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Circulation loop system for powder and circulation method for powder

A circulating loop and powder technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problems of inability to form return materials, easy gas backflow, and formation of air resistance, etc., and achieve a simple structure and easy operation Effect

Active Publication Date: 2018-01-12
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small packing density of type A and type C particles, they cannot accumulate in the feeder to form air resistance, so it is completely impossible to cut off the negative pressure difference between the gas-solid separator and the bottom of the riser, resulting in the gas in the riser It is easy to flow back to the gas-solid separator, which not only fails to form the return material, but also destroys the separation of the gas-solid separator and the fluidization of the riser

Method used

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  • Circulation loop system for powder and circulation method for powder
  • Circulation loop system for powder and circulation method for powder
  • Circulation loop system for powder and circulation method for powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] like figure 1 The circulation loop system for Class A and / or Class C powders shown is composed of a riser 1, a gas-solid separator 2 and a return channel 3 connected in sequence, wherein the return channel 3 includes a vertical pipe section, a section A U-shaped pipe section and a section of horizontal pipe section, the upper end of the vertical pipe section is connected with the solid outlet of the gas-solid separator 2, and one end of the horizontal pipe section is connected with the bottom side wall of the riser 1.

[0043] The bottom of the U-shaped pipe section of the return channel 3 is provided with an air charging port 4, which is used to blow in the pulverized coal that is transported by pulverized coal exhaust gas. The powder in the vertical pipeline of the return channel 3 flows from top to bottom, passes through the U-shaped pipe section and the horizontal pipe section, and then enters the riser. In the mixture of pulverized coal and pulverized coal exhaust...

Embodiment 2

[0047] like figure 2 The circulation loop system for powder shown is composed of a riser 1, a gas-solid separator 2 and a return channel 3 connected in sequence, wherein one end of the return channel 3 is connected to the solid outlet of the gas-solid separator 2 , and the other end is connected with the bottom of the riser 1 through a cone.

[0048] The bottom of the return channel 3 located directly below the riser 1 is provided with an inflation port 4, which is used to blow the mixture of powder and gas to form an upward jet flow and cause local negative pressure, so that the powder in the return channel 3 enters Riser. The amount of gas blown through the gas filling port 4 makes the fluidization velocity in the riser exceed the terminal settling velocity of the powder. Since the driving force of the powder flow in the return passage 3 is not the material column pressure in the conventional circulating fluidized bed, the pipe section of the return passage 3 located belo...

Embodiment 3

[0050] like image 3 Shown is a more compact circulation loop system for powder, which is formed by sequentially connecting a riser 1, a gas-solid separator 2 and a return channel 3, wherein one end of the return channel 3 is connected to the gas-solid separator The solid outlet of 2 is connected, and the other end is connected with the bottom side wall of riser 1.

[0051] The outer wall of the return channel at the connection between the return channel 3 and the bottom side wall of the riser 1 is provided with an air charging port 4 for blowing gas, and the riser 1 is provided with a feed port 5 for adding powder.

[0052] Gas is blown through the gas filling port 4 to form a jet flow from the return channel to the riser, providing power for the powder to flow along the return channel 3 to the riser, and making the powder in the riser flow upwards at a rate exceeding the terminal settling velocity. Enter the gas-solid separator 2.

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Abstract

The invention relates to a circulation loop system for powder, comprising: a riser; a gas-solid separator, the outlet of the riser is connected to the inlet of the gas-solid separator; a return channel, one end of the return pipe is separated from the gas-solid The solid outlet of the device is connected, and the other end is connected with the inlet of the riser. The riser, the gas-solid separator and the return channel are connected in sequence to form a circulation loop. The return channel is provided with at least one gas charging port, and the gas charging port is suitable for Blowing gas or a mixture of powder and gas, the gas filling port is configured so that the direction of the jet flow is consistent with the flow direction of the gas-solid flow from the gas-solid separator to the riser; and a control system for controlling the gas or The flow rate and flow rate of the mixture of powder and gas to form a jet that creates negative pressure and is used to control the total amount of gas blown so that the fluidization velocity in the riser is higher than the terminal settling velocity or entrainment velocity of the powder. The invention also relates to a powder circulation method.

Description

technical field [0001] The invention relates to the technical field of fluidization, in particular to a fluidization system for powder. technical background [0002] As a high-efficiency gas-solid mixer, circulating fluidized bed has been widely used in the reaction between gas and granular solids, such as coal combustion, coal gasification, drying of wet solids, desulfurization and purification of flue gas , catalytic cracking of petroleum, etc.; it is usually composed of a riser, a gas-solid separator, and a feeder connected in sequence. , Fluidize the particles in the riser; the feeder returns the particles separated by the gas-solid separator to the riser. [0003] The basic principle of the circulating fluidized bed is to use the speed difference between the gas and the solid particles, that is, the drag force generated by the gas at a higher speed on the particles at a lower speed makes the particles flow, and the drag force is not only related to the speed between th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/24
Inventor 那永洁高鸣吕清刚
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI