CN102553508A

CN102553508A - Powder accelerating method

Info

Publication number: CN102553508A
Application number: CN2011103824832A
Authority: CN
Inventors: 熊新阳; 郭庆人; 郭文康; 周军; 唐复兴; 李自兵; 刘军
Original assignee: Xinjiang Tianye Group Co Ltd
Current assignee: Xinjiang Tianye Group Co Ltd
Priority date: 2011-11-11
Filing date: 2011-11-11
Publication date: 2012-07-11

Abstract

The invention belongs to the field of chemical machinery, and relates to a method for accelerating powder during powder pneumatic transport. The method adopts the following components which are connected in sequence: a powder conveying pipe, an accelerating gas chamber, a bulge, an accelerator clearance, a mixing chamber, a reducing segment and an accelerating region, wherein a bulge structure is arranged on the outer wall of the outlet of the powder conveying pipe, the inner wall of the mixing chamber is of a reducing segment structure, the accelerator clearance is formed by the reducing segment and the bulge, and the outlet of the mixing chamber is connected with the accelerating region; and powder enters a mixing region by the powder conveying pipe, the accelerating gas simultaneously enters the mixing chamber at high speed from the accelerating gas chamber through the accelerator clearance, the accelerating gas is mixed with the powder, and the gas-solid mixture is simultaneously mixed and accelerated in the mixing chamber and is further accelerated in the accelerating region. According to the invention, the reaction raw materials are accelerated before entering a reaction device, thus jet velocity is improved, and the homogenized powder can well carry out heat exchange with plasma jet after entering a reactor.

Description

The method that a kind of powder quickens

Technical field

The invention belongs to chemical machinery field, can be during particularly a kind of powder strength is carried to the method for powder acceleration.

Background technology

The powder Pneumatic Conveying Technology is apart from the history of existing more than 200 year of the present, and in nearly decades, solid fluidized technology is used in the physical operations and chemical operation in the chemical industry widely, and the coexistence of gas and powder grain material belongs to Dual-Phrase Distribution of Gas olid in Pneumatic conveying pipeline.Pneumatic Conveying Technology has been widely used in the long distances of powder materials such as cereal, cement, coal dust; Common strength is carried and is divided into by the concentration that is transferred material on engineering: dilute phase is carried with close and is carried mutually; Because the Dense Phase Pneumatic Conveying of powder has: efficient energy-saving, transporting velocity is low, and is less to materials quality and abrasion of conveying pipes influence, and the material of carrying in many industry strengths adopts close conveying mutually; Along with close popularizing of carrying mutually; Carry in the different unit operations of downstream user in strength; Because need carrying strength of technology also proposed some special requirements, for example: plasma coal preparing ethyne by cracking device pulverized coal system, its material must satisfy following technological requirement when getting into gas-solid phase reactor: improve effluxvelocity, avoid forming plug flow; Make stable, the homogenizing powder of powder flow, can atomize fast after getting into reactor.

A kind of coal dust injection apparatus of reactor for preparing ethyne by cracking plasma coal is disclosed in the Chinese patent 200920106388.8; Coal dust and high-temperature plasma jet well-mixed through the coal nozzle ejaculation; Can improve the acetylene yield effectively, and alleviate the reactor coking phenomenon; Disclose a kind of plasma high temperature carbon conversion reaction coal powder filling pipe in the Chinese patent 200810175333.2, it has coal dust and injects characteristics such as effective, that heat utilization efficiency is high, reactor is difficult for coking, cost is low, life cycle is long.These two patents disclose the device of coal dust entering reactor; But in coal dust entering reactor process, also exist coal dust entering conversion zone speed not enough; Stop up; The deficiency that the homogenizing degree is low, Chinese patent 200620035058.0 disclose the new type nozzle that particle quickens in a kind of air-flow pulverizing, and this technology adopts the design of sonic nozzle and substance nozzle; Reach the purpose of acceleration; But the deceleration gas of this method and powder get into to produce behind the mixing chamber and mix the inhomogeneous acceleration effect that influences, therefore research and develop a kind of effluxvelocity high, avoid stopping up, make that powder flow is stable, the homogenizing powder, the accelerator of condition such as can atomize fast behind the entering reactor is the problem that engineers and technicians thirst for solving.

Summary of the invention

The method that the object of the present invention is to provide a kind of powder to quicken; Can better carry out the caloic exchange with plasma jet after making the preacceleration of reaction raw materials entering reaction unit, raising effluxvelocity, homogenizing powder be convenient to get into reactor, be specially adapted to plasma coal preparing ethyne by cracking device coal dust injected system powder injected system.

The solution that realizes above-mentioned purpose is:

The method that a kind of powder quickens comprises the powder conveying pipe, quickens air chamber, bulge-structure, accelerator gap, mixing chamber, converging transition, acceleration region; Powder conveying pipe outlet outer wall is provided with bulge-structure, and the mixing chamber inwall is the converging transition structure, and converging transition and bulge-structure form the accelerator gap, and the outlet of mixing chamber is connected with acceleration region; Powder gets into the Mixed Zone through the powder conveying pipe, and gas gets into mixing chamber from quickening air chamber at a high speed through the accelerator gap simultaneously, and gas mixes with powder, quickens while the gas-solid phase mixture mixes in mixing chamber, is further quickened to acceleration region.

The method that described a kind of powder quickens, it is 0.1-20mm that converging transition and bulge-structure form gap size, forms the gap and makes gas get into mixing chamber at faster speed, makes it form low pressure in powder conveying pipe exit, prevents to stop up.

The method that described a kind of powder quickens, converging transition forms angle with bulge-structure and is of a size of 15-80 °, makes it quicken gas has shearing force to powder at entering mixing chamber place effect, homogenizing powder.

The method that described a kind of powder quickens, accelerator gap location gas flow rate degree is 3m/s-340m/s.

Converging transition and bulge-structure form the accelerator adjustable gaps among the present invention.

The present invention is the structure that combines Venturi tube, utilizes momentum transfer and principle of conservation of momentum to design; When powder gets into mixing chamber from the powder conveying pipe, quicken gas and powder and in mixing chamber, clash into each other, accomplish momentum-exchange, powder conveying pipe exit forms a low-pressure area, and powder constantly flows in the mixing chamber in the powder conveying pipe; Between converging transition and acceleration region, powder reaches same final speed with acceleration gas, produces the effect of quickening, and final powder gets into plasma stream reactor with certain flow velocity.

The invention has the advantages that: be that powder conveying pipe outlet outer wall is provided with bulge-structure, converging transition and bulge-structure form the accelerator gap, reach the purpose that improves acceleration, homogenizing powder.

Description of drawings

Fig. 1 is the structure chart of accelerator in the prior art.

Fig. 2 is the structural representation of the embodiment of the invention 1.

1 is that powder conveying pipe, 2 is that acceleration air chamber, 3 is that bulge-structure, 4 is that accelerator gap, 5 is that mixing chamber, 6 is that converging transition, 7 is an acceleration region.

Fig. 3 is software simulation figure of the present invention.

X-is a length, and y-is a speed, and interstitial velocity is 150m/s.

The specific embodiment

Embodiment 1

Shown in accompanying drawing 2: powder conveying pipe 1 outlet outer wall is established with bulge-structure 3; Bulge-structure 3 forms 50 ° of angles with converging transition 6; 4 high speeds enter into mixing chamber 5 to the gas of 5m/s-15m/s through the accelerator gap from quickening air chamber 2, and gas mixes with the powder that powder conveying pipe 1 comes out in mixing chamber 5, and mixing chamber 5 inwalls are tapered configuration; The outlet of mixing chamber 5 is connected with acceleration region 7; The mixture of powder and gas quickens while mixing in mixing chamber, and the gas-solid phase mixture that mixing chamber 5 comes out enters into acceleration region 7, and the gas-solid phase mixture is further quickened at acceleration region 7.

Embodiment 2 is that with the difference of embodiment 1 bulge-structure 3 and converging transition 6 form 15 ° of angles.

Embodiment 3 is that with the difference of

embodiment

1 or 2 bulge-structure 3 and converging transition 6 form 80 ° of angles.

Embodiment 4 is that with the difference of

embodiment

1,2 or 3 it is 0.1mm that converging transition 6 forms gap size with bulge-structure 3.

Embodiment 5 is that with the difference of

embodiment

1,2,3 or 4 it is 20mm that converging transition 6 forms gap size with bulge-structure 3.

Embodiment 6 can be provided with divergent segment in the outlet of acceleration region 7 with the difference of

embodiment

1,2,3,4 or 5, reaches the purpose that secondary quickens.

Claims

1. the method that powder quickens comprises the powder conveying pipe, quickens air chamber, bulge-structure, accelerator gap, mixing chamber, converging transition, acceleration region; It is characterized in that powder conveying pipe outlet outer wall is provided with bulge-structure, the mixing chamber inwall is the converging transition structure, and converging transition and bulge-structure form the accelerator gap, and the outlet of mixing chamber is connected with acceleration region; Powder gets into the Mixed Zone through the powder conveying pipe, and gas gets into mixing chamber from quickening air chamber at a high speed through the accelerator gap simultaneously, and gas mixes with powder, quickens while the gas-solid phase mixture mixes in mixing chamber, is further quickened to acceleration region.

2. the method that a kind of powder according to claim 1 quickens is characterized in that it is 0.1-20mm that converging transition and bulge-structure form gap size.

3. according to the method for claim 1 or 3 described a kind of powders acceleration, it is characterized in that converging transition and bulge-structure form angle and be of a size of 15-80 °.

4. the method that a kind of powder according to claim 1 quickens is characterized in that accelerator gap location gas flow rate degree is 3m/s-340m/s.