CN220453708U

CN220453708U - Fireproof peep hole coking structure

Info

Publication number: CN220453708U
Application number: CN202322079554.2U
Authority: CN
Inventors: 熊天洪; 罗联锋; 何俊; 施明; 张堃; 成焕; 李昌平; 李国发; 王章成; 尹力
Original assignee: Yunnan Huadian Zhenxiong Power Generation Co ltd
Current assignee: Yunnan Huadian Zhenxiong Power Generation Co ltd
Priority date: 2023-08-03
Filing date: 2023-08-03
Publication date: 2024-02-06
Anticipated expiration: 2033-08-03

Abstract

The utility model discloses a fireproof peeping view mirror coking structure, which consists of a fire detection sleeve assembly arranged on a secondary air bellow and a fire detection assembly penetrating through the fire detection sleeve assembly, wherein an overfire air bellow is arranged at the top of the secondary air bellow through a partition plate, and the fire detection sleeve assembly comprises: the outer side of the inner sleeve is also provided with a first outer sleeve arranged at the top of the overfire air box and a second outer sleeve arranged at the joint of the secondary air box and the overfire air box; the anti-coking air sleeve is arranged at the bottom end of the inner sleeve and is positioned at the bottom end of the secondary air box; the tee bend cooling air pipe is arranged at the top end of the inner sleeve pipe and used for injecting cooling air into the inner sleeve pipe. According to the utility model, the fire detection sleeve assembly is arranged outside the fire detection assembly, and the anti-coking air sleeve is arranged at the bottom of the overgrate air bellows, so that overgrate air in the overgrate air bellows can be cited as the anti-coking air, and the fire detection sleeve is purged, so that the lower part of the peeping scope main body is effectively prevented from coking.

Description

Fireproof peep hole coking structure

Technical Field

The utility model relates to the technical field of thermal power generation, in particular to a coking structure of a fireproof peep sight glass.

Background

The fire detection is a device for detecting whether the hearth of the thermal generator set has flame or not and providing a protection signal, and is an important condition for tripping the total fuel of the boiler.

The current market generally adopts a national first 600MW supercritical W flame furnace produced by the technology of Babuckey corporation, the UK, as fire detection, the flame furnace uses a slit burner, wherein the fire detection signal of the burner has the problems of flickering, poor detection effect and the like, seriously threatens the safety monitoring and the protection control of a hearth, and has great potential safety hazard.

Through a large number of investigation and analysis on site, the main reason that the fire detection effect is poor is that the lower part of the fire detection peep sight glass is easy to coke, and normal measurement is affected.

Specifically, the primary fire detection device mainly comprises a fire detection sleeve assembly and a fire detection assembly, wherein the fire detection sleeve comprises a sleeve and a cooling air tee joint, the fire detection assembly comprises a peep mirror, optical fibers and a probe, the primary fire detection device is generally arranged on two water-cooled wall fins at the bottom of a secondary air box, the lower part of the peep mirror is easy to coke, and a fire detection monitoring sight is blocked.

Therefore, the application particularly provides a fireproof peeping mirror coking structure to solve the technical problems.

Disclosure of Invention

The utility model mainly aims to provide a fire-proof peeping view mirror coking structure which uses secondary air to sweep the periphery of the fire-proof peeping view mirror and cool a small area, effectively prevents coking of the lower part of the peeping view mirror and ensures that fire-proof monitoring sight is not blocked, thereby improving fire-proof detection effect and quality and reducing equipment failure rate.

In order to solve the technical problem, the utility model provides a fireproof peeping view mirror coking structure, which consists of a fire detection sleeve assembly arranged on a secondary air bellow and a fire detection assembly penetrating through the fire detection sleeve assembly, wherein an overfire air bellow is arranged at the top of the secondary air bellow through a partition plate, and the fire detection sleeve assembly comprises:

the outer side of the inner sleeve is also provided with a first outer sleeve arranged at the top of the overfire air box and a second outer sleeve arranged at the joint of the secondary air box and the overfire air box;

the anti-coking air sleeve is arranged at the bottom end of the inner sleeve and is positioned at the bottom end of the secondary air box;

the tee bend cooling air pipe is arranged at the top end of the inner sleeve pipe and used for injecting cooling air into the inner sleeve pipe.

Further, the fire detection assembly comprises an optical fiber, a peeping mirror main body and a probe, wherein the peeping mirror main body and the probe are arranged at two ends of the optical fiber, the peeping mirror main body is arranged at the bottom of the secondary air bellows, and the probe is arranged above the overfire air bellows.

Further, the first outer sleeve, the second outer sleeve and the lower anti-coking sleeve are all made of carbon steel pipes.

Further, the inner sleeve and the second outer sleeve diameters are each set to DN50.

Further, the anti-scorching air sleeve diameter is set to DN108.

Further, the inner sleeve diameter is set to DN32.

The beneficial effects of the utility model are as follows:

according to the utility model, the anti-coking air sleeve is arranged at the bottom of the secondary air bellows, so that secondary air in the secondary air bellows can be cited as anti-coking air, and the fire detection outer sleeve is purged, so that coking of the lower part of the peeping mirror main body is effectively prevented, the fire detection monitoring sight is prevented from being blocked, the accuracy and the reliability of fire detection quantity are further improved, the effect and the quality of fire detection are ensured, and the equipment failure rate is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In the drawings:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of the structural assembly of the present utility model;

FIG. 3 is a schematic representation of the use of the present utility model;

FIG. 4 is a schematic view showing the structural disassembly of a conventional fireproof peeping sight glass;

FIG. 5 is a schematic view showing the assembly of a conventional fireproof inspection scope;

fig. 6 is a schematic view of a conventional fireproof inspection scope.

In the figure:

1. a fire detection sleeve assembly; 11. a first outer sleeve; 12. a second outer sleeve; 13. an inner sleeve; 14. a scorching-proof sleeve; 15. three-way cooling air pipes; 16. an integral sleeve;

2. a fire detection assembly; 21. a scope body; 22. an optical fiber; 23. a probe.

3. A secondary air box;

4. and (5) burning out the wind box.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. Embodiments and features of embodiments in this application may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the examples, see fig. 1 to 6 in detail.

As shown in fig. 1 to 3, the utility model provides a fire-proof peeping view mirror coking structure, which consists of a fire detection sleeve assembly 1 arranged on a secondary air bellow 3 and a fire detection assembly 2 penetrating through the fire detection sleeve assembly 1, wherein an overfire air bellow 4 is arranged at the top of the secondary air bellow 3 through a partition plate, and the fire detection sleeve assembly 1 comprises:

the outer side of the inner sleeve 13 is also provided with a first outer sleeve 11 arranged at the top of the overfire air bellows 4 and a second outer sleeve 12 arranged at the joint of the secondary air bellows 3 and the overfire air bellows 4;

the anti-coking air sleeve 14 is arranged at the bottom end of the inner sleeve 13 and is positioned at the bottom end of the secondary air box 3;

and a three-way cooling air pipe 15 arranged at the top end of the inner sleeve 13 for injecting cooling air into the inner sleeve 13.

In specific implementation, the first outer sleeve 11 is arranged at the top of the over-fire wind box 4 and is used for fixing the inner sleeve 13 and also can be used for adjusting the insertion depth of the inner sleeve 13; the second outer sleeve 12 is arranged on a connecting partition plate of the secondary air bellows 3 and the overfire air bellows 4 and is used for guiding the inner sleeve 13 to be inserted into the secondary air bellows 3; the inner sleeve 13 is used for installing the fire detection assembly 2 and is matched with the three-way cooling air pipe 15 to convey fire detection cooling air; the anti-coking air sleeve pipe 14 is arranged on the fin in the middle of two water cooling walls at the bottom of the over-fire air box 4 and used for guiding the inner sleeve pipe 13 and simultaneously introducing secondary air as anti-coking air to sweep the fire detection outer sleeve pipe.

At this time, the fire detection assembly 2 adopts a fire detection structure of the prior art, and specifically includes an optical fiber 22, a scope body 21 and a probe 23 disposed at two ends of the optical fiber 22, where the scope body 21 is disposed at the bottom of the secondary air bellows 3, and the probe 23 is located above the overfire air bellows 4.

At the moment, by arranging the fire detection sleeve assembly 1 outside the fire detection assembly 2 and arranging the anti-coking wind sleeve 14 at the bottom of the overgrate wind box 3, one end of the anti-coking wind sleeve 14 is positioned inside the overgrate wind box 3, and the other end is positioned below the overgrate wind box 3; therefore, secondary air in the secondary air bellows 3 can be cited as anti-coking air, and the fire detection outer sleeve is purged, so that coking of the lower part of the peeping scope main body 21 is effectively prevented, blocking of fire detection monitoring sight is avoided, accuracy and reliability of fire detection quantity are improved, the effect and quality of fire detection are guaranteed, and meanwhile, the equipment failure rate is reduced.

Specifically, when the anti-coking air sleeve 14 draws in a part of secondary air and sweeps the lower part of the scope main body 21, the secondary air can timely blow away ash particles in a small area range of the lower part of the scope main body 21 as the anti-coking air, so that the ash particles and the fused materials thereof are prevented from being attached to the lower part of the scope main body 21; meanwhile, the temperature of the secondary air is generally about 300-350 ℃ and is far lower than the temperature of thousands of ℃ in a boiler furnace, and the introduced secondary air is used as the anti-coking air, so that the temperature of a small area range at the lower part of the peeping mirror main body 21 is lower than the melting point temperature, and the dual functions of the anti-coking air can effectively prevent the lower part of the peeping mirror main body 21 from coking, ensure that the fire detection monitoring sight is not blocked, and further improve the accuracy and the reliability of the fire detection measurement.

In specific implementation, the installation mode of the fire detection sleeve assembly 1 comprises the following steps: firstly, the installation positions are determined on the same straight line of the top of the over-fire air bellows 4, the partition boards of the over-fire air bellows 4 and the secondary air bellows 3 and the water-cooled wall fin at the bottom of the secondary air bellows 3, and holes are respectively formed for installing the first outer sleeve 11, the second outer sleeve 12, the inner sleeve 13 and the anti-coking air sleeve 14.

After the sleeve structure is installed, the inner sleeve 13 is inserted, the insertion depth is confirmed, the sleeve is fixed by the locking screw on the first outer sleeve 11, and then the sleeve is connected with the three-way cooling air pipe 15.

After the installation, the peep-sight glass main body 21, the optical fiber 22 and the probe 23 are respectively installed as the fire detection assembly 2, and the fire detection assembly is connected with a corresponding air source and a cable, so that the installation is basically completed.

It should be noted that, since the prior art cited in the background art has already disclosed the scope body 21, the optical fiber 22 and the probe 23 as the fire detection assembly 2, the specific structure and principle of the scope body 21, the optical fiber 22 and the probe 23 will not be described in detail herein, the prior art will be directly adopted in actual use, and since the application improves the structure and the use method of the fire detection sleeve assembly 1 on the basis of the prior art, the working principle and structure of the overgrate air bellows 3 and the overfire air bellows 4 as the prior art will not be described in detail herein, and the prior art will be directly adopted in actual use.

The prior art needs to be described here, and the fireproof peeping mirror shown in fig. 4 and 5 is mainly used for a slit burner of a 600MW supercritical "W" flame furnace mentioned in the background art, and the fire detection sleeve assembly 1 used is composed of an integral sleeve 16 and a three-way cooling air pipe 15 positioned at one end of the integral sleeve 16, at this time, the integral sleeve 16 is fixed in the overgrate air box 3, and extends downwards to the bottom of the overgrate air box 3 for using the fire detection assembly 2 as shown in fig. 6.

In addition, compared with the prior art, because the integrated sleeve 16 in the prior art is welded and fixed at the top and the lower part of the overgrate air box 3 and cannot be adjusted or pulled out, the first outer sleeve 11 of the application can be further improved, namely, a locking screw is arranged on the first outer sleeve 11 and used for fixing the inner sleeve 13 and loosening the inner sleeve, the insertion depth of the inner sleeve 13 can be adjusted or pulled out integrally, at the moment, the inner sleeve 13 has flexible adjustment allowance, and the inner sleeve can be adjusted or pulled out according to the field condition and the requirement, so that the inner sleeve is convenient for practical use.

At this time, the prior art needs to be further explained, in order to overcome the influence of thermal stress effects such as thermal expansion, sinking and peristaltic motion of the air duct on the integrated sleeve 16, the lower part of the integrated sleeve 16 adopts a metal hose structure, and when the integrated sleeve is installed, the lower metal hose is usually left with allowance, forms a curved shape in the air duct, is flushed by high-temperature secondary air containing particles, and is easy to pass through holes and deform, the structure of the scope main body 21 of the fire detection assembly 2 is clamped in the curved metal hose in the process of overhauling or maintaining, the optical fiber 22 is difficult to be extracted, is often broken, and is more difficult to be assembled back after being extracted for overhauling or maintaining.

Therefore, compared with the prior art, the function of the inner sleeve 13 provided by the application is equivalent to that of the integrated sleeve 16 in the prior art, and the inner sleeve is made of a stainless steel straight tube, so that the peep hole body 21 can be effectively prevented from being clamped and the optical fiber 22 can be effectively prevented from being broken or directly broken in the overhaul or maintenance process, the failure rate and the damage rate of the peep hole body 21 and the optical fiber 22 in the fire inspection process can be greatly reduced, and the maintenance is more convenient.

At this time, the first outer sleeve 11, the second outer sleeve 12 and the anti-coking air sleeve 14 can be made of carbon steel pipes, so that the abrasion resistance of the device in the whole use process is ensured, and the service life of the structure is greatly prolonged by matching with the inner sleeve 13 made of stainless steel.

In addition, interior sleeve 13 diameter sets up to DN32, can effectively carry out the combination with fire detection component 2 and send into in the overgrate air bellows 3, and first outer tube 11 and second outer tube 12 diameter all set up to DN50, can effectively insert interior sleeve 13 inside first outer tube 11 and the second outer tube 12 and remain the space, can use under the condition that overgrate air bellows 3 and overfire air bellows 4 have the baffle this moment.

In addition, since the second outer sleeve 12 and the inner sleeve 13 are not fixed together, the inner sleeve 13 is in the center of the second outer sleeve 12, and has enough gaps between the two, so that the phenomena of deformation, abrasion or damage of the inner sleeve 13 caused by thermal stress effects such as thermal expansion, sinking and peristaltic movement of the air duct can be overcome.

The diameter of the anti-scorching air sleeve 14 is set to DN108, which is far larger than the diameters of the first outer sleeve 11, the second outer sleeve 12 and the inner sleeve 13, so that the anti-scorching air sleeve can be used as anti-scorching air, a larger cleaning space is provided at the position of the peeping mirror main body 21 when the fire detection outer sleeve is purged, and the small area cooling is performed on the position of the peeping mirror main body 21, thereby effectively preventing the lower part of the peeping mirror main body 21 from coking and ensuring that the fire detection monitoring sight is not blocked.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

In addition, if a directional indication (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present utility model, the directional indication is merely used to explain a relative positional relationship, a movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, in the embodiment of the present utility model, "a plurality of" means two or more.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Claims

1. The utility model provides a fire prevention peep hole coking structure, is examined sleeve assembly (1) and is passed fire on overgrate air bellows (3) and examine the fire and examine subassembly (2) of sleeve assembly (1) and constitute, its characterized in that, overgrate air bellows (3) top is equipped with through the baffle and fires over-fire air bellows (4), fire is examined sleeve assembly (1) include:

the device comprises an inner sleeve (13), wherein the outer side of the inner sleeve (13) is also provided with a first outer sleeve (11) arranged at the top of an overfire air bellows (4) and a second outer sleeve (12) arranged at the joint of a secondary air bellows (3) and the overfire air bellows (4);

the anti-coking air sleeve (14) is arranged at the bottom end of the inner sleeve (13) and is positioned at the bottom end of the secondary air box (3);

and the three-way cooling air pipe (15) is arranged at the top end of the inner sleeve (13) and is used for injecting cooling air into the inner sleeve (13).

2. The fire-proof peeping structure of claim 1, wherein the fire detection assembly (2) comprises an optical fiber (22), and a peeping mirror main body (21) and a probe (23) which are arranged at two ends of the optical fiber (22), the peeping mirror main body (21) is arranged at the bottom of the secondary air bellows (3), and the probe (23) is arranged above the over-fire air bellows (4).

3. The fireproof peep hole coking structure according to claim 1, wherein the first outer sleeve (11), the second outer sleeve (12) and the lower anti-coking sleeve (14) are all made of carbon steel tubes.

4. The fire-proof peeping view mirror coking structure according to claim 1, characterized in that the inner sleeve (13) is provided as a stainless steel tube.

5. The fire-proof peeping structure according to claim 1, characterized in that the diameters of the first outer sleeve (11) and the second outer sleeve (12) are set to DN50.

6. The fire-proof speculum coking structure according to claim 1, wherein the diameter of the anti-scorching air sleeve (14) is set to DN108.

7. The fire-proof peep hole coking structure according to claim 1, characterized in that the diameter of the inner sleeve (13) is set to DN32.