CN214950685U

CN214950685U - Denitration heating distribution device

Info

Publication number: CN214950685U
Application number: CN202121291103.XU
Authority: CN
Inventors: 聂海波; 邓俊; 杨长军
Original assignee: Sichuan Junhe Environmental Protection Co ltd
Current assignee: Sichuan Junhe Environmental Protection Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-11-30
Anticipated expiration: 2031-06-10

Abstract

The utility model discloses a denitration heating distributor, including pipeline assembly, pipeline assembly is provided with one at least between denitration flue and heating furnace flue gas passageway and communicates both, pipeline assembly is multilayer composite pipe, and it includes interior bobbin, fibre insulating layer, pours flame retardant coating and shell body that from interior to exterior set gradually, still be provided with the expansion joint on the interior bobbin. Denitration heating distribution device ensure that the flue gas fully sends into the denitration flue, ensure that flue gas temperature satisfies reaction temperature, provide the thermal energy clearance for interior bobbin to on making the thermal energy of interior bobbin can not use the shell body, guarantee pipeline subassembly is long-term in intact state, avoid appearing the situation that the flue gas was leaked in the pipeline spalling, eliminate the potential safety hazard.

Description

Denitration heating distribution device

Technical Field

The utility model relates to a deNOx systems technical field especially relates to a denitration heating distributor.

Background

The treatment process aiming at the ultralow emission of the steel smoke mainly comprises an electrostatic dust collector, semi-dry desulfurization, GGH heating, furnace afterburning, SCR denitration, GGH cooling, an electrostatic dust collector, wet desulfurization, wet electricity, GGH heating, furnace afterburning, GGH cooling, an electrostatic dust collector, GGH heating, furnace afterburning, GGH cooling, wet desulfurization, wet electricity, an electrostatic dust collector, GGH heating, furnace afterburning, GGH cooling, semi-dry desulfurization and the like, wherein the smoke temperature is generally 160 ℃, the current catalyst for industrial operation still mainly comprises medium and low temperature (250-, the denitration efficiency can be ensured only by fully turbulently mixing the hot flue gas and the cold flue gas, thereby ensuring NO_XThe continuous stability of the product reaches the standard.

The existing heating distribution device is easy to burn out, the denitration system is forced to be shut down, and NO is generated_XThe discharge of the device can not reach the standard, the existing heating distribution device is generally connected with a Q235 common steel pipe by welding through a 310S stainless steel pipe, the thermal expansion systems are not consistent under the high temperature condition, the condition of welding seam cracking is easy to occur, high-temperature smoke is sprayed out from the cracking position and flees to each part of the system through the interlayer gaps of the heat insulation cotton and the outer color steel tiles, the color steel tiles, the equipment, the flue shell and the steel structure frame are baked to cause the beam column structure to deform and the paint to crack and fall off, the air mixer shell is burnt to be carbonized by high-temperature smoke gas, the leakage of the high-temperature smoke gas is further aggravated, the iron wires binding the heat preservation surface and the color steel tiles externally coated with the heat preservation surface are burnt to be carbonized, finally, the heat preservation cotton is scattered, the color steel tiles fall off, a large amount of hot smoke gas leaks, and the baking deformation of the peripheral steel structure beam column is aggravated, if the denitration tower is not processed in time, the structural members in the area can be caused to have performance change, and finally the denitration tower collapses.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve and the technical task that provides improve prior art, provide a denitration heating distributor, solve the heating distributor among the prior art and crack easily under high temperature environment, burn out, have the problem of potential safety hazard.

For solving the above technical problem, the technical scheme of the utility model is that:

the utility model provides a denitration heating distribution device, includes pipeline assembly, pipeline assembly is provided with one at least between denitration flue and heating furnace flue gas passageway and communicates both, pipeline assembly is multilayer composite pipe, and it includes interior bobbin, fibre insulating layer, pours flame retardant coating and shell body that from interior to exterior set gradually, still be provided with the expansion joint on the interior bobbin. The utility model discloses a denitration heating distribution device does not directly welded connection inner bobbin and shell body, the fibre insulating layer and pouring flame retardant coating are arranged at the interval between the two, the flue gas flows into the denitration flue from the heating furnace flue gas passageway along the inner bobbin, the heat of flue gas can make the inner bobbin have higher temperature, the fibre insulating layer reduces the heat and conducts outwards, ensure that the flue gas temperature satisfies the required reaction temperature of SCR denitration catalyst, the pouring flame retardant coating has good structural strength and thermal shock resistance while further insulating heat, can ensure the stability of the whole structure of pipeline assembly, avoid the condition of deformation of pipeline assembly, ensure the connection stability and the sealing performance of pipeline assembly, denitration flue and heating furnace flue gas passageway, and the fibre insulating layer is made of fibre material, has certain flexibility, in addition, the expansion joint is arranged on the inner bobbin, the thermal expansion gap is provided for the inner bobbin, so that the thermal expansion of the inner bobbin can not act on the outer shell, the long-acting intact state of the pipeline assembly is guaranteed, the condition that smoke is leaked due to expansion crack of the pipeline is avoided, the condition that equipment and assemblies are burnt out can not occur, and potential safety hazards are eliminated.

Furthermore, a plurality of anchoring pieces are arranged on the inner surface of the outer shell at intervals, and the anchoring pieces stretch into the pouring refractory layer, so that the outer shell and the pouring refractory layer are connected into a rigid whole, and the structure strength is high and the stability is good.

Furthermore, the pouring fire-resistant layer is formed by pouring clay-mullite light fire-resistant material, and has good heat resistance, low heat capacity, low heat conductivity coefficient, high strength and good thermal shock resistance.

Furthermore, the fiber heat insulation layer is made of ceramic fibers, and is light in weight, high temperature resistant, good in thermal stability, low in thermal conductivity, small in specific heat and resistant to mechanical vibration.

Furthermore, the pipeline assembly penetrates through the wall surface of the denitration flue and extends into the denitration flue, so that the flue gas is fully fed into the denitration flue, and the temperature of the flue gas meets the reaction temperature required by the SCR denitration catalyst.

Further, at the inside tip of stretching into the denitration flue of pipeline subassembly, be connected through supplementary support piece between interior bobbin and the shell body, improve structural stability, avoid interior bobbin to take place to shift in the tenesmus to heating furnace flue gas passageway.

Furthermore, the auxiliary supporting piece comprises a first support connected with the inner bobbin and a second support connected with the outer shell, the first support and the second support are connected through bolts, and a heat insulation pad is arranged between the first support and the second support at an interval, so that the structure is simple, the structural stability is improved, and heat exchange between the inner bobbin and the outer shell is avoided.

Furthermore, pour the fire-resistant layer and extend and cover the inboard whole circumference of heating furnace flue gas passageway in order to constitute the horizontal pipe section to heating furnace flue gas passageway, improve structural stability to improve and connect the leakproofness, avoid the flue gas to leak, ensure that the flue gas is abundant sends into the denitration flue.

Compared with the prior art, the utility model discloses the advantage lies in:

denitration heating distribution device ensure that the flue gas fully sends into the denitration flue, ensure that flue gas temperature satisfies reaction temperature, provide the thermal energy clearance for interior bobbin to on making the thermal energy of interior bobbin can not use the shell body, guarantee pipeline subassembly is long-term in intact state, avoid appearing the situation that the flue gas was leaked in the pipeline spalling, eliminate the potential safety hazard.

Drawings

FIG. 1 is a schematic side sectional view of a denitration heating distributor;

FIG. 2 is a schematic structural view of an auxiliary support;

fig. 3 is a schematic structural view of a horizontal pipe section for pouring a refractory layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model discloses a denitration heating distribution device, high temperature resistance can be good, and structural stability is good, is difficult impaired, long service life.

As shown in fig. 1 to 3, a denitration heating distribution device mainly includes a pipe assembly, the pipe assembly is disposed between a denitration flue a and a flue gas channel b of a heating furnace to communicate the denitration flue a and the flue gas channel b, the pipe assembly may be disposed alone or in combination with the denitration flue a and the flue gas channel b, the pipe assembly is a multilayer composite pipe, and includes an inner bobbin 1, a fiber heat insulation layer 5, a pouring fire-resistant layer 3, and an outer shell 2, which are sequentially disposed from inside to outside, and the inner bobbin 1 is further provided with an expansion joint 6.

Specifically, the inner bobbin 1 is a 310S stainless steel bobbin, the fiber heat-insulating layer 5 is made of ceramic fibers, and may be made of heat-insulating fiber materials such as glass fibers, rock wool, asbestos, etc., the fiber heat-insulating layer 5 has a radial thickness of 50-100mm, the casting fire-resistant layer 3 is cast by using a clay-mullite light refractory material, the casting fire-resistant layer 3 has a radial thickness of 100-400mm, the structural strength is high, the heat resistance is good, the outer shell 2 is made of a steel pipe with a wall thickness of 6-10 mm, in order to improve the structural stability, a plurality of anchoring pieces 4 are arranged on the inner surface of the outer shell 2 at intervals, the anchoring pieces 4 are arranged in a quincunx shape, the outer shell 2 is divided into two semi-circular or multiple circular arc sections along the circumference, the complete outer shell 2 is combined by adopting a splicing manner, the clay-mullite light refractory material is cast between the outer shell 2 and the fiber mullite heat-insulating layer 5, after the material solidification, then anchor assembly 4 stretches into in pouring flame retardant coating 3, thereby it is connected for rigid whole with shell body 2 to pour flame retardant coating 3, better structural strength and stability have, the gap that is difficult for the inflation deformation and produces, fibre insulating layer 5 has flexibility in addition expansion joint 6, for interior bobbin provides the thermal expansion clearance, fibre insulating layer 5 and pouring flame retardant coating 3 realize good heat-proof quality, avoid the heat to conduct for shell body 2 from interior bobbin, thereby thermal expansion can not take place for shell body 2, guarantee structural dimension stability.

The pipe assembly passes and stretches into denitration flue a's inside from denitration flue a's wall, and denitration flue a's lateral wall trompil is inserted for the pipe assembly, pipe assembly's shell body 2 stretches into denitration flue a's inside length and is 150~500mm to shell body 2 carries out welded connection with denitration flue a's wall, because shell body 2 can not take place the thermal energy, thereby ensures welded connection's stability, the situation of welding seam fracture can not appear, and guarantee leakproofness avoids appearing the situation of flue gas leakage.

Further, at the inside tip of the inside denitration flue a that stretches into of pipeline subassembly, be connected through auxiliary support piece 7 between interior bobbin 1 and the shell body 2, avoid dropping into the heating furnace flue gas passageway, it is concrete, auxiliary support piece 7 includes the support two of being connected with interior bobbin 1, being connected with shell body 2, and support two pass through bolted connection and the interval has the heat insulating mattress between the two with support two, simple structure, and it is convenient to implement, when bobbin 1 stability in the guarantee, also avoid interior bobbin and shell body to take place heat exchange, avoid the shell body to take place the thermal energy and lead to shell body and denitration flue a's welding department to take place the fracture situation, guarantee long-term stable leakproofness, avoid the flue gas leakage.

In this embodiment, the pouring refractory layer 3 extends into the heating furnace flue gas channel b and covers the whole circumferential direction of the inner side of the heating furnace flue gas channel b to form the transverse pipe section 8, so that the structural stability and the connection tightness are improved, and the flue gas leakage is avoided.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. The utility model provides a denitration heating distribution device, its characterized in that includes the pipeline subassembly, the pipeline subassembly is provided with one at least between denitration flue (a) and heating furnace flue gas passageway (b) and communicates both, the pipeline subassembly is multilayer composite pipe, and it includes interior bobbin (1), fibre insulating layer (5), pours flame retardant coating (3) and shell body (2) that from interior to exterior set gradually, still be provided with expansion joint (6) on interior bobbin (1).

2. The de-nitrification heating distribution apparatus according to claim 1, wherein a plurality of anchoring members (4) are provided at intervals on the inner surface of the outer shell (2), and the anchoring members (4) are inserted into the casting refractory layer (3).

3. The denitration heating distribution apparatus according to claim 1, wherein the casting refractory layer (3) is cast by clay-mullite lightweight refractory material.

4. The denox heating profile apparatus of claim 1, wherein the fibrous insulation layer (5) is made of ceramic fibers.

5. The denitration heating distribution apparatus according to any one of claims 1 to 4, wherein the duct assembly penetrates through the wall surface of the denitration flue (a) and protrudes into the inside of the denitration flue (a).

6. The denitration heating distribution apparatus according to claim 5, wherein the inner bobbin (1) and the outer shell (2) are connected by an auxiliary support member (7) at an end portion of the duct assembly extending into the inside of the denitration flue (a).

7. The denox heating distribution apparatus of claim 6, wherein the auxiliary support member (7) comprises a first support frame connected to the inner bobbin (1) and a second support frame connected to the outer shell (2), the first support frame and the second support frame being connected by bolts and having an insulating mat spaced therebetween.

8. The denitration heating distribution apparatus according to any one of claims 1 to 4, wherein the casting refractory layer (3) extends into the flue gas channel (b) of the heating furnace and covers the whole circumference of the inner side of the flue gas channel (b) of the heating furnace to form the transverse pipe section (8).