SZL boiler water-cooled screen wall structure

Abstract

The utility model discloses a SZL boiler water -cooling screen furnace wall structure, including by front wall water cooling wall, rear wall water cooling wall, side wall water cooling wall constitute's water cooling wall group and constitute water cooling screen group by a plurality of water cooling screen pipes, water cooling screen pipe correspond to the extension in water cooling wall group, and the outside of water cooling screen pipe is covered with refractory concrete. Water cooling screen pipe is provided with a row from top to bottom and is parallel arrangement, and after obliquely passing through front wall water cooling wall, it is bent and extends upwards. In the device, the refractory concrete is cast on the water cooling screen pipe, which can effectively prevent the abrasion and scouring of flue gas on the water cooling screen pipe, effectively improve the service life of the water cooling screen pipe and the stable operation of the boiler. In the device, the refractory concrete is cast on the two water cooling screen pipes in the lowermost layer. The two refractory concretes in the lowermost layer are most seriously scoured by flue gas. On the one hand, the two water cooling screen pipes that are most seriously scoured can be protected. On the other hand, the influence on the furnace cooling can be reduced, and the furnace cooling effect is not affected.

Description

Technical Field

[0001] This utility model relates to the field of SZL boiler technology in boiler equipment, specifically to a water-cooled furnace wall structure for an SZL boiler. Background Technology

[0002] In the current technology, with the increasing severity of environmental pollution and the growing scarcity of energy, people hope to achieve energy conservation and emission reduction by improving combustion conditions and combustion methods. The formation of NOx is closely related to temperature. Generally, the higher the flame temperature, the more NOx is formed. Currently, in the SZL furnace type, a suspended water-cooled screen is installed inside the furnace area to increase the furnace radiant heating area, enhance the furnace cooling effect, reduce the furnace temperature, and reduce the formation of thermal NOx, thereby achieving the purpose of low-NOx combustion.

[0003] There are many types of boiler water-cooled screens in the prior art. For example, the "A Boiler Water-Cooled Screen Device" disclosed in Publication No. CN219389686U and the "Anti-Deformation Water-Cooled Screen for a Circulating Fluidized Bed Boiler" disclosed in Publication No. CN207539894U both include water-cooled screens.

[0004] like Figure 1 As shown, this is a common water-cooled screen structure in the prior art. The entire water-cooled screen device is located inside the furnace. When the flue gas in the furnace flows upward, it will wash over the water-cooled screen tubes located on the lower side, which will cause significant wear to the water-cooled screen tubes on the lower side, which is very detrimental to the long-term stable operation of the boiler.

[0005] Therefore, in order to solve the above problems, it is necessary to develop a SZL boiler water-cooled screen furnace wall structure with a reasonable structure, which can increase the service life of water-cooled screen tubes and improve the long-term stable operation of the boiler. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by providing a water-cooled furnace wall structure for SZL boilers; the technical solution is as follows:

[0007] A water-cooled screen furnace wall structure for an SZL boiler includes a water-cooled wall assembly consisting of a front water-cooled wall, a rear water-cooled wall, and a side water-cooled wall, as well as a water-cooled screen assembly consisting of several water-cooled screen tubes.

[0008] The water-cooled screen tube extends into the water-cooled wall assembly, and the outside of the water-cooled screen tube is covered with refractory concrete.

[0009] Furthermore, the water-cooled screen tubes are arranged in a row from top to bottom in parallel, and then bend upwards after passing obliquely through the front wall water-cooled wall.

[0010] Furthermore, the two lowest water-cooled tubes are covered with refractory concrete; since the two lowest water-cooled tubes are subjected to the most severe erosion, the two lowest water-cooled tubes are selected to be cast with refractory concrete.

[0011] Furthermore, one end of the refractory concrete extends to the front water-cooled wall, and the other end extends to the bend of the water-cooled screen tube.

[0012] Furthermore, the two lowest tubes of the water-cooled screen tube are provided with several sets of evenly spaced pins, and the refractory concrete covers the pins.

[0013] Furthermore, the pin is fixed to the water-cooled screen tube by welding; the welding method provides a more secure fixation.

[0014] Furthermore, the distance between two adjacent sets of pins on the same water-cooled screen tube is set to 50mm; setting the distance between the pins reasonably can reduce the difficulty of pouring refractory concrete.

[0015] Furthermore, each group of pins on the water-cooled screen tube is provided with five pins. The angle between adjacent pins in the same group is not uniform, and the positions of adjacent groups of pins are different.

[0016] Furthermore, the angles between adjacent pins in the same group of five pins are set to 60°, 60°, 60°, 60° and 120° respectively.

[0017] Beneficial effects: This utility model has the following beneficial effects:

[0018] 1) In this device, refractory concrete is poured on the water-cooled screen tube, which can effectively prevent the flue gas from wearing and eroding the water-cooled screen tube, effectively improving the service life of the water-cooled screen tube and the stable operation of the boiler.

[0019] 2) In this device, refractory concrete is poured on the two bottom water-cooled screen tubes. The two bottom water-cooled screen tubes are most severely eroded by flue gas. On the one hand, this can protect the two water-cooled screen tubes that are most severely eroded; on the other hand, it can reduce the impact on furnace cooling and not affect the furnace cooling effect.

[0020] 3) In this device, the refractory concrete is poured on the water-cooled screen tubes and poured to the front wall water-cooled wall and the bends of the water-cooled screen tubes, which can effectively reduce the impact on furnace cooling.

[0021] 4) In this device, fixing pins are also welded onto the water-cooled screen tubes. The pins can effectively improve the stability of the poured refractory concrete, making the poured refractory concrete more solid and stable. Attached Figure Description

[0022] Figure 1 Diagram of existing technology structure;

[0023] Figure 2 This is a structural diagram of the present utility model;

[0024] Figure 3 This is a vertical cross-sectional view of the refractory concrete in this utility model;

[0025] Figure 4 This is a vertical cross-sectional view of the water-cooled screen tube in this utility model;

[0026] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0027] Figure 6 for Figure 4 Cross-sectional view of the middle section (BB);

[0028] Among them, the front wall water-cooled wall 1, the rear wall water-cooled wall 2, the side wall water-cooled wall 3, the water-cooled screen tube 4, the pin 5, and the refractory concrete 6. Detailed Implementation

[0029] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. These embodiments are implemented under the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0030] like Figure 2 As shown, an SZL boiler water-cooled screen furnace wall structure includes a water-cooled wall group consisting of a front wall water-cooled wall 1, a rear wall water-cooled wall 2, and a side wall water-cooled wall 3, and a water-cooled screen group consisting of several water-cooled screen tubes 4.

[0031] The water-cooled screen tube 4 extends into the water-cooled wall assembly, and the outside of the water-cooled screen tube 4 is covered with refractory concrete 6; the water-cooled screen tube 4 is arranged in a row from top to bottom and is arranged in parallel, and then bends upward after passing through the front wall water-cooled wall 1 at an angle.

[0032] like Figure 3 As shown, the two lowest tubes of the water-cooled screen tube 4 are covered with refractory concrete 6; one end of the refractory concrete 6 extends to the front water-cooled wall 1, and the other end extends to the bend of the water-cooled screen tube 4.

[0033] like Figure 4 As shown, the two lowest tubes of the water-cooled screen tube 4 are also provided with several sets of evenly spaced pins 5, and the refractory concrete 6 covers the pins 5 inside; the pins 5 are fixed to the water-cooled screen tube 4 by welding.

[0034] like Figure 5 and Figure 6As shown, the distance between two adjacent sets of pins 5 on the same water-cooled screen tube 4 is set to 50mm; each set of pins 5 on the water-cooled screen tube 4 is provided with five pins, and the angle between adjacent pins 5 in the same set is not uniformly set, and the positions of two adjacent sets of pins 5 are different.

[0035] The angles between adjacent pins 5 in the same group are set to 60°, 60°, 60°, 60° and 120° respectively.

[0036] The main technical solution of this device is to cover the water-cooled screen tubes 4 with refractory concrete 6. The refractory concrete 6 can effectively prevent the flue gas from eroding and wearing the water-cooled screen tubes 4, increasing the service life of the water-cooled screen tubes 4 and increasing the operational stability of the boiler. In addition, the technical solution of this device can cover all the water-cooled screen tubes 4 with refractory concrete 6. However, such a structure will affect the cooling effect of the water-cooled screen in the furnace. Therefore, the technical solution of this device chooses to cover the outside of the two water-cooled screen tubes 4 located at the bottom layer with refractory concrete 6. The two water-cooled screen tubes at the bottom layer are most severely eroded by the flue gas, so this can effectively reduce erosion and wear, and will not have a significant impact on the cooling of the furnace.

[0037] In this device, the refractory concrete 6 is specifically poured to the front wall water-cooled wall 1 on the front side and to the bend of the water-cooled screen tube 4 on the rear side. In addition, in order to increase the overall stability of the refractory concrete 6, pins 5 are also installed on the water-cooled screen tube 4 in this device.

[0038] First, the pin 5 is welded and fixed to the water-cooled screen tube 4. After the welding is completed, the water-cooled screen tube 4 needs to undergo a water pressure test to ensure that there are no leaks at the weld. Then, refractory concrete 6 is poured accordingly. Due to the presence of the external pin 5 and the poured refractory concrete 6, it can be more firmly wrapped around the water-cooled screen tube 4, making the structure more stable and reliable.

[0039] Furthermore, the technical solution of this device also details the specific installation position and structure of the pins 5 on the water-cooled screen tube 4. Firstly, the pins 5 on the water-cooled screen tube 4 are arranged in several groups with equal intervals, each group having five pins 5. However, the positions of the five pins 5 are not evenly distributed; instead, the five angles are set to 60°, 60°, 60°, 60°, and 120°. Secondly, the installation positions of the pins 5 in adjacent groups are different, such as... Figure 4 , Figure 5 and Figure 6 As shown, this is mainly to ensure that the pins 5 are not identical, making the concrete more solid and stable after pouring.

[0040] The above-described specific embodiments are merely preferred embodiments of this utility model and are not intended to limit the implementation of this utility model or the scope of the claims. All equivalent changes and modifications made in accordance with the scope of protection of this utility model patent application should be included within the scope of this utility model patent application.

Claims

1. A water-cooled furnace wall structure for an SZL boiler, characterized in that: It includes a water-cooled wall assembly consisting of a front wall water-cooled wall (1), a rear wall water-cooled wall (2), and a side wall water-cooled wall (3), and a water-cooled screen assembly consisting of several water-cooled screen tubes (4); The water-cooled screen tube (4) extends into the water-cooled wall assembly, and the outside of the water-cooled screen tube (4) is covered with refractory concrete (6).

2. The SZL boiler water-cooled furnace wall structure according to claim 1, characterized in that: The water-cooled screen tubes (4) are arranged in a row from top to bottom and are parallel to each other. They pass obliquely through the front wall water-cooled wall (1) and then bend upwards.

3. The SZL boiler water-cooled furnace wall structure according to claim 2, characterized in that: The two lowest tubes of the water-cooled screen tube (4) are covered with refractory concrete (6).

4. The SZL boiler water-cooled furnace wall structure according to claim 3, characterized in that: One end of the refractory concrete (6) extends to the front wall water-cooled wall (1), and the other end extends to the bend of the water-cooled screen tube (4).

5. The SZL boiler water-cooled furnace wall structure according to claim 3, characterized in that: The two lowest tubes of the water-cooled screen tube (4) are also provided with several sets of evenly spaced pins (5), and the refractory concrete (6) covers the pins (5).

6. The SZL boiler water-cooled furnace wall structure according to claim 5, characterized in that: The pin (5) is fixed to the water-cooled screen tube (4) by welding.

7. The SZL boiler water-cooled furnace wall structure according to claim 5, characterized in that: The distance between two adjacent sets of pins (5) on the same water-cooled screen tube (4) is set to 50mm.

8. The SZL boiler water-cooled furnace wall structure according to claim 5, characterized in that: Each set of pins (5) on the water-cooled screen tube (4) has five pins. The angle between adjacent pins (5) in the same set is not uniform, and the positions of adjacent sets of pins (5) are different.

9. The SZL boiler water-cooled furnace wall structure according to claim 8, characterized in that: The angles between adjacent pins (5) in the same group are set to 60°, 60°, 60°, 60° and 120° respectively.

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