An ozone injection device for ozone denitrification

Abstract

The ozone injection device for ozone denitrification provided by the present invention relates to the technical field of flue gas purification, and comprises a main pipe, a plurality of branch pipes connected to the main pipe and arranged in parallel and at equal intervals, a first fixed frame and a plurality of baffles arranged on the first fixed frame, and any branch pipe is axially and vertically provided with a plurality of injection pipes, and the positions and numbers of the baffles correspond to the injection pipes one by one; the nozzles of the injection pipes face the baffles, and the injection direction of the nozzles is the same as the inflow direction of the flue gas; after the ozone is ejected from the nozzle of the device of the present invention, it is blocked by the baffle to form a strong disturbance, thereby achieving full mixing of the ozone and the flue gas, fully treating the flue gas, and improving the efficiency of ozone denitrification.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas purification, and in particular to an ozone injection device for ozone denitrification. Background Art

[0002] Ozone oxidation flue gas denitrification technology is a mature engineering application technology abroad and has entered the stage of industrial application. Its application in China has just started. Ozone denitrification mainly uses the strong oxidizing property of ozone to oxidize insoluble low-valent nitrogen oxides into soluble high-valent nitrogen oxides, and then absorbs the nitrogen oxides in the scrubber to achieve the purpose of removal.

[0003] With the improvement of my country's environmental protection standards, some traditional flue gas denitrification processes are difficult to meet the strict emission reduction requirements, and ozone oxidation denitrification technology has become a better choice. The use of ozone advanced oxidation technology not only has a good removal effect on nitrogen oxides, but also has a certain removal ability for other harmful pollutants in flue gas, such as heavy metal mercury. Ozone denitrification can not only remove some high-concentration nitrogen oxide pollutants, but more importantly, it will not limit the normal operation of other pollution control systems, and can ensure that it can be combined with traditional denitrification technology or even directly replaced. The demand for flue gas denitrification in my country's petroleum and petrochemical industry is huge, and the contract price of a single set of equipment is high. Oxidation denitrification technology has been maturely applied in the petrochemical industry and achieved good results.

[0004] Looking at the current flue gas denitrification market in my country, the most widely used technologies include SCR and SNCR, which advocate the use of nitrogen water and urea to combine catalysts with NO in flue gas under high temperature conditions. X Produce redox reaction, thereby making NO X Smoothly reduced to nitrogen and water, but both of these technical modes have certain limitations. Although the SCR denitrification level is higher, it needs to be carried out at a reaction temperature of up to 450°C, and the whole process will consume a large amount of NH4 and catalysts, and need to match more technical equipment, and the investment cost is really high; while the SNCR reaction temperature is around 1000°C, and a large amount of reducing agent will also be consumed internally under synchronous conditions, and NO X The removal rate can only be maintained at around 40%. Through comparison, it is found that both types of technologies have many restrictive conditions in terms of temperature window and removal efficiency. Especially for small and industrial boilers, the exhaust flue gas temperature often cannot smoothly meet the temperature conditions required for the SCR reaction. In addition, the SNCR reaction efficiency is too low, which often leads to the negative phenomenon that the on-site flue gas emissions are difficult to meet the standards. Ozone oxidation denitrification technology eliminates many challenges and difficulties in the application of traditional boiler processes. Summary of the invention

[0005] The present invention aims to provide an ozone injection device for ozone denitrification, which solves the problem of NO in the prior art flue gas denitrification by providing a device that allows ozone and flue gas to be fully mixed in a short time. X The technical problem of low removal rate is solved by greatly improving the efficiency of ozone denitrification.

[0006] To achieve the above-mentioned object, the present invention proposes the following technical solution: an ozone injection device for ozone denitrification, comprising a main pipe, a plurality of mutually parallel branch pipes connected to the main pipe, a first fixed frame and a plurality of baffles;

[0007] The inflow direction of the smoke in the smoke duct is defined as the Z-axis direction of the three-dimensional coordinate system, and the main pipe is arranged in the Y-axis direction of the three-dimensional coordinate system, and the branch pipe is arranged in the X-axis direction of the three-dimensional coordinate system;

[0008] The main pipe is arranged outside the flue gas duct, and a main pipe fixing seat is arranged on the outer wall of the flue gas duct, and the main pipe fixing seat is fixedly connected to the main pipe; the branch pipes are evenly arranged along the extension direction of the main pipe, one end of the branch pipe passes through the outer wall of the main pipe and is connected to the inside of the main pipe, and the other end of the branch pipe passes through the outer wall of the flue gas duct and extends into the flue gas duct; a plurality of injection pipes are arranged on the side of the branch pipe away from the flue gas inflow direction, and the injection pipes are evenly arranged on the same straight line along the length direction of the branch pipe, and the nozzle direction of the injection pipe is the same as the flue gas inflow direction;

[0009] The first fixed frame is arranged in the smoke duct and is located on the nozzle side of the injection pipe; the first fixed frame includes a plurality of first fixed rods parallel to the branch pipes, both ends of the first fixed rods are respectively connected to the inner wall of the smoke duct, and the number of the first fixed rods is the same as the number of the branch pipes; any of the first fixed rods is provided with a plurality of baffles connected to the first fixed rods along its length direction, the baffles are located between the nozzle and the first fixed rods, the plate surface of the baffles is perpendicular to the Z axis, and the baffles connected to any of the first fixed rods correspond one to one to the nozzle position and number of the injection pipe on the branch pipe.

[0010] Furthermore, an automatic flow regulating valve is provided on the pipe section of any branch pipe located outside the flue gas duct.

[0011] Furthermore, the baffle is a star-shaped baffle, and the nozzle of the injection pipe and the center of the star-shaped baffle are located on the same straight line.

[0012] Furthermore, the ozone injection device also includes a second fixed frame, which is arranged in the flue gas duct and located on the side of the branch pipe close to the flue gas inlet; the first fixed frame includes a plurality of second fixed rods parallel to the main pipe, the two ends of the second fixed rods are respectively connected to the inner wall of the flue gas duct, and the second fixed rods are connected to each branch pipe in turn.

[0013] Furthermore, the baffle is arranged on the branch pipe, and the baffle surface is perpendicular to the Z axis; a connecting rod along the Z axis direction is arranged between two adjacent injection pipes on the branch pipe, and any connecting rod is connected to a baffle, and the center of the baffle is located on the same straight line as the nozzle of the injection pipe;

[0014] The distance between the baffle plate surface and the branch pipe along the Z-axis direction is defined as H1, and the distance between the nozzle of the injection pipe and the branch pipe along the Z-axis direction is defined as H2, H1>H2.

[0015] Furthermore, the injection pipe is an injection port arranged on the branch pipe.

[0016] Furthermore, the inner diameter of the nozzle of the injection pipe is 1-5 mm.

[0017] Furthermore, the diameter of the circumscribed circle of the star-shaped baffle is 5-10 mm.

[0018] Furthermore, the spacing between two adjacent injection pipes on the branch pipe and the spacing between two adjacent baffles on the first fixing rod are both 4-10 mm.

[0019] Furthermore, the main pipe fixing seat includes two pairs of fixing columns arranged at intervals along the Y-axis direction and a fixing plate connected to the fixing columns on the side away from the smoke duct; the plate surface of the fixing plate away from the side of the smoke duct is provided with a plurality of clamps, and the clamps are clamped on the main pipe in sequence along the Y-axis direction.

[0020] It can be seen from the above technical solutions that the ozone injection device for ozone denitrification provided by the technical solution of the present invention has the following beneficial effects:

[0021] The ozone injection device for ozone denitrification disclosed in the present invention comprises a main pipe, a plurality of parallel and equally spaced branch pipes connected to the main pipe, a first fixed frame and a plurality of baffles arranged on the first fixed frame; wherein the main pipe is arranged outside the flue gas duct, the branch pipe part is deeply inside the flue gas duct, and a plurality of injection pipes are arranged vertically axially on any branch pipe, and the injection direction of the injection pipe nozzle is the same as the flue gas inflow direction; the first fixed frame is arranged in the flue gas duct, the position and number of the baffles on the first fixed frame correspond to the position and number of the injection pipes, and the nozzle of the injection pipe faces the baffle, and the baffle surface is in the flue gas inflow direction; after the ozone is ejected from the nozzle, it is blocked by the baffle and forms a strong disturbance with the flue gas, so as to achieve full mixing of ozone and flue gas. The device of the present invention has a simple structure, ingenious design, convenient use, strong ozone injection force, uniform injection range, and can fully mix ozone and flue gas in a short time, so as to achieve the effect of fully treating the flue gas and improve the efficiency of ozone denitrification.

[0022] In addition, the present invention sets the structure of the baffle as a star-shaped baffle, and the specific technical effects include: 1) the flue gas enters the flue, and after passing through the star-shaped baffle, a small vortex is formed on the baffle, which is evenly mixed with the ozone injected from above, thereby increasing the mixing contact time; 2) the evenly mixed gas passes through the two star-shaped baffle holes and flows along the gap. The star-shaped baffle is conducive to the flow of gas in the gaps between corners and edges to increase the contact time and reduce the pressure drop at the same time; 3) when the star-shaped baffle is installed, the position between corners can be staggered to adjust, so that the arrangement is tighter and more conducive to the full mixing of ozone and flue gas.

[0023] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0024] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0026] Figure 1 The overall structure of the ozone injection device of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 2 The overall structure of the ozone injection device of the present invention is shown in FIG. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the ozone injection device of the present invention in use.

[0029] In the figure, the specific meaning of each mark is as follows:

[0030] 1-automatic flow regulating valve; 2-main pipe; 3-first fixed frame; 4-branch pipe; 5-star baffle; 6-nozzle, 7-second fixed frame, 8-smoke duct. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meaning understood by people with general skills in the field to which the present invention belongs.

[0032] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the features, wholes, steps, operations, elements and / or components listed after "include" or "comprise", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] In the flue gas denitrification market based on existing technologies, both SCR and SNCR technologies used for denitrification use nitrogen water and urea to combine catalysts with NO in flue gas under high temperature conditions. X There are many technical solutions for flue gas denitrification, but they all have disadvantages in specific applications. The application of ozone denitrification technology can solve the problems of the above-mentioned SCR and SNCR denitrification technologies. The present invention aims to propose an ozone injection device for ozone denitrification, which is applied in the process of flue gas denitrification, and uses a baffle to block the flue gas to achieve full mixing of flue gas and ozone in a short time, thereby improving the efficiency of ozone denitrification.

[0034] The ozone injection device for ozone denitrification of the present invention is further specifically described below in conjunction with the embodiments shown in the accompanying drawings.

[0035] Combination Figure 2 and Figure 3 The ozone injection device for ozone denitrification shown comprises a main pipe 2, a plurality of mutually parallel branch pipes 4 connected to the main pipe 2, a first fixed frame 3 and a plurality of baffles;

[0036] The inflow direction of the flue gas in the flue gas duct 8 is defined as the Z-axis direction of the three-dimensional coordinate system, then the main pipe 2 is arranged in the Y-axis direction of the three-dimensional coordinate system, and the branch pipe 4 is arranged in the X-axis direction of the three-dimensional coordinate system; the main pipe 2 is arranged outside the flue gas duct 8, and a main pipe fixing seat is arranged on the outer wall of the flue gas duct 8, and the main pipe fixing seat is fixedly connected to the main pipe 2; the branch pipes 4 are evenly arranged along the extension direction of the main pipe 2, one end of the branch pipe 4 penetrates the outer wall of the main pipe 2 and is connected to the inside of the main pipe 2, and the other end of the branch pipe 4 penetrates the outer wall of the flue gas duct 8 and extends into the flue gas duct 8; a plurality of injection pipes are arranged on the side of the branch pipe 4 away from the flue gas inflow direction, and the injection pipes are evenly arranged on the same straight line along the length direction of the branch pipe 4, and the nozzle direction of the injection pipe is the same as the flue gas inflow direction.

[0037] The first fixed frame 3 is arranged in the flue gas duct 8, and is located on the nozzle side of the injection pipe; the first fixed frame 3 includes a plurality of first fixed rods parallel to the branch pipe 4, and the two ends of the first fixed rods are respectively connected to the inner wall of the flue gas duct 8, and the number of the first fixed rods is the same as the number of the branch pipes 4; a plurality of baffles connected to the first fixed rods are arranged along the length direction of any first fixed rod, and the baffles are located between the nozzle and the first fixed rod, and the plate surface of the baffles is perpendicular to the Z axis, and the baffles connected to any first fixed rod correspond to the nozzle position and number of the injection pipe on the branch pipe, that is, the setting spacing of two adjacent baffles on the first fixed rod is also 4-10mm. When the flue gas flows in, the nozzle starts to spray ozone, and the flue gas is blocked by the baffle to form a backflow, forming a small vortex and ozone fully and evenly merging, further increasing the ozone and contact time, so as to achieve the purpose of improving the flue gas denitrification efficiency. In addition, since the injection direction of the ozone in the flue gas duct 8 is consistent with the flow direction of the flue gas, the nozzle of the injection pipe will not be blocked.

[0038] like Figure 1 As shown, in the embodiment, in order to facilitate the adjustment of the amount of flue gas injected into the flue gas duct 8, an automatic flow regulating valve is provided on the pipe section of any branch pipe 4 located outside the flue gas duct 8 to achieve the adjustment of the flue gas flow rate in the branch pipe 4. In some embodiments, the flue gas flow of all branch pipes 4 is also adjusted directly by providing an automatic flow regulating valve on the main pipe 2. In order to ensure that the ozone sprayed from the injection pipe is fully and evenly mixed with the flue gas, the injection pipes are arranged at equal intervals on the branch pipe 4, generally 4-10mm, and the inner diameter of the nozzle is 1-5mm to ensure the speed of ozone when it is sprayed from the nozzle. In addition, in some embodiments, in order to simplify the structure of the injection device for ozone denitrification and avoid installing the injection pipe on the branch pipe 4, the embodiment directly provides a plurality of injection ports on the branch pipe 4, and uses the injection port as the injection pipe to inject ozone; this type of implementation also requires the diameter of the injection port to be 1-5mm.

[0039] As shown in the attached embodiment Figure 3As shown, the main pipe fixing seat includes two pairs of fixing columns spaced apart along the Y-axis direction and a fixing plate connected to the fixing columns away from the smoke pipe 8. The fixing plate away from the smoke pipe 8 is provided with a plurality of clamps on the plate surface. The clamps are sequentially clamped on the main pipe 2 along the Y-axis direction. The clamp fixing method can be quickly disassembled and adjusted. The main pipe fixing seat is only a fixing structure proposed in the embodiment of the present invention. The present invention is not limited to this structure. All structures that can achieve the fixing of the main pipe 2 and the smoke pipe 8 should be within the protection scope of this application.

[0040] Further integration Figure 3 The use diagram of the flue gas denitrification device shown in the embodiment shows that the baffle used is a star-shaped baffle 5, the diameter of the circumscribed circle of the star-shaped baffle 5 is 5-10mm, and the nozzle of the injection pipe is located on the same straight line as the center of the star-shaped baffle 5. The specific reason is not only that after the flue gas enters the flue and is blocked by the star-shaped baffle 5, a small vortex is formed above the star-shaped baffle 5, which is evenly mixed with the ozone injected from above, increasing the mixing contact time, but also includes that when the gas evenly mixed with ozone and flue gas passes between the two star-shaped baffle holes 5, it flows along the gap, and the star-shaped baffle 5 is conducive to the flow of gas in the gap between the corners and the edges to increase the contact time and reduce the pressure drop; at the same time, when the star-shaped baffle 5 is installed, the position can be staggered between the corners, so that the arrangement is tighter and more conducive to the full mixing of ozone and flue gas. In some embodiments, in order to facilitate the exhaust of flue gas and ozone after even mixing in the later stage, the star-shaped baffle 5 is installed in an inclined manner, that is, a rotating angle installation method.

[0041] Further integration Figure 1 As shown, the ozone injection device in the embodiment also includes a second fixed frame 7, which is arranged in the flue gas duct 8 and is located on the side of the branch pipe 4 close to the flue gas inflow; the first fixed frame 3 includes a plurality of second fixed rods parallel to the main pipe 2, both ends of the second fixed rods are respectively connected to the inner wall of the flue gas duct 8, and the second fixed rods are connected to each branch pipe 4 in sequence; the second fixed frame 7 is arranged as a fixed rod structure staggered with the branch pipe 4, which is used to reinforce the branch pipe 4 on the one hand, and will not affect the flow of flue gas on the other hand.

[0042] In some embodiments, the baffle is fixed to the first fixing frame 3, and the baffle is directly arranged on the branch pipe 4, such as Figure 2 As shown. A connecting rod along the Z-axis direction is provided between two adjacent injection pipes on any branch pipe 4, and any connecting rod is connected to a baffle, the baffle surface is perpendicular to the Z-axis, and the center of the baffle is located on the same straight line as the nozzle of the injection pipe; the distance between the baffle surface and the branch pipe 4 along the Z-axis direction is defined as H1, and the distance between the nozzle of the injection pipe and the branch pipe along the Z-axis direction is defined as H2, H1>H2. That is, the baffle is set at the rear side of the smoke inflow direction to avoid the situation where the baffle and the nozzle do not correspond, so that the blocked smoke is fully mixed in the area between the nozzle and the baffle.

[0043] The ozone injection device for ozone denitrification of the present invention adopts a star-shaped baffle perpendicular to the flue gas inflow direction and an ozone injection direction which is the same as the flue gas inflow direction, so as to realize that the flue gas and ozone form a strongly disturbed vortex, thereby achieving the technical effect of uniform mixing and full contact between the ozone and the flue gas, thereby effectively improving the efficiency of ozone denitrification; the device has an ingenious structure, is easy to use, has a strong ozone injection force, and a uniform injection range, and can be used in any flue gas denitrification scenario, and has a wide range of applications.

[0044] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An ozone injection device for ozone denitrification, characterized in that: It includes a main pipe, a plurality of parallel branch pipes connected to the main pipe, a first fixed frame and a plurality of baffles; The inflow direction of the smoke in the smoke duct is defined as the Z-axis direction of the three-dimensional coordinate system, and the main pipe is arranged in the Y-axis direction of the three-dimensional coordinate system, and the branch pipe is arranged in the X-axis direction of the three-dimensional coordinate system; The main pipe is arranged outside the flue gas duct, and a main pipe fixing seat is arranged on the outer wall of the flue gas duct, and the main pipe fixing seat is fixedly connected to the main pipe; the branch pipes are evenly arranged along the extension direction of the main pipe, one end of the branch pipe passes through the outer wall of the main pipe and is connected to the inside of the main pipe, and the other end of the branch pipe passes through the outer wall of the flue gas duct and extends into the flue gas duct, and an automatic flow regulating valve is arranged on the pipe section of any branch pipe located outside the flue gas duct; a plurality of injection pipes are arranged on the side of the branch pipe away from the flue gas inflow direction, and the injection pipes are evenly arranged on the same straight line along the length direction of the branch pipe, and the nozzle direction of the injection pipe is the same as the flue gas inflow direction; The first fixed frame is arranged in the smoke duct and is located at the nozzle side of the injection pipe; the first fixed frame includes a plurality of first fixed rods parallel to the branch pipes, the two ends of the first fixed rods are respectively connected to the inner wall of the smoke duct, and the number of the first fixed rods is the same as the number of the branch pipes; any of the first fixed rods is provided with a plurality of baffles connected to the first fixed rods along its length direction, the baffles are located between the nozzle and the first fixed rods, the plate surface of the baffles is perpendicular to the Z axis, and the baffles connected to any of the first fixed rods correspond to the nozzle positions and numbers of the injection pipes on the branch pipes one by one; The baffle is a star-shaped baffle, and the nozzle of the injection pipe and the center of the star-shaped baffle are located on the same straight line.

2. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The ozone injection device also includes a second fixed frame, which is arranged in the flue gas duct and located on the side of the branch pipe close to the flue gas inflow; the first fixed frame includes a plurality of second fixed rods parallel to the main pipe, the two ends of the second fixed rods are respectively connected to the inner wall of the flue gas duct, and the second fixed rods are connected to each branch pipe in sequence.

3. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The baffle is arranged on the branch pipe, and the surface of the baffle is perpendicular to the Z axis; a connecting rod along the Z axis is arranged between two adjacent injection pipes on the branch pipe, and any of the connecting rods is connected to a baffle, and the center of the baffle is located on the same straight line as the nozzle of the injection pipe; The distance between the baffle plate surface and the branch pipe along the Z-axis direction is defined as H1, and the distance between the nozzle of the injection pipe and the branch pipe along the Z-axis direction is defined as H2, H1>H2.

4. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The injection pipe is an injection port arranged on the branch pipe.

5. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The inner diameter of the nozzle of the injection pipe is 1-5 mm.

6. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The diameter of the circumscribed circle of the star-shaped baffle is 5-10 mm.

7. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The spacing between two adjacent injection pipes on the branch pipe and the spacing between two adjacent baffles on the first fixing rod are both 4-10 mm.

8. The ozone injection device for ozone denitrification according to claim 1, characterized in that: The main pipe fixing seat includes two pairs of fixing columns spaced apart along the Y-axis direction and a fixing plate connected to the fixing columns away from the smoke duct side; a plate surface of the fixing plate away from the smoke duct side is provided with a plurality of clamps, and the clamps are clamped on the main pipe in sequence along the Y-axis direction.

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