Rear smoke box for boiler and boiler

Abstract

The utility model relates to the technical field of boiler equipment, and discloses a rear smoke box for a boiler and the boiler, the rear smoke box comprises a box body and a cylinder structure fixed in the box body, and an inner heat insulation layer is arranged on the inner surface of the box body; an anti-corrosion layer is arranged on the inner surface of the cylinder structure, a fireproof layer is laid on the outer side of the anti-corrosion layer, and a middle heat insulation layer is further arranged between the anti-corrosion layer and the fireproof layer. The beneficial effects are that the thermal insulation layer is arranged in the box body, so that the durability of the inner wall of the box body is improved; the anti-corrosion layer, the middle heat insulation layer and the fireproof layer are arranged in the cylinder structure, so that oxidation, corrosion and coking of the heating surface in the cylinder are prevented. And the service life of the base material in the rear smoke box of the boiler is greatly prolonged, so that the boiler achieves the effects of safety, energy conservation and corrosion resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler equipment, in particular to a rear smoke box for a boiler and a boiler. Background Art

[0002] A boiler is an energy conversion device that inputs chemical energy or electrical energy of fuel into the boiler and outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy through the boiler. The boiler consists of two parts: a pot and a furnace. The pot refers to a water container heated on fire, and the furnace refers to a place where fuel is burned. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator.

[0003] The rear smoke box is a structure on the boiler used to discharge waste heat and exhaust gas. In the prior art, high-temperature resistant materials such as high-temperature resistant concrete are often installed at the end of the rear smoke box to prevent damage from high-temperature flue gas. However, in the actual operation of the boiler, flue gas condensation often occurs to produce a large amount of condensed water, and the flue gas often contains corrosive substances. When a large amount of condensed water and flue gas containing corrosive substances come into contact with the metal surface of the rear smoke box, the metal surface is prone to irreversible low-temperature corrosion, thereby affecting the safety and durability of the structure.

[0004] In the patent literature, for example, the authorization announcement number is CN210014347U, and the name is a water-cooled rear smoke box for a boiler, including a rear smoke box cylinder, a refractory layer, a rear smoke box flange, a smoke box end cover, a fixing frame, a rear smoke box top plate, and a thermal insulation layer. It sets a water jacket interlayer between the rear smoke box cylinder and the smoke box end cover, and fills the water jacket interlayer with cooling water to cool the high temperature outside the rear smoke box cylinder. Although this technical solution is reasonable, it improves the dry rear smoke box into a water-cooled rear smoke box, which requires a large structural improvement and requires corresponding improvements to the boiler body, resulting in a high cost of transformation. Summary of the invention

[0005] In order to overcome the disadvantage of the prior art that the rear smoke box of the boiler is susceptible to high temperature corrosion, the utility model proposes a rear smoke box for the boiler and a boiler, and the detailed technical scheme is as follows:

[0006] A rear smoke box for a boiler comprises a box body and a cylindrical structure fixed inside the box body, wherein the inner surface of the box body is provided with an inner heat-insulating layer; the inner surface of the cylindrical structure is provided with an anti-corrosion layer, a fire-resistant layer is applied on the outer side of the anti-corrosion layer, and an intermediate heat-insulating layer is also provided between the anti-corrosion layer and the fire-resistant layer.

[0007] Furthermore, the anti-corrosion layer is a superconducting ceramic coating; the inner thermal insulation layer is an aerogel layer; the middle thermal insulation layer is aluminum silicate fiber felt; and the refractory layer is refractory concrete.

[0008] Furthermore, the rear smoke box also includes an upper panel, an inner panel, an explosion-proof device, a lower panel and a cylinder; the upper panel and the lower panel are snap-fitted and connected to the box on the outside of the box; the cylinder and the explosion-proof device are fixed to the inner lower end of the box; the cylindrical structure is located at the upper end of the cylinder.

[0009] Furthermore, the rear smoke box is also provided with an outer inspection door and an inner inspection door; the outer inspection door is hingedly connected to the upper panel; and the inner inspection door is bolted to the inner panel.

[0010] Furthermore, a chimney seat for installing a chimney is also provided on the top of the rear smoke box.

[0011] Furthermore, the periphery of the inner panel is welded to the inner wall of the box body, and is spaced apart from the upper panel; and the space between the inner panel and the upper panel is filled with heat insulating material.

[0012] Furthermore, the explosion-proof device includes a circular access hole insulation layer, stepped access hole insulation bricks, asbestos ropes between the access hole insulation layer and the access hole insulation bricks, inspection hole insulation bricks in the middle, and an explosion-proof door.

[0013] A boiler comprises a boiler body, on which the above-mentioned rear smoke box is arranged; a boiler tube plate is arranged in the boiler body; and the boiler tube plate is welded to the outer surface of the cylindrical structure.

[0014] The beneficial effects of the utility model are as follows: the utility model proposes a rear smoke box and a boiler for a boiler, which improves the durability of the inner wall of the box by arranging a heat insulation layer in the box; and prevents oxidation, corrosion and coking of the heating surface inside the cylinder by arranging an anti-corrosion layer, an intermediate heat insulation layer and a refractory layer inside the cylindrical structure. The service life of the base material inside the rear smoke box of the boiler is greatly improved, so that the boiler achieves the effects of safety, energy saving and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the rear cigarette box of the utility model.

[0016] Figure 2 It is a cross-sectional view of the rear smoke box of the utility model.

[0017] Figure 3 It is a structural schematic diagram of the cylinder of the utility model.

[0018] Figure 4 It is a structural schematic diagram of the explosion-proof device of the utility model.

[0019] in:

[0020] 100—upper panel; 200—inner panel; 300—box; 400—cylindrical structure; 500—boiler tube sheet

[0021] 600—explosion-proof device; 700—lower panel; 800—cylinder

[0022] 110—External inspection door; 120—Internal inspection door; 130—Chimney seat;

[0023] 310—Inner insulation layer;

[0024] 410—anti-corrosion layer; 420—intermediate insulation layer; 430—refractory layer;

[0025] 610—insulation layer of entry hole; 620—asbestos rope; 630—insulation brick of entry and exit hole; 640—insulation brick of inspection hole; 650—explosion-proof door. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] A rear smoke box for a boiler, the structure is as follows Figure 1 and Figure 2 As shown, it includes an upper panel 100, an inner panel 200, a box body 300, a cylinder body 800, an explosion-proof device 600 and a lower panel 700. The upper panel 100 and the lower panel 700 are buckled together to form an outer panel and are located outside the box body 300. The cylinder body 800 is fixed to the lower end of the inner part of the box body 300, and the explosion-proof device 600 is located at the lower end of the inner part of the box body 300. A cylindrical structure 400 is also fixedly connected above the cylinder body 800.

[0028] like Figure 1 As shown, the rear smoke box is also provided with an outer inspection door 110 and an inner inspection door 120, wherein the outer inspection door 110 is hingedly connected to the outer panel, and the inner inspection door 120 is bolted to the inner panel 200. A chimney seat 130 for chimney installation is also provided on the top of the rear smoke box. The upper panel 100 and the lower panel 700 are both arc-shaped steel plates, and the upper panel 100 is connected to the box body 300 on all sides, and one side is connected to the outer inspection door 110. One side of the lower panel 700 is connected to the cylinder 800, and one side is connected to the explosion-proof device 600. The outer inspection door 110 and the inner inspection door 120 can be made of arc-shaped steel plates, strip steel plates, fire-resistant heat-insulating materials and heat-insulating materials.

[0029] To prevent the boiler rear smoke box from being corroded by high temperature in a long-term high temperature environment, Figure 1 As shown, an inner heat insulation layer 310 is provided on the inner surface of the box body 300. Figure 3 As shown, an anti-corrosion layer 410 is provided on the inner surface of the cylindrical structure 400, a refractory layer 430 is laid on the outer side of the anti-corrosion layer 410, and an intermediate heat-insulating layer 420 is further provided between the anti-corrosion layer 410 and the refractory layer 430. The anti-corrosion layer 410 is a superconducting ceramic coating, the inner heat-insulating layer 310 can be an aerogel layer, the intermediate heat-insulating layer 420 can be an aluminum silicate fiber felt, and the refractory layer 420 is refractory concrete. The inner heat-insulating layer 310 is provided on the inner surface of the box body 300 to prevent the high-temperature flue gas from directly contacting the inner wall of the box body. The inner surface of the cylindrical structure 400 is a metal substrate heating surface, which is a corrosion-prone surface. By providing the anti-corrosion layer 410, the intermediate heat-insulating layer 420 and the refractory layer 420, the high-temperature durability of the cylindrical structure 400 is further improved, and the service life of the rear smoke box is improved.

[0030] To prevent the temperature of the rear smoke box from being directly transferred to the outer panel, Figure 3 As shown, the inner panel 200 is welded to the box body 300 on all sides, and the other side is spaced apart from the upper panel 100. A heat insulating material is filled between the upper panel 100 and the inner panel 200. The heat insulating material can be aluminum silicate fiber felt or aerogel.

[0031] In order to prevent the rear smoke box from causing disasters due to high temperature or improper operation, an explosion-proof device 600 is also provided at the bottom of the rear smoke box. The structure of the explosion-proof device 600 is as follows: Figure 4 As shown, it includes an annularly arranged access hole insulation layer 610, a stepped access hole insulation brick 630, an asbestos rope 620 between the access hole insulation layer 610 and the access hole insulation brick 630, an inspection hole insulation brick 640 located in the middle, and an explosion-proof door 650 located on the lower panel 700. When deflagration or explosion occurs in the boiler furnace, the explosion-proof door will automatically open to achieve the effect of pressure relief. The principle is that when the boiler furnace pressure exceeds the design value, the explosion-proof door, under the action of the internal pressure, transmits the force to the explosion-proof door cover through the connecting rod in the explosion-proof door, and the cover pushes the explosion-proof door spring to be compressed, so that the explosion-proof door opens to relieve pressure.

[0032] A boiler comprises a boiler body, on which the above-mentioned rear smoke box is arranged; Figure 3 As shown, a boiler tube sheet 500 is arranged inside the boiler body; the boiler tube sheet 500 is welded to the outer surface of the cylindrical structure 400 of the rear smoke box.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rear smoke box for a boiler, comprising a box body and a cylindrical structure fixed inside the box body, characterized in that: The inner surface of the box body is provided with an inner insulation layer; the inner surface of the cylindrical structure is provided with an anti-corrosion layer, the outer side of the anti-corrosion layer is provided with a fire-resistant layer, and an intermediate insulation layer is also provided between the anti-corrosion layer and the fire-resistant layer.

2. The rear smoke box according to claim 1, characterized in that: The anti-corrosion layer is a superconducting ceramic coating; the inner heat-insulating layer is an aerogel layer; the middle heat-insulating layer is aluminum silicate fiber felt; and the refractory layer is refractory concrete.

3. The rear smoke box according to claim 1, characterized in that: The rear smoke box also includes an upper panel, an inner panel, an explosion-proof device, a lower panel and a cylinder; the upper panel and the lower panel are snap-fitted and connected to the box on the outside of the box; the cylinder and the explosion-proof device are fixed to the lower end of the interior of the box; the cylindrical structure is located at the upper end of the cylinder.

4. The rear smoke box according to claim 3, characterized in that: The rear smoke box is also provided with an outer inspection door and an inner inspection door; the outer inspection door is hingedly connected to the upper panel; the inner inspection door is bolted to the inner panel.

5. The rear smoke box according to claim 4, characterized in that: A chimney seat for installing a chimney is also provided on the top of the rear smoke box.

6. The rear smoke box according to claim 3, characterized in that: The periphery of the inner panel is welded to the inner wall of the box body and is spaced apart from the upper panel; the space between the inner panel and the upper panel is filled with heat insulating material.

7. The rear smoke box according to claim 3, characterized in that: The explosion-proof device includes an annular access hole insulation layer, stepped access hole insulation bricks, asbestos ropes between the access hole insulation layer and the access hole insulation bricks, inspection hole insulation bricks in the middle, and an explosion-proof door.

8. A boiler, comprising a boiler body, characterized in that: The boiler body is provided with a rear smoke box as claimed in any one of claims 1 to 7; the boiler body is provided with a boiler tube sheet; the boiler tube sheet is welded to the outer surface of the cylindrical structure.

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