Bypass ventilation system for replacing crude fuel VOCS waste gas in environment-friendly workshop by adopting co-processing

Abstract

The utility model relates to a bypass ventilation system for replacing raw fuel environment-friendly workshop VOCS waste gas through co-processing, which comprises a waste gas collecting system connected with a raw fuel environment-friendly workshop, and the waste gas collecting system is respectively connected with a primary cooling source VOCs waste gas air supply system and a secondary cooling source VOCs waste gas air supply system. The primary cooling source VOCs waste gas air supply system is sequentially connected with a cyclone separator, a bag type dust collector, a bypass system fan, a mixing chamber, a kiln head air supply system, a kiln head grate cooler, a rotary kiln, a kiln tail smoke chamber, a cement kiln denitration and desulfurization system, a kiln tail dust collection system and a chimney, and the kiln tail smoke chamber is connected with the cyclone separator; and the secondary cooling source VOCs waste gas air supply system is connected with the mixing chamber. Harmful elements in a cement kiln system are reduced, the skinning risk of the preheater is relieved, co-processing of VOCs waste gas is achieved, coarse and fine separation of bypass ash is completed, the discharge pressure of a cement enterprise is relieved, and the operation cost of the cement enterprise is saved.

Description

Technical Field

[0001] The utility model relates to the field of cement kiln coordinated disposal of alternative raw fuels, and more specifically, to a bypass venting system for VOCS waste gas in an environmental protection workshop that adopts coordinated disposal of alternative raw fuels. Background Art

[0002] The coordinated disposal of alternative raw materials in cement kilns is an important development direction for the cement industry. In the process of storing alternative raw materials, some alternative fuels will bring about problems such as unorganized emissions of VOCs, causing environmental pollution. Therefore, waste gas collection and treatment are required when handling such alternative raw materials. In order to save the operating costs of waste gas treatment, this waste gas is generally collected and sent to the kiln head grate cooler for incineration in the kiln. In the process of alternative fuel disposal in the kiln, some alternative fuels will bring in more volatile harmful components such as sulfur, chlorine, and alkali. They will circulate and enrich in the cement kiln, causing system crusting, etc., affecting the normal operation of the firing system. At the same time, some will be taken out with the clinker, thus affecting the quality of cement. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a bypass venting system for VOCS waste gas in an environmental protection workshop that adopts coordinated treatment to replace raw fuel, thereby reducing harmful elements in the cement kiln system, alleviating the risk of crusting in the preheater, and realizing the coordinated treatment of VOCs waste gas.

[0004] The technical solution adopted by the utility model to solve its technical problems is: construct a bypass venting system for collaboratively treating VOCS waste gas from an alternative raw fuel environmental protection workshop, including a waste gas collection system connected to the alternative raw fuel environmental protection workshop, the waste gas collection system is respectively connected to a primary cooling source VOCs waste gas air supply system and a secondary cooling source VOCs waste gas air supply system, the primary cooling source VOCs waste gas air supply system is sequentially connected to a cyclone separator, a bag dust collector, a bypass system fan, a mixing chamber, a kiln head air supply system, a kiln head grate cooler, a rotary kiln, a kiln tail smoke chamber, a cement kiln denitration and desulfurization system, a kiln tail dust collection system and a chimney, the kiln tail smoke chamber is connected to a cyclone separator, and the secondary cooling source VOCs waste gas air supply system is connected to the mixing chamber.

[0005] According to the above solution, a coarse ash conveying device is provided at the bottom of the cyclone separator.

[0006] According to the above scheme, a fine ash conveying device is provided below the bag dust collector.

[0007] According to the above scheme, a high-temperature gate valve is provided between the kiln tail smoke chamber and the cyclone separator.

[0008] According to the above scheme, a first diverter valve is provided between the waste gas collection system and the primary cooling source VOCs waste gas air supply system.

[0009] According to the above scheme, a second diverter valve is provided between the waste gas collection system and the secondary cooling source VOCs waste gas air supply system.

[0010] According to the above scheme, a bypass tail exhaust ventilation butterfly valve is provided between the bypass system fan and the mixing chamber.

[0011] The bypass venting system of the utility model adopting the coordinated disposal of the VOCS waste gas of the environmental protection workshop of the raw fuel replacement has the following beneficial effects:

[0012] The utility model system reduces harmful elements in the cement kiln system, alleviates the risk of crusting in the preheater, realizes the coordinated treatment of VOCs waste gas, completes the coarse and fine separation of bypass ash, improves the efficiency of subsequent water washing and salt extraction, alleviates the emission pressure of cement enterprises, and saves the operating costs of cement enterprises. It is suitable for the later transformation of cement enterprises that use coordinated treatment to replace raw fuels and support water washing and salt extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0014] Figure 1 The utility model is a structural schematic diagram of a bypass venting system for VOCS waste gas in an environmental protection workshop that adopts coordinated disposal to replace raw fuel. DETAILED DESCRIPTION

[0015] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0016] like Figure 1 As shown, the bypass venting system of the utility model for collaboratively treating VOCS waste gas from an alternative raw fuel environmental protection workshop includes a waste gas collection system 4 connected to an alternative raw fuel environmental protection workshop 3, and the waste gas collection system 4 is respectively connected to a primary cooling source VOCs waste gas air supply system 6 and a secondary cooling source VOCs waste gas air supply system 14. The primary cooling source VOCs waste gas air supply system 6 is sequentially connected to a cyclone separator 7, a bag dust collector 9, a bypass system fan 11, a mixing chamber 15, a kiln head air supply system 16, a kiln head grate cooler 17, a rotary kiln 18, a kiln tail smoke chamber 1, a cement kiln denitration and desulfurization system 19, a kiln tail dust collection system 20 and a chimney 21. The kiln tail smoke chamber 1 is connected to the cyclone separator 7, and the secondary cooling source VOCs waste gas air supply system 14 is connected to the mixing chamber 15.

[0017] Preferably, a coarse ash conveying device 8 is provided at the bottom of the cyclone separator 7 .

[0018] Preferably, a fine ash conveying device 10 is provided below the bag dust collector 9 .

[0019] Preferably, a high-temperature gate valve 2 is provided between the kiln tail smoke chamber 1 and the cyclone separator 7 .

[0020] Preferably, a first diverter valve 5 is provided between the waste gas collection system 4 and the primary cooling source VOCs waste gas air supply system 6 .

[0021] Preferably, a second diverter valve 13 is provided between the exhaust gas collection system 4 and the secondary cooling source VOCs exhaust gas air supply system 14 .

[0022] Preferably, a bypass tail exhaust ventilation butterfly valve 12 is provided between the bypass system fan 11 and the mixing chamber 15 .

[0023] Preferably, the primary cooling source VOCs waste gas air supply system 6 and the secondary cooling source VOCs waste gas air supply system 14 are frequency conversion interlocking control to ensure that the alternative fuel / raw material environmental protection workshop 3 maintains a slight negative pressure.

[0024] The cyclone separator 7 is used to rapidly cool the high-temperature flue gas and separate the coarse dust particles. The kiln tail smoke chamber 1 is connected to the cyclone separator 7 through a hot air duct. A surrounding interface is left on the hot air duct. This interface is connected to the VOCs exhaust air supply system 6 as a primary cooling source. After the hot flue gas merges with the primary cooling source, they enter the cyclone separator 7 together for rapid heat exchange and dust particle size separation. The coarse ash falls to the bottom of the cyclone separator 7 for collection, and then is sent to the decomposition furnace through the coarse ash conveying device 8. After rapid cooling and particle size separation, the flue gas The gas enters the bag filter 9 for gas-solid separation again. A fine ash conveying device 10 is provided under the ash hopper of the bag filter 9. The fine ash is sent to the water washing and salt extraction system for deep processing. The flue gas after two gas-solid separations is discharged through the bypass system fan 11, and is fully mixed and cooled again with the VOCs waste gas as the secondary cooling source. Then, it enters the high-temperature section of the kiln head grate cooler 17 to be incinerated in the kiln, and then is further processed through the cement kiln denitrification and desulfurization system 19, and then passes through the kiln tail dust collection system 20, and finally is discharged through the kiln tail chimney 21 to meet the emission standards.

[0025] The working principle of the utility model is as follows:

[0026] When working, first open the valves on each air duct, then turn on the fans along the pipeline. Under the action of the bypass system fan, a certain amount of high-temperature flue gas (1050~1250℃) passes through the high-temperature air duct from the kiln tail smoke chamber and merges with the VOCs exhaust gas from the primary cooling source into the cyclone separator. The temperature sensor is set at the outlet of the cyclone separator. The air supply system of the primary cooling source can adjust the air supply volume according to the temperature signal to rapidly cool the flue gas to 180~230℃. In the process of heat exchange, a part of the coarse dust particles will be separated and settled to the bottom of the cyclone separator. A coarse ash conveying device is provided to send it into the decomposition furnace. The flue gas after rapid cooling and particle size separation enters the bag dust collector for gas-solid separation again. A fine ash conveying device is provided under the ash hopper of the bag dust collector. The fine ash is sent to the water washing and salt extraction system for deep processing. The flue gas after two gas-solid separations is discharged through the bypass system fan, and is fully mixed and cooled again with the VOCs waste gas as the secondary cooling source, and then enters the high-temperature section of the kiln head grate cooler to be incinerated in the kiln, and then is further treated by the cement kiln denitrification and desulfurization system, and then passes through the kiln tail dust collection system, and finally is discharged through the kiln tail chimney to meet the emission standards.

[0027] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A bypass venting system for VOCS waste gas from an environmental protection workshop that uses collaborative treatment to replace raw fuel, characterized in that: It includes an exhaust gas collection system connected to the alternative raw material environmental protection workshop, the exhaust gas collection system is respectively connected to the primary cooling source VOCs exhaust gas air supply system and the secondary cooling source VOCs exhaust gas air supply system, the primary cooling source VOCs exhaust gas air supply system is sequentially connected to a cyclone separator, a bag dust collector, a bypass system fan, a mixing chamber, a kiln head air supply system, a kiln head grate cooler, a rotary kiln, a kiln tail smoke chamber, a cement kiln denitrification and desulfurization system, a kiln tail dust collection system and a chimney, the kiln tail smoke chamber is connected to the cyclone separator, and the secondary cooling source VOCs exhaust gas air supply system is connected to the mixing chamber.

2. The bypass venting system for VOCS waste gas from an environmental protection workshop using coordinated disposal of alternative raw fuels according to claim 1 is characterized in that: A coarse ash conveying device is provided at the bottom of the cyclone separator.

3. The bypass venting system for VOCS waste gas from an environmental protection workshop using coordinated disposal of alternative raw fuels according to claim 1 is characterized in that: A fine ash conveying device is arranged below the bag dust collector.

4. The bypass venting system for VOCS waste gas from an environmental protection workshop using coordinated disposal of alternative raw fuels according to claim 1 is characterized in that: A high-temperature gate valve is provided between the kiln tail smoke chamber and the cyclone separator.

5. The bypass venting system for VOCS waste gas from an environmental protection workshop using coordinated disposal of alternative raw fuels according to claim 1 is characterized in that: A first diverter valve is provided between the waste gas collection system and the primary cooling source VOCs waste gas air supply system.

6. The bypass venting system for VOCS waste gas from an environmental protection workshop using coordinated disposal of alternative raw materials and fuels according to claim 1 is characterized in that: A second diverter valve is provided between the waste gas collection system and the secondary cooling source VOCs waste gas air supply system.

7. The bypass venting system for VOCS waste gas from an environmental protection workshop using coordinated disposal of alternative raw fuels according to claim 1 is characterized in that: A bypass tail exhaust ventilation butterfly valve is arranged between the bypass system fan and the mixing chamber.

Images