Single-pass positive pressure gas waste heat boiler

Abstract

This utility model discloses a single-channel positive pressure gas waste heat boiler, specifically relating to the field of boiler technology. It includes a steam drum, a steam collector, a boiler body, and a pressure-bearing shell. The entire boiler body is housed within the circular pressure-bearing shell, while the steam drum and steam collector are located outside the shell and connected to the boiler body inside the shell via connecting pipes. The pipes are sealed at their penetration points into the shell. The boiler body is divided into upper and lower sections. The upper high-temperature zone is surrounded by a constant-temperature membrane water-cooled wall, while the lower low-temperature zone is constructed from welded steel plates. Two gas outlets connect the lower flue outlet to the pressure-bearing shell, forming a connecting layer. The inner wall of the pressure-bearing shell is insulated. A high-temperature superheater, a low-temperature superheater, and an evaporator are sequentially arranged at the top of the boiler body, while an economizer is arranged at the bottom. This utility model solves the problem of arranging the pressure-bearing and heating surfaces in traditional boilers, offering advantages such as reduced sealing difficulty, optimized heat exchange process, pressure balance, simplified insulation, and improved safety and energy efficiency.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and more specifically, to a single-channel positive pressure gas waste heat boiler. Background Technology

[0002] Positive pressure coal gas contains large amounts of flammable, explosive, and toxic gases such as carbon monoxide, hydrogen, and methane. It also has high temperature, high dust content, and high pressure. Therefore, the boiler must have zero air leakage, and ash removal cannot be performed during boiler operation.

[0003] Currently, the main type of boiler is the vertical circular fire-tube saturated boiler. The pressure-bearing capacity of a circular shape is much greater than that of a square shape. However, circular fire-tube boilers cannot be scaled up, as they can only produce saturated steam and cannot meet the requirements of large-scale, high-parameter boilers. Although square water-tube boilers offer flexible arrangement of heating surfaces and are not limited by parameters, their pressure-bearing capacity is too poor, and sealing them is very difficult.

[0004] Therefore, a single-channel positive pressure gas waste heat boiler is proposed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a single-channel positive pressure gas waste heat boiler to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a single-channel positive pressure gas waste heat boiler, comprising a steam drum, a steam collection box, a boiler body, and a pressure-bearing shell;

[0007] The entire boiler body is housed inside a circular pressure-bearing shell;

[0008] The steam drum and steam collector are arranged outside the pressure-bearing shell and connected to the boiler body inside the pressure-bearing shell through connecting pipes. The pipes are sealed where they pass through the pressure-bearing shell.

[0009] Preferably, the boiler body is divided into upper and lower sections, namely an upper high-temperature zone and a lower low-temperature zone. The upper high-temperature zone is surrounded by a constant-temperature membrane water-cooled wall, and the lower low-temperature zone is surrounded by welded steel protective plates.

[0010] Preferably, the lower flue outlet of the boiler body has two air outlets at the connection between the flue outlet and the pressure shell, and these air outlets are connected to the interlayer between the pressure shell and the boiler body.

[0011] Preferably, the inner wall of the pressure-bearing shell is provided with a heat insulation layer.

[0012] Preferably, the upper high-temperature zone of the boiler body is located inside the water-cooled wall flue, and a high-temperature superheater, a low-temperature superheater, and three sets of evaporators are arranged sequentially from top to bottom.

[0013] Preferably, three sets of economizers are arranged in the lower low-temperature zone below the water-cooled wall flue.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. By placing the boiler body inside a circular pressure-bearing shell, the advantages of the circular structure's strong pressure-bearing capacity and the square structure's flexible heating surface arrangement are combined. This solves both the problem of limited heating surface arrangement in circular fire-tube boilers and the problem of poor pressure-bearing capacity in square water-tube boilers, enabling the boiler to meet the needs of large-scale and high-parameter applications.

[0016] 2. Since the boiler's instrument valves are concentrated on the steam drum and steam manifold, only the steam drum and steam manifold are located outside the shell, while other pressure-bearing components are inside the shell. Only the pipe penetrations through the shell need to be sealed. Compared with traditional boilers, this greatly reduces the difficulty of sealing work, helps to achieve the requirement of zero air leakage in the boiler, and improves safety.

[0017] 3. The boiler body is divided into upper and lower sections. The upper high-temperature zone adopts a constant-temperature membrane water-cooled wall, and a high-temperature superheater, a low-temperature superheater, and three sets of evaporators are arranged in sequence inside. The lower low-temperature zone is equipped with three sets of economizers. This layout makes the heat exchange process of high-temperature gas in the boiler more reasonable. It enters from the top and passes through each heating surface in sequence for full heat exchange. Finally, the flue gas temperature drops to below 180℃ before being discharged, which improves energy utilization efficiency.

[0018] 4. By setting two gas outlets at the connection between the lower flue outlet of the boiler body and the pressure shell, the interlayer between the pressure shell and the boiler body can be connected, which can balance the gas pressure in the boiler body and transfer the pressure to the inner wall of the pressure shell. At the same time, since the interlayer is filled with low-temperature gas, the outer wall of the boiler body flue does not need to be insulated, and only the inner wall of the pressure shell needs to be simply insulated, saving insulation materials and costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0020] Figure 2 This is a top view of the structure of this utility model.

[0021] The attached diagram is labeled as follows: 1. Steam drum; 2. Steam header; 3. Boiler body; 4. Pressure shell. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] As attached Figure 1-2 The single-channel positive pressure gas waste heat boiler shown includes a steam drum 1, a steam collection box 2, a boiler body 3, and a pressure-bearing shell 4;

[0024] The entire boiler body 3 is placed inside the circular pressure-bearing shell 4;

[0025] The steam drum 1 and the steam collection box 2 are arranged outside the pressure-bearing shell 4 and are connected to the boiler body 3 inside the pressure-bearing shell 4 through connecting pipes, and the pipes are sealed at the points where they pass through the pressure-bearing shell 4.

[0026] The boiler body is divided into two sections: an upper high-temperature zone and a lower low-temperature zone. The upper high-temperature zone is surrounded by a constant-temperature membrane water-cooled wall, while the lower low-temperature zone is surrounded by welded steel protective plates.

[0027] Two air outlets are opened at the connection between the lower flue outlet of the boiler body 3 and the pressure shell 4. These air outlets are connected to the interlayer between the pressure shell 4 and the boiler body 3.

[0028] The inner wall of the pressure-bearing shell 4 is provided with a heat insulation layer.

[0029] The upper high-temperature zone of the boiler body 3 is located inside the water-cooled wall flue, and from top to bottom, a high-temperature superheater, a low-temperature superheater, and three sets of evaporators are arranged sequentially.

[0030] Three economizers are arranged in the lower low-temperature zone below the water-cooled wall flue.

[0031] In practice, all the boiler's instrument valves are concentrated on the steam drum 1 and the steam collector 2. Therefore, only the boiler steam drum 1 and the steam collector 2 are placed outside the pressure-bearing shell 4, while all other pressure-bearing components are arranged inside the pressure-bearing shell 4. The pipelines are connected to the steam drum 1 and the steam collector 2, and only the connection between the pipelines and the pressure-bearing shell 4 needs to be sealed, which greatly reduces the difficulty of the sealing work.

[0032] The boiler body 3 consists of two parts, upper and lower. The upper high-temperature zone, that is, above the economizer, is where the flue gas temperature is above 350℃. The flue is surrounded by constant temperature membrane water-cooled walls. Inside the flue of the water-cooled walls, from top to bottom, there are high-temperature superheaters, low-temperature superheaters, and three sets of evaporators. Below the water-cooled walls, there are three sets of economizers. The flue around the economizers is welded from steel plates.

[0033] High-temperature gas enters the membrane water-cooled flue from the top. The gas flows through the high and low temperature superheaters and three sets of evaporators in sequence, and then enters the three sets of economizers in the lower part for heat exchange. After the flue gas temperature drops to below 180℃, it is discharged outside the shell through the connecting flue.

[0034] Two gas outlets are opened on the connecting flue between the economizer outlet and the shell, which are connected to the interlayer between the pressure shell 4 and the boiler body 3 to balance the gas pressure in the boiler body 3 and transmit the gas pressure in the boiler body 3 to the inner wall of the pressure shell 4.

[0035] Since the interlayer between the pressure shell 4 and the flue of the boiler body 3 is filled with low-temperature gas, the outer wall of the flue of the boiler body 3 does not need to be insulated; only the inner wall of the pressure shell 4 needs to be simply insulated.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A single-channel positive pressure gas waste heat boiler, characterized in that, It includes a steam drum (1), a steam collection box (2), a boiler body (3), and a pressure shell (4); The boiler body (3) is entirely placed inside the circular pressure-bearing shell (4); The steam drum (1) and steam collector (2) are arranged outside the pressure shell (4) and connected to the boiler body (3) inside the pressure shell (4) through connecting pipes, and the pipes are sealed at the point where they pass through the pressure shell (4).

2. The single-channel positive pressure gas waste heat boiler according to claim 1, characterized in that, The boiler body (3) is divided into upper and lower sections, namely the upper high-temperature zone and the lower low-temperature zone. The upper high-temperature zone is composed of constant temperature membrane water-cooled walls, and the lower low-temperature zone is composed of steel protective plates welded together.

3. A single-channel positive pressure gas waste heat boiler according to claim 2, characterized in that, Two air outlets are opened at the connection between the lower flue outlet of the boiler body (3) and the pressure shell (4), and the air outlets are connected to the interlayer between the pressure shell (4) and the boiler body (3).

4. A single-channel positive pressure gas waste heat boiler according to claim 3, characterized in that, The inner wall of the pressure-bearing shell (4) is provided with a heat insulation layer.

5. A single-channel positive pressure gas waste heat boiler according to claim 4, characterized in that, The upper high-temperature zone of the boiler body (3) is located inside the water-cooled wall flue, and is arranged from top to bottom as a high-temperature superheater, a low-temperature superheater, and three sets of evaporators.

6. A single-channel positive pressure gas waste heat boiler according to claim 5, characterized in that, Three economizers are arranged in the lower low-temperature zone below the water-cooled wall flue.

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