CN115634407B - Simulation system for fire extinguishing test of converter valve hall - Google Patents
Simulation system for fire extinguishing test of converter valve hall Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 77
- 238000004088 simulation Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000006260 foam Substances 0.000 claims abstract description 60
- 239000007921 spray Substances 0.000 claims abstract description 33
- 239000003595 mist Substances 0.000 claims abstract description 27
- 238000013461 design Methods 0.000 claims abstract description 18
- 238000012790 confirmation Methods 0.000 claims abstract description 4
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- 238000004458 analytical method Methods 0.000 claims description 3
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
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- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention discloses a simulation system for a fire extinguishing test of a converter valve hall, which comprises a converter valve hall model, a turbofan gun, a water supply unit, a target parameter design unit, a data acquisition unit and a test result confirmation unit, wherein the converter valve hall model is used for scaling the size of the converter valve hall to obtain the model and simulating various fire situations and fire loads of fire objects in the model; the water supply unit is used for uniformly mixing water and foam to form a mixed solution, and conveying the mixed solution to the turbofan cannon; the target parameter design unit determines the initial flow of the turbofan gun, the flow of the water supply unit and the pipe diameter according to the size of the converter valve hall model; the test result confirming unit adjusts the quantity and the flow of the atomizing spray heads according to the test data acquired by the data acquisition unit, so as to determine the optimal flow and the optimal protection radius of the turbofan under different fire sources under the shrinkage ratio. And verifying fires and fire extinguishing conditions of converter valve halls with different sizes and different specifications through a scaled fire entity test, and determining parameters of a turbofan water mist fire extinguishing system corresponding to the different converter valve halls.
Description
Technical Field
The invention belongs to the technical field of fire control of a converter valve hall, and particularly relates to a simulation system for a fire extinguishing test of the converter valve hall.
Background
China is the country with the largest direct current transmission project and the largest direct current transmission capacity in the world. The converter valve is a core device in the direct current converter station and is expensive. The converter valves are usually installed in relatively closed valve halls, the investment of the converter valves and valve halls is almost 1/4 of the investment of the whole station, and the protection of the converter valves is one of the important points of the direct current converter stations. The converter valve assembly has a plurality of elements such as thyristors, capacitors, resistors, trigger plates and the like, and operates in a high-voltage and high-field-intensity environment, and the converter valve has a fire disaster caused by discharge, overheat and the like. In addition, because a plurality of converter transformers are directly communicated with the converter valve hall, when the converter transformers catch fire, fireproof blocking between the converter transformers and the converter valve hall is burnt out, when a large amount of oil smoke and open fire enter the valve hall, the top of the valve hall is burnt and collapses, and after the collapsed steel beam breaks down valve side sleeves of other converter transformers, the fire in the valve hall is spread to other converter transformers through the damaged parts of the sleeves. Therefore, the fire extinguishing of the converter valve hall should be emphasized.
At present, manual fire extinguishing is mainly adopted for a converter valve hall fire disaster, and valve tower fire extinguishing is carried out by using a lifting platform vehicle through patrol corridor injection or entering the valve hall. However, because the area of the converter valve hall is large and the height is high, the manual fire extinguishing can not be effectively performed in the initial stage of a fire disaster, and the fire extinguishing reliability is poor. Aiming at the characteristics of a converter valve hall, namely, not only electric fire disasters but also liquid fire disasters are possible, and the problems of low manual fire extinguishing speed and poor reliability are solved. The turbofan water mist fire extinguishing system can automatically position flame through an image detection technology, so that the problem of response speed is solved; and adopts a mixed solution of water and foam. The mixed liquid has high-efficiency and environment-friendly 3% water film-forming foam liquid, and improves the extinguishing effect on oil fires. Besides, the turbofan water mist fire extinguishing system can spray water mist, and the particle size of mist drops is only Dv0.50 & lt 200 mu m and Dv0.99 & lt 400 mu m, so that the system has good fire extinguishing effect and good electrical insulation on electrical equipment fires. The turbofan water mist fire extinguishing system adopts a turbofan technology, and can realize remote fire extinguishment, thereby solving the problem of large-space fire extinguishment.
However, turbofan water mist fire suppression systems have no regulatory basis in terms of design parameter choices, and therefore require development test studies. The area of the converter valve hall is thousands of square meters, the height of the converter valve hall is tens of meters, the difficulty of developing a series of fire extinguishing tests on the actual project site is great, and in addition, the manufacturing cost of the large-size test site is also high. Therefore, how to develop an entity test of the turbofan water mist fire extinguishing system in the converter valve hall is a great difficulty.
Disclosure of Invention
Based on the above, the invention aims to provide a simulation system for a fire extinguishing test of a converter valve hall, which is used for solving the technical problem that the full-size fire extinguishing test cannot be carried out on the converter valve hall due to the huge scale of an actual scene, and the problem that how to determine fire extinguishing parameters to enable the simulation result to be close to reality.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a simulation system for a fire test in a converter valve hall, comprising:
the converter valve hall model is used for scaling the size of the converter valve hall for investigation to obtain a model, and a plurality of fire conditions and fire loads of fire objects in the combustible object simulation model are arranged in the converter valve hall model;
the turbofan gun is arranged on the converter valve hall model and is used for aiming an injection port of an atomization nozzle of the turbofan gun at a fire object in the converter valve hall model to perform fire extinguishing operation;
the water supply unit comprises a water supply pump set, a foam tank and an area control valve set, wherein the input end of the water supply pump set is used for connecting municipal water supply, the input end of the foam pump set is connected with the foam tank, the output end of the water supply pump set and the foam pump set are connected with the input end of the area control valve set, so that water and foam are uniformly mixed into mixed liquid through the area control valve set and are conveyed to a turbofan gun, and the turbofan gun and the water supply unit form a turbofan fine water mist fire extinguishing system together;
a target parameter design unit for determining the initial flow of the turbofan gun, the flow and the pipe diameter of the water supply unit according to the size of the converter valve hall model, the initial flow of the turbofan is configured to obtain a flow value of each turbofan according to the preset spray intensity multiplied by the area of the converter valve hall model and divided by the number of the turbofan in the place, and the flow of each atomizing nozzle is determined; the flow rates of the water supply pump group and the foam pump group are configured to be determined based on the flow rate value of the turbofan gun and the flow rate ratio of the preset water supply pump and the foam pump, and the input pipe diameter of the regional control valve group is determined through the flow rates of the water supply pump group and the foam pump group;
the data acquisition unit is used for acquiring the position of the preset flame, and the temperature, the CO concentration and the O2 concentration change of the test scene;
and the test result confirmation unit is used for adjusting the quantity and flow of the atomizing spray heads according to the test data acquired by the data acquisition unit, so as to determine the optimal flow and the optimal protection radius of the turbofan gun under different fire sources under the shrinkage ratio, and provide test basis for the design of the turbofan water mist fire extinguishing system of different converter valve halls.
In one embodiment, the turbofan gun is fixed on the side wall of the converter valve hall model, and the turbofan gun comprises an electrical control cabinet, an atomizing nozzle, a pitching movement mechanism, a rotary movement mechanism and a base, wherein the atomizing nozzle is rotatably arranged on the base, the pitching movement mechanism is used for adjusting the pitching movement angle of the atomizing nozzle, the rotary movement mechanism is used for adjusting the horizontal rotation angle of the atomizing nozzle, and the electrical control cabinet is used for controlling the actions of the pitching movement mechanism and the rotary movement mechanism.
In one embodiment, the number of the atomizing spray heads is a plurality, and the plurality of the atomizing spray heads is configured to adjust the number and flow rate of the spray heads according to fire type, position and flame power.
In one embodiment, the water supply pump set and the foam pump set respectively provide a water source and a foam source for the atomizing nozzle, and are all one by one, and the flow ratio of a single water supply pump to the foam pump is 97%:3, determining the scaled flow according to the preset spray intensity; and calculating the on-way resistance loss and static pressure difference according to the preset input pressure of 1.2MPa of the turbofan gun, and determining the design pressure of the water pump and the foam pump.
In one embodiment, the area control valve group comprises a water inlet pipeline, a foam pipeline, a proportion mixer, a mixed liquid water outlet pipeline and a drainage debugging ball valve arranged on the mixed liquid water outlet pipeline, wherein a first input end of the proportion mixer is connected with a water supply pump set through the water inlet pipeline, a second input end of the proportion mixer is connected with the foam pump set through the foam pipeline, an output end of the proportion mixer is connected with the atomizing nozzle through the mixed liquid water outlet pipeline, the area control valve group is used for realizing accurate mixing of water and foam, and realizing water quantity adjustment by opening the drainage ball valve, so that the pressure of the atomizing nozzle is unchanged when the flow of the atomizing nozzle is reduced.
In one embodiment, the data acquisition unit comprises a temperature acquisition system, an infrared thermal imaging acquisition system, a video acquisition system, a gas acquisition system, a pressure and flow acquisition system, wherein,
the temperature acquisition system is used for acquiring temperature changes in the converter valve hall model;
the infrared thermal imaging system is used for positioning the position, the burning degree and the extension condition of the fire center and determining the fire state;
the video acquisition system is used for recording the combustion process and the fire extinguishing process of combustible matters in the converter valve hall;
the gas collection system is used for collecting the concentration of CO and the concentration of O2 in a test scene;
the pressure and flow acquisition system is used for acquiring pressure and flow changes of the water mist atomizing spray head.
In one embodiment, the temperature acquisition system comprises a first temperature measurement module, a second temperature measurement module, a third temperature measurement module and a data acquisition instrument, wherein the first temperature measurement module is arranged along a vertical central axis of flame, the second temperature measurement module is arranged along a horizontal central axis of flame, the third temperature measurement module is arranged along the horizontal central axis of flame and is perpendicular to the second temperature measurement module, the first temperature measurement module, the second temperature measurement module and the third temperature measurement module are respectively in wireless connection with the data acquisition instrument to acquire temperature change data of a test site, and each temperature measurement module is loaded on a carrier by a plurality of thermocouples and arranged in rows at intervals; the spacing between each row of adjacent thermocouples is not less than 1m.
In one embodiment, the infrared thermal imaging acquisition system comprises an infrared thermal imager and a computer operating system, wherein the infrared thermal imager transmits acquired temperature information to the computer operating system to display temperature changes near a fire scene in real time and judge the extinguishing condition of the fire, and/or
The video acquisition system is a camera to record the whole test process and provide supporting data for next step of arrangement and analysis of test data.
In one embodiment, the gas collection system comprises a flue gas analyzer and a flue gas collection probe, wherein the flue gas collection probe is installed in the test platform, and the flue gas analyzer is connected with the flue gas collection probe through a wired hose to detect the changes of the concentration of CO and the concentration of O2 in the test scene in the converter valve hall model.
In one embodiment, the pressure and flow collection system includes a pressure gauge and a pressure and flow sensor, and the pressure gauge, the pressure and flow sensor are installed between the area control valve group and the turbofan gun to monitor pressure and flow changes of water flow in real time.
Compared with the prior art, the invention has the beneficial effects that: the converter valve hall model scaling converter valve hall simulates fire scene, can simulate fire working conditions of various converter valve hall engineering projects, and solves the current situation that the converter valve hall engineering projects are large in volume and difficult to simulate; the invention not only scales the different converter valve halls, but also scales the flow of the pump group and the pipe network system and the flow of the atomizing nozzle in the turbofan gun, so that the simulation effect is the same as that of the actual project, and an accurate basis is provided for determining the design of the turbofan fine water mist fire extinguishing system for the actual project of the converter valve halls. The turbofan gun can study the fire extinguishing effect under the condition of unchanged pressure and flow rate; and a temperature, video, thermal imaging, gas, pressure and flow data acquisition system is arranged, so that detailed data in the test process are acquired, and a basis is provided for determining design parameters of the turbofan water mist fire extinguishing system for actual projects of a converter valve hall.
Drawings
Fig. 1 is a schematic diagram of a simulation system for a fire test in a converter valve hall of the present invention.
FIG. 2 is a schematic diagram of the connection of the turbofan cannon of the present invention to a water supply system.
Fig. 3 is a schematic structural diagram of a simulation system for a fire extinguishing test of a converter valve hall according to the present invention.
Reference numerals illustrate:
the system comprises a 1-data acquisition unit, a 2-foam tank, a 3-water supply pump set, a 4-foam pump set, a 5-area control valve set, a 6-turbofan gun, a 7-converter valve hall model, an 8-temperature acquisition system, a 9-infrared thermal imaging acquisition system, a 91-infrared thermal imager, a 10-video acquisition system, an 11-gas acquisition system, a 111-smoke acquisition probe, a 112-smoke analyzer, a 12-pressure and flow acquisition system, a 121-pressure meter and 122-pressure and flow sensors.
Detailed Description
The two components of the embodiment, namely, the turbofan water mist fire extinguishing system diagram and the converter valve hall model diagram, will be described in detail below with reference to the drawings in the embodiment of the invention.
In the prior art, the current domestic fire test sites cannot meet the fire test requirements of the same size due to oversized converter valve halls. Therefore, the invention provides a simulation system for a fire extinguishing test of a converter valve hall, which is used for acquiring detailed data in the test process through a data acquisition system and providing a basis for determining parameters of a turbofan water mist fire extinguishing system for actual projects of the converter valve hall.
Referring to fig. 1-3, for example, a simulation system for a hall fire test of a converter valve, comprising: the system comprises a converter valve hall model, a turbofan gun, a water supply unit, a target parameter design unit, a data acquisition unit and a test result confirmation unit. The converter valve hall model is used for scaling the size of the converter valve hall to obtain a model, and a plurality of fire conditions and fire loads of fire objects in the scaling model are simulated through combustible objects arranged in the scaling model; the turbofan gun is arranged on the converter valve hall model and is used for aiming an injection port of an atomization nozzle of the turbofan gun at a fire object in the converter valve hall model to perform fire extinguishing operation; the water supply unit comprises a water supply pump set, a foam tank and a regional control valve group, wherein the input end of the water supply pump set is used for connecting municipal water supply, the input end of the foam pump set is connected with the foam tank, the output end of the water supply pump set and the foam pump set are connected with the input end of the regional control valve group, so that water and foam are uniformly mixed into mixed liquid through the regional control valve group and are conveyed to a turbofan gun, and the turbofan gun and the water supply unit form a turbofan fine water mist fire extinguishing system together;
the target parameter design unit is used for determining the initial flow of the turbofan gun and the flow and pipe diameter of the water supply unit according to the size of the converter valve hall model, wherein the initial flow of the turbofan gun is configured to be divided by the number of the turbofan guns at the place according to the preset spray intensity multiplied by the area of the converter valve hall model to obtain the flow value of each turbofan gun and determine the flow of each atomizing nozzle; the preset spray strength is the spray strength of the water spray fire extinguishing system in the actual project, and is larger than that of the foam fire extinguishing system and the water mist fire extinguishing system, namely, the maximum value of the turbofan gun can be calculated according to the spray strength of the water spray fire extinguishing system, and then the flow of the turbofan gun is reduced according to the fire extinguishing condition. The flow rates of the water supply pump group and the foam pump group are configured to be determined based on the flow rate value of the turbofan gun and the flow rate ratio of the preset water supply pump and the foam pump, and the input pipe diameter of the regional control valve group is determined through the flow rates of the water supply pump group and the foam pump group; the pipe network of the water supply pump group is selected to calculate the pipe diameter according to the flow velocity of the pipeline in the specification; the pipe diameter of the foam pump group is calculated according to the flow rate of the pipeline in the specification, the pipe diameters of the water inlet pipeline and the foam pipeline of the regional control valve group are corresponding to the water supply pump group and the foam pump group, and the water outlet pipe diameter of the mixed liquid is corresponding to the flow rate of the turbofan gun. The data acquisition unit is used for acquiring the position of the preset flame, and the temperature, the CO concentration and the O2 concentration change of the test scene; the test result confirming unit is used for adjusting the quantity and flow of the atomizing spray heads according to the test data acquired by the data acquisition unit, so that the optimal flow and the optimal protection radius of the turbofan gun under different fire sources under the shrinkage proportion are determined, and test basis is provided for the design of the turbofan water mist fire extinguishing system of different converter valve halls. .
The simulation system for the fire extinguishing test of the converter valve hall not only scales the size of the converter valve hall, but also scales the flow of the pump group, the pipe network system and the atomizing nozzle, so that the simulation effect is the same as that of an actual project, the temperature and the gas concentration after scaling in the test result are the same as those of the actual project, and an accurate basis is provided for determining the design parameters of the turbofan water mist fire extinguishing system for the actual project of the converter valve hall. By confirming the disappearance of the open flame, the fire extinguishing effect can be quantitatively checked with the change of the temperature and the gas concentration.
In the present embodiment, first, the scaling data is obtained from the size of the converter valve hall and the size (model) of the test site. The flow of the atomizing nozzle is scaled according to the preset spray intensity, and the related flow of the water supply pump and the foam pump, the pipe diameter of the pipe network and the specification of the regional control valve group are obtained according to the flow. The turbofan gun firstly determines larger flow, and then determines more reasonable flow parameters according to the reduction of the flow according to the fire test result. In this process, the net volume of the foam tank is determined based on 3% of the atomizer flow and taking into account the time of spraying, which may be 22 minutes, etc. The converter valve hall model is fixed in size, and the flow of the atomizing spray heads can be adjusted according to different fire source powers, fire source types and fire source positions, including changing the number of the atomizing spray heads and the flow of the spray heads; in order to ensure that the pressure of the tail end of the system, namely the atomizing nozzle, is unchanged, the water quantity is adjusted by adjusting the water discharge ball valve of the regional control valve group, so that the pressure requirement required by the system is met. And finally, determining the flow of the atomizing nozzle under the condition of different fire sources of the scaling model through a physical test result, and calculating through a dimensionless formula to obtain the design flow of the atomizing nozzle system in the actual engineering project. When the project is changed, the scaling data and the scaling model size can be changed, so that the aim of simulating different converter valve hall projects is fulfilled. In order to record and analyze the test process and result in detail, the test is also provided with a temperature acquisition system, an infrared thermal imaging acquisition system, a video acquisition system, a gas acquisition system and a pressure and flow acquisition system, so that test data support is provided for determining the turbofan water mist fire extinguishing system. On the basis of scaling the size of the converter valve hall, the pump group, the pipe network system and the turbofan flow are scaled, so that the matching performance is achieved.
For example, a single valve hall plane was studied to have dimensions of 50m×24m (length×width), with an overall height of about 21m. Each valve hall is provided with 6 valve towers, each valve tower is provided with a turbofan gun, the plane size of each valve tower is about 9.8m multiplied by 6.2m (length multiplied by width), and the height of each valve tower is about 13.2m. The converter valve hall can be scaled by 0.5 scale, the converter valve hall model is 25m long and 12m wide and 10.5m high, wherein if a valve tower is involved in the converter valve hall model, the scale can be scaled by 0.5 scale, so that the height ratio of the turbofan gun in the converter valve hall model and the actual project is kept consistent. Secondly, flow data of the turbofan gun are determined, the pump set selection type is calculated, and after the pump set selection is finished, adjustment can not be carried out. Since the flow is a large value. Then, when testing the comparative test of different turbofan parameters, only the flow is reduced. For turbofan cannons, the method for reducing the flow comprises the following steps: firstly, the number of nozzles (atomizing nozzles) is reduced, and the nozzles can be plugged by plugs; secondly, the nozzle flow is reduced. Because the spray intensity of the water spray fire extinguishing system is larger than that of the foam fire extinguishing system and the water mist fire extinguishing system, the spray intensity (20L/min square meter, 14.14L/min square meter after the reduction) of the water spray fire extinguishing system is multiplied by the area of a converter valve hall model, the flow value of each turbofan gun is obtained by dividing the number of the turbofan guns 6 of the place, the flow of each spray head is determined according to the number of the spray heads of the turbofan guns, and the pipe diameter and the pump set are determined according to the flow in the place. If the area of the current conversion valve hall model is 300 square meters after the scale is reduced, the flow of each turbofan gun is 11.79L/s, and the area control valve group realizes that water and foam are mixed according to 97%: mixing 3% and considering 2 turbofan guns at most in fire, wherein the flow of the foam pump is 0.7L/s and the flow of the water pump is 22.87L/s; the area control valve bank flow is 11.79L/s (consider a valve bank for a turbofan gun).
As shown in fig. 3, the converter valve hall model comprises geometric space construction, and is mainly composed of color steel plates and reinforced concrete walls, wherein the reinforced concrete walls are only adopted on one side wall provided with the atomizing nozzle, and the color steel plates are movable. A door and a transparent observation window are arranged on the geometric space, and a thermal imaging observation port is arranged for arranging a thermal imaging machine; the observation window is provided with a camera for recording the test process. The converter valve hall model also comprises a fire source model, wherein the fire source model can change the fire source type such as liquid fire or electric fire, the fire source power and the fire source position through various fire conditions and fire load of fire objects in the combustible material simulation model so as to achieve the aim of truly simulating the fire disaster of an actual engineering project; and determining the design flow of the atomizing nozzle according to the type of the fire source and the power of the fire source, and determining the protection radius of the atomizing nozzle according to the position of the fire source. It should be understood that the combustible material simulated fire source is a fire source type and a position thereof which are easy to occur in a converter valve hall are determined through actual investigation. When simulating converter valve halls with other sizes, the color steel plate can be moved, so that the test conditions under different converter valve halls can be simulated. When the simulated 3-seat valve tower converter valve hall is 25m×24mx21m (length×width x height), the scaling can be performed according to the scaling ratio of 0.5, and the scaled converter valve hall model is 12.5m×12mx10.5m (length×width x height), and the method is realized by moving the color steel plate.
In the water supply system, the input end of the water supply pump set is connected with a municipal water supply network, and the output end of the water supply pump set is connected with the input end of the regional control valve set; the input end of the foam pump group is connected with the foam tank, and the output end of the foam pump group is connected with the input end of the regional control valve group; the area control valve group realizes that foam and water are according to 3%:97% of the water is mixed, and the flow of the pipe network can be regulated through a drain ball valve. The output end of the area control valve group is connected with the input end of the turbofan gun, and the jet orifice of the turbofan gun is aligned with the flame of the test platform to perform fire extinguishing operation.
The pressure and flow acquisition system 12 is used for acquiring pressure and flow changes of the water mist spray head. The pressure and flow collection system 12 includes a pressure gauge 121 mounted at the input end of the turbofan gun, and a pressure and flow sensor 122 mounted between the pressure gauge and the zone control valve group. Through the signal feedback, the pressure and flow change of the water flow can be monitored in real time in the test process. The foam pump set and the water supply pump set are all one. The foam pump set comprises a gate valve, a Y-shaped filter, a rubber soft joint, an eccentric big-small head, a concentric big-small head, a pressure gauge and a check valve. The water supply pump set comprises a gate valve, a Y-shaped filter, a rubber soft joint, an eccentric big and small head, a concentric big and small head, a pressure gauge, a check valve and a drain valve.
In one embodiment, the data acquisition system comprises a temperature acquisition system, an infrared thermal imaging acquisition system, a video acquisition system, a gas acquisition system, and a pressure and flow acquisition system, wherein the temperature acquisition system is used for acquiring temperature changes in a converter valve hall model; the infrared thermal imaging system is used for positioning the position, the burning degree and the extension condition of the fire center and determining the fire state; the video acquisition system is used for recording the combustion process and the fire extinguishing process of combustible matters in the converter valve hall; the gas collection system is used for collecting the concentration of CO and the concentration of O2 in a test scene; the pressure and flow acquisition system is used for acquiring pressure and flow changes of the water mist atomizing spray head.
Specifically, the temperature acquisition system 8 includes a first temperature measurement module, a second temperature measurement module, a third temperature measurement module, and a data acquisition instrument. The first temperature measurement module sets up along the vertical axis of flame, and the second temperature measurement module sets up along the horizontal axis of flame, and the third temperature measurement module sets up along the horizontal axis of flame and perpendicular to second temperature measurement module, and first temperature measurement module, second temperature measurement module, third temperature measurement module pass through wireless connection with the data acquisition instrument respectively in order to gather the temperature variation data of experimental scene. The thermocouple number in the temperature measuring module is determined according to the shrinkage ratio value and the acquisition accuracy, and the thermocouple distance in the corresponding actual project is not smaller than 1m.
The gas collection system 11 comprises a smoke analyzer and a smoke collection probe, wherein the smoke collection probe is arranged in the converter valve hall model and is determined according to the position of a fire source; the flue gas analyzer is arranged outside the converter valve hall model, and the flue gas sensor is connected with the flue gas analyzer through a wire.
The infrared thermal imaging acquisition system comprises an infrared thermal imager and a computer operating system, wherein the infrared thermal imager transmits acquired temperature information to the computer operating system so as to display temperature changes near a fire scene in real time and judge the extinguishing condition of the fire. The video acquisition system is a camera to record the whole test process and provide supporting data for next step of arrangement and analysis of test data.
The turbofan gun is fixed at the middle position of the top of the concrete wall of the converter valve hall model by adopting a fixing device. The fixing device comprises a mounting bracket which is fixed at the top of the reinforced concrete wall, and then the atomizing nozzle is connected and fixed with the mounting bracket by bolts. The angle can be automatically controlled through an electrical control cabinet, the pitching action angle of the atomizing nozzle is adjusted through a pitching moving unit in the atomizing nozzle, and the horizontal rotation angle is adjusted through a turning moving unit. It should be understood that the pitching moving unit and the swiveling moving unit are both the prior art, and only the mechanical structure for realizing the functions of pitching motion angle and horizontal rotation angle of the atomizer in the prior art is needed.
Therefore, the simulation system for the fire extinguishing test of the converter valve hall is arranged, a scaled model is adopted to simulate the fire of the converter valve hall, and the scaled turbofan fine water mist fire extinguishing system is used for the fire extinguishing test to determine design parameters of the atomizing spray heads under the fire of different converter valve halls, including flow, protection radius and the like, so that data support is provided for the fire protection of the converter valve hall in actual projects. The converter valve hall model, the parameters of the atomizing nozzle and the actual project are scaled according to the equal proportion after the test verification, so that the aim of guiding the actual project is achieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A simulation system for a fire test in a converter valve hall, comprising:
the converter valve hall model is used for scaling the size of the converter valve hall for investigation to obtain a model, and a plurality of fire conditions and fire loads of fire objects in the combustible object simulation model are arranged in the converter valve hall model;
the turbofan gun is arranged on the converter valve hall model and is used for aiming an injection port of an atomization nozzle of the turbofan gun at a fire object in the converter valve hall model to perform fire extinguishing operation;
the water supply unit comprises a water supply pump set, a foam tank and an area control valve set, wherein the input end of the water supply pump set is used for connecting municipal water supply, the input end of the foam pump set is connected with the foam tank, the output end of the water supply pump set and the foam pump set are connected with the input end of the area control valve set, so that water and foam are uniformly mixed into mixed liquid through the area control valve set and are conveyed to a turbofan gun, and the turbofan gun and the water supply unit form a turbofan fine water mist fire extinguishing system together;
the target parameter design unit is used for determining the initial flow of the turbofan gun and the flow and pipe diameter of the water supply unit according to the size of the converter valve hall model, wherein the initial flow of the turbofan gun is configured to be divided by the number of the configured turbofan guns according to the preset spray intensity multiplied by the area of the converter valve hall model to obtain the flow value of each turbofan gun, and the flow of each atomizing nozzle of the turbofan gun is determined; the flow rates of the water supply pump group and the foam pump group are configured to be determined based on the flow rate value of the turbofan gun and the flow rate ratio of the preset water supply pump and the foam pump, and the input pipe diameter of the regional control valve group is determined through the flow rates of the water supply pump group and the foam pump group;
the data acquisition unit is used for acquiring the position of the preset flame and the temperature, CO concentration and O2 concentration changes of the test scene;
and the test result confirmation unit is used for adjusting the quantity and flow of the atomizing spray heads according to the test data acquired by the data acquisition unit, so as to determine the optimal flow and the optimal protection radius of the turbofan gun under different fire sources under the shrinkage ratio, and provide test basis for the design of the turbofan water mist fire extinguishing system of different converter valve halls.
2. The simulation system of a fire extinguishing test in a converter valve hall according to claim 1, wherein the turbofan gun is fixed on a side wall of a converter valve hall model, the turbofan gun comprises an electrical control cabinet, an atomizer, a pitching movement mechanism, a slewing movement mechanism and a base, the atomizer is rotatable and arranged on the base, the pitching movement mechanism is used for adjusting a pitching movement angle of the atomizer, the slewing movement mechanism is used for adjusting a horizontal rotation angle of the atomizer, and the electrical control cabinet is used for controlling actions of the pitching movement mechanism and the slewing movement mechanism.
3. The simulation system of a fire test in a converter valve hall of claim 2, wherein the number of atomizer heads is a plurality, and the plurality of atomizer heads is configured to adjust the number of heads and the flow rate according to the type of fire, the location and the flame power.
4. The simulation system of the fire extinguishing test of the converter valve hall according to claim 1, wherein the water supply pump set and the foam pump set respectively provide a water source and a foam source for the atomizing nozzle, and are all one-to-one, and the flow ratio of a single water supply pump to the foam pump is 97%:3, determining the scaled flow according to the preset spray intensity; and calculating the on-way resistance loss and the static pressure difference according to the preset input pressure of the turbofan cannon, and then determining the design pressure of the water pump and the foam pump.
5. The simulation system of a fire extinguishing test in a converter valve hall according to claim 1, wherein the area control valve group comprises a water inlet pipeline, a foam pipeline, a proportional mixer, a mixed liquid water outlet pipeline and a drainage debugging ball valve arranged on the mixed liquid water outlet pipeline, a first input end of the proportional mixer is connected with a water supply pump set through the water inlet pipeline, a second input end of the proportional mixer is connected with the foam pump set through the foam pipeline, an output end of the proportional mixer is connected with an atomizing nozzle of the turbofan gun through the mixed liquid water outlet pipeline, the area control valve group is used for realizing accurate mixing of water and foam, and water quantity adjustment is realized by opening the drainage ball valve, so that the pressure of the atomizing nozzle is unchanged when the flow rate of the atomizing nozzle is reduced.
6. The simulation system of a fire extinguishing test in a converter valve hall according to claim 1, wherein the data acquisition unit comprises a temperature acquisition system, an infrared thermal imaging acquisition system, a video acquisition system, a gas acquisition system, and a pressure and flow acquisition system; wherein,,
the temperature acquisition system is used for acquiring temperature changes in the converter valve hall model;
the infrared thermal imaging acquisition system is used for positioning the azimuth, the combustion degree and the extension condition of the fire center and determining the fire state;
the video acquisition system is used for recording the combustion process and the fire extinguishing process of combustible matters in the converter valve hall;
the gas collection system is used for collecting the concentration of CO and the concentration of O2 in a test scene;
the pressure and flow acquisition system is used for acquiring pressure and flow changes of the water mist atomizing spray head.
7. The simulation system of the fire extinguishing test of the converter valve hall according to claim 6, wherein the temperature acquisition system comprises a first temperature measurement module, a second temperature measurement module, a third temperature measurement module and a data acquisition instrument, the first temperature measurement module is arranged along the vertical central axis of the flame, the second temperature measurement module is arranged along the horizontal central axis of the flame, the third temperature measurement module is arranged along the horizontal central axis of the flame and is perpendicular to the second temperature measurement module, and the first temperature measurement module, the second temperature measurement module and the third temperature measurement module are respectively connected with the data acquisition instrument in a wireless manner to acquire temperature change data of a test site, and each temperature measurement module is loaded on a carrier by a plurality of thermocouples and arranged in a row at intervals; the spacing between each row of adjacent thermocouples is not less than 1m.
8. The simulation system for fire extinguishing test in a converter valve hall according to claim 6, wherein the infrared thermal imaging acquisition system comprises an infrared thermal imager and a computer operation system, the infrared thermal imager transmits the acquired temperature information to the computer operation system to display the temperature change near the fire scene in real time and determine the extinguishing condition of the fire, and/or
The video acquisition system is a camera to record the whole test process and provide supporting data for next step of arrangement and analysis of test data.
9. The simulation system of a fire extinguishing test in a converter valve hall according to claim 6, wherein the gas collection system comprises a smoke analyzer and a smoke collection probe, the smoke collection probe is installed in the test platform, and the smoke analyzer is connected with the smoke collection probe through a wired hose to detect the changes of the concentration of CO and the concentration of O2 in a test scene in the converter valve hall model.
10. The simulation system of a fire extinguishing test in a converter valve hall according to claim 6, wherein the pressure and flow acquisition system comprises a pressure gauge and a pressure and flow sensor, and the pressure gauge, the pressure and flow sensor are installed between the regional control valve group and the atomizing nozzle so as to monitor pressure and flow change of water flow in real time.
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| CN112807597A (en) * | 2020-12-29 | 2021-05-18 | 国网江苏省电力有限公司 | Converter transformer fire foam-water mist fire extinguishing experimental system |
| CN114042276A (en) * | 2021-12-06 | 2022-02-15 | 上海同泰火安科技有限公司 | Fixed fire extinguishing system for extra-high voltage converter substation |
| CN114155760A (en) * | 2021-12-21 | 2022-03-08 | 北京南瑞怡和环保科技有限公司 | Transformer fire experiment platform |
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| CN112327105A (en) * | 2019-08-05 | 2021-02-05 | 苏州电器科学研究院股份有限公司 | Fire and explosion prevention test system and fire extinguishing method for extra-high voltage converter transformer |
| CN112807597A (en) * | 2020-12-29 | 2021-05-18 | 国网江苏省电力有限公司 | Converter transformer fire foam-water mist fire extinguishing experimental system |
| CN114042276A (en) * | 2021-12-06 | 2022-02-15 | 上海同泰火安科技有限公司 | Fixed fire extinguishing system for extra-high voltage converter substation |
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