Biomass crushing and storing explosion-proof system in power plant based on carbon dioxide environment

Abstract

The utility model provides a kind of power plant biomass crushing storage explosion-proof system based on carbon dioxide environment, including biomass feeder, and in the air inlet of biomass feeder is connected feeder protection gas pipeline, feeder protection gas pipeline is connected carbon dioxide protection gas;The discharge port of biomass feeder is connected biomass pulverizer, the air inlet side of biomass pulverizer is connected positive pressure carbon dioxide gas pipeline, and the powder outlet of biomass pulverizer is connected to fine powder separator by biomass powder pipeline, and the outlet of fine powder separator is connected biomass powder storehouse by powder tube.This utility model uses positive pressure, closed pulverizing system, with carbon dioxide gas as protection gas and transport medium, through the first grinding of biomass mill, the secondary separation of cyclone separator, reach the requirement of safety explosion-proof, to solve the problem of explosion-proof in the process of biomass crushing, storage.

Description

Technical Field

[0001] This utility model relates to a biomass pulverizing system for power plants, specifically to an explosion-proof system for crushing and storing biomass in a carbon dioxide environment, which can be applied to coal-fired power plants that require biomass co-firing. Background Technology

[0002] In the context of low-carbon retrofitting of coal-fired power plants, direct combustion and co-firing of biomass in coal-fired units is an important way to reduce emissions from thermal power units. Biomass has a high volatile content and is flammable and explosive; therefore, explosion-proof issues during pulverization and storage directly affect the safe operation of power plants. Existing biomass pulverization systems are mostly open systems, with raw materials in direct contact with air and transported using compressed air, posing a certain risk of explosion.

[0003] CN106964458A discloses an explosion-proof protection system for powder pulverization and conveying, comprising a gas replenishment and pressurization system, an airflow pulverization and separation conveying system, a dust collection system, and a gas recovery and pressurization system. The gas replenishment and pressurization system vaporizes liquid nitrogen into high-pressure inert gas for storage. The airflow pulverization system injects high-pressure inert gas at high speed into the pulverization chamber to pulverize the material into fine particles, which are then collected by a cyclone separator and a dust collector. The exhaust gas from the cyclone separator enters the dust collection system for further dust collection. The gas recovery and pressurization system collects, compresses, and stores the exhaust gas exiting the dust collection system in a buffer tank within the gas replenishment and pressurization system for recycling. However, this solution does not utilize power plant resources and has a high cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the explosion-proof problem in the process of biomass crushing and storage, and to provide an explosion-proof system for biomass crushing and storage in power plants based on a carbon dioxide environment.

[0005] To solve the above problems, this utility model is achieved through the following technical solution: An explosion-proof system for biomass crushing and storage in a power plant under a carbon dioxide environment includes a biomass feeder, with a protective gas pipeline connected to the feeder's air inlet and a carbon dioxide protective gas pipeline connected to the feeder's protective gas pipeline; the biomass feeder's outlet is connected to a biomass pulverizer, the biomass pulverizer's air inlet is connected to a positive pressure carbon dioxide gas pipeline, the biomass pulverizer's powder outlet is connected to a fine powder separator via a biomass powder pipeline, and the fine powder separator's outlet is connected to a biomass powder silo via a powder drop pipe.

[0006] The positive pressure carbon dioxide gas pipeline is also connected to the biomass powder silo via a carbon dioxide pipeline for fire protection.

[0007] The other end of the fine powder separator is connected to the biomass milling machine through an exhaust air duct, and an exhaust air fan is installed in the exhaust air duct.

[0008] Compared with existing technologies, this utility model has the following advantages: An explosion-proof system for biomass crushing and storage in a carbon dioxide environment employs a positive pressure, closed-loop grinding system, using carbon dioxide gas as both the protective gas and the transport medium. Through primary grinding in a biomass mill and secondary separation in a cyclone separator, the system achieves the required safety and explosion-proof performance, thus solving the explosion-proof problem during biomass crushing and storage. Furthermore, since the carbon dioxide gas can be obtained from carbon capture in power plants, safety is improved while reducing fire-fighting costs. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0011] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0012] like Figure 1 As shown, an explosion-proof system for biomass crushing and storage in a power plant under a carbon dioxide environment includes a biomass feeder 1, which can be a screw conveyor. A feeder protective gas pipeline 106 is connected to the air inlet of the biomass feeder 1, and the feeder protective gas pipeline 106 is connected to carbon dioxide protective gas. The outlet of the biomass feeder 1 is connected to a biomass pulverizer 2. The air inlet side of the biomass pulverizer 2 is connected to a positive pressure carbon dioxide gas pipeline 101. The powder outlet of the biomass pulverizer 2 is connected to a fine powder separator 4 through a biomass powder pipeline 104. The outlet of the fine powder separator 4 is connected to a biomass powder silo 3 through a powder drop pipe 105.

[0013] The positive pressure carbon dioxide gas pipeline 101 is taken from carbon capture obtained from the thermal power plant. Better yet, the positive pressure carbon dioxide gas pipeline 101 is also connected to the biomass powder silo 3 via the carbon dioxide pipeline 102 for fire fighting in the powder silo.

[0014] The other end of the fine powder separator 4 is connected to the biomass milling machine 2 through the exhaust air duct 103, and an exhaust air fan 5 is installed in the exhaust air duct 103.

[0015] The working principle of this utility model is as follows: Biomass feedstock is conveyed to biomass pulverizer 2 via biomass feeder 1. Positive pressure carbon dioxide gas (obtained from carbon capture in thermal power plants) is sent to biomass pulverizer 2 via positive pressure carbon dioxide gas pipeline 101. Positive pressure carbon dioxide gas pipeline 101 is also connected to biomass powder silo 3 via fire-fighting carbon dioxide pipeline 102 for use as fire-fighting gas. Under the protection of carbon dioxide gas, biomass feedstock is crushed in biomass pulverizer 2 and then sent to fine powder separator 4 via biomass powder pipeline 104. After separation by fine powder separator, most of the biomass powder falls into biomass powder silo 3 along powder drop pipe 105; while carbon dioxide exhaust gas containing a small amount of biomass powder is conveyed to the inlet of biomass pulverizer 2 via exhaust gas pipeline 103 and exhaust gas fan 5. In addition, carbon dioxide protective gas enters biomass feeder 1 via feeder protective gas pipeline 106 for explosion protection. This invention relates to a closed-loop crushing process under a carbon dioxide atmosphere, which is safe to operate and solves the explosion-proof problem of biomass crushing and storage. The carbon dioxide gas can be obtained from carbon capture in power plants, while also reducing fire protection costs.

[0016] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. An explosion-proof system for biomass crushing and storage in a power plant under a carbon dioxide environment, characterized in that: The system includes a biomass feeder (1), and a feeder protective gas pipe (106) is connected to the air inlet of the biomass feeder (1), and the feeder protective gas pipe (106) is connected to carbon dioxide protective gas (6); the outlet of the biomass feeder (1) is connected to a biomass milling machine (2), the air inlet side of the biomass milling machine (2) is connected to a positive pressure carbon dioxide gas pipe (101), the powder outlet of the biomass milling machine (2) is connected to a fine powder separator (4) through a biomass powder pipe (104), and the outlet of the fine powder separator (4) is connected to a biomass powder bin (3) through a powder drop pipe (105).

2. The explosion-proof system for biomass crushing and storage in a power plant under a carbon dioxide environment according to claim 1, characterized in that: The positive pressure carbon dioxide gas pipeline (101) is also connected to the biomass powder silo (3) via the carbon dioxide pipeline (102) for fire fighting in the powder silo.

3. The explosion-proof system for biomass crushing and storage in a power plant under a carbon dioxide environment according to claim 1, characterized in that: The other end of the fine powder separator (4) is connected to the biomass milling machine (2) through the exhaust air duct (103), and an exhaust air fan (5) is installed in the exhaust air duct (103).

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