CN216281355U - Boiler tail gas nitrogen oxide low emission control device - Google Patents

Abstract

The utility model discloses a boiler tail gas nitrogen oxide low emission control device which comprises a boiler body, a return pipe and an induced draft fan body, wherein a temperature detection device body is fixedly arranged on the front surface of the boiler body, a hole is formed in one side of the boiler body and communicated with the boiler body, an air inlet pipe is communicated and arranged at one end, far away from the boiler body, of the air blower body, the hole is formed in the air inlet pipe and communicated and arranged with one end of the return pipe, the other end of the return pipe is communicated and arranged with one side of the induced draft fan body, the bottom of the induced draft fan body is communicated and arranged with the top of the boiler body, and a chimney body is communicated and arranged at the top end of the induced draft fan body. The utility model solves the problem that the discharge amount of nitrogen oxides does not reach the standard.

Description

Boiler tail gas nitrogen oxide low emission control device

Technical Field

The utility model relates to the technical field of low emission of nitric oxides in boiler tail gas, in particular to a low emission control device for the nitric oxides in the boiler tail gas.

Background

NOX is mostly produced during the combustion of various fuels, with NO accounting for about 90% to 95% of the total NOX, and is rapidly oxidized in the atmosphere to more toxic NO 2. The NOx generated in the fuel combustion comprises three types of thermal type (more than 90 percent), rapid type (more than 5 percent) and fuel type, wherein the main condition for generating the thermal type NOx is very high combustion temperature, nitrogen molecules are free to improve chemical activity, the reaction rate is exponentially increased along with the increase of combustion reaction temperature T, the generation amount of NO is very small when the T is less than 1200 ℃, and the reaction rate is increased by 6-7 times when the T is more than 1200 ℃ per 100 ℃ increase.

When a boiler in operation works for a gas-fired boiler which takes natural gas as a raw material and is mixed with air for combustion, the boiler has the characteristics of quick temperature rise, high combustion temperature and the like, but the content of nitrogen oxides in tail gas exceeds the standard, and in order to control the low-content emission of the nitrogen oxides in the tail gas of the boiler, the device for controlling the low-emission of the nitrogen oxides in the tail gas of the boiler is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a boiler tail gas nitrogen oxide low-emission control device, which has the advantage of effectively controlling the emission of nitrogen oxides in boiler tail gas and solves the problem that the emission of nitrogen oxides does not reach the standard.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a low emission control device of boiler tail gas nitrogen oxide, includes boiler body, back flow, draught fan body and base, the positive fixed mounting of boiler body has the temperature-detecting device body, boiler body one side trompil and intercommunication are installed the air-blower body, the air-blower body is kept away from the one end intercommunication of boiler body and is installed the air-supply line, trompil and with back flow one end intercommunication installation on the air-supply line, the back flow other end and draught fan body one side intercommunication installation, draught fan body bottom and boiler body top intercommunication installation, the chimney body is installed in draught fan body top intercommunication.

Preferably, the four corners of the lower surface of the boiler body are respectively and fixedly provided with supporting rods, the boiler body is fixedly arranged on the upper surface of the base through the four supporting rods, a gas pipe is arranged on the opening of the other side of the boiler body and communicated with the opening of the other side of the boiler body, and a manual valve body is fixedly arranged on the gas pipe.

Preferably, a first electromagnetic valve is fixedly installed on the air inlet pipe on the opposite side of the air blower body and the return pipe, the first electromagnetic valve is electrically connected with the temperature detection device body, and the diameter of the air inlet pipe is DN 1000.

Preferably, a second electromagnetic valve is fixedly mounted on the return pipe, a tail gas detection device body is fixedly mounted on the return pipe on one side, opposite to the draught fan body, of the second electromagnetic valve, the tail gas detection device body is electrically connected with the second electromagnetic valve, and the diameter of the return pipe is DN 600.

Preferably, the bottom end of the chimney body is fixedly provided with a filtering device body.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the air inlet pipe and the return pipe are arranged, the induced draft fan body is arranged at the top end of the boiler body, the tail gas is sucked out by the induced draft fan body and is injected into the air inlet pipe through the return pipe, and the tail gas enters the boiler body again for combustion under the action of the air blower body, so that the effects of improving the combustion efficiency and reducing the tail gas emission are achieved.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic top view of the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 2.

In the figure: 1. a boiler body; 2. an air inlet pipe; 3. a return pipe; 4. a first solenoid valve; 5. a blower body; 6. a second solenoid valve; 7. a tail gas detection device body; 8. a temperature detection device body; 9. a filter device body; 10. a chimney body; 11. a draught fan body; 12. a gas pipe; 13. a manual valve body; 14. a support bar; 15. a base.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 3, an embodiment of the present invention includes: the utility model provides a low emission control device of boiler tail gas nitrogen oxide, includes boiler body 1, back flow 3, draught fan body 11 and base 15, and 1 lower surface four corners of boiler body do not fixed mounting have a bracing piece 14, and boiler body 1 is through four bracing pieces 14 fixed mounting at the 15 upper surface of base, and 1 opposite side trompil of boiler body and intercommunication install gas pipe 12, and fixed mounting has manual valve body 13 on the gas pipe 12. The positive fixed mounting of boiler body 1 has temperature-detecting device body 8, and boiler body 1 one side trompil and intercommunication are installed air-blower body 5, and air-blower body 5 keeps away from the one end intercommunication of boiler body 1 and installs air-supply line 2, trompil and the installation of 3 one end intercommunication of back flow on the air-supply line 2, and fixed mounting has first solenoid valve 4 on air-supply line 2 of air-blower body 5 and the relative one side of back flow 3, and first solenoid valve 4 is connected with temperature-detecting device body 8 electricity, and air-supply line 2 pipe diameter is DN 1000.

The other end of the return pipe 3 is communicated with one side of the draught fan body 11 for installation, a second electromagnetic valve 6 is fixedly installed on the return pipe 3, a tail gas detection device body 7 is fixedly installed on the return pipe 3 on one side, opposite to the draught fan body 11, of the second electromagnetic valve 6, the tail gas detection device body 7 is electrically connected with the second electromagnetic valve 6, and the pipe diameter of the return pipe 3 is DN 600. 11 bottoms of draught fan body and 1 top intercommunication installation of boiler body, chimney body 10 is installed to 11 top intercommunications of draught fan body. The filtering device body 9 is fixedly arranged at the bottom end of the chimney body 10. Through setting up air-supply line 2 and back flow 3 to at 1 top installation draught fan body 11 of boiler body, through draught fan body 11 with the tail gas suction and inject into the air-supply line 2 through back flow 3 in, and make tail gas reentrant boiler body 1 burn under the effect of air-blower body 5, reached the effect that improves combustion efficiency and reduce exhaust emissions.

The working principle is as follows: when the utility model is used, natural gas enters the boiler body 1 through the gas pipe 12, air on the outer wall is compressed through the air blower body 5 and then is injected into the boiler body 1, so that the natural gas is combusted in the boiler body 1, then tail gas generated in the process is sucked out by the draught fan body 11, about 20 percent of the tail gas is injected into the return pipe 3, the tail gas enters the air inlet pipe 2 again through the return pipe 3, the air mixed with the tail gas is injected into the boiler body 1 again through the air blower body 5, redundant tail gas is filtered through the filter device body 9 through the chimney body 10 and then is discharged, when the tail gas enters the return pipe 3, the content of nitrogen oxide in the tail gas is detected and recorded through the tail gas detection device body 7, the second electromagnetic valve 6 is selectively opened or closed according to actual conditions, and simultaneously, when the boiler body 1 works, the temperature in the boiler is detected through the temperature detection device body 8, and the opening and closing of the first electromagnetic valve 4 are adjusted according to the actual situation, thereby controlling the temperature in the boiler body 1.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. The utility model provides a low emission control device of boiler tail gas nitrogen oxide, includes boiler body (1), back flow (3), draught fan body (11) and base (15), its characterized in that: boiler body (1) openly fixed mounting has temperature-detecting device body (8), air-blower body (5) are installed to boiler body (1) one side trompil and intercommunication, air-blower body (5) are kept away from the one end intercommunication of boiler body (1) and are installed air-supply line (2), trompil and with back flow (3) one end intercommunication installation on air-supply line (2), the back flow (3) other end and draught fan body (11) one side intercommunication installation, draught fan body (11) bottom and boiler body (1) top intercommunication installation, chimney body (10) are installed to draught fan body (11) top intercommunication.

2. The boiler tail gas nitrogen oxide low emission control device according to claim 1, characterized in that: boiler body (1) lower surface four corners department fixed mounting respectively has bracing piece (14), and boiler body (1) is through four bracing pieces (14) fixed mounting at base (15) upper surface, and gas pipe (12) are installed in boiler body (1) opposite side trompil and intercommunication, and fixed mounting has manual valve body (13) on gas pipe (12).

3. The boiler tail gas nitrogen oxide low emission control device according to claim 1, characterized in that: the air blower is characterized in that a first electromagnetic valve (4) is fixedly mounted on the air inlet pipe (2) on one side, opposite to the return pipe (3), of the air blower body (5), the first electromagnetic valve (4) is electrically connected with the temperature detection device body (8), and the pipe diameter of the air inlet pipe (2) is DN 1000.

4. The boiler tail gas nitrogen oxide low emission control device according to claim 1, characterized in that: fixedly mounted has second solenoid valve (6) on back flow (3), and fixedly mounted has tail gas detection device body (7) on second solenoid valve (6) and back flow (3) of the relative one side of draught fan body (11), and tail gas detection device body (7) are connected with second solenoid valve (6) electricity, and back flow (3) pipe diameter is DN 600.

5. The boiler tail gas nitrogen oxide low emission control device according to claim 1, characterized in that: the bottom end of the chimney body (10) is fixedly provided with a filtering device body (9).

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