Desulfurization water bed with forced oxidation nozzle structure

Abstract

The utility model discloses a desulfurization water bed with a forced oxidation nozzle structure, which comprises a desulfurization water bed connected with a carbide slag slurry feeding pipeline; the flue gas pipeline is arranged above the desulfurization water bed, and a plurality of flue gas branch pipes are connected to the flue gas pipeline in the length direction of the flue gas pipeline; the forced oxidation spray pipe is transversely arranged in the desulfurization water bed and is positioned below the plurality of flue gas branch pipes, a pipe orifice of the forced oxidation spray pipe extends out of the desulfurization water bed, a plurality of nozzles are mounted on the forced oxidation spray pipe, and the plurality of nozzles are respectively arranged right opposite to pipe orifices at the lower ends of the plurality of flue gas branch pipes; an air outlet of the oxidation fan is connected with a pipe orifice of the forced oxidation spray pipe; and the mechanical stirrer is mounted in the desulfurization water bed and is positioned below the forced oxidation spray pipe. The nozzle can increase oxygen into the desulfurization water bed, and under the action of the mechanical stirrer, the oxygen, the flue gas and the desulfurization agent are fully mixed and react, so that the generation of calcium sulfite can be reduced, and the desulfurization effect can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization, and more specifically to a desulfurization water bed with a forced oxidation nozzle structure. Background Art

[0002] At present, sulfur dioxide is the largest pollutant causing air pollution in my country. Reducing sulfur dioxide emissions and reducing sulfur dioxide pollution in the atmosphere have become one of the important topics of environmental protection research in my country. With the increasingly stringent environmental protection requirements, desulfurization technology is also constantly deepening and developing. At the same time, the introduction of the "ultra-low emission" standard for flue gas has aggravated the environmental protection and operation pressure of thermal power plants. The main component of carbide slag is calcium hydroxide, which has a large surface area, good activity, strong desulfurization ability and is cheap and easy to obtain. It can be used to replace traditional desulfurizers for desulfurization and achieve the effect of treating waste with waste. However, the desulfurization process using carbide slag as a desulfurizer will produce calcium sulfite to block the pipeline due to insufficient oxidation, seriously affecting the safety of operation. In the desulfurization water bed, because its internal space is too small and the amount of oxygen introduced into the water bed cannot be guaranteed, no oxidation device is added, but the parameters of the carbide slag slurry in the water bed are adjusted to prevent the generation of calcium sulfite. However, in the actual operation process, the parameters change too fast, and there is a phenomenon of untimely control. Therefore, oxidation of calcium sulfite is an indispensable link.

[0003] After searching the prior art literature, it was found that patent CN217312707U discloses "a multi-tube water bed device for multi-stage desulfurization of flue gas". This utility model provides a multi-tube water bed device for multi-stage desulfurization of flue gas, which is characterized by small footprint, simple system, low equipment investment, reduced desulfurization cost, and a multi-stage desulfurization method, so that the final flue gas emissions meet ultra-low standards. However, because the internal space of the desulfurization water bed is too narrow, no oxidation device is added. Instead, the concentration and pH value of the calcium carbide slag slurry in the water bed are adjusted to prevent the formation of calcium sulfite. However, in the actual operation process, the parameters change too quickly, and there is a phenomenon of untimely control. It is difficult to avoid the occurrence of insufficient oxidation, which produces calcium sulfite and blocks the desulfurization device; Patent CN203577620U discloses "an oxidizing air distribution device for calcium desulfurization". The invention provides an oxidizing air distribution device for calcium desulfurization, which can make the air volume and air pressure of each air nozzle more uniform and stable, thereby improving the oxidation effect of calcium sulfite and the utilization rate of oxidizing air. However, the modification process of the device is complicated and the modification cost is high; Patent CN102172469A discloses "a composite flue gas purification additive for wet flue gas desulfurization system". The invention can strengthen the oxidation crystallization process of desulfurization by-products and increase the sulfite oxidation rate, thereby effectively overcoming the problem of insufficient oxidation of desulfurization products and ensuring system availability. However, the overall oxidation efficiency still needs to be improved and the desulfurization cost is high.

[0004] Therefore, how to provide a desulfurization water bed with a forced oxidation nozzle structure that can make the flue gas and desulfurization slurry react more thoroughly, improve the forced oxidation effect of calcium sulfite, and reduce the production of calcium sulfite, while having a simple modification process, low modification cost, and high oxidation efficiency is an urgent problem that technical personnel in this field need to solve. Utility Model Content

[0005] In view of this, the utility model aims at the problems existing in the prior art and provides a desulfurization water bed with a forced oxidation nozzle structure. The forced oxidation nozzle structure is arranged in the water bed, which can improve the uniformity of the desulfurization slurry and make the flue gas and the desulfurization slurry react more thoroughly. At the same time, the device has a simple modification process, low modification cost and high oxidation efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A desulfurization water bed with a forced oxidation nozzle structure, comprising:

[0008] A desulfurization water bed, wherein a carbide slag slurry feeding pipeline is connected to the desulfurization water bed;

[0009] A flue gas duct, wherein the flue gas duct is arranged above the desulfurization water bed, and a plurality of flue gas branch pipes are connected to the flue gas duct along the length direction of the flue gas duct, and the lower ends of the plurality of flue gas branch pipes extend into the interior of the desulfurization water bed;

[0010] A forced oxidation nozzle, the forced oxidation nozzle is arranged transversely inside the desulfurization water bed and below the plurality of flue gas branch pipes, the nozzle of the forced oxidation nozzle extends out of the desulfurization water bed, a plurality of nozzles are installed on the forced oxidation nozzle, and the plurality of nozzles are arranged opposite to the lower nozzles of the plurality of flue gas branch pipes respectively;

[0011] An oxidation fan, wherein the oxidation fan is arranged outside the desulfurization water bed, and an air outlet of the oxidation fan is connected to the nozzle of the forced oxidation nozzle;

[0012] A mechanical stirrer is installed inside the desulfurization water bed and is located below the forced oxidation nozzle.

[0013] It can be known from the above technical scheme that compared with the prior art, the utility model discloses a desulfurization water bed with a forced oxidation nozzle structure. The flue gas passes through the flue gas branch pipe on the flue gas pipeline and enters the desulfurization water bed to generate downward bubbles. At this time, the air distributed by the oxidation fan is sent into the desulfurization water bed through the nozzle on the forced oxidation nozzle to generate upward bubbles. Because the nozzle and the flue gas branch pipe are arranged opposite to each other, the two bubbles are mutually blended, collided and decomposed, so that the flue gas, oxygen and calcium carbide slag slurry are fully reacted and oxidized, thereby improving the desulfurization effect of sulfur dioxide in the flue gas and reducing the production of calcium sulfite, avoiding clogging of desulfurization equipment and slurry pipelines, and greatly reducing the occurrence of device failures during operation. A mechanical stirrer is installed at the bottom of the desulfurization water bed to fully stir the slurry, improve the desulfurization efficiency of the desulfurizer, and reduce the use cost of the desulfurizer. In addition, the desulfurization water bed has a simple structure, a simple transformation process, and a low transformation cost.

[0014] Further, the nozzle includes a first nozzle and a second nozzle, and the forced oxidation nozzle includes:

[0015] A first nozzle, the first nozzle is horizontally placed inside the desulfurization water bed and is located below the flue gas branch pipe, a plurality of the first nozzles are installed on the first nozzle, the plurality of the first nozzles are arranged opposite to the lower end nozzles of the plurality of flue gas branch pipes, respectively, a first nozzle of the first nozzle is located inside the desulfurization water bed, and a second nozzle of the first nozzle extends out of the desulfurization water bed and is connected to the air outlet of the oxidation fan;

[0016] The second nozzle is horizontally placed inside the desulfurization water bed and is located below the flue gas branch pipe. A plurality of the second nozzles are installed on the second nozzle. The plurality of the second nozzles are arranged opposite to the lower end pipe openings of the plurality of flue gas branch pipes respectively. The first pipe opening of the second nozzle is located inside the desulfurization water bed and is connected and communicated with the first pipe opening of the first nozzle. The second pipe opening of the second nozzle extends out of the desulfurization water bed and is connected to the air outlet of the oxidation fan.

[0017] The beneficial effect of adopting the above technical solution is: oxygen is transported to the inside of the desulfurization water bed through the first nozzle and the second nozzle at the same time, the oxygen supply is increased, and the oxidation effect of the carbide slag desulfurizer is improved.

[0018] Further, the first nozzle includes a plurality of first semicircular tubes and a plurality of first connecting straight tubes, the plurality of first semicircular tubes are connected and communicated through the first connecting straight tubes, the first semicircular tubes are mounted with the first nozzle, and the air outlet of the oxidation fan is connected to the pipe opening of the first connecting straight tube at the head end;

[0019] The second nozzle includes a plurality of second semicircular tubes and a plurality of second connecting straight tubes, the plurality of second semicircular tubes are connected and communicated through the second connecting straight tubes, the first connecting straight tube at the end is connected and communicated with the second connecting straight tube at the end, the second semicircular tube is installed with the second nozzle, and the air outlet of the oxidation fan is connected to the pipe mouth of the second connecting straight tube at the head end;

[0020] The first semicircular tube and the second semicircular tube are arranged to be spaced apart and face each other, and the center points of the first semicircular tube and the second semicircular tube are arranged to face the center point of the smoke branch pipe.

[0021] The beneficial effect of adopting the above technical scheme is: each pair of first semicircular tubes and second semicircular tubes corresponds to a flue gas branch pipe, so that the oxygen delivered by the first nozzle and the second nozzle on the first semicircular tube and the second semicircular tube completely surrounds the flue gas entering the water bed, ensuring that the flue gas fully and evenly contacts and reacts with the oxygen, thereby improving the oxidation effect of the carbide slag desulfurizer.

[0022] Furthermore, it also includes a carbide slag pulping pool arranged outside the desulfurization water bed, the carbide slag pulping pool is connected to the desulfurization water bed through the carbide slag slurry feeding pipeline, and the carbide slag slurry feeding pipeline is installed with a carbide slag slurry circulation pump.

[0023] The beneficial effect of adopting the above technical solution is that the carbide slag slurry in the carbide slag slurry pool can be pumped into the desulfurization water bed through the carbide slag slurry circulation pump, thereby realizing the automatic supply of desulfurizer (carbide slag slurry).

[0024] Furthermore, it also includes a carbide slag waste liquid pool arranged outside the desulfurization water bed, the bottom end of the desulfurization water bed is connected to the carbide slag waste liquid pool through a carbide slag waste liquid discharge pipe, and a carbide slag waste liquid discharge valve is installed on the carbide slag waste liquid discharge pipe.

[0025] The beneficial effect of adopting the above technical solution is: after desulfurization is completed, the carbide slag waste liquid discharge valve is opened, and the waste liquid in the desulfurization water bed is discharged into the carbide slag waste liquid pool through the carbide slag waste liquid discharge pipeline, realizing automatic discharge and collection of the waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1The utility model provides a structural schematic diagram of a desulfurization water bed with a forced oxidation nozzle structure.

[0028] Figure 2 The utility model is a schematic diagram of the top view of the forced oxidation nozzle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1-Figure 2 As shown, the utility model embodiment discloses a desulfurization water bed with a forced oxidation nozzle structure, comprising:

[0031] A desulfurization water bed 1, to which a carbide slag slurry feeding pipeline 2 is connected;

[0032] A flue gas duct 3 is arranged above the desulfurization water bed 1. The flue gas duct 3 is connected with a plurality of flue gas branch pipes 4 along the length direction of the flue gas duct 3. The lower ends of the plurality of flue gas branch pipes 4 extend into the desulfurization water bed 1.

[0033] A forced oxidation nozzle 5 is made of 304 stainless steel and is arranged transversely inside the desulfurization water bed 1 and below the multiple flue gas branch pipes 4. The nozzle of the forced oxidation nozzle 5 extends out of the desulfurization water bed 1. Multiple nozzles 6 are installed on the forced oxidation nozzle 5. The multiple nozzles 6 are arranged opposite to the lower nozzles of the multiple flue gas branch pipes 4 respectively.

[0034] The oxidation fan 7 is arranged outside the desulfurization water bed 1, and the air outlet of the oxidation fan 7 is connected to the nozzle of the forced oxidation nozzle 5;

[0035] The mechanical stirrer 8 is installed inside the desulfurization water bed 1 and is located below the forced oxidation nozzle 5 .

[0036] The nozzle 6 includes a first nozzle 61 and a second nozzle 62, and the forced oxidation nozzle 5 includes:

[0037] A first nozzle 51, which is horizontally placed inside the desulfurization water bed 1 and is located below the flue gas branch pipe 4. A plurality of first nozzles 61 are installed on the first nozzle 51. The plurality of first nozzles 61 are arranged opposite to the lower ends of the plurality of flue gas branch pipes 4. The first nozzle of the first nozzle 51 is located inside the desulfurization water bed 1. The second nozzle of the first nozzle 51 extends out of the desulfurization water bed 1 and is connected to the air outlet of the oxidation blower 7.

[0038] The second nozzle 52 is placed horizontally inside the desulfurization water bed 1 and is located below the flue gas branch pipe 4. A plurality of second nozzles 62 are installed on the second nozzle 52. The plurality of second nozzles 62 are arranged opposite to the lower end pipe openings of the plurality of flue gas branch pipes 4 respectively. The first pipe opening of the second nozzle 52 is located inside the desulfurization water bed 1 and is connected and communicated with the first pipe opening of the first nozzle 51. The second pipe opening of the second nozzle 52 extends out of the desulfurization water bed 1 and is connected to the air outlet of the oxidation fan 7.

[0039] The first nozzle 51 includes a plurality of first semicircular tubes 511 and a plurality of first connecting straight tubes 512. The plurality of first semicircular tubes 511 are connected and communicated with each other through the first connecting straight tubes 512. The first nozzle 61 is installed on the first semicircular tube 511. The air outlet of the oxidation fan 7 is connected to the pipe opening of the first connecting straight tube 512 at the head end.

[0040] The second nozzle 52 includes a plurality of second semicircular tubes 521 and a plurality of second connecting straight tubes 522. The plurality of second semicircular tubes 521 are connected and communicated with each other through the second connecting straight tubes 522. The first connecting straight tube 512 at the end is connected and communicated with the second connecting straight tube 522 at the end. The second semicircular tube 521 is provided with a second nozzle 62. The air outlet of the oxidation fan 7 is connected with the pipe mouth of the second connecting straight tube 522 at the head end.

[0041] The first semicircular tube 511 and the second semicircular tube 521 are arranged opposite to each other at intervals, and the center points of the first semicircular tube 511 and the second semicircular tube 521 are arranged opposite to the center point of the smoke branch pipe 4 .

[0042] The desulfurization water bed with a forced oxidation nozzle structure also includes a carbide slag pulping pool 9 arranged outside the desulfurization water bed 1. The carbide slag pulping pool 9 is connected to the desulfurization water bed 1 through a carbide slag slurry feeding pipeline 2. A carbide slag slurry circulation pump 10 is installed on the carbide slag slurry feeding pipeline 2.

[0043] The desulfurization water bed with a forced oxidation nozzle structure also includes a carbide slag waste liquid pool 11 arranged outside the desulfurization water bed 1. The bottom end of the desulfurization water bed 1 is connected to the carbide slag waste liquid pool 11 through a carbide slag waste liquid discharge pipe 12, and a carbide slag waste liquid discharge valve 13 is installed on the carbide slag waste liquid discharge pipe 12.

[0044] The technical effects of the utility model are as follows: a mechanical stirrer is installed at the bottom of the desulfurization water bed to fully stir the slurry, thereby improving the desulfurization efficiency of the desulfurizer and reducing the cost of using the desulfurizer. An oxidation fan is arranged outside the desulfurization water bed, and a forced oxidation nozzle and nozzle are arranged inside the water bed to evenly mix the air with the desulfurization slurry in the water bed through the nozzle, and in this process, the reaction between the flue gas and the desulfurization slurry is further enhanced to reduce the generation of calcium sulfite. The specific effects are as follows: 1) Reduce the calcium sulfite generated by the desulfurization slurry due to insufficient oxidation, thereby avoiding equipment blockage or even shutdown, improving the stability of the desulfurization system, and reducing the accident rate. 2) The forced oxidation nozzle and nozzle are suitable for the desulfurization water bed, which is easy to operate, has low investment and operating costs, and has high desulfurization efficiency.

[0045] This implementation case takes the desulfurization water bed of a coal-fired boiler of a heating company as an example. Its desulfurization process uses carbide slag as a desulfurizer. Since carbide slag is essentially a calcium desulfurization method, it is difficult to avoid the problem of insufficient oxidation, which will cause calcium sulfite to block the desulfurization device. At the same time, because the internal space of the desulfurization water bed is too small, no oxidation device is added, but the concentration and pH value of the carbide slag slurry in the water bed are adjusted to prevent the generation of calcium sulfite. However, in the actual operation process, the parameters change too quickly, and there is a phenomenon of untimely control, which leads to equipment blockage. Now the desulfurization water bed is transformed, and a forced oxidation nozzle and nozzle structure are added. The boiler flue gas passes through the flue gas branch pipe below the flue gas pipeline and enters the desulfurization water bed to generate downward bubbles. At this time, the air distributed by the oxidation fan is sent into the desulfurization water bed through the nozzle on the forced oxidation nozzle to generate upward bubbles. After the two bubbles are blended, they are fully oxidized with the carbide slag slurry to avoid the generation of calcium sulfite to block the equipment, improve the stability of the desulfurization system, and reduce the accident rate. This implementation case was actually applied in the company's 5# furnace at different loads of 45t / h, 55t / h, 65t / h and 75t / h. The results showed that by setting the forced oxidation nozzle and nozzle, i.e. the forced oxidation nozzle structure, the formation of calcium sulfite can be effectively suppressed to avoid clogging of the desulfurization equipment and the slurry pipeline. The occurrence of device failures can be greatly reduced during operation. The oxidation efficiency can reach 99% and the desulfurization efficiency can reach 98%. At the same time, the transformation process is simple and the transformation cost is low.

[0046] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A desulfurization water bed with a forced oxidation nozzle structure, characterized in that: include: A desulfurization water bed (1), wherein the desulfurization water bed (1) is connected to a carbide slag slurry feeding pipeline (2); A flue gas duct (3), the flue gas duct (3) being arranged above the desulfurization water bed (1), the flue gas duct (3) being connected to a plurality of flue gas branch pipes (4) along the length direction of the duct, the lower ends of the plurality of flue gas branch pipes (4) all extending into the interior of the desulfurization water bed (1); A forced oxidation nozzle (5), the forced oxidation nozzle (5) is arranged transversely inside the desulfurization water bed (1) and is located below the plurality of flue gas branch pipes (4), the nozzle of the forced oxidation nozzle (5) extends out of the desulfurization water bed (1), a plurality of nozzles (6) are installed on the forced oxidation nozzle (5), and the plurality of nozzles (6) are arranged opposite to the lower end nozzles of the plurality of flue gas branch pipes (4); An oxidation fan (7), the oxidation fan (7) being arranged outside the desulfurization water bed (1), and the air outlet of the oxidation fan (7) being connected to the pipe opening of the forced oxidation nozzle (5); A mechanical stirrer (8), wherein the mechanical stirrer (8) is installed inside the desulfurization water bed (1) and is located below the forced oxidation nozzle (5).

2. A desulfurization water bed with a forced oxidation nozzle structure according to claim 1, characterized in that: The nozzle (6) comprises a first nozzle (61) and a second nozzle (62), and the forced oxidation nozzle (5) comprises: A first nozzle (51), the first nozzle (51) is horizontally placed inside the desulfurization water bed (1) and is located below the flue gas branch pipe (4), a plurality of the first nozzles (61) are installed on the first nozzle (51), the plurality of the first nozzles (61) are arranged opposite to the lower end pipe openings of the plurality of the flue gas branch pipes (4), the first pipe opening of the first nozzle (51) is located inside the desulfurization water bed (1), and the second pipe opening of the first nozzle (51) extends out of the desulfurization water bed (1) and is connected to the air outlet of the oxidation fan (7); A second nozzle (52), the second nozzle (52) is horizontally placed inside the desulfurization water bed (1) and is located below the flue gas branch pipe (4); a plurality of second nozzles (62) are installed on the second nozzle (52); the plurality of second nozzles (62) are arranged opposite to the lower end pipe openings of the plurality of flue gas branch pipes (4), respectively; a first pipe opening of the second nozzle (52) is located inside the desulfurization water bed (1) and is connected and communicated with the first pipe opening of the first nozzle (51); a second pipe opening of the second nozzle (52) extends out of the desulfurization water bed (1) and is connected to the air outlet of the oxidation blower (7).

3. The desulfurization water bed with a forced oxidation nozzle structure according to claim 2, characterized in that: The first nozzle (51) comprises a plurality of first semicircular tubes (511) and a plurality of first connecting straight tubes (512); the plurality of first semicircular tubes (511) are connected and communicated with each other through the first connecting straight tubes (512); the first nozzle (61) is installed on the first semicircular tube (511); and the air outlet of the oxidation fan (7) is connected to the pipe mouth of the first connecting straight tube (512) at the head end; The second nozzle (52) comprises a plurality of second semicircular tubes (521) and a plurality of second connecting straight tubes (522); the plurality of second semicircular tubes (521) are connected and communicated with each other through the second connecting straight tubes (522); the first connecting straight tube (512) located at the end is connected and communicated with the second connecting straight tube (522) located at the end; the second nozzle (62) is installed on the second semicircular tube (521); and the air outlet of the oxidation fan (7) is connected to the pipe mouth of the second connecting straight tube (522) at the head end; The first semicircular tube (511) and the second semicircular tube (521) are arranged spaced apart and facing each other, and the center points of the two are arranged facing the center point of the smoke branch pipe (4).

4. A desulfurization water bed with a forced oxidation nozzle structure according to any one of claims 1 to 3, characterized in that: It also includes a carbide slag pulping pool (9) arranged outside the desulfurization water bed (1), the carbide slag pulping pool (9) is connected to the desulfurization water bed (1) through the carbide slag slurry feeding pipeline (2), and the carbide slag slurry feeding pipeline (2) is installed with a carbide slag slurry circulation pump (10).

5. A desulfurization water bed with a forced oxidation nozzle structure according to any one of claims 1 to 3, characterized in that: It also includes a carbide slag waste liquid pool (11) arranged outside the desulfurization water bed (1), the bottom end of the desulfurization water bed (1) is connected to the carbide slag waste liquid pool (11) through a carbide slag waste liquid discharge pipeline (12), and a carbide slag waste liquid discharge valve (13) is installed on the carbide slag waste liquid discharge pipeline (12).

Images