic integrated electric valve, starting a first water pump and spraying;
(3) and (3) three-level alarming: when the concentration signals of any two concentration sensors are greater than a third concentration threshold value, an alarm signal is displayed on control software of a remote control computer, an alarm is started, an electric manual-automatic valve is started, and a first water pump and a second water pump are started to spray and spray.
The first concentration threshold is 10ppm, the second concentration threshold is 20ppm, the third concentration threshold is 50ppm, the temperature threshold is 36 ℃, and the humidity threshold is 70%.
The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only used for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention belong to the protection scope of the present invention.
Claims (10)
1. The step-by-step propellant neutralizing spraying system comprises an absorption liquid storage box and a liquid sending pipe connected with the absorption liquid storage box, wherein a first water pump, a spraying pipe and a spraying pipe are respectively connected to the liquid sending pipe along the liquid sending direction.
2. The propellant step-by-step neutralizing spray system of claim 1 wherein said portion of said delivery line between said first pump and said spray line is further provided with a valve.
3. The propellant step-by-step neutralizing spray mist system of claim 2 wherein said valve is an automated manual valve, further comprising a concentration sensor disposed below said spray pipe near the ground, and a control system electrically connected to said automated manual valve, said concentration sensor, said first water pump and said second water pump.
4. The propellant step-by-step neutralizing spray system of claim 3 wherein a temperature sensor, a humidity sensor and an alarm are provided in proximity to said concentration sensor and electrically connected to said control system.
5. The propellant step-by-step neutralizing spray mist system of claim 3 wherein an exhaust fan is disposed adjacent to the spray pipe and a camera is disposed above the spray pipe, said exhaust fan and camera being electrically connected to the control system.
6. The propellant step-by-step neutralizing spray system as claimed in claim 3, wherein said control system comprises a remote monitoring computer and a controller connected to said remote monitoring computer, said remote monitoring computer having control software installed thereon, said controller having a control program installed thereon.
7. The propellant step-by-step neutralizing spray system of claim 3 wherein said concentration sensor is provided in plurality and is distributed evenly in the area below the spray pipe.
8. A method of controlling a propellant step-wise neutralising spray system as claimed in any one of claims 1 to 7, comprising:
s1 detection concentration: obtaining concentration signals from a plurality of concentration sensors;
s2 threshold comparison: comparing the concentration signals of the plurality of concentration sensors with concentration threshold values respectively;
s3 alarm spray: comparing the concentration signals of any two concentration sensors with a concentration threshold value, and then informing a user or directly alarming, spraying or atomizing;
s4 ventilation and dehumidification: and when the temperature sensor is greater than the temperature threshold value or the humidity sensor is greater than the humidity threshold value, starting the air conditioner dehumidifier.
9. The method according to claim 8, wherein the S3 compares the concentration signals of any two concentration sensors with a concentration threshold; the method comprises the following steps:
(1) first-level alarming: when the concentration signals of any two concentration sensors are greater than a first concentration threshold value, displaying an alarm signal on control software of a remote control computer;
(2) secondary alarming: when the concentration signals of any two concentration sensors are greater than a second concentration threshold value, displaying an alarm signal on control software of a remote control computer, starting an alarm, starting a manual-automatic integrated electric valve, starting a first water pump and spraying;
(3) and (3) three-level alarming: when the concentration signals of any two concentration sensors are greater than a third concentration threshold value, an alarm signal is displayed on control software of a remote control computer, an alarm is started, an electric manual-automatic valve is started, and a first water pump and a second water pump are started to spray and spray.
10. The method of claim 9, wherein the first concentration threshold is 10ppm, the second concentration threshold is 20ppm, the third concentration threshold is 50ppm, the temperature threshold is 36 ℃, and the humidity threshold is 70%.
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| CN201710304958.3A CN107422763B (en) | 2017-05-03 | 2017-05-03 | Propellant step-by-step neutralization spraying system and control method |
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| CN201710304958.3A CN107422763B (en) | 2017-05-03 | 2017-05-03 | Propellant step-by-step neutralization spraying system and control method |
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| CN107422763B true CN107422763B (en) | 2020-06-30 |
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| CN112361215B (en) * | 2020-11-13 | 2022-05-27 | 沈阳航天新光集团有限公司 | Device and method for non-toxic treatment of residual propellant after spacecraft recovery landing |
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