Flue gas quenching device of flue gas purification system of cremation machine and operation control method of flue gas quenching device

Abstract

The invention provides a flue gas quenching device of a flue gas purification system of a cremation machine and an operation control method of the flue gas quenching device. The flue gas quenching device comprises a reaction tower body and at least one atomizer for spraying atomized liquid drops into the reaction tower body, the flue gas inlet is connected with a flue gas branch pipe, and an outlet of the flue gas branch pipe is connected with a gas inlet of each atomizer; high-temperature flue gas enters the atomizer through the flue gas branch pipe, liquid in the atomizer is atomized into small liquid drops through the high-temperature flue gas and impact force, and the small liquid drops are sprayed out of a nozzle at an outlet of the atomizer. High-temperature flue gas is quenched in the reaction tower body, so that the noise is low, and the occupied area is small; liquid is atomized and scattered into non-continuous atomized liquid drops by the atomizer, the surface area of the liquid in unit volume is increased, the mass and heat transfer process is accelerated, high-temperature flue gas is introduced into the atomizer, the atomization time is shortened, and the volume of the atomized liquid drops is increased, so that the flue gas temperature is rapidly reduced, a dioxin regeneration temperature region is crossed, and pollutant generation is reduced.

Description

Technical Field

[0001] The invention belongs to the field of smoke cooling for cremators, and in particular relates to a smoke quenching device for a smoke purification system for cremators and an operation control method thereof. Background Art

[0002] As my country's funeral reform continues to deepen, the number of cremated bodies continues to increase. During the cremation process, a large amount of high-temperature flue gas will be generated, including pollutants such as particulate matter, dioxins, sulfur oxides and nitrogen oxides. As an important part of flue gas purification, flue gas quenching has the following main purposes: first, to quickly cool the flue gas to avoid the dioxin regeneration temperature range of 200℃-500℃, so as to reduce the dioxin content in the flue gas; second, to cool the high-temperature flue gas to a certain temperature window to meet the temperature resistance requirements of the equipment, pipelines and materials in the flue gas purification system; third, to reduce the temperature of the high-temperature flue gas, so that the flue gas volume is significantly reduced, thereby reducing the specifications of the purification equipment and fans, so as to reduce equipment investment and operating costs.

[0003] In the flue gas purification systems commonly used in the industry, indirect air cooling (such as cooling the flue gas through an air-cooled heat exchanger disclosed in CN201420830084.7) or indirect water cooling (such as cooling the flue gas through a water-cooled heat exchanger disclosed in CN201420830082.8) is generally used to cool the flue gas. Indirect air cooling has a small air convection heat transfer coefficient, requires a large heat exchange area, occupies a large area, and has a limited cooling range in a limited space; some funeral homes use mechanical air coolers (such as those disclosed in CN201310142341.8) to cool the flue gas by mechanical forced air cooling, but it consumes extra power and produces noise pollution; indirect water cooling has the characteristics of large heat transfer area, fast cooling speed, good effect, etc., but the use of circulating water cooling often requires the installation of additional large water storage tanks, which has certain requirements for water quality, equipment materials, equipment welding, etc. Summary of the invention

[0004] The present invention aims to solve the technical problems existing in the prior art. The first object of the present invention is to provide a flue gas quenching device for a cremator flue gas purification system. The second object of the present invention is to provide an operation control method based on the aforementioned flue gas quenching device.

[0005] To achieve the above-mentioned first purpose, the present invention adopts the following technical scheme: a flue gas quenching device of a flue gas purification system of a cremator comprises a reaction tower body having a flue gas inlet and a flue gas outlet, and at least one atomizer for spraying atomized droplets into the reaction tower body, wherein the liquid inlet of the atomizer is connected to a liquid collecting tank containing liquid through a liquid inlet pipe; a flue gas branch pipe is connected to the flue gas inlet, and the outlet of the flue gas branch pipe is connected to the air inlet of each atomizer, and a flue gas filter and a pressure pump for conveying high-temperature flue gas to the atomizer are provided on the flue gas branch pipe; the high-temperature flue gas enters the atomizer through the flue gas branch pipe, and the high-temperature flue gas and impact force cause the liquid in the atomizer to be atomized into small droplets and sprayed out from the nozzle at the outlet of the atomizer.

[0006] The above technical solution uses an atomizer to atomize the liquid and then spray it directly into the reaction tower body, and the heat of the flue gas is transferred to the atomized droplets (such as water mist), and the atomized droplets rely on the evaporation latent heat and sensible heat to absorb the heat of the flue gas, so as to achieve the effect of cooling and quenching the flue gas; and the high-temperature flue gas is quenched in the reaction tower body, with low noise and small footprint. The present invention uses an atomizer to atomize the liquid into discontinuous atomized droplets, increases the surface area of ​​the unit volume of the liquid, accelerates the mass transfer and heat transfer process, and introduces the high-temperature flue gas into the atomizer. The impact force combined with the high temperature causes the liquid to be quickly atomized, shortens the atomization time, and quickly cools the high-temperature flue gas in the reaction tower body. Moreover, under the action of high temperature, the volume of the atomized droplets sprayed from the nozzle becomes larger, which can also improve the cooling effect, so as to rapidly reduce the flue gas temperature, cross the dioxin regeneration temperature zone, and reduce the generation of pollutants.

[0007] In a preferred embodiment of the present invention, the atomizer adopts at least one of an airflow atomizer, a pressure atomizer and a rotary atomizer; when the atomizer adopts an airflow atomizer, the atomizer is connected to a high-pressure air inlet pipe, the outlet of the flue gas branch pipe is connected to the high-pressure air inlet pipe, and the high-pressure and high-temperature gas sprayed from the high-pressure air inlet pipe atomizes the liquid into small droplets and sprays them from the nozzle of the atomizer outlet; when the atomizer adopts a pressure atomizer, the interior of the atomizer is a rotating chamber with blades, and a high-pressure pump is provided on the liquid inlet pipe, and the high-pressure pump pressurizes the liquid The liquid enters the rotating chamber through the flue gas branch pipe, and forms a liquid film in a rotating circular motion. The liquid is atomized and split into small droplets under the high temperature of the high temperature flue gas, and is sprayed out from the nozzle at the outlet of the atomizer. When the atomizer adopts a rotary atomizer, a rotating disk is provided inside the atomizer, and the rotating disk is connected to a rotating driving member for driving the rotating disk to rotate. The liquid entering the atomizer is atomized into small droplets under the centrifugal force of the high-speed rotating disk and the high temperature of the high temperature flue gas, and is sprayed out from the nozzle at the outlet of the atomizer.

[0008] The above technical solution improves the atomization effect and accelerates the mass and heat transfer process by selecting a suitable atomizer.

[0009] In a preferred embodiment of the present invention, the atomizer includes a top atomizer spraying downwardly arranged at the top of the reaction tower body and a plurality of side wall atomizers arranged on the side wall of the reaction tower body and spaced apart along the height direction. The top atomizer adopts an airflow atomizer, and the side wall atomizer adopts a pressure atomizer. The plurality of pressure atomizers arranged along the height direction form a multi-stage pressure atomizer. The flue gas inlet is located at the upper part of the reaction tower body, and the flue gas outlet is located at the lower part of the reaction tower body. The high-temperature flue gas flows from top to bottom in the reaction tower body.

[0010] In the above technical solution, the high-temperature flue gas flows from top to bottom in the reaction tower body, and the top atomizer sprays atomized droplets downward to initially cool the flue gas entering the reaction tower body. As the flue gas flows downward, the atomized droplets sprayed by multiple pressure atomizers are cooled multiple times to quickly cool the high-temperature flue gas in the reaction tower body, thereby achieving the purpose of rapid cooling.

[0011] In a preferred embodiment of the present invention, an inlet temperature sensor for monitoring the inlet flue gas temperature and an inlet concentration sensor for monitoring the inlet flue gas concentration are provided at the flue gas inlet of the reaction tower body, and the signal output ends of the inlet temperature sensor and the inlet concentration sensor are connected to a controller; the controller controls the valve opening of the high-pressure air inlet pipe connected to the flue gas branch pipe outlet according to the inlet flue gas concentration, and the controller controls the injection velocity and diameter of the droplets sprayed from the nozzle according to the inlet flue gas temperature.

[0012] The above technical solution monitors the temperature and concentration of the inlet flue gas to adjust the impact force of the high-pressure gas, the injection speed of the droplets and the diameter of the droplets according to different conditions of the inlet flue gas, thereby ensuring the cooling effect of the high-temperature flue gas.

[0013] To achieve the above second object, the present invention adopts the following technical solution: an operation control method of a flue gas quenching device of a flue gas purification system of a cremator, comprising the following steps: S1, determining the valve opening of a high-pressure air inlet pipe connected to the flue gas branch pipe outlet according to an inlet concentration sensor;

[0014] S2. Determine the diameter and injection speed of the droplets sprayed by the top atomizer according to the data detected by the inlet temperature sensor; S3. Determine the injection speed of the multi-stage pressure atomizer according to the temperature drop between the temperature of the top atomizer and the outlet flue gas temperature of the flue gas outlet.

[0015] The above technical scheme adjusts the impact force of the high-pressure gas of the top atomizer, the injection speed of the droplets and the diameter of the droplets according to the different conditions of the inlet flue gas, so as to ensure the initial cooling effect of the high-temperature flue gas. After the flue gas is initially cooled by the top atomizer, the injection speed of the pressure atomizer is adjusted to ensure the final temperature of the outlet flue gas of the reaction tower body (for example, reduced to 200°C or below).

[0016] In another preferred embodiment of the present invention, in step S2, the specific method for determining the diameter and injection velocity of the droplets sprayed by the top atomizer is:

[0017]

[0018] Where d is the diameter of the droplet, k is the empirical coefficient (between 0.1 and 0.2), μ is the viscosity of the liquid, and ρ l is the density of the liquid, υ is the injection velocity;

[0019] Among them, ρ s is the density of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer, ΔP is the pressure difference between the mixed pressure of high-temperature flue gas and compressed air entering the top atomizer and the nozzle injection pressure;

[0020] Among them, P is the pressure of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer, T is the temperature of the inlet flue gas, and R is the gas constant.

[0021] The above technical scheme determines the density of the mixed gas according to the temperature of the inlet flue gas and the pressure of the mixed gas of the high-temperature flue gas and compressed air entering the top atomizer, determines the injection speed of the nozzle according to the density of the mixed gas and the pressure difference between the inlet and outlet of the atomizer, and then determines the diameter of the droplets by the injection speed. Therefore, by adjusting the injection speed of the nozzle, the diameter of the droplets can be adjusted. The smaller the droplet size, the larger the total surface area of ​​the droplets, the better the mass transfer and heat transfer effects, and the better the cooling effect.

[0022] In another preferred embodiment of the present invention, in step S3, the specific method for determining the injection speed of the pressure atomizer is:

[0023]

[0024] in, is the injection velocity of the nth-stage pressure atomizer, n is the number of stages, A is the cross-sectional area of ​​the injection, L l is the latent heat of evaporation of the liquid, ΔT is the temperature drop between the top atomizer temperature and the outlet flue gas temperature, m s is the total mass of droplets sprayed by the top atomizer, C s is the specific heat capacity of the droplets sprayed from the top atomizer;

[0025] Among them, m 烟 is the mass of input flue gas, C 烟 is the specific heat capacity of flue gas, m 水 is the mass of liquid input to the top atomizer, C 水 is the specific heat capacity of the liquid.

[0026] The above technical scheme, when determining the injection speed of the pressure atomizer, takes into account the density of the liquid, the cross-sectional area of ​​the injection, the latent heat of evaporation of the liquid, the temperature drop between the temperature of the top atomizer and the outlet flue gas temperature of the flue gas outlet, and the total mass of the droplets sprayed by the top atomizer and the specific heat capacity of the droplets. Therefore, according to the set outlet flue gas temperature and the cooling effect of the top atomizer, the injection speed of the pressure atomizer is adjusted to ensure that the actual temperature of the outlet flue gas reaches or is lower than the set outlet flue gas temperature.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 It is a structural schematic diagram of the flue gas quenching device of the cremator flue gas purification system of the first embodiment.

[0030] Figure 2 It is a schematic diagram of the structure of the airflow atomizer in the first embodiment.

[0031] Figure 3 It is a schematic cross-sectional structural diagram of the pressure atomizer in the first embodiment.

[0032] The figure marks in the drawings of the specification include: reaction tower body 10, flue gas inlet 11, flue gas outlet 12, atomizer 20, nozzle 20a, air flow atomizer 21, pressure atomizer 22, rotating chamber 221, blade 222, liquid inlet pipe 30, high-pressure pump 31, liquid collecting tank 40, flue gas branch pipe 50, flue gas filter 51, booster pump 52, one-way valve 53, high-pressure air inlet pipe 60, air source 61, control valve 62. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it is to be understood that the terms “longitudinal”, “lateral”, “vertical”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0036] Embodiment 1

[0037] This embodiment provides a flue gas quenching device for a cremator flue gas purification system, such as Figure 1 As shown, in a preferred embodiment, the flue gas quenching device includes a reaction tower body 10 having a flue gas inlet 11 and a flue gas outlet 12, and at least one atomizer 20 for spraying atomized droplets into the reaction tower body 10. The outlet of the atomizer 20 is a nozzle 20a. The liquid inlet of the atomizer 20 is connected to a liquid collecting tank 40 filled with liquid (the liquid is called a reactant, such as water) through a liquid inlet pipe 30. The liquid in the liquid collecting tank 40 can be transported to the atomizer 20 by weight or a pump. The atomizer 20 atomizes the reactant into discontinuous droplet particles to increase the surface area of ​​the unit volume of liquid.

[0038] The flue gas inlet 11 is connected to a flue gas branch pipe 50, the outlet of which is connected to the air inlet of each atomizer 20. The flue gas branch pipe 50 is provided with a flue gas filter 51 and a pressure pump 52 for conveying high-temperature flue gas to the atomizer 20. The flue gas filter 51 is used to filter fly ash in the high-temperature flue gas entering the atomizer 20 to prevent it from clogging the nozzle 20a of the atomizer 20. Preferably, a one-way valve 53 is also provided on the flue gas branch pipe 50 to only allow the flue gas to flow from the flue gas inlet 11 to the atomizer 20. Under the action of the pressure pump 52, part of the high-temperature flue gas entering the reaction tower body 10 enters the atomizer 20 through the flue gas branch pipe 50, and the high-temperature flue gas and the impact force atomize the liquid in the atomizer 20 into small droplets, which are sprayed into the reaction tower body 10 from the nozzle 20a at the outlet of the atomizer 20.

[0039] The present invention introduces part of the high-temperature flue gas into the atomizer 20, and the impact force combined with the high temperature causes the liquid to be quickly atomized, shortening the atomization time to quickly cool down the high-temperature flue gas in the reaction tower body 10. Moreover, under the action of high temperature, the volume of the atomized droplets sprayed from the nozzle 20a becomes larger, which can also improve the cooling effect.

[0040] In the present invention, the atomizer 20 is at least one of an airflow atomizer 21, a pressure atomizer 22 and a rotary atomizer.

[0041] like Figure 1 and 2 As shown, when the atomizer 20 adopts an airflow atomizer 21, the atomizer 20 is connected to a high-pressure air intake pipe 60, the inlet of the high-pressure air intake pipe 60 is connected to a gas source 61, the gas source 61 is an air compressor or a gas cylinder, the outlet of the flue gas branch pipe 50 is connected to the high-pressure air intake pipe 60, and a control valve 62 is provided on the high-pressure air intake pipe 60. The high-pressure and high-temperature gas sprayed from the high-pressure air intake pipe 60 enters the atomizer 20, atomizes the liquid in the atomizer 20 into small droplets, and sprays them out from the nozzle 20a at the outlet of the atomizer 20. The high-pressure air inlet pipe 60 contains high-pressure air with a faster air flow rate, and the liquid inlet pipe 30 contains liquid reactant. The reactant with a lower flow rate meets the air with a faster speed, generating strong friction and shear force, and the surface tension of the reactant itself atomizes the reactant into small droplets. When the atomized droplets leave the nozzle 20a, they are in the shape of a conical film filled with air. When the relative speed of the gas phase (air) and the liquid phase (atomized droplets) is large enough, the reactant will form a conical film under the action of the gas phase. The film will continue to expand over time and then split into extremely fine droplets. The remaining periphery of the film will split into larger droplets or small liquid masses.

[0042] like Figure 1 and 3As shown, when the atomizer 20 adopts a pressure-type atomizer 22, the interior of the atomizer 20 is a rotating chamber 221 (similar to a turbine) with blades 222, and a high-pressure pump 31 is provided on the liquid inlet pipe 30. The high-pressure pump 31 pressurizes the liquid and pumps it into the rotating chamber 221. The high-temperature flue gas enters the rotating chamber 221 through the flue gas branch pipe 50. The liquid enters the rotating chamber 221 to form a liquid film in a rotating circular motion, and is atomized and split into small droplets under the high temperature of the high-temperature flue gas, and is sprayed out from the nozzle 20a at the outlet of the atomizer 20. The high-pressure pump 31 is used to make the reactant obtain a higher pressure (2MPa~20MPa) so that it has a higher speed. The reactant forms a rotational circular motion when entering the rotating chamber 221. According to the law of conservation of rotational momentum, the rotation speed is proportional to the rotation curvature of the reactant. The closer to the axis, the greater the speed. Finally, an air vortex with a pressure equal to atmospheric pressure is formed in the center of the nozzle 20a. The reactant forms a thin film around the air vortex in the rotating chamber 221. The static pressure energy of the reactant is converted into the kinetic energy of the forward-moving liquid film, which is ejected from the nozzle 20a at high speed. The liquid film stretches and becomes thinner, and finally atomizes and splits into small droplets.

[0043] When the atomizer 20 adopts a rotary atomizer, a rotating disk is provided inside the atomizer 20, and the rotating disk is connected to a rotating driving member (such as a motor + a reducer) that drives the rotating disk to rotate. The liquid entering the atomizer 20 is atomized into small droplets under the centrifugal force of the high-speed rotating disk and the high temperature of the high-temperature flue gas, and is sprayed out from the nozzle 20a at the outlet of the atomizer 20. The centrifugal force of the high-speed rotating disk causes the reactant to extend on the rotating disk and eventually form a thin film, which becomes thinner over time. After the reactant leaves the rotating disk, the centrifugal force gradually exceeds the tension of the liquid phase itself, and eventually the thin film breaks and atomizes, and is sprayed out from the nozzle 20a at high speed.

[0044] like Figure 1 As shown, in another preferred embodiment, a plurality of atomizers 20 are arranged in the reaction tower body 10, and the plurality of atomizers 20 include a top atomizer disposed at the top of the reaction tower body 10 and spraying downward, and a plurality of side wall atomizers disposed on the side wall of the reaction tower body 10 and spaced apart in the height direction, the top atomizer adopts an air flow atomizer 21, and the side wall atomizer adopts a pressure atomizer 22, and the plurality of pressure atomizers 22 disposed in the height direction form a multi-stage pressure atomizer. The flue gas inlet 11 is located at the upper part of the reaction tower body 10, for example, the flue gas inlet 11 is disposed on the upper side wall of the reaction tower body 10 and is located below the top atomizer, and the flue gas outlet 12 is located at the lower part of the reaction tower body 10, for example, at the bottom of the reaction tower body 10, and the high-temperature flue gas flows from top to bottom in the reaction tower body 10.

[0045] The high-temperature flue gas entering the reaction tower body 10 through the flue gas inlet 11 is first cooled by the atomized droplets sprayed by the airflow atomizer 21 on the top, and the flue gas continues to flow downward and is further cooled by the atomized droplets sprayed by the multi-stage pressure atomizer 22 on the side wall to achieve rapid cooling. The cooled flue gas is discharged from the flue gas outlet 12.

[0046] In another preferred embodiment, an inlet temperature sensor (not shown in the figure) for monitoring the inlet flue gas temperature and an inlet concentration sensor (not shown in the figure) for monitoring the inlet flue gas concentration are provided at the flue gas inlet 11 of the reaction tower body 10, and the signal output ends of the inlet temperature sensor and the inlet concentration sensor are connected to the controller.

[0047] The controller controls the valve opening of the control valve 62 of the high-pressure air intake pipe 60 connected to the outlet of the flue gas branch pipe 50 according to the inlet flue gas concentration. When the inlet flue gas concentration is large, the valve opening of the control valve 62 increases, and the impact force of the high-pressure gas is large, so as to improve the atomization effect of the liquid. The controller controls the injection speed and the diameter of the droplets sprayed from the nozzle 20a according to the inlet flue gas temperature. When the inlet flue gas temperature is large, the injection speed of the nozzle 20a is increased (the injection speed can be achieved by adjusting the injection pressure of the nozzle 20a, which is a prior art and will not be described in detail here) to reduce the diameter (droplet particle size) of the droplets sprayed from the nozzle 20a. The smaller the droplet diameter, the larger the total surface area of ​​the droplets, which increases the surface area per unit volume of liquid, improves the heat exchange effect, and improves the cooling effect on the flue gas.

[0048] Embodiment 2

[0049] This embodiment provides an operation control method of a flue gas quenching device of a cremator flue gas purification system based on the first embodiment, comprising the following steps:

[0050] S1. Determine the valve opening of the high-pressure air intake pipe 60 connected to the outlet of the flue gas branch pipe 50 according to the inlet concentration sensor. When the inlet flue gas concentration is large, the valve opening of the control valve 62 is large.

[0051] S2, determining the diameter and injection speed of the droplets sprayed from the top atomizer according to the data detected by the inlet temperature sensor;

[0052] S3. Determine the injection speed of the multi-stage pressure atomizer according to the temperature drop between the temperature of the top atomizer and the outlet flue gas temperature of the flue gas outlet 12 (which is a preset value and is the temperature that the outlet flue gas needs to reach).

[0053] In the present invention, in step S2, the specific method for determining the diameter and injection speed of the droplets sprayed by the top atomizer is:

[0054]

[0055] Where d is the diameter of the droplet, k is the empirical coefficient (between 0.1 and 0.2), μ is the viscosity of the liquid, and ρ l is the density of the liquid, υ is the injection velocity;

[0056] Among them, ρ s is the density of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer; ΔP is the pressure difference between the mixed pressure of high-temperature flue gas and compressed air entering the top atomizer and the nozzle injection pressure, that is, the inlet and outlet pressure difference of the top atomizer, which can be obtained by setting a pressure difference sensor, which is the existing technology;

[0057] Among them, P is the pressure of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer, T is the temperature of the inlet flue gas, and R is the gas constant.

[0058] In the present invention, in step S3, the specific method for determining the injection speed of the pressure atomizer is:

[0059]

[0060] in, is the injection velocity of the nth-stage pressure atomizer, n is the stage number (sorted from top to bottom), A is the cross-sectional area of ​​the injection, L l is the latent heat of evaporation of the liquid (2260 kJ / kg for water), ΔT is the temperature drop between the top atomizer temperature and the outlet flue gas temperature, m s is the total mass of droplets sprayed by the top atomizer (the total mass is the sum of the mass of the flue gas input to the top atomizer and the mass of the liquid input to the top atomizer), C s is the specific heat capacity of the droplets sprayed from the top atomizer;

[0061] Among them, m 烟 is the mass of the input flue gas (which can be measured or calculated using the volume density formula, if known), C 烟 is the specific heat capacity of flue gas (determined experimentally), m 水 is the mass of liquid (such as water) input to the top atomizer (can be measured or calculated using the volume density formula, known), C 水 is the specific heat capacity of a liquid (such as water).

[0062] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flue gas quenching device for a cremator flue gas purification system, characterized in that: It comprises a reaction tower body having a smoke inlet and a smoke outlet and at least one atomizer for spraying atomized liquid droplets into the reaction tower body, wherein the liquid inlet of the atomizer is connected to a liquid collecting tank containing liquid through a liquid inlet pipe; The smoke inlet is connected to a smoke branch pipe, the outlet of the smoke branch pipe is connected to the air inlet of each atomizer, and the smoke branch pipe is provided with a smoke filter and a pressure pump for conveying high-temperature smoke to the atomizer; The high-temperature flue gas enters the atomizer through the flue gas branch pipe, and the high-temperature flue gas and impact force atomize the liquid in the atomizer into small droplets, which are sprayed out from the nozzle at the outlet of the atomizer.

2. The flue gas quenching device of the cremator flue gas purification system according to claim 1, characterized in that: The atomizer is at least one of an air flow atomizer, a pressure atomizer and a rotary atomizer; When the atomizer adopts an airflow atomizer, the atomizer is connected to a high-pressure air inlet pipe, and the outlet of the smoke branch pipe is connected to the high-pressure air inlet pipe. The high-pressure and high-temperature gas sprayed from the high-pressure air inlet pipe atomizes the liquid into small droplets and sprays them out from the nozzle at the outlet of the atomizer; When the atomizer adopts a pressure-type atomizer, the interior of the atomizer is a rotating chamber with blades, and a high-pressure pump is provided on the liquid inlet pipe. The high-pressure pump pressurizes the liquid and pumps it into the rotating chamber. The high-temperature flue gas enters the rotating chamber through the flue gas branch pipe. The liquid enters the rotating chamber to form a liquid film in a rotating circular motion, and is atomized and split into small droplets under the high temperature of the high-temperature flue gas, and is sprayed out from the nozzle at the outlet of the atomizer; When the atomizer adopts a rotary atomizer, a rotating disk is provided inside the atomizer, and the rotating disk is connected to a rotating driving member for driving it to rotate. The liquid entering the atomizer is atomized into small droplets under the centrifugal force of the high-speed rotating disk and the high temperature of the high-temperature flue gas, and is sprayed out from the nozzle at the outlet of the atomizer.

3. The flue gas quenching device of the cremator flue gas purification system according to claim 2, characterized in that: The atomizer includes a top atomizer spraying downwardly arranged at the top of the reaction tower body and a plurality of side wall atomizers arranged on the side wall of the reaction tower body and spaced apart along the height direction. The top atomizer adopts an airflow atomizer, and the side wall atomizer adopts a pressure atomizer. The plurality of pressure atomizers arranged along the height direction form a multi-stage pressure atomizer. The flue gas inlet is located at the upper part of the reaction tower body, and the flue gas outlet is located at the lower part of the reaction tower body. The high-temperature flue gas flows from top to bottom in the reaction tower body.

4. The flue gas quenching device of the cremator flue gas purification system according to claim 3, characterized in that: An inlet temperature sensor for monitoring the inlet flue gas temperature and an inlet concentration sensor for monitoring the inlet flue gas concentration are provided at the flue gas inlet of the reaction tower body, and the signal output ends of the inlet temperature sensor and the inlet concentration sensor are connected to the controller; The controller controls the valve opening of the high-pressure air intake pipe connected to the outlet of the flue gas branch pipe according to the inlet flue gas concentration, and controls the injection speed and diameter of the droplets sprayed from the nozzle according to the inlet flue gas temperature.

5. The operation control method of the flue gas quenching device of the cremator flue gas purification system according to claim 4 is characterized in that: The steps include: S1. Determine the valve opening of the high-pressure air intake pipe connected to the flue gas branch pipe outlet according to the inlet concentration sensor; S2, determining the diameter and injection speed of the droplets sprayed from the top atomizer according to the data detected by the inlet temperature sensor; S3. Determine the injection speed of the multi-stage pressure atomizer according to the temperature drop between the temperature of the top atomizer and the outlet flue gas temperature of the flue gas outlet.

6. The operation control method according to claim 5, characterized in that: In step S2, the specific method for determining the diameter and injection speed of the droplets sprayed by the top atomizer is: Where d is the diameter of the droplet, k is the empirical coefficient (between 0.1 and 0.2), μ is the viscosity of the liquid, and ρ l is the density of the liquid, υ is the injection velocity; Among them, ρ s is the density of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer, ΔP is the pressure difference between the pressure of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer and the nozzle injection pressure; Among them, P is the pressure of the mixed gas of high-temperature flue gas and compressed air entering the top atomizer, T is the temperature of the inlet flue gas, and R is the gas constant.

7. The operation control method according to claim 5, characterized in that: In step S3, the specific method for determining the injection speed of the pressure atomizer is: Among them, θ n is the injection velocity of the nth-stage pressure atomizer, n is the number of stages, A is the cross-sectional area of ​​the injection, L l is the latent heat of evaporation of the liquid, ΔT is the temperature drop between the top atomizer temperature and the outlet flue gas temperature, m s is the total mass of droplets sprayed by the top atomizer, C s is the specific heat capacity of the droplets sprayed from the top atomizer; Among them, m 烟 is the mass of input flue gas, C 烟 is the specific heat capacity of flue gas, m 水 is the mass of liquid input to the top atomizer, C 水 is the specific heat capacity of the liquid.

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