CN219518389U

CN219518389U - NOx treatment device for bright furnace equipment

Info

Publication number: CN219518389U
Application number: CN202320529922.6U
Authority: CN
Inventors: 杜小川
Original assignee: Shandong Yiqing Environmental Protection Equipment Co ltd
Current assignee: Shandong Yiqing Environmental Protection Equipment Co ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-08-15
Anticipated expiration: 2033-03-17

Abstract

A NOx treatment device for a bright stove device comprises a reaction kettle main body, wherein a filtering chamber is arranged in the reaction kettle main body, a liquid ammonia nozzle is arranged below the filtering chamber, and a catalytic reaction chamber is arranged above the filtering chamber. The utility model relates to a NOx treatment device for a bright furnace device, which takes ammonia gas as a reducing agent, and reduces NOx into N under the action of a low-temperature catalyst of a catalytic reaction chamber by liquid ammonia sprayed out of a liquid ammonia nozzle by means of the temperature of exhaust gas discharged by the bright furnace device ₂ And H ₂ O, accomplish the waste gas desorption to bright stove equipment, can filter the nitrogen oxide that bright stove equipment during operation produced through this device to can improve the mixing time of ammonia and NOx gas through the setting of ceramic filter, make under the effect of SCR catalyst can be more abundant reduce nitrogen oxide, further improved the purifying effect to NOx, make the clean gas of emission purer, accord with the index of emission.

Description

NOx treatment device for bright furnace equipment

Technical Field

The utility model relates to the technical field of waste gas treatment of a bright furnace, in particular to a NOx treatment device for bright furnace equipment.

Background

The bright furnace is a kind of metal thermal equipment for eliminating internal stress, improving internal (structure) structure and obtaining surface quality of metal parts (usually mainly strips) by a series of heat treatment modes of heating, heat preservation, slow cooling and the like.

During the annealing process of the bright furnace, a large amount of nitrogen oxides (NOx) gas, namely NO and NO, is often generated ₂ The combined mixed gas is usually directly discharged by a chimney, and a treatment device for nitrogen oxides is required to be configured for newly added bright furnace equipment.

According to the existing conditions and environmental characteristics of the bright furnace, according to various removal methods for nitrogen oxides (NOx gases), a NOx treatment device for bright furnace equipment is developed and is used for treating the NOx gases generated by the bright furnace, and the NOx treatment device meets the emission standard.

Disclosure of Invention

In order to solve the technical problems in the background art, the utility model provides a NOx treatment device for a bright stove device.

The technical scheme of the utility model is as follows:

the utility model provides a NOx processing apparatus for bright stove equipment, includes the reation kettle main part, the inside filter chamber that is provided with of reation kettle main part, the filter chamber below is provided with the liquid ammonia nozzle, the filter chamber top is provided with catalytic reaction room. Ammonia is used as a reducing agent, liquid ammonia sprayed out through a liquid ammonia nozzle reacts under the action of a low-temperature catalyst of a catalytic reaction chamber by means of the temperature of exhaust gas exhausted by the bright furnace equipment, nitric oxide and nitrogen dioxide can react with ammonia respectively or simultaneously under the action of the catalyst and are converted into nitrogen and water, the effect of filtering nitrogen oxides in the exhaust gas is achieved, and the formed nitrogen and water meet the emission standard and can be directly discharged outdoors to finish the exhaust gas removal of the bright furnace equipment.

Further, a plurality of cylindrical ceramic filter pieces are arranged in the filter chamber, and the ceramic filter pieces are tiled in the filter chamber along the axial direction of the tube. The function of putting into ceramic filter is conscious through ceramic filter's effect, makes NOx gas, ammonia pass back and forth in the middle of it, increases the route of passing, makes gas mixing more abundant, makes NOx gas obtain more abundant reduction in SCR catalytic system and has laid the foundation, secondly, through ceramic filter's damping, makes NOx gas, ammonia mixed gas's functioning speed slow, and reduction time is more abundant, the reaction is more abundant after entering SCR catalytic system.

In a preferred embodiment of the NOx treatment device for a light-emitting furnace system described above, an SCR catalytic system is provided in the catalytic reaction chamber, the SCR catalytic system being a catalytic reaction zone composed of a honeycomb-shaped low-temperature catalyst. Under the action of the catalyst, the NOx gas is fully reduced through a proper temperature.

As a further preferable aspect, the bottom of the reaction kettle body is provided with a NOx gas discharge port, the NOx gas discharge port is communicated with an exhaust gas discharge port of the furnace equipment for discharging exhaust gas generated by the furnace equipment, the top of the reaction kettle body is provided with a purified gas discharge port, the purified gas discharge port is arranged right above the reaction kettle body, and the purified gas discharge port is communicated with an overhead discharge chimney. The purifying gas discharge port is used for discharging purified gas out of the reaction kettle main body, the high-altitude discharge chimney is used for discharging purified gas into the environment, and the aim of the purifying gas discharge port arranged right above the reaction kettle main body is to facilitate the rapid discharge of nitrogen and water vapor after the catalysis and reduction of NOx gas from the discharge port.

In the NOx treatment device for the bright furnace equipment, the condensing device is arranged between the purified gas discharge port and the high-altitude discharge chimney. The condensing device can condense and intercept the water vapor.

Furthermore, the penetrating directions of the two fixing ports are different, so that the bone growth effect is improved, and the connection strength between the fixing ports and the spine is further ensured.

Further, the gas temperature t discharged from the NOx gas discharge port satisfies: t is less than 250 ℃ and 200 ℃. The temperature of the gas can just meet the temperature requirement of the low-temperature SCR catalytic system for reducing NOx gas.

Furthermore, the quantity of the liquid ammonia nozzles can be symmetrically distributed on two sides of the left and right sides of the reaction kettle main body or four sides of the left and right sides or three sides of the vertex of the inscribed equilateral triangle according to the injection quantity. The quantity of the liquid ammonia nozzles depends on the caliber of the NOx gas exhaust inlet, and the quantity of the liquid ammonia nozzles is specifically set according to the exhaust quantity of the waste gas, so that the liquid ammonia requirement of waste gas purification can be conveniently met.

Further, the liquid ammonia nozzle is communicated with a liquid ammonia storage tank. The liquid ammonia storage tank is used for supplying ammonia gas during the reaction.

The main technical point of the utility model is that the device of the bright furnace and the liquid ammonia storage tank are all existing devices or tools, and the main technical point is that the treatment of the nitrogen oxide compound connected with the device of the bright furnace is carried out after the filtration reaches the standard, and the discharge is carried out.

The utility model has the beneficial effects that: the utility model relates to a NOx treatment device for a bright furnace device, which takes ammonia gas as a reducing agent, and reduces NOx into N under the action of a low-temperature catalyst of a catalytic reaction chamber by liquid ammonia sprayed out of a liquid ammonia nozzle by means of the temperature of exhaust gas discharged by the bright furnace device ₂ And H ₂ O, accomplish the waste gas desorption to bright stove equipment, can filter the nitrogen oxide that bright stove equipment during operation produced through this device to can improve the mixing time of ammonia and NOx gas through the setting of ceramic filter, make under the effect of SCR catalyst can be more abundant reduce nitrogen oxide, further improved the purifying effect to NOx, make the clean gas of emission purer, accord with the index of emission.

Drawings

The aspects and advantages of the present utility model will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model.

In the drawings:

FIG. 1 is a schematic diagram of a NOx treatment device;

FIG. 2 is a schematic view showing an internal structure of a NOx treatment device;

the components represented by the reference numerals in the figures are:

1. a reaction kettle main body; 2. a filtering chamber; 20. a ceramic filter; 3. a liquid ammonia nozzle; 4. a catalytic reaction chamber; 40. an SCR catalytic system; 5. a NOx gas exhaust inlet; 6. a purge gas discharge port; 7. a high-altitude discharge chimney; 8. and a condensing device.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

Examples

The embodiment provides a NOx treatment device for a bright stove device, see fig. 1 and 2, and the arrow in the figure is the whole flow path from entering into a reaction negative main body 1 to the complete emission of purification treatment of waste gas, and the device comprises a reaction kettle main body 1, wherein a filter chamber 2 is arranged in the reaction kettle main body 1, a liquid ammonia nozzle 3 is arranged below the filter chamber 2, and a catalytic reaction chamber 4 is arranged above the filter chamber 2. Ammonia is taken as a reducing agent, and the NOx is reduced into N by the liquid ammonia sprayed out by the liquid ammonia nozzle 3 under the action of a low-temperature catalyst of the catalytic reaction chamber 4 by means of the temperature of the exhaust gas discharged by the bright furnace equipment ₂ And H ₂ And O, the waste gas removal of the lighting furnace equipment is completed. The present device is described in detail below with reference to the drawings.

In this embodiment, a plurality of cylindrical ceramic filter elements 20 are disposed in the filter chamber 2, a gas channel is formed in the middle of the ceramic filter elements 20, a notch for gas to enter and exit is also formed in the side wall of the ceramic filter elements 20, a certain requirement is also provided for placing a plurality of ceramic filter elements 20, the single ceramic filter elements 20 are placed horizontally along the axial direction of the tube (i.e. in a vertical state with the direction of discharging NOx gas at the NOx gas discharge port 5), a plurality of ceramic filter elements are transversely arranged and stacked in a plurality of rows are disposed in the filter chamber 2, and the purpose of the arrangement in this way is to make the NOx gas and ammonia pass back and forth therebetween, increase the passing path, make the gas mixing more sufficient, and make the NOx gas obtain more sufficient reduction in the SCR catalytic system 40. Secondly, the running speed of the mixed gas of the NOx gas and the ammonia gas is slowed down by the damping of the ceramic filter element 20, the reduction time is more sufficient and the reaction is more sufficient after the mixed gas enters the SCR catalytic system 40, and the reaction efficiency of the NOx gas and the ammonia gas can be greatly improved, so that the NOx gas is effectively filtered.

In this embodiment, an SCR catalytic system 40 is disposed in the catalytic reaction chamber 4, where the SCR catalytic system 40 is a catalytic reaction zone formed by a honeycomb-shaped low-temperature catalyst, and is used for providing a catalyst required in the reaction, and reducing nitric oxide and nitrogen dioxide into nitrogen and water by combining ammonia and oxygen under the action of the catalyst, and the principle during the reduction is as follows:

the nitric oxide and the nitrogen dioxide can react with ammonia gas respectively or simultaneously to be converted into nitrogen and water, so that the effect of filtering out nitrogen oxides in waste gas is achieved, and the formed nitrogen and water meet the emission standard and can be directly discharged outdoors.

Specifically, the bottom of the reaction kettle main body 1 is provided with an NOx gas discharge inlet 5, the NOx gas discharge inlet 5 is communicated with an exhaust gas discharge outlet of the bright furnace equipment, exhaust gas generated by the bright furnace equipment is discharged from the NOx gas discharge inlet 5 and enters the reaction kettle main body 1, the temperature of the discharged exhaust gas is between 200 ℃ and 250 ℃, the temperature requirement of the low-temperature SCR catalytic system 40 for reducing the NOx gas can be just met, the top of the reaction kettle main body 1 is provided with a purified gas discharge outlet 6, the purified gas discharge outlet 6 is arranged right above the reaction kettle main body 1 in the embodiment, nitrogen and water vapor generated by the NOx gas after catalytic reduction can be rapidly discharged from the purified gas discharge outlet 6, the purified gas discharge outlet 6 is communicated with an overhead discharge chimney 7, and the purified gas is finally discharged outdoors through the overhead discharge chimney 7.

Further preferably, the heat carried by the waste gas and the heat generated by the generated vapor are more during the reaction, and the condensing device 8 is arranged between the purified gas discharge port 6 and the high-altitude discharge chimney 7, and the condensing device 8 can condense and intercept the heat carried by the waste gas of the reaction kettle main body 1 and the vapor generated during the reaction.

It should be noted that, the injection end of the liquid ammonia nozzle 3 is set up to the inside of the reaction kettle main body 1, the tail end needs to be connected with the liquid ammonia storage tank, the liquid ammonia nozzle 3 is set up in the lower half section area of the reaction kettle main body 1, the quantity is also provided with three specifications according to the exhaust gas quantity that NOx gas exhaust port 5 discharged, including symmetrically distributed on the left and right sides of the reaction kettle main body 1 totally four sides, the reaction kettle main body 1 totally three on the apex of the inscription equilateral triangle of the reaction kettle main body 1, this embodiment adopts the design mode of two liquid ammonia nozzles 3, during liquid ammonia blowout, exhaust gas also gets into at NOx gas exhaust port 5 simultaneously, through the baking of the high temperature of exhaust gas, the rapid gasification of heating, for entering into SCR catalytic system 40 has prepared earlier stage.

Specifically, when the bright furnace equipment works, waste gas is generated, the waste gas enters the reaction kettle main body 1 through the NOx gas exhaust inlet 5, simultaneously, the valves of all liquid ammonia nozzles 3 are opened, liquid ammonia is sprayed into the reaction kettle main body 1, the waste gas is baked at high temperature and heated and gasified rapidly to become ammonia, the ammonia and the waste gas carrying nitrogen oxides pass through the filter chamber 2, NOx gas and ammonia back and forth in the middle, the passing path is increased, so that the gas is mixed more fully, the running speed of the mixed gas of the NOx gas and the ammonia is slowed down, the mixed gas enters the catalytic reaction chamber 4 after the mixing is finished, the NOx gas and the ammonia react rapidly through the catalyst of the SCR catalytic system 40, the nitrogen gas and the water are reduced, finally, the waste gas is discharged through the purified gas exhaust outlet 6, and the purified gas is discharged up to the standard through the high-altitude discharge chimney 7 after condensation and dehydration.

Claims

1. The utility model provides a NOx processing apparatus for bright stove equipment, its characterized in that includes reation kettle main part (1), reation kettle main part (1) inside is provided with filter chamber (2), filter chamber (2) below is provided with liquid ammonia nozzle (3), filter chamber (2) top is provided with catalytic reaction room (4).

2. A NOx treatment device for a furnace installation according to claim 1, characterized in that a plurality of cylindrical ceramic filter elements (20) are arranged in the filter chamber (2).

3. A NOx treatment device for a furnace installation according to claim 2, characterized in that a plurality of ceramic filter elements (20) are laid flat in the filter chamber (2) in the direction of the tube axis.

4. A NOx treatment device for a light furnace installation according to claim 1, characterized in that an SCR catalytic system (40) is arranged in the catalytic reaction chamber (4), the SCR catalytic system (40) being a catalytic reaction zone consisting of a honeycomb-shaped low-temperature catalyst.

5. The NOx treatment device for a bright stock apparatus according to any one of claims 1 to 4, wherein the bottom of the reaction kettle body (1) is provided with a NOx gas discharge port (5), the top of the reaction kettle body (1) is provided with a purge gas discharge port (6), the purge gas discharge port (6) is provided directly above the reaction kettle body (1), and the purge gas discharge port (6) is communicated with a high-altitude discharge chimney (7).

6. A NOx treatment device for a furnace installation according to claim 5, characterized in that the NOx gas discharge inlet (5) communicates with the exhaust gas discharge of the furnace installation.

7. A NOx treatment device for a light furnace installation according to claim 6, characterized in that a condensing device (8) is arranged between the purge gas discharge opening (6) and the overhead discharge chimney (7).

8. A NOx treatment device for a bright stove apparatus according to claim 5, characterized in that the gas temperature t discharged by the NOx gas discharge inlet (5) is such that: t is less than 250 ℃ and 200 ℃.

9. The NOx treatment device for a bright stove apparatus according to claim 1, wherein the number of the liquid ammonia nozzles (3) can be symmetrically distributed on the left and right sides of the reaction vessel main body (1) or on the vertices of four front, rear, left and right or inscribed equilateral triangles according to the injection quantity.

10. A NOx treatment device for a bright stock plant according to claim 9, characterized in that the liquid ammonia nozzle (3) is in communication with a liquid ammonia storage tank.