Stepped preheating furnace for treating solid waste garbage by using cement kiln

Abstract

A stepped preheating furnace for treating solid waste garbage through a cement kiln comprises a furnace body and a plurality of air cannons used for conveying gas into the furnace body, the furnace body comprises an air inlet section and a material conveying section, the air inlet section is provided with a pressure transmission used for monitoring air pressure and a booster fan used for keeping the air pressure stable, and gun nozzles of the air cannons are communicated with an air distribution box. And a plurality of first air outlet pipes capable of extending into the conveying section are arranged on the air distribution box in a communicating manner. Solid waste garbage in the stepped furnace can be prevented from blocking a nozzle of the air cannon, and the working effect of the air cannon is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste treatment, in particular to a step preheating furnace for treating solid waste by using a cement kiln. Background Art

[0002] Waste incineration is the main method of treating solid waste. When solid waste is incinerated, the flue gas produced contains pollutants. According to the nature of the pollutants, they can be divided into four categories: particulate matter, acidic gases, heavy metals and organic pollutants. These four types of substances have different degrees of harm to the environment depending on their quantity and nature.

[0003] Currently, the technology of co-disposing solid waste using cement kilns is widely used in waste incineration disposal. Co-disposing solid waste using cement kilns has obvious advantages in cost and pollution control. It can centrally treat solid waste and make full use of the calorific value of solid waste fossil fuels in the garbage to achieve harmless, resource-based and reduced disposal of solid waste and hazardous waste.

[0004] The step preheating furnace plays a key role in the use of cement kiln to dispose of solid waste and garbage technology, and in using garbage as an alternative fuel to reduce the energy consumption of cement production. Due to the shortcomings of the traditional step furnace structure and configuration, the step furnace is prone to blockage during the actual production process. Therefore, multiple air cannons are installed on the step preheating furnace. Using the principle of aerodynamics, the air pressure energy is converted into air jet kinetic energy to generate a strong impact force to prevent the solid waste in the step furnace from arching, blocking and stagnation. Due to gravity, some solid waste entering the step furnace will enter the nozzle of the air cannon and cause blockage, affecting the working effect of the air cannon. In serious cases, the air cannon needs to be shut down for treatment. Utility Model Content

[0005] In order to solve the problem in the prior art that the nozzle of the air cannon is blocked, which affects the working effect of the air cannon, the utility model provides a step preheating furnace for disposing of solid waste by using a cement kiln. The step preheating furnace is provided with a plurality of air cannons, and the nozzles of the air cannons are connected to a branch wind box, and the branch wind box is connected to a plurality of first air outlet pipes that can extend into the feeding section. This can prevent the nozzle of the air cannon from being blocked by solid waste in the step furnace, thereby improving the working effect of the air cannon.

[0006] The utility model adopts the following technical solution to solve the above-mentioned technical problems: a stepped preheating furnace for disposing solid waste by using a cement kiln, comprising a furnace body and a plurality of air cannons for conveying gas into the furnace body, the furnace body comprising an air inlet section and a feeding section, the air inlet section being provided with a pressure transmission device for monitoring air pressure and a booster fan for maintaining air pressure stability, the nozzle of the air cannon being connected with an air distribution box, the air distribution box being connected with a plurality of first air outlet pipes capable of extending into the feeding section.

[0007] As a further optimization of the utility model of a stepped preheating furnace that utilizes a cement kiln to dispose of solid waste: a baffle is fixedly connected to the outlet end of the first air outlet pipe, and an acute angle is formed between the length direction of the baffle and the length direction of the first air outlet pipe, and a through hole is provided on the side wall of the part of the first air outlet pipe extending into the furnace body, and the through hole faces the outside of the baffle on the other first air outlet pipes.

[0008] As a further optimization of the utility model of a stepped preheating furnace for disposing solid waste using a cement kiln: the angle between the baffle and the first air outlet pipe is 45°-60°.

[0009] As a further optimization of the utility model of a stepped preheating furnace for disposing solid waste using a cement kiln: the length of the baffle is smaller than the inner diameter of the first air outlet pipe opening.

[0010] As a further optimization of the utility model of a stepped preheating furnace for disposing solid waste using a cement kiln: the inner diameter of the through hole is larger than the inner diameter of the first air outlet pipe opening.

[0011] As a further optimization of the utility model of a stepped preheating furnace for disposing solid waste using a cement kiln: an air inlet pipe is arranged on the wind box, and the air inlet pipe is connected to the gun nozzle through a first flange.

[0012] As a further optimization of the utility model of a stepped preheating furnace for disposing of solid waste using a cement kiln: a plurality of second air outlet pipes corresponding one to one with the first air outlet pipes are connected to the wind box, and the first air outlet pipes are connected to the second air outlet pipes by a second flange.

[0013] As a further optimization of the utility model of a stepped preheating furnace for disposing solid waste using a cement kiln: a high-temperature baffle is arranged in the furnace body, and the high-temperature baffle is used to separate the stepped section and the inclined hearth section.

[0014] As a further optimization of the utility model of a stepped preheating furnace for disposing solid waste using a cement kiln: a carbon monoxide concentration monitoring device and a combustion-supporting fan are arranged on the side wall of the inclined furnace bed section, and when the carbon monoxide concentration exceeds a set value, the combustion-supporting fan is started.

[0015] Beneficial effect: The stepped preheating furnace is provided with a plurality of air cannons, the nozzles of the air cannons are connected with a branch wind box, and the branch wind box is connected with a plurality of first air outlet pipes which can extend into the feeding section. This can prevent the nozzles of the air cannons from being blocked by solid waste in the stepped furnace and improve the working effect of the air cannons. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the step preheating furnace of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the air cannon of the utility model;

[0019] Figure numerals: 1. air cannon, 101. gun nozzle, 2. wind box, 201. air inlet pipe, 202. second air outlet pipe, 203. first air outlet pipe, 2031. baffle, 2032. through hole, 3. second flange, 4. first flange, 5. furnace body, 501. air inlet section, 5011. pressure transmission unit, 5012. booster fan, 502. feeding section, 5021. step section, 5022. inclined hearth section, 5023. carbon monoxide concentration monitoring device, 5024. combustion-supporting fan, 503. high-temperature baffle. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further elaborated in detail below in conjunction with specific embodiments. The parts of the following embodiments of the present invention that are not described and disclosed in detail should be understood as existing technologies known or should be known to technical personnel in this field, such as the structure of the air cannon 1, the material of the wind box 2, the installation and material of the furnace body 5, the structure and installation method of the pressure transmission 5011, the structure and installation method of the booster fan 5012, the structure and installation method of the carbon monoxide concentration monitoring device 5023, the structure and installation method of the combustion-supporting fan 5024, and the material of the high-temperature baffle 503.

[0021] A step preheating furnace for treating solid waste using a cement kiln, such as Figure 1-3As shown, it includes a furnace body 5 and a plurality of air cannons 1 for conveying gas into the furnace body 5. The furnace body 5 includes an air inlet section 501 and a feeding section 502. The air inlet section 501 is provided with a pressure transmission 5011 for monitoring the wind pressure and a booster fan 5012 for maintaining the wind pressure stable. High-temperature hot air is introduced into the air inlet section 501. When the pressure transmission 5011 detects that the wind pressure is lower than the set value, the booster fan 5012 is started to maintain the wind pressure in the furnace body 5 stable. Solid waste materials are introduced into the feeding section 502. In order to prevent the accumulation of materials in each step section 5021 of the step preheating furnace, an air cannon 1 is provided for spraying and cleaning. Due to gravity, some solid waste entering the step preheating furnace will cause blockage to the nozzle 101 of the air cannon 1, affecting the working effect of the air cannon 1. Therefore, the nozzle 101 of the air cannon 1 is connected to the wind box 2, and the wind box 2 is connected to a plurality of first air outlet pipes 203 that can extend into the feeding section 502. The air of the air cannon 1 enters the wind box 2, and the wind box 2 diverts the air and transports it into the feeding section 502 through the first air outlet pipes 203. These gases can blow away the solid waste materials. When some solid waste falls into one of the first air outlet pipes 203, the other first air outlet pipes 203 can continue to be used to avoid complete blockage of the air cannon 1, thereby ensuring that the step furnace can operate continuously and stably without frequent shutdowns for maintenance.

[0022] After long-term use, some garbage enters the air box 2. In order to facilitate the removal of the air box 2 for cleaning, an air inlet pipe 201 is provided on the air box 2, and the air inlet pipe 201 is connected to the nozzle 101 through a first flange 4. The air box 2 is connected to a plurality of second air outlet pipes 202 corresponding to the first air outlet pipes 203, and the first air outlet pipes 203 and the second air outlet pipes 202 are connected through a second flange 3. When the air box 2 needs to be disassembled and replaced, the first flange 4 and the second flange 3 can be directly removed.

[0023] Due to gravity, some solid waste introduced from the feeding section 502 will fall into the nozzle 101 of the air cannon 1, and then enter the wind box 2, which will affect the use effect of the air cannon 1. Therefore, a baffle 2031 is fixedly connected to the outlet end of the first air outlet pipe 203, and the length direction of the baffle 2031 forms an acute angle with the length direction of the first air outlet pipe 203. The existence of the baffle 2031 can prevent solid waste from entering the air cannon 1. A through hole 2032 is provided on the side wall of the part of the first air outlet pipe 203 extending into the furnace body 5. The through hole 2032 faces the outside of the baffle 2031 on the other first air outlet pipes 203. Part of the wind delivered by the air cannon 1 can also be blown out through the through hole 2032, which can blow away the solid waste that slides down the baffle 2031 and avoid the accumulation of garbage on the inner wall of the step preheating furnace.

[0024] In order to ensure that solid waste can fall on the baffle 2031 and the baffle 2031 does not block the air outlet of the first air outlet pipe 203, the angle between the baffle 2031 and the first air outlet pipe 203 is 45°-60°, and the length of the baffle 2031 is smaller than the inner diameter of the first air outlet pipe 203. In order to ensure that the air volume passing through the through hole 2032 is large enough, the inner diameter of the through hole 2032 is larger than the inner diameter of the first air outlet pipe 203.

[0025] A high-temperature baffle 503 is provided in the furnace body 5. The high-temperature baffle 503 is used to separate the step section 5021 and the inclined hearth section 5022. The step section 5021 forms a drying chamber, and the inclined hearth section 5022 forms a primary combustion chamber. After the solid waste enters the drying chamber from the feeding section 502, the high-temperature hot air transmitted from the air inlet section 501 can preheat and dry the solid waste, and then the preliminarily preheated and dried solid waste is pushed into the primary combustion chamber through the air cannon 1. The side wall of the inclined hearth section 5022 is provided with a carbon monoxide concentration monitoring device 5023 and a combustion-supporting fan 5024. When the carbon monoxide concentration exceeds the set value, the combustion-supporting fan 5024 is started, so that the solid waste in the primary combustion chamber can reach the best state for combustion in the cement kiln tail decomposition furnace.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A step preheating furnace for treating solid waste using a cement kiln, comprising a furnace body (5) and a plurality of air cannons (1) for conveying gas into the furnace body (5), characterized in that: The furnace body (5) comprises an air inlet section (501) and a material conveying section (502); the air inlet section (501) is provided with a pressure transmission device (5011) for monitoring air pressure and a booster fan (5012) for maintaining stable air pressure; the nozzle (101) of the air cannon (1) is connected to a wind box (2); and the wind box (2) is connected to a plurality of first air outlet pipes (203) capable of extending into the material conveying section (502).

2. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 1, characterized in that: The outlet end of the first gas outlet pipe (203) is fixedly connected to a baffle (2031), and the length direction of the baffle (2031) forms an acute angle with the length direction of the first gas outlet pipe (203), and a through hole (2032) is provided on the side wall of the portion of the first gas outlet pipe (203) extending into the furnace body (5), and the through hole (2032) faces the outside of the baffle (2031) on the other first gas outlet pipe (203).

3. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 2, characterized in that: The included angle between the baffle plate (2031) and the first air outlet pipe (203) is 45°-60°.

4. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 2, characterized in that: The length of the baffle (2031) is smaller than the inner diameter of the opening of the first air outlet pipe (203).

5. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 2, characterized in that: The inner diameter of the through hole (2032) is greater than the inner diameter of the opening of the first air outlet pipe (203).

6. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 1, characterized in that: The air distribution box (2) is provided with an air inlet pipe (201), and the air inlet pipe (201) is connected to the gun nozzle (101) via a first flange (4).

7. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 1, characterized in that: The air distribution box (2) is connected to a plurality of second air outlet pipes (202) corresponding one to one with the first air outlet pipes (203), and the first air outlet pipes (203) and the second air outlet pipes (202) are connected via a second flange (3).

8. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 1, characterized in that: A high-temperature baffle (503) is provided in the furnace body (5), and the high-temperature baffle (503) is used to separate the step section (5021) and the inclined hearth section (5022).

9. The step preheating furnace for treating solid waste using a cement kiln as claimed in claim 8, characterized in that: The side wall of the inclined hearth section (5022) is provided with a carbon monoxide concentration monitoring device (5023) and a combustion-supporting fan (5024); when the carbon monoxide concentration exceeds a set value, the combustion-supporting fan (5024) is started.

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