CN2677021Y

CN2677021Y - Injection type mixer

Info

Publication number: CN2677021Y
Application number: CN 200420005615
Authority: CN
Inventors: 庞玉学; 刘武烈; 万蓉; 庞彪
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-03-01
Filing date: 2004-03-01
Publication date: 2005-02-09
Anticipated expiration: 2014-03-01

Abstract

The utility model provides an injection type mixer, which is formed from the connection of a tube body and a spray head; the tube body comprises an inner tube and an outer tube, and the spray head comprises an inner layer and an outer layer. The lower end of the outer tube is connected with the outer layer of the spray head, and the upper end of the outer tube is in tight connection with the outer wall of the inner tube via a ring plate. The lower end of the inner tube is connected with the inner layer of the spray head, and the inner layer of the spray head is provided with a flow return pore; the inner layer of the spray head and the outer layer of the spray head are provided with a plurality of through holes which are communicated with each other. The upper end of the wall of the outer tube is provided with a cooling medium air inlet, and the outer surface of the outer layer of the spray head is coated with a heat insulating layer with high temperature resistance. The utility model makes use of the cooling medium for conducting the cooling against the spray head which is under the high temperature condition; after the pre-mix of the cooling medium and the main medium, the cooling medium can be sprayed in definite flow velocity and appropriate angle and finally implement the purposes of fully mixing with a section of the inverting gas. The utility model can ensure the even mixture of multiple gas, play the action of the cooling, and prevent the spray head from being burned out by high temperature; an integration is formed by the welding of a seamless steel tube and a thin steel plate. The utility model has simple structure, easy manufacture, and convenient maintenance.

Description

A kind of ejector mixing

Technical field

The utility model relates to a kind of blender, and especially a kind of ejector mixing that is used for high-temp combustion belongs to chemical industry equipment manufacturing technology field.

Background technology

At present, be raw material with natural gas, oven gas, casing-head gas, oil and coal tar, produce in the device of synthesis gas, in the process of its conversion, various media need be carried out premix.For example: be raw material with the natural gas, produce in the device of ammonia or methyl methanol syngas, the equipment of most critical is secondary reformer, main chemical reactions is the conversion reaction of methane in the stove, this reaction is a kind of endothermic reaction, its thermal source is from burning hydrogen and methane, and the burning of hydrogen and methane is to carry out in the environment of aerobic.Therefore, must introduce air or oxygen-enriched air or pure oxygen at the secondary reformer burner.For can be safely, fully burning, the oxygenous physical efficiency that requires to introduce is mixed equably with one section reformed gas, and finish burning at the upper space of secondary reformer burner beds, avoid causing hot-spot because of mixing inequality, so that cause the burning of refractory liner in the secondary reformer, fire bad catalyst, even fire the major accident of bad equipment.

According to investigation and relevant data report, no matter be domestic or external so far, in the various devices of synthetic ammonia, methyl alcohol and hydrogen manufacturing, the accident rate of secondary reformer is very high.For example: major accident just took place twice in 1 year in the secondary reformer operation of domestic certain factory, once was the secondary reformer overtemperature, and the heat-resistant lining layer burns out, and water leg is blown up; Another time is sintering of catalyst, and upstream device burns out, and causes very big economic loss to enterprise.According to investigations, domestic enterprise does not almost have an equipment that accident did not take place at up to a hundred secondary reformers of operation.Studying carefully its cause of accident, all cause burning out owing to overtemperature without exception, and the reason of overtemperature is relevant with the structural material and the spray orifice air velocity of burner blender, is the problem of most critical so solve structure, material, the spray orifice flow velocity of blender.

Existing blender is by material, and can be divided into two kinds: a kind of is metal material, and another kind is nonmetallic materials; Blender also can be divided into two kinds: porous type and Venturi type by structure.From result of use, the blender heat resistance of nonmetallic materials is better, easy burn-out not, but that air-flow distributes is undesirable; Metal material blender resistance to elevated temperatures is relatively poor, is burnt out easily, and this is to cause the key point that factory can not safe long-term operation.

The utility model content

Technical problem to be solved in the utility model is, at the deficiencies in the prior art, provides a kind of ejector mixing that is used for high-temp combustion, can guarantee the even mixing of all gases, can play cooling effect again, and the protection shower nozzle is not destroyed by high temperature; Whole for seamless steel pipe and book welded steel plate form, it is simple in structure, making is easy, maintenance is convenient.

Technical problem to be solved in the utility model is achieved by the following technical solution:

A kind of ejector mixing, it is formed by connecting by body and shower nozzle, body is made up of interior pipe and outer tube, outer tube is located at its central authorities with interior circumference of cannon bone, and in, outer tube coaxially to each other, shower nozzle is by inside and outside two-layer the composition, the lower end of outer tube links to each other with shower nozzle is outer, its upper end is tightly connected by ring flat-plate and outer wall of inner tube, and the lower end of interior pipe links to each other with the shower nozzle internal layer, and the cavity that the outer inwall of cavity that outer wall of inner tube and outer tube wall enclosed and shower nozzle inner layer outer wall and shower nozzle is enclosed communicates with each other, form cooling chamber, the cavity that inner tube wall and shower nozzle internal layer inwall are enclosed forms the premix chamber, is provided with return port on the shower nozzle internal layer, and cooling chamber and premix chamber are communicated with, at shower nozzle internal layer and skin, offer an above through hole, and be connected by tubule each other, the upper end of outer tube wall offers the cooling medium air inlet.

For effectively preventing shower nozzle, be provided with high temperature resistant heat insulation layer at the outer field outer surface of shower nozzle owing to high temperature damages.

Therefore, the utility model utilizes cooling medium earlier the nozzle end that is in high temperature to be cooled off, and then after carrying out premixed with main medium, with certain flow velocity, suitable angle is sprayed from the shower nozzle end, reach at last and one section well-mixed purpose of reformed gas, both guaranteed the even mixing of two or more gases, and can play cooling effect again, made that shower nozzle is unlikely to be burnt out by high temperature, simple in structure, practical.

Description of drawings

Fig. 1 is the utility model stereochemical structure simplified schematic diagram;

Fig. 2 is the utility model structural representation sketch.

The specific embodiment

Below in conjunction with accompanying drawing the technical solution of the utility model is described in detail.

As shown in Figure 1 and Figure 2, be respectively stereochemical structure simplified schematic diagram of the present utility model and structural representation sketch.In conjunction with Fig. 1, Fig. 2 as can be known, the utility model is a kind of ejector mixing, it is formed by connecting by body 1 and shower nozzle 2, body 1 is made up of interior pipe 11 and outer tube 12, outer tube 12 encloses interior pipe 11 in the central, and in, outer tube coaxially to each other, shower nozzle 2 is by inside and outside two-layer the composition, the lower end of outer tube 12 links to each other with shower nozzle outer 22, its upper end is tightly connected by ring flat-plate 13 and interior pipe 11 outer walls, the lower end of interior pipe 11 links to each other with shower nozzle internal layer 21, the cavity that outer 22 inwalls of cavity that interior pipe 11 outer walls and outer tube 12 inwalls are enclosed and shower nozzle internal layer 21 outer walls and shower nozzle are enclosed communicates with each other, and forms cooling chamber, and the cavity that interior pipe 11 inwalls and shower nozzle internal layer 21 inwalls are enclosed forms the premix chamber, on shower nozzle internal layer 21, be provided with return port 23, cooling chamber and premix chamber are communicated with,, offer an above through hole at shower nozzle internal layer 21 and skin 22, and be connected by tubule 20 each other, the upper end of outer tube 12 tube walls offers cooling medium air inlet 14.

For effectively preventing shower nozzle 2, be provided with high temperature resistant heat insulation layer 221 at the outer surface of shower nozzle skin 22 owing to high temperature damages.

Ejector mixing in the course of the work, main medium enters shower nozzle 2 along the center of interior pipe 11, above-mentioned main medium comprises air or oxygen or oxygen-enriched air etc.; And cooling medium enters from outer tube A mouth, at first cooling effect is played in the end of shower nozzle 2, upwards carry out premix with main medium more then after, spray at a high speed from the aperture C of shower nozzle 2 ends, mix with one section reformed gas, finish follow-up course of reaction.

The utility model adopts a kind of resistant to elevated temperatures metal material manufacturing, in order to improve heat resistance, increases the service life, and has also adopted 2 effective measures, and the surperficial spraying plating that the first contacts with high-temperature combustion gas at shower nozzle 2 was not only high temperature resistant but also can adiabatic material layer 21; Its two be in indoor design a kind ofly can reach cooling, can carry out premixed structure again, as shown in drawings, air (or oxygen or oxygen enrichment) enters from the B mouth, cooling medium enters from the A mouth, the jacket layer annular space of shower nozzle 2 of flowing through earlier cools off nozzle end, and then utilizes suitable cooling medium to cool off by the ejection of C mouth again after returning the central tube bottom and air (or oxygen or oxygen-enriched air) mixes by the center, to be able to the purpose of long-term safety operation.

The utility model is also different with existing porous type injector on structural design, and existing porous type injector uses more injector (U.S. type) as domestic Large Scale Synthetic Ammonia Plants, does not all have pre-mixed configuration and end cooling structure.The airflow velocity ratio of spray orifice is existing big, and spray orifice is evenly distributed rationally.

As shown in Figure 1, interior pipe 11 of the present utility model and outer tube 12 all adopt seamless steel pipe to make, and whole for seamless steel pipe and book welded steel plate form, it is simple in structure, making is easy, maintenance is convenient.

Need to prove at last: above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1, a kind of ejector mixing, it is formed by connecting by body and shower nozzle, it is characterized in that: described body is made up of interior pipe and outer tube, outer tube is located at its central authorities with interior circumference of cannon bone, and in, outer tube coaxially to each other, shower nozzle is by inside and outside two-layer the composition, the lower end of outer tube links to each other with shower nozzle is outer, its upper end is tightly connected by ring flat-plate and outer wall of inner tube, and the lower end of interior pipe links to each other with the shower nozzle internal layer, and the cavity that the outer inwall of cavity that outer wall of inner tube and outer tube wall enclosed and shower nozzle inner layer outer wall and shower nozzle is enclosed communicates with each other, form cooling chamber, the cavity that inner tube wall and shower nozzle internal layer inwall are enclosed forms the premix chamber, is provided with return port on the shower nozzle internal layer, and cooling chamber and premix chamber are communicated with, at shower nozzle internal layer and skin, offer an above through hole, and be connected by tubule each other, the upper end of outer tube wall offers the cooling medium air inlet.

2, a kind of ejector mixing according to claim 1 is characterized in that: the outer field outer surface of described shower nozzle is provided with high temperature resistant heat insulation layer.