CN115962622A - Cooling protection system suitable for LNG storage tank shock attenuation facility - Google Patents

Abstract

The invention relates to a cooling protection system suitable for an LNG storage tank damping facility, which comprises: the water inlet of the deluge valve group is communicated with a water source, and the signal input end of the deluge valve group is connected with the signal output end of a fire gas system; the water inlet of the water supply device is communicated with the first water outlet of the deluge valve group, the water supply device comprises a plurality of water mist spray heads, and the water mist spray heads are used for spraying water to the shock insulation pad; foam storage device, foam storage device's water inlet with the second delivery port intercommunication of valve group drenches, foam storage device's liquid outlet with water supply installation's inlet is connected, foam storage device's signal input part and fire gas system's signal output part are connected. The system can meet the requirement of long-time fire prevention, can reduce the consumption of fire water, improves the safety and stability of the LNG storage tank damping system, and reduces the failure problem of the damping device caused by long-time fire.

Description

A Cooling Protection System Applicable to LNG Storage Tank Shock Absorbing Facilities

technical field

The invention relates to a cooling protection system suitable for shock absorbing facilities of LNG storage tanks, and belongs to the technical field of fire protection of LNG receiving stations.

Background technique

In order to ensure that the LNG storage tank can meet the seismic load requirements and reduce the shaking or even rupture of the LNG storage tank caused by environmental factors, the seismic design of the LNG concrete full-contained tank often adopts a shock-absorbing and isolation system to reduce the risk, especially after 2021. The practice has been widely promoted. However, vibration isolation pads and cushioning components are mainly made of rubber, which cannot be fire-resistant for a long time due to the fire resistance of the material itself and the requirements for cushioning deformation.

Research has shown that the current LNG storage tank shock-proof pads mainly adopt the fire-resistant method of the material itself, and the fire-resistant effect is achieved through the proportion of materials. However, the fire-resistant limit of most of the shock-isolation pad rubber is less than 90 minutes. According to the requirements of national regulations , the fire resistance limit of the first-level components is not less than 3 hours, so the current shock absorption and isolation system is difficult to meet the fire resistance limit requirements of the storage tank.

Conventional water spray systems require cumbersome control logic, including deluge valves, front and rear control valves, and various internal valves and pipelines required by the deluge valve itself, and need to be equipped with water mist nozzles to achieve fire protection or cooling purposes, but LNG The number of storage tank piles exceeds 400, that is, more than 400 seismic isolation pads are required, which consumes a huge amount of water, which seriously affects the conventional fire protection design and the overall fire stability of the station.

Contents of the invention

In view of the above technical problems, the present invention provides a cooling protection system suitable for LNG storage tank shock absorption facilities, which can not only meet the long-term fire prevention requirements, but also reduce the consumption of fire fighting water, and improve the safety of the LNG storage tank shock absorption system Stability, reducing the failure of shock absorbers caused by long-term fires.

To achieve the above object, the present invention takes the following technical solutions:

A cooling protection system suitable for shock absorbing facilities of LNG storage tanks, comprising the following components:

The deluge valve group, the water inlet of the deluge valve group is used to communicate with the water source, and the signal input end of the deluge valve group is used to connect with the signal output end of the fire and gas system;

A water supply device, the water inlet of the water supply device communicates with the first water outlet of the deluge valve group, the water supply device includes several water mist nozzles, and several of the water mist nozzles are used to spray water to the shock-absorbing pad;

A foam storage device, the water inlet of the foam storage device communicates with the second water outlet of the deluge valve group, the liquid outlet of the foam storage device is connected with the liquid inlet of the water supply device, and the foam storage device The signal input end of the device is used to connect with the signal output end of the fire and gas system.

In the cooling protection system applicable to LNG storage tank shock absorption facilities, preferably, the foam storage device includes a foam stock solution tank and a mixer, and the liquid outlet of the foam stock solution tank is connected to the liquid inlet of the mixer The water inlet of the mixer is connected with the second water outlet of the deluge valve group, and the liquid outlet of the mixer is connected with the liquid inlet of the water supply device.

In the cooling protection system applicable to LNG storage tank shock absorbing facilities, preferably, the water supply device is a circular water supply pipeline, and several nozzles are evenly arranged along the circumference of the circular water supply pipeline.

In the cooling and protection system suitable for shock absorbing facilities of LNG storage tanks, preferably, the annular water supply pipeline is welded in series by several individual water supply pipelines.

In the cooling and protection system suitable for shock absorbing facilities of LNG storage tanks, preferably, the two ends of the single water supply pipeline are provided with connecting devices for connecting with the adjacent single water supply pipeline.

The cooling protection system applicable to LNG storage tank shock absorption facilities, preferably, the cooling protection system also includes several water supply pipeline support devices for supporting the nozzles, and the water supply pipeline support devices are connected to the The nozzles are set in one-to-one correspondence.

In the cooling protection system applicable to LNG storage tank shock absorbing facilities, preferably, the water supply pipeline support device includes a support device base and a telescopic adjustment part assembled on the support device base, and the telescopic adjustment part and The sprinkler head is connected.

In the cooling and protection system suitable for shock absorption facilities of LNG storage tanks, preferably, the telescopic adjustment component is a fireproof painted telescopic steel pipe.

In the cooling protection system applicable to LNG storage tank shock absorption facilities, preferably, the cooling protection system further includes a water pressure alarm bell, and the water pressure alarm bell is communicatively connected with the deluge valve group.

In the cooling and protection system applicable to shock absorbing facilities of LNG storage tanks, preferably, the fire-fighting water source includes a first water supply pipeline and a second water supply pipeline for supplying water to the deluge valve group.

The present invention has the following advantages due to the adoption of the above technical scheme:

1. The present invention effectively reduces the supply of fire-fighting water through the design of the large ring network (circular water supply pipeline), fixed system parameters and dual-way water supply, without increasing the original fire-fighting design load. On the basis of ensuring safety, it can reduce The small impact on the fire protection system provides a positive reference for the safety and feasibility of the subsequent LNG storage tank construction. The water cooling plus foam auxiliary cooling proposed by the present invention can provide a certain technical reference for the LNG receiving station, and improve the overall fire protection safety performance of the LNG receiving station.

2. The water cooling protection system suitable for LNG storage tank shock absorption facilities provided by the present invention makes up for the lack of fire resistance of the current LNG storage tank shock absorption and isolation system. Through the new cooling protection device, the LNG storage tank isolation can be extended. The fire resistance limit time of the shock system is at least 3 hours to ensure that the LNG storage tank will not tilt or rupture due to the deviation of the foundation when a fire occurs. Through the water mist nozzle, a new mode based on water cooling and foam mixture as an auxiliary is achieved. , effectively improving the intrinsic safety of LNG storage tanks under fire conditions.

Description of drawings

Fig. 1 is a flowchart of a cooling protection system provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the layout of the annular water supply pipeline provided by this embodiment of the present invention;

Figure 3 is a schematic diagram of a single water supply pipeline provided by this embodiment of the present invention;

Fig. 4 is a schematic diagram of the water supply pipeline support system provided by this embodiment of the present invention;

Figure 5 is a schematic diagram of the foam storage device provided by this embodiment of the present invention;

The marks in the figure are as follows:

1-First water supply pipeline; 2-Second water supply pipeline; 3-Deluge valve group; 4-Foam storage device; 5-Circular water supply pipeline; 6-Water mist nozzle; 7-Fire and gas system; 8- Water pressure alarm bell; 9-shock isolation pad; 10-single water supply pipeline; 11-connection device; 12-water supply pipeline support device; 13-telescopic adjustment parts; 14-support device base; 15-mixer; Foam stock solution tank; 17-liquid outlet.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are clearly and completely described below. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without making creative efforts belong to the protection scope of the present invention.

Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second", "third", "fourth" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Aiming at the existing problems and fire prevention requirements of the current LNG storage tank shock absorption and isolation system, the present invention proposes a new type of cooling and protection system suitable for LNG storage tank shock absorption facilities to solve the problem of long-term cooling and fire protection of shock isolation pads and reduce the cost of fire protection. Fire system load and other issues.

As shown in Figure 1, the cooling protection system involved in the present invention includes a deluge valve group 3, a foam storage device 4, an annular water supply pipeline 5 and a water mist nozzle 6; the deluge valve group 3 passes through two pipelines ( The first water supply pipeline 1 and the second water supply pipeline 2) are connected with the local stable fire-fighting water source, and the signal input end of the deluge valve group 3 is connected with the signal output end of the fire and gas system 7; The first water outlet of the shower valve group 3 is connected, and several water mist nozzles 6 are evenly arranged on the circular water supply pipeline 5, and several water mist nozzles 6 are used to spray water to the shock-absorbing pad 9; the water inlet of the foam storage device 4 is connected to the The second water outlet of the deluge valve group 3 is connected, the liquid outlet of the foam storage device 4 is connected to the liquid inlet of the circular water supply pipeline 5, and the signal input end of the foam storage device 4 is connected to the signal output end of the fire and gas system 7 .

Further, the cooling protection system also includes a water pressure alarm bell 8, and the water pressure alarm bell 8 is communicatively connected with the deluge valve group 3. The deluge valve group 3 adopts the diaphragm form (it is a conventional deluge valve form, mainly refers to the opening and closing of the valve clack by diaphragm movement, and the diaphragm divides the deluge valve into a pressure chamber and a working chamber. , to achieve a sealed state, it is a mature product), the size selection is consistent with the size of the main pipe, the deluge valve group 3 adopts the principle of two-way water supply (that is, two ways are separated from the fire-fighting water source: the first water supply line 1 and the second water supply line Road 2 supplies water to deluge valve group 3).

As shown in FIG. 2 , the circular water supply pipeline 5 is a circular pipeline, and the water mist nozzles 6 are evenly arranged along the circumferential direction of the circular pipeline.

In some specific embodiments of the present invention, the annular water supply pipeline 5 may be an integral annular pipeline, or may be formed by welding several individual water supply pipelines 10 in series, as shown in FIG. 3 . More preferably, the two ends of a single water supply pipeline 10 are provided with a connecting device 11 (the connecting device 11 is in the form of a threaded button, which can be tightened by connecting the pipes and has threads), for connecting with the adjacent single water supply pipeline. Pipeline 10 is connected.

As shown in Figure 3, the circumferential water supply pipeline 5 is an assembled type. Considering that the diameter of a conventional storage tank is 90-100m, the arc length of a single water supply pipeline 10 is 2m. After assembly, it is fixed by welding. The diameter of 5 is determined by the following formula:

In the formula, Q is the total fire water consumption, v is the fire water flow rate of the pipeline, where Q can be determined by the total flow of water mist nozzles, and the circular water supply pipeline 5 adopts the principle of two-way water supply.

As shown in Figure 4, the cooling protection system also includes a number of water supply pipeline support devices 12 for supporting the spray head, specifically, the water supply pipeline support device 12 includes a support device base 14 and a telescopic The adjusting part 13 is connected with the aerosol spray head 6 by the telescopic adjusting part 13 . In some specific examples, the telescopic adjustment parts 13 are fire-proof painted telescopic steel pipes, one set every 10m, and the water supply pipeline support device 12 and the support device base 14 are both made of metal plates.

As shown in Figure 5, the foam storage device 4 includes a foam stock solution tank 16 and a mixer 15, the liquid outlet of the foam stock solution tank 16 is connected to the liquid inlet of the mixer 15, and the water inlet of the mixer 15 is connected to the deluge valve group 3 The second water outlet is connected, and the liquid outlet of the mixer 15 is connected with the liquid inlet of the annular water supply pipeline 5 . A liquid discharge port 17 is also arranged on the foam stock solution tank 16 .

In a specific example, the mixing ratio of the foam output by the foam stock solution tank 16 and the water output by the deluge valve group 3 is 3%, and the hydraulic propulsion in the deluge valve group 3 and the signal of the fire and gas system 7 are used to start, and the ring is automatically injected The water supply pipeline 5 is sprayed out by the water mist nozzle 6.

The K coefficient of the water mist nozzle 6 is 16, the model is ZSTWC16/120, the supply strength is 2.5L/(min m ² ), and the working pressure is 0.35MPa, which can meet the basic needs. The installation height of the water mist nozzle 6 is the highest for the protection target point, the number of nozzles is determined by the following formula:

N=A/q

In the formula, N is the number of nozzles, A is the protection area, and q is the flow rate of the water mist nozzles.

The flow rate of water mist nozzle 6 is determined by the following formula:

In the formula, q is the flow rate of the water mist nozzle, and P is the working pressure of the nozzle.

The cooling protection system disclosed by the invention is automatically controlled, and simultaneously has the functions of remote manual and emergency operation. The system will be connected to the fire and gas system 7 of the LNG storage tank. When the flame detector detects a fire signal, the signal will be transmitted to the fire alarm control panel, and the deluge valve group 3 will be activated through the interlock control signal of the fire and gas system control panel, thereby opening Cooling protection system, the fire water in this system enters the main network in two parts, one is the main water source directly enters the main pipeline, and is transported to the water mist nozzle 6 through the ring water supply pipeline 5, and the other is divided after the deluge valve group 3 All the way to the microfoam mixed liquid storage device (foam storage device 4), it is automatically activated by the fire water flow pressure, and the mixed liquid is sent back to the main pipeline, and sent to the water mist nozzle 6 through the ring water supply pipeline 5. The fire alarm control panel is equipped with a remote manual button for the cooling protection system, which can be manually opened remotely, and the status signal is displayed on the fire alarm control panel.

The specific working process of the cooling protection system is as follows: After the deluge valve group 3 is connected to the local stable fire water source through the first water supply pipeline 1 and the second water supply pipeline 2, the water enters the deluge valve group 3, and the deluge valve group 3 After receiving the signal from the fire and gas system 7, it will start automatically, and the water pressure alarm bell 8 will give an on-site alarm synchronously. The foam storage device 4 is sent to the foam storage device 4 in two ways. The start of the foam storage device 4 also needs to receive a signal from the fire and gas system 7. After the foam storage device 4 is started, the foam is sent to the ring water supply pipeline 5 to form a two-way water supply. All cooling Water will be sprayed to the shock absorption and isolation system to be protected through the water mist nozzle 6, so as to achieve the ultimate purpose of cooling protection.

The present invention effectively reduces the supply of fire-fighting water through the design of a large ring network (circular water supply pipeline 5), fixed system parameters, and dual-way water supply without increasing the original fire-fighting design load. On the basis of ensuring safety, it can reduce The impact on the fire protection system provides a positive reference for the safety and feasibility of the subsequent LNG storage tank construction. The water cooling plus foam auxiliary cooling proposed by the present invention can provide a certain technical reference for the LNG receiving station, and improve the overall fire protection safety performance of the LNG receiving station.

The water cooling protection system suitable for LNG storage tank shock absorption facilities provided by the present invention makes up for the lack of fire resistance of the current LNG storage tank shock absorption and isolation system, and can extend the LNG storage tank shock absorption and isolation system through the new cooling protection device The fire resistance limit time of at least 3 hours ensures that the LNG storage tank will not be tilted or ruptured due to the deviation of the foundation when a fire occurs. Through the water mist nozzle, a new mode based on water cooling and foam mixture as the auxiliary is achieved, which is effective Improve the intrinsic safety of LNG storage tanks under fire conditions.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A cooling protection system suitable for LNG storage tank damping facilities, characterized in that it comprises the following components: The deluge valve group, the water inlet of the deluge valve group is used to communicate with the water source, and the signal input end of the deluge valve group is used to connect with the signal output end of the fire and gas system; A water supply device, the water inlet of the water supply device communicates with the first water outlet of the deluge valve group, the water supply device includes several water mist nozzles, and several of the water mist nozzles are used to spray water to the shock-absorbing pad; A foam storage device, the water inlet of the foam storage device communicates with the second water outlet of the deluge valve group, the liquid outlet of the foam storage device is connected with the liquid inlet of the water supply device, and the foam storage device The signal input end of the device is used to connect with the signal output end of the fire and gas system. 2. The cooling protection system suitable for LNG storage tank shock absorption facilities according to claim 1, wherein the foam storage device includes a foam stock solution tank and a mixer, and the liquid outlet of the foam stock solution tank is connected to the foam stock solution tank. The liquid inlet of the mixer is connected, the water inlet of the mixer is connected with the second water outlet of the deluge valve group, and the liquid outlet of the mixer is connected with the liquid inlet of the water supply device. 3. The cooling protection system suitable for shock absorption facilities of LNG storage tanks according to claim 1, characterized in that, the water supply device is a circular water supply pipeline, and several nozzles are arranged along the circular water supply pipeline. Circumferentially evenly arranged. 4. The cooling protection system suitable for LNG storage tank shock absorbing facilities according to claim 3, wherein the annular water supply pipeline is welded in series by several individual water supply pipelines. 5. The cooling protection system suitable for LNG storage tank shock absorbing facilities according to claim 4, characterized in that, the two ends of the single water supply pipeline are provided with connecting devices for connecting with the adjacent single water supply pipeline road connection. 6. The cooling protection system suitable for LNG storage tank shock absorption facilities according to claim 5, characterized in that, the cooling protection system also includes several water supply pipeline support devices for supporting the nozzles, the water supply The pipeline supporting device is provided in one-to-one correspondence with the spray heads. 7. The cooling protection system suitable for LNG storage tank shock absorbing facilities according to claim 6, characterized in that, the water supply pipeline support device includes a support device base and telescopic adjustment parts assembled on the support device base , the telescoping adjustment component is connected with the spray head. 8 . The cooling protection system suitable for LNG storage tank shock absorbing facilities according to claim 7 , wherein the telescopic adjustment member is a fireproof painted telescopic steel pipe. 9. The cooling protection system suitable for LNG storage tank shock absorption facilities according to claim 1, characterized in that, the cooling protection system also includes a water pressure alarm bell, and the water pressure alarm bell and the deluge valve Group communication connection. 10. The cooling protection system suitable for LNG storage tank shock absorbing facilities according to claim 1, wherein the fire water source includes a first water supply pipeline and a second water supply pipeline for spraying water to the rain Valve group water supply.

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