CN217042068U - A denitration and efficiency improvement device based on SCR reactor lift and urea direct injection technology - Google Patents

Abstract

The utility model discloses a denitration efficiency-improving device based on SCR reactor lifting and urea direct injection technology, a newly-increased catalyst layer stand column is vertically fixed on an original denitration reactor stand column, an original reactor shell is fixed on the side surface of the original denitration reactor stand column, a newly-increased reactor shell is fixed on the side surface of a newly-increased catalyst layer stand column, the bottom of the newly-increased reactor shell is communicated with the top of the original reactor shell, a structural framework is fixed in the newly-increased reactor shell, and a newly-increased catalyst is positioned on the structural framework; the outlet of the original SCR inlet flue is communicated with the inlet of the newly-added SCR inlet flue, the outlet of the newly-added SCR inlet flue is communicated with the top inlet of the newly-added reactor shell through the reactor top cover and the top original flue, and the device can meet the requirement of ultra-low emission.

Description

A denitration and efficiency enhancement device based on SCR reactor lift and urea direct injection technology

technical field

The utility model belongs to the field of ultra-low emission environmental protection transformation of coal-fired power plants, and relates to a denitration and efficiency improvement device based on the lifting of an SCR reactor and the direct injection of urea.

Background technique

At present, SCR denitration technology has become the most widely used and mature flue gas purification technology for coal-fired power plants to fully implement ultra-low emissions of air pollutants. SCR denitration technology has high denitration efficiency (up to 90%), low secondary pollution, The technology is mature and reliable.

In most domestic coal-fired power plants, the number of catalyst layers for SCR denitration process in the initial stage of environmental protection transformation is arranged in a "2+1" mode, with 2 layers initially installed and 1 layer reserved. Some "W" flame boilers in the early stage of environmental protection transformation of SCR denitration process catalysts The number of layers is arranged according to the pattern of "initial installation of 3 layers and reservation of 1 layer. In the initial stage of denitration design, liquid ammonia is basically used as a reducing agent for SCR denitration reaction, and the NOx emission concentration is controlled within 200mg/ ^m3 . With the environmental protection situation The country has issued an ultra-low emission standard to control the NOx emission concentration at 50mg/m ³ , and some regions have issued a policy requirement to control the NOx emission concentration at 30 mg/m ³ . Therefore, the denitrification efficiency of the original denitrification device cannot be achieved. To meet the ultra-low emission requirements, environmental protection equipment must be upgraded to improve efficiency.

Utility model content

The purpose of this utility model is to overcome the above-mentioned shortcomings of the prior art, and to provide a denitration and efficiency enhancement device based on the SCR reactor lift and the urea direct injection technology, which can meet the requirements of ultra-low emission.

In order to achieve the above purpose, the denitration and efficiency improvement device based on the SCR reactor lifting and urea direct injection technology described in the present invention includes the original denitration reactor column, the newly added catalyst layer column, the newly added catalyst, the newly added reactor shell, Reactor top cover and top original flue, newly added SCR inlet flue, urea direct injection spray gun and urea direct injection spray gun distributor;

The new catalyst layer column is erected and fixed on the original denitration reactor column, the original reactor shell is fixed on the side of the original denitration reactor column, the newly added reactor shell is fixed on the side of the newly added catalyst layer column, and the new reaction is added. The bottom of the reactor shell is communicated with the top of the original reactor shell, the structural frame is fixed in the newly added reactor shell, and the newly added catalyst is located on the structural frame;

The outlet of the original SCR inlet flue is connected to the inlet of the newly added SCR inlet flue, and the outlet of the newly added SCR inlet flue is connected to the top inlet of the newly added reactor shell through the reactor top cover and the top original flue.

The bottom of the original SCR inlet flue is provided with several urea direct injection spray guns, wherein the outlet of the urea direct injection spray gun distributor is communicated with the inlet of each urea direct injection spray gun.

The structural frame includes four denitration catalyst supporting main beams and several denitration catalyst supporting sub-beams, wherein the four denitration catalyst supporting main beams form an annular frame, and each denitration catalyst supporting sub-beam is fixed in the annular frame.

The supporting secondary beams of each denitration catalyst are parallel and equally spaced.

The urea direct injection guns are distributed in formation.

The injection direction of each urea direct injection gun is the same as the flow direction of the flue gas.

The axis of the new reactor shell is on the same line as the axis of the original reactor shell.

The structural frame is welded and fixed in the newly added reactor shell.

Each denitration catalyst supporting secondary beam is welded and fixed in the annular frame.

The utility model has the following beneficial effects:

The denitration and efficiency improvement device based on the SCR reactor lifting and the urea direct injection technology of the utility model fully utilizes the vertical space during the specific operation, and the original reactor shell is fixedly connected to the new reactor shell, and then the new reactor shell is connected to the original reactor shell. A new catalyst is added in the reactor shell to realize the SCR denitration process from 3 layers of catalysts to 4 layers of catalysts running at the same time. In addition, a urea direct injection gun is used on the original SCR inlet flue to achieve the purpose of reducing agent capacity expansion.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

Among them, 1 is the original denitration reactor column, 2 is the newly added catalyst layer column, 3 is the denitration catalyst supporting main beam, 4 is the denitration catalyst supporting secondary beam, 5 is the newly added catalyst, 6 is the newly added reactor shell, 7 It is the top cover of the reactor and the original flue at the top, 8 is the newly added SCR inlet flue, 9 is the urea direct injection spray gun, and 10 is the urea direct injection spray gun distributor.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the disclosure of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The accompanying drawings show a schematic structural diagram of an embodiment according to the disclosure of the present invention. The figures are not to scale, some details have been exaggerated for clarity, and some details may have been omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art should Regions/layers with different shapes, sizes, relative positions can be additionally designed as desired.

Referring to FIG. 1 , the denitration and efficiency improvement device based on SCR reactor lifting and urea direct injection technology according to the present utility model includes the original denitration reactor column 1, the newly added catalyst layer column 2, the denitration catalyst support main beam 3, the denitration catalyst support Secondary beam 4, new catalyst, new reactor shell 6, reactor top cover and top original flue 7, new SCR inlet flue 8, urea direct injection spray gun 9 and urea direct injection spray gun distributor 10;

The newly added catalyst layer column 2 is erected and fixed on the original denitration reactor column 1, the original reactor shell is fixed on the side of the original denitration reactor column 1, and the newly added reactor shell 6 is fixed on the side of the newly added catalyst layer column 2. , and the bottom of the newly added reactor shell 6 is communicated with the top of the original reactor shell, the structural frame is fixed in the newly added reactor shell 6, and the newly added catalyst 5 is located on the structural frame, and the structural frame includes Four denitration catalyst supporting main beams 3 and several denitration catalyst supporting secondary beams 4, wherein the four denitration catalyst supporting main beams 3 form an annular frame, and each denitration catalyst supporting sub beam 4 is fixed in the annular frame.

The outlet of the original SCR inlet flue is connected with the inlet of the newly added SCR inlet flue 8, and the outlet of the newly added SCR inlet flue 8 is connected to the top of the newly added reactor shell 6 through the reactor top cover and the top original flue 7 The entrance is connected.

The bottom of the original SCR inlet flue is provided with several urea direct injection spray guns 9 , wherein the outlet of the urea direct injection spray gun distributor 10 is communicated with the inlet of each urea direct injection spray gun 9 .

It should be noted that the utility model has the following characteristics:

The utility model makes full use of the existing SCR device, and makes full use of the vertical space under the condition that the horizontal space cannot be expanded, so as to minimize the overall change and optimize the scheme.

In the utility model, the newly added catalyst layer column 2 is vertically connected to the original denitration reactor column 1, and the load of the newly added catalyst 5 is transferred through the newly added catalyst layer column 2 and finally collected to the denitration steel frame.

Compared with the traditional reducing agent liquid ammonia, the utility model selects urea as the reducing agent, and has the advantages of no ammonia leakage, no need for fire prevention, low operating cost and less floor space, and is non-toxic and harmless.

Compared with the traditional denitrification urea pyrolysis and hydrolysis process, the utility model can save the urea pyrolysis device and electric heating and other equipment by the flue urea pyrolysis direct injection ammonia production technology, further simplify the system equipment and reduce the energy consumption of urea ammonia production .

The urea solution prepared and metered by the utility model according to a certain proportion is distributed through the urea direct injection spray gun distributor 10 and then evenly distributed to each urea direct injection spray gun 9. The urea direct injection spray guns 9 are arranged in sequence at the bottom of the original SCR inlet flue, The urea droplets sprayed by the urea direct injection gun 9 flow in the same direction as the flue gas, and after fully mixing with the flue gas, they are heated in the original SCR inlet flue and decomposed into ammonia gas as the SCR reducing agent.

Finally, it should be noted that the technical idea of the present utility model is described above, and the protection scope of the present utility model cannot be limited by this. Any equivalent or simple changes made according to the structure, features and technical ideas described in the patent idea of the present utility model , are included in the protection scope of this utility model patent. Those skilled in the art to which the present invention pertains can make various modifications or additions to the specific examples described or substitute in similar ways, as long as they do not deviate from the structure of the present invention or go beyond the scope defined by the claims , should belong to the protection scope of the present utility model.

Claims (8)

1. A denitration efficiency-improving device based on SCR reactor lifting and urea direct injection technology is characterized by comprising an original denitration reactor upright post (1), a newly-added catalyst layer upright post (2), a newly-added catalyst, a newly-added reactor shell (6), a reactor top cover and a top original flue (7), a newly-added SCR inlet flue (8), a urea direct injection spray gun (9) and a urea direct injection spray gun distributor (10);

the newly added catalyst layer stand column (2) is vertically fixed on the original denitration reactor stand column (1), the original reactor shell is fixed on the side surface of the original denitration reactor stand column (1), the newly added reactor shell (6) is fixed on the side surface of the newly added catalyst layer stand column (2), the bottom of the newly added reactor shell (6) is communicated with the top of the original reactor shell, the structural framework is fixed in the newly added reactor shell (6), and the newly added catalyst (5) is positioned on the structural framework;

the outlet of the original SCR inlet flue is communicated with the inlet of a newly-added SCR inlet flue (8), and the outlet of the newly-added SCR inlet flue (8) is communicated with the top inlet of the newly-added reactor shell (6) through a reactor top cover and a top original flue (7);

the bottom of the original SCR inlet flue is provided with a plurality of urea direct injection spray guns (9), wherein the outlets of urea direct injection spray gun distributors (10) are communicated with the inlets of the urea direct injection spray guns (9).

2. The SCR reactor lift and urea direct injection technology-based denitration efficiency improvement device of claim 1, wherein the structural frame comprises four main denitration catalyst support beams (3) and a plurality of secondary denitration catalyst support beams (4), wherein the four main denitration catalyst support beams (3) form an annular frame, and each secondary denitration catalyst support beam (4) is fixed in the annular frame.

3. The SCR reactor lift and urea direct injection technology based denitration efficiency improving device of claim 2, wherein each denitration catalyst support secondary beam (4) is distributed in parallel and at equal intervals.

4. The SCR reactor lift and urea direct injection technology-based denitration efficiency-improving device as recited in claim 1, wherein each urea direct injection lance (9) is arranged in an array.

5. The denitration efficiency-improving device based on SCR reactor lifting and urea direct injection technology of claim 1, characterized in that the injection direction of each urea direct injection lance is the same as the flow direction of flue gas.

6. The denitration efficiency-improving device based on SCR reactor lifting and urea direct injection technology of claim 1, characterized in that the axis of the newly added reactor shell (6) and the axis of the original reactor shell are positioned on the same line.

7. The denitration efficiency-improving device based on SCR reactor lifting and urea direct injection technology of claim 1, characterized in that the structural frame is welded and fixed in the newly added reactor shell (6).

8. The SCR reactor lifting and urea direct injection technology-based denitration efficiency improving device as claimed in claim 2, wherein each denitration catalyst support secondary beam (4) is welded and fixed in the annular frame.

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