Internal protective layer of high-temperature air pipeline

Abstract

The invention discloses an internal protective layer of a high-temperature air pipeline, which is innovated and recombined to thoroughly change the traditional thermal insulation layer and refractory layer. A ceramic fiber folding block which has high compressive strength and flexural strength, can keep good structural stability in a high-temperature environment and can bear certain scouring is adopted to replace an original heat preservation layer. A colloidal silicon-containing hardening agent is adopted to replace an original refractory layer, so that the surface of the ceramic fiber folding block exposed to high-temperature air flow is protected from being scoured; according to the technical scheme, the weight of the air pipeline is greatly reduced, great convenience is brought to field installation, vibration is avoided in the hoisting process, a refractory material maintenance link is omitted, the field construction period is shortened, large-tonnage hoisting equipment does not need to be arranged, and a large amount of cost is saved for enterprises and users.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon black industry, and specifically relates to an internal protective layer of a pipeline connected to a high-temperature air outlet of an air preheater. Background Art

[0002] The hot air duct connected to the hot air outlet of the air preheater on the carbon black production line includes a straight duct, a curved duct and a duct expansion joint. The shells of the straight duct and the curved duct have a protective layer composed of an insulation layer, a heat preservation layer and a refractory layer. The insulation layer is made of fiber felt, the insulation layer is cast with refractory materials, and the refractory layer is built with refractory bricks. The existing problems are: the protective layer composed of castables and refractory bricks increases the weight of the pipeline by more than 60%, and it is easy to break and fall off during the hoisting process. Although refractory materials and refractory bricks are made at the production site, there are still problems of being squeezed and broken or cracked during the hoisting and adjustment process. At the same time, large-tonnage hoisting equipment and operating platforms are required for the making and maintenance of refractory materials. There are also many on-site operators, and the installation is difficult and the cycle is long. Once the cracks in the refractory materials expand during the transportation of high-temperature air, the high-temperature air will contact the fiber felt and blow it away and burn through the shell. Summary of the invention

[0003] The present invention introduces an internal protective layer for a high-temperature air duct, innovatively reorganizes the internal protective layer of the air duct, and completely changes the traditional thermal insulation layer and refractory layer. A ceramic fiber folding block with high compressive and flexural strength, which can maintain good structural stability in a high-temperature environment and withstand a certain amount of scouring is used to replace the original thermal insulation layer; a colloidal silicon-containing hardener is used to replace the original refractory layer to protect the surface of the ceramic fiber folding block exposed to the high-temperature air flow from scouring; this technical solution not only greatly reduces the weight of the air duct, but also brings great convenience to on-site installation. The hoisting process is not afraid of vibration, there is no refractory material maintenance link, the on-site construction period is shortened, and there is no need to be equipped with large-tonnage hoisting equipment, which saves a lot of costs for enterprises and users.

[0004] The technical solution of the present invention is as follows: an internal protective layer of a high-temperature air duct, comprising: a straight pipe, a heat insulation layer, a heat preservation layer, a temperature-resistant layer, a fiberboard, a movable support, a bend pipe, a burner, a reactor, and an air preheater, and also comprising: a cold air inlet, a hot air outlet, a temperature measuring port, and a pressure measuring port, characterized in that: air enters the air preheater from the cold air inlet, exchanges heat with the high-temperature flue gas, becomes high-temperature air, and then flows out from the hot air outlet, passes through the high-temperature air duct and enters the burner on the reactor for combustion assistance; the high-temperature air duct is composed of a straight pipe, a bend pipe and a pipeline expansion joint; a movable support is provided at the bottom of the straight pipe, which is connected to the hot air outlet through the pipeline expansion joint; the bend pipe is connected to the burner through the pipeline expansion joint; the straight pipe and the bend pipe have three layers of protection inside, namely, a heat insulation layer, a heat preservation layer and a temperature-resistant layer; the heat insulation layer is a fiber felt; the heat preservation layer is a ceramic fiber folded block; the temperature-resistant layer is a silicon-containing hardener; a temperature measuring port and a pressure measuring port are provided on the straight pipe and the bend pipe connected to the expansion joint; and each section of the high-temperature air duct is sealed with a fiberboard. After the high-temperature air duct adopted a new internal protective layer, the weight of the high-temperature air duct was greatly reduced, the hidden danger of the shell being burned due to refractory material breaking was solved, the difficulties arising from the installation and construction process were solved, the installation cycle was shortened, and the pipeline manufacturing and installation costs and the labor intensity of operators were reduced.

[0005] The design points of the present invention are:

[0006] 1. Reduce the weight of the air duct, change the structure and material of the internal protective layer of the duct, and shorten the on-site operation cycle;

[0007] 2. There is no need to make refractory materials and lay refractory bricks on site, which reduces the labor intensity and construction difficulty of operators;

[0008] The beneficial effects of the present invention are:

[0009] 1. It reduces the weight of the high-temperature air duct and eliminates the construction difficulty caused by on-site refractory manufacturing;

[0010] Second, it is convenient to install, reduces site rental fees, and eliminates the hidden danger of refractory materials breaking during the hoisting process;

[0011] 3. It saves a lot of manpower and the rental of large-tonnage lifting equipment, improves production efficiency and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Position diagram of the present invention

[0013] Figure 2 The present invention Figure 1 Ⅰ Enlarged image

[0014] Figure 3 The present invention Figure 2Markings in the AA section schematic diagram: 1.0-straight pipe, 1.1-insulation layer, 1.2-insulation layer, 1.3-heat-resistant layer, 1.4 fiberboard, 2.0-movable support, 3.0-elbow pipe, 4.0-burner, 5.0-reactor, 6.0-air preheater, d-cold air inlet, c-hot air outlet, h-temperature measuring port, p-pressure measuring port. DETAILED DESCRIPTION

[0015] An internal protective layer of a high-temperature air duct, comprising: a straight pipe 1.0, a heat insulating layer 1.1, a heat preservation layer 1.2, a temperature resistant layer 1.3, a fiberboard 1.4, a movable support 2.0, a bent pipe 3.0, a burner 4.0, a reaction furnace 5.0, an air preheater 6.0, a cold air inlet d, a hot air outlet c, a temperature measuring port h, and a pressure measuring port p.

[0016] Specific implementation process:

[0017] ① The straight pipe 1.0 and elbow 3.0 shells of the air duct are manufactured and the anchor nails are welded in the factory;

[0018] ② After all air ducts are transported to the site, a fiber felt insulation layer 1.1 is laid inside the shells of the straight pipe 1.0 and the curved pipe 3.0;

[0019] ③ Install the ceramic fiber folded block insulation layer 1.2 on the insulation layer 1.1;

[0020] ④ Spraying a silicon-containing hardener on the surface of the ceramic fiber folding block insulation layer 1.2 to form a heat-resistant layer 1.3;

[0021] ⑤ The movable support 2.0 of each straight pipe 1.0 is installed on the on-site frame, and then the bent pipe 3.0 is installed;

[0022] ⑥ Each section of the pipeline is sealed with fiberboard 1.4 and bolted together;

[0023] ⑦ Check whether the sealing parts, dimensions and appearance meet the requirements. If qualified, tighten the fasteners again as required.

Claims

1. An internal protective layer of a high-temperature air duct, comprising: A straight pipe (1.0), a heat insulating layer (1.1), a heat-insulating layer (1.2), a heat-resistant layer (1.3), a fiberboard (1.4), a movable support (2.0), a bent pipe (3.0), a burner (4.0), a reaction furnace (5.0), and an air preheater (6.0), and further comprising: a cold air inlet (d), a hot air outlet (c), a temperature measuring port (h), and a pressure measuring port (p), characterized in that: air enters the air preheater (6.0) from the cold air inlet (a), exchanges heat with the high-temperature flue gas, becomes high-temperature air, and then flows out from the hot air outlet (c), passes through the high-temperature air duct, and enters the burner (4.0) at the head of the reaction furnace (5.0) to assist combustion; the high The hot air duct is composed of a straight pipe (1.0), a curved pipe (3.0) and a pipe expansion joint; the straight pipe (1.0) has a movable support (2.0) at the bottom, which is connected to a hot air outlet (c) through a pipe expansion joint; the curved pipe (3.0) is connected to a burner (4.0) through a pipe expansion joint; the straight pipe (1.0) and the curved pipe (3.0) have three layers of protection inside, namely a heat insulation layer (1.1), a heat preservation layer (1.2) and a temperature resistant layer (1.3); the straight pipe (1.0) and the curved pipe (3.0) connected to the expansion joint are provided with a temperature measuring port (h) and a pressure measuring port (p); and fiberboard (1.4) is used to seal each section of the hot air duct.

2. The internal protective layer of a high-temperature air duct according to claim 1, characterized in that: The heat insulating layer (1.1) is a fiber felt; the thermal insulation layer (1.2) is a ceramic fiber folded block; and the temperature resistant layer (1.3) is a silicon-containing hardener.

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