RU2783939C1 - Experimental platform for transportation of powder fire extinguishing agent - Google Patents

Abstract

FIELD: fire protection.

SUBSTANCE: invention relates to an experimental platform for transporting a powder fire extinguishing agent containing a device (1) for fluidization and injection, made with the possibility of generating a dry powder extinguishing agent for spraying, and the device (1) for fluidization and injection contains: a container (11) for fluidization having an inlet for a dry powder component, an inlet for a gas component and outlet for dry powder extinguishing agent and made with the possibility of fluidization of the specified dry powder component; experimental pipeline device (2) located at the outlet of the device (1) for fluidization and injection and having a detachable connection for the pipeline made with the possibility of attaching the transportation pipeline to be tested; and a recirculation and transfer device (3) located at the outlet of the experimental pipeline device (2) for the purpose of collecting the specified dry powder fire extinguishing agent, separating the components of the specified dry powder fire extinguishing agent from each other and transferring the separated dry powder component to the specified device (1) for fluidization and injection; moreover, the specified device (3) for recirculation and transfer includes: a separation unit (31), made with the possibility of separating the dry powder component from the gas component in the specified dry powder fire extinguishing agent; and a container (32) for dry powder, located below the separation unit (31) and made with the possibility of collection and storage of the specified dry powder component separated by means of a separation unit (31); a screw conveyor (35) powered by an engine and made with the possibility of transporting the specified dry powder component from the specified container (32) for dry powder to the inlet for the powder component of the specified container (11) for fluidization; and an electric control unit (36) made with the possibility of controlling the operation and speed of transportation of the specified screw conveyor (35) using the specified electric motor.

EFFECT: expansion of the range of fire extinguishing solutions.

11 cl, 1 dwg

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application is based on and claims priority of China Patent Application No. CN201910392551.X filed May 13, 2019, the contents of which are hereby incorporated by reference in their entirety.

FIELD OF TECHNOLOGY

[0002] The present invention relates to the field of fire extinguishing, in particular, to an experimental platform for transporting powder fire extinguishing agent.

BACKGROUND OF THE INVENTION

[0003] Among the fire extinguishing materials represented by the dry powder and nitrogen fire extinguishing agent, it is the powder material that can produce the effect of chemical inhibition and negative catalysis to interrupt the chemical reaction or form a glassy coating layer under the influence of high temperature to isolate the fire zone, and nitrogen high pressure can make it possible to uniformly atomize said powder material at a certain fluidized speed, and the high pressure nitrogen itself can also produce an insulating effect to a certain extent. Therefore, a fire extinguishing device using a two-phase flow of dry powder and nitrogen as an extinguishing agent, which can be used to extinguish fires originating from combustible liquids (such as oils, liquid hydrocarbons, alcohols, esters and ethers), combustible gases (such as liquefied petroleum gas, natural gas and coal gas) and electrical appliances, has a wide range of applications.

[0004] There are several patents or applications that cover variants of an experimental dry powder delivery platform. For example, Japanese Patent Application Publication No. JPS6329667A discloses a powder fire extinguishing equipment test apparatus including a powder extinguishing agent extraction part. The powder fire extinguishing agent extracting part includes: a supplying part for directing the powder fire extinguishing agent discharged from the powder fire extinguishing agent storage container to the outlet head from the pipeline to the powder fire extinguishing agent extracting part; a separating portion that separates the powder fire extinguishing agent and the compressed gas introduced by the supply portion and discharges the separated compressed gas to the outside; and a recovery container for storing powder fire extinguishing agent, separated by a separating part.

SUMMARY OF THE INVENTION

[0005] In one aspect of the present invention, an experimental platform for transporting a dry powder fire extinguishing agent is provided. Said experimental platform includes: a fluidization and injection device configured to generate a powder fire extinguishing agent for spraying; an experimental piping device located at the outlet of said device for fluidization and injection and having a detachable pipeline connection for attaching a transport pipeline to be tested; and a recirculation and transfer device located at the outlet of said experimental piping device for the purpose of collecting said powder fire extinguishing agent, separating the components of said powder fire extinguishing agent from each other, and transferring said separated dry powder component to said fluidization and injection device.

[0006] In some embodiments of the present invention, said recycling and transfer device includes: a separation unit configured to separate a powder component from a gas component in said powder extinguishing agent; and a dry powder container disposed under said separation unit and configured to accumulate and store said powder component separated by said separation unit.

[0007] In some embodiments of the present invention, said separation unit comprises: fire extinguishing agent inlets configured to introduce said powder fire extinguishing agent into said separation unit; outlets for gas, configured to remove the specified separated gas component from the specified separation unit; and outlets for dry powder located below said outlets for gas in the vertical direction and configured to withdraw said separated powder component from said separation unit.

[0008] In some embodiments of this invention, the specified separation unit contains: a cyclone separator configured to separate the components of the specified powder extinguishing agent in accordance with the magnitude of the centrifugal force through a rotational effect; and a bag-type dust collector capable of separating the components of said powder fire extinguishing agent according to volume based on the filtration principle.

[0009] In some embodiments of the invention, said separation unit comprises: a primary separation device provided with a first extinguishing agent inlet, a first gas outlet, and a first dry powder outlet; and a secondary separation device provided with a second inlet for extinguishing agent, a second outlet for gas, and a second outlet for dry powder; wherein said second extinguishing agent inlet is in communication with said first gas outlet such that said secondary separation device performs secondary separation of said gas component separated by said primary separation device.

[0010] In some embodiments of this invention, said primary separation device includes: a cyclone separator configured to separate a powder component with a particle diameter greater than a first predetermined diameter from said powder extinguishing agent; said secondary separation device includes: a bag filter configured to further separate a powder component with a particle diameter larger than a second predetermined diameter based on separation of said cyclone separator; wherein the value range of said first predetermined diameter is from 5 to 15 microns, and the value range of said second predetermined diameter is greater than 0.4 microns.

[0011] In some embodiments of the present invention, said experimental platform further comprises: a pipeline pressure control device located at the outlet of said experimental pipeline device, wherein said pipeline pressure control device includes a first ball valve for adjusting the pressure of said powder extinguishing agent flowing through said first ball valve.

[0012] In some embodiments of the present invention, said fluidizing and injecting apparatus includes: a fluidizing vessel having a powder component inlet, a gas component inlet, and a powder extinguishing agent outlet, and configured to fluidize said powder component; and a high pressure gas source connected to said gas component inlet through a second ball valve and configured to control the gas component inlet pressure.

[0013] In some embodiments of the present invention, said recycling and transfer device includes: a screw conveyor driven by a motor and configured to convey a powder component from said dry powder container to said powder component inlet of said fluidizing container; and an electrical control unit configured to control the operation and transport speed of said screw conveyor by said electric motor.

[0014] In some embodiments of the present invention, said powder component inlet in said fluidization vessel is located above said gas component inlet in the vertical direction, and said screw conveyor is configured to raise the level of said powder component and pour said powder component into said inlet for the powder component of said fluidization vessel from top to bottom in the vertical direction.

[0015] In some embodiments of the present invention, a third ball valve is provided between said screw conveyor and the dry powder container to control the transfer of said powder component from said dry powder container to said screw conveyor.

[0016] In some embodiments of the invention, said test platform further comprises a control and detection system, said control and detection system including: a first weighing device configured to weigh said dry powder container; a second weighing device configured to weigh said fluidization vessel; a pressure measurement device, configured to measure the pressure at the outlet of the specified experimental pipeline device; a speed measurement device, configured to measure the speed at the input of the specified device for recycling and transmission; and a data collection device communicatively connected to said first weighing device, second weighing device, pressure measuring device and speed measuring device and configured to collect weight data of said dry powder container, weight data of said fluidization container, data on outlet pressure of said experimental piping device and inlet speed data of said recirculation and transfer device and display on the display the indicated weight of said dry powder container, the weight of said fluidization vessel, the outlet pressure of said experimental piping device and the inlet velocity of said devices for recycling and transmission.

[0017] In some embodiments of the present invention, said control and detection system further includes: a control device communicatively connected to said data acquisition device and configured to control the rotation speed of said electric motor and control the degree of opening of said first ball valve, second a ball valve and a third ball valve, in accordance with a predetermined program based on the specified weights of said dry powder container, the weight of said fluidization vessel, the outlet pressure of said pilot pipeline device, and the inlet velocity of said recirculation and transfer device.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0018] The accompanying drawings described herein are intended to provide a further understanding of the present invention and form part of the present invention. The exemplary embodiments of the present disclosure, as well as their descriptions, which are intended to explain the present invention, are not inappropriate definitions with respect to the present invention.

[0019] In the accompanying drawings:

[0020] FIG. 1 illustrates a schematic structural representation of an experimental dry powder transport platform provided by some embodiments of the present invention.

[0021] Reference numerals respectively denote:

[0022] 1. Fluidization and injection device, 11. Fluidization tank, 12. High pressure gas source, 13. Second ball valve;

[0023] 2. Experimental pipeline device, 21. Pipeline pressure control device, 211. First ball valve;

[0024] 3. Recirculation and transfer device, 31. Separation unit, 32. Dry powder container, 33. Cyclone separator, 331. First inlet for extinguishing agent, 332. First outlet for gas, 333. First outlet for dry powder , 34. Bag type dust collector, 341. Second extinguishing agent inlet, 342. Second gas outlet, 343. Second dry powder outlet, 35. Screw conveyor, 36. Electrical control box, 37. Third ball valve;

[0025] 4. Control and detection system, 41. First weighing device, 42. Second weighing device, 43. Pressure measuring device, 44. Speed measuring device, 45. Data acquisition device.

DETAILED DESCRIPTION

[0026] The technical solution in these embodiments of the present invention will be clearly and fully described below in conjunction with the accompanying drawings as embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all embodiments. The following descriptions of at least one exemplary embodiment, while in fact purely illustrative, should in no way serve as a limitation of the present invention or its application or use. On the basis of these embodiments of the present invention, all other embodiments obtained by experts in the art, provided that no inventive effort, fall within the scope of the legal protection of the present invention.

[0027] Unless otherwise indicated, the relative positions, numerical expressions, and numerical values of the components and steps described in these examples do not limit the scope of the present invention. At the same time, it should be borne in mind that for convenience of description, the dimensions of the various parts shown in the accompanying drawings do not correspond to real proportional relationships. Technologies, methods and devices known to those skilled in the art may not be discussed in detail. However, where appropriate, these technologies, methods and devices should be considered as part of the above description. Among all the examples illustrated and discussed herein, any particular meaning is to be construed as exemplary only and not as limiting. Thus, other examples in these exemplary embodiments may have other meanings. It should be noted that: Like reference numerals and letter designations represent like elements in the following attached drawings, and therefore, when any element is defined in one attached drawing, further discussion of the same should be made in subsequent attached drawings.

[0028] The powder fire extinguishing apparatus known to the inventors is equipped with a powder extinguishing agent tank, a connecting pipeline, and a dry powder spraying device. When the characteristics of the material of the specified extinguishing agent are determined, its extinguishing effect will depend on parameters such as resistance, range and coverage of the specified powder extinguishing agent sprayed by the specified dry powder spray device (including, but not limited to, powder fire monitor, powder fire nozzle or a three-phase water piercing fire hose). These parameters are determined by interfacing said dry powder sprayer of the installed model and characteristics with the state of supplying dry powder and nitrogen before entering said sprayer. The matching and selection of said dry powder spray device is carried out by selecting the appropriate dry powder spray device mainly based on the fire extinguishing performance requirements of said fire extinguishing device, that is, the appropriate dry powder spray device is selected based on the working pressure range, equivalent spray rate (kg/s), range, range of longitudinal/rotary movement and control method suitable for said dry powder spray device. Thus, after completion of the matching and selection of said spray device, the fire extinguishing effect of said fire extinguishing device will depend on the state of supply of dry powder and nitrogen before entering said dry powder spray device.

[0029] Before transporting said dry powder and nitrogen based fire extinguishing agent to said dry powder spraying apparatus, at least the following preparation steps are required: filling said fluidizing container with dry powder, filling said fluidizing container with gas using a high nitrogen storage tank pressure, fluidizing said dry powder in said fluidizing vessel, and opening an outlet of said fluidizing vessel to allow a two-phase flow of dry powder and nitrogen to enter said conveying conduit. It can be seen that said state of supply of said two-phase flow of dry powder and nitrogen at the inlet of said apparatus for spraying is highly dependent on the effect of fluidization in said fluidization vessel on said dry powder and the effect of transport through said pipeline on said two-phase flow of dry powder and nitrogen.

[0030] On this basis, in order to evaluate and optimize the effectiveness of said powder fire extinguishing device, an experimental platform is set up that can study the effect of said fluidization tank on dry powder fluidization and the effect of said pipeline on dry powder and nitrogen two-phase flow, namely, experimental platform corresponding to the physical size. However, since the diffusion of dry powder caused by sprayed powder fire extinguishing agent can not only cause dust pollution in the environment, but also easily lead to serious damage to the respiratory organs of experiment participants, there is currently no safe and reliable experimental platform. As a supplement, the cost of powder fire extinguishing agent is relatively high (about 20,000 RMB per ton). Multiple spraying is required to complete the fluidization test, and to transport and move said dry powder, so the cost of this process is too high, which is also an important reason for the lack of an experimental platform for pumping and transporting dry powder with any physical dimensions.

[0031] FIG. 1 illustrates a schematic structural representation of an experimental dry powder transport platform provided by some embodiments of the present invention. As shown in FIG. 1, the present invention provides an experimental powder fire extinguishing agent transport platform, comprising: a fluidization and injection device 1 configured to generate a powder fire extinguishing agent to be sprayed; an experimental piping device 2 located at the outlet of said fluidization and injection device 1 and having a detachable piping connection for attaching a conveying pipeline to be tested; and a device 3 for recirculation and transfer, located at the outlet of the specified experimental pipeline device 2 for the purpose of collecting the specified powder fire extinguishing agent, separating the specified powder fire extinguishing agent and the gas transported with it from each other and transferring the specified separated dry powder component to the specified device 1 for fluidization and injection.

[0032] Based on the above embodiments, embodiments of the present invention can realize the processing of said dry powder, thereby reducing the cost of the dry powder transportation experiment and ensuring the safety of personnel and the environment during said experiment.

[0033] A typical powder fire extinguishing agent includes a fire extinguishing composition consisting of dry powder and nitrogen. Due to the interaction of the solid and gas components, it is possible to greatly optimize the extinguishing efficiency of said extinguishing agent and adapt to the requirements of fire extinguishing under diverse and difficult conditions. As is known, the spraying process of the specified powder fire extinguishing agent is a pneumatic conveying process having a fire extinguishing effect associated with the process of preparation, mixing and transportation carried out before entering the specified spraying device.

[0034] In particular, before spraying said powder fire extinguishing agent, at least the following steps must be completed: filling said fluidizing container 11 with dry powder, filling said fluidizing container 11 with gas from said high pressure nitrogen storage cylinder, fluidizing said dry powder into said fluidization vessel 11 and opening the outlet of said fluidization vessel 11 to allow said dry powder and nitrogen two-phase flow to enter said conveying pipeline. With this in mind, the fluidizing and inflating apparatus 1 of the present invention is used to carry out the three steps of filling said fluidizing container 11 with dry powder, filling said fluidizing container 11 with gas from said high pressure nitrogen storage cylinder, and fluidizing said dry powder inside said fluidizing vessel 11 to create a two-phase flow of dry powder and nitrogen, which can be sprayed as a powder extinguishing agent for a subsequent transport experiment.

[0035] As a result of the operation of said fluidization and injection device 1, said experimental piping device 2 provides a test object mounting position for said experimental platform for transportation through said detachable pipeline connection to facilitate carrying out a transportation experiment with a pipeline diameter and a pipeline direction as variables or a common piping system as a variable.

[0036] In particular, said detachable pipeline connection can be mounted on experimental pipelines having different pipeline diameters and various pipeline directions in order to study the effect of changing the diameter and direction of said pipeline on the transport capacity of said powder extinguishing agent, to create an experimental data base of the specified pipeline in various injection systems of fire trucks that use powder fire extinguishing systems, subject to control of the flow characteristics at the inlet of the specified experimental pipeline device 2, that is, ensuring constant values of pressure, flow rate, ratio and degree of fluidization of the specified powder fire extinguishing agent. Accordingly, by controlling the stability of said experimental conduit assembled in said experimental conduit device 2, various inlet flow characteristics can be studied by changing the inlet parameters of said experimental conduit device 2. That is, said conveying capacity of said experimental conduit with respect to said powder extinguishing agent can be studied at different flow rates, different pressures, different ratios and different states of fluidization of the specified powder extinguishing agent.

[0037] The above-described changes in the shape parameters of the specified experimental pipeline and the specified flow characteristics at the inlet of the specified experimental pipeline device 2 can be carried out according to the principle of controlled variables, thereby forming a plurality of combined experiments between the two types of variables and providing experimental information support for the subsequent development of an empirical formula between the specified pipeline and the property of transporting said powder fire extinguishing agent, improving the selection and assembly of an existing transport pipeline, and optimizing the effect of fluidization and injection of said powder fire extinguishing agent. As an addition, said experimental piping device 2 may also be an equivalent piping of said fire truck using a powder fire extinguishing system as a basic prototype for conducting a preliminary technical analysis of said powder fire extinguishing system for various types of fire trucks developed or projected in order to provide a benchmark for design optimization or evaluation at low cost and high reduction.

[0038] Said property of transporting said powder fire extinguishing agent in said conduit may include mass transport, momentum transfer, and energy transfer. Said mass transfer can be configured to determine the throughput of said pipeline with respect to each component of said powder fire extinguishing agent, for example, the mass moved by said two-phase flow of dry powder and nitrogen per unit of time, the deposition rate of said dry powder in said pipeline per unit length, and the rate of change of the gas-solid ratio depending on the length of the specified transportation pipeline; said impulse transmission may be configured to determine the effect of the resistance of said transport pipeline on said powder extinguishing agent; and said power transfer can be configured to detect pressure loss caused by factors such as resistance and discharge diffusion during transport of said powder fire extinguishing agent through said transport pipeline.

[0039] Based on the experiments described above of the specified property of transporting the specified powder fire extinguishing agent in the specified pipeline, researchers can obtain an important indicator of the performance of the specified powder fire extinguishing system, which is the spray rate of the specified spray device, that is, the mass of the specified dry powder sprayed per unit time ( kg / s) to measure the intensity of supply of the specified fire extinguishing agent, under the conditions of a given pipeline direction, pipeline diameter and flow characteristics at the pipeline inlet.

[0040] Said recirculation and transfer device 3 is configured to separate the components of said powder extinguishing agent and transfer the separated powder component to said fluidization and injection device 1. Thus, it can be ensured that said powder fire extinguishing agent will not be dispersed in the experimental site, polluting the environment or causing harm to the health of the personnel responsible for conducting the experiment, during the testing of the specified experimental platform.

[0041] In particular, let's take the above dry powder and nitrogen based fire extinguishing agent as an example. The main components of said dry powder include diammonium hydrogen phosphate, sodium bicarbonate, a small amount of a water-resistant substance derived from magnesium stearate, and talc. These components are non-toxic. Particles of conventional powder fire extinguishing agents are generally relatively large, with an average particle size of 40 to 80 microns, and only a small part is respirable dust; while the particles of ultrafine dry powder are relatively fine, the average particle size is 5 to 20 µm, and most of it is respirable dust. When said powder fire extinguishing agent is sprayed under the action of high pressure nitrogen fluidization, under general conditions, if a small amount of airborne dust is inhaled, no harm is caused to the body; however, if a dust blanket is formed and excess fine particles are inhaled, it is very likely to cause aspiration pneumonia and chemical pneumonia. The routes of entry of dry powder in the case of a dust sheet include: inhalation, ingestion and percutaneous absorption. Relevant health hazards include: irritation of the eyes, mucous membranes and upper respiratory tract by dry powder vapor or mist, and nervous system dysfunction most likely to occur after contact.

[0042] As an addition, said recycling and transfer apparatus 3 also utilizes the feature that said dry powder in said powder extinguishing agent does not chemically react with said gas component during the transportation experiment. Said powder component is recycled and reused based on the separation method, which greatly reduces the cost of said transport experiment.

[0043] In some embodiments of the present invention, said recycling and transfer device 3 includes: a separating unit 31 configured to separate said powder component from a gas component in said powder extinguishing agent; and a dry powder container 32 located below said separation unit 31 and configured to accumulate and store said powder component separated by said separation unit 31.

[0044] Said separation unit 31 can sort and separate said powder component in said powder fire extinguishing agent according to the physical properties of said powder component that are different from said gas component, for example, said powder component has properties such as a certain volume and a higher density than specified gas component. Of course, in the case of said powder fire extinguishing agent with dry powder coarse particles, dry powder fine particles and gas as components, said separation unit 31 can also sort and separate different physical properties of said components in the same physical state at the same time.

[0045] In particular, when said powder fire extinguishing agent is a two-phase fire extinguishing agent consisting of a solid and a gas, said separation unit 31 can sort said solid components according to the physical properties of said solid components, distinct from said gas component, for example, having a certain volume and high density. When said multi-phase extinguishing agent is a three-phase extinguishing agent composed of coarse dry powder, fine dry powder and gas, said separation unit 31 can separate its several components into several stages, for example, first using the density difference between said gas component and said solid components to separate said gas component, and then using the volume difference property between coarse dry powder and fine dry powder to sort and filter them for separation.

[0046] In some embodiments of the present invention, said separation unit 31 comprises: an extinguishing agent inlet configured to introduce said powdered extinguishing agent into said separation unit 31; a gas outlet configured to withdraw said separated gas component from said separation unit 31; and a dry powder outlet located below said gas outlet in the vertical direction and configured to withdraw said separated powder component from said separation unit 31.

[0047] Said powder extinguishing agent does not strictly limit the types of said gas component contained therein. That is, said gas may be nitrogen, carbon dioxide, an inert gas, or other gases that can inhibit the combustion reaction. Of course, said dry powder is not limited to ammonium phosphate, sodium bicarbonate, hard magnesium fatty acid or talc powder and the like, but can also be adaptively selected depending on the type of combustion reaction in the combustion section.

[0048] On this basis, said separation unit 31 may use the difference in density or specific shape between said gas component and powder component to separate them. At the same time, said dry powder outlet on said separation unit 31 may be located below said gas outlet, and due to the distance between said gas outlet and dry powder outlet in the vertical direction, said powder component will most likely not be able to spill out of a higher gas outlet, thereby improving the separation efficiency of said separation unit 31.

[0049] In some embodiments of the present invention, said separation unit 31 comprises: a cyclone separator 33 configured to separate said components of said powder fire extinguishing agent according to the magnitude of the centrifugal force through a rotational effect; and a bag-type dust collector 34 configured to separate said components of said powder fire extinguishing agent according to volume based on filtration principles.

[0050] This cyclone separator 33, which is also known as a cyclone type dust collector, is a mechanical dust removal device. Its dust removal mechanism is that the dust-laden air flow rotates, dust particles are separated from said air flow and caught on the wall of said cyclone-type dust collector by centrifugal force, and said dust particles fall into the dust bin by gravity. . Said cyclone separator 33 has the advantages of simple structure and small volume without special auxiliary device, low cost, moderate resistance, no moving parts inside said dust collector, and convenient operation and maintenance.

[0051] This bag-type dust collector 34 is a dry filter device, and its operation principle is to trap dust in dust-laden combustion gases with a bag-type filter block made of fibrous cloth based on filtration principles. When said dust-laden gas enters said bag-type filter, dust containing large particles and having a high specific gravity settles down by gravity and falls into said dust bin. When said gas containing fine dust passes through the filter material, the dust is retained. The layer of dust sediment accumulated on the surface of the filter bag is torn off from the surface of said filter bag and falls into said dust bin by mechanical vibration or air blowback.

[0052] Of course, said separation unit 31 can also select a separation device that performs gas-solid separation based on other principles, such as an inertial dust collector, a gravity dust collector, or a combination of said cyclone separator 33, an inertial dust collector, and a bag-type dust collector 34 described above.

[0053] This inertial dust collector is also known as an inertial dust collector, which is a dust removal device in which dust-laden gas collides with a baffle or abruptly changes the direction of the air flow, separates and collects dust by inertial force. Since said dust particles and gas in the moving air flow have different inertial forces, when said dust-laden gas suddenly turns or collides with an obstacle, the motion path of said dust particles is separated from the motion path of said gas, thereby purifying said gas.

[0054] The specified inertial dust collector type is divided into impact and rotary. The first of these is implemented by installing one or more baffles along the direction of the air flow. The dust-laden gas collides with said baffle so as to separate the dust particles from the gas. It is obvious that the higher the gas velocity before the collision with the specified partition, the lower it will be after the collision. Thus, the less dust is transferred, the higher the dust removal efficiency. The last of the two types is realized by changing the direction of said dust-laden gas several times to separate the dust during the turn. At the same time, the smaller the radius of curvature of the gas turn and the higher the turn speed, the higher the dust removal efficiency.

[0055] In some embodiments of the present invention, said separation unit 31 comprises: a primary separation device provided with a first extinguishing agent inlet 331, a first gas outlet 332, and a first dry powder outlet 333; and a secondary separation device provided with a second inlet 341 for extinguishing agent, a second outlet 342 for gas, and a second outlet 343 for dry powder; wherein said second extinguishing agent inlet 341 is in communication with said first gas outlet 332 such that said secondary separation device performs secondary separation of said gas component separated by said primary separation device.

[0056] For those skilled in the art, based on the two-stage separation device in series ratio as described above, it is possible to perform multi-stage series connection based on the two-stage series connection so as to further enhance the gas-solid separation effect. In the case of multi-phase fire extinguishing agents, such as a fire extinguishing agent consisting of coarse dry powder, fine dry powder and nitrogen, they can be connected in series, according to the separating capacity of said separation device for said dry powder particles. For example, this can be done by first separating the large particles of the dry powder, then separating the fine particles of the dry powder, and finally removing the dust from the gas component to sequentially separate said three components so as to achieve systematic recycling. In order to ensure the purity of said separated gas component, said experimental platform may be tightly sealed. At the same time, said hermetic experimental platform can further prevent leakage of said powder fire extinguishing agent into the environment during the experiment.

[0057] In some embodiments of the present invention, said primary separation device includes: a cyclone separator 33 configured to separate a powder component with a particle diameter greater than a first predetermined diameter from said powder extinguishing agent; said secondary separation device includes: a bag filter 34 configured to further separate a powder component with a particle diameter larger than a second predetermined diameter based on separation of said cyclone separator 33.

[0058] For example, the value range of said first predetermined diameter is 5 to 15 microns, and the value range of said second predetermined diameter is greater than 0.4 microns.

[0059] Said cyclone separator as the primary dust pre-removal device in the present specification has the advantages of simple structure and small volume without special auxiliary apparatus, low cost, moderate resistance, no moving parts inside said dust collector, and convenient operation and maintenance, and is mainly designed to capture particles with a size of 5 to 15 μm, with a dust removal efficiency that can reach more than 90%. As a secondary separation device, said bag-type filter 34 is mainly configured to capture particles larger than 0.4 µm. This bag-type filter 34, which is not sensitive to the properties of dust and is not affected by the composition, concentration, and the like of dust, has high dust removal efficiency and stable exhaust. When said dry powder-nitrogen based fire extinguishing agent enters said bag-type filter 34, the dust content of said gas is greatly reduced, so that the gas-to-solid ratio is increased. Therefore, said bag-type filter can be provided with a smaller size, and its dust removal efficiency can reach more than 99%.

[0060] In some embodiments of the present invention, said experimental platform further includes: a pipeline pressure control device 21 located downstream of said pipeline experimental device, said pipeline pressure control device 21 having a first ball valve 211 for adjusting the pressure of said powder extinguishing agent flowing through said first ball valve 211.

[0061] Said pipeline pressure control device 21 is configured to simulate the load of said spray device at the outlet of said experimental pipeline device 2, so that the experimental conditions of said experimental pipeline system are close to the operating scenario of a real fire extinguishing device.

[0062] In particular, when said powder component of said powder fire extinguishing agent enters a multi-phase flow state after fluidization treatment, it can be roughly considered as a fluid. Therefore, according to the principle of conservation of mass, when the diameter of said pipeline increases, the velocity of said multi-phase flow in said pipeline decreases and the pressure increases; accordingly, as the diameter of said conduit decreases, the velocity of said multi-phase flow in said conduit increases and the pressure decreases.

[0063] Based on this, the specified pipeline pressure control device 21 can control the pressure of the specified powder fire extinguishing agent contained therein by reducing the diameter of the specified pipeline, and then control the opening of the specified first ball valve 211, so that the sum of the pressure losses of the flow passing through the device 4 treatments before recirculation and beyond, equivalent to loading when the pressure of the atomizer is set. Thus, during the experiment, the load at the outlet of said experimental pipeline device 2 is calibrated by first selecting the diameter of said pipeline pressure control device 21 and adjusting the opening of said first ball valve 211, and then performing tests aimed at the parameters of said experimental pipeline or powder inlet. extinguishing agent so that the load state of said spray device can be simulated under actual fire fighting conditions.

[0064] In some embodiments of the present invention, in order to realize the fluidization of said powder component in said powder fire extinguishing agent, said fluidization and injection device 1 includes: a fluidization vessel 11 having an inlet for the powder component, an inlet for component and outlet for powder extinguishing agent and made with the possibility of fluidization of the specified powder component; and a high pressure gas source 12 connected to said gas component inlet through a second ball valve 13 and configured to control the gas component inlet pressure.

[0065] In some embodiments of the present invention, said recycling and transfer device 3 includes: a screw conveyor 35 driven by an electric motor and configured to convey a powder component from said dry powder container 32 to said powder component inlet of said container 11 for fluidization; and an electrical control unit 36 configured to control the conveying speed of said screw conveyor 35 with said motor.

[0066] This screw conveyor 35, which is a mechanical device for transporting by changing the potential energy, can be configured to transport powder, granular and fine bulk materials. Said screw conveyor 35 has a rotating shaft provided with spiral blades so that material can be advanced and conveyed by the rotation of said spiral blades. Compared with other conveying devices, this screw conveyor 35 has the advantages of small overall cross-sectional size, favorable sealing performance, stable and reliable operation, safe operation and convenient maintenance.

[0067] In accordance with the properties of the material to be conveyed and the requirements for the conveying volume, said recycling and transfer device 3 can select a screw conveyor having a large angle of elevation and provided with a shaft so as to smoothly convey said dry powder in said dry powder container 32 in the specified capacity 11 for fluidization. Of course, said screw conveyor 35 may use single-stage conveying or multi-stage combination, according to the actual composition and arrangement of the dust removal system.

[0068] As an addition, said recycling and transfer device 3 can also be replaced by a tubular chain conveyor. This tubular chain conveyor, which is a conveying volumetric dispenser and can convey and dispense material, has the advantages of compact structure and small footprint. Said tubular chain conveyor can create a horizontal, inclined and vertical combined conveying method, according to actual needs, so as to more adaptively change the conveying direction.

[0069] In some embodiments of the present invention, in order to achieve a better fluidization effect, said powder component inlet in said fluidization vessel 11 is located above said gas component inlet in the vertical direction, and said screw conveyor 35 can raise the level of said powder component and pour said powder component into said powder component inlet of said fluidization container 11 from top to bottom in a vertical direction.

[0070] As shown in FIG. 1, said inlets for a powder component and a gas component in said fluidization vessel 11 are located respectively at the upper and lower ends of said fluidization vessel 11, and said powder component and gas component are fluidized within said fluidization vessel 11 by uniform mixing.

[0071] In some embodiments of the present invention, a third ball valve 37 is provided between said screw conveyor 35 and said dry powder container 32 to control the transfer of the powder component from said dry powder container 32 to said screw conveyor 35.

[0072] In some embodiments of the present invention, said experimental platform further comprises a control and detection system 4 that includes: a first weighing device 41 configured to weigh said dry powder container 32; a second weighing device 42 configured to weigh said fluidization container 11; a pressure measuring device 43 configured to measure the outlet pressure of said experimental pipeline device 2; a speed measurement device 44 configured to measure the speed at the input of said recycling and transmission device 3; and a data collection device 45 communicatively connected to said first weighing device 41, second weighing device 42, pressure measuring device 43, and speed measuring device 44, and capable of collecting weight data of said dry powder container 32, weight data of said fluidization tank 11, outlet pressure data of said experimental piping device 2 and inlet velocity data of said recirculation and transfer device 3 and display on the display the indicated weight of said dry powder container 32, the weight of said fluidization container 11, and also the pressure at the outlet of said experimental piping device 2 and the velocity at the inlet of said device 3 for recirculation and transmission.

[0073] Said first weighing apparatus 41 and said second weighing apparatus 42 are respectively provided with weighing sensors mounted at four points on the support of said dry powder container 32 and said fluidizing container 11 so as to determine the weight of said dry powder container 32 and said capacity 11 for fluidization in real time. With said weighing sensors as said first weigher 41 and second weigher 42, the weight signal can be input to said data acquisition device 45 in real time during the conveying experiment of said powder extinguishing agent, so that it is possible to accurately measure the operating speed. spraying said dry powder and the rate of deposition of said dry powder in said conveying conduit based on the results of measuring the mass change of said fluidization vessel 11 and said dry powder container 32.

[0074] In addition, said first weighing device 41 directly measures the load change of said dry powder container 32. Compared to measuring the change in load of said fluidization tank 11, it is more likely to accurately determine the speed of atomization and transport of said dry powder in principle, since there is always a deposition of said dry powder in said pipeline during the process of spraying dry powder from said pipeline from said containers 11 for fluidization.

[0075] Based on the introduction of detection results of said pressure measuring device 43 and speed measuring device 44, and the setting function of said pipeline pressure control device 21 on said experimental platform, said experimental pipeline device 2 is proposed to simulate the loading operating state of said dry powder atomizer . Said data acquisition system is configured to collect measurement results of said pressure measuring device 43 and velocity measuring device 44 in order to calibrate and adjust said pipeline pressure regulating device 21; and also configured to collect measurement signals of said first weighing device 41 and second weighing device 42 to determine the operating speed of spraying said dry powder in real time.

[0076] In some embodiments of the present invention, said first ball valve 211 in said pipeline pressure control device 21, said second ball valve 13 in said fluidization and injection device 1, and said third ball valve 37 in said recirculation and transfer device 3 can use an electrically operated ball valve. On this basis, said control and detection system 4 also includes: a control device that is communicatively connected to said data acquisition device 45 and configured to control the rotation speed of said electric motor and control the opening degree of said first ball valve 211, second ball valve 13 and the third ball valve 37, in accordance with a predetermined program based on the weight of said dry powder container 32, the weight of said fluidization vessel 11, the outlet pressure of said experimental pipeline device 2, and the inlet velocity of said recirculation and transfer device 3 .

[0077] In some embodiments of the present invention, said excessively high energy powder fire extinguishing agent enters said recycling and transfer device 3 directly, which may affect the separation effect of said recycling and transfer device 3. On this basis, said experimental platform may also include a pre-recycling treatment device configured to adjust the state of said powder fire extinguishing agent entering said recycling and transfer device 3 so as to meet the requirements at the inlet of said recycling and transfer device 3.

[0078] Said requirements at the inlet of said recycling and transfer device 3 may include pressure requirements, velocity requirements, solids particle size requirements, and the like. Taking particle size requirements as an example, when solid components with an excessively large particle size enter said device 3 for recycling and transfer at a certain speed, sharp edges formed as a result of agglomeration of said solid components may cause damage to relatively fragile structures in said device. 3 for recycling and transfer, so that it is necessary to perform crushing processing in said processing device before recycling.

[0079] In some embodiments of the invention, said pre-recirculation treatment device may also include a rate control conduit located at the inlet of said recirculation and transfer device 3 and having a larger diameter conduit than said outlet of said fluidizing and injection device 1 , which is configured to control the speed of the specified powder fire extinguishing agent pumped through the specified pipeline to control the speed.

[0080] Said rate control pipeline can improve the condition of said dry powder when entering said recycling and transfer device 3 . For example, when said primary separation device in said separation unit 31 of said recycling and transfer device 3 selects a cyclone separator 33, said rate control pipeline can control the inlet rate of said powder fire extinguishing agent entering said cyclone separator 33 within the optimum operating range. from 10 to 20 m/s.

[0081] The technical solution proposed by the present invention will be described in more detail below with reference to FIG. one.

[0082] FIG. 1 illustrates a schematic representation of the construction of said experimental platform for transporting powder fire extinguishing agent, which is proposed by the present invention. In this accompanying drawing, said platform is divided into a left and right body, in which said left body inside contains a fluidization tank 11 and a high pressure nitrogen source for preparing a fire extinguishing agent based on dry powder and nitrogen, while said right body inside contains a separation device, container 32 for dry powder and screw machine for transportation. Said separation device, according to the drawing, includes two-stage separation processes located side by side on the top of said dry powder container 32, wherein said cyclonic separator 33 serves as the first stage and said bag filter 34 serves as as a second step. Said screw conveying machine, as shown in the drawing, is configured to transport said dry powder from said dry powder container 32 to said fluidizing container 11 . On the basis of the above-described elements located in said two bodies, which differ from each other in function, it is possible to facilitate the operations of transporting and separating said experimental platform.

[0083] Based on the solution of the problem of dry powder recycling, the powder fire extinguishing agent transport experimental platform of the present invention can simulate the dry powder transport system of a fire engine with equal dimensions, determine the dry powder spray transport speed, flow rate and pressure, and transport properties of the flow in two phases of gas and solid within said pipeline, and perform function calculation and design optimization of said dry powder transport system of conventional powder fire engines or lifting fire engines.

[0084] Said recirculation and transfer apparatus 3 of the present invention implements the addition by combining said cyclone separator 33 and bag type filter 34 to realize a large recirculation ratio of a conventional dry powder and an ultra-fine dry powder (a recirculation ratio of more than 90%), so that the exhaust gases of the specified experimental platform meet the requirements of environmental protection and guarantee the health of the personnel responsible for the tests.

[0085] Said dry powder container 32 of the present invention can simultaneously hold the separated materials of said cyclone separator 33 and bag-type filter 34, and convey the reconstituted dry powder to said fluidization container 11 through a screw lifter, so that said apparatus 3 for recycling and transmission has the advantages of compact overall structure, simple recycling and return path, low cost and reliable operation.

[0086] Said first weighing device 41 and second weighing device 42 provided by the present invention can directly measure the load changes of said dry powder container 32 and said fluidizing container 11, which not only enables accurate determination of the spraying and conveying speed of dry powder in principle , but also compares and analyzes the conditions for changing the deposition of dry powder transported through the specified pipeline during spraying and transportation. Embodiments of the present invention have been described in detail in conjunction with the above embodiments. However, the present invention is not limited to the described embodiments.

[0087] Thus, based on the above technical solution, these embodiments of the present invention can achieve at least one of the following beneficial technical effects:

[0088] On the basis of solving the problem of dry powder recycling, said powder fire extinguishing agent transport experimental platform of the present invention can simulate said dry powder transport system of a fire engine with equal dimensions, determine the sprayed dry powder transport speed, flow rate, and pressure, and also transport properties of the flow in two phases of gas and solid within said pipeline, and perform function calculation and design optimization of said dry powder transport system of conventional powder fire engines or lifting fire engines.

[0089] Said recirculation and transmission apparatus of the present invention implements the addition by combining said cyclone separator and bag type filter to realize a large recirculation ratio of a conventional dry powder and an ultra-fine dry powder (a recirculation ratio of more than 90%), so that the exhaust gases of the specified experimental platform meet the requirements of environmental protection and guarantee the health of the personnel responsible for testing.

[0090] Said dry powder container of the present invention can simultaneously accommodate the separated materials of said cyclone separator and bag type filter, and convey the reconstituted dry powder to said fluidization vessel through a screw hoist, so that said recycling and transfer device has advantages compact overall structure, simple recycling and return path, low cost and reliable performance.

[0091] Said first weighing device and second weighing device provided by the present invention can directly measure load changes of said dry powder container and said fluidizing container, which not only accurately determines the speed of spraying and transporting dry powder in principle, but also compares and analyzes the conditions for changing the deposition of dry powder transported through said pipeline during spraying and transportation.

[0092] Finally, it should be noted that: the above embodiments of the present invention are only intended to explain the said technical solution of the present invention, but do not limit it; although detailed explanations of the present invention are given with reference to the preferred embodiments of the present invention, those skilled in the art should understand that: it is still possible to make changes to said embodiments of the present invention or equivalent replacements for certain technical features, which should all be included in the scope of said technical solution for which protection is claimed in the present description, without departing from the essence of said technical solution of the present invention.

Claims (37)

1. Experimental platform for transportation of dry powder fire extinguishing agent, containing: a device (1) for fluidization and injection, configured to generate a dry powder fire extinguishing agent for spraying, and the device (1) for fluidization and injection contains: a tank (11) for fluidization, having an inlet for a dry powder component, an inlet for a gas component and outlet for dry powder fire extinguishing agent and made with the possibility of fluidization of the specified dry powder component; experimental piping device (2) located at the outlet of the device (1) for fluidization and injection and having a detachable connection for the pipeline, made with the possibility of attaching the transport pipeline to be tested; and device (3) for recirculation and transfer, located at the outlet of the experimental pipeline device (2) in order to collect the specified dry powder fire extinguishing agent, separate the components of the specified dry powder fire extinguishing agent from each other and transfer the separated dry powder component to the specified device (1) for fluidization and injection; moreover, the specified device (3) for recycling and transmission includes: a separation unit (31) configured to separate the dry powder component from the gas component in said dry powder extinguishing agent; and a dry powder container (32) located below the separation unit (31) and configured to collect and store said dry powder component separated by the separation unit (31); a screw conveyor (35) driven by a motor and configured to transport said dry powder component from said dry powder container (32) to the powder component inlet of said fluidizing container (11); and electrical control unit (36) configured to control operation and transport speed of said screw conveyor (35) using said electric motor. 2. The experimental platform according to claim 1, in which the specified separation unit (31) contains: an inlet (331, 341) for a fire extinguishing agent configured to introduce said dry powder fire extinguishing agent into said separation unit (31); outlet (332, 342) for gas, made with the possibility of removing the specified separated gas component from the specified separation unit (31); and outlet (333, 343) for dry powder located below said outlets for gas in the vertical direction and made with the possibility of removing said separated dry powder component from said separation unit (31). 3. Experimental platform according to claim 2, in which the specified separation unit (31) contains: a cyclone separator (33) configured to separate said components of said dry powder fire extinguishing agent according to the magnitude of the centrifugal force by means of a rotational effect; and a bag-type dust collector (34) configured to separate said components of said dry powder fire extinguishing agent according to volume based on filtration principles. 4. Experimental platform according to claim 2, in which the specified separation unit (31) contains: a primary separation device provided with a first inlet (331) for fire extinguishing agent, a first outlet (332) for gas and a first outlet (333) for dry powder; and a secondary separation device provided with a second inlet (341) for fire extinguishing agent, a second outlet (342) for gas and a second outlet (343) for dry powder; wherein the second inlet (341) for fire extinguishing agent is in communication with said first outlet (332) for gas, so that said secondary separation device performs a secondary separation of said gas component separated by said primary separation device. 5. Experimental platform according to claim 4, in which the specified primary separation device contains: a cyclone separator (33) configured to separate dry powder components with a particle diameter greater than the first predetermined diameter from said dry powder extinguishing agent; said secondary separation device comprises: a bag filter (34) configured to further separate a dry powder component with a particle diameter greater than a second predetermined diameter based on separation of said cyclone separator (33); wherein the range of values of said first predetermined diameter is from 5 to 15 microns, and the range of values of said second predetermined diameter is greater than 0.4 microns. 6. Experimental platform according to claim 1, additionally containing: a pipeline pressure control device (21) located at the outlet of said experimental pipeline device, wherein said pipeline pressure control device has a first ball valve (211) configured to control the pressure of said dry powder fire extinguishing agent flowing through said first ball valve ( 211). 7. The experimental platform according to claim 6, in which the specified device (1) for fluidization and injection further comprises: a high pressure gas source (12) connected to said gas component inlet through a second ball valve (13) and configured to control the pressure at the gas component inlet. 8. The experimental platform according to claim 1, in which the specified inlet for the dry powder component in the specified container (11) for fluidization is located above the specified inlet for the gas component in the vertical direction, and the specified screw conveyor (35) is configured to raise the height level of the specified dry powder component and pouring said dry powder component into said dry powder inlet of said container (11) for fluidization from top to bottom in the vertical direction. 9. Experimental platform according to claim 1, wherein a third ball valve (37) is provided between said screw conveyor (35) and said dry powder container (32) in order to control the transfer of the dry powder component from said container (32) to dry powder on the specified screw conveyor (35). 10. Experimental platform according to claim 9, additionally containing a control and detection system (4), in which the specified (4) control and detection system contains: a first weighing device (41) capable of weighing said dry powder container (32); a second weighing device (42) configured to weigh said fluidization container (11); a pressure measurement device (43) configured to measure the pressure at the outlet of said pilot pipeline device (2); a device (44) for measuring speed, configured to measure the speed at the input of said device (3) for recirculation and transmission; and a data collection device (45) connected with the possibility of communication with the specified first weighing device (41), the second weighing device (42), the pressure measuring device (43) and the speed measuring device (44) and configured to collect data on the weight of the indicated container (32) for dry powder, weight data of said fluidization vessel (11), outlet pressure data of said experimental piping device (2), and inlet velocity data of said recirculation and transmission device (3) and display the specified weight of the specified container (32) for dry powder, the weight of the specified container (11) for fluidization, the outlet pressure of the specified experimental pipeline device (2) and the velocity at the inlet of the specified device (3) for recirculation and transfer. 11. The experimental platform according to claim 10, in which the specified (4) control and detection system further comprises: a control device connected for communication with said data acquisition device (45) and configured to control the rotation speed of said electric motor and control the degree of opening of said first ball valve (211), second ball valve (13) and third ball valve (37), in accordance with a given program based on the specified weight of the specified container (32) for dry powder, the weight of the specified container (11) for fluidization, the outlet pressure of the specified experimental pipeline device (2) and the velocity at the inlet of the specified device (3) for recirculation and transfer .

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