Stokehole sludge feeding port

Abstract

The utility model discloses a stokehole sludge feeding port, which relates to the technical field of stokehole sludge feeding ports of sludge circulating fluidized bed boilers for combustion, and comprises an arc-shaped stokehole sludge feeding pipe and a front wall water cooling wall, and first-stage conveying air and second-stage conveying air which are used for loosening and conveying sludge are arranged on the arc-shaped stokehole sludge feeding pipe. According to the utility model, the sludge in front of the boiler can be continuously and stably conveyed into the boiler, a second-stage spiral feeding conveyor in a sludge spiral feeding system can be replaced, and the investment and operation cost can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of a furnace front sludge feeding port of a sludge burning circulating fluidized bed boiler, in particular to a furnace front sludge feeding port. Background Art

[0002] my country is a big country in papermaking. A large amount of sewage will be generated in the papermaking process. After being treated in the sewage treatment plant, a large amount of solid waste sludge will be generated. After being dried, the sludge can be used as fuel for the circulating fluidized bed boiler. In view of the characteristics of the sludge itself, in order to ensure that the sludge is continuously and stably fed into the furnace, the currently commonly used sludge feeding system is as follows: after the sludge is dried, it is sent to the sludge silo, and after passing through the first-stage screw feeding conveyor and the drop pipe, it is sent into the furnace through the second-stage screw feeding conveyor. Although the above method can convey continuously and stably, the investment and operation costs are relatively high. Under the premise of ensuring the continuous and stable transportation of sludge, in order to reduce the investment and operation costs, a new type of furnace front sludge feeding port is designed to replace the second-stage screw feeding conveyor. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a furnace front sludge feeding port for replacing a secondary spiral feeding conveyor, thereby reducing investment and operating costs, preventing the furnace front feeding port from being blocked, and meeting the continuity and stability of sludge furnace front transportation.

[0004] The purpose of the utility model is achieved through the following technical solutions: a furnace front sludge feeding port, including an arc-shaped furnace front sludge feeding pipe and a front wall water-cooled wall, the arc-shaped furnace front sludge feeding pipe is connected to the front wall water-cooled wall, the arc-shaped furnace front sludge feeding pipe is provided with a first-stage conveying air and a second-stage conveying air for loosening and conveying the sludge, the first-stage conveying air and the second-stage conveying air are taken from high-pressure fluidizing air or compressed air.

[0005] Furthermore, the arc-shaped furnace sludge feeding pipe is provided with a coke clearing pipe for manual coke clearing, and the coke clearing pipe is connected with a second-stage conveying air, and the second-stage conveying air can be used as cooling air during coke clearing.

[0006] Furthermore, an observation hole is provided at the top of the decoking pipe for observing the operation of the sludge outlet, and the bottom of the decoking pipe is connected to the arc-shaped furnace front sludge feeding pipe.

[0007] The furnace sludge feeding port also includes an upstream drop pipe, the bottom of which is connected to the top of the arc-shaped furnace sludge feeding pipe.

[0008] Furthermore, the angle formed between the upstream drop pipe and the horizontal plane is not less than 65°, ensuring that the sludge can slide down continuously and stably under the action of gravity.

[0009] Furthermore, the bottom of the arc-shaped furnace front sludge feeding pipe is sealed and fixed to the front wall water-cooling wall through a cover shell.

[0010] Furthermore, the connection between the bottom of the arc-shaped furnace front sludge feeding pipe and the front wall water-cooled wall is sealed by welding, and is fixed by a cover for secondary sealing, which not only reinforces the connection between the arc-shaped furnace front sludge feeding pipe and the front wall water-cooled wall, but also avoids smoke leakage in the furnace.

[0011] Compared with the existing second-stage spiral feeding conveyor, the utility model adopts an arc-shaped furnace sludge feeding port, a first-stage conveying air and a second-stage conveying air, so that the sludge is pneumatically conveyed to the furnace under the action of gravity, so as to meet the continuous and stable conveying of the sludge. However, the structure is much simpler than the spiral feeding conveyor, and the necessary driving system and control system of the spiral feeding conveyor are cancelled, and the on-site installation is convenient, which greatly reduces the initial investment cost and the later operation cost of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] In the figure: 1-upstream drop pipe, 2-arc-shaped furnace front sludge feeding pipe, 3-first stage conveying air, 4-second stage conveying air, 5-observation hole, 6-coke cleaning pipe, 7-front wall water-cooled wall, 8-cover. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0015] The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Embodiment 1:

[0017] like Figure 1As shown, a furnace sludge feeding port includes an arc-shaped furnace sludge feeding pipe 2 and a front wall water-cooled wall 7. The arc-shaped furnace sludge feeding pipe 2 is connected to the front wall water-cooled wall 7. The arc-shaped furnace sludge feeding pipe 2 is provided with a first-stage conveying wind 3 and a second-stage conveying wind 4 for loosening and conveying sludge. The first-stage conveying wind 3 and the second-stage conveying wind 4 are taken from high-pressure fluidizing wind or compressed air. The sludge enters the arc-shaped furnace sludge feeding pipe 2 under the action of gravity, and then is pneumatically conveyed by the first-stage conveying wind 3 and the second-stage conveying wind 4 through the feeding port on the front wall water-cooled wall 7 and is delivered to the furnace.

[0018] Embodiment 2:

[0019] On the basis of Example 1, this embodiment makes an improvement on the arc-shaped pre-furnace sludge feeding pipe 2. A coke clearing pipe 6 for coke clearing is provided on the arc-shaped pre-furnace sludge feeding pipe 2, and coke clearing can be performed manually. The coke clearing pipe 6 is connected to the second-stage transport air 4. During coke clearing, the second-stage transport air 4 can be used as cooling air.

[0020] An observation hole 5 is provided at the top of the coke cleaning pipe 6 for observing the operation of the sludge outlet, and the bottom of the coke cleaning pipe 6 is connected to the arc-shaped furnace front sludge feeding pipe 2.

[0021] Embodiment 3:

[0022] On the basis of Example 2, the furnace sludge feeding port further includes an upstream drop pipe 1 , the bottom of which is connected to the top of the arc-shaped furnace sludge feeding pipe 2 .

[0023] The angle between the upstream drop pipe 1 and the horizontal plane is not less than 65°, ensuring that the sludge can slide down continuously and stably under the action of gravity. After the sludge passes through the upstream drop pipe 1 under the action of gravity, it enters the arc-shaped furnace front sludge feeding pipe 2, and then is fed into the furnace through the feeding port on the front wall water-cooled wall 7.

[0024] Embodiment 4:

[0025] On the basis of Examples 1-3, this example makes an improvement on the arc-shaped furnace sludge feeding pipe 2, and the bottom of the arc-shaped furnace sludge feeding pipe 2 is sealed and fixed to the feeding port of the front wall water-cooled wall 7 by a cover shell 8.

[0026] The connection between the bottom of the arc-shaped furnace front sludge feeding pipe 2 and the feeding port of the front wall water-cooled wall 7 is sealed by welding, and is fixed by a cover shell 8 for secondary sealing, which not only reinforces the connection between the arc-shaped furnace front sludge feeding pipe 2 and the front wall water-cooled wall 7, but also avoids smoke leakage in the furnace.

[0027] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A furnace sludge feeding port, characterized in that: The invention comprises an arc-shaped furnace sludge feeding pipe (2) and a front wall water-cooling wall (7), wherein the arc-shaped furnace sludge feeding pipe (2) is connected to the front wall water-cooling wall (7), and the arc-shaped furnace sludge feeding pipe (2) is provided with a first-stage conveying wind (3) and a second-stage conveying wind (4) for loosening and conveying sludge.

2. The furnace sludge feeding port according to claim 1, characterized in that: The arc-shaped furnace sludge feeding pipe (2) is provided with a coke clearing pipe (6), and the coke clearing pipe (6) is connected to a second-stage conveying air (4).

3. The furnace sludge feeding port according to claim 2, characterized in that: The top of the decoking pipe (6) is provided with an observation hole (5), and the bottom of the decoking pipe (6) is connected to the arc-shaped furnace sludge feeding pipe (2).

4. The furnace sludge feeding port according to claim 1, characterized in that: It also comprises an upstream dropping pipe (1), the bottom of which is connected to the top of the arc-shaped pre-furnace sludge feeding pipe (2).

5. The furnace sludge feeding port according to claim 4, characterized in that: The angle formed between the upstream material drop pipe (1) and the horizontal plane is not less than 65°.

6. The furnace sludge feeding port according to claim 1, characterized in that: The bottom of the arc-shaped furnace front sludge feeding pipe (2) is sealed and fixed to the front wall water-cooling wall (7) via a cover shell (8).

7. The furnace sludge feeding port according to claim 6, characterized in that: The connection between the bottom of the arc-shaped furnace sludge feeding pipe (2) and the front wall water-cooling wall (7) is sealed by welding, and is fixed by a cover shell (8) for secondary sealing.

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