Hot air pipeline expansion joint

Abstract

The utility model discloses a hot air pipeline expansion joint, which is characterized in that a corrugated pipe of the expansion joint adopts a heat insulation layer consisting of high-temperature-resistant and high-strength ceramic fiber folding blocks to prevent hot air from contacting with the corrugated pipe, and adopts an anti-scouring and high-temperature-resistant silicon-containing hardening agent to be sprayed on the surface of the heat insulation layer. The heat insulation layer replaces original ceramic fiber cotton and can stretch out and draw back along with the expansion joint, so that the corrugated pipe is thoroughly isolated from hot air, and the hardened layer protects the heat insulation layer from being scoured by high-temperature air flow.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the carbon black industry technical field, concretely relates to the pipeline expansion joint of high temperature air preheater (hereinafter referred to as: preheater) high temperature air outlet and combustor vertical direction connection. BACKGROUND

[0002] The preheater on the carbon black production line heats the cold air, and the heated air enters the hot air pipeline from the hot air outlet and returns to the combustion-supporting combustor of the reaction furnace to achieve the purpose of energy saving. The air temperature of the currently used preheater has reached 950 DEG C. The outlet of the reaction furnace is connected with the base of the preheater and is parallel to the hot air pipeline. The hot air enters the combustor vertically downward through the elbow pipe. The vertical section of the pipeline is provided with a pipeline expansion joint. The shell of the hot air pipeline is provided with a heat preservation layer and a refractory layer. The ceramic fiber cotton and stainless steel baffle in the bellows of the pipeline expansion joint form a heat insulation layer. Before installation, the expansion joint is in a pre-pressed state. The existing problems are as follows: 1. The bellows of the expansion joint is filled with ceramic fiber cotton, which has small compression amount, many waves, long bellows, and poor stability of the pipeline expansion joint; 2. At high temperature, the ceramic fiber cotton in the bellows of the expansion joint becomes more and more loose, the heat preservation effect is poor, the strength of the bellows is reduced or the bellows is burned through; 3. At high temperature, the stainless steel baffle is severely deformed, the ceramic fiber cotton leaks out of the expansion gap of the baffle, enters the hot air flow, and then enters the combustor, blocking the gas inlet of the combustor; 4. After the hot air containing ceramic fiber cotton enters the reaction furnace, the carbon black tail gas contains impurities, and the produced carbon black is of poor quality or unqualified; 5. The bellows and the cylinder are connected by lap welding, the heat insulation layer of the bellows has poor effect, and the welding seam is easy to crack. Therefore, the heat insulation of the bellows is very important, which directly affects the service life of the expansion joint. The current heat insulation method has poor effect and high damage rate of the bellows. Our company has developed a bellows heat insulation layer technology, which can effectively isolate the adverse effects of hot air on the bellows, ensure that impurities are not mixed into the hot air, and solve the problem of welding seam cracking by using butt welding between the bellows and the connecting cylinder. SUMMARY

[0003] The utility model develops a kind of hot air pipeline expansion joint, the heat insulation layer of the bellows of this expansion joint is made of high-temperature-resistant, high-strength ceramic fiber folding block, which prevents hot air from contacting the bellows, and the heat insulation layer is sprayed with silicon-containing hardener that is resistant to erosion and high temperature on its surface. The heat insulation layer replaces the original ceramic fiber cotton and can expand and contract with the expansion joint, so that the bellows and hot air are completely isolated, and the hardening layer protects the heat insulation layer from the erosion of high-temperature air flow.

[0004] The utility model discloses a hot air pipeline expansion joint, include: support board, rain cover, draw bar, flange cylinder, fixed pin, bellows, middle cylinder, connecting pin, heat insulating block I, heat insulating block II, insulating layer, refractory layer, baffle, hardening agent, its characterized in that: pipeline expansion joint is mainly by upper and lower flange cylinder, middle cylinder and bellows and is composed, and there is baffle at mutual connection department, the insulating layer of flange cylinder and middle cylinder is composed by insulating layer and refractory layer, the insulating layer of bellows is composed by concave heat insulating ring and convex heat insulating ring upper and lower cooperation, and the surface is sprayed hardening agent, the concave heat insulating ring is worn together by connecting pin by a plurality of heat insulating blocks II, the convex heat insulating ring is worn together by connecting pin by a plurality of heat insulating blocks I, heat insulating block I is convex ceramic fiber stack, heat insulating block II is concave ceramic fiber folding block, the insulating layer of bellows is fixed on the connected cylinder with fixed pin after butt joint, and the both ends adopt butt welding connection with flange cylinder and middle cylinder, the rain cover is welded on the shell of upper flange cylinder and middle cylinder, is located above bellows, the support board is welded on flange cylinder and middle cylinder, and the pipeline expansion joint is adjusted and fixed through draw bar.

[0005] The design points of the utility model are:

[0006] The insulating layer is not affected by the expansion and contraction of the bellows, and the welding strength of the connection between the bellows and the cylinder is strengthened.

[0007] The utility model has the advantages of:

[0008] 1. The ceramic fiber folding block insulating layer solves the problem of strength reduction and deformation of the bellows after being subjected to high temperature, reduces the number of corrugations, and increases the overall stability of the pipeline expansion joint.

[0009] 2. After the strength of the bellows is improved, the welding strength with the cylinder is improved, and the hidden danger of weld cracking is eliminated.

[0010] 3. The service life of the pipeline expansion joint is improved, the maintenance frequency is reduced, and the production cost is reduced. DRAWINGS

[0011] Figure 1 The utility model schematic diagram

[0012] Figure 2 The utility model Figure 1 I enlarged view

[0013] Figure 3 The utility model Figure 1 A-A cross section schematic diagram mark in the drawing: 1-support board, 2-rain cover, 3-draw bar, 4-flange cylinder, 5-fixed pin, 6-bellows, 7-middle cylinder, 8-connecting pin, 9-heat insulating block I, 10-heat insulating block II, 11-insulating layer, 12-refractory layer, 13-baffle, yh-hardening agent. DETAILED DESCRIPTION

[0014] A hot air pipeline expansion joint, comprising: a support plate 1, a rain cover 2, a pull rod 3, a flange cylinder 4, a fixing pin 5, a bellows 6, an intermediate cylinder 7, a connecting pin 8, a heat insulation block I 9, a heat insulation block II 10, an insulation layer 11, a refractory layer 12, a blocking plate 13, and a hardening agent yh.

[0015] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model will be described in further detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0016] Specific implementation process:

[0017] 1. Make the outer shell of the upper and lower flange cylinders 4 and the intermediate cylinder 7 and weld anchor nails, process the step at the connection between the cylinder and the bellows 6, drill holes at the fixing pin 5 installation position of the cylinder, install the insulation layer 11, and make the refractory layer 12;

[0018] 2. Make the support plate 1, the rain cover 2, the pull rod 3, and the blocking plate 13;

[0019] 3. The bellows 6, the heat insulation block I 9, and the heat insulation block II 10 are outsourced, the hardening agent yh and the nut are purchased;

[0020] 4. A plurality of heat insulation blocks I 9 are connected together by the connecting pin 8 to form a convex heat insulation ring, and a plurality of heat insulation blocks II 10 are connected together to form a concave heat insulation ring;

[0021] 5. The concave and convex heat insulation rings are respectively installed on the blocking plate 13 of the flange cylinder 4 and the intermediate cylinder 7 according to the indicated positions, and are fixed by the fixing pin 5 and then welded on the cylinder, and the hardening agent yh is sprayed on the surface of the heat insulation layer;

[0022] 6. The flange cylinder 4 and the intermediate cylinder 7 are connected through the bellows 6, and the concave and convex heat insulation rings should be matched together;

[0023] 7. After the expansion joint composed of the flange cylinder 4, the intermediate cylinder 7, and the bellows 6 is aligned, the two ends of the bellows 6 and the connected cylinder steps are welded;

[0024] 8. The support plate 1 and the rain cover 2 are welded;

[0025] 9. The pull rod 3 passes through the three support plates 1, and the nut is used to adjust the bellows 6 to be in a pre-pressed state and is fixed by a locking nut;

[0026] 10. Factory inspection, packaging, and delivery.

[0027] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hot air duct expansion joint comprising: The utility model provides a pipeline expansion joint, which comprises a support plate (1), a rain cover (2), a pull rod (3), a flange cylinder (4), a fixing pin (5), a bellows (6), an intermediate cylinder (7), a connecting pin (8), a heat insulation block I (9), a heat insulation block II (10), a heat preservation layer (11), a fireproof layer (12), a blocking plate (13) and a hardening agent (yh), characterized in that: the pipeline expansion joint is mainly composed of upper and lower flange cylinders (4), an intermediate cylinder (7) and a bellows (6), and the blocking plate (13) is arranged at the connecting position; the heat insulation layer of the flange cylinder (4) and the intermediate cylinder (7) is composed of the heat preservation layer (11) and the fireproof layer (12); the heat insulation layer of the bellows (6) is composed of a concave heat insulation ring and a convex heat insulation ring matched in an upper-lower mode, and the surface is sprayed with the hardening agent (yh); the concave heat insulation ring is composed of a plurality of heat insulation block IIs (10) which are penetrated together through the connecting pin (8); the convex heat insulation ring is composed of a plurality of heat insulation blocks I (9) which are penetrated together through the connecting pin (8); the heat insulation layer of the bellows (6) is fixed on the connected cylinder by the fixing pin (5) after being butted against the blocking plate (13), and the two ends are connected to the flange cylinder (4) and the intermediate cylinder (7) through butt welding; the rain cover (2) is welded on the shell of the upper flange cylinder (4) and the intermediate cylinder (7) and is located above the bellows (6); the flange cylinder (4) and the intermediate cylinder (7) are welded with the support plate (1), and the pipeline expansion joint is adjusted and fixed through the pull rod (3).

2. A hot air pipe expansion joint according to claim 1, characterized in that: The heat insulation block I (9) is a convex ceramic fiber stack; and the heat insulation block II (10) is a concave ceramic fiber folding block.

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