Flexible fireproof and explosion-proof integrated converter station blocking plate and blocking system

Abstract

The application provides a flexible fireproof and explosion-proof integrated converter station blocking plate, which has both fireproof and explosion-proof performances and can avoid the damage of internal facilities of the valve hall caused by the fire or explosion due to the failure of the converter transformer. The blocking plate comprises: an explosion-proof layer and a fireproof layer which are arranged in layers; the explosion-proof layer is externally provided with a fireproof cladding layer; the explosion-proof layer is an explosion-facing surface, and the fireproof layer is a back explosion surface; the explosion-proof layer is a polyurethane foam layer; and the material of the fireproof layer is fireproof fiber. Preferably, the explosion-proof layer is a multi-stable gradient polyurethane foam layer; in addition, the application provides a blocking system based on the blocking plate.

Description

TECHNICAL FIELD

[0001] The present application relates to a converter station blocking plate, in particular to a flexible and integrated fireproof and explosion-proof ultra-high voltage converter station blocking plate and blocking system, belonging to the field of major infrastructure public safety protection. BACKGROUND

[0002] The ultra-high voltage direct current converter station is the core of the realization of AC / DC conversion of the ultra-high voltage direct current project, is an important clean energy channel of the national air pollution prevention plan, and is an energy "golden card" to the world. However, the operation reliability of the ultra-high voltage direct current converter station directly affects the safety of personnel and equipment and the stable operation of the power grid.

[0003] In recent years, explosion accidents of converter stations have occurred frequently. The insulating oil in the converter transformer oil tank is more than 100 t. Once a fault arc causes a fire or even an explosion accident, the valve hall fireproof blocking system is damaged, the fire spreads to the inside of the valve hall, and a major substation failure may evolve into a series of concurrent failures, which may cause large-scale failures of banking facilities, security systems, manufacturing plants, food refrigeration, communication networks and traffic control systems, causing incalculable economic losses and adverse social impacts.

[0004] At present, the converter transformer and the valve hall in the ultra-high voltage converter station are generally separated by a fireproof blocking system composed of PAROC plates (a kind of light rock wool sandwich plate, 0.5 mm demagnetization stainless steel plate + 150 mm rock wool + 0.6 mm demagnetization stainless steel plate). The fire resistance of the PAROC plate under the ISO 834 standard temperature curve is greater than 3 h, but the real fireproof ability of the fireproof blocking system composed of PAROC plates still has great uncertainty. On the one hand, a large amount of insulating oil is used inside the converter transformer, and its ignition and combustion is close to hydrocarbon fire. Compared with cellulose fire (ISO 834 standard temperature curve), hydrocarbon fire combustion has the characteristics of high temperature rising rate, and can reach 1100℃ in a very short time, which can easily cause rapid performance degradation of the fireproof blocking material. On the other hand, the structure of this fireproof blocking system does not consider the explosion effect. Once an explosion and combustion accident occurs in the converter transformer, the structure of the fireproof blocking system may be directly damaged by the explosion and completely lose the fireproof function, causing the fire to spread to the valve hall. This fireproof blocking system structure does not consider the explosion effect. Once an explosion and combustion accident occurs in the converter transformer, the structure of the fireproof blocking system may be directly damaged by the explosion and completely lose the fireproof function, causing the fire to spread to the valve hall, causing incalculable economic losses.

[0005] For the new problem of potential oil fire and explosion combination of the ultra-high voltage energy system, the existing anti-explosion protection plugging structure cannot meet the requirements. If high-strength steel structure is used for plugging, heat conduction and electromagnetic effect problems will be caused, which is easy to cause eddy current and cause short circuit and fire, so new flexible materials and composite structure forms need to be introduced for the plugging structure of the ultra-high voltage DC converter station. SUMMARY

[0006] Therefore, the present application provides a flexible fireproof and anti-explosion integrated converter station plugging plate, which takes into account the fireproof and anti-explosion performance, and can avoid the destruction of the internal facilities of the valve hall caused by the fire or explosion caused by the failure of the converter transformer.

[0007] The flexible fireproof and anti-explosion integrated converter station plugging plate comprises: an anti-explosion layer and a fireproof layer which are stacked; the anti-explosion layer has a fireproof cladding layer on the outside;

[0008] The anti-explosion layer is the explosion-facing surface, and the fireproof layer is the explosion-backing surface;

[0009] The anti-explosion layer is a polyurethane foam layer; and the material of the fireproof layer is fireproof fiber.

[0010] As a preferred mode of the present application, the anti-explosion layer is a multi-stable gradient polyurethane foam layer;

[0011] The multi-stable gradient polyurethane foam layer comprises a plurality of foam cell module blocks distributed along the thickness direction, each foam cell module block being a single-layer or multi-layer structure; the density of each foam cell module block increases from top to bottom along the thickness direction; and the lower end surface of the multi-stable gradient polyurethane foam layer is connected with the fireproof layer.

[0012] As a preferred mode of the present application, the multi-stable gradient polyurethane foam layer comprises a 3D-printed multi-stable structure skeleton and polyurethane foam filled in the multi-stable structure skeleton.

[0013] As a preferred mode of the present application, the 3D-printed multi-stable structure skeleton is a planar honeycomb structure comprising a plurality of multi-stable cells; each multi-stable cell is filled with polyurethane foam; and the density of the filled polyurethane foam increases from top to bottom along the thickness direction.

[0014] As a preferred mode of the present application, a through hole is arranged on the plugging plate for the valve side bushing of the converter transformer to pass through.

[0015] As a preferred mode of the present application, the plugging plate is of a modular structure and is formed by a plurality of plugging plate cell planes spliced together.

[0016] As a preferred mode of the present application, the plugging plate is a prefabricated part.

[0017] As a preferred mode of the present application, the fireproof layer comprises a plurality of layers of polyurea reinforced glass fiber plates.

[0018] In addition, the application provides a converter station sealing system, which comprises, from outdoor to indoor, a converter station body, a waterproof sleeve A, an outdoor side hole edge, a fireproof wall, a sealing plate, a shielding layer, an indoor side hole edge and a waterproof sleeve B; the sealing plate is the flexible fireproof explosion-resistant integrated converter station sealing plate according to any one of claims 1-8, and the sealing plate is installed on the stainless steel keel of the shielding layer.

[0019] As a preferred mode of the present application, the sealing plate is a modular splicing structure, which comprises six sealing plate cells, namely sealing plate cell A, sealing plate cell B, sealing plate cell C, sealing plate cell D, sealing plate cell E and sealing plate cell F,

[0020] The sealing plate cell A and the sealing plate cell B are spliced horizontally to serve as a first layer of sealing plate module; the sealing plate cell C and the sealing plate cell D are spliced horizontally to serve as a second layer of sealing plate module; and the sealing plate cell E and the sealing plate cell F are spliced horizontally to serve as a third layer of sealing plate module.

[0021] The semicircular groove at the lower boundary center of the sealing plate cell C and the semicircular groove at the upper boundary center of the sealing plate cell E are connected to form a circular hole for passing through a valve side sleeve; and the semicircular groove at the lower boundary center of the sealing plate cell D and the semicircular groove at the upper boundary center of the sealing plate cell F are connected to form another circular hole for passing through a valve side sleeve.

[0022] Advantages:

[0023] (1) The present application overcomes the shortcomings of the existing concrete steel sealing structure of the ultra-high voltage converter station, such as large quality and possible secondary hazards. Combined with the protection idea of "soft overcomes hard", the energy absorption of the flexible material is fully utilized, and the quality of the sealing structure is greatly reduced. The flexible composite structure can effectively improve the fire prevention and control ability of the sealing system and avoid the damage of the valve hall internal facilities caused by the fire or explosion due to the failure of the converter transformer.

[0024] (2) In the sealing plate of the present application, the 3D printed multi-stable polyurethane foam structure is used in the explosion-resistant layer, which can effectively prolong the action time of the compression load; and the compression energy absorption performance of the polyurethane foam is improved from both the porous material properties and the structural properties of the polyurethane foam.

[0025] (3) The sealing plate of the present application combines the fireproof sealing plate and the explosion-resistant door of the existing ultra-high voltage converter station sealing structure into one, adopts the idea of lightweight fireproof and explosion-resistant flexible structure integration, and greatly reduces the volume and thickness of the sealing structure.

[0026] (4) The sealing plate of the present application can adopt prefabricated molding design, factory prefabricated production and on-site assembly construction technology, thereby enabling the sealing anti-explosion system structure to be greatly simplified, the number of on-site construction procedures to be reduced by about 90%, and the construction period to be shortened by about 80%.

[0027] (5) The sealing plate of the present application can adopt modular design, and in the case of not serious damage after explosion impact, the spare prefabricated module plate is used for replacement, only partial maintenance is needed, and the sealing plate can be reused, thereby greatly shortening the power-off time. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of a cell of the sealing plate;

[0029] Figure 2 is a structural schematic diagram of a multi-stable cell without foam filling in a multi-stable gradient polyurethane foam layer;

[0030] Figure 3 is a structural schematic diagram of a multi-stable gradient polyurethane foam layer;

[0031] Figure 4 is a schematic diagram of a compression energy absorption process of a multi-stable polyurethane foam cell;

[0032] Figure 5 is a schematic diagram of a sealing plate of a converter station in Example 3;

[0033] Figure 6 is a structural schematic diagram of a sealing system of a sealing plate of a converter station based on the present application.

[0034] Wherein: 1 - fireproof cladding layer; 2 - anti-explosion layer; 3 - fireproof layer; 4 - sealing plate cell; 5 - converter station body; 6 - waterproof sleeve A; 7 - outdoor side hole edge; 8 - fireproof wall; 9 - sealing plate; 10 - shielding layer; 101 - stainless steel keel; 11 - indoor side hole edge; 12 - waterproof sleeve B; 13 - valve side sleeve; 14 - foam cell module. DETAILED DESCRIPTION

[0035] The present application will be further described in detail below in combination with the drawings and examples.

[0036] Example 1:

[0037] The present example provides a flexible fireproof anti-explosion integrated sealing plate of a converter station, which adopts the protection idea of "soft overcomes hard", and combines the functions of fireproofing and anti-explosion, not only can avoid the damage of valve hall internal facilities caused by fire or explosion due to converter transformer failure, but also fully plays the protection advantages of high energy absorption of flexible materials, greatly reducing the mass of the sealing structure.

[0038] The plugging plate is designed as a multi-layer structure based on the idea of explosion resistance and fire prevention integration, including a fireproof cladding layer 1, an explosion resistance layer 2, and a fireproof layer 3; the fireproof cladding layer 1 is cladded outside the explosion resistance layer 2; as an example, the material of the fireproof cladding layer 1 is a high-performance fireproof fiber such as aramid fiber two-dimensional woven fabric; the material of the explosion resistance layer 2 is polyurethane foam, that is, the explosion resistance layer 2 is a polyurethane foam layer; the fireproof layer 3 is a polyurea reinforced glass fiber plate, and multiple polyurea reinforced glass fiber plates can be arranged. The fireproof cladding layer 1 and the fireproof layer 3 in the plugging plate are both made of high-performance fibers, and the high-performance fiber composite material combines the excellent mechanical properties of fibers and the impact resistance of special resin matrix, and is one of the most promising bulletproof materials in the world with the most research, the fastest market development, and the most promising. Compared with steel, the fiber reinforced resin matrix composite material has the characteristics of light weight, excellent explosion resistance, good environmental tolerance, strong designability, etc. The fireproof layer 3 adopts a polyurea reinforced glass fiber plate, the polyurea is a super viscoelastic body, has low cost, light weight, high impact energy absorption, high toughness, simple construction process, fast curing speed during spraying, easy thickness adjustment, and strong adhesion with metal and non-metal material substrates. The explosion resistance layer 2 adopts polyurethane foam, which has simple structure, long product life, high construction efficiency, high fire resistance level, and low comprehensive cost.

[0039] When the plugging plate is used, the explosion resistance layer 2 cladded by the fireproof cladding layer 1 serves as the explosion-facing surface, and the fireproof layer 3 serves as the explosion-backing surface, and the two structures can be pasted by magic tape.

[0040] As an example, the overall thickness of the polyurethane foam structure cladded by high-performance fireproof fiber (that is, the explosion resistance layer 2 cladded by the fireproof cladding layer 1) is preferably 20mm-40mm; the aramid fiber can be used as the preferred material of the high-performance fireproof fiber due to its high flame retardant performance, and two-dimensional woven cloth, three-dimensional woven cloth, and no-woven cloth can be used, and the thickness of the fireproof cladding layer 1 is preferably 5mm-10mm.

[0041] As an example, the overall thickness of the fireproof layer 3 is preferably 40mm-60mm.

[0042] As an example, the plugging plate can be designed in a modular manner, and multiple plugging plate cells (each plugging plate cell can be considered as a smaller plugging plate) can be planarly spliced to form a plugging plate with a larger protection area. Figure 1

[0043] Typical converter transformers have two valve-side bushings, and two round holes are arranged on the plugging plate to pass through the valve-side bushings.

[0044] ​As an example, the sealing plate is prefabricated by a modular factory (the conventional sealing structure is cast-in-place concrete), and then is efficiently assembled on-site on a stainless steel skeleton. Thus, the sealing system structure of the converter station can be greatly simplified, the number of on-site construction procedures is reduced by about 90%, and the construction period is shortened by about 80%. The fireproof sealing and blast-resistant door of the existing scheme are relatively expensive and have low utilization, and the scheme integrates the two to reduce the cost by about 50%.

[0045] Embodiment 2:

[0046] On the basis of the above-described embodiment 1, the present embodiment provides a preferred structural form of the blast-resistant layer 2.

[0047] In the present embodiment, the blast-resistant layer 2 is a multi-stable gradient polyurethane foam layer based on 3D printing.

[0048] The porous polyurethane foam itself has excellent compression energy absorption characteristics; based on the 3D printing basis, a multi-stable gradient polyurethane foam layer is constructed through geometric model construction and optimization. As shown in Figure 3 , the multi-stable gradient polyurethane foam layer is composed of a plurality of foam cell modules 14 stacked along the thickness direction, and each foam cell module 14 can be a single-layer or multi-layer structure; along the thickness direction from top to bottom, the density of each foam cell module 14 increases, thereby forming a strength gradient based on the gradual increase in density through the foam density. As an example, as shown in Figure 3 , each foam cell module 14 is a two-layer structure including two foam cell layers; let the density of the first foam cell module from top to bottom be ρ1, the density of the second foam cell module 14 be ρ2, the density of the third foam cell module 14 be ρ3, and the density of the fourth foam cell module 14 be ρ4; then ρ1 < ρ2 < ρ3 < ρ4.

[0049] When used in the sealing plate, the upper end surface of the multi-stable gradient polyurethane foam layer (i.e., the side with smaller density) serves as the blast-facing surface, and the other side (i.e., the side with larger density) is connected to the fireproof layer 3. As shown in Figure 4 , (in this figure, the multi-stable gradient polyurethane foam layer is composed of three foam cell modules 14 stacked along the thickness direction, and each foam cell module 14 is a single-layer structure), under the action of the shock wave, the multi-stable gradient polyurethane foam layer is gradually compressed from top to bottom: first, the first foam cell module is compressed and compacted, and the remaining foam cell modules 14 serve as the main support to form the first stable state; under the continuous action of the compression load, the second foam cell module 14 is continuously compressed until it is compacted, and the third foam cell module 14 serves as the main support to form the second stable state. In this way, a multi-stable structure is formed.

[0050] The composition of the multi-stable gradient polyurethane foam layer comprises a 3D-printed multi-stable structure framework made of polyurethane plastic or polymer material, and polyurethane foam filled in the multi-stable structure framework; the 3D-printed multi-stable structure framework is a planar honeycomb structure comprising a plurality of multi-stable cells as shown in Figure 2 The multi-stable gradient polyurethane foam layer can be obtained by filling polyurethane foam in each multi-stable cell.

[0051] The multi-stable polyurethane foam structure of the anti-explosion layer 2 can effectively prolong the action time of the compression load; the compression energy absorption performance of the polyurethane foam is improved from both the porous material characteristics and the structural characteristics of the polyurethane foam.

[0052] Embodiment 3:

[0053] The embodiment provides a sealing system based on the flexible fireproof anti-explosion integrated converter station sealing plate in Embodiment 1 or Embodiment 2.

[0054] As shown in Figure 6 , the sealing system comprises, from outside to inside, a converter station body 5, a waterproof sleeve A 6, an outdoor side hole edge 7, a fireproof wall 8, a sealing plate 9, a shielding layer 10, an indoor side hole edge 11, and a waterproof sleeve B 12; the converter station body 5 has two valve side sleeves 13 on the end face facing the outdoor side, and the two extended valve side sleeves 13 have a great influence on the sealing design. The flexible fireproof anti-explosion integrated ultra-high voltage converter station sealing structure is used for the safety protection of the whole surface, but the positions of the two sleeves need to be considered, and therefore, a through hole for the valve side sleeve of the converter transformer to pass through is arranged on the sealing plate.

[0055] The shielding layer 10 is a stainless steel profiled steel plate arranged on a stainless steel keel 101.

[0056] The waterproof sleeve A 6 is a silicone waterproof sleeve, two waterproof sleeves A 6 are respectively sleeved on the two valve side sleeves 13, and the outdoor side hole edge 7 is arranged at the outdoor side hole; the sealing plate 9 is pre-fabricated in a factory and installed on the stainless steel keel 101 of the shielding layer 10; then the sealing plate 9 and the shielding layer 10 are integrally installed on the original fireproof wall 8 of the valve hall; the two valve side sleeves 13 pass through the round holes at the corresponding positions of the sealing plate 9 and the shielding layer 10 and then protrude outside and are sleeved with the waterproof sleeve B 12. The indoor side hole edge 11 is arranged at the indoor side hole.

[0057] In this example, the total height of the ultra-high voltage converter station plugging structure is 4740mm, the total width is 4540mm, and the radius of the sleeve on the side of the center valve is 567mm. Based on this, a lightweight fireproof and explosion-proof composite flexible plugging plate is prepared by using a modular splicing method. The plugging plate is divided into six plugging plate cells 4, which are plugging plate cell A, plugging plate cell B, plugging plate cell C, plugging plate cell D, plugging plate cell E and plugging plate cell F. The length and width dimensions of plugging plate cell A and plugging plate cell B are 2270mm x 800mm, and the two are spliced horizontally. The length and width dimensions of plugging plate cell C and plugging plate cell D are 2270mm x 3240mm, and the two are spliced horizontally, and the lower boundary center is reserved with a semicircle of radius 567mm. The length and width dimensions of plugging plate cell E and plugging plate cell F are 2270mm x 700mm, and the upper boundary center is reserved with a semicircle of radius 567mm, and the two are spliced horizontally. Then the three horizontally spliced modules are spliced vertically in turn. At this time, the lower boundary center semicircle of plugging plate cell C and the upper boundary center semicircle of plugging plate cell E are butt jointed to form a circular hole for the valve side sleeve to pass through; the lower boundary center semicircle of plugging plate cell D and the upper boundary center semicircle of plugging plate cell F are butt jointed to form another circular hole for the valve side sleeve to pass through, as shown in FIG. 13. Figure 5

[0058] In this example, the thickness of the cladding layer 1 is 5mm, the thickness of the explosion-resistant layer 2 is 25mm, the thickness of the fireproof layer 3 is 50mm, and the overall thickness of the plugging plate cell 4 is 80mm.

[0059] The explosion-resistant door of the traditional converter station plugging system is constructed on the outside of the valve hall wall, and the explosion-resistant door can protrude from the outside wall, such as pouring concrete, etc., and there are fire pipelines, BOXIN, sound-absorbing bodies, converter transformer auxiliary components and other facilities on the outside, which are easy to cause conflicts, so the facilities on the outside of the wall can be affected during construction. The plugging plate in the above plugging system combines the traditional plugging plate and the explosion-resistant door, and is arranged inside the valve hall wall, without protruding from the indoor and outdoor walls, effectively avoiding the risk of conflict.

[0060] Although the present application has been described in detail by the general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.​

Claims

1. A flexible fireproof blast integrated converter station containment system, characterized in that, The blocking system from outdoor to indoor is in turn: converter station body (5), waterproof sleeve A (6), outdoor side hole edge (7), fireproof wall (8), blocking plate (9), shielding layer (10), indoor side hole edge (11) and waterproof sleeve B (12), the blocking plate (9) is installed on the stainless steel keel (101) of the shielding layer (10); The blocking plate (9) comprises: an anti-explosion layer (2) and a fireproof layer (3) arranged in layers; the anti-explosion layer (2) has a fireproof cladding layer (1) on the outside; The anti-explosion layer (2) is the blast face, and the fireproof layer (3) is the back blast face; The anti-explosion layer (2) is a polyurethane foam layer; the material of the fireproof layer (3) is fireproof fiber.

2. The flexible fireproof blast integrated converter station containment system of claim 1, wherein: The anti-explosion layer (2) is a multi-stable gradient polyurethane foam layer; The multi-stable gradient polyurethane foam layer comprises a plurality of foam cell module (14) distributed along the thickness direction, each foam cell module (14) is a single layer or multi-layer structure; along the thickness direction, the density of each foam cell module (14) increases from top to bottom; wherein the lower end surface of the multi-stable gradient polyurethane foam layer is connected with the fireproof layer (3).

3. The flexible fireproof blast integrated converter station containment system of claim 2, wherein: The multi-stable gradient polyurethane foam layer comprises a 3D printed multi-stable structure skeleton and polyurethane foam filled in the multi-stable structure skeleton.

4. The flexible fireproof blast integrated converter station containment system of claim 3, wherein: The 3D printed multi-stable structure skeleton is a planar honeycomb structure, comprising a plurality of multi-stable cells; each multi-stable cell is filled with polyurethane foam.

5. The flexible fireproof blast integrated converter station containment system of any one of claims 1-4, wherein: A through hole is arranged on the blocking plate for the valve side bushing of the converter transformer to pass through.

6. The flexible fireproof blast integrated converter station containment system of any one of claims 1-4, wherein: The blocking plate is a modular structure, which is composed of a plurality of blocking plate cell planes.

7. The flexible fireproof blast integrated converter station containment system of any one of claims 1-4, wherein: The blocking plate is a prefabricated part.

8. The flexible fireproof blast integrated converter station containment system of any one of claims 1-4, wherein: The fireproof layer (3) comprises a plurality of polyurea reinforced glass fiber plates.

9. The flexible fireproof blast-integrated converter station containment system of claim 1, wherein: The blocking plate (9) is a modular splicing structure, comprising six blocking plate cells (4), which are blocking plate cell A, blocking plate cell B, blocking plate cell C, blocking plate cell D, blocking plate cell E and blocking plate cell F, The blocking plate cell A and the blocking plate cell B are spliced horizontally as a first layer blocking plate module; the blocking plate cell C and the blocking plate cell D are spliced horizontally as a second layer blocking plate module; the blocking plate cell E and the blocking plate cell F are spliced horizontally as a third layer blocking plate module; The semicircular groove at the lower boundary center of the blocking plate cell C and the semicircular groove at the upper boundary center of the blocking plate cell E are connected to form a circular hole for the valve side bushing to pass through; the semicircular groove at the lower boundary center of the blocking plate cell D and the semicircular groove at the upper boundary center of the blocking plate cell F are connected to form another circular hole for the valve side bushing to pass through.

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