CN219589252U

CN219589252U - Furnace wall jet orifice cooling device of dry denitration system

Info

Publication number: CN219589252U
Application number: CN202320508974.5U
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Tnpl Environmental Engineering Co ltd
Current assignee: Tnpl Environmental Engineering Co ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2023-08-25
Anticipated expiration: 2033-03-16

Abstract

The utility model relates to a furnace wall jet orifice cooling device of a dry denitration system, which is characterized in that: the jet orifice is of a sleeve structure, the end face of the inner tube at one side in the furnace is positioned inside the outer tube, the inner tube and the outer tube are connected through a flange and form a concentric annular space, and the annular space is communicated with the side tube fixedly arranged on the outer tube. The dry desulfurization system is provided with a plurality of groups of jet ports on each boiler, a Roots blower is used as an air source, air is supplied to the side pipes of each jet port through a cooling air main pipeline, a demultiplexer and a cooling air branch pipeline, the air flow in an annular space simultaneously cools the inner pipe and the outer pipe, and the temperature of the inner pipe is obviously lower than that of the outer pipe in a steady state. The conveying gas carrying the powdery denitration agent is sprayed into the furnace through the inner pipe, and the risk that the denitration agent is heated to form a shrinkage decomposition product to adhere to the jet orifice before being separated from the jet orifice is avoided due to the cooling effect of the device, so that the stable operation of the dry denitration system is ensured.

Description

Furnace wall jet orifice cooling device of dry denitration system

Technical Field

The utility model belongs to the technical field of environmental protection, and relates to a dry denitration system, in particular to a furnace wall jet orifice at the tail end of a denitration agent pneumatic conveying line.

Background

In recent years, along with the improvement of the flue gas emission standard of the coal-fired boiler, the dry denitration has the advantages of simple process system, small occupied area, low equipment cost, low water consumption and the like, and the application proportion is also higher and higher.

According to the technological requirements of dry denitration, in order to achieve the designed removal efficiency, the powder denitration agent needs to be carried by high-speed air flow to pass through a furnace wall from a plurality of groups of jet ports to be jetted into a boiler, the powder denitration agent is fully contacted with high-temperature flue gas in the boiler and subjected to pyrolysis reaction, and the pyrolysis product and nitrogen oxides in the flue gas undergo reduction reaction to reduce harmful gas nitrogen oxides into harmless nitrogen.

For dry denitration, it is ideal that the powdery denitration agent is subjected to pyrolysis reaction again when mixed with high-temperature flue gas after being separated from the jet orifice, but engineering practice finds that the powdery denitration agent is subjected to condensation reaction by heating before being separated from the outlet of the jet orifice, so that condensation products (biuret, triurea and melamine) adhere to the inner wall of the jet orifice pipe. The thickening of the adhesion layer to a certain extent can cause the increase of the resistance of the jet orifice pipeline and even the blocking of the pipe, and the stable operation of the dry denitration jet system is affected.

Disclosure of Invention

The utility model aims at providing a furnace wall jet orifice cooling device for a boiler flue gas dry denitration system, which effectively reduces the temperature of an inner pipe of a jet orifice through cooling of annular air flow of a sleeve and avoids that powdery denitration agent carried by jet air flow is heated in the jet orifice to generate a shrinkage and decomposition reaction to form a shrinkage and decomposition product and is adhered to the inner wall of the jet orifice.

The purpose of the utility model is realized in the following way:

the developed furnace wall jet orifice cooling device has jet orifices in several groups and flange connected sleeve structure, and the sleeve has side pipe to form one gas flow passage from the side pipe to the annular space of the sleeve and to the space inside the furnace.

The multiple groups of jet ports are respectively provided with cooling air flow for the jet port side pipes by a Roots blower for providing an air source, a cooling air main pipeline, a demultiplexer and a cooling air branch pipeline.

The cooling air flow flowing into the jet port side pipe continuously absorbs heat from the inner pipe and the outer pipe in the process of flowing into the furnace through the annular space, and when the heat transfer reaches a steady state, the heat taken away from the inner pipe by the annular space air flow is equal to the radiant heat absorbed from the height Wen Waiguan by the inner pipe.

Furthermore, in order to strengthen the cooling effect of the cooling air flow, water mist can be added into the main pipeline or the branch pipeline through the humidifying device in the cooling air flow.

The utility model has the advantages and positive effects that:

1. the device ensures that the inner pipe of the jet orifice in direct contact with the denitration agent material is always at a lower temperature through the sweeping and cooling effects of the annular gap cooling air flow, avoids the risk that a shrinkage decomposition product formed by heating the denitration agent adheres to the inner wall of the jet orifice, and ensures the stable operation of a dry denitration system.

2. The device has small air consumption and little influence on the combustion condition of the boiler.

3. The device has simple structure and is convenient to overhaul.

Drawings

Fig. 1 is a front view, in full section, of an ejection port portion of the present utility model;

fig. 2 is a schematic view of an injection port cooling device.

In the figure: 1. furnace wall, 2, outer tube, 3, inner tube, 4, positioning steel wire, 5, side tube, 6, flange 1,7, sealing gasket, 8, flange 2,9, fastening piece, 10, jet orifice, 11, cooling gas branch pipeline, 12, demultiplexer, 13, cooling gas main pipeline, 14, humidifying device, 15, roots blower.

Detailed Description

Embodiments of the utility model are further described below with reference to the accompanying drawings: the following examples are illustrative, not limiting, and are not intended to limit the scope of the utility model.

The innovation point of the utility model is that:

the utility model provides a dry process denitration system furnace wall jet orifice heat sink, includes that arrange in the jet orifice (10) of the multiunit sleeve pipe structure and outer tube (2) area side pipe (5) of boiler furnace wall (1), its characterized in that: the plurality of groups of jet ports (10) are provided with cooling air flow to the jet port side pipes (5) by a Roots blower (15) for providing air source, a main cooling air pipeline (13), a demultiplexer (12) and a branch cooling air pipeline (11).

Moreover, an outer tube (2) of the sleeve structure of the jet orifice (10) penetrates through the furnace wall (1), and the inner end of the outer tube (2) protrudes out of the wall surface of the furnace wall (1); the inner pipe (3) is inserted into the outer pipe (2) and the end face at one side in the furnace is positioned in the outer pipe (2); the inner tube (3) is uniformly distributed in the circumferential direction through 3 positioning steel wires (4) fixedly connected to the outer wall of the inner tube (3) and the outer tube (2) are kept concentric; the outer wall of the inner tube (3) is fixedly connected with a flange 2 (8) and the outer end of the inner tube (3) penetrates out of the fixedly connected flange, and the fixedly connected flange is connected with a fastener (9) through a sealing gasket (7) with the fixedly connected flange 1 (6) at the outer end of the outer tube (2); the outer tube (2) is fixedly connected with a side tube (5) outside the wall surface of the furnace wall (1), and the side tube (5) is communicated with the concentric annular gap between the sleeves and the space in the furnace.

Furthermore, the demultiplexer (12) is used for dividing one air flow of the cooling air main pipeline (13) into a plurality of air flows with the same number as the jet ports (10) more uniformly.

In addition, water mist can be added into the cooling air main pipeline (11) or the cooling air branch pipeline (13) through the humidifying device (14), so that the cooling effect of the jet orifice cooling device is improved.

Furthermore, the sleeve structure of the injection port (10) in this embodiment adopts a manner of uniformly and fixedly connecting 3 positioning steel wires (the diameter of the steel wires is slightly smaller than the width of the annular gap) on the outer side of the inner tube in a circumferential direction, and a flange fixing connection manner adopted by the inner tube and the outer tube, which is only a measure for realizing concentricity of the inner tube and the outer tube and ensuring rigidity of the inner tube, is only a preferred manner adopted by the embodiment, and cannot limit the protection scope of the utility model by the embodiment.

Claims

1. The utility model provides a dry process denitration system furnace wall jet orifice heat sink, includes the jet orifice of arranging the multiunit sleeve pipe structure and outer tube area side pipe at boiler furnace wall, its characterized in that: the multiple groups of jet ports are used for providing cooling air flow for the jet port side pipes by a Roots blower for providing an air source, a cooling air main pipeline, a demultiplexer and a cooling air branch pipeline.

2. The furnace wall jet cooling device of the dry denitration system according to claim 1, wherein the furnace wall jet cooling device is characterized in that; the sleeve pipe structure outer pipe of the jet orifice penetrates through the furnace wall, and the inner end of the outer pipe extends out of the inner wall surface of the furnace wall; the inner tube is inserted into the outer tube, and the end face at one side in the furnace is positioned in the outer tube; the inner tube is uniformly distributed in the circumferential direction through 3 positioning steel wires fixedly connected to the outer wall of the inner tube and kept concentric with the outer tube; the outer wall of the inner tube is fixedly connected with a flange, the outer end of the inner tube penetrates out of the fixedly connected flange, and the fixedly connected flange is connected with the outer end of the outer tube through a sealing gasket and a fastener; the outer tube is fixedly connected with a side tube between the outer wall surface of the furnace wall and the flange, and the side tube is communicated with a concentric annular gap between the inner tube and the outer tube and the space in the furnace.

3. The furnace wall jet cooling device of the dry denitration system according to claim 1, wherein the furnace wall jet cooling device is characterized in that; the demultiplexer is used for dividing one air flow of the cooling air main pipeline into a plurality of air flows with the same number as the jet ports.

4. The furnace wall jet cooling device of the dry denitration system according to claim 1, wherein the furnace wall jet cooling device is characterized in that; the cooling air flow can be added with water mist in the cooling air main pipeline or the cooling air branch pipeline through the humidifying device, so that the cooling effect of the jet orifice cooling device is improved.