Superheater heated pipe protection device in dry quenching waste heat boiler

Abstract

The utility model discloses a superheater heated pipe protection device in a coke dry quenching waste heat boiler, which comprises a heated pipe group, each heated pipe in the heated pipe group is provided with an anti-abrasion device, and the anti-abrasion device is structurally characterized in that a plurality of half sleeves are flatly spread and covered on a flue gas washing surface of each heated pipe; at least one cover plate is arranged on each half sleeve, a supporting plate is correspondingly arranged on the heated pipe at each cover plate, and the left end and the right end of each supporting plate are fixedly connected to the left end and the right end of the corresponding cover plate respectively, so that the heated pipe is enclosed in an accommodating ring formed between the half sleeve and the corresponding supporting plate. The device can prevent high-temperature waste heat flue gas from directly scouring the heated pipe, so that coke particles and dust in the high-temperature waste heat flue gas are prevented from abrading the heated pipe, the service life of the heated pipe is prolonged, and the use cost is reduced. In addition, through matched connection of the half sleeves, the cover plates and the supports 6, free expansion allowance after heating is reserved for the half sleeves and the heated pipe.

Description

Technical Field

[0001] The utility model relates to a superheater in a coke dry quenching waste heat boiler, in particular to a superheater heated pipe protection device in the coke dry quenching waste heat boiler. Background Art

[0002] The CDQ waste heat boiler is connected to the flue gas outlet of the CDQ furnace, and the superheater is arranged at the uppermost end of the CDQ waste heat boiler. The high-temperature waste heat flue gas flowing out from the flue gas outlet of the CDQ furnace contains certain coke particles and dust. The coke particles and dust are directly washed on the heating tubes of the superheater in the CDQ waste heat boiler, which will damage the washed surface of the heating tubes. The coke from different coke ovens produces different coke particles and dust, especially the ramming coke oven has a higher content of coke particles and dust, which causes greater damage to the heating tubes of the superheater in the CDQ waste heat boiler, seriously affecting the service life of the heating tubes in the superheater and increasing the replacement frequency of the heating tubes. For the entire system, the increased replacement frequency of the heating tubes will also lead to an increase in the number of system starts and stops, cooling and heating times, and the economic losses caused by the shutdown of the boiler due to tube burst maintenance are also greatly increased. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to provide a superheater heated tube protection device in a dry coke quenching waste heat boiler for protecting the superheater heated tube, the device can prevent high-temperature waste heat flue gas from directly scouring the heated tube, thereby preventing coke particles and dust in the high-temperature waste heat flue gas from wearing the heated tube, thereby increasing the service life of the heated tube, and is also a protection for the entire system, without the need for frequent start-stop, cooling and heating, thereby greatly reducing the cost of use.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: the superheater heated tube protection device in the dry quenching waste heat boiler comprises: a heated tube group, each heated tube in the heated tube group is provided with an anti-wear device, the structure of the anti-wear device is: a plurality of half-tubes are flatly covered on the flue gas scouring surface of the heated tube, at least one cover plate is provided on each half-tube, and a supporting plate is correspondingly provided on the heated tube located at each cover plate, and the left and right ends of each supporting plate are respectively fixedly connected to the left and right ends of the corresponding cover plate, so that the heated tube is surrounded in a containing circle formed between the half-tube and the corresponding supporting plate.

[0005] Furthermore, in the aforementioned superheater heated tube protection device in the dry quenching waste heat boiler, three half-tubes made of stainless steel are flatly covered in sequence from front to back on the flue gas scouring surface of the heated tube.

[0006] Furthermore, in the aforementioned superheater heated tube protection device in the dry quenching waste heat boiler, the cover plate is integrally formed by a semicircular arc plate, a left connecting plate hanging down along the left end of the semicircular arc plate, and a right connecting plate hanging down along the right end of the semicircular arc plate to form an arch structure, a left accommodating groove is opened upward at the bottom of the left connecting plate, and a right accommodating groove is opened upward at the bottom of the right connecting plate; the support plate is a semicircular arc plate structure, and after the support plate extends between the left connecting plate and the right connecting plate of the corresponding cover plate, the left and right ends of the support plate are respectively fixedly connected to the inner side wall of the corresponding cover plate; a bottom plate is fixedly arranged on the support plate, and the bottom plate is embedded in the left accommodating groove and the right accommodating groove of the corresponding cover plate.

[0007] The heated tube group in the superheater is composed of a plurality of heated tubes and elbows connecting the heated tubes. The elbows are obtained by bending straight tubes. During the bending operation, the outer periphery of the elbow will be thinned due to bending and stretching, so the outer periphery strength of the elbow will be weakened. In order to protect the elbow part of the heated tube group, this scheme is designed as follows: a left protective cover is fixedly provided on the shell of the superheater, and the left protective cover covers the left elbow part of the heated tube group in the left protective cover; a right protective cover is fixedly provided on the shell of the superheater, and the right protective cover covers the right elbow part of the heated tube group in the right protective cover.

[0008] In order to enhance the connection strength between the shell and the left protective cover, at least one left support rod is provided between the shell and the left protective cover of the superheater. Similarly, in order to enhance the connection strength between the shell and the right protective cover, at least one right support rod is provided between the shell and the right protective cover of the superheater.

[0009] The beneficial effects of the utility model are: the device can prevent the high-temperature waste heat flue gas from directly scouring the heating pipe, thereby preventing the coke particles and dust in the high-temperature waste heat flue gas from wearing the heating pipe, prolonging the service life of the heating pipe, greatly reducing the economic losses caused by the shutdown of the boiler for maintenance due to pipe burst, and protecting the entire dry coke quenching system. In addition, through the coordinated connection of each half-tube, each cover plate, and each support plate, the heating pipe is left with a free expansion margin after heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model discloses a schematic structural diagram of a superheater heated pipe protection device in a dry coke quenching waste heat boiler.

[0011] Figure 2 yes Figure 1 Schematic diagram of the structure with anti-wear device installed on the medium heating tube.

[0012] Figure 3 yes Figure 2 Schematic diagram of the local enlarged structure of part A.

[0013] Figure 4 yes Figure 3 Schematic diagram of the partial structure of the anti-wear device on a single heated tube.

[0014] Figure 5 yes Figure 4 Schematic diagram of the structure in the BB section direction. DETAILED DESCRIPTION

[0015] The technical solution of the present utility model is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0016] For the convenience of description, this embodiment uses Figure 1 The direction shown on the left hand side is defined as "front", with Figure 1 The direction shown on the right hand side is defined as "rear", with Figure 5 The left-hand direction is defined as "right", with Figure 5 The right-hand direction is defined as "left", and all definitions of directions in this utility model are based on this.

[0017] The utility model is an improvement on the superheater currently available on the market. The superheater has a shell 1, a water inlet header and a water outlet header arranged outside the shell 1, and a heat receiving tube group 2 arranged inside the shell 1. The heat receiving tube group 2 is connected by a plurality of straight heat receiving tubes and a plurality of elbows to form a serpentine spiral structure. For the convenience of description, the straight heat receiving tube is directly defined as the heat receiving tube, and the elbow connection part is defined as the elbow part.

[0018] like Figure 2 As shown, the superheater heated tube protection device in the dry coke quenching waste heat boiler described in this embodiment includes: a heated tube group 2, and each heated tube 3 in the heated tube group 2 is provided with an anti-wear device, and the structure of the anti-wear device is: a plurality of half-tubes 4 are flatly covered on the flue gas scouring surface of the heated tube 3, and at least one cover plate 5 is provided on each half-tube 4, and a support plate 6 is correspondingly provided on the heated tube 3 located at each cover plate 5, and the left and right ends of each support plate 6 are respectively fixedly connected to the left and right ends of the corresponding cover plate 5, so that the heated tube 3 is surrounded in the containing circle formed between the half-tube 4 and the corresponding support plate 6. Such a connection method can also give the half-tube 4 an expansion margin.

[0019] More preferably, in this embodiment, three half-tubes 4 made of stainless steel are spread and covered in sequence from front to back on the flue gas flushing surface of the heat receiving tube 3 .

[0020] like Figure 3 , Figure 4 and Figure 5As shown, the cover plate 5 described in this embodiment is formed by a semicircular arc plate 51, a left connecting plate 52 hanging down along the left end of the semicircular arc plate 51, and a right connecting plate 53 hanging down along the right end of the semicircular arc plate 51, which are integrally formed to form an arch structure, and a left accommodating groove 521 is opened upward at the bottom of the left connecting plate 52, and a right accommodating groove is opened upward at the bottom of the right connecting plate 53; after the support plate 6 is extended between the left connecting plate 52 and the right connecting plate 53 of the corresponding cover plate 5, the left and right ends of the support plate 6 are respectively fixedly connected to the inner side wall of the corresponding cover plate 5; a bottom plate 7 is fixedly arranged on the support plate 6, and the bottom plate 7 is embedded in the left accommodating groove 521 and the right accommodating groove of the corresponding cover plate 5.

[0021] The heat receiving tube group 2 in the superheater is composed of a plurality of heat receiving tubes 3 and elbows connecting the heat receiving tubes 3. The elbows are obtained by bending straight tubes. During the bending operation, the outer periphery of the elbows will be thinned due to bending and stretching, so the outer periphery strength of the elbows will be weakened. In order to protect the elbow part of the heat receiving tube group, the present embodiment is designed as follows: Figure 1 As shown, a left protective cover 8 is fixedly provided on the shell 1 of the superheater, and the left protective cover 8 covers the left elbow part 21 of the heated tube group 2 in the left protective cover 8; a right protective cover 9 is fixedly provided on the shell 1 of the superheater, and the right protective cover 9 covers the right elbow part 22 of the heated tube group 2 in the right protective cover 9.

[0022] To enhance the connection strength between the housing 1 and the left protective cover 8, Figure 1 As shown, in this embodiment, at least one left support rod 81 is provided between the shell 1 of the superheater and the left protection cover 8. Similarly, in order to enhance the connection strength between the shell 1 and the right protection cover 9, at least one right support rod 91 is provided between the shell 1 of the superheater and the right protection cover 9.

[0023] The above device can protect each heat receiving tube 3, prevent the high temperature waste heat flue gas from directly scouring each heat receiving tube 3, thereby preventing the coke particles and dust in the high temperature waste heat flue gas from wearing each heat receiving tube 3, extending the service life of each heat receiving tube 3, and reducing the use cost. In addition, each half-tube 4, each cover plate 5, and each support plate 6 are fixedly connected, and the heat receiving tube 3 and each half-tube 4, each cover plate 5, and each support plate 6 are not fixed, so that the half-tube 4 and the heat receiving tube 3 can be left with a free expansion margin after heating.

[0024] The fixed connection between the half-sleeve 4, each cover plate 5, and each support plate 6 is usually welded. After the half-sleeve 4 is thinned under the long-term erosion of high-temperature waste heat flue gas, it is only necessary to grind the weld clean, remove the worn half-sleeve 4, and then replace it with a new half-sleeve 4. The anti-wear device is very convenient to replace.

[0025] The above description is only a preferred embodiment of the present invention and does not constitute any other limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. The superheater heat pipe protection device in the dry coke quenching waste heat boiler includes: A heated tube group, characterized in that: an anti-wear device is provided on each heated tube in the heated tube group, and the structure of the anti-wear device is as follows: a plurality of half-tubes are flatly covered on the flue gas scouring surface of the heated tube, at least one cover plate is provided on each half-tube, and a supporting plate is correspondingly provided on the heated tube located at each cover plate, and the left and right ends of each supporting plate are respectively fixedly connected to the left and right ends of the corresponding cover plate, so that the heated tube is enclosed in a containing circle formed between the half-tube and the corresponding supporting plate.

2. The superheater heated pipe protection device in the dry coke quenching waste heat boiler according to claim 1, characterized in that: Three half-tubes made of stainless steel are laid flat and covered in sequence from front to back on the flue gas flushing surface of the heating tube.

3. The superheater heated pipe protection device in the dry coke quenching waste heat boiler according to claim 1 or 2, characterized in that: The cover plate is integrally formed by a semicircular arc plate, a left connecting plate hanging down along the left end of the semicircular arc plate, and a right connecting plate hanging down along the right end of the semicircular arc plate to form an arch structure, a left accommodating groove is opened upward at the bottom of the left connecting plate, and a right accommodating groove is opened upward at the bottom of the right connecting plate; after the support plate extends between the left connecting plate and the right connecting plate of the corresponding cover plate, the left and right ends of the support plate are respectively fixedly connected to the inner side wall of the corresponding cover plate; a bottom plate is fixedly arranged on the support plate, and the bottom plate is embedded in the left accommodating groove and the right accommodating groove of the corresponding cover plate.

4. The superheater heated pipe protection device in the dry coke quenching waste heat boiler according to claim 1, characterized in that: A left protective cover is fixedly arranged on the shell of the superheater, and the left protective cover covers the left elbow part of the heated tube group in the left protective cover; a right protective cover is fixedly arranged on the shell of the superheater, and the right protective cover covers the right elbow part of the heated tube group in the right protective cover.

5. The superheater heated pipe protection device in the dry coke quenching waste heat boiler according to claim 4, characterized in that: At least one left support rod is arranged between the shell of the superheater and the left protection cover; at least one right support rod is arranged between the shell of the superheater and the right protection cover.

Images