WO2018077127A1

WO2018077127A1 - Gas-gas mixed aspirator

Info

Publication number: WO2018077127A1
Application number: PCT/CN2017/107227
Authority: WO
Inventors: 斯科特·韦恩小福特; 郎建峰
Original assignee: 山西北极熊环境科技有限公司
Priority date: 2016-10-28
Filing date: 2017-10-23
Publication date: 2018-05-03
Also published as: CN106377985A

Abstract

Provided is a gas-gas mixed aspirator, comprising a flow nozzle pipe used for passage of a waste gas flow (0224), a gas-carrying tube and pitot tube (0211, 0212) used for transporting a reagent gas into the waste gas flow (0224), and a hole structure mounted on a flow nozzle pipe and used for enabling passage of the gas-carrying tube; by means of the hole structure, the gas-carrying tube extends from the exterior of the flow nozzle pipe to the interior of the flow nozzle pipe; the pitot tube (0211, 0212) is arranged in the axial direction and is connected to the end of the gas-carrying tube, extends in the direction of the flow of the waste gas (0224), and is used for transporting sucked gas into the waste gas flow (0224).

Description

Air-gas mixing aspirator

Technical field

[0001] The present invention relates to the field of industrial waste gas treatment, and relates to a gas mixing aspirator, and more particularly to a device for mixing a gas such as ozone or chlorine with a gas in a boiler exhaust gas stream.

Background technique

[0002] Boiler exhaust streams from large industrial and power plants usually contain pollutants such as NO and/or SO ₂ . In order to reduce the content of pollutants such as NO and/or SO _{2 in the} exhaust gas, they can be mixed by gas and gas. The aspirator introduces a feed gas that can react with the boiler exhaust stream. Figure 1 is a schematic view showing the structure of a classic gas-gas mixing aspirator in the prior art. Four incisions are selected as the intake ports at different positions of the flue (0100), and the raw material gas (0104) passes through the four intakes. The tube structure at the mouth enters and is mixed with the boiler exhaust stream (0101). The raw material gas (0104) such as 0 _{3 is} mixed with the exhaust gas stream (0101) to make 0 ₃

Mixing with the target contaminant NO in the exhaust stream to convert NO in the exhaust stream to NO ₂ . However, on the one hand, the pressure difference caused by friction usually causes cavitation and delamination in the flue, so that the application cannot convert NO100% into N0 _2; on the other hand, in the classic gas-mixing aspirator In the application, additional gas is required, NO: 0 ₃ is 1: 11⁄2 (molar ratio) to convert all NO to NO _2; in addition, another problem that needs attention is to convert NO to NO ₂ Excessive 0 ₃ may cause ozone escaping and discharge into the atmosphere, while there are strict regulations for 0 ₃ (ozone), and any ozone escaping may violate the relevant regulations.

[0003] In addition, in the application of the classic gas-mixed suction device, the raw material gas pipe at a constant pressure (0107) can be prevented from being blown back (0105) (the exhaust gas enters the raw material gas pipe (0104) and flows into the ozone device. ) influences.

technical problem

In order to overcome the deficiencies in the prior art, the present invention discloses a gas-gas mixing aspirator which is designed in the form of a flow nozzle conduit due to the converging section/tube and diverging section of the gas-gas mixing aspirator/ The designed structure of the tube can eliminate cavitation and delamination; the elimination of cavitation and stratification, so that the 0 ₃ introduced into the exhaust gas stream can fully contact the NO in the exhaust gas stream, and then all the NO in the exhaust gas stream Converted to NO _{2 ;} no need to gas Additional gas is introduced into the gas mixing aspirator, and all NO can be converted to NO ₂ by using NO: 0 ₃ in a molar ratio _{; in} addition, in the gas-gas mixer of the present invention, the direction of the pitot tube is The flow of the exhaust stream is consistent, and the flow rate of the exhaust stream provides a constant suction to the pitot tube feed line to introduce the feed gas into the exhaust stream without the need to maintain the feed gas line at a constant pressure like a classical gas-mixed aspirator .

Problem solution

Technical solution

[0005] The present invention is achieved by the following technical solutions:

[0006] An air-gas mixing aspirator comprising: a flow nozzle pipe for exhaust gas flow, a carrier gas pipe and a seamless pipe for conveying a reaction gas to the exhaust gas flow, and being installed on the flow nozzle pipe The hole structure for passing the carrier gas pipe; the carrier gas pipe extends from the outside of the flow nozzle pipe to the inside of the flow nozzle pipe through the hole structure; the seamless pipe is axially mounted, connected to the end of the carrier gas pipe, and flows to the exhaust gas stream A direction extension for delivering the pumped gas into the exhaust stream.

[0007] As a preferred embodiment, the flow nozzle pipe is composed of an intake pipe, a shrink pipe, a gas flow intermediate pipe, a diverging pipe and an air outlet pipe, wherein a radius of the gas flow intermediate pipe is smaller than that of the intake pipe and the gas outlet pipe The radius, the radius of the intake pipe and the outlet pipe are equal, the seamless pipe is located on the intake pipe, and the air outlet of the seamless pipe extends toward the downstream of the intake pipe.

[0008] As a preferred embodiment, the gas-gas mixing aspirator may include: a flow nozzle pipe for passing the exhaust gas flow, a carrier gas pipe and a seamless pipe for conveying the reaction gas into the exhaust gas flow, and uniform An eyelet structure distributed on the same section of the flow nozzle pipe for passing the carrier gas pipe; the carrier gas pipe extends from the outside of the flow nozzle pipe to the inside of the flow nozzle pipe through an equidistantly distributed orifice structure; The seamless pipe inside the nozzle pipe is axially mounted, connected to the end of the carrier pipe, and extends in the flow direction of the exhaust gas flow.

[0009] As a preferred embodiment, a bent portion is provided at the end of the seamless pipe, a partition is provided near the inlet end of the seamless pipe, and a seamless pipe is disposed between the partition and the bent portion. There are washers for preventing the seamless tube from sliding inside the air-mixing aspirator.

[0010] As a preferred embodiment, the angle between the side wall of the shrink tube and the horizontal direction is 20-70°.

[0011] As a preferred embodiment, the angle between the curved portion of the seamless tube and the horizontal direction is 45°. [0012] As a preferred embodiment, the seamless tube is a pitot tube.

[0013] As a preferred embodiment, the NO-containing exhaust gas stream delivered to the gas-gas mixing aspirator is contacted with the 0 ₃ transported by the carrier gas pipe to convert NO into NO ₂ to form NO ₂ and unconverted NO. Exhaust gas flow. Of course, it is also possible to contact the exhaust stream containing SO ₂ in the gas-gas mixing aspirator with Cl ₂ to convert SO 2 into SCI ₂ .

[0014] As a preferred embodiment, the carrier gas tube is in communication with the ozone generator, and the ozone generator converts 0 ₂ to 0.

3. In one aspect, the present invention discloses an apparatus and method for mixing large amounts of ozone, chlorine, and/or other gases with large industrial and power plant boiler exhaust streams. The apparatus and method include a flow nozzle pipe, a pitot tube disposed at different positions and depths inside the flow nozzle pipe, for guiding a gas (eg, ozone) into the boiler exhaust gas flow and a target such as NO (nitrogen oxide) The exhaust gas stream of the contaminants is contacted and mixed, and NO is brought into contact with ozone 0 _{3 to} react, thereby converting NO into NO ₂ . The flow of gas or liquid through the flow nozzle conduit is described as a motion that flows through the narrow jaw without causing an increase or decrease in entropy. Whenever gas is forced into a pipe or flue, the gas molecules will deflect in the direction of motion due to the presence of the pipe wall. If the velocity of the gas is much less than the speed of sound, the density of the gas will remain the same and the velocity of the fluid will increase. However, when the fluid velocity is close to the speed of sound, the effect of gas compressibility should be considered, and the density of the gas will be related to its location. At the same time, in consideration of the state in which the fluid flows through the pipe or the flue enthalpy, when the flow rate of the fluid slowly decreases and slowly increases, the fluid can return to the previous normal flow state 吋, which is a reversible process.

[0015] In another aspect, in one or more embodiments of the present invention, a flow meter is further included, and the gas can be gased by a gas-gas mixing aspirator under a micro-positive pressure condition of (0.03 ps inverted 0.5 psi). ₃ ) Guide into the exhaust gas flow to ensure that the gas (0 ₃ ) uniformly enters the exhaust gas flow and complete the mixing of the two gases. The gas-gas mixing aspirator is installed in the boiler exhaust gas flow after the electrostatic precipitator or the bag filter (bag filter), and the temperature of the boiler exhaust gas is 150 ° C - 270 ° C. Mixing a gas such as ozone (0 ₃ ) that participates in the reaction requires a certain stagnation time (about 3 seconds). Therefore, the installation of the gas-gas mixing aspirator should consider the factor of stagnation. In the aspirator, the gas flows through a pipe whose cross-sectional area is reduced and then enlarged, thereby generating a change in the volume of the flow. As the pipe narrows, the pressure of the gas inside the pipe will decrease. The flow rate of the fluid in this narrow flow area must be increased to maintain its continuity. Due to the Venturi effect, the interior of the pitot tube is drawn to a vacuum.

Advantageous effects of the invention Brief description of the drawing

DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the drawings to be used in the embodiments or the prior art description will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and other drawings may be obtained from those skilled in the art without departing from the drawings.

[0017] FIG. 1 shows a schematic view of a device of a prior art classical gas-mixed aspirator.

2 is a schematic view showing the apparatus of the gas-gas mixing aspirator of the present invention.

3 is a schematic diagram of a one-dimensional forward shock wave.

4 is a schematic diagram of a suction control panel.

[0021] FIG. 5 is a schematic illustration of the application of a suction device to a boiler exhaust stream.

Embodiments of the invention

[0022] In the following detailed description of the embodiments of the invention, reference to the claims However, it will be apparent to those skilled in the art that the present invention may be practiced without these details. In addition, the present invention does not introduce common knowledge in detail to avoid lengthy descriptions due to unnecessary description.

2 shows a side view and a rear view of a typical gas-mixing aspirator in one or more embodiments of the present invention. Moreover, the gas-gas mixing aspirator shown in one or more embodiments of the present invention is fabricated from 304/316L stainless steel (0208), in addition, the suction end of one or more embodiments of the present invention The size to the adjacent constricted section/tube (0209) is reduced or reduced by about 4 feet. In one or more embodiments of the invention, the distance between the constricted section/tube (0209) of the gas-mixed aspirator to the diverging section/tube (0210) is 8 feet. The surface area of the diverging section/tube (0210) increases back to the original size of the initial end of the aspirator. The movement of the fluid of the present invention through a flow nozzle is referred to as "Technology of Thermodynamics" which is a technique for passing a one-dimensional fluid through a flow nozzle in thermodynamics. In addition, the momentum equations of the control volume are derived and applied to solve such same problems. The speed of sound is defined by thermodynamic properties and mentions the importance of Mach numbers for such variable incompressible fluids.

[0024] Also disclosed in one or more embodiments of the invention are 0°, 45°, 90°, 135°, 180 at the aspirator. . The pitot tubes were installed at 225°, 270° and 315°, respectively, with 4 long pitots (0211) extending into the aspirator and 4 short pitots (0212) extending into the aspirator. These 8 pitot tubes are installed at different angles of the aspirator and are staggered in length.

[0025] The disclosed pitot tube in one or more embodiments of the invention is used to measure the local flow rate at a given point in the flowing fluid, rather than the average flow rate in the conduit or conduit. "Tubes" are generally applied to tubular structures in boilers, heat exchangers, and instrumentation, unlike pipes, pressure pipes, and mechanical pipes (piterons), which are usually classified according to their manufacturing method and processing accuracy (slurry).

In addition, as can be seen from FIG. 2, in one or more embodiments of the present invention, the pitot tube is mounted on the gas-gas mixing aspirator, and the separator fitting is mounted at the end of the pitot tube 1.5 inches from the outer surface of the aspirator ( 0213) The height. The 316 stainless steel washer (0214) is welded to the pitot under the bulkhead to prevent slippage of the pits/holes prepared for the pitot tube on the suction. The distance from the beginning of the baffle to the 45° bend is 3 inches (0215), while the distance from the pitot 45° bend (0216) to the end is 2 inches (0217). The pipe arrangement is a short pitot tube (0212) mounted to the aspirator, which is distributed in sequence and inserted into the aspirator at intervals. When a pitot tube with fittings is installed on the aspirator, the pitot tube is mounted in a 45° bend inside the suction tube toward the exhaust gas flow so that the ozone can flow along with the exhaust gas flow.

[0027] Furthermore, it can be seen from FIG. 2 that in one or more embodiments of the present invention, the long pitot tube and the short pitot tube are installed in a similar manner, and the baffle fitting is mounted at the end of the pitot tube 1.5 inches from the outer surface of the aspirator. The height of (0218). The 316 stainless steel washer (0219) is welded to the pitot under the bulkhead to prevent the pitot tube from slipping on the suction tube/hole for the pitot tube. The distance from the beginning of the bulkhead to the 45° bend is 1 foot to 4 inches (0220), while the distance from the pitot 45° bend (0221) to the end is 2 inches (0223). The pipe is arranged as a long pitot tube (0211) mounted on the aspirator, and the pitot tubes are distributed in order, with the suction device inserted at intervals. When a pitot tube with fittings is installed on the aspirator, the pitot tube is installed in a 45° bend in the direction of the exhaust gas flow inside the aspirator so that the ozone can flow along with the exhaust gas stream.

Further, as shown in FIG. 2, in one or more embodiments of the present invention, the exhaust gas stream (0224) and the secondary gas sucked into the exhaust gas stream flow through the gas-gas mixture suction device. Many of the arguments and equations for fluid problems can be simplified by incorporating the concept of isentropic stagnation states and the properties associated with them. The isentropic stagnation state is the state that a substance will decelerate to zero during the reversible adiabatic process.

[0029] A nozzle is a device that allows the kinetic energy of a substance to increase in an adiabatic state. The increase in kinetic energy is passed The reduction in pressure and the appropriate change in the flow area are achieved. A diffuser is a device that has the opposite function, that is, increases the pressure by reducing the velocity of the substance. In order to maximize the terminology of the term, the nozzle and the diffuser are referred to as nozzles in the future.

[0030] In one or more embodiments of the invention, a shock wave is a wave in which a state undergoes an extremely rapid and abrupt change. In a positive shock wave, this change often occurs at a cross section perpendicular to the flow direction. Figure 3 shows the normal control surface (0325) containing the positive shock (0326). We can now determine the relationship governing fluid flow. Assuming that this is a steady-state, steady-state process, the following relationship can be written, where the subscripts X(0327) and Y(0328) represent the upstream (0329) and downstream shockwaves, respectively.

[0031] The first law:

[0032] continuity equation:

[0033] Momentum equation:

[0034] It is worth noting that the relationship is established on the control surface (0330) without heat transfer and work.

[0035] In summary, it should be noted that the forward shocks considered above were all carried out with the influence of viscosity and thermal conductivity being neglected. The actual positive shock has a certain thickness. However, a good property description of the positive shock is given here to give a fairly accurate quantitative result.

[0036] The steam we are considering now is a substance that exists in the gas phase but has some degree of superheat.

Therefore, steam is likely to have a large deviation from the ideal gas, and the nature of steam condensing must be considered. Such as: Passing hot flue gas from the boiler flue nozzle.

[0037] In the following detailed description of the embodiments of the invention, in the claims However, it will be apparent to those skilled in the art that the present invention may be practiced without these details. In addition, the present invention does not provide a detailed introduction to common knowledge. To avoid complications due to unnecessary description.

[0038] In general, an apparatus and method for mixing one gas with another is disclosed by way of embodiments of the present invention. More specifically, it is disclosed by one or more embodiments of the present invention that a gas such as _{03 is} mixed with a boiler exhaust stream to achieve the purpose of contacting ₀₃ with NO in the boiler exhaust stream. The present invention also discloses the conversion of NO in the exhaust stream to NO ₂ and the introduction of H ₂ 0 to condense the product to form nitric acid.

[0039] According to one or more embodiments of the present invention, it can be seen that the gas and gas mixing device (sucker) includes a flow nozzle pipe, which can be made of, but not limited to, a metal such as stainless steel, a divergent type and a contracted type. device. In order to mix the gases thoroughly, the pitot tubes are distributed in eight different directions of the flow nozzle tubes. Moreover, in one or more embodiments of the invention, the flow meter directs the gas (0 ₃ ) into the aspirator and is evenly distributed into the boiler exhaust stream. Although the number of flow meters and the gas-gas mixing aspirator combined in a particular order are indicated in the embodiments of the present invention, the order or number of flow meters is not limited to these layout arrangements as disclosed in the present invention. Those skilled in the art will appreciate that any change in the number and sequence of flow meters is permissible without departing from the scope of the present disclosure. For example: The use of any number of pitot tubes, flow meters, control valves in the apparatus does not depart from the scope of the present disclosure. Thus, the flexible, modular device disclosed in one or more embodiments of the present invention is applicable to gas mixing applications from different types of industrial exhaust streams.

[0040] The gas-gas mixing aspirator in one or more embodiments of the present invention is capable of converting pollutants (such as nitrogen oxides) produced in industrial plant exhaust gas, where the industrial plant involves multiple market segments. Processing and manufacturing, including but not limited to food processing and packaging, pulp and paper, printing, chemicals and related products, rubber, plastics, hospitals, universities, metal industry, pharmaceutical production, wastewater and sewage treatment, beverages, utilities, incineration , steel, cosmetics, textiles, electronics and petroleum refining.

[0041] In order to remove unwanted and/or target contaminants such as NO and SO ₂ , some reaction is required to achieve this. Some reactions and methods for removing these contaminants from the exhaust gases are described below.

[0042] NO+0 3

[0043] NO _x is nitric oxide (NO) and nitrogen dioxide (NO ₂₎ in general. Both NO and NO ₂ are formed by the reaction of nitrogen and oxygen in the air during combustion. NO ₂ can form wastewater by contacting NO ₂ with steam in water, steam or flue gas stream, and then collect the wastewater and flow it to the wastewater treatment plant for neutralization. . Since NO cannot be removed by contact with water, it is necessary to convert NO into a NO ₂ by a chemical reaction which can be reacted by introducing ozone (0 ₃ ) into the exhaust gas as follows:

NO + 0 3→ NO 2 + 0 2

[0046] Sulfur dioxide (SO ₂ ) and chlorine (CI ₂ ) are two gases widely used in various industries. The main product produced by the reaction of these two gases is sulfonyl chloride, which is a toxic fuming liquid. Therefore, these two gases are rarely added together as a reactant. However, under appropriate conditions, the mixing of the two gases can also produce sulfuric acid. In one or more embodiments of the present invention, FIG. 4 shows a control panel of a gas-mixing aspirator, wherein the control panel (0431) is made of stainless steel or painted steel to prevent dust, light, and Indirect splashing, making it weatherproof, dustproof, and explosion proof. Moreover, in one or more embodiments of the present invention, eight manual flow meters (0432) are provided in the gas-gas mixing aspirator, and each flow meter is manually adjusted to each of the lines (0436) A micro-positive pressure gas (0 ₃ ) is supplied and the gas is introduced into the aspirator to allow the gas to be thoroughly mixed. Further, in one or more embodiments of the present invention, a manual shut-off valve (0433) is mounted on the bottom or bottom of the flow meter for facilitating replacement of the damaged flow meter. A control valve (0435) in the control panel is mounted below the flow meter for supplying the main gas to the flow meter. The control valve (0435) is a normally closed valve that only slams when a gas supply is required. The control valve (0435) is not a regulating valve and can only be used for the opening or closing of the device, while the flow meter controls the flow of gas into the aspirator. The present invention also features a pressure relief valve (0434) for removing residual gases from the line as the primary gas enters the control panel.

In one or more embodiments of the invention, FIG. 5 is a gas-gas mixing aspirator suitable for use in a boiler exhaust stream, and a typical coal-fired boiler that produces an exhaust gas stream is shown. Moreover, in accordance with one or more embodiments of the present invention, the combustor within the boiler (0538) receives a quantity of preheated combustion air and fuel to effect a combustion process to produce an exhaust stream. From the beginning of the boiler (0538), the exhaust stream is directed from the boiler through a metal flue (0539), which in turn flows through the air heater (0540) and the electrostatic precipitator ESP (0541). Further, in one or more embodiments of the present invention, after the electrostatic precipitator ESP (0541) removes all of the large particles of fly ash and particulate matter in the exhaust stream, the exhaust stream is sent to the gas-gas mixing aspirator (0542) .

[0048] In one or more embodiments of the invention, the gas-gas mixing device (0542) mixes the ozone (0 ₃ ) with the exhaust gas stream to convert NO to NO ₂ .

[0049] The oxidation reaction in the redox reaction (Reference: Basic Chemistry, Chemical Concept Method, Fourth Edition) The initial refers to the reaction of the substance with the oxidation, and the "reduction reaction" refers to the reaction of removing the oxygen in the oxygenate. As the understanding continues to deepen, the meaning of "oxidation reaction" and "reduction reaction" is gradually expanding. The oxidation reaction is a process in which the atomic oxidation value is increased, and the reduction reaction refers to a process in which the atomic oxidation value is lowered. It can be clearly seen from the principle of distribution of oxidation values that neither the oxidation reaction nor the reduction reaction occurs separately.

[0050] Furthermore, the total increase in the oxidation value is always equal to the total reduction in the oxidation value. Since one substance cannot be reduced, unless the other substance is oxidized, the reduced substance undergoes an oxidation reaction, which is called an oxidizing agent. Since the two processes of oxidation and reduction are interdependent, the opposite is true, that is, the substance to be oxidized is called a reducing agent.

[0051] The equations for oxidation-reduction reactions are generally more difficult to trim than those that do not involve oxidation-reduction reactions. The oxidation-reduction equation is usually balanced by the oxidation method and the ion/electron method.

[0052] Even at 3000 ° C, the yield of NO is only about 4%. A good NO preparation method, the hot gas generated by the reaction must be rapidly cooled to prevent the decomposition of NO into Ν^Π0 ₂ . Through this reaction, N ₂ in the atmosphere is fixed by the action of lightning, and the reaction can also provide the necessary high temperature environment for the combination of Ν ₂ and 0 ₂ by the arc process, thereby achieving the purpose of nitrogen fixation.

[0053] In one or more embodiments of the invention, the ozone in Figure 5 is provided by an ozone generator (05 43) that produces ozone. The outlet of the oxygen supply unit (0544) is connected to the ozone generator via a series of pipes, fittings and control valves (0545). The control valve (0545) controls the flow of oxygen to the ozone generator (0543) and adjusts the boiler system so that the oxygen supply unit (0544) supplies the ozone generator (0543) with an appropriate amount of oxygen.

[0054] In one or more embodiments of the invention, oxygen (0 ₂ ) enters the ozone generator (0543), and under the action of high-pressure charge bombardment, a portion of 0 _{2 is} converted to 0 ₃ (ozone). Due to the continuous high-pressure charge bombardment in the ozone generator (0543) vessel, a large amount of heat dissipation will be required to cool, so that the temperature of the ozone in the vessel is maintained near ambient temperature. Most ozone generators are internally provided with a cooling system for maintaining the required temperature. The cooling system sends cooling water through the cooling water supply unit (0546), and drains the cooling water to the cooling tower (0547). The cooling water is in the cooling tower. After the internal temperature is lowered, it is returned to the cooling system of the ozone generator (0543) through the return pipe (0548) as cooling cooling water, and the cooled cooling water is used to assist the normal operation of the cooling system cooling work.

[0055] In one or more embodiments of the invention, the generated ozone (0 ₃ ) enters the gas-mixing suction control panel (0549) through a series of pipes and fittings. Before the air-mixing suction control device (0551) is snoring, Ozone (O ₃ ) is removed to remove all gases from the system. Once the gas-mixed aspirator control valve (0551) is snoring, ozone (0 ₃ ) will enter the gas-gas mixing aspirator through a series of flow meters (0552).

[0056] In one or more embodiments of the invention, the flow meter (0552) delivers a micro-positive pressure of 0.03-0.05 psi to each of the lines in a manually adjusted configuration. The ozone output from the flow meter (0552) is sent to the gas-mixing suction bow I (0542) through a series of lines (0553) to treat the ozone (0 3

And mixing with the exhaust stream to convert NO to NO ₂ .

[0057] By definition, the kinetic region is a period in which the concentration of the reaction component is constantly changing, and the equilibrium region is a period in which the concentration of the reaction component does not change further, and the reaction appears to be stopped. .

[0058] The gas is mixed with the boiler exhaust stream and then drained to other equipment (0554) to remove the converted N in the exhaust gas.

0 ₂ . It will be apparent to those skilled in the art that the present invention may be practiced without these details. In other embodiments, some common general knowledge has not been re-introduced to avoid unnecessary complicated descriptions.

The basic principles, main features, and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, and that the present invention is described in the foregoing embodiments and the description of the present invention. Variations and modifications are intended to fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.

Claims

Claim

[Claim 1] An air-gas mixing aspirator characterized by: a flow nozzle pipe for exhaust gas flow

a carrier gas pipe and a seamless pipe for conveying the reaction gas into the exhaust gas stream, and an orifice structure installed on the flow nozzle pipe for passing the carrier gas pipe; the carrier gas pipe extending from the outside of the flow nozzle pipe through the hole structure to The inside of the flow nozzle pipe; the seamless pipe is axially mounted, connected to the end of the carrier gas pipe, and extends in the flow direction of the exhaust gas flow for conveying the sucked gas into the exhaust gas stream.

[Claim 2] The gas-gas mixing aspirator according to claim 1, wherein: the flow nozzle pipe is composed of an intake pipe, a shrink pipe, a gas flow intermediate pipe, a diverging pipe, and an air outlet pipe, wherein The radius of the middle pipe of the air flow is smaller than the radius of the intake pipe and the air outlet pipe, the radius of the intake pipe and the air outlet pipe are equal, the seamless pipe is located on the intake pipe, and the air outlet of the seamless pipe extends to the downstream direction of the intake pipe.

[Claim 3] The gas-gas mixing aspirator according to claim 1, comprising: a flow nozzle pipe for passing the exhaust gas flow, a carrier gas pipe and a seamless pipe for conveying the reaction gas to the exhaust gas flow And an eyelet structure uniformly distributed on the same section of the flow nozzle pipe for passing the carrier gas pipe; the carrier gas pipe extends from the outside of the flow nozzle pipe to the inside of the flow nozzle pipe through an equidistantly distributed orifice structure; The seamless pipe distributed inside the flow nozzle pipe is axially mounted, connected to the end of the carrier gas pipe, and extends in the flow direction of the exhaust gas flow.

[Claim 4] The gas-gas mixing aspirator according to claim 3, wherein: a bent portion is provided at an end of the seamless pipe, and a partition is provided near the inlet end of the seamless pipe, and is separated A gasket for preventing the seamless tube from sliding in the gas-mixing suction device is provided on the seamless tube between the plate and the bent portion.

[Claim 5] The gas-gas mixing aspirator according to claim 3, wherein the angle between the side wall of the shrink tube and the horizontal direction is 20-70.

[Claim 6] The gas-air mixing aspirator according to claim 3, wherein the angle between the curved portion of the seamless tube and the horizontal direction is 45°.

[Claim 7] The gas-gas mixing aspirator according to any one of claims 1 to 6, wherein the seamless tube is a pitot tube.

[Claim 8] The gas-gas mixing aspirator according to any one of claims 1 to 3, wherein: The exhaust gas stream containing NO in the gas-gas mixing aspirator and the O ₃ conveyed by the carrier gas pipe

In contact, NO is converted to NO ₂ to form an exhaust stream comprising NO ₂ and unconverted NO.

[Claim 9] The gas-gas mixing aspirator according to any one of claims 1 to 3, wherein: the exhaust gas stream containing SO ₂ delivered to the gas-gas mixing aspirator is in contact with C1 ₂ to form SO ₂ Converted to SCI

[Claim 10] The gas-gas mixing aspirator according to claim 8, wherein: the carrier gas pipe is in communication with the ozone generator, and the ozone generator converts 0 ₂ into 0 ₃ .