Uniform feeding and air locking device for alternative fuel

Abstract

The utility model discloses an alternative fuel uniform feeding and air locking device, which comprises a pneumatic gate valve, a screw feeder, a horizontal rotary air locking valve and a furnace body, and is characterized in that the pneumatic gate valve is arranged above a feed port of the screw feeder, a discharge port of the screw feeder is connected with the horizontal rotary air locking valve, and the horizontal rotary air locking valve is connected with the furnace body. The horizontal rotary air locking valve and the screw feeder are coaxially arranged, and the other end of the horizontal rotary air locking valve is connected with the furnace body; and the upper shell and the lower shell of the horizontal rotary air locking valve are respectively pressed by a spring. The horizontal rotation air locking valve is adopted for feeding, the upper shell and the lower shell, wrapping the rotation blades, of the horizontal rotation air locking valve are pressed through the springs, the material blocking and bouncing function is achieved, the problems of bridging, blocking, material blocking and the like in alternative fuel conveying can be effectively avoided, and feeding continuity and uniformity are guaranteed; the screw feeder adopts a reducing pipe which is matched with the horizontal rotary air locking valve, so that the air locking effect can be achieved, meanwhile, the layout is compact, and the occupied space is small.

Description

Technical Field

[0001] The utility model relates to a feeding and air locking device, in particular to a uniform feeding and air locking device for alternative fuels. Background Art

[0002] Alternative fuel technology has become the preferred process for carbon emission reduction in the cement industry due to its significant carbon emission reduction effect and low emission reduction cost. The alternative fuel feeding device is an essential component of the alternative fuel process equipment. The continuity and sealing of its feeding play an important role in the stable operation and working condition regulation of the cement kiln. If the feeding device feeds discontinuously, it is very easy to cause fluctuations in the working conditions of the cement kiln, which in turn affects the stable operation of the system and the quality of the clinker. If the air lock at the feed port is not tight, it is easy to leak air, which will increase the heat consumption of the cement kiln and reduce the effectiveness of the use of alternative fuels. In addition, some alternative fuels (such as waste textiles and biomass) have high volatility and are easy to burn. If the air lock at the feed port is not tight, backfire will occur, and fire accidents are likely to occur.

[0003] Chinese patent CN221122278U discloses an air-locking feeding device for alternative fuels in cement kilns. This device locks air through an air-locking feeding mechanism located below a conveying mechanism and connected to the kiln body via a connecting mechanism. When conveying lightweight, long, fluffy alternative fuels with low bulk density, or when handling large quantities, this feeding device can easily form a blockage at the feed inlet, preventing discharge.

[0004] The feeding end of the feeding and air locking device of the biomass fluidized bed gasifier provided by Chinese patent CN218893631U adopts a heavy hammer flap valve and a material seal to achieve a sealing effect. However, this will result in the discharge of alternative fuel after squeezing. The discharge method is intermittent discharge in strands, resulting in discontinuous discharge and a large instantaneous feed volume, which causes temperature and pressure fluctuations inside the gasifier and affects the stable operation of the gasifier. Utility Model Content

[0005] Purpose of the utility model: The purpose of the utility model is to provide a uniform feeding and air locking device for alternative fuels to ensure the continuity and uniformity of the feeding of alternative fuels.

[0006] Technical solution: The utility model includes a pneumatic gate valve, a screw feeder, a horizontal rotary air lock valve and a furnace body, and is characterized in that the pneumatic gate valve is arranged above the feed port of the screw feeder, the discharge port of the screw feeder is connected to the horizontal rotary air lock valve, and the horizontal rotary air lock valve and the screw feeder are coaxially arranged, and the other end of the horizontal rotary air lock valve is connected to the furnace body; the upper shell and the lower shell of the horizontal rotary air lock valve are respectively tightened by elastic pressing devices.

[0007] The screw feeder includes a shell, and a shaftless screw is provided inside the shell. One end of the shaftless screw is connected to the drive motor, and the other end extends into the horizontal rotary air lock valve. A tapered reducer is connected to the horizontal rotary air lock valve at one end of the shell close to the horizontal rotary air lock valve, and the transition between the large end and the small end is smooth.

[0008] The large end of the tapered reducing pipe has the same diameter as the shell, and the small end has the same diameter as the feed port of the horizontal rotary air lock valve.

[0009] A smoke sensor is provided inside the tapered reducer; the smoke sensor is interlocked with the pneumatic gate valve. When positive pressure tempering occurs in the furnace chamber inside the furnace body or a fire occurs at the end of the spiral feeder, the smoke sensor senses the smoke signal and the pneumatic gate valve is closed to prevent the spread of the fire.

[0010] The horizontal rotary air lock valve adopts a horizontal feeding and horizontal discharging form.

[0011] The upper shell and the lower shell of the horizontal rotary air lock valve are wrapped with rotary blades. The rotation direction of the rotary blades of the horizontal rotary air lock valve is from top to bottom when observed from its feed port, and from bottom to top when observed from its discharge port.

[0012] The feed inlet of the furnace body is provided with a feed inlet slope, the angle between the feed inlet slope and the horizontal direction is ≥60°, and the feed inlet slope is provided on the refractory material of the furnace body.

[0013] The pneumatic gate valve is a double-layer pneumatic gate valve. When the feeding device is feeding normally, the pneumatic gate valve is in an open state. When feeding is not required, the pneumatic gate valve is in a closed state.

[0014] Beneficial effects: The utility model has the following advantages:

[0015] 1) The alternative fuel uniform feeding and air lock device provided by the present invention adopts a horizontal rotary air lock valve for feeding. The upper and lower shells of the horizontal rotary air lock valve that wrap the rotating blades are compressed by an elastic compression device, which has a function of rebounding when stuck. This can effectively avoid problems such as bridging, blockage, and jamming in the delivery of alternative fuels, and ensure the continuity and uniformity of feeding.

[0016] 2) The utility model adopts a tapered reducer in the alternative fuel screw feeder, and its outlet is circular, which cooperates with the horizontal rotary air lock valve to play the role of air lock, while the layout is compact and takes up little space;

[0017] 3) The utility model provides a smoke sensor on the reducer at the end of the screw feeder, which is interlocked with the pneumatic gate valve above the feed port of the screw conveyor. When abnormal operating conditions or backfire occur inside the furnace, the supply of alternative fuel can be cut off to ensure the safety of the conveying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, the utility model is an alternative fuel uniform feeding and air locking device, comprising a pneumatic gate valve 1, a screw feeder 2, a horizontal rotary air locking valve 3 and a furnace body 4, wherein the pneumatic gate valve 1 is arranged above the feed port of the screw feeder 2, the discharge port of the screw feeder 2 is connected to the horizontal rotary air locking valve 3, and the horizontal rotary air locking valve 3 is coaxially arranged with the screw feeder 2, and the horizontal rotary air locking valve 3 is connected to the furnace body 4.

[0021] The pneumatic gate valve 1 is a double-layer pneumatic gate valve. When the feeding device is feeding normally, it is in the open state. When feeding is not required, the pneumatic gate valve 1 is in the closed state.

[0022] The screw feeder 2 includes a shell 201, a shaftless screw 202, a tapered reducer 203, a smoke sensor 204 and a drive motor 205. A shaftless screw 202 is provided inside the shell 201. One end of the shaftless screw 202 is transmission-connected to the drive motor 205, and the other end is inserted into the horizontal rotary air lock valve 3. The shell 201 is cylindrical or U-shaped. A tapered reducer 203 is connected to the horizontal rotary air lock valve 3 at one end of the shell 201 close to the horizontal rotary air lock valve 3. The large end of the tapered reducer 203 has the same diameter as the shell 201, and the small end has the same diameter as the feed port of the horizontal rotary air lock valve 3. A circular outlet is used, and a smooth transition is made between the large end and the small end. The tapered reducer 203 cooperates with the horizontal rotary air lock valve 3 to achieve a better air lock effect. The horizontal rotary air lock valve 3 itself is an air lock mechanism. The spiral feeder 2 uses the tapered reducer 203 to reduce the ventilation area, reduce air leakage, and further improve the air lock effect.

[0023] A smoke sensor 204 is provided inside the tapered reducer 203; the smoke sensor 204 is interlocked with the pneumatic gate valve 1. When positive pressure tempering occurs in the furnace chamber inside the furnace body 4 or a fire occurs at the end of the screw feeder 2, the smoke sensor 204 senses the smoke signal, and the pneumatic gate valve 1 is closed to prevent the spread of the fire.

[0024] The horizontal rotary air lock valve 3 adopts horizontal feeding and horizontal discharging forms, including an upper shell and a lower shell. The upper and lower shells are wrapped with rotary blades 301. The rotation direction of the rotary blades 301 of the horizontal rotary air lock valve 3 is from top to bottom when observed from its feed port, and from bottom to top when observed from the discharge port.

[0025] The upper and lower shells of the horizontal rotary air lock valve 3 adopt a mirrored structure, and the upper and lower shells are respectively compressed by an elastic clamping device 302. The elastic clamping device 302 of this embodiment is spring-loaded, and the shells are compressed by the spring. Both the upper and lower shells are provided with a limit position, which is the normal air lock position, that is, the position when there is no material blockage. When feeding stops, the spring presses the shell to the limit position. When feeding starts and a material blockage occurs, when the upper or lower shell is squeezed, the corresponding shell is ejected by overcoming the spring pressure to increase the passage area, and the blocked material is transported out. After the blockage passes, the corresponding shell returns to the limit position under the action of the spring pressure.

[0026] The furnace body 4 can be a decomposition furnace, a gasification furnace, a pre-combustion furnace or other furnace with negative pressure inside. The furnace body feed port is provided with a feed port slope 402, which is set on the refractory material 401 of the furnace body 4, and the angle between the feed port slope 402 and the horizontal direction is ≥60°.

[0027] The alternative fuel delivery process of the utility model is as follows:

[0028] When alternative fuel is required, pneumatic gate valve 1 opens, allowing the fuel to enter screw feeder 2 through pneumatic gate valve 1. Driven by shaftless screw 202, the fuel moves to horizontal rotary air lock valve 3, where it is pulled out by rotating blades 301 and falls onto ramp 402 of furnace body 4, ultimately entering the furnace chamber of furnace body 4. If positive pressure flashback occurs in the furnace chamber of furnace body 4 or a fire occurs at the end of screw feeder 2, smoke sensor 204 senses the smoke signal, causing pneumatic gate valve 1 to close to prevent the spread of the fire. When the alternative fuel supply is stopped, pneumatic gate valve 1 closes, maintaining safe isolation between the device and the upstream alternative fuel delivery equipment.

Claims

1. A uniform feeding and air locking device for alternative fuels, comprising a pneumatic gate valve, a screw feeder, a horizontal rotary air locking valve and a furnace body, characterized in that: The pneumatic gate valve is arranged above the feed port of the screw feeder, the discharge port of the screw feeder is connected to the horizontal rotary air lock valve, and the horizontal rotary air lock valve is coaxially arranged with the screw feeder, and the other end of the horizontal rotary air lock valve is connected to the furnace body; the upper shell and the lower shell of the horizontal rotary air lock valve are respectively tightened by elastic pressing devices.

2. The uniform feeding and air locking device for alternative fuel according to claim 1, characterized in that: The screw feeder includes a shell, and a shaftless screw is provided inside the shell. One end of the shaftless screw is connected to the drive motor, and the other end extends into the horizontal rotary air lock valve. A gradually reducing diameter pipe is connected between the end of the shell close to the horizontal rotary air lock valve and the horizontal rotary air lock valve.

3. The uniform feeding and air locking device for alternative fuel according to claim 2, characterized in that: The large end of the tapered reducing pipe has the same diameter as the shell, and the small end has the same diameter as the feed port of the horizontal rotary air lock valve.

4. The uniform feeding and air locking device for alternative fuel according to claim 3, characterized in that: A smoke sensor is provided inside the tapered reducing pipe; the smoke sensor is interlocked with the pneumatic plug-in valve.

5. The uniform feeding and air locking device for alternative fuel according to claim 1, characterized in that: The horizontal rotary air lock valve adopts a horizontal feeding and horizontal discharging form.

6. The alternative fuel uniform feeding and air locking device according to claim 5, characterized in that: The upper shell and the lower shell of the horizontal rotary air lock valve are wrapped with rotary blades.

7. The alternative fuel uniform feeding and air locking device according to claim 1, characterized in that: The feed inlet of the furnace body is provided with a feed inlet slope, and the angle between the feed inlet slope and the horizontal direction is ≥60°.

8. The alternative fuel uniform feeding and air locking device according to claim 1, characterized in that: The pneumatic gate valve is a double-layer pneumatic gate valve.

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