Axial fixing device for inner cylinder of pipeline spray desuperheater

Abstract

The utility model provides an axial fixing device for an inner barrel of a pipeline spray desuperheater, and belongs to the technical field of barrel fixing devices. The technical problem to be solved is to provide the improvement of the structure of the axial fixing device for the inner cylinder of the pipeline spray desuperheater. Comprising a desuperheater outer wall and a desuperheater inner cylinder, at least four threaded holes are formed in the desuperheater outer wall in the circumferential direction, holes are correspondingly formed in the positions, corresponding to the threaded holes in the desuperheater outer wall, of the desuperheater inner cylinder, a steel plate with threaded holes is arranged in the desuperheater inner cylinder, and the steel plate is fixed to the positions, corresponding to the holes, of the desuperheater inner cylinder. The desuperheater outer wall is fixedly connected with a steel plate in the desuperheater inner cylinder through an inner cylinder fixing bolt; a water spraying pipe is fixed between the desuperheater inner cylinder and the desuperheater outer wall; the axial fixing device is applied to axial fixing of the inner cylinder of the flute-type spray desuperheater.

Description

Technical Field

[0001] The utility model provides an axial fixing device for an inner cylinder of a pipeline water spraying desuperheater, belonging to the technical field of cylinder fixing devices. Background Art

[0002] With the continuous progress of society and the continuous improvement of the level of industrialization, the demand for steam with various parameters and new boilers with various parameters and various fuels are constantly emerging. The same heating station can often only provide steam with one parameter as a heat source (the highest value of the parameters required by all heat users). Other heat users with lower parameters are connected to the unit by the dry network. After the heat pipeline is connected to the unit, the unit is equipped with a temperature reduction and pressure reduction device to reduce the high-parameter steam to the steam parameters that meet their needs; at the same time, in order to ensure that the boiler itself can produce steam that meets the parameters under different working conditions, a desuperheater will be installed between different superheater heating surfaces to ensure the safe operation of the boiler. Therefore, various desuperheaters have gradually appeared. For example: surface desuperheater, water spray desuperheater. Surface desuperheater is generally a device that uses feed water as a cold medium to reduce the steam temperature. Its characteristics are that it does not require high quality of desuperheating water, but this type of desuperheater has a large adjustment inertia, a small steam temperature adjustment range, and a complex, bulky, easy to damage, and easy to leak. Therefore, it is rarely used in modern high-parameter, large-capacity boilers. The water spray desuperheater sprays water directly into the superheated steam to achieve the purpose of cooling. Its characteristics are simple structure, large temperature adjustment range, sensitivity, and easy automation. However, it has high requirements on the quality of water spray to ensure qualified steam quality.

[0003] When the steam flows through the inlet of the desuperheater, water is sprayed into the steam through a certain device to mix with the superheated steam. Within a certain distance range, the water droplets and the superheated steam exchange heat with each other, the water vaporizes and heats up, and the temperature of the superheated steam decreases. Finally, the two form a low-temperature superheated steam with new parameters. In the process of vaporization after the water and superheated steam are mixed, water droplets are prevented from falling on the outer wall of the desuperheater, causing thermal stress fatigue cracks on the outer wall, so an inner cylinder is provided in the water spray desuperheater. The inner cylinder is not under pressure, but only allows the desuperheated water to have a sufficient vaporization time, so the length of the inner cylinder is the distance the steam flows during the time when the desuperheated water is fully vaporized plus a little margin.

[0004] The fixation of the inner cylinder and the sealing between the inner and outer cylinders have always been the main problems in the design and manufacture of water spray desuperheaters. At present, four specially shaped blocks are welded on the flange of the desuperheater joint, and the inner cylinder inlet is made into a special shape so that the block and the outer edge of the inner cylinder inlet can be tightly combined, thereby achieving the purpose of axial positioning of the desuperheater inner cylinder. However, due to manufacturing and processing errors, there are always some small displacements between the inner cylinder and the outer wall, which causes stress in the water spray joint. At the same time, the longitudinal scouring of steam during the operation of the desuperheater will also aggravate the generation of stress. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, the utility model aims to solve the technical problem of providing an improved structure of an axial fixing device for an inner cylinder of a pipeline water spray desuperheater.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: an axial fixing device for the inner cylinder of a pipeline water spray desuperheater, comprising a desuperheater outer wall and a desuperheater inner cylinder, at least four threaded holes are opened circumferentially on the desuperheater outer wall, holes are opened on the desuperheater inner cylinder at positions corresponding to the threaded holes on the desuperheater outer wall, a steel plate with threaded holes is arranged inside the desuperheater inner cylinder, the steel plate is fixed at positions corresponding to the openings of the desuperheater inner cylinder, and the desuperheater outer wall is fixedly connected to the steel plate in the desuperheater inner cylinder through inner cylinder fixing bolts;

[0007] A water spray pipe is fixed between the desuperheater inner cylinder and the desuperheater outer wall, one end of the water spray pipe is fixed to the desuperheater outer wall and the desuperheater inner cylinder by a water spray pipe fixing bolt, and the other end of the water spray pipe extends out of the desuperheater outer wall and is connected to the water supply pipeline through a pipe joint.

[0008] A sleeve is connected to the portion of the water spray pipe extending out of the outer wall of the desuperheater, and a pipe joint is fixed to the top of the sleeve.

[0009] The steel plate is fixedly connected to the inner wall of the inner cylinder of the desuperheater by welding, and the steel plate is pressed against the inner wall of the inner cylinder of the desuperheater by inner cylinder fixing bolts.

[0010] The connection between the inner tube fixing bolt and the outer wall of the desuperheater is fixed by welding.

[0011] The connection between the water spray pipe fixing bolt and the outer wall of the desuperheater is fixed by welding.

[0012] The beneficial effects of the utility model compared with the prior art are:

[0013] 1) The utility model overcomes the relative axial displacement between the inner cylinder and the outer wall of the original spray cooler caused by assembly error, thereby causing bending stress on the nozzle.

[0014] 2) The utility model completely realizes the axial positioning between the inner cylinder and the outer wall of the desuperheater under the condition that the water spray pipe is completely stress-free, reduces the stress of the water spray sleeve on the outer wall of the desuperheater, and prolongs the service life of the desuperheater sleeve.

[0015] 3) The utility model completely offsets the friction caused by the longitudinal flushing of the inner cylinder by the steam during the operation of the desuperheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0019] In the figure: 1 is the outer wall of the desuperheater, 2 is the inner cylinder of the desuperheater, 3 is the steel plate, 4 is the sleeve, 5 is the pipe joint, 6 is the water spray pipe, 7 is the water spray pipe fixing bolt, and 8 is the inner cylinder fixing bolt. DETAILED DESCRIPTION

[0020] like Figure 1 and 2 As shown, the utility model provides an axial fixing device for the inner cylinder of a pipeline water spray desuperheater, comprising a desuperheater outer wall 1 and a desuperheater inner cylinder 2, wherein the desuperheater outer wall 1 is provided with beveled threaded holes (generally not less than four), holes are opened at corresponding positions of the desuperheater inner cylinder 2, so that the inner cylinder fixing bolts 8 can pass through the threaded holes and enter the interior of the desuperheater inner cylinder 2, the desuperheater inner cylinder 2 and the desuperheater outer wall 1 are positioned by a water spray pipe 6, and one end of the water spray pipe 6 extends out of the desuperheater inner cylinder 2 and the desuperheater outer wall 1, and a sleeve 4 is provided on the extended part, a pipe joint 5 is connected to the top of the sleeve 4, the water spray pipe 6 is connected to the water supply pipeline through the pipe joint 5, the other end of the water spray pipe 6 is fixed to the desuperheater outer wall 1 and the desuperheater inner cylinder 2 by a water spray pipe fixing bolt 7, and the water spray pipe fixing bolt 7 is firmly welded to the desuperheater outer wall 1. A steel plate 3 with threaded holes is installed inside the inner tube 2 of the desuperheater, so that the inner tube fixing bolts 8 are connected to the steel plate 3 through the threaded holes and pressed against the inner wall of the inner tube 1 of the desuperheater, the steel plate 3 connected to the inner tube fixing bolts 8 is welded to the inner tube 2 of the desuperheater, and the inner tube fixing bolts 8 are firmly welded to the outer wall 1 of the desuperheater.

[0021] The utility model is mainly used for axial fixation of the inner cylinder of a flute-type water spray desuperheater. When in use, it is first necessary to open a threaded hole on the outer wall 1 of the desuperheater, and then open a corresponding hole on the inner cylinder 2 of the desuperheater, and make a threaded steel plate 3 with the same aperture as the threaded hole on the outer wall 1 of the desuperheater, and then fix the water spray pipe 6 on the desuperheater to achieve preliminary positioning of the outer wall 1 of the desuperheater and the inner cylinder 2 of the desuperheater, and then place the steel plate 3 at the position corresponding to the hole on the inner cylinder 2 of the desuperheater, and then extend the inner cylinder fixing bolt 8 from the outer wall 1 of the desuperheater into the steel plate 3 in the inner cylinder 2 of the desuperheater and tighten it, and then weld the steel plate 3 to the inside of the inner cylinder 2 of the desuperheater after tightening, so as to achieve stable axial fixation between the outer wall 1 of the desuperheater and the inner cylinder 2 of the desuperheater.

[0022] Regarding the specific structure of the utility model, it should be explained that the connection relationship between the various component modules adopted in the utility model is definite and feasible. Except for special instructions in the embodiments, the specific connection relationship can bring corresponding technical effects and solve the technical problems raised by the utility model without relying on the execution of corresponding software programs. The components, modules, models of specific components and the connection methods between each other appearing in the utility model, as well as the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technologies and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete and feasible, and the corresponding physical products can be reproduced or obtained according to the technical means.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An axial fixing device for an inner cylinder of a pipeline water spray desuperheater, comprising a desuperheater outer wall (1) and a desuperheater inner cylinder (2), characterized in that: At least four threaded holes are formed on the outer wall (1) of the desuperheater in the circumferential direction, holes are formed on the inner tube (2) of the desuperheater at positions corresponding to the threaded holes on the outer wall (1), a steel plate (3) with threaded holes is provided inside the inner tube (2) of the desuperheater, the steel plate (3) is fixed at positions corresponding to the holes on the inner tube (2) of the desuperheater, and the outer wall (1) of the desuperheater is fixedly connected to the steel plate (3) inside the inner tube (2) of the desuperheater via inner tube fixing bolts (8); A water spray pipe (6) is fixed between the desuperheater inner cylinder (2) and the desuperheater outer wall (1); one end of the water spray pipe (6) is fixed to the desuperheater outer wall (1) and the desuperheater inner cylinder (2) via a water spray pipe fixing bolt (7); the other end of the water spray pipe (6) extends out of the desuperheater outer wall (1) and is connected to a water supply pipeline via a pipe joint.

2. The axial fixing device for the inner cylinder of a pipeline water spray desuperheater according to claim 1, characterized in that: The portion of the water spray pipe (6) extending out of the outer wall (1) of the desuperheater is connected to a sleeve (4), and a pipe joint (5) is fixed to the top of the sleeve (4).

3. The axial fixing device for the inner cylinder of a pipeline water spray desuperheater according to claim 1, characterized in that: The steel plate (3) is fixedly connected to the inner wall of the desuperheater inner cylinder (2) by welding, and the steel plate (3) is pressed against the inner wall of the desuperheater inner cylinder (2) by inner cylinder fixing bolts (8).

4. The axial fixing device for the inner cylinder of a pipeline water spray desuperheater according to claim 1, characterized in that: The connection between the inner tube fixing bolt (8) and the outer wall (1) of the desuperheater is fixed by welding.

5. The axial fixing device for the inner cylinder of a pipeline water spray desuperheater according to claim 1, characterized in that: The connection between the water spray pipe fixing bolt (7) and the outer wall (1) of the desuperheater is fixed by welding.

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