CN115634407A - 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 78
- 238000004088 simulation Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 239000006260 foam Substances 0.000 claims abstract description 62
- 239000003595 mist Substances 0.000 claims abstract description 26
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 16
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- 239000010959 steel Substances 0.000 description 5
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- 239000000779 smoke Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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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 cannon, 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 a model and simulating various fire conditions and fire loads of fire-catching objects in the model; the water supply unit uniformly mixes water and foam into a mixed liquid and conveys the mixed liquid to the turbofan cannon; the target parameter design unit determines the initial flow of the turbofan cannon, the flow and the pipe diameter of the water supply unit according to the size of the converter valve hall model; the test result confirming unit adjusts the number and the flow of the atomizing nozzles according to the test data acquired by the data acquisition unit, so that the optimal flow and the optimal protection radius of the turbofan cannon under different fire sources under the condition of reduced proportion are determined. And (3) verifying the fire and fire extinguishing conditions of the converter valve halls with different sizes and specifications through a scaling fire entity test, and determining the parameters of the 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 fighting 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. Converter valves are the core equipment in dc converter stations and are expensive. The converter valves are usually installed in a relatively closed valve hall, the investment of the converter valves and the valve hall is almost 1/4 of the investment of the total station, and the protection of the converter valves becomes one of the important points of attention of the direct current converter station. In the converter valve assembly, a plurality of elements such as thyristors, capacitors, resistors, trigger plates and the like exist, and the converter valve can operate in a high-voltage and high-field-intensity environment, and fire disasters caused by discharge, overheating and the like of the converter valve occur. In addition, because a plurality of converter transformers and the converter valve hall are directly communicated, when the converter transformers catch fire, the converter transformers and the converter valve hall are subjected to fireproof plugging and burning through, when a large amount of oil smoke and naked flame enter the valve hall, the top of the valve hall is seriously burnt and collapsed, and after other converter transformer valve side sleeves are broken by collapsed steel beams, the fire in the valve hall spreads to other converter transformers through the damaged sleeve. Therefore, attention should be paid to fire suppression in the converter valve hall.
At present, manual fire extinguishment is mainly adopted for fire disasters of a converter valve hall, and valve towers are used for extinguishment by spraying through a patrol corridor or entering a valve hall by utilizing a lifting platform car. However, the converter valve hall has large area and high height, so that the problems that the artificial fire extinguishing cannot effectively extinguish fire in the initial stage of a fire disaster and the fire extinguishing reliability is poor exist. Aiming at the characteristics of a converter valve hall, namely, not only electric fire but also liquid fire possibly exists, 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 by an image detection technology, so that the problem of response speed is solved; and adopts the mixed liquid of water and foam. The mixed solution has 3 percent water film-forming foam liquid with high fire extinguishing efficiency and environmental protection, and improves the extinguishing effect on oil fire. In addition, the turbofan water mist fire extinguishing system can spray water mist, and the particle size of mist drops is Dv0.50 less than 200 mu m and Dv0.99 less than 400 mu m, so that the system has good fire extinguishing effect and good electrical insulation property on fire disasters of electrical equipment. The turbofan water mist fire extinguishing system adopts a turbofan technology, can realize remote fire extinguishing, and therefore solves the fire extinguishing problem in a large space.
However, the turbofan water mist fire extinguishing system has no standard basis in the aspect of design parameter selection, so that experimental research needs to be carried out. The converter valve hall generally has the area of thousands of square meters and the height of dozens of meters, so that the difficulty of carrying out a series of fire extinguishing tests on an actual project site is high, and in addition, the manufacturing cost problem also exists when manufacturing a large-size test site. Therefore, how to carry out the entity test of the converter valve hall turbofan water mist fire extinguishing system is a great problem.
Disclosure of Invention
Based on this, aiming at the defects of the prior art, 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 problems that the full-size fire extinguishing test cannot be carried out on the converter valve hall due to huge scale of an actual scene and the problem that the simulation result is close to reality by determining fire extinguishing parameters.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a simulation system for a converter valve hall fire test comprises:
the converter valve hall model is used for scaling the size of the investigated converter valve hall to obtain a model, and various fire conditions and fire loads of fire-catching objects in the model are simulated by arranging combustible materials inside the model;
the turbofan cannon is arranged on the converter valve hall model and used for aligning the jet orifice of the atomizing nozzle of the turbofan cannon to the fire-catching object in the converter valve hall model to carry out 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, and the output ends 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 the turbofan cannon, and the turbofan cannon and the water supply unit jointly form a turbofan water mist fire extinguishing system;
the target parameter design unit is used for determining the initial flow of the turbofan cannons, the flow and the pipe diameter of the water supply unit according to the size of the converter valve hall model, wherein the initial flow of the turbofan cannons is configured to be obtained by multiplying the preset spray intensity by the area of the converter valve hall model and dividing the area by the number of the turbofan cannons in the place, and the flow value of each turbofan cannon is determined; the flow rates of the water supply pump set and the foam pump set are configured to be determined based on the flow rate value of the turbofan cannon and the preset flow rate ratio of the water supply pump and the foam pump, and the input pipe diameters of the regional control valve set are determined through the flow rates of the water supply pump set and the foam pump set;
the data acquisition unit is used for acquiring the position of the preset flame and the temperature, CO concentration and O2 concentration change of a test scene;
and the test result confirming unit is used for adjusting the number and the flow of the atomizing nozzles according to the test data acquired by the data acquisition unit, so that the optimal flow and the optimal protection radius of the turbofan cannon under different fire sources under the condition of reduced proportion are determined, and test basis is provided for the design of turbofan water mist fire extinguishing systems in different converter valve halls.
In one embodiment, the turbofan cannon is fixed on a side wall of the converter valve hall model and comprises an electrical control cabinet, an atomizing nozzle, a pitching movement mechanism, a rotation movement mechanism and a base, wherein the atomizing nozzle is rotatably arranged on the base, the pitching movement single mechanism is used for adjusting the pitching movement angle of the atomizing nozzle, the rotation 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 rotation movement mechanism.
In one embodiment, the number of the atomizing spray heads is multiple, and the multiple atomizing spray heads are configured to adjust the number of the spray heads and the flow rate according to the type, the position and the flame power of the fire.
In one embodiment, the water supply pump unit and the foam pump unit respectively provide a water source and a foam source for the atomizing spray head, and both the water source and the foam source are used and prepared, and the flow ratio of the 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 1.2MPa of the turbofan cannon, and determining the design pressure of the water pump and the foam pump.
In one embodiment, the regional control valve group comprises a water inlet pipeline, a foam pipeline, a proportional mixer, a mixed liquid outlet pipeline and a drainage debugging ball valve arranged on the mixed liquid outlet pipeline, a first input end of the proportional mixer is connected with a water supply pump group through the water inlet pipeline, a second input end of the proportional mixer is connected with the foam pump group through the foam pipeline, an output end of the proportional mixer is connected with the atomizing nozzle through the mixed liquid outlet pipeline, the regional control valve group is used for realizing accurate mixing of water and foam and realizing water quantity regulation 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 change in the converter valve hall model;
the infrared thermal imaging system is used for positioning the fire center direction, the combustion degree and the extension condition and determining the fire state;
the video acquisition system is used for recording the combustion and fire extinguishing processes of combustible materials in the converter valve hall;
the gas acquisition system is used for acquiring the CO concentration and the O2 concentration of a test scene;
the pressure and flow acquisition system is used for acquiring the pressure and flow change 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 a flame, the second temperature measurement module is arranged along a transverse central axis of the flame, the third temperature measurement module is arranged along the transverse central axis of the 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 is arranged in a row at intervals; the spacing between adjacent thermocouples in each row 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 so as to display the temperature change near a fire scene in real time and judge the extinguishing condition of the fire and/or judge the extinguishing condition of the fire
The video acquisition system is a camera for recording the whole test process and providing support data for the next step of sorting and analyzing 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 CO concentration and O2 concentration change of a test scene in a converter valve hall model.
In one embodiment, the pressure and flow rate collecting system comprises a pressure gauge and a pressure and flow rate sensor, and the pressure gauge, the pressure and flow rate sensor are arranged between the regional control valve group and the turbofan cannon so as to monitor the pressure and flow rate change of water flow in real time.
Compared with the prior art, the invention has the beneficial effects that: the model scaling converter valve hall model simulates a fire scene, can simulate the fire working conditions of various converter valve hall engineering projects, and solves the problem that the converter valve hall engineering projects are large in size and difficult to simulate; the invention not only makes the scale reduction for different converter valve halls, but also makes the scale reduction for the flow of the pump set and the pipe network system and the flow of the atomizing nozzle in the turbofan cannon, so that the simulation effect is the same as the actual project, and accurate basis is provided for determining the design of the turbofan water mist fire extinguishing system for the actual project of the converter valve hall. The turbofan cannon can research the fire extinguishing effect under the conditions of constant pressure and variable flow; and a temperature, video, thermal imaging, gas, pressure and flow data acquisition system is arranged, so that detailed data in the test process is acquired, and a basis is provided for determining design parameters of the turbofan water mist fire extinguishing system for actual projects of the converter valve hall.
Drawings
Fig. 1 is a schematic diagram of a simulation system for a fire extinguishing test of a converter valve hall according to the present invention.
FIG. 2 is a schematic view of the connection between the turbofan cannon and a water supply system of the present invention.
FIG. 3 is a schematic structural diagram of a simulation system for a fire extinguishing test of a converter valve hall according to the invention.
The reference numbers illustrate:
the system comprises a data acquisition unit 1, a foam tank 2, a water supply pump unit 3, a foam pump unit 4, a regional control valve unit 5, a turbofan 6, a converter valve hall model 7, a temperature acquisition system 8, an infrared thermal imaging acquisition system 9, an infrared thermal imager 91, a video acquisition system 10, a gas acquisition system 11, a smoke acquisition probe 111, a smoke analyzer 112, a pressure and flow acquisition system 12, a pressure gauge 121 and a pressure and flow sensor 122.
Detailed Description
The drawings in the embodiment of the invention are combined to explain two major components in the embodiment, namely a turbofan water mist fire extinguishing system diagram and a converter valve hall model diagram in detail.
In the prior art, as the converter valve hall is oversize, the fire test requirements of the same size cannot be met in domestic fire test sites at present. Therefore, the invention provides a simulation system for a fire extinguishing test of a converter valve hall, which acquires detailed data in the test process through a data acquisition system and provides 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 valve hall fire test includes: the system comprises a converter valve hall model, a turbofan cannon, 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 carrying out scaling on the size of the investigated converter valve hall to obtain a model, and combustible substances are arranged inside the model to simulate various fire conditions and fire loads of fire-catching substances in the scaling model; the turbofan cannon is arranged on the converter valve hall model and used for aligning the jet orifice of the atomizing nozzle of the turbofan cannon to the fire catching object in the converter valve hall model to carry out fire extinguishing operation; the water supply unit comprises a water supply pump set, a foam tank and a regional 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 ends of the water supply pump set and the foam pump set are connected with the input end of the regional control valve set, so that water and foam are uniformly mixed through the regional control valve set to form a mixed liquid, the mixed liquid is conveyed to the turbofan cannon, and the turbofan cannon and the water supply unit jointly form a turbofan water mist fire extinguishing system;
the target parameter design unit is used for determining the initial flow of the turbofan cannons, the flow and the pipe diameter of the water supply unit according to the size of the converter valve hall model, wherein the initial flow of the turbofan cannons is configured to be obtained by multiplying the preset spray intensity by the area of the converter valve hall model and dividing the area by the number of the turbofan cannons in the place, and the flow value of each turbofan cannon is determined; predetermined spray intensity is actual project normal water spray fire extinguishing systems's spray intensity, and this is because water spray fire extinguishing systems spray intensity is greater than foam fire extinguishing systems, water mist fire extinguishing systems, can calculate a turbofan big or small value according to water spray fire extinguishing systems spray intensity promptly, reduces turbofan big or small flow according to the condition of putting out a fire afterwards. The flow of the water supply pump set and the flow of the foam pump set are configured to be determined based on the flow value of the turbofan cannon and the preset flow ratio of the water supply pump to the foam pump, and the input pipe diameter of the regional control valve set is determined through the flow of the water supply pump set and the flow of the foam pump set; calculating the pipe diameter of the water supply pump group pipe network according to the pipe flow speed in the specification; the pipe diameter of the foam pump group is calculated according to the pipeline flow speed in the specification, the water inlet pipeline and the foam pipeline pipe diameter of the area control valve group correspond to the water supply pump group and the foam pump group, and the mixed liquid outlet pipe diameter corresponds to the flow of the turbofan cannon. The data acquisition unit is used for acquiring the position of a preset flame and the temperature, CO concentration and O2 concentration change of a test scene; the test result confirming unit is used for adjusting the number and the flow of the atomizing nozzles according to the test data acquired by the data acquisition unit, so that the optimal flow and the optimal protection radius of the turbofan cannon under different fire sources under the condition of reduced proportion are determined, and test basis is provided for the design of turbofan water mist fire extinguishing systems in different converter valve halls. .
The simulation system for the fire extinguishing test of the converter valve hall not only makes a scaling proportion for the size of the converter valve hall, but also makes a scaling proportion for the flow of the pump group, the pipe network system and the atomizing spray head, so that the simulation effect is the same as the actual project, the temperature and the gas concentration after the scaling proportion in the test result are the same as 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. The extinguishing effect can be quantitatively checked by confirming that the open fire disappears and attaching the temperature and gas concentration change.
In the present embodiment, first, the scale data is obtained from the investigated converter valve hall size and the test site size (model). The flow of the atomizing spray head is scaled according to the preset spraying intensity, and the relevant flow of the water supply pump and the foam pump, the pipe diameter of the pipe network and the specification of the area control valve group are obtained according to the scaling. The turbofan cannon firstly determines a large flow, and then determines a reasonable flow parameter according to the reduction of the flow in the fire test result. In this process, the net foam tank volume is determined based on 3% of the atomizer head flow and considering the time of the blow, which may be 22min or the like. The size of the converter valve hall model is determined, 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 the change of the number of the atomizing spray heads and the flow of the spray heads; in order to ensure that the pressure at the tail end of the system, namely the pressure of the atomizing spray head, is not changed, the water quantity is adjusted by adjusting the drainage 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 conditions of different fire sources of the scaled model through an entity 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 purpose of simulating different converter valve hall projects is achieved. In order to record and analyze the test process and the test 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 down the size of the converter valve hall, the pump set, the pipe network system and the turbofan cannon flow are scaled down, so that the matching performance is achieved.
For example, consider a single valve hall having a plan dimension of 50m by 24m (length by width) and an overall height of about 21m. Each valve hall is provided with 6 valve towers, each valve tower is provided with a turbofan cannon, the plane size of each valve tower is about 9.8m multiplied by 6.2m (length multiplied by width), and the height is about 13.2m. The converter valve hall can be scaled by 0.5, the converter valve hall model is 25m long, 12m wide and 10.5m high, wherein if a valve tower is involved in the converter valve hall model, the scaling can be performed by 0.5, so that the height proportion of the turbofan cannon in the converter valve hall model and the actual project is kept consistent. Secondly, determining the flow data of the turbofan cannon, and calculating the type of the pump set, wherein the pump set cannot be adjusted after being selected. Since the flow is of a large value. When subsequently tested in a comparative test of different turbofan cannon parameters, it was only good to reduce the flow. For the turbofan cannon, the method for reducing the flow comprises the following steps: firstly, the number of nozzles (atomizing nozzles) is reduced, and the nozzles can be blocked by plugs; and secondly, the flow of the nozzle is reduced. Because the spray intensity of the water spray fire-extinguishing system is greater than that of a foam fire-extinguishing system and a water spray fire-extinguishing system, the spray intensity of the water spray fire-extinguishing system (20L/min square meter, 14.14L/min square meter after being reduced to a square meter) is multiplied by the area of a converter valve hall model, the area is divided by the number of turbofan cannons in the place to obtain the flow value of each turbofan cannon, the flow of each nozzle is determined according to the number of the nozzles of the turbofan cannons, and the pipe diameter and the pump set are determined according to the flow in the place. If the converter valve hall model area is 300 square meters after the scale is reduced, the flow of each turbofan cannon is 11.79L/s, and the regional control valve group realizes that water and foam are 97 percent: mixing the mixture in a proportion of 3 percent, and considering that 2 turbofan cannons act at most in the case of fire, the flow of a foam pump is 0.7L/s, and the flow of a water pump is 22.87L/s; the flow rate of the regional control valve group is 11.79L/s (consider that one valve group corresponds to one turbofan cannon).
As shown in figure 3, the converter valve hall model is built by a geometric space, the converter valve hall model is mainly made of a color steel plate and a reinforced concrete wall, the reinforced concrete wall is only adopted on one side wall provided with the atomizing nozzle, and the color steel plate is 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; and a camera is arranged at the observation window and used for recording the test process. The converter valve hall model also comprises a fire source model, and the fire source model simulates various fire conditions and fire loads of fire-catching objects in the model through combustible materials, for example, the fire source type such as liquid fire or electric fire, the fire source power and the fire source position can be changed, so that the purpose of truly simulating the actual engineering project fire is achieved; 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 protective radius of the atomizing nozzle according to the position of the fire source. It is to be understood that the above-mentioned combustible simulation fire source is a fire source type and its location which are easy to occur in the converter valve hall determined by actual research. When the converter valve halls with other sizes are simulated, the color steel plate can be moved, so that the test conditions under different sizes of the converter valve halls can be simulated. When the simulation of the valve hall of the 3-seat valve tower is 25m multiplied by 24mx21m (length multiplied by width multiplied by x height), the scale can be reduced according to the scaling ratio of 0.5, and the model of the valve hall after the scale is reduced is 12.5m multiplied by 12mx10.5m (length multiplied by width multiplied by 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 area control valve group; the regional control valve group realizes that foam and water are in a ratio of 3%:97 percent of the mixture is mixed, and the flow of a pipe network can be adjusted through a drainage ball valve. The output end of the area control valve group is connected with the input end of the turbofan cannon, and the jet orifice of the turbofan cannon is aligned to the flame of the test platform to conduct fire extinguishing operation.
The pressure and flow acquisition system 12 is used for acquiring pressure and flow changes of the water mist atomizing nozzles. The pressure and flow acquisition system 12 comprises a pressure gauge 121 and a pressure and flow sensor 122, wherein the pressure gauge is installed at the input end of the turbofan cannon, and the pressure and flow sensor is installed between the pressure gauge and the regional control valve group. Through the signal feedback, the pressure and the 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 used and prepared. The foam pump set comprises a gate valve, a Y-shaped filter, a rubber soft joint, an eccentric reducer, a concentric reducer, 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 reducer, a concentric reducer, 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 fire center direction, the combustion degree and the extension condition and determining the fire state; the video acquisition system is used for recording the combustion and fire extinguishing processes of combustible materials in the converter valve hall; the gas acquisition system is used for acquiring the CO concentration and the O2 concentration of a test scene; the pressure and flow acquisition system is used for acquiring the pressure and flow change of the water mist atomizing spray head.
Specifically, the temperature acquisition system 8 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 mode to acquire temperature change data of a test site. The number of thermocouples in the temperature measurement module is determined according to the scale reduction value and the acquisition accuracy, and the thermocouple interval in the corresponding actual project is not less than 1m.
The gas collection system 11 comprises a flue gas analyzer and a flue gas collection probe, wherein the flue gas 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 the temperature change near a fire scene in real time and judge the extinguishing condition of a fire. The video acquisition system is a camera for recording the whole test process and providing support data for further processing, sorting and analyzing test data.
The turbofan cannon is fixed in the middle of the top of the concrete wall of the converter valve hall model by a fixing device. The fixing device comprises a mounting bracket fixed on the top of the reinforced concrete wall, and an atomizing nozzle and the mounting bracket are connected and fixed by bolts. The angle can be automatically controlled through the electric control cabinet, the pitching motion angle of the atomizing nozzle is adjusted through the pitching motion unit in the atomizing nozzle, and the horizontal rotation angle is adjusted through the rotary motion unit. It should be understood that the pitching movement unit and the rotating movement unit are both in the prior art, and the prior art only needs a mechanical structure for realizing the functions of the pitching movement angle and the horizontal rotation angle of the atomizing nozzle.
Therefore, in the embodiment, the simulation system for the fire extinguishing test of the converter valve hall is arranged, the scaled model is adopted to simulate the fire of the converter valve hall, and the scaled turbofan water mist fire extinguishing system is used for the fire extinguishing test so as to determine the design parameters of the atomizing nozzles under the fire of different converter valve halls, including flow, protection radius and the like, and provide data support for the fire protection of the converter valve hall of practical projects. The converter valve hall model, the atomizing nozzle parameters and the actual project after the test verification are scaled according to equal proportion, so as to achieve the aim of guiding the actual project.
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 attributes 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 extinguishing test of a converter valve hall is characterized by comprising:
the converter valve hall model is used for scaling the size of the investigated converter valve hall to obtain a model, and simulating various fire conditions and fire loads of fire-catching objects in the model by arranging combustible materials inside the model;
the turbofan cannon is arranged on the converter valve hall model and used for aligning the jet orifice of the atomizing nozzle of the turbofan cannon to the fire-catching object in the converter valve hall model to carry out fire extinguishing operation;
the water supply unit comprises a water supply pump set, a foam tank and a regional 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 ends of the water supply pump set and the foam pump set are connected with the input end of the regional control valve set, so that water and foam are uniformly mixed into mixed liquid through the regional control valve set and are conveyed to the turbofan cannon, and the turbofan cannon and the water supply unit jointly form a turbofan water mist fire extinguishing system;
the target parameter design unit is used for determining the initial flow of the turbofan cannons, the flow and the pipe diameter of the water supply unit according to the size of the converter valve hall model, wherein the initial flow of the turbofan cannons is configured to be obtained by multiplying the preset spray intensity by the area of the converter valve hall model and dividing the area by the number of the configured turbofan cannons to obtain the flow value of each turbofan cannon and determine the flow of each atomizing nozzle of the turbofan cannon; the flow of the water supply pump set and the flow of the foam pump set are configured to be determined based on the flow value of the turbofan cannon and the preset flow ratio of the water supply pump to the foam pump, and the input pipe diameter of the regional control valve set is determined through the flow of the water supply pump set and the flow of the foam pump set;
the data acquisition unit is used for acquiring the position of the preset flame and the temperature, CO concentration and O2 concentration changes of a test scene;
and the test result confirming unit is used for adjusting the number and the flow of the atomizing nozzles 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 cannon under the condition of different fire sources under the shrinking proportion and provide test basis for the design of the turbofan water mist fire extinguishing system in different converter valve halls.
2. The simulation system of the fire extinguishing test of the converter valve hall as recited in claim 1, wherein the turbofan cannon is fixed on a side wall of the converter valve hall model, the turbofan cannon comprises an electrical control cabinet, an atomizing nozzle, a pitching movement mechanism, a rotary movement mechanism and a base, the atomizing nozzle is rotatable and 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 movements of the pitching movement mechanism and the rotary movement mechanism.
3. The simulation system of a valve hall fire test according to claim 2, wherein the number of the atomizer nozzles is plural, and the plural atomizer nozzles are configured to adjust the number of the nozzles and the flow rate according to the type of fire, the location and the flame power.
4. The simulation system for fire extinguishing tests 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 nozzles, the water source and the foam source are used and prepared, and the flow ratio of a single water supply pump to a single 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 for the fire extinguishing test of the converter valve hall as claimed in claim 1, wherein the zone control valve set comprises a water inlet pipeline, a foam pipeline, a proportional mixer, a mixed liquid outlet pipeline and a drainage debugging ball valve arranged on the mixed liquid 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 the atomizing nozzle of the turbofan cannon through the mixed liquid outlet pipeline, the zone control valve set is used for realizing the precise mixing of water and foam, and realizing the water quantity regulation by opening the drainage ball valve, so that the pressure of the atomizing nozzle is not changed when the flow is reduced.
6. The simulation system for the fire extinguishing test of the converter valve hall as recited in 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 change in the converter valve hall model;
the infrared thermal imaging system is used for positioning the fire center direction, the combustion degree and the extension condition and determining the fire state;
the video acquisition system is used for recording the combustion and fire extinguishing processes of combustible materials in the converter valve hall;
the gas acquisition system is used for acquiring the CO concentration and the O2 concentration of a test scene;
the pressure and flow acquisition system is used for acquiring the pressure and flow change of the water mist atomizing spray head.
7. The simulation system for 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 a vertical central axis of the flame, the second temperature measurement module is arranged along a transverse central axis of the flame, the third temperature measurement module is arranged along the transverse central axis of the 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 so as 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 is arranged in a row at intervals; the spacing between adjacent thermocouples in each row is not less than 1m.
8. The simulation system for fire extinguishing test of converter valve hall according to claim 6, wherein the infrared thermal imaging acquisition system comprises an infrared thermal imager and a computer operating system, the infrared thermal imager transmits acquired temperature information to the computer operating system to display the temperature change near the fire scene in real time and judge the extinguishing condition of the fire and/or judge the extinguishing condition of the fire
The video acquisition system is a camera for recording the whole test process and providing support data for the next step of sorting and analyzing test data.
9. The simulation system of a fire extinguishing test of a converter valve hall as recited in claim 6, wherein the gas collection system comprises a flue gas analyzer and a flue gas collection probe, the flue gas collection probe is installed in the test platform, and the flue gas analyzer and the flue gas collection probe are connected through a wired hose to detect changes of CO concentration and O2 concentration of a test scene in the model of the converter valve hall.
10. The simulation system for the fire extinguishing test of the converter valve hall as claimed in 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 area control valve group and the atomizing spray head so as to monitor the pressure and flow change of water flow in real time.
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| CN202211243752.1A CN115634407B (en) | 2022-10-11 | 2022-10-11 | Simulation system for fire extinguishing test of converter valve hall |
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| CN202211243752.1A CN115634407B (en) | 2022-10-11 | 2022-10-11 | Simulation system for fire extinguishing test of converter valve hall |
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| 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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