System and method for disposing garbage fly ash

Abstract

The invention discloses a system and a method for treating garbage fly ash. The system comprises a heat exchange box, a dissolving tank, a coal conveying belt, a steel ball coal mill and a boiler hearth, a steam outlet is formed in the top of the heat exchange box, a material taking opening is formed in the bottom of the heat exchange box, the dissolving pond is connected with the heat exchange box through a connecting pipeline, a bottom outlet of the dissolving pond is connected with an inlet of the steel ball coal mill through a coal conveying belt, and an outlet of the steel ball coal mill is communicated with a boiler hearth. According to the system and the method, the garbage fly ash can be treated, and meanwhile, the operation safety of the boiler is ensured.

Description

Technical Field

[0001] The invention belongs to the field of solid waste disposal and relates to a system and method for disposing garbage fly ash. Background Art

[0002] Garbage fly ash mainly refers to the tiny particles captured by the flue gas purification system during the incineration of domestic waste, as well as the bottom ash settled at the bottom of the flue and chimney. These fly ashes usually contain a variety of chemicals and heavy metals, and improper handling may cause harm to the environment and human health. Garbage fly ash comes from the flue gas purification system during the incineration of domestic waste and is an important by-product of incineration. Garbage fly ash mainly includes Cl (chlorine), Ca (calcium), K (potassium), Na (sodium), Si (silicon), Al (aluminum), O (oxygen) and other elements.

[0003] At present, under the pressure of environmental pollution and resource shortage, the development of effective and economical fly ash treatment technology can not only reduce the environmental burden, but also realize the recycling of resources, which has important scientific value and social significance. The furnace temperature of coal-fired power plants can reach 1500℃, which can effectively decompose dioxins. They also have abundant heat, electricity and steam resources. Through technical transformation, they can use their own technical advantages and perfect environmental protection design to achieve clean and efficient disposal of garbage fly ash. Therefore, there is a good prospect for the coordinated disposal of garbage fly ash in coal-fired power plants. However, garbage fly ash has the characteristics of high chlorine. If it is directly mixed with coal, it will cause corrosion of the boiler water-cooled wall, affecting the safe operation of the boiler.

[0004] After searching, the prior art with publication number CN112792091A discloses a system and method for harmless treatment of waste fly ash resource utilization, which specifically includes a mixing device, a feeding belt conveyor, a molding device, a preheating furnace, a new hot melting furnace, a waste heat boiler power closed-loop system, and a flue gas treatment system connected in sequence; the feeding belt conveyor includes a feeding belt conveyor 1 and a feeding belt conveyor 2; the raw materials in the mixing device are evenly mixed according to a certain proportion, and are transported to the molding device for curing and molding through the feeding belt conveyor 1; the molding raw materials are continuously transported to the low-temperature preheating furnace for heating and preheating through the feeding belt conveyor 2, and then fall into the new hot melting furnace; the flue gas generated in the new hot melting furnace is introduced into the flue gas treatment system through the top outlet of the preheating furnace through the waste heat boiler power closed-loop system; the waste heat boiler power closed-loop system includes a waste heat boiler, the waste heat boiler uses the waste heat in the flue gas to generate electricity, the waste heat boiler is connected to the oxygen production station, and the outlet of the oxygen production station is connected to the pure oxygen nozzle and the burnout air nozzle through a pipeline to provide oxygen for the chemical and physical reactions in the new hot melting furnace. The characteristic of the prior art is that the garbage fly ash is first molded, and the molded raw materials are continuously sent to the low-temperature preheating furnace for preheating by a feeding belt conveyor and then fall into the new hot melting furnace. However, the problem that direct blending will cause corrosion of the boiler water-cooled wall is not fundamentally solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a system and method for disposing garbage fly ash, which can achieve the treatment of garbage fly ash while ensuring the safety of boiler operation.

[0006] To achieve the above-mentioned purpose, the system for treating fly ash of garbage of the present invention comprises a heat exchange box, a dissolution tank, a coal conveyor belt, a steel ball coal mill and a boiler furnace;

[0007] A steam outlet is provided at the top of the heat exchange box, a material taking port is provided at the bottom of the heat exchange box, the dissolving tank is connected to the heat exchange box through a connecting pipe, the bottom outlet of the dissolving tank is connected to the inlet of the ball mill through a coal conveyor belt, and the outlet of the ball mill is connected to the boiler furnace.

[0008] Furthermore, a water pump is provided on the connecting pipe.

[0009] Furthermore, the bottom outlet of the dissolving tank is connected to the inlet of the ball mill through a hydraulic gate, a plunger pump and a coal conveying belt.

[0010] Furthermore, it also includes a condenser, and the steam outlet is connected to the steam recovery port on the condenser inlet pipeline.

[0011] Furthermore, the exhaust pipe of the intermediate pressure cylinder in the steam turbine is connected to the inlet pipe of the condenser, and the hot well outlet of the condenser is connected to the condensation return water outlet.

[0012] Furthermore, it also includes a transport vehicle, which unloads the garbage fly ash into a dissolution tank.

[0013] Furthermore, it also includes a controller, which is connected to the control end of the stirring device, the control end of the water pump, the control end of the hydraulic plug door, the control end of the plunger pump, the control end of the coal conveyor belt and the control end of the ball mill.

[0014] The working method of the system for disposing garbage fly ash of the present invention comprises the following steps:

[0015] 1) Unload the garbage fly ash into the dissolution tank, add water and stir it thoroughly to fully dissolve the fly ash, then let it stand to allow the chloride-containing mixed liquid and the mud to separate, and then transport the chloride-containing mixed liquid to the heat exchange box for evaporation;

[0016] 2) Chloride industrial raw materials are discharged through the material taking port to remove the chlorine element in the garbage fly ash, and the steam generated during the evaporation process is transported to the steam recovery port;

[0017] 3) The mud at the bottom of the dissolution tank is transported to the coal conveyor belt, and then enters the coal mill for drying and grinding, and then is sent to the boiler furnace for incineration together with the raw coal.

[0018] Furthermore, the bottom outlet of the dissolution tank is connected to the inlet of the ball mill through the hydraulic gate, the plunger pump and the coal conveyor belt, and the mud at the bottom of the dissolution tank is transported to the coal conveyor belt through the hydraulic gate and the plunger pump.

[0019] Furthermore, a water pump is provided on the connecting pipeline, and the chloride-containing mixed liquid is transported to the heat exchange box for evaporation through the water pump.

[0020] Furthermore, it also includes a condenser, the steam outlet is connected to the steam recovery port on the condenser inlet pipe, and the evaporated gas output by the heat exchange box enters the steam recovery port for recovery.

[0021] The present invention has the following beneficial effects:

[0022] In the specific operation of the system and method for disposing garbage fly ash described in the present invention, the garbage fly ash is first stratified in the dissolution tank, and most of the chloride is dissolved in the mixed liquid in the upper layer. The mixed liquid containing chloride evaporates and crystallizes in the heat exchange box, which not only removes the chlorine element in the garbage fly ash, but also realizes the recovery of chloride industrial raw materials. The chloride content in the lower layer mud is relatively low. It is sent to the coal conveyor belt, then enters the steel ball mill for drying and grinding, and is sent to the furnace for incineration, which not only prevents the corrosion of the chlorine element to the water-cooled wall, but also decomposes the dioxin in the fly ash through the high temperature environment of the furnace, so as to realize the harmless and resource-based disposal of garbage fly ash in coal-fired power plants.

[0023] Furthermore, the bottom outlet of the dissolution tank is connected to the inlet of the ball mill through the hydraulic gate, the plunger pump and the coal conveyor belt, and the lower layer of mud is transported to the ball mill through the hydraulic gate, the plunger pump and the coal conveyor belt. In actual work, the hydraulic gate, the plunger pump and the coal conveyor belt can be used to adjust the feeding amount and feeding speed of the lower layer of mud.

[0024] Furthermore, the exhaust pipe of the intermediate pressure cylinder in the turbine is connected to the inlet pipe of the condenser, and the hot well outlet of the condenser is connected to the condensate return port. During operation, the exhaust steam from the intermediate pressure cylinder is sent to the condenser for condensation, and then sent to the condensate return port. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Among them, 1 is a transport vehicle, 2 is a dissolving tank, 3 is a hydraulic plug door, 4 is a plunger pump, 5 is a coal conveyor belt, 6 is a ball mill, 7 is a boiler furnace, 8 is a heat exchange box, 9 is a water pump, 10 is a steam outlet, 11 is a feed port, 12 is a steam turbine, 13 is a condensate return port, 14 is a steam recovery port, and 15 is a condenser. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0032] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0033] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0036] Embodiment 1

[0037] The system for treating garbage fly ash of the present invention comprises a heat exchange box 8, a dissolving tank 2, a coal conveyor belt 5, a steel ball coal mill 6 and a boiler furnace 7; a steam outlet 10 is provided at the top of the heat exchange box 8, a material taking port 11 is provided at the bottom of the heat exchange box 8, the dissolving tank 2 is connected to the heat exchange box 8 through a connecting pipe, the bottom outlet of the dissolving tank 2 is connected to the inlet of the steel ball coal mill 6 through the coal conveyor belt 5, and the outlet of the steel ball coal mill 6 is connected to the boiler furnace 7. During operation, the garbage fly ash enters the dissolving tank 2 for dissolution by adding water, and then stands still to allow the chloride-containing mixed liquid and the mud to be layered, wherein the chloride-containing mixed liquid is transported to the heat exchange box 8 for evaporation and crystallization to discharge the chlorinated industrial raw materials and remove the chlorine element in the garbage wastewater, and the mud at the bottom of the dissolving tank 2 is transported to the coal conveyor belt 5, and then enters the coal mill for drying and grinding, and then is sent to the boiler furnace 7 for incineration together with the raw coal.

[0038] Embodiment 2

[0039] refer to Figure 1 The system for disposing of garbage fly ash described in the present invention includes a heat exchange box 8, a dissolving tank 2, a coal conveyor belt 5, a steel ball mill 6 and a boiler furnace 7; a steam outlet 10 is provided at the top of the heat exchange box 8, a material taking port 11 is provided at the bottom of the heat exchange box 8, the dissolving tank 2 is connected to the heat exchange box 8 through a connecting pipe, the bottom outlet of the dissolving tank 2 is connected to the inlet of the steel ball mill 6 through the coal conveyor belt 5, and the outlet of the steel ball mill 6 is connected to the boiler furnace 7.

[0040] As an implementation mode of the present invention, a water pump 9 is provided on the connecting pipe.

[0041] As an embodiment of the present invention, the bottom outlet of the dissolution tank 2 is connected to the inlet of the ball mill 6 through the hydraulic gate 3, the plunger pump 4 and the coal conveyor belt 5. During operation, the amount and feeding speed of the lower layer of mud fed into the ball mill 6 can be controlled by the hydraulic gate 3, the plunger pump 4 and the coal conveyor belt 5.

[0042] As an embodiment of the present invention, a condenser 15 is further included, and the steam outlet 10 is connected to a steam recovery port 14 on an inlet pipe of the condenser 15 .

[0043] As an embodiment of the present invention, the intermediate pressure cylinder exhaust pipe in the steam turbine 12 is connected to the inlet pipe of the condenser 15 , and the hot well outlet of the condenser 15 is connected to the condensation return water port 13 .

[0044] As an implementation mode of the present invention, this embodiment further includes a transport vehicle 1 , which unloads the garbage fly ash into a dissolution tank 2 .

[0045] As an embodiment of the present invention, in order to accelerate the dissolution in the dissolution tank 2, the present invention is also configured with a stirring device, through which the garbage fly ash and water in the dissolution tank are stirred to quickly dissolve the garbage fly ash.

[0046] As an implementation mode of the present invention, in order to realize automatic control, this embodiment also includes a controller, which is connected to the control end of the stirring device, the control end of the water pump 9, the control end of the hydraulic gate 3, the control end of the plunger pump 4, the control end of the coal conveyor belt 5 and the control end of the ball mill 6. By controlling the water pump 9, automatic water addition is realized, by controlling the stirring device, the automatic stirring of the garbage fly ash and water in the dissolution tank 2 is realized, and by controlling the hydraulic gate 3, the plunger pump 4 and the coal conveyor belt 5, the automatic transportation of the lower layer of mud is realized, which is extremely practical.

[0047] In addition, it should be noted that the heat source of the heat exchange box 8 in the present invention can be flue gas, steam extraction from a steam turbine, hot air, etc.

[0048] At the same time, it should be noted that the present invention utilizes the dissolution tank 2 to dissolve and stratify the garbage fly ash to obtain a chloride-containing mixed liquid, and then the chloride-containing mixed liquid is sent to the heat exchange box 8 for evaporation, thereby obtaining a chloride industrial raw material to remove the chlorine element in the garbage fly ash and avoid various problems caused by direct combustion of the garbage fly ash, and the practicality is extremely strong.

[0049] Embodiment 3

[0050] The present embodiment discloses a working method of a system for disposing of garbage fly ash, wherein the system for disposing of garbage fly ash comprises a heat exchange box 8, a dissolving tank 2, a coal conveyor belt 5, a steel ball mill 6 and a boiler furnace 7; a steam outlet 10 is provided at the top of the heat exchange box 8, a material taking port 11 is provided at the bottom of the heat exchange box 8, the dissolving tank 2 is connected to the heat exchange box 8 through a connecting pipe, the bottom outlet of the dissolving tank 2 is connected to the inlet of the steel ball mill 6 via the coal conveyor belt 5, and the outlet of the steel ball mill 6 is connected to the boiler furnace 7.

[0051] The working method of the system for disposing of garbage fly ash comprises the following steps:

[0052] 1) The transport vehicle 1 unloads the garbage fly ash into the dissolution tank 2, adds water and stirs it fully to make the fly ash fully dissolved, and then allows the chloride-containing mixed liquid and the mud to be separated, and then starts the water pump 9 to transport the chloride-containing mixed liquid to the heat exchange box 8.

[0053] 2) By adjusting the evaporation rate of the heat exchange box 8, after the evaporation and crystallization are completed, the chloride industrial raw material is discharged through the material taking port 11, thereby removing the chlorine element in the garbage fly ash, and the steam generated during the evaporation process is transported to the steam recovery port 14.

[0054] 3) Start the plunger pump 4 and open the hydraulic gate 3 to transport the mud at the bottom of the dissolution tank 2 to the coal conveyor belt 5, and then send it into the coal mill for drying and grinding before being sent to the boiler furnace 7 for incineration together with the raw coal. The high temperature environment of the furnace can be used to completely remove dioxins in the fly ash. At the same time, relying on the perfect environmental protection facilities at the rear of the boiler, the waste fly ash can be harmlessly disposed of and recycled.

[0055] As an embodiment of the present invention, the bottom outlet of the dissolution tank 2 is connected to the inlet of the ball mill 6 via the hydraulic gate 3, the plunger pump 4 and the coal conveyor belt 5, and the mud at the bottom of the dissolution tank 2 is transported to the coal conveyor belt 5 via the hydraulic gate 3 and the plunger pump 4.

[0056] As an embodiment of the present invention, a water pump 9 is provided on the connecting pipeline, and the chloride-containing mixed liquid is transported to the heat exchange box 8 through the water pump 9 for evaporation.

[0057] As an embodiment of the present invention, a condenser 15 is further included, and the steam outlet 10 is connected to a steam recovery port 14 on an inlet pipe of the condenser 15 , and the evaporated gas output by the heat exchange box 8 enters the steam recovery port 14 for recovery.

[0058] As an implementation mode of the present invention, in order to realize automatic control, this embodiment also includes a controller, which is connected to the control end of the stirring device, the control end of the water pump 9, the control end of the hydraulic gate 3, the control end of the plunger pump 4, the control end of the coal conveyor belt 5 and the control end of the ball mill 6. Automatic water addition is realized by controlling the water pump 9, automatic stirring of garbage fly ash and water in the dissolution tank 2 is realized by controlling the stirring device, and automatic transportation of lower layer mud is realized by controlling the hydraulic gate 3, the plunger pump 4 and the coal conveyor belt 5. It is very practical. In addition, in actual application, the controller can send the operating data of each component to the monitoring center so that the staff can check the operating status of each device in time, and it is convenient to control each device to realize automatic control.

[0059] It should be noted that the present invention utilizes the dissolution tank 2 to dissolve and stratify the garbage fly ash to obtain a chloride-containing mixed liquid, and then the chloride-containing mixed liquid is sent to the heat exchange box 8 for evaporation, thereby obtaining a chloride industrial raw material to remove the chlorine element in the garbage fly ash, avoid corrosion of the water-cooled wall by the chlorine element, and decompose the dioxins in the fly ash through the high temperature environment of the furnace, thereby realizing the harmless and resource-based disposal of garbage fly ash in coal-fired power plants.

[0060] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0061] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A system for disposing garbage fly ash, characterized in that: It comprises a heat exchange box (8), a dissolving tank (2), a coal conveying belt (5), a steel ball coal mill (6) and a boiler furnace (7); A steam outlet (10) is provided at the top of the heat exchange box (8), a material taking port (11) is provided at the bottom of the heat exchange box (8), the dissolving tank (2) is connected to the heat exchange box (8) via a connecting pipe, the bottom outlet of the dissolving tank (2) is connected to the inlet of a steel ball mill (6) via a coal conveying belt (5), and the outlet of the steel ball mill (6) is connected to the boiler furnace (7).

2. The system for disposing garbage fly ash according to claim 1, characterized in that: A water pump (9) is provided on the connecting pipeline.

3. The system for disposing garbage fly ash according to claim 1, characterized in that: The bottom outlet of the dissolving tank (2) is connected to the inlet of the steel ball coal mill (6) via a hydraulic gate (3), a plunger pump (4) and a coal conveying belt (5).

4. The system for disposing garbage fly ash according to claim 1, characterized in that: It also includes a condenser (15), and the steam outlet (10) is connected to a steam recovery port (14) on an inlet pipe of the condenser (15).

5. The system for disposing garbage fly ash according to claim 4, characterized in that: It also includes a steam turbine (12) and a condensate return port (13), wherein the intermediate pressure cylinder exhaust pipe in the steam turbine (12) is connected to the inlet pipe of the condenser (15), and the hot well outlet of the condenser (15) is connected to the condensate return port (13).

6. The system for disposing garbage fly ash according to claim 1, characterized in that: It also includes a transport vehicle (1), which unloads the garbage fly ash into a dissolution tank (2).

7. A method for operating the system for treating fly ash according to claim 1, characterized in that: The following steps are involved: 1) unloading the garbage fly ash into a dissolution tank (2), adding water and stirring sufficiently to dissolve the fly ash, and then allowing the chloride-containing mixed liquid and the slurry to separate, and then conveying the chloride-containing mixed liquid to a heat exchange box (8) for evaporation; 2) The chloride industrial raw material is discharged through the material taking port (11) to remove the chlorine element in the garbage fly ash, and the steam generated during the evaporation process is transported to the steam recovery port (14); 3) The slurry at the bottom of the dissolving tank (2) is transported to the coal conveyor belt (5), and then enters the coal mill for drying and grinding, and then is sent together with the raw coal to the boiler furnace (7) for incineration.

8. The working method of the system for disposing garbage fly ash according to claim 7, characterized in that: The bottom outlet of the dissolving tank (2) is connected to the inlet of the steel ball coal mill (6) through the hydraulic gate (3), the plunger pump (4) and the coal conveying belt (5), and the slurry at the bottom of the dissolving tank (2) is transported to the coal conveying belt (5) through the hydraulic gate (3) and the plunger pump (4).

9. The working method of the system for disposing garbage fly ash according to claim 7, characterized in that: A water pump (9) is provided on the connecting pipeline, and the chloride-containing mixed liquid is transported to the heat exchange box (8) through the water pump (9) for evaporation.

10. The working method of the system for disposing garbage fly ash according to claim 7, characterized in that: It also includes a condenser (15), the steam outlet (10) is connected to a steam recovery port (14) on an inlet pipe of the condenser (15), and the evaporated gas output from the heat exchange box (8) enters the steam recovery port (14) for recovery.

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