Coking furnace tail gas clean combustion utilization system

Abstract

The application provides a coking furnace tail gas clean combustion utilization system. The coking furnace tail gas clean combustion utilization system comprises, in sequence, a combustor, a heating device, a drying device and a dust collecting device, wherein the air inlet end of the combustor is connected with a tail gas valve group and a blower of a coking furnace; and the combustor is a pre-combustion chamber type coal powder cyclone combustor. Through the combustor, the heating device, the drying device and the dust collecting device connected in sequence, the VOCs tail gas of the coking plant can be efficiently and cleanly utilized.

Description

Technical Field

[0001] This application relates to the field of coking tail gas treatment technology, and in particular to a clean combustion and utilization system for coking furnace tail gas. Background Technology

[0002] In the coal chemical coking process, due to changes in media flow, temperature, and pressure, exhaust gases containing VOCs (Volatile Organic Compounds) are easily released. These exhaust gases have complex compositions, containing various irritating, corrosive, malodorous, and even carcinogenic and teratogenic components, and are a major source of odor in coking plants. The emission of exhaust gases not only seriously pollutes the environment and harms human health, and exacerbates equipment corrosion, but also wastes resources. Improper handling can also pose safety risks of combustion and explosion.

[0003] Currently, common methods for treating VOCs exhaust gas from coking plants include chemical absorption, physical adsorption, condensation recovery, combustion, catalytic decomposition, nitrogen sealing, and recovery via a negative pressure gas pipeline network through a pressure balancing system. Among these, combustion has certain advantages due to its ability to overcome limitations in safety, investment costs, and operating expenses. However, existing combustion methods for treating VOCs exhaust gas in coking plants suffer from problems such as inefficient utilization of the exhaust gases and incomplete combustion, potentially leaving residual pollutants in the emissions. Summary of the Invention

[0004] This application provides a clean combustion and utilization system for coking furnace exhaust gas, thereby addressing at least one problem in the related technologies. The technical solution of this application is as follows:

[0005] This application provides a clean combustion and utilization system for coking furnace tail gas, including a burner, a heating device, a drying device, and a dust collection device connected in sequence. The inlet end of the burner is connected to the tail gas valve group and the blower of the coking furnace. The burner is a pre-combustion chamber type pulverized coal swirl burner.

[0006] In some implementations, the pre-combustion chamber type pulverized coal cyclone burner includes a conical pre-combustion chamber front cavity and a cylindrical pre-combustion chamber. The pre-combustion chamber front cavity is located on one side of the pre-combustion chamber, and the large end of the pre-combustion chamber front cavity is connected to the pre-combustion chamber. The other side of the pre-combustion chamber is provided with a pre-combustion chamber outlet.

[0007] The small opening of the pre-combustion chamber front cavity is provided with a primary air duct and a secondary air duct. The secondary air duct is located on the outer periphery of the primary air duct, and the inlet of the pre-combustion chamber front cavity is provided with a conical inlet end cap for guiding the restricted swirling secondary air towards the side wall of the pre-combustion chamber.

[0008] The top of the pre-combustion chamber is provided with a tertiary air inlet, the primary air duct is connected to the exhaust gas valve group, and the secondary air duct is connected to the blower.

[0009] In some implementations, axial blades are provided inside the secondary air duct.

[0010] In some implementations, a feed inlet is provided on the pipe between the inlet of the secondary air duct and the blower, and the feed inlet is connected to the pulverized coal storage bin via a screw weigher.

[0011] In some implementations, a feed inlet is provided on the pipe between the inlet of the secondary air duct and the blower, and the feed inlet is connected to the oil residue storage bin via a screw weigher.

[0012] In some implementations, the heating device is a hot air furnace.

[0013] In some implementations, the drying device is a rotary kiln.

[0014] In some implementations, the dust collection device is a baghouse dust collector.

[0015] The technical solution provided in this application has at least the following beneficial effects:

[0016] The VOCs exhaust gas from coking plants can be efficiently and cleanly utilized through a burner, heating device, drying device, and dust collection device connected in sequence; and the burner of this application makes combustion more complete, further ensuring that there are no residual pollutants in the final exhaust gas.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0019] Figure 1 This is a block diagram illustrating a clean combustion and utilization system for coking furnace exhaust gas according to an exemplary embodiment.

[0020] Figure 2 This is a schematic diagram of the structure of a pre-combustion chamber type pulverized coal swirl burner according to an exemplary embodiment.

[0021] Figure 3 This is a block diagram illustrating a clean combustion and utilization system for coking furnace exhaust gas according to another exemplary embodiment.

[0022] Figure 4 This is a block diagram illustrating a clean combustion and utilization system for coking furnace exhaust gas according to yet another exemplary embodiment.

[0023] In the picture:

[0024] 1- Primary air duct, 2- Secondary air duct, 3- Axial blade, 4- Pre-combustion chamber front cavity, 5- Tertiary air inlet, 6- Pre-combustion chamber, 7- Pre-combustion chamber outlet, 8- Conical inlet end cap. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0027] Figure 1 This is a block diagram of a coking furnace exhaust gas clean combustion and utilization system according to an embodiment of this application, such as... Figure 1 As shown, the coking furnace exhaust gas clean combustion and utilization system includes a burner, a heating device, a drying device, and a dust collection device connected in sequence. The air inlet end of the burner is connected to the exhaust gas valve group and the blower of the coking furnace.

[0028] The burner's inlet is connected to the coking furnace's tail gas valve group and a blower. The tail gas valve group controls the entry of VOCs-laden gas from the coking plant into the burner, while air enters through the blower. The burner uses combustion to treat the mixture of VOCs-laden gas and air, converting the VOCs into harmless substances under high-temperature combustion. The heating device further heats the gas discharged from the burner to the required temperature for use in the drying device. The exhaust gas after combustion is used to dry materials, achieving better and more rational utilization of the VOCs-laden gas. The flue gas discharged from the drying device is treated by a dust collection device, and the final clean flue gas can be directly discharged into the atmosphere.

[0029] The burner is a pre-combustion chamber type pulverized coal swirl burner. The pre-combustion chamber type pulverized coal swirl burner forms a high-temperature zone inside. When the fuel passes through this high-temperature zone, it is rapidly heated, which is conducive to fuel combustion. The use of a pre-combustion chamber type pulverized coal swirl burner here is more conducive to the combustion and conversion of VOCs exhaust gas.

[0030] Preferably, the heating device is a hot air furnace, and the burner is directly connected to the hot air furnace. The hot air furnace has a good heating effect and facilitates obtaining the gas that meets the temperature requirements of the drying device.

[0031] Preferably, the drying device is a rotary kiln, and the hot flue gas obtained after heating by the heating device directly enters the rotary kiln to dry the material in the rotary kiln.

[0032] Preferably, the dust collection device is a bag filter dust collector, which has good dust removal effect and good heat resistance.

[0033] The coking furnace tail gas clean combustion utilization system provided in this application embodiment directly heats the flue gas after combustion in the burner through a hot air furnace and then uses it to dry materials in a drying device. In conjunction with a dust collection device, dust is collected to finally obtain clean flue gas that can be directly discharged into the atmosphere, thus achieving efficient and clean utilization of VOCs tail gas from coking plants.

[0034] To improve the combustion efficiency of the pre-combustion chamber pulverized coal swirl burner, improvements were made to the aforementioned pre-combustion chamber pulverized coal swirl burner, such as... Figure 2 As shown, the pre-combustion chamber type pulverized coal cyclone burner includes a conical pre-combustion chamber front cavity 4 and a cylindrical pre-combustion chamber 6. The pre-combustion chamber front cavity 4 is located on one side of the pre-combustion chamber 6, and the large conical end of the pre-combustion chamber front cavity 4 is connected to the pre-combustion chamber 6. The other side of the pre-combustion chamber 6 is provided with a pre-combustion chamber outlet 7.

[0035] The conical opening of the pre-combustion chamber front cavity 4 is provided with a primary air duct 1 and a secondary air duct 2. The secondary air duct 2 is located on the outer periphery of the primary air duct 1, and a conical inlet end cap 8 is provided at the inlet of the pre-combustion chamber front cavity 4 to guide the restricted swirling secondary air towards the side wall of the pre-combustion chamber front cavity 4. The conical inlet end cap 8 has an annular structure.

[0036] The top of the pre-combustion chamber 6 is provided with a tertiary air inlet 5. The primary air duct 1 is connected to the tail gas valve group, and the secondary air duct 2 is connected to the blower. The mixture of VOCs tail gas and air from the coking plant enters the pre-combustion chamber front chamber 4 through the primary air duct 1. The secondary air enters the conical pre-combustion chamber front chamber 4 through the secondary air duct 2. The tertiary air enters the cylindrical pre-combustion chamber 6 through the tertiary air inlet 5. The hot flue gas generated after combustion is injected into the furnace of the hot blast stove through the pre-combustion chamber outlet 7.

[0037] The pre-combustion chamber pulverized coal cyclone burner of this embodiment employs radial grading and cyclone enhancement measures to ensure ultra-low pollutant emissions while achieving stable fuel combustion. Its design concept is as follows: the presence of a conical inlet end cap at the inlet of the pre-combustion chamber directs the restricted cyclone secondary air towards the cylindrical sidewall of the pre-combustion chamber, thus forming a large recirculation zone in the center of the pre-combustion chamber. Simultaneously, by rationally controlling the primary air volume and the injection speed of the primary air-pulverized coal mixture (referred to as primary air-pulverized coal), the residence time of the pulverized coal during the heating and ignition stage in the pre-combustion chamber is ensured. Furthermore, a large amount of high-temperature flue gas generated during combustion in the pre-combustion chamber flows back towards the root of the primary air-pulverized coal mixture due to the cyclone and pre-combustion chamber structure, allowing the primary air-pulverized coal to directly enter the core area of ​​the recirculation zone and mix with the high-temperature flue gas. This significantly enhances the ignition stability of the pulverized coal, resulting in more complete combustion of the exhaust gas and further ensuring that there are no residual pollutants in the final emission gas.

[0038] Furthermore, the secondary air duct 2 is provided with axial blades 3. Secondary air enters through the secondary air duct 2, passes through the axial blades 3, and enters the conical pre-combustion chamber front cavity 4. The axial blades 3 can increase the amount of secondary air entering.

[0039] Figure 3 This is a block diagram of a coking furnace exhaust gas clean combustion and utilization system according to another embodiment of this application, such as... Figure 3 As shown, in Figure 1 Based on the coking furnace tail gas clean combustion and utilization system shown, the air inlet end of the burner of the coking furnace tail gas clean combustion and utilization system in this embodiment is also connected to a pulverized coal storage silo.

[0040] As one possible implementation, a feed inlet is provided on the pipe between the inlet of the secondary air duct of the pre-combustion chamber pulverized coal cyclone burner and the blower, and the feed inlet is connected to the pulverized coal storage bin through a screw scale.

[0041] The pulverized coal is transported to the air intake pipe leading to the pre-combustion chamber pulverized coal swirl burner by a screw scale, and the pulverized coal is blown into the pre-combustion chamber pulverized coal swirl burner by a blower.

[0042] The coking furnace exhaust gas clean combustion and utilization system of this embodiment further utilizes the pulverized coal in the pulverized coal storage silo of the coking plant, uses the coking furnace exhaust gas as fuel and couples it with pulverized coal fuel, and uses it for clean and efficient hot blast stoves and drying equipment, so as to achieve clean, efficient and low-cost utilization of coking furnace exhaust gas.

[0043] Figure 4 This is a block diagram of a coking furnace exhaust gas clean combustion and utilization system according to another embodiment of this application, such as... Figure 4 As shown, in Figure 1Based on the coking furnace tail gas clean combustion and utilization system shown, the air inlet end of the burner of the coking furnace tail gas clean combustion and utilization system in this embodiment is also connected to a pulverized coal storage silo.

[0044] As one possible implementation, a feed inlet is provided on the pipe between the inlet of the secondary air duct of the pre-combustion chamber pulverized coal cyclone burner and the blower, and the feed inlet is connected to the oil residue storage bin through a screw scale.

[0045] The oil residue is transported to the air intake pipe leading to the pre-combustion chamber pulverized coal cyclone burner by a screw scale, and then blown into the pre-combustion chamber pulverized coal cyclone burner by a blower.

[0046] The coking furnace exhaust gas clean combustion and utilization system of this embodiment further utilizes the oil residue in the coking plant's oil residue storage silo, uses the coking furnace exhaust gas as fuel and couples it with oil residue fuel, and uses it for clean and efficient hot blast stoves and drying equipment, so as to achieve clean, efficient and low-cost utilization of coking furnace exhaust gas.

[0047] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0048] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0049] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A clean combustion and utilization system for coking furnace exhaust gas, characterized in that, It includes a burner, a heating device, a drying device, and a dust collection device connected in sequence, wherein the air inlet end of the burner is connected to the tail gas valve group and the blower of the coking furnace; the burner is a pre-combustion chamber type pulverized coal cyclone burner; The pre-combustion chamber type pulverized coal cyclone burner includes a conical pre-combustion chamber front cavity and a cylindrical pre-combustion chamber. The pre-combustion chamber front cavity is located on one side of the pre-combustion chamber, and the large end of the pre-combustion chamber front cavity is connected to the pre-combustion chamber. The other side of the pre-combustion chamber is provided with a pre-combustion chamber outlet. The front cavity of the pre-combustion chamber is provided with a primary air duct and a secondary air duct at its small opening. The secondary air duct is located on the outer periphery of the primary air duct, and the inlet of the front cavity of the pre-combustion chamber is provided with a conical inlet end cap for guiding the restricted swirling secondary air towards the side wall of the pre-combustion chamber. A feed inlet is provided on the pipe between the inlet of the secondary air duct and the blower. The feed inlet is connected to a pulverized coal storage bin or an oil residue storage bin via a screw weigher. The top of the pre-combustion chamber is provided with a tertiary air inlet, the primary air duct is connected to the exhaust gas valve group, and the secondary air duct is connected to the blower.

2. The coking furnace tail gas clean combustion and utilization system according to claim 1, characterized in that, The secondary air duct is equipped with axial blades.

3. The coking furnace tail gas clean combustion and utilization system according to claim 1, characterized in that, The heating device is a hot air furnace.

4. The coking furnace tail gas clean combustion and utilization system according to claim 1, characterized in that, The drying device is a rotary kiln.

5. The coking furnace tail gas clean combustion and utilization system according to claim 1, characterized in that, The dust collection device is a baghouse dust collector.

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