CN115405936A - A method and equipment for incinerating industrial hazardous waste - Google Patents

Abstract

The invention relates to the technical field of environmental protection, and provides a method and equipment for carrying out incineration treatment on industrial hazardous waste, which comprises the following steps: analyzing the characteristics of different hazardous wastes by a test analysis method, and matching solid mixtures, high-calorific-value waste liquid and low-calorific-value waste liquid which are compatible with each other and meet the set low calorific value; respectively introducing auxiliary fuel and air into the kiln head of the rotary kiln and the lower end of the secondary combustion chamber for combustion, so that the temperature of the rotary kiln and the temperature of the secondary combustion chamber reach the required temperature range; conveying the solid mixture after compatibility to a rotary kiln for incineration, and simultaneously spraying low-calorific-value waste liquid to the front end of the rotary kiln for auxiliary combustion; flue gas generated in the rotary kiln enters a secondary combustion chamber through a kiln tail for secondary incineration, and high-heat-value waste liquid is sprayed to the bottom of the secondary combustion chamber for auxiliary combustion; the invention can reduce the consumption of auxiliary fuel and the production cost by respectively spraying the low-calorific-value waste liquid and the high-calorific-value waste liquid into the rotary furnace and the secondary combustion chamber for auxiliary combustion.

Description

A method and equipment for incinerating industrial hazardous waste

technical field

The invention relates to the technical field of environmental protection, in particular to a method and equipment for incinerating hazardous industrial waste.

Background technique

Industrial hazardous waste refers to hazardous waste discharged during industrial production, including solid waste and liquid waste. Because hazardous waste contains high levels of heavy metals and is corrosive and toxic, random discharge and storage will damage the ecological environment and affect human health. Therefore, industrial hazardous waste usually needs to be recycled and treated in a unified manner. At present, the treatment of industrial hazardous waste is usually to send the solid waste to the rotary kiln for incineration, and send the flue gas generated by the incineration to the secondary combustion chamber for further incineration, while the liquid waste is purified by chemical methods such as dosing reaction In this method, auxiliary fuels such as diesel and natural gas need to be injected into the rotary kiln and the secondary combustion chamber for auxiliary combustion to ensure the incineration temperature of the solid waste, and the combustible liquid waste can also be injected into the rotary kiln and the secondary combustion chamber. The auxiliary combustion is purified by chemical methods, which causes waste of materials, increases the consumption of auxiliary fuels such as diesel and natural gas, and increases production costs.

Contents of the invention

The problem solved by the invention is how to send the combustible liquid waste into the rotary kiln and the secondary combustion chamber for auxiliary combustion, so as to reduce the consumption of auxiliary fuel and reduce the cost.

In order to solve the above problems, in a first aspect, the present invention provides a method for incinerating hazardous industrial waste, comprising the following steps:

The characteristics of different hazardous wastes are analyzed by means of laboratory analysis, and the solid mixture, high calorific value waste liquid and low calorific value waste liquid are compatible with each other and meet the set low calorific value;

Feed auxiliary fuel and air into the kiln head of the rotary kiln and the lower end of the second combustion chamber for combustion, so that the temperature of the rotary kiln and the temperature of the second combustion chamber can reach the required temperature range;

Transport the compounded solid mixture to the rotary kiln for incineration, and at the same time spray mist low calorific value waste liquid to the front of the rotary kiln to assist combustion;

The flue gas produced in the rotary kiln enters the secondary combustion chamber through the kiln tail for secondary combustion, and sprays mist-like waste liquid with high calorific value into the bottom of the secondary combustion chamber to assist combustion.

Optionally, transporting the compounded solid mixture to the rotary kiln for incineration, and spraying sprayed low calorific value waste liquid to the front of the rotary kiln to assist combustion includes:

The solid mixture is controlled to slide intermittently to the front end of the rotary kiln through the water-cooled chute;

Push the solid mixture falling to the front of the kiln head into the rotary kiln for incineration through the pusher, and at the same time, the rotation of the rotary kiln drives the solid mixture to spread in the rotary kiln and move to the kiln tail;

Spray misty low calorific value waste liquid into the front end of the rotary kiln for combustion, and gradually adjust the amount of low calorific value waste liquid and fuel, so that low calorific value waste liquid gradually replaces fuel to assist in controlling the temperature of the rotary kiln;

Adjust the rotating speed of the rotary kiln to control the moving speed of the solid mixture so that the residence time of the solid mixture in the rotary kiln is not less than the preset time.

Optionally, the step of controlling the intermittent sliding of the solid mixture to the front end of the rotary kiln through the water-cooled chute includes: the solid mixture is a bulk solid mixture;

The solid mixture is conveyed from the upper end of the water-cooled chute to the vertical section of the water-cooled chute through the chain conveyor, and the three hydraulic sealing doors set on the vertical section are opened sequentially and only one hydraulic sealing door is opened at a time to make the solid mixture Gradually fall into the inclined section of the water-cooled chute;

The solid mixture falling into the inclined section slides down to the front end of the rotary kiln head along the inclined section, wherein the inclined section's inclination angle is greater than 45 degrees, and the outer wall of the inclined section is provided with a water-cooled jacket.

Optionally, the step of controlling the intermittent sliding of the solid mixture to the front end of the rotary kiln through the water-cooled chute includes: the solid mixture is a barrel or bagged solid mixture;

The solid mixture is lifted to the lower end of the vertical section of the water-cooling chute by the elevator, and the sealing gate set on the side of the water-cooling chute and a hydraulic sealing door at the bottom of the water-cooling chute are opened in turn, so that the solid mixture gradually enters the water-cooling chute from the side of the water-cooling chute in the inclined section;

The solid mixture falling into the inclined section slides down to the front of the kiln head of the rotary kiln along the inclined section.

Optionally, transporting the compounded solid mixture to the rotary kiln for incineration, and spraying mist low-calorific value waste liquid to the front of the rotary kiln to assist combustion also includes:

If the temperature of the rotary kiln cannot be met by relying on the combustion of low calorific value waste liquid, then spray mist high calorific value waste liquid to the front of the rotary kiln to assist combustion to ensure the temperature of the rotary kiln;

If the temperature of the rotary kiln still cannot meet the requirements after spraying high calorific value waste liquid into the rotary kiln for combustion, inject auxiliary fuel into the rotary kiln for auxiliary temperature control.

Optionally, the flue gas generated in the rotary kiln enters the secondary combustion chamber through the kiln tail for secondary incineration, and spraying mist-like waste liquid with high calorific value to the bottom of the secondary combustion chamber to assist combustion includes:

The flue gas in the rotary kiln is moved to the kiln tail by the induced draft fan, and the flue gas passes through the kiln tail and enters the second combustion chamber from the bottom of the second combustion chamber for secondary incineration;

The flue gas in the secondary combustion chamber is blown by the secondary combustion-supporting fan set in a predetermined way to move the flue gas upward along a spiral trajectory to ensure the air flow rate and prolong the residence time of the flue gas in the secondary combustion chamber;

The high-calorific value waste liquid is homogenized and atomized, and then sprayed into the bottom of the secondary combustion chamber through the spray gun for combustion, and the amount of high-calorific waste liquid and fuel is gradually adjusted so that the high-calorific value waste liquid gradually replaces the fuel to assist in controlling the secondary combustion room temperature.

Optionally, the setting method of the secondary combustion fan set in the predetermined way is:

The secondary combustion-supporting fan is arranged at the lower end of the secondary combustion chamber, and multiple injection ports of the secondary combustion-supporting fan are arranged obliquely along the circumference at the same height, so that the ejected air flows around a circular direction in the center of the secondary combustion chamber.

Optionally, a method for incinerating hazardous industrial waste further includes the following steps:

The flue gas after secondary incineration is initially cooled to the first temperature through the waste heat boiler, and at the same time, the urea aqueous solution of a predetermined concentration is sprayed into the specific temperature section of the waste heat boiler through the SNCR denitrification process to remove nitrogen oxides in the flue gas;

The flue gas after the initial cooling is cooled to the second temperature in a short time by spraying quenching water with a two-fluid atomizing spray gun through the quenching tower;

In the dry deacidification tower, through the Venturi effect, the flue gas after cooling down again is contacted and mixed with the deacidification agent to perform dry deacidification of the flue gas;

The flue gas after dry deacidification is discharged after passing through the bag filter. During this process, the flow rate of the flue gas in the bag filter is controlled by the induced draft fan, so that the bag filter removes the solid particles in the flue gas.

Optionally, the following steps need to be carried out during the process of discharging the flue gas after dry deacidification through the bag filter:

Spray activated carbon powder in the inlet flue of the bag filter, so that the activated carbon powder flows with the flue gas to absorb dioxins and heavy metals in the flue gas;

The steam generated by the waste heat boiler is passed into the heat tracing pipe set on the ash hopper of the bag filter to control the temperature of the ash hopper within a predetermined range;

The ash hopper is blown back by the air cannon set in the ash hopper according to the predetermined frequency.

Optionally, a method for incinerating hazardous industrial waste further includes the following steps:

The flue gas filtered by the bag filter is passed into the pre-cooler, and the flue gas is cooled for the third time by spraying, so that the temperature of the flue gas drops to the third temperature;

The flue gas after the third cooling is passed into the bottom of the wet deacidification tower, and during the upward movement of the flue gas, it contacts and reacts with the lye sprayed on the top of the wet deacidification tower to remove the acidic components in the flue gas.

Compared with the prior art, the present invention conducts laboratory analysis on the characteristics of different hazardous wastes, and according to the laboratory analysis results, various hazardous wastes are compatible to produce solid mixtures that are compatible with each other and meet the set low calorific value and high calorific value waste liquid. and low calorific value waste liquid; then respectively feed air and auxiliary fuels such as diesel, natural gas, etc. into the rotary kiln and the secondary combustion chamber and ignite them to burn the auxiliary fuel, thereby raising the temperature of the rotary kiln and the secondary combustion chamber to make the temperature Respectively rise to the range required by each; then the solid mixture that has been compatible is transported to the rotary kiln for incineration, and in the process, low calorific value waste liquid is sprayed on the front end of the rotary kiln for auxiliary combustion, and the auxiliary combustion of low calorific value waste liquid It can assist in controlling the temperature of the rotary kiln, so that the temperature of the rotary kiln can be controlled by reducing the use of auxiliary fuel, so as to reduce the use of auxiliary fuel and reduce energy consumption; the flue gas generated in the rotary kiln will enter the secondary combustion chamber for secondary incineration , during this process, mist high calorific value waste liquid is sprayed into the secondary combustion chamber to assist combustion, and the auxiliary combustion of high calorific value waste liquid can assist in controlling the temperature of the secondary combustion chamber, thereby reducing the use of auxiliary fuel to control the temperature of the secondary combustion chamber , to reduce the use of auxiliary fuel and further reduce energy consumption; through compatibility, the waste liquid with low calorific value and the waste liquid with high calorific value are separated and stored separately, and low-heat waste liquid is sprayed into the rotary kiln and the second combustion chamber during the temperature control process. Value waste liquid and high calorific value waste liquid are used to assist temperature control, so as to assist temperature control by reducing the use of auxiliary fuel, thereby reducing the amount of auxiliary fuel and reducing costs.

In the second aspect, the present invention also provides a device for incinerating hazardous industrial waste, which is suitable for the above method, including a rotary kiln, a secondary combustion chamber, a waste heat Boiler, quenching tower, dry deacidification tower, bag filter, induced draft fan and vent chimney; feeding device and water-cooled chute are set at the kiln head of the rotary kiln, and the lower end of the water-cooled chute is provided with a pusher, which is used for The solid mixture at the lower end of the water-cooled chute is pushed into the rotary kiln; the low calorific value waste liquid spray gun is installed at the front end of the rotary kiln; the high calorific value waste liquid spray gun is installed at the bottom of the secondary combustion chamber; the waste heat boiler is connected with the urea spraying device, and the bag dust collector The inlet flue is connected to the activated carbon spraying device; the outlet of the bag filter is connected to the inlet of the precooler, the outlet of the precooler is connected to the inlet of the wet deacidification tower, and the outlet of the wet deacidification tower is connected to the inlet of the induced draft fan connect.

Thus, a device for incinerating hazardous industrial waste is used to realize the above-mentioned method for incinerating hazardous industrial waste, and thus at least has all the technical effects of the above-mentioned method for incinerating hazardous industrial waste.

Description of drawings

Fig. 1 is the flowchart of the method for incinerating hazardous industrial waste according to an embodiment of the present invention;

Fig. 2 is a connection diagram of various components of the device for incinerating hazardous industrial waste according to the embodiment of the invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, or It can be a detachable connection or an integral connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the description of this specification, descriptions with reference to the terms "an embodiment", "an embodiment" and "an implementation" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in this specification. In at least one embodiment or implementation of the invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

In order to solve the above problems, as shown in Figure 1, an embodiment of the present invention provides a method for incinerating hazardous industrial waste, including the following steps:

S1: Analyze the characteristics of different hazardous wastes by means of laboratory analysis, and combine solid mixtures that are compatible with each other and meet the set low calorific value, as well as high calorific value waste liquid and low calorific value waste liquid;

S2: Feed auxiliary fuel and air into the kiln head of the rotary kiln and the lower end of the second combustion chamber for combustion, so that the temperature of the rotary kiln and the temperature of the second combustion chamber reach the required temperature range;

S3: Transport the compounded solid mixture to the rotary kiln for incineration, and at the same time spray mist low calorific value waste liquid to the front of the rotary kiln to assist combustion;

S4: The flue gas generated in the rotary kiln enters the secondary combustion chamber through the kiln tail for secondary incineration, and sprays mist-like waste liquid with high calorific value to the bottom of the secondary combustion chamber to assist combustion.

It should be noted that in step S1, since there are many types of industrial hazardous wastes and are relatively complicated, it is necessary to test and analyze the nature, composition, content of dangerous elements, calorific value, moisture content, etc. of various industrial hazardous wastes. And according to the results of the test and analysis, the compatibility of various industrial hazardous wastes is carried out. The compatibility referred to here is the compatibility of various industrial hazardous wastes, that is, before the hazardous wastes are incinerated in the rotary furnace, according to the nature and composition of each hazardous waste The principle of matching parameters such as heat value and calorific value is to achieve the stable operation of the incineration system; the compatible industrial hazardous wastes should meet the compatibility with each other, that is, the compatible industrial hazardous wastes should avoid generating a large amount during the mixing process Heat, explosion, flammable and poisonous gas, etc., which may affect safety; the solid wastes after the completion of compatibility are mixed to form a solid mixture. , set the lower calorific value to 3000-4000kcal/kg, so that the temperature in the rotary kiln can be guaranteed after the solid mixture is burned normally, and the amount of auxiliary fuel can be reduced; the combustible liquid waste is classified and compatible according to the calorific value, respectively Compatible with high calorific value waste liquid and low calorific value waste liquid, high calorific value waste liquid is liquid waste with calorific value higher than 6000kcal/kg, low calorific value waste liquid is liquid waste with calorific value lower than 6000kcal/kg, high calorific value waste liquid and low calorific value The value of the waste liquid also needs to meet the pH between 4-10, and the flash point is greater than 60°C, so as to reduce the corrosion of liquid waste on the rotary kiln and the second combustion chamber and ensure the stability of its combustion in the rotary kiln and the second combustion chamber;

In step S2, after the completion of the compatibility of industrial hazardous waste, the industrial hazardous waste needs to be incinerated through the rotary kiln and the second combustion chamber, so it is necessary to feed air and auxiliary fuels such as diesel oil and natural gas into the rotary kiln and the second combustion chamber respectively And ignite to make the auxiliary fuel burn, and gradually increase the intake of auxiliary fuel and air in proportion to raise the temperature of the rotary kiln and the second combustion chamber respectively, so that the temperature reaches the required range respectively. The temperature range of the rotary kiln is 850 -1000℃, the temperature range of the secondary combustion chamber is 1100-1250℃;

In step S3, after the temperature of the rotary kiln is qualified, the solid mixture that has been compatible is transported to the rotary kiln for incineration, and the harmful components in the solid mixture are oxidized and decomposed, thereby removing the harmful components in the solid mixture , and at the same time spray low calorific value waste liquid into the front end of the rotary kiln for auxiliary combustion. The value waste liquid burns more fully and makes the temperature change in the rotary kiln more stable; since the solid mixture and the low calorific value waste liquid both have a certain calorific value, when the feed amount of the solid mixture must be the same as the temperature range of the rotary kiln , increasing the low calorific value waste liquid for combustion can reduce the use of auxiliary fuel in the rotary kiln, reduce production costs, and at the same time consume liquid waste and reduce the pressure on liquid waste treatment;

In step S4, the solid mixture will produce flue gas after burning in the rotary kiln. The flue gas in the secondary combustion chamber will be incinerated a second time to further decompose and oxidize the harmful components in the flue gas; during this process, mist-like high calorific value can be sprayed into the secondary combustion chamber from the bottom of the secondary combustion chamber The waste liquid carries out auxiliary combustion, and the sprayed high-calorific value waste liquid becomes mist, which can make the high-calorific value waste liquid cover a wide range and spread evenly in the secondary combustion chamber, so that the high-calorific value waste liquid can be burned more fully and the temperature in the secondary combustion chamber can be changed. More stable, because the high calorific value waste liquid has a higher calorific value, when the temperature range of the secondary combustion chamber is constant, increasing the high calorific value waste liquid for combustion can reduce the amount of auxiliary fuel used in the secondary combustion chamber, further reducing production costs, and at the same time The liquid waste is consumed to further reduce the pressure of liquid waste treatment.

Since the temperature in the rotary kiln and the secondary combustion chamber needs to be controlled within the required range to fully oxidize and decompose the solid mixture and flue gas in it, it is usually necessary to feed auxiliary fuels such as diesel and natural gas into the rotary kiln and the secondary combustion chamber etc. to carry out auxiliary combustion to control the temperature in the rotary kiln and the second combustion chamber to meet the requirements; the present invention conducts auxiliary combustion by feeding low calorific value waste liquid and high calorific value waste liquid into the rotary kiln and the second combustion chamber respectively to assist in controlling the rotary kiln and the second combustion chamber. The temperature of the second combustion chamber is used to reduce the amount of auxiliary fuel used for normal temperature control of the rotary kiln and the second combustion chamber, thereby saving energy and reducing production costs.

In one embodiment of the present invention, the said transporting the compounded solid mixture to the rotary kiln for incineration, and at the same time spraying mist low calorific value waste liquid to the front of the rotary kiln to assist combustion includes:

S31: Control the solid mixture to slide intermittently to the front end of the rotary kiln through the water-cooled chute;

S32: Push the solid mixture falling to the front end of the kiln head into the rotary kiln for incineration through the pusher, and at the same time, the rotation of the rotary kiln drives the solid mixture to spread in the rotary kiln and move to the kiln tail;

S33: Spray misty low calorific value waste liquid into the front end of the rotary kiln for combustion, and gradually adjust the amount of low calorific value waste liquid and fuel, so that low calorific value waste liquid gradually replaces fuel to assist in controlling the temperature of the rotary kiln;

S34: adjusting the rotating speed of the rotary kiln to control the moving speed of the solid mixture, so that the residence time of the solid mixture in the rotary kiln is not less than a preset time.

It should be noted that in step S31, the solid mixture enters the water-cooled chute before entering the rotary kiln, and the solid mixture is controlled by the water-cooled chute to slide down to the front end of the rotary kiln intermittently in batches, so as to avoid continuous feeding from causing the rotary kiln The flue gas inside leaks from the water-cooled chute;

In step S32, when the solid mixture slides from the water-cooled chute to the bottom of the water-cooled chute, it is located at the front end of the rotary kiln. Fully incinerated in the rotary kiln, the pusher is a hydraulically driven pusher, and the solid mixture entering the front end of the rotary kiln is continuously pushed into the rotary kiln through the reciprocating motion of the pusher; the solid mixture entering the rotary kiln The material is gradually spread in the rotary kiln under the rotation of the rotary kiln, so that the material layer of the solid mixture becomes thinner, which is beneficial to the thermal incineration of the solid mixture, so that the harmful components in the solid mixture can be more fully oxidized and decomposed At the same time, the solid mixture will move to the kiln tail with the rotation of the rotary kiln, and the completely incinerated solid mixture will be discharged from the lower end of the kiln tail;

In step S33, the combustible liquid wastes are matched according to the calorific value, and the high calorific value waste liquid and the low calorific value waste liquid are compatible, so that the liquid wastes with different calorific values can be fed into different devices for combustion; due to the requirements of the rotary kiln The temperature is lower than that of the secondary combustion chamber, so waste liquid with low calorific value is sprayed into the rotary kiln for combustion to assist in controlling the temperature of the rotary kiln, and waste liquid with high calorific value is sprayed into the secondary combustion chamber for combustion to assist in controlling the secondary combustion room temperature. After the low calorific value waste liquid is compatible, it is stored in the low calorific value waste liquid storage tank. When it needs to be sprayed into the rotary kiln, the low calorific value waste liquid is atomized by the waste liquid atomization pump and then sent to the front of the rotary kiln. The low calorific value spray gun sprays the low calorific value waste liquid into the rotary kiln for combustion. By atomizing the low calorific value waste liquid and spraying it into the rotary kiln, the low calorific value waste liquid can be sprayed into the rotary kiln. Sprinkle evenly inside, so as to make it burn fully; after the low calorific value waste liquid burns normally in the rotary kiln, gradually reduce the use of auxiliary fuel, and at the same time gradually increase the use of low calorific value waste liquid, and adjust the air intake accordingly , to ensure the normal combustion of low calorific value waste liquid and the temperature in the rotary kiln is in the range of 850-1000 ° C. The best state is to use no auxiliary fuel at all, and only use low calorific value waste liquid to assist in controlling the temperature of the rotary kiln, thereby reducing the auxiliary fuel consumption. Quantity and consumption of liquid waste to reduce production costs;

In step S34, during the incineration process of the solid mixture in the rotary kiln, the moving speed of the solid mixture in the rotary kiln can be controlled by adjusting the rotating speed of the rotary kiln, and the rotating speed adjustment range of the rotary kiln is 0.05-1r/min, The adjustment of the rotating speed of the rotary kiln shall be such that the retention time of the solid mixture in the rotary kiln is not less than the preset time, and the preset time is 90 minutes, so that the solid mixture is fully incinerated in the rotary kiln to reduce its discretionary rate; In this way, the harmful components contained in the incinerated ash can be reduced, and part of the harmful components can be generated into flue gas and enter the secondary combustion chamber, where the secondary combustion chamber can incinerate the flue gas to reduce the harmful components in the flue gas again. The kiln and the second combustion chamber cooperate to incinerate the solid mixture to remove harmful components, thereby purifying the solid mixture.

In this embodiment, the following steps can also be performed:

S35: If the temperature of the rotary kiln cannot be met by relying on the combustion of waste liquid with low calorific value, then spray mist waste liquid with high calorific value to the front of the rotary kiln to assist combustion to ensure the temperature of the rotary kiln;

S36: If the temperature of the rotary kiln still cannot meet the requirements after injecting waste liquid with high calorific value into the rotary kiln for combustion, inject auxiliary fuel into the rotary kiln for auxiliary temperature control.

It should be noted that in step S35, since the composition of the solid mixture is relatively complex, some components are easy to burn, and some components are not easy to burn, so the calorific value of the solid mixture will fluctuate relatively greatly. In the temperature range, the amount of low calorific value waste liquid will also be adjusted accordingly; when the calorific value of the solid mixture is low and the temperature in the rotary kiln cannot be met by increasing the amount of low calorific value waste liquid, it can be installed at the front of the rotary kiln The high calorific value spray gun sprays high calorific value waste liquid into the rotary kiln for auxiliary combustion to assist in controlling the temperature of the rotary kiln and avoids the use of auxiliary fuel as much as possible to reduce costs; the high calorific value waste liquid needs to be homogenized before spraying. Spray into the rotary kiln after treatment, the spraying method of high calorific value waste liquid is the same as that of low calorific value waste liquid;

In step S36, when the solid mixture is not combustible or the calorific value of combustion is too low, and the temperature in the rotary kiln cannot be guaranteed by adding high calorific value waste liquid, auxiliary fuel can be injected into the rotary kiln to assist in controlling the rotary kiln. When the temperature in the rotary kiln can be maintained by solid mixture, waste liquid with low calorific value and waste liquid with high calorific value, the amount of auxiliary fuel used can be gradually reduced until it is not used to reduce costs.

In one embodiment of the present invention, the control of the intermittent sliding of the solid mixture to the front end of the rotary kiln through the water-cooled chute includes: the solid mixture is a bulk solid mixture;

The solid mixture is conveyed from the upper end of the water-cooled chute to the vertical section of the water-cooled chute through the chain conveyor, and the three hydraulic sealing doors set on the vertical section are opened sequentially and only one hydraulic sealing door is opened at a time to make the solid mixture Gradually fall into the inclined section of the water-cooled chute;

The solid mixture falling into the inclined section slides down to the front end of the rotary kiln head along the inclined section, wherein the inclined section's inclination angle is greater than 45 degrees, and the outer wall of the inclined section is provided with a water-cooled jacket.

It should be noted that the bulk solid mixture is mixed evenly in the material pit after compatibility, and then the mixed solid mixture is sent to the chain conveyor by the bridge crane, and the solid mixture is transported to the The upper end of the water-cooled chute, and the solid mixture enters the vertical section of the water-cooled chute. There are three hydraulic sealing doors at intervals from top to bottom on the vertical section of the water-cooling chute. The hydraulic sealing doors are used to seal the passage of the water-cooling chute. Avoid the leakage of flue gas in the rotary kiln from here and affect the environment; the solid mixture first falls on the uppermost hydraulic sealing door, and then open three hydraulic sealing doors from top to bottom and only open one hydraulic sealing door at a time, That is, first open the uppermost hydraulic sealing door to make the solid mixture fall to the middle hydraulic sealing door, then close the uppermost hydraulic sealing door, open the middle hydraulic sealing door to make the solid mixture fall to the bottom hydraulic sealing door, and then close The middle hydraulic sealing door opens the bottom hydraulic sealing door, so that the solid mixture gradually falls into the inclined section of the water-cooled chute; by opening three hydraulic sealing doors in sequence and only opening one hydraulic sealing door at a time, the feeding can Avoid the leakage of flue gas in the rotary kiln during the feeding process to reduce the impact on the environment;

The upper and lower ends of the inclined section are respectively connected with the lower end of the vertical section and the front end of the rotary kiln. The solid mixture slides down to the front end of the rotary kiln along the inclined section. The inclination angle of the inclined section is set to be greater than 45 degrees so that the solid mixture can be smoothly As the inclined section is close to the rotary kiln and is in a high-temperature environment, a water-cooled jacket is installed on the outer wall of the inclined section, and the temperature of the inclined section is cooled by passing cooling water into the water-cooled jacket to avoid thermal deformation of the inclined section And affect the decline of solid mixture.

Controlling the solid mixture to enter the rotary kiln intermittently through the water-cooled chute can prevent the flue gas generated in the rotary kiln from leaking from the water-cooled chute, and at the same time avoid the excessive amount of solid mixture entering the rotary kiln at one time, resulting in solid-state mixing Insufficient incineration of the material in the rotary kiln results in incomplete removal of harmful components in the solid mixture, thus affecting the effect of hazardous waste treatment.

In one embodiment of the present invention, the control of the solid mixture intermittently sliding down to the front end of the rotary kiln through the water-cooled chute includes: the solid mixture is a barrel or bagged solid mixture;

The solid mixture is lifted to the lower end of the vertical section of the water-cooling chute by the elevator, and the sealing gate set on the side of the water-cooling chute and a hydraulic sealing door at the bottom of the water-cooling chute are opened in turn, so that the solid mixture gradually enters the water-cooling chute from the side of the water-cooling chute in the inclined section;

The solid mixture falling into the inclined section slides down to the front of the kiln head of the rotary kiln along the inclined section.

It should be noted that due to the large volume of the solid mixture in barrels or bags, it is not convenient to use the chain conveyor to transport, and the vertical drop of the solid mixture in barrels or bags from the vertical section of the water-cooled chute will affect the hydraulic pressure. The sealed door causes damage, so the bucket or bagged solid mixture is conveyed upward to the lower end of the vertical section of the water-cooled chute by an elevator, and a sealed gate is set on the side of the lower end of the vertical section of the water-cooled chute, and the sealed gate is set in the middle Between the hydraulic sealing door and the lowermost hydraulic sealing door, the solid mixture enters the vertical section from the side of the vertical section and falls on the lowermost hydraulic sealing door by opening the sealing gate, and then closes the sealing gate to open the lowermost hydraulic sealing door. The hydraulic sealing door allows the solid mixture to fall into the inclined section; the sequential opening of the sealing gate and the bottom hydraulic sealing door can prevent the flue gas in the rotary kiln from leaking from here during the feeding process, so as to reduce the impact on the environment;

The solid mixture that falls to the inclined section slides down along the inclined section to the front end of the rotary kiln, so that the solid mixture is transported to the rotary kiln for incineration.

In one embodiment of the present invention, the flue gas generated in the rotary kiln enters the secondary combustion chamber through the kiln tail for secondary incineration, and spraying mist-like waste liquid with high calorific value to the bottom of the secondary combustion chamber to assist combustion includes:

S41: Use the induced draft fan to draw the flue gas in the rotary kiln to move towards the kiln tail, and make the flue gas pass through the kiln tail and enter the second combustion chamber from the bottom of the second combustion chamber for secondary incineration;

S42: Blow the flue gas in the secondary combustion chamber through the secondary combustion-supporting fan set according to the predetermined method to move the flue gas upward along a spiral trajectory, so as to ensure the flow rate of the air and prolong the residence time of the flue gas in the secondary combustion chamber;

S43: Homogenize the waste liquid with high calorific value and atomize it, spray it into the bottom of the secondary combustion chamber through a spray gun for combustion, and gradually adjust the amount of waste liquid with high calorific value and fuel, so that waste liquid with high calorific value gradually replaces fuel to assist control The temperature of the second combustion chamber.

It should be noted that, in step S41, the solid mixture will generate flue gas after being incinerated in the rotary kiln, and the flue gas will flow towards the kiln tail under the suction force of the induced draft fan, which is installed in the flue gas purification system and used to It is used to pump the flue gas flow in the whole system; the flue gas enters the secondary combustion chamber through the kiln tail of the rotary kiln. Since the secondary combustion chamber is already being burned by the auxiliary fuel, the flue gas will be secondarily incinerated after entering the secondary combustion chamber, further Oxidize and decompose the harmful substances in the flue gas to remove the harmful components in the flue gas;

In step S42, the flue gas enters the second combustion chamber from the bottom of the second combustion chamber, flows upward during the burning process in the second combustion chamber, and blows air into the second combustion chamber through the secondary combustion-supporting fan set according to a predetermined method. The incoming air flow mode can drive the flue gas in the secondary combustion chamber to move upward along the spiral trajectory, so that the moving trajectory of the flue gas in the secondary combustion chamber can be extended, and can be controlled by adjusting the flow rate of the blown air and adjusting the frequency of the induced draft fan. The flow velocity of the flue gas in the secondary combustion chamber is 30-50m/s, so that the residence time of the flue gas in the secondary combustion chamber is not less than 3.5S, so that the flue gas can fully mix and react with the air in the secondary combustion chamber, so that the flue gas The harmful components are completely decomposed;

In step S43, during the incineration process of the flue gas in the secondary combustion chamber, high calorific value waste liquid can be introduced into the secondary combustion chamber for auxiliary combustion to reduce the amount of auxiliary fuel; Carry out homogeneous treatment, the high calorific value waste liquid after homogeneous treatment is stored in the high calorific value waste liquid tank, when the high calorific value waste liquid is sprayed into the secondary combustion chamber, the high calorific value waste liquid is atomized by the waste liquid atomization pump It is sent to the high calorific value spray gun installed at the bottom of the secondary combustion chamber, and the high calorific value waste liquid is sprayed into the secondary combustion chamber through the high calorific value spray gun for combustion. The atomized high calorific value waste liquid can be sprayed evenly in the secondary combustion chamber to make it burn Sufficient; after the high calorific value waste liquid burns normally in the rotary kiln, gradually reduce the amount of auxiliary fuel used, and at the same time gradually increase the use of high calorific value waste liquid, and adjust the air intake accordingly to ensure the normal combustion of high calorific value waste liquid And the temperature in the secondary combustion chamber is in the range of 1100-1250°C. The best state is to use no auxiliary fuel at all, and only use high calorific value waste liquid to assist in controlling the temperature of the secondary combustion chamber, thereby reducing the amount of auxiliary fuel and consuming liquid waste , to reduce production costs.

In one embodiment of the present invention, the setting method of the secondary combustion fan set in the predetermined way is:

The secondary combustion-supporting fan is arranged at the lower end of the secondary combustion chamber, and multiple injection ports of the secondary combustion-supporting fan are arranged obliquely along the circumference at the same height, so that the ejected air flows around a circular direction in the center of the secondary combustion chamber.

It should be noted that the secondary combustion-supporting fan is arranged at the lower end of the second combustion chamber, and the multiple injection ports of the secondary combustion-supporting fan are arranged at the same height of the second combustion chamber along the circumference, and each injection port is tangent to an imaginary circle respectively. , so that the air blown out of each outlet flows in a circular direction, thereby driving the flue gas flowing through here to rotate, so that the flue gas moves upward along a spiral trajectory, so as to extend the moving path of the flue gas in the secondary combustion chamber , to prolong the residence time of the flue gas in the secondary combustion chamber. Since the temperature in the secondary combustion chamber is uniformly controlled within the range of 1100-1250°C, the prolongation of the residence time of the flue gas will increase the burning time of the flue gas, thereby making the flue gas It is more fully incinerated to more effectively remove harmful components in the flue gas.

In one embodiment of the present invention, a method for incinerating hazardous industrial waste further includes the following steps:

S5: Preliminarily cool the flue gas after secondary incineration to the first temperature through the waste heat boiler, and at the same time, spray urea aqueous solution of a predetermined concentration into the specific temperature section of the waste heat boiler through the SNCR denitrification process to remove nitrogen oxides in the flue gas;

S6: Spray quenching water through the quenching tower with a dual-fluid atomizing spray gun to cool down the initially cooled flue gas to the second temperature in a short time;

S7: In the dry deacidification tower, through the Venturi effect, the flue gas after cooling down again is contacted and mixed with the deacidification agent to perform dry deacidification of the flue gas;

S8: The flue gas after dry deacidification passes through the bag filter and then is discharged. During this process, the flow rate of the flue gas in the bag filter is controlled by the induced draft fan, so that the bag filter removes solid particles in the flue gas.

It should be noted that in step S5, the flue gas enters the waste heat boiler through the flue gas pipeline after being burned again in the second combustion chamber. The temperature of the flue gas is lowered; through the heat exchange between the flue gas and the soft water passed into the waste heat boiler, the temperature of the flue gas at the outlet of the waste heat boiler is controlled to drop to the first temperature by controlling the amount of soft water and the temperature of the soft water, and the first temperature is 530°C; After the gas is incinerated in the secondary combustion chamber, the harmful components in the flue gas are oxidized and decomposed, and the flue gas is initially purified, but nitrogen oxides will be produced. The urea aqueous solution of a predetermined concentration is sprayed into the section, and the nitrogen oxides in the flue gas are removed through the SNCR denitrification process, and the flue gas is purified. The specific temperature section is the temperature range of 950-1050°C, and the predetermined concentration is 10% of the urea content. urea solution; thus, through the continuous treatment of flue gas through the secondary combustion chamber and SNCR denitrification process, the harmful components in the flue gas can be reduced to a greater extent, and the purification effect of the flue gas can be improved;

In step S6, due to the high temperature of the flue gas entering the waste heat boiler, too much and too fast cooling of the flue gas through the waste heat boiler will cause damage to the waste heat boiler equipment due to the large temperature difference. Cooling, the temperature of the flue gas has been reduced to the second temperature through the cooperation of the waste heat boiler and the quenching tower, and the equipment can be protected; the flue gas after the preliminary cooling in the waste heat boiler enters the quenching tower through the flue gas pipe, and is set The dual-fluid atomizing spray gun at the top of the quenching tower sprays quenching water into the quenching tower, so that the flue gas is in direct contact with the atomized spray water. By controlling the amount of quenching water, the flue gas contacts with the water mist and vaporizes within 1S, quickly The temperature is lowered to the second temperature, the second temperature is 200°C±5°C to avoid the re-synthesis of dioxin-like substances, and the synthesis temperature of dioxin-like substances is 200-500°C;

In step S7, the flue gas cooled by the quenching tower enters the dry deacidification tower, and the acid components such as SO2, HCl, and HF in the flue gas are removed through the dry deacidification process; Venturi tube, after the flue gas entering the dry deacidification tower meets the deacidification agent such as slaked lime sprayed into the dry deacidification tower, when it flows through the throat of the venturi tube, due to the narrowing of the throat cross-sectional area, the smoke The flow velocity of the gas will increase, resulting in a highly turbulent flow, so that the flue gas and the deacidification agent can fully mix and react, and improve the removal effect of the acidic components in the flue gas;

In step S8, the flue gas after the dry deacidification treatment enters the bag filter, and is filtered by the bag filter to remove the solid particle impurities contained in the flue gas, and the filtered flue gas is discharged into the air through a chimney; In this process, the flue gas is cooled twice by the waste heat boiler and the quench tower to reduce its temperature to 200°C, which can avoid damage to the filter bag in the bag filter due to excessive flue gas temperature; An induced draft fan is set between them, and the flue gas generated in the rotary kiln is driven by the induced draft fan to flow through the secondary combustion chamber, the waste heat boiler, the quench tower, the dry deacidification tower and the bag filter, and then discharged through the chimney, and is controlled by the induced draft fan. The flow rate of the flue gas in the bag filter is 0.5-0.7m/min, so as to ensure the air flow rate in the bag filter per unit time, so as to ensure the filter efficiency of the bag filter for solid particles in the flue gas.

In one embodiment of the present invention, the following steps need to be carried out in the process of discharging the flue after dry deacidification through the bag filter:

Spray activated carbon powder in the inlet flue of the bag filter, so that the activated carbon powder flows with the flue gas to absorb dioxins and heavy metals in the flue gas;

The steam generated by the waste heat boiler is passed into the heat tracing pipe set on the ash hopper of the bag filter to control the temperature of the ash hopper within a predetermined range;

The ash hopper is blown back by the air cannon set in the ash hopper according to the predetermined frequency.

It should be noted that when the flue gas enters the bag filter, activated carbon powder can be sprayed into the inlet flue of the bag filter. The particle size of the activated carbon powder is 200 mesh, which can fully mix the activated carbon powder with the flue gas; spray into the flue The activated carbon powder will flow together with the flue gas, and after mixing with the flue gas, it will absorb the heavy metals and dioxins in the flue gas; The deacidification agent and activated carbon powder will be mixed into the inlet pipe of the dust collector. The unreacted deacidification agent and activated carbon powder will always flow into the bag filter along with the flue gas flow, and finally be adsorbed on the surface of the filter bag. Continue to react with the acidic components in the flue gas and adsorb dioxins and heavy metals, thereby improving the removal effect of acidic components, dioxins and heavy metals in the flue gas;

Because the flue gas is sprayed and cooled by the quenching tower before entering the bag filter, the flue gas contains relatively high moisture, and the solid particles in the flue gas filtered by the bag filter also contain more moisture; Moisture solid particles will fall into the ash hopper of the bag filter, which will make the solid particles wet after cooling down in the ash hopper, so that the solid particles will adhere to the side wall of the ash hopper, resulting in solid particles in the ash hopper Therefore, a heat tracing pipe can be installed on the wall of the ash hopper, and the steam generated by the waste heat boiler can be passed into the heat tracing pipe to heat the ash hopper to control the temperature of the ash hopper. Within the predetermined range, the predetermined range is greater than 140°C, so as to avoid the temperature of the solid particles falling into the ash hopper being too low and sticking to the wall of the ash hopper;

In order to further reduce the phenomenon of arching and dead bins in the ash hopper, multiple air cannons can be installed in the ash hopper, and the air cannons can be turned on at a predetermined frequency to blow back the ash hopper, blowing the solid particles on the ash hopper wall downward. Falling, reducing the adhesion of solid particles on the wall of the ash hopper; the established frequency can be 2h/time, and can also be adjusted according to the amount of ash.

In one embodiment of the present invention, a method for incinerating hazardous industrial waste further includes the following steps:

S9: The flue gas filtered by the bag filter is passed into the pre-cooler, and the temperature of the flue gas is lowered for the third time by spraying, so that the temperature of the flue gas drops to the third temperature;

S10: The flue gas after the third cooling is passed into the bottom of the wet deacidification tower, and during the upward movement of the flue gas, it contacts and reacts with the lye sprayed on the top of the wet deacidification tower to remove the acidity in the flue gas Element.

It should be noted that when the content of acidic components in the flue gas is high, the acidic components in the flue gas may not be completely removed after dry deacidification treatment. In order to further remove the acidic components in the flue gas, the flue gas may After the dust collector, a two-stage wet deacidification process is used to carry out wet deacidification of the flue gas.

In step S9, a pre-cooler is installed after the bag filter, so that the flue gas filtered by the bag filter enters the pre-cooler, and the flue gas is cooled for the third time by spraying in the pre-cooler. Reduce the temperature of the flue gas to the third temperature. The third temperature is 80°C. The temperature of 80°C is the optimum temperature for the acid-base reaction. The flue gas is cooled to 80°C through the pre-cooler, which is convenient for the flue gas to enter the wet degassing process. The acid tower can better react with the lye, so as to better remove the acidic components in the flue gas;

In step S10, the flue gas after the third cooling enters the wet deacidification tower from the bottom of the wet deacidification tower, and at the same time, the lye is sprayed downward from the top of the wet deacidification tower, so that the flue gas flows upward Contact and mix with lye during the process, so that the lye can neutralize the acidic components in the flue gas to further remove the acidic components in the flue gas; the flue gas after wet deacidification flows through the induced draft fan and is discharged from the chimney .

As shown in Figure 2, the embodiment of the present invention also provides a device for incinerating hazardous industrial waste, including a rotary kiln, a secondary combustion chamber, a waste heat boiler, Quenching tower, dry deacidification tower, bag dust collector, induced draft fan and vent chimney; the rotary kiln is used to incinerate the solid mixture to decompose and oxidize it. After the solid mixture is decomposed and oxidized, flue gas will be generated. Under the action of the fan, it enters the secondary combustion chamber through the kiln tail of the rotary kiln, and then flows through the waste heat boiler, the quench tower, the dry deacidification tower, the bag filter, the induced draft fan, and finally is released by the release chimney; among them, the flue gas is discharged from the secondary combustion chamber. The bottom of the combustion chamber enters, and after secondary combustion in the secondary combustion chamber, it flows out from the upper end of the secondary combustion chamber into the waste heat boiler; the flue gas enters the rapid cooling tower from the lower end of the rapid cooling tower after the initial cooling in the waste heat boiler, and is discharged from the rapid cooling tower The quenching water sprayed on the top rapidly cools the flue gas, and the rapidly cooled flue gas flows out from the upper end of the quenching tower and enters the dry deacidification tower from the bottom of the dry deacidification tower, and at the same time flows into the dry deacidification tower The deacidification agent is sprayed inside, and the acid components in the flue gas are removed through the mixed reaction of the flue gas and the deacidification agent; the flue gas after dry deacidification treatment enters the bag filter, and the smoke is filtered out through the filter bag in the bag filter. The solid particle impurities in the air, the filtered flue gas flows out of the bag filter and is pumped to the chimney for dissipation by the induced draft fan; after a series of purification and cooling treatments for the flue gas, it is vented to avoid the pollution of the flue gas to the environment .

Among them, the front end of the rotary kiln, that is, the position of the kiln head, is provided with a water-cooled chute, the lower end of the water-cooled chute is sealed and connected with the rotary kiln, and the upper end of the water-cooled chute is connected with the feeding device, and the solid mixture is transported into the water-cooled chute through the feeding device, thereby The solid mixture enters the front end of the rotary kiln from the water-cooled chute; a pusher is set at the lower end of the water-cooled chute, and the solid mixture entering the front end of the rotary kiln is pushed into the rotary kiln through the pusher, so that the rotary kiln can process the solid mixture Incineration; low calorific value spray guns and high calorific value spray guns are respectively installed at the front end of the rotary kiln and the bottom of the second combustion chamber, and the low calorific value waste liquid and high calorific value waste liquid are sprayed into the rotary kiln and the second combustion chamber respectively through the low calorific value spray guns and the high calorific value spray guns. Auxiliary combustion of waste liquid is used to assist in controlling the temperature of the rotary kiln and the secondary combustion chamber, and to consume liquid waste. At the same time, it can also reduce the amount of auxiliary fuel in the rotary kiln and the secondary combustion chamber to save energy consumption.

In addition, a urea spraying device is installed at the temperature range of 950-1050 ° C of the waste heat boiler, and the urea solution is sprayed into the waste heat boiler through the urea spraying device, so that the urea solution reacts with the flue gas of the waste heat boiler to remove nitrogen oxides in the flue gas ;Set an activated carbon spraying device at the inlet flue of the bag filter, and spray activated carbon powder into the flue through the activated carbon spraying device, so that the activated carbon powder is mixed with the flue gas in the flue gas to absorb dioxins and heavy metals in the flue gas; The precooler and the wet deacidification tower are connected. The inlet and outlet of the precooler are respectively connected to the outlet of the bag filter and the inlet of the wet deacidification tower through the flue gas pipeline, and the outlet of the wet deacidification tower is connected to the inlet of the induced draft fan. connection, when the acidic components in the flue gas after dry deacidification are unqualified, the flue gas can be deacidified again through a two-stage wet deacidification process to ensure that the acidic components in the flue gas are qualified, specifically : The flue gas filtered by the bag filter enters the pre-cooler from the lower end of the pre-cooler, and the pre-cooler cools the flue gas for the third time by spraying, so that the temperature of the flue gas drops to 80 degrees, reaching The optimum temperature for the acid-base neutralization reaction. The flue gas after the third cooling flows out from the upper end of the precooler into the wet deacidification tower, and is neutralized by the lye sprayed into the wet deacidification tower and the flue gas. And react to further remove the acidic components in the flue gas and improve the purification effect of the flue gas.

Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims (10)

1. A method for carrying out incineration treatment on industrial hazardous waste is characterized by comprising the following steps:

analyzing the characteristics of different hazardous wastes by a test analysis method, and matching solid mixtures, high-calorific-value waste liquid and low-calorific-value waste liquid which are compatible with each other and accord with a set low calorific value;

respectively introducing auxiliary fuel and air into the kiln head of the rotary kiln and the lower end of the secondary combustion chamber for combustion so as to respectively enable the temperature of the rotary kiln and the temperature of the secondary combustion chamber to reach the required temperature ranges;

conveying the solid mixture after compatibility into a rotary kiln for burning, and spraying vaporous low-calorific-value waste liquid to the front end of the rotary kiln for auxiliary combustion;

the flue gas generated in the rotary kiln enters the secondary combustion chamber through the kiln tail for secondary incineration, and atomized high-heat-value waste liquid is sprayed to the bottom of the secondary combustion chamber for auxiliary combustion.

2. The method for incinerating industrial hazardous waste according to claim 1, wherein the step of conveying the compatible solid mixture into a rotary kiln for incineration and spraying the low-calorific-value atomized waste liquid to the front end of the rotary kiln for auxiliary combustion comprises:

the solid mixture is controlled to intermittently slide to the front end of the rotary kiln through a water-cooled chute;

pushing the solid mixture which slides to the front end of the kiln head into a rotary kiln through a material pusher for burning, and simultaneously driving the solid mixture to spread in the rotary kiln and move towards the kiln tail through the rotation of the rotary kiln;

spraying the vaporific low-heat-value waste liquid into the front end of the rotary kiln for combustion, and gradually adjusting the consumption of the low-heat-value waste liquid and the fuel to ensure that the low-heat-value waste liquid gradually replaces the fuel to assist in controlling the temperature of the rotary kiln;

and adjusting the rotating speed of the rotary kiln to control the moving speed of the solid mixture, so that the retention time of the solid mixture in the rotary kiln is not less than the preset time.

3. The method for incinerating hazardous industrial waste according to claim 2, wherein the step of controlling the solid mixture to intermittently slide down to the front end of the rotary kiln through the water-cooled chute comprises: the solid mixture is bulk solid mixture;

conveying the solid mixture from the upper end of the water-cooling chute to the vertical section of the water-cooling chute by a chain plate conveyor, sequentially opening three hydraulic sealing doors arranged on the vertical section and only opening one hydraulic sealing door each time so that the solid mixture gradually falls into the inclined section of the water-cooling chute;

the solid mixture falling into the inclined section slides to the front end of the kiln head of the rotary kiln along the inclined section, wherein the inclination angle of the inclined section is larger than 45 degrees, and a water-cooling jacket is arranged on the outer wall of the inclined section.

4. The method for incinerating industrial hazardous waste according to claim 3, wherein the step of controlling the solid mixture to intermittently slide to the front end of the rotary kiln through the water-cooled chute comprises: the solid mixture is a barreled or bagged solid mixture;

lifting the solid mixture to the lower end of the vertical section of the water-cooling chute by a lifter, and sequentially opening a sealing gate arranged on the side surface of the water-cooling chute and a hydraulic sealing door at the lowest part of the water-cooling chute to ensure that the solid mixture gradually enters the inclined section of the water-cooling chute from the side surface of the water-cooling chute;

the solid mixture falling into the inclined section slides to the front end of the kiln head of the rotary kiln along the inclined section.

5. The method for incinerating industrial hazardous wastes according to claim 1, wherein the step of injecting the flue gas generated in the rotary kiln into a secondary combustion chamber through a kiln tail for secondary incineration and spraying a mist of high-calorific-value waste liquid to the bottom of the secondary combustion chamber for auxiliary combustion comprises the following steps:

the smoke in the rotary kiln is pumped by the induced draft fan to move towards the kiln tail, and the smoke enters the secondary combustion chamber from the bottom of the secondary combustion chamber after passing through the kiln tail to be subjected to secondary incineration;

the secondary combustion-supporting fan arranged according to a set mode blows the smoke in the secondary combustion chamber to enable the smoke to move upwards along a spiral track, so that the flow rate of air is ensured, and the retention time of the smoke in the secondary combustion chamber is prolonged;

and (3) homogenizing and atomizing the high-heat-value waste liquid, spraying the atomized high-heat-value waste liquid into the bottom of a secondary combustion chamber through a spray gun for combustion, and gradually adjusting the using amounts of the high-heat-value waste liquid and fuel to enable the high-heat-value waste liquid to gradually replace the fuel to assist in controlling the temperature of the secondary combustion chamber.

6. The method for incinerating industrial hazardous waste according to claim 5, wherein the secondary combustion fan is arranged in a predetermined manner by the following manner:

the secondary combustion-supporting fan is arranged at the lower end of the secondary combustion-supporting chamber, and a plurality of blowing openings of the secondary combustion-supporting fan are arranged in an inclined mode along the circumference at the same height, so that the sprayed air flows around the circular direction at the center of the secondary combustion-supporting chamber.

7. The method for incinerating hazardous industrial waste according to claim 1, further comprising the following steps:

primarily cooling the secondarily incinerated flue gas to a first temperature through a waste heat boiler, and simultaneously spraying urea aqueous solution with a set concentration to a specific temperature section of the waste heat boiler through an SNCR (selective non-catalytic reduction) denitration process to remove nitrogen oxides in the flue gas;

cooling the flue gas subjected to primary cooling to a second temperature again in a short time by adopting a manner that a double-fluid atomization spray gun sprays chilled water through a quench tower;

the flue gas after being cooled again is contacted and mixed with a deacidification agent through the Venturi effect in a dry deacidification tower so as to carry out dry deacidification on the flue gas;

and (3) discharging the flue gas after deacidification by the dry method after flowing through a bag-type dust remover, and controlling the flow velocity of the flue gas in the bag-type dust remover by using an induced draft fan in the process so that the bag-type dust remover removes solid particles in the flue gas.

8. The method for incinerating industrial hazardous wastes according to claim 7, wherein the following steps are further required in the process of discharging flue gas after deacidification by the dry method after flowing through a bag-type dust remover:

spraying activated carbon powder in an inlet flue of the bag-type dust collector, so that the activated carbon powder flows along with the flue gas to adsorb dioxin and heavy metals in the flue gas;

introducing steam generated by the waste heat boiler into a heat tracing pipeline arranged on an ash bucket of the bag-type dust collector so as to control the temperature of the ash bucket within a set range;

and carrying out back blowing on the ash bucket through an air cannon arranged in the ash bucket according to a set frequency.

9. The method for incinerating hazardous waste in accordance with claim 7, further comprising the steps of:

introducing the flue gas filtered by the bag-type dust collector into a precooler, and carrying out third cooling on the flue gas in a spraying mode to reduce the temperature of the flue gas to a third temperature;

and introducing the flue gas subjected to the third temperature reduction into the bottom of the wet-method deacidification tower, and carrying out contact reaction with alkali liquor sprayed from the top of the wet-method deacidification tower in the upward movement process of the flue gas so as to remove acid components in the flue gas.

10. An apparatus for burning industrial hazardous waste, which adopts the method for burning industrial hazardous waste according to any one of claims 1 to 9, and is characterized by comprising a rotary kiln, a secondary combustion chamber, a waste heat boiler, a quench tower, a dry deacidification tower, a bag-type dust collector, an induced draft fan and a diffusing chimney which are sequentially arranged along the flow direction of flue gas and are sequentially connected through a flue gas pipeline; the feeding device and the water-cooling chute are arranged at the kiln head of the rotary kiln, the lower end of the water-cooling chute is provided with a material pusher, and the material pusher is used for pushing the solid mixture at the lower end of the water-cooling chute into the rotary kiln; the low-calorific-value waste liquid spray gun is arranged at the front end of the rotary kiln; the high-calorific-value waste liquid spray gun is arranged at the bottom of the second combustion chamber; the waste heat boiler is connected with a urea spraying device, and an inlet flue of the bag-type dust collector is connected with an active carbon spraying device; the outlet of the bag-type dust collector is connected with the inlet of the precooler, the outlet of the precooler is connected with the inlet of the wet-method deacidification tower, and the outlet of the wet-method deacidification tower is connected with the inlet of the induced draft fan.

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