CN219756388U - Cyanide-containing waste gas treatment device - Google Patents

Abstract

The utility model provides a cyanide-containing waste gas treatment device which comprises an incinerator, at least one air ring box and at least two-stage spray guns. The incinerator comprises a plurality of diverging shoulders of air passages; the air ring box is arranged outside the gradually-expanding shoulder in a surrounding manner, and is communicated with the gradually-expanding shoulder through a plurality of air channels; the at least two-stage spray gun comprises at least one stage of waste gas spray gun and at least one stage of fuel spray gun, and the spray gun is inserted into the corresponding air channel through the air ring box; wherein, the axial interval setting of different stage spray guns along the incinerator, every stage spray gun all includes a plurality of spray guns of circumference interval setting along the incinerator, and the spray gun has the projection on the plane of perpendicular to axial, and the projection of different stage spray guns misplaces in circumference. The temperature field in the combustion process of the device is uniform, toxic and harmful substances are thoroughly decomposed, the generation of thermal nitrogen oxides is reduced, the local heat accumulation of the inner lining and the outer shell of the incinerator is reduced, the material cost of the inner lining and the outer shell of the incinerator is reduced, and the smoke achieves the environmental protection emission requirement.

Description

Cyanide-containing waste gas treatment device

Technical Field

The utility model relates to the technical field of waste treatment, and in particular relates to a cyanide-containing waste gas treatment device.

Background

At present, a thermal oxidation incineration method and an incinerator device are generally adopted for treating cyanide-containing waste gas generated in the chemical industry such as acrylonitrile, and a cyanide-containing waste gas spray gun and a fuel spray gun are arranged in a centralized manner, so that the problem that the local temperature in the incinerator hearth is too high or too low can be caused when the high-flow waste gas is incinerated. On one hand, the heat in the combustion area is gathered, the temperature is too high, the generation amount of thermal nitrogen oxides is increased sharply, and the heat resistance of the material of the inner lining and the outer shell of the incinerator is required to be high, so that the material cost of the inner lining and the outer shell of the incinerator is increased. On the other hand, the partial temperature of the large-flow waste gas sprayed into the rear hearth is too low, and toxic and harmful substances in the waste gas are decomposed and oxidized incompletely, so that the final flue gas emission exceeds the standard, and the environmental protection emission requirement cannot be met.

Accordingly, there is a need for a cyanide containing exhaust treatment device that at least partially addresses the problems of the prior art.

Disclosure of Invention

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to solve the above problems at least in part, according to one aspect of the present utility model, there is provided a cyanide-containing exhaust gas treatment device comprising:

the incinerator comprises a divergent shoulder, wherein the divergent shoulder is provided with a plurality of air channels;

at least one air ring box disposed circumferentially outside of the diverging shoulder, the air ring box being in communication with the diverging shoulder via a plurality of the air passages;

at least two-stage spray guns, the spray guns are inserted into the corresponding air channels through the air ring boxes, and the at least two-stage spray guns comprise at least one stage of waste gas spray gun and at least one stage of fuel spray gun;

wherein, different grades the spray gun is followed the axial interval setting of burning furnace, every stage the spray gun all includes along a plurality of spray guns of burning furnace's circumference interval setting, the spray gun has the projection on the perpendicular to the plane of axial, different grades the projection of spray gun is in dislocation in the circumference.

According to the scheme, through the arrangement of the exhaust gas spray gun and the fuel spray gun at circumferential intervals, the arrangement of the exhaust gas spray gun and the fuel spray gun in a staggered manner in an axial grading manner, the temperature field in the combustion process is uniform, toxic and harmful substances are thoroughly decomposed, the generation of thermal nitrogen oxides is reduced, the local heat aggregation of the inner lining and the outer shell of the incinerator is reduced, the material cost of the inner lining and the outer shell of the incinerator is reduced, the service life of the incinerator is prolonged, and the environmental protection emission requirement of the flue gas is guaranteed. Meanwhile, the cyanogen-containing waste gas is injected from the divergent shoulder of the incinerator and has a certain distance from the flame in the flame hearth, so that the influence on the flow field of the flame hearth is weakened. The waste gas spray guns are arranged in a multi-row annular way, and after being sprayed, the cyanide-containing waste gas is mixed with high-temperature flue gas and combustion air, and the cyanide-containing waste gas is subjected to thermal oxidation in the area to thoroughly destroy organic components in the area.

Optionally, each stage of the fuel lance is disposed between two adjacent stages of the exhaust lances; and/or

The one stage exhaust lance is disposed upstream of the corresponding one stage fuel lance.

Optionally, the central axis Axi of the lance and the central axis Ax of the incinerator have an angle α of 10 ° or more and 90 ° or less.

Optionally, the included angle α of the lances of different stages is the same and/or the included angle α of the lances of the same stage is the same.

According to the scheme, the fuel staged combustion technology is adopted, the incineration temperature is reduced, organic matters can be combusted stage by stage, the smoke quantity and the heat load are slowly increased, the high-temperature area is dispersed, the temperature field in the furnace is uniform, and NO is effectively inhibited _x And (5) generating.

Optionally, the central axis Axi of the lance and the circumferential surface of the air ring box have an intersection point Pi, and the incinerator has a radial line Li extending through the intersection point Pi, and an angle β between the radial line Li and the central axis Axi of the lance is-30 ° β.ltoreq.30 °.

Optionally, the included angle β of the lances of different stages is the same or different, and/or the included angle β of the lances of the same stage is the same.

According to the scheme, the exhaust gas or fuel of the same stage forms a flame tangential circle in the cavity of the incinerator, and the flame center is opposite to the flame tangential circle, so that the flame stability is controllable.

Optionally, the number of guns is different for different stages, and/or

The number of the exhaust gas spray guns at the downstream stage is greater than the number of the exhaust gas spray guns at the upstream stage; and/or

The number of the spray guns of each stage is 2-30.

Optionally, the spray gun comprises two or more air ring boxes, each stage of spray gun is correspondingly arranged on one air ring box, and each air ring box is provided with at least two air inlets; or alternatively

The spray gun comprises an air ring box, wherein at least two stages of spray guns are arranged on the air ring box, and the air ring box is provided with at least two air inlets.

According to the scheme, at least two air inlets are formed in the air ring box, combustion air is introduced into the air ring box from the combustion fan through the air inlets and flows into the incinerator cavity from the air channel, air flows uniformly in the incinerator cavity, and is uniformly mixed with waste gas and fuel, so that combustion uniformity is improved.

Optionally, the incinerator further comprises a burner, and the burner is arranged at the front end of the incinerator.

According to the scheme, the burner is arranged at the front end of the flame hearth and used as a core fire source of the flame hearth, so that the ignition and combustion of the cyanide-containing waste gas are ensured. Meanwhile, the burner is also used as a long-term open flame, so that pressure fluctuation in the furnace caused by mutation of cyanide-containing waste gas is prevented, flameout is caused, and combustion safety of an incineration system and operation reliability of the whole device are improved.

Optionally, the air passage is provided with swirl means through which the lance extends.

According to the scheme, the fuel flows through the cyclone device to form cyclone airflow, so that the mixing uniformity of the fuel, waste gas and air is improved, the combustion space is effectively utilized, and the combustion uniformity is improved.

Drawings

The following drawings are included to provide an understanding of the utility model and are incorporated in and constitute a part of this specification. Embodiments of the present utility model and their description are shown in the drawings to illustrate the devices and principles of the utility model. In the drawings of which there are shown,

FIG. 1 is a schematic cross-sectional view of a cyanide-containing exhaust gas treatment device according to a preferred embodiment of the utility model;

FIG. 2 is a schematic cross-sectional view of the combustor shown in FIG. 1;

FIG. 3 is a schematic side view of the combustor shown in FIG. 1 and viewed in an axial direction;

FIG. 4 is a schematic cross-sectional view of a portion of the cyanide containing exhaust treatment device shown in FIG. 1;

FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 1, illustrating the arrangement of the first stage spray guns;

FIG. 6 is a schematic cross-sectional view taken along line B-B of FIG. 1, showing the placement of a second stage lance;

FIG. 7 is a schematic cross-sectional view taken along line C-C of FIG. 1, illustrating the placement of a third stage lance;

FIG. 8 is a partial schematic view of the fuel lance shown in FIG. 1 illustrating the manner in which the fuel lance is installed; and

fig. 9 is a partial schematic view of the exhaust lance shown in fig. 1, wherein the manner of installation of the exhaust lance is shown.

Description of the reference numerals

100: cyanide-containing waste gas treatment device

110: combustion fan

120: incinerator with a heat exchanger

121: gradually expanding shoulder

122: protective cover

123: air passage

124: burner with a burner body

125: air inlet

126: flame hearth

127: oxidation furnace

128: support seat

129: manhole (manhole)

131: igniting gun

132: fire detection

133: castable

134: fire observation hole

135: thermocouple interface

136: pressure transmitter interface

137: fuel inlet

138: liner for a vehicle

139: outer casing

140: exhaust gas spray gun

141: exhaust gas spray gun spray pipe

142: exhaust gas spray gun nozzle

150: fuel spray gun

151: fuel spray gun nozzle

152: fuel spray gun nozzle

153: cyclone device

170: air preheater

180: air ring box

181: air inlet

182: waste gas spray gun interface

183: fuel spray gun interface

Axi: central axis of spray gun

Ax: central axis of incinerator

Li: radial line of incinerator

Pi: intersection point

Alpha: axi and Ax

Beta: included angle between Li and Axi

Gamma: axi and the horizontal section of the incinerator

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model.

In the following description, a detailed description will be given for the purpose of thoroughly understanding the present utility model. It will be apparent that embodiments of the utility model may be practiced without limitation to the specific details that are familiar to those skilled in the art. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".

It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for illustrative purposes only and are not limiting.

Exemplary embodiments according to the present utility model will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.

Fig. 1 to 9 show a cyanide-containing exhaust gas treatment apparatus 100 for decomposing a cyanide-containing exhaust gas into CO by using a thermal oxidation method according to a preferred embodiment of the present utility model ₂ 、H ₂ O and N ₂ And the like, and simultaneously generates a certain amount of fuel type and thermal type NO _x Then the fuel type NO and the thermal type NO are processed by the mature denitration technology _x To a dischargeable solubility. The device operates with micro positive pressure.

The cyanide containing exhaust treatment device 100 includes an incinerator 120, at least one air ring box 180 and at least a secondary lance. The incinerator 120 includes a diverging shoulder 121, the diverging shoulder 121 being provided with a plurality of air passages 123; the air ring box 180 is arranged around the outside of the diverging shoulder 121, and the air ring box 180 is communicated with the diverging shoulder 121 through a plurality of air channels 123; the spray guns are inserted into the corresponding air channels 123 via the air ring boxes 180, and at least two-stage spray guns include at least one-stage exhaust gas spray gun 140 and at least one-stage fuel spray gun 150; wherein, the different stage spray guns are arranged along the axial direction of the incinerator 120 at intervals, each stage spray gun comprises a plurality of spray guns arranged along the circumferential direction of the incinerator 120 at intervals, the spray guns have projections on a plane vertical to the axial direction, and the projections of the spray guns at different stages are staggered along the circumferential direction.

According to the cyanide-containing waste gas treatment device 100 provided by the utility model, the waste gas spray gun 140 and the fuel spray gun 150 are arranged at intervals in the circumferential direction, are axially graded and are arranged in a staggered manner, the temperature field in the combustion process is uniform, toxic and harmful substances are thoroughly decomposed, the generation of thermal nitrogen oxides is reduced, the local heat accumulation of the inner lining and the outer shell 139 of the incinerator 120 is reduced, the material cost of the inner lining and the outer shell 139 of the incinerator 120 is reduced, the service life of the incinerator is prolonged, and the environmental protection emission requirement of smoke is ensured.

Specifically, in this embodiment, the following settings are possible: (1) the waste gas contains HCN, and the treatment capacity is about 100t/h; (2) the natural gas make-up is about 4000Nm ³ /h; (3) the air preheating temperature value is 150 ℃; (4) the incinerator 120 is a horizontal incinerator. It will be appreciated that the incinerator 120 may be a vertical incinerator, and accordingly, the structure, the process parameters, etc. of the incinerator 120 may be adjusted accordingly to meet the working requirements of the vertical incinerator.

As shown in fig. 1 and 4, the incinerator 120 may be structurally divided into two sections of a diverging shoulder 121 and an equal diameter shaft which are sequentially disposed and communicated. The diverging shoulder 121 is provided with a plurality of air passages 123 for communicating the air ring box 180 with the incinerator 120. The flame hearth 126 and the oxidation hearth 127 are sequentially arranged and communicated from the functional point of view, wherein the flame hearth 126 mainly provides a place for the stable combustion of the burner 124, and the oxidation hearth 127 is mainly used for the waste gas incineration. The burning of cyanide-containing waste gas has the following difficulties: firstly, the uniform and rapid mixing of the cyanide-containing waste gas and the high-temperature flue gas flowing out of the flame hearth 126 after the spraying is ensured, so as to achieve the purpose of incineration; secondly, the phenomenon that the pressure in the furnace is suddenly changed and the flow field is disturbed due to the fact that high-flow cyanide-containing waste gas is sprayed into the furnace is prevented, flame is drawn out or sucked in unstably (in a random manner), and as a result, combustion is unsafe or the temperature field is uneven, organic components are not thoroughly decomposed, and the environment-friendly requirement cannot be met. The cyanide-containing waste gas is thus designed to be injected from the diverging shoulder 121 of the incinerator 120 at a distance from the flame in the flame chamber, reducing its impact on the flame chamber flow field. The cyanide-containing waste gas nozzles are uniformly arranged in a multi-stage annular manner at the divergent shoulder 121, the cyanide-containing waste gas is mixed with high-temperature flue gas after being sprayed, and the cyanide-containing waste gas is subjected to thermal oxidation in the area (namely the oxidation furnace 127) to thoroughly destroy organic components in the area.

The different stages of lances are disposed at intervals along the axial direction of the incinerator 120, each stage of lances including a plurality of lances disposed at intervals along the circumferential direction of the incinerator 120. Specifically, the oxidation furnace 127 is provided with fuel lances 150 and exhaust gas lances 140 at intervals along the central axis Ax of the incinerator 120. Preferably, each stage of fuel lance 150 is disposed between adjacent two stages of exhaust lance 140; and/or the primary exhaust lance 140 is disposed upstream of the corresponding primary fuel lance 150. Correspondingly, the air ring box 180 is provided with an exhaust lance 140 interface and a fuel lance 150 interface, the exhaust lance 140 and the fuel lance 150 being plugged to the corresponding air channel 123 via the exhaust lance 140 interface and the fuel lance 150 interface, respectively, for introducing the cyanide-containing exhaust gas and fuel into the incinerator 120, in particular into the oxidation furnace 127 or the diverging shoulder 121. Preferably, fuel lance 150 is provided in stages 1-2 and exhaust lance 140 is provided in stages 1-3. For example, in fig. 1 and 4, the air ring box 180 is provided with a two-stage exhaust gas gun 140 interface and a 1-stage fuel gun 150 interface, which are arranged in the following order along the flow direction of the flue gas: a stage 1 exhaust lance 140 interface, a stage 1 fuel lance 150 interface, and a stage 1 exhaust lance 140 interface. Alternatively, the central axis Axi of the lance and the central axis Ax of the incinerator 120 have an angle α of 10+.α.ltoreq.90 °. Preferably, 45 DEG.ltoreq.alpha.ltoreq.90 deg. Optionally, the angles α of the lances of different stages are the same and/or the angles α of the lances of the same stage are the same. Optionally, the number of different stages of lances is different and/or the number of downstream located primary exhaust lances 140 is greater than the number of upstream located primary exhaust lances 140; and/or the number of lances per stage is 2-30, preferably 4-16. It will be appreciated that fuel lance 150 may not be provided if the exhaust gas heating value is high, in other words, may be provided in stage 0 (not shown).

The exhaust gas lance 140 and the fuel lance 150 have projections on a plane perpendicular to the axial direction of the incinerator 120, and the projections of the lances of different stages are offset in the circumferential direction of the incinerator 120. Preferably, the central axis Axi of the lance and the circumferential surface of the air ring box 180 have an intersection point Pi, and the incinerator 120 has a radial line Li extending through the intersection point Pi, and the radial line Li forms an angle β of-30 β+.ltoreq.30 ° with the central axis Axi of the lance. The range of the included angle beta is set so that the exhaust gas or fuel of the same stage forms a flame tangential circle in the cavity of the incinerator 120, and the flame center is prevented from being opposite, so that the flame stability is controllable. The greater the included angle beta, the greater the tangential flame circle formed, preferably, -15 deg. beta.15 deg.. Optionally, the included angles beta of the spray guns at different stages are the same or different; the included angle beta of the spray gun at the same stage is the same. Preferably, the central axis Axi of the lance is at an angle γ to the horizontal cross-section of the incinerator 120, which angle γ is primarily used to stagger the lances of different orders. In order to distinguish the angles of the different stages of spray guns, the stages of each spray gun are designated by numerals after the three angles (i.e., included angle α, included angle β, and included angle γ). Specifically, α1, α2, α3, β1, β2, β3, γ1, γ2, and γ3 such as those shown in fig. 4 to 7.

Preferably, the first stage exhaust lance 140 has an α1 value of 45 °, a β1 value of 7 °, a γ1 value of 7.5 °, and a lance number of 8; the second stage fuel lance 150 has an α2 value of 45 °, a β2 value of 10 °, a γ2 value of 15 °, and a lance number of 12; the third stage exhaust lance 140 has an α3 value of 45 °, a β3 value of 13 °, a γ3 value of 0 °, and a lance number of 16.

The cyanide-containing exhaust gas treatment device 100 may further include two or more air ring boxes 180 (not shown), each stage of spray gun is correspondingly disposed in one air ring box 180, and each air ring box 180 is provided with at least two air inlets 181; or comprises an air ring box 180 (fig. 1 and 4), at least two stages of spray guns are arranged on one air ring box 180, and the air ring box 180 is provided with at least two air inlets 181. Preferably, the air ring boxes 180 are provided with 1-2. As shown in fig. 1 and 4, an air ring box 180 is provided to the oxidation oven chamber 127 (specifically, the diverging shoulder 121). For example, the oxidation furnace 127 is provided with 1 air ring box 180. Since the amount of air in the burner 124 is large, in order to ensure uniform flow of air into the air ring case 180, the air ring case 180 is provided with a plurality of air inlets 181, preferably, 2 to 14 air inlets 181. For example, the air ring case 180 is provided with 2 air inlets 181 (only one is shown in fig. 1 and 4). It will be appreciated that in order to reduce the amount of fuel used, the combustion air entering the incineration system may be passed through the air preheater 170 and then introduced into the incinerator 120, optionally preheated to 80-250 c and then introduced into the incinerator 120/burner 124/air ring box 180. Preferably, the air is preheated to 150 ℃. Combustion-supporting air enters the cyanide-containing waste gas treatment device 100 in two paths, one path enters the burner 124 from the air inlet 125, the other path is introduced into the air ring box 180 on the oxidation hearth 127 from the air inlet 181, and then enters the oxidation hearth 127 through the air channel 123 which is communicated with the air ring box 180 and the oxidation hearth 127, so as to provide combustion-supporting air for waste gas and fuel, and simultaneously, the effect of controlling the hearth temperature can be achieved.

Referring back to fig. 1, the cyanide waste gas treatment device 100 further includes a burner 124. The burner 124 is disposed at the front end of the incinerator 120, specifically, at the front end of the flame chamber 126, for example, may be the head of the flame chamber 126, so as to serve as a core fire source of the flame chamber 126, and ensure the ignition and combustion of the cyanide-containing waste gas. Meanwhile, the burner 124 also serves as a long-term open flame, provides stable combustion flame for the incinerator 120, prevents the fluctuation of the pressure in the incinerator due to the mutation of cyanide-containing waste gas, and improves the combustion safety of the incineration system and the operation reliability of the whole device. The burner 124 may be purchased directly from a mature burner 124 product with a power selected according to the specific project conditions and a load in the range of 1-10 MW. As shown in fig. 1-3, the burner 124 has: a pilot gun 131 for igniting the fuel when the processing means is started; a fuel inlet 137 for providing stable fuel for combustion by the burner 124, it being understood that fuel (e.g., natural gas) may enter the cyanide-containing exhaust treatment device 100 in two paths, one from the fuel inlet 137 of the burner 124 and the other from the fuel lance 150 of the oxidation furnace 127; a flame viewing hole 134 for viewing the flame condition of the burner 124 from the tail of the burner 124; a fire check 132 for determining whether a flame is present in the burner 124; an air inlet 125 for providing combustion air to the fuel-fired burner 124, optionally using a combustion fan 110 to introduce combustion air into the air inlet 125; the castable 133, the castable 133 is disposed at the outlet of the burner 124, for protecting the interface flange of the burner 124 and the incinerator 120. It will be appreciated that the burner 124 may be augmented with other components in addition to the basic components described above, as the case may be. Preferably, the burner 124 is a finished product device, and according to practical situations, has: the number of the fire observation holes 134 is 2-3, the number of the fire detectors 132 is 2-4, the number of the fuel inlets 137 is 1-3, and the number of the air inlets 181 is 1-3. Preferably, the burner 124 has 1 ignition gun 131; 2 fuel inlets 137 respectively provided at the center and outer circumference of the burner 124; 2 fire observation holes 134 arranged at the tail of the burner 124; 3 fire checks 132, wherein 1 fire check 132 is arranged at the tail part of the ignition gun 131, and 2 fire checks 132 are arranged on the panel of the burner 124; 1 air inlet 125.

As shown in fig. 8-9, the exhaust lance 140 is comprised of an exhaust lance 140 nozzle and an exhaust lance 140 nozzle. The fuel lance 150 is comprised of a fuel lance 150 nozzle, and a swirling device 153. The air channel 123 is provided with swirl means 153 through which the lance extends, in other words the swirl means 153 is arranged at a position upstream of the lance nozzle. It will be appreciated that the swirl device 153 is provided or not is determined based on the oxygen demand of theoretical combustion of the medium (i.e. fuel and exhaust) within the lance. The theoretical oxygen demand of the fuel is large, so that the combustion space is effectively utilized to improve the mixing uniformity of the combustion air and the fuel, and the fuel lance 150 extends through the swirling device 153. The cyanide-containing waste gas has a smaller theoretical oxygen demand, and the waste gas spray gun 140 can be correspondingly provided with a cyclone device 153 in the air channel 123, or the cyclone device 153 can be not provided. Preferably, the swirling device 153 may be a swirling blade.

With continued reference to fig. 1 and 4, the cyanide containing exhaust treatment device 100 is also provided with other working components, such as a support 128, and the support 128 may be a sliding support and/or a fixed support. For example, the flame hearth 126 is provided with 2 fire holes 134 and 1 sliding support. The oxidation furnace 127 interval is provided with 4 fire holes 134, and the afterbody is provided with 1 manhole 129, and the bottom is provided with 1 fixed bolster and 2 sliding support, and first support 128 is fixed bolster, and other 2 are sliding support. It will be appreciated that the fire viewing holes 134 are provided to facilitate viewing of the cyanide-containing exhaust gas treatment process, and the manholes 129 are provided to facilitate servicing of the incinerator 120. The positions and the number of the fire observation holes 134, the supports 128 and the manholes 129 can be flexibly set according to specific working conditions and specific requirements.

The design of the incineration process parameters of the cyanide waste gas treatment device 100 is obtained by analyzing the incineration characteristic data of each waste gas and combining the design experience data of the cyanide waste gas and the incinerator 120, for example, the NO is affected _x The main factors generated are the incineration temperature and the oxygen content of the flue gas, and experiments show that the hearth temperature is higher than 1300 ℃ and the NO in the flue gas _x Can obviously increase, and has an increasing trend along with the increase of the temperature; NO when oxygen content of flue gas is higher than 5% _x Will increase significantly, the more oxygen content will produce NO _x The more the utility model adopts the fuel staged combustion technology, the lower the incineration temperature. On the other hand, the organic matters can be burnt step by step, the smoke quantity and the heat load are slowly increased, the high-temperature area is dispersed, the temperature field in the furnace is relatively uniform, and the NO is effectively inhibited _x And (5) generating. Optionally, the incineration process parameters of the cyanide waste gas treatment device 100 are specifically as follows: the operation temperature is 900-1150 ℃; the temperature of the wall surface of the shell 139 is 60-100 ℃. The burner 124 load is about 1-10 MW. Under normal working conditions, the residence time of the flue gas in the hearth is 1.25-2.5 s. Since the constant diameter furnace body of the incinerator 120 is long (see fig. 1 and 4), the temperature field in the incinerator 120 in the initial stage of combustion is uneven and unstable, so that the incinerator 120 needs to perform the baking operation before the combustion starts in order to reach a relatively uniform temperature field in the incinerator 120 as soon as possible after the combustion starts, and the time required for baking and the required temperature can be determined according to specific working conditions.

The process parameters in the preferred embodiment are as follows: the power of the burner 124 is 5MW and the natural gas treatment capacity is 20-500 Nm ³ And/h, the temperature of the flue gas in the incinerator 120 is 1100 ℃, and the temperature of the wall surface of the shell 139 is 70 ℃. In order to control parameters during operation of the incinerator 120, optionally,the flame hearth 126 is provided with 2 thermocouple interfaces 135; the oxidation furnace 127 is provided with 3 thermocouple interfaces 135 in the middle, 6 thermocouple interfaces 135 in the tail, and 3 pressure transmitter interfaces 136 in the tail. It will be appreciated that the placement and number of thermocouple interfaces 135 and pressure transmitter interfaces 136 can be flexibly set according to specific conditions and specific needs.

The flame hearth 126 and the oxidation hearth 127 of the incinerator 120 are provided with a shell 139 and a lining 138, and the thickness and the material of the shell 139 and the lining 138 are required to be certain, so that the requirements of combustion conditions of the flame hearth 126 and the oxidation hearth 127 can be met, for example, the flame hearth 126 and the oxidation hearth 127 are required to have proper thickness and good heat resistance. Preferably, the thickness of the lining 138 is 200-400 mm, and the lining 138 is designed in a layered and segmented mode, and the temperature resistance of the inner wall of the lining 138 is required to be 100-300 ℃ higher than the temperature of the incineration flue gas. The lining 138 requires, in order from inside to outside: high temperature resistant material and heat insulating material. For example, the thickness of the shell 139 is 14mm, the material of the shell 139 is Q245R, the thickness of the lining 138 is 300mm, and the material of the lining 138 is heavy mullite, light mullite and fiber cotton (such as ceramic fiber board) from inside to outside. It will be appreciated that other thicknesses and materials of the housing 139 and liner 138 may be selected to meet the combustion conditions of the flame hearth 126 and the oxidation hearth 127.

Alternatively, the wall temperature of the housing 139 of the incinerator 120 is 60 to 100 ℃. In order to prevent the scalding of the personnel, a protective cover 122 can be arranged on the outer side of the shell 139, an air interlayer is formed between the shell 139 and the protective cover 122, and the structure is set according to the actual technological requirement.

It will be appreciated that the cyanide containing exhaust treatment device 100 according to the present utility model can treat different kinds of exhaust at the same time, and only the exhaust spray gun 140 needs to be distributed according to actual process requirements.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the utility model. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.

The present utility model has been described by way of the above embodiments, but it should be understood that the above embodiments are for illustrative and explanatory purposes only and that the utility model is not limited to the above embodiments, but is capable of numerous variations and modifications in accordance with the teachings of the utility model, all of which fall within the scope of the utility model as claimed.

Claims (10)

1. A cyanide-containing exhaust gas treatment device, comprising:

the incinerator comprises a divergent shoulder, wherein the divergent shoulder is provided with a plurality of air channels;

at least one air ring box disposed circumferentially outside of the diverging shoulder, the air ring box being in communication with the diverging shoulder via a plurality of the air passages;

the spray guns are inserted into the corresponding air channels through the air ring boxes, and the spray guns comprise at least one stage of waste gas spray gun and at least one stage of fuel spray gun;

the spray guns are arranged at different levels along the axial direction of the incinerator at intervals, each level of spray guns comprises a plurality of spray guns arranged at intervals along the circumferential direction of the incinerator, the spray guns are provided with projections on a plane perpendicular to the axial direction, and the projections of the spray guns at different levels are staggered in the circumferential direction.

2. The cyanide containing exhaust gas treatment device according to claim 1, wherein,

each stage of the fuel lance is disposed between two adjacent stages of the exhaust lances; and/or

The one stage exhaust lance is disposed upstream of the corresponding one stage fuel lance.

3. The cyanide containing exhaust gas treatment device according to claim 1, wherein an angle α between a central axis Axi of the lance and a central axis Ax of the incinerator is 10 ° or more and 90 ° or less.

4. A cyanide-containing exhaust gas treatment device according to claim 3, wherein the included angle α of the lances of different stages is the same and/or the included angle α of the lances of the same stage is the same.

5. The cyanide containing exhaust gas treatment device according to claim 1, wherein a central axis Axi of the lance and a circumferential surface of the air ring box have an intersection Pi, the incinerator has a radial line Li extending through the intersection Pi, and an angle β of-30 ° β.ltoreq.β.ltoreq.30° with a central axis Axi of the lance is included in the radial line Li.

6. The cyanide containing exhaust gas treatment device according to claim 5, wherein the included angle β of the spray guns of different stages is the same or different and/or the included angle β of the spray guns of the same stage is the same.

7. The cyanide containing exhaust gas treatment device according to any one of claims 1 to 6,

the number of spray guns being different in different stages and/or

The number of the exhaust gas spray guns at the downstream stage is greater than the number of the exhaust gas spray guns at the upstream stage; and/or

The number of the spray guns of each stage is 2-30.

8. The cyanide containing exhaust gas treatment device according to any one of claims 1 to 6,

the spray gun comprises two or more air ring boxes, wherein each stage of spray gun is correspondingly arranged on one air ring box, and each air ring box is provided with at least two air inlets; or alternatively

The spray gun comprises an air ring box, wherein at least two stages of spray guns are arranged on the air ring box, and the air ring box is provided with at least two air inlets.

9. The cyanide containing exhaust gas treatment device according to any one of claims 1 to 6, wherein the incinerator further comprises a burner provided at a front end of the incinerator.

10. A cyanide containing exhaust treatment device according to any one of claims 1 to 6, wherein the air passage is provided with swirl means through which the lance extends.