Dry quenching coke powder solid waste treatment system

Abstract

The utility model discloses a dry quenching coke powder solid waste treatment system which comprises a dry quenching device, dust removal equipment is arranged in the dry quenching device, a coke powder outlet of the dust removal equipment is communicated with a hearth of a circulating fluidized bed boiler through a conveying pipeline, a blowing device is arranged on the conveying pipeline, and the blowing device is communicated with the hearth of the circulating fluidized bed boiler. And the blowing device is used for blowing the coke powder collected by the dust removal equipment into a hearth of the circulating fluidized bed boiler. According to the utility model, the dry quenching device and the circulating fluidized bed boiler are coupled together through the injection device and the pneumatic conveying pipeline, and coke powder collected by the dry quenching device is used as fuel to be fed into the circulating fluidized bed boiler for combustion, so that the resource utilization of the coke powder is realized; the possibility that the coke powder leaks to pollute the environment in the waste residue transferring process and the waste residue treatment cost are reduced, and meanwhile the coke powder serves as fuel to be combusted to generate electricity, so that extra economic benefits can be brought to enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of dry quenching coke powder solid waste treatment, in particular to a dry quenching coke powder solid waste treatment system. Background Art

[0002] The CDQ unit uses cold inert gas (typically nitrogen, at approximately 150°C) to exchange heat with hot coke (approximately 950-1050°C) in the CDQ furnace, cooling the coke to approximately 200°C. The inert gas, which absorbs the heat from the coke, then transfers it to the CDQ boiler, generating steam. The cooling of the coke produces dust known as CDQ coke fines. This fines appear grayish-black, with particles typically no larger than 3mm in diameter. They possess a certain adsorption capacity and chemical reactivity. Therefore, dust removal equipment is typically installed in the CDQ unit to remove dust.

[0003] Existing technologies capture large quantities of tiny coke fines in dust removal equipment. However, due to their small size, coke fines cannot be used in blast furnace ironmaking and are prone to environmental pollution during transportation. Furthermore, as a building material, they are inexpensive and have poor economic benefits. Therefore, to effectively utilize coke fines and reduce environmental pollution, it is necessary to comprehensively consider factors such as their properties, market demand, and environmental protection requirements, and explore more effective treatment and utilization methods. Utility Model Content

[0004] The purpose of the utility model is to provide a dry quenching coke powder solid waste treatment system to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides a dry quenching coke powder solid waste treatment system, which includes a dry quenching coke device, in which a dust removal device is provided. The coke powder outlet of the dust removal device is connected to the furnace of a circulating fluidized bed boiler through a pneumatic conveying pipe. The pneumatic conveying pipe is provided with a blowing device, which is used to blow the coke powder collected by the dust removal device into the furnace of the circulating fluidized bed boiler.

[0006] Furthermore, the dust removal equipment includes a primary dust collector and a secondary dust collector, and the dry quenching device includes a circulation pipeline and a dry quenching furnace, the primary dust collector, a waste heat boiler and the secondary dust collector arranged in sequence on the circulation pipeline.

[0007] Furthermore, the dry coke quenching device also includes a coke powder collecting device, the coke powder inlet of the coke powder collecting device is connected to the coke powder outlet of the primary dust collector and the secondary dust collector respectively, and the coke powder outlet of the coke powder collecting device is connected to the coke powder inlet of the blowing device.

[0008] Furthermore, the coke powder collection device is a ground dust removal station.

[0009] Furthermore, the blowing device is a high-pressure blower.

[0010] Furthermore, the outlet of the pneumatic conveying pipeline is communicated with the dense phase zone of the furnace of the circulating fluidized bed boiler.

[0011] The beneficial effects of the utility model are as follows: the utility model couples the dry coke quenching device and the circulating fluidized bed boiler through the blowing device and the pneumatic conveying pipeline, and the coke powder collected by the dry coke quenching device is sent to the circulating fluidized bed boiler as fuel for combustion, thereby realizing the resource utilization of the coke powder, reducing the possibility of coke powder leakage and environmental pollution during the transportation of waste slag and the cost of waste slag disposal, and burning the coke powder as fuel to generate electricity can bring additional economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0013] Among them: 1. Coke dry quenching device; 2. Circulating fluidized bed boiler; 3. Pneumatic conveying pipeline; 4. Injection device; 5. Coke powder collection device;

[0014] 11. CDQ furnace; 12. Primary dust collector; 13. Waste heat boiler; 14. Secondary dust collector. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying 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 embodiment described is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In order to make the objectives, technical solutions and advantages of this application clearer, this application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] In the following description, references to "one embodiment," "an embodiment," "an example," "an example," etc. indicate that the embodiment or example described may include certain features, structures, characteristics, properties, elements, or limitations, but not every embodiment or example necessarily includes the certain features, structures, characteristics, properties, elements, or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0018] like Figure 1As shown, the utility model discloses a coke dry quenching (CDQ) coke fines solid waste treatment system, which includes a CDQ device 1 equipped with a dust removal device. The coke fines outlet of the dust removal device is connected to the furnace of a circulating fluidized bed boiler 2 via a pneumatic conveying pipe 3. The pneumatic conveying pipe 3 is provided with a blowing device 4, which is used to blow the coke fines collected by the dust removal device into the furnace of the circulating fluidized bed boiler 2. Specifically, the outlet of the pneumatic conveying pipe 3 is connected to the furnace of the circulating fluidized bed boiler 2, and the inlet of the pneumatic conveying pipe 3 is connected to the coke fines outlet of the dust removal device.

[0019] A large amount of tiny coke powder captured by the dust removal equipment in the dry quenching device 1 during the dry quenching process enters the well-sealed pneumatic conveying pipe 3 through the coke powder outlet of the dust removal equipment. Then, the coke powder is blown into the furnace of the circulating fluidized bed through the blowing device 4 on the pneumatic conveying pipe 3 to be burned as fuel, thereby reducing the problem of dust leakage and environmental pollution during the coke powder transportation process.

[0020] At the same time, the flue gas outlet of the circulating fluidized bed boiler 2 is connected to the steam drum via a main steam pipe. The drum outlet is then connected to a steam turbine and generator via pipelines, generating electricity. In other words, the tiny coke particles produced during the dry quenching process in the coke dry quenching unit 1 can be burned as fuel to generate electricity, improving the economic efficiency of the system. Furthermore, the fine ash produced after combustion can be used as a building material, further creating value.

[0021] The utility model couples the dry coke quenching device 1 and the circulating fluidized bed boiler 2 together through the blowing device 4 and the pneumatic conveying pipe 3, and sends the coke powder collected by the dry coke quenching device 1 into the circulating fluidized bed boiler 2 as fuel for combustion, thereby realizing the resource utilization of the coke powder, reducing the possibility of coke powder leakage and environmental pollution during the transportation of waste slag and the cost of waste slag disposal, and burning the coke powder as fuel to generate electricity can bring additional economic benefits to the enterprise.

[0022] In one embodiment, the dust removal equipment includes a primary dust collector 12 and a secondary dust collector 14, and the dry quenching device 1 includes a circulation pipeline and a dry quenching furnace 11, a primary dust collector 12, a waste heat boiler 13 and a secondary dust collector 14 arranged in sequence on the circulation pipeline.

[0023] The circulating gas from the CDQ furnace 11 flows through a circulation pipeline into the primary dust collector 12 for preliminary dust removal. After this initial dust removal, it enters the waste heat boiler 13 for waste heat recovery. After cooling in the waste heat boiler 13, the circulating gas enters the secondary dust collector 14 for further dust removal. After secondary dust removal, the circulating gas re-enters the CDQ furnace 11, beginning a new cycle. The fine coke particles collected in the circulating gas from the primary and secondary dust collectors 12, 14, enter the injection device 4 through the pneumatic conveying pipe 3. The coke is then injected into the furnace of the circulating fluidized bed for combustion as fuel.

[0024] In one embodiment, the dry quenching device 1 further includes a coke powder collecting device 5 , the coke powder inlet of the coke powder collecting device 5 is connected to the coke powder outlet of the primary dust collector 12 and the secondary dust collector 14 respectively, and the coke powder outlet of the coke powder collecting device 5 is connected to the coke powder inlet of the injection device 4 .

[0025] The coke powder collected by the primary dust collector 12 and the secondary dust collector 14 are both sent to the coke powder collecting device 5 to facilitate the recovery of the coke powder. When the coke powder in the coke powder collecting device 5 accumulates to a certain amount, it is transported to the injection device 4 through the coke powder outlet.

[0026] In one embodiment, the coke dust collection device 5 is a ground dust removal station. The ground dust removal station generally uses a PLC electronic automation control system and includes a motor, fan, dust collection main pipe, bag filter or electrostatic precipitator and other dust collectors to collect and reuse the coke dust.

[0027] In one embodiment, the blowing device 4 is a high-pressure blower for blowing the coke powder in the form of a high-pressure airflow into the furnace of the circulating fluidized bed boiler 2. The high-pressure blower has a simple and compact structure, is easy to install, and is easy to maintain.

[0028] In one embodiment, the outlet of the pneumatic conveying pipe 3 is connected to the dense phase zone of the furnace of the circulating fluidized bed boiler 2. The furnace of the circulating fluidized bed boiler 2 has a dense phase zone and a dilute phase zone interconnected with each other, and the dilute phase zone is located above the dense phase zone.

[0029] The dilute phase region has a lower concentration of solid particles and fewer collisions between particles, but they still participate in the fuel combustion process, contributing to complete combustion. The dense phase region has a higher concentration of solid particles and more frequent collisions and friction between particles, making it the primary area for combustion and mass transfer. Coke fines enter the dense phase region and decompose and burn as the primary fuel, providing sufficient surface area and reaction time for efficient combustion.

[0030] The design ideas of the utility model are as follows:

[0031] In this embodiment, the CDQ device 1 includes a circulation pipeline and a CDQ furnace 11, a primary dust collector 12, a waste heat boiler 13, and a secondary dust collector 14 sequentially arranged on the circulation pipeline. The blowing device 4 is a high-pressure blower, and the coke powder collection device 5 is a ground dust removal station.

[0032] The circulating gas in the CDQ furnace 11 enters the primary dust collector 12 through a circulation pipeline for preliminary dust removal. After the initial dust removal, it enters the waste heat boiler 13 for waste heat recovery. After cooling in the waste heat boiler 13, the circulating gas enters the secondary dust collector 14 for further dust removal. After secondary dust removal, the circulating gas re-enters the CDQ furnace 11 to begin a new cycle. The tiny coke particles in the circulating gas collected by the primary dust collector 12 and the secondary dust collector 14 are collected in a ground dust collection station and then blown by the high-speed airflow of the high-pressure fan through the well-sealed pneumatic conveying pipe 3 into the dense phase zone of the circulating fluidized bed furnace as fuel for combustion, thereby processing the solid dust and coke particles and generating electricity.

[0033] The utility model couples the dry coke quenching device 1 and the circulating fluidized bed boiler 2 together through the blowing device 4 and the pneumatic conveying pipe 3, and sends the coke powder collected by the dry coke quenching device 1 into the circulating fluidized bed boiler 2 as fuel for combustion, thereby realizing the resource utilization of the coke powder, reducing the possibility of coke powder leakage and environmental pollution during the transportation of waste slag and the cost of waste slag disposal, and burning the coke powder as fuel to generate electricity can bring additional economic benefits to the enterprise.

[0034] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dry quenching coke fines solid waste treatment system, comprising a dry quenching device equipped with a dust removal device, characterized in that: The coke powder outlet of the dust removal equipment is connected to the furnace of the circulating fluidized bed boiler through a pneumatic conveying pipe. The pneumatic conveying pipe is provided with a blowing device, which is used to blow the coke powder collected by the dust removal equipment into the furnace of the circulating fluidized bed boiler.

2. The CDQ coke powder solid waste treatment system according to claim 1, characterized in that: The dust removal equipment includes a primary dust collector and a secondary dust collector, and the dry quenching device includes a circulation pipeline and a dry quenching furnace, the primary dust collector, a waste heat boiler and the secondary dust collector which are sequentially arranged on the circulation pipeline.

3. The CDQ coke powder solid waste treatment system according to claim 2, characterized in that: The dry coke quenching device further includes a coke powder collecting device, the coke powder inlet of the coke powder collecting device is connected to the coke powder outlet of the primary dust collector and the secondary dust collector respectively, and the coke powder outlet of the coke powder collecting device is connected to the coke powder inlet of the blowing device.

4. The CDQ coke fines solid waste treatment system according to claim 3, characterized in that: The coke powder collection device is a ground dust removal station.

5. The CDQ coke fines solid waste treatment system according to claim 1, characterized in that: The blowing device is a high-pressure blower.

6. The CDQ coke powder solid waste treatment system according to claim 1, characterized in that: The outlet of the pneumatic conveying pipeline is communicated with the dense phase zone of the furnace of the circulating fluidized bed boiler.

Images