Pulverized coal low-nitrogen direct combustion type gas ash residue drying and grading system

Abstract

The utility model discloses a pulverized coal low-nitrogen direct combustion type gas ash residue drying and grading system, and relates to the technical field of gas ash residue drying. Comprising the steps that a gas ash and slag feeding system conveys gas ash and slag raw materials of a raw material workshop, the discharging end of the gas ash and slag feeding system is connected with the feeding end of a flash drying system, the gas ash and slag raw materials are dried through the flash drying system, and coal briquettes are crushed and conveyed through a pulverized coal feeding system; the feeding end of the combustion system is connected with the discharging end of the pulverized coal feeding system, and the combustion system combusts pulverized coal conveyed by the pulverized coal feeding system. The discharging end of the combustion system is connected with the feeding end of the flash drying system, high-hot air generated by combusting pulverized coal through the combustion system is conveyed to the flash drying system to provide heat for drying of the flash drying system, the feeding end of the pneumatic conveying system is connected with the discharging end of the flash drying system to convey dried materials, and the discharging end of the pneumatic conveying system is connected with the discharging end of the flash drying system. The discharging end of the pneumatic conveying system is connected with the warehousing system, and the warehousing system stores materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas ash drying technical field, concretely relates to a coal powder low nitrogen direct combustion formula gas ash drying grading system. BACKGROUND

[0002] Generally speaking, the derivatives of products in the production process of various chemical plants and the solid wastes generated in each process mostly have high water content, which brings great inconvenience and economic waste to storage, transportation and recycling. Therefore, a large number of process technologies for drying and treating such "solid waste" have emerged.

[0003] Due to the high calorific value and high stability of gas ash, its economic benefit is high, and it is a high-value "solid waste", so the process technology of gas ash drying has gradually become popular in recent years. The gas ash drying process refers to a series of technologies and methods for drying the waste ash generated in the coal gasification process. The purpose of these processes is to reduce the moisture content of the gasification slag, increase its calorific value, so that it can be further utilized, such as reused as fuel or used to manufacture building materials, etc.

[0004] However, the existing process technology has many shortcomings as follows:

[0005] The price of heat source is high and the selection is not scientific. Most of the existing process technologies select natural gas, coal gas and the like with high calorific value, high cleanliness and high price, without considering the regional nature of energy.

[0006] The drying efficiency is low and the heat energy is seriously wasted.

[0007] The product recovery system equipment has high failure rate, the system operation is interrupted frequently, and the recovery efficiency is low.

[0008] The products are not graded, the particle sizes are mixed, and the economic benefits are not fully realized.

[0009] In some processes using coal and coal gas as energy, nitrogen oxides in tail gas are extremely unstable and often fail to meet environmental protection standards. UTILITY MODEL CONTENT

[0010] Therefore, the utility model embodiment provides a coal powder low nitrogen direct combustion formula gas ash drying grading system to solve the above technical problems.

[0011] In order to achieve the above purpose, the utility model embodiment provides the following technical scheme:

[0012] A coal powder low nitrogen direct combustion formula gas ash drying grading system comprises:

[0013] A gas ash feeding system, which transports the gas ash raw materials of the raw material workshop;

[0014] The flash drying system is connected with the feeding end of the gas ash residue feeding system, and the raw material of the gas ash residue is dried through the flash drying system.

[0015] The pulverized coal feeding system is connected with the feeding end of the coal block conveying source, and the pulverized coal feeding system is used for crushing and conveying the coal block.

[0016] The combustion system is connected with the feeding end of the pulverized coal feeding system, and the combustion system is used for burning the pulverized coal conveyed by the pulverized coal feeding system; the combustion system is connected with the feeding end of the flash drying system, and the high-temperature air generated by the combustion system is conveyed to the flash drying system to provide heat for the drying of the flash drying system.

[0017] The pneumatic conveying system is connected with the feeding end of the flash drying system, and the material after drying is conveyed through the pneumatic conveying system.

[0018] The storage system is connected with the feeding end of the pneumatic conveying system, and the material is stored through the storage system.

[0019] Optionally, the gas ash residue feeding system comprises a buffer bin, the feeding port of the buffer bin is connected to the raw material workshop, a metering belt is arranged below the discharging port of the buffer bin, a belt conveyor is arranged in the conveying direction of the metering belt, one side of the feeding direction of the belt conveyor is connected to a feeding machine, and the feeding machine is connected to the flash drying system.

[0020] Optionally, the pulverized coal feeding system comprises a vibrating bin, the vibrating bin is connected to the coal block conveying source, a coal block crusher is arranged below the discharging port of the vibrating bin, a screw conveyor is arranged below the discharging port of the coal block crusher, a coal mill is arranged below the discharging port of the screw conveyor, and the discharging port of the coal mill is connected to the combustion system through a pneumatic conveying pipeline.

[0021] Optionally, the combustion system comprises a pulverized coal burner and a combustion chamber, the pulverized coal burner is arranged in the combustion chamber, the feeding end of the pulverized coal burner is connected to the discharging end of the pneumatic conveying pipeline of the coal mill, the pulverized coal burner is further connected to a burner fan, one side of the combustion chamber is connected to a blast fan, and the discharging end of the combustion chamber is connected to the flash drying system.

[0022] Optionally, the flash drying system comprises a dryer, the hot air port of the dryer is connected to the air outlet of the combustion chamber, and the feeding end of the dryer is connected to the discharging end of the feeding machine.

[0023] Optionally, the pneumatic conveying system comprises two pneumatic conveying lines.

[0024] One is a cyclone conveying line system, and the other is a pulse bag recovery conveying line system; the two pneumatic conveying lines are respectively connected to one storage system.

[0025] Optionally, the pulse cloth bag recycling conveying line system is connected with the desulfurization tower through an air blower.

[0026] The utility model has at least the following beneficial effects:

[0027] The utility model discloses a coal block is used as independent heat source by coal powder feeding system of combustion system, and the combustion system is low in nitrogen content, and the gas ash residue that is transported to the flash drying system by the gas ash residue feeding system is dried by using heat, then is classified through the pneumatic conveying system, selects the required material particle size, and the coal block is the heat source, and the economic rationality of energy is high, and the environment friendliness of tail gas desulfurization plant area is high by using low nitrogen content combustion, and product particle size is classified and stored, and the economic benefit of product is high. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the prior art and the utility model, the following will be briefly introduced the drawings needed to be used in the prior art and the utility model embodiment description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived according to the provided drawings without creative labor.

[0029] The structure, proportion, size and the like shown in the specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions of the utility model that can be implemented, and any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the utility model can produce, should still fall within the range that the technical content disclosed by the utility model can cover.

[0030] Figure 1 It is a schematic view of the principle structure of an embodiment of the utility model;

[0031] Figure 2 It is a schematic view of the principle structure of an embodiment of the utility model; Figure 1 It is a schematic view of the principle structure of an embodiment of the utility model;

[0032] Figure 3 It is a schematic view of the principle structure of an embodiment of the utility model; Figure 1 It is a schematic view of the principle structure of an embodiment of the utility model;

[0033] Explanation of reference signs:

[0034] 1. Coal lumps crusher; 2. Vibrating silo; 3. Screw conveyor; 4. Coal mill; 5. Burner oil supply pump; 6. Burner fan; 7. Pulverized coal burner; 8. Air distribution fan; 9. Combustion chamber; 10. Buffer silo; 11. Metering belt; 12. Belt conveyor; 13. Feeder; 14. Dryer; 15. Pneumatic conveying system; 16. Cyclone recoverer; 17. Cyclone silo; 18. Low-pressure pulse bag recoverer; 19. Ton bag machine; 20. Bag silo; 21. Exhaust fan; 22. Desulfurization tower. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," "fourth," etc. (if present), in the specification, claims, and accompanying drawings of this utility model are intended to distinguish the objects they refer to. For solutions with a sequential flow, this terminology need not be interpreted as describing a specific order or sequence; for solutions with device structures, this terminology does not distinguish between matters of importance or positional relationships.

[0037] Furthermore, the terms “comprising,” “having,” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may also include other steps or units that are not expressly listed but are inherent to these processes, methods, products, or devices, or steps or units added based on further optimizations of the inventive concept.

[0038] like Figures 1-3 As shown, this utility model discloses a low-NOx direct-fired coal ash drying and grading system, comprising:

[0039] The AF (air-ash) and slag feeding system transports AF raw materials from the raw material workshop.

[0040] A buffer silo 10 is placed in the feeding yard, and a high-precision metering belt 11 is installed at the discharge end to ensure the constant speed and quantity of raw material delivery. At the same time, it is controlled by a remote automated control system to realize dynamic regulation of materials and energy. Then it enters the belt conveyor 12 and is conveyed to the screw feeder 13. After being conveyed by the feeder 13, the raw material that has been clumped due to moisture is initially broken up and finally conveyed to the flash dryer 14.

[0041] The discharge end of the flash drying system and the gas ash residue feeding system is connected to the feeding end of the flash drying system, and the flash drying system is used to dry the gas ash residue raw material;

[0042] The material is delivered to the dry main machine by the screw feeder, and is crushed and pulverized by the crushing device of the dry machine 14 in the crushing section, and is fully mixed with high-temperature hot air with the same rotation direction, and then enters the drying section of the dry machine 14, and the drying is completed instantaneously. The dried material is separated by the cyclone separator and the pulse bag collector of the drying system, and the separated material is delivered to the silo by the pneumatic conveying system 15, and the final tail gas is discharged into the atmosphere;

[0043] The flash dryer 14 is a device with a dispersing and stirring function, which can complete the drying process instantaneously under the joint action of mechanical force and hot flue gas. The heat source for drying is an independent heat source, which is completely burned in an independent high-temperature combustion chamber 9, and then adjusted by primary and secondary air according to process requirements to reach the drying temperature and then enter the dry machine 14 for drying.

[0044] The coal powder feeding system crushes and delivers the coal blocks;

[0045] A vibrating coal bunker is placed in the coal yard, and a coal block crusher 1 is arranged at the discharge end to crush the coal blocks with a particle size of 30-80 mm into small particles below 8 mm. Then the small particles of coal are further ground to below 180 mesh by a high-precision metering screw and then pneumatically conveyed to a coal grinding and powdering machine for use in a coal powder combustion machine.

[0046] The combustion system is connected to the discharge end of the coal powder feeding system, and the combustion system is connected to the feeding end of the flash drying system. The high-temperature air generated by the combustion of the coal powder in the combustion system is delivered to the flash drying system to provide heat for the drying of the flash drying system;

[0047] The combustion system mainly includes a coal powder hot air furnace, a coal powder burner 7, an air distribution fan 8, and a temperature and pressure sensing element. The coal powder (below 180 mesh) is used as energy and is burned in the coal powder hot air furnace. The high-temperature air formed by the burning is distributed by the remote automatic control system, and the temperature is dynamically adjusted to supply the rear-end flash dryer 14 system. At the same time, sufficient air is supplied to achieve the condition of low-nitrogen combustion;

[0048] At the same time, the coal powder burner 7 is connected to a burner oil pump 5.

[0049] The pneumatic conveying system 15 is connected to the discharge end of the flash drying system, and the pneumatic conveying system 15 is connected to the feeding end of the flash drying system.

[0050] The warehouse system is connected with the discharge end of the pneumatic conveying system 15, and the warehouse system stores the materials.

[0051] The gas ash feeding system comprises a buffer bin 10, a feed inlet of the buffer bin 10 is connected to a raw material workshop, a discharge outlet of the buffer bin 10 is provided below a metering belt 11, a conveying direction of the metering belt 11 is provided with a belt conveyor 12, a feeding direction side of the belt conveyor 12 is connected to a feeder 13, and the feeder 13 is connected to a flash drying system.

[0052] The pulverized coal feeding system comprises a vibrating bin 2, the vibrating bin 2 is connected to a coal block conveying source, a coal block crusher 1 is arranged below a discharge outlet of the vibrating bin 2, a spiral conveyor 3 is arranged below a discharge outlet of the coal block crusher 1, a coal mill 4 is arranged below a discharge outlet of the spiral conveyor 3, and a discharge outlet of the coal mill 4 is connected to a combustion system through a pneumatic conveying pipeline.

[0053] The combustion system comprises a pulverized coal burner 7 and a combustion chamber 9, the pulverized coal burner 7 is arranged in the combustion chamber 9, a feed end of the pulverized coal burner 7 is connected to a discharge end of the pneumatic conveying pipeline of the coal mill 4, the pulverized coal burner 7 is further connected to a burner fan 6, one side of the combustion chamber 9 is connected to a distribution fan 8, and a discharge end of the combustion chamber 9 is connected to the flash drying system.

[0054] The flash drying system comprises a dryer 14, a hot air inlet of the dryer 14 is connected to an air outlet of the combustion chamber 9, and a feed end of the dryer 14 is connected to a discharge end of the feeder 13.

[0055] The pneumatic conveying system 15 comprises two pneumatic conveying lines;

[0056] One is a cyclone conveying line system, and the other is a pulse bag recovery conveying line system, and the two pneumatic conveying lines are respectively connected to one warehouse system.

[0057] The cyclone conveying line system is: a cyclone bin 17, and the pneumatic conveying system 15 is connected to the cyclone bin 17 through a cyclone recovery device 16.

[0058] The pulse bag recovery conveying line system is: the pneumatic conveying system 15 is connected to a bag bin 20 through a low-pressure pulse bag recovery device 18, and then the bag bin 20 is connected to a ton bag machine 19.

[0059] The project is to ensure product particle size grading warehouse, set up two pneumatic conveying line. Cyclone conveying line system adopts the way of positive pressure dilute phase pneumatic conveying, first material through cyclone hopper into the rotary feeder, through the rotary feeder evenly sent to the conveying pipeline, then through the Roots blower generated by the positive pressure air evenly sent to the end of the material storage warehouse; conveying system of the end of the storage warehouse is provided with pulse bag dust collector, material through the way of gravity feeding into the silo, conveying gas through pulse bag dust collector filter into the atmosphere, complete the material conveying.

[0060] Pulse bag recovery conveyor system adopts the way of negative pressure dilute phase pneumatic conveying, first material through the pulse bag recovery hopper into the rotary feeder, through the rotary feeder evenly sent to the conveying pipeline, then through the Roots vacuum pump generated by the negative pressure air evenly sent to the end of the combined dust collector; material gas separation through the dust collector, conveying gas through pulse bag dust collector filter into the vacuum pump empty; combined dust collector hopper interface rotary unloader, material through the rotary unloader into the end of the tank.

[0061] Because of the different particle size of the product, its use and value are quite different, the project adopts product particle size grading warehouse, to maximize the realization of the economic benefits of the product. The specific implementation is two board warehouse, three kinds of discharge mode (i.e. ton bag, tank car, board car), and achieve real-time monitoring of video, remote automatic control system control and on-site manual control switching.

[0062] The whole pneumatic conveying control system as a control unit, system configuration PLC automatic control system, realize the automatic control operation of the system.

[0063] Pulse bag recovery conveying line system through the induced draft fan 21 connection desulfurization tower 22.

[0064] The mature double alkali desulfurization process is adopted. The desulfurization system adopts positive pressure operation. The process mainly includes: flue gas system, slurry preparation system, SO2 absorption tower system, absorption tower discharge and process water system, electrical system and automatic control system, etc.

[0065] From the outlet of the drying system after the flue gas through the induced draft fan 21 into the flue, into the desulfurization tower 22 system. After desulfurization tower 22 desulfurization purification, by demister to remove water mist, by the chimney to the atmosphere.

[0066] The above several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0067] Any combination of the technical features in the above embodiments can be made (as long as the combination of the technical features does not exist contradiction), in order to make the description simple, not all possible combinations of each technical feature in the above embodiments are described; these embodiments which are not explicitly written should also be considered as the scope of the description.

[0068] The utility model is described in detail above through general description and specific embodiments. It should be pointed out that, without departing from the concept of the utility model, obviously, a number of deformations and improvements can be made to these specific embodiments, and these all belong to the protection scope of the application. Therefore, the protection scope of the patent application should be subject to the appended claims.

Claims

1. A pulverized coal low-nitrogen direct combustion ash drying and classifying system, characterized in that, The application relates to a coal powder production system. The coal powder production system comprises a gas ash slag feeding system, a flash drying system, a coal powder feeding system, a combustion system, a pneumatic conveying system and a storage system. The gas ash slag feeding system is used for conveying gas ash slag raw materials from a raw material workshop. The flash drying system is connected with the gas ash slag feeding system and is used for drying the gas ash slag raw materials. The coal powder feeding system is used for crushing and conveying coal blocks. The combustion system is connected with the coal powder feeding system and is used for burning the coal powder. The combustion system is connected with the flash drying system and is used for conveying high-temperature air generated by burning the coal powder to the flash drying system to provide heat for drying.

2. The coal dust low-nitrogen direct combustion ash drying and grading system according to claim 1, characterized in that: The pneumatic conveying system is connected with the flash drying system and is used for conveying the dried materials.

3. The coal dust low-nitrogen direct combustion ash drying and grading system according to claim 1, characterized in that: The storage system is connected with the pneumatic conveying system and is used for storing the materials.

4. The coal dust low-nitrogen direct combustion ash drying and grading system according to claim 3, characterized in that: The gas ash slag feeding system comprises a buffer bin, a metering belt arranged below a discharge port of the buffer bin, a belt conveyor arranged in a conveying direction of the metering belt, a feeder connected with one side of the belt conveyor in a feeding direction, and the feeder is connected with the flash drying system.

5. The coal dust low-nitrogen direct combustion ash drying and grading system according to claim 1, characterized in that: The coal powder feeding system comprises a vibrating bin, a coal block conveying source, a coal block crusher arranged below a discharge port of the vibrating bin, a screw conveyor arranged below a discharge port of the coal block crusher, a coal mill arranged below a discharge port of the screw conveyor, and a wind conveying pipeline connected with the combustion system.

6. The coal dust low-nitrogen direct combustion ash drying and grading system according to claim 1, characterized in that: The combustion system comprises a coal powder burner and a combustion chamber, the coal powder burner is arranged in the combustion chamber, a feeding end of the coal powder burner is connected with a discharge end of the wind conveying pipeline of the coal mill, the coal powder burner is further connected with a burner fan, a wind distribution fan is arranged on one side of the combustion chamber, and a discharge end of the combustion chamber is connected with the flash drying system. The flash drying system comprises a dryer, a hot air inlet of the dryer is connected with an air outlet of the combustion chamber, and a feeding end of the dryer is connected with a discharge end of the feeder.

7. The coal dust low-nitrogen direct combustion ash drying and grading system according to claim 6, characterized in that: The pneumatic conveying system comprises two pneumatic conveying lines. One is a cyclone conveying line system, and the other is a pulse cloth bag recovery conveying line system. The pulse cloth bag recovery conveying line system is connected with a desulfurization tower through an air induction fan.

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