CN201049941Y - Burner with multi-path solid fuel inlet - Google Patents

Abstract

The utility model relates to an inflamer used for synthesis gas production by solid fuel in partial oxidation process, disclosing an inflamer with multiway fuel inlets and the application of the inflamer. The inflamer comprises an outer-ring nozzle, a middle-ring nozzle and an inner-ring nozzle which are arranged in sequence, and an outer-ring conduit, a middle-ring conduit and a central conduit which are respectively with the outer-ring nozzle, the middle-ring nozzle and the inner-ring nozzle; different from the general inflamer, the utility model is also provided with 2 -10 solid fuel delivery branches communicated with the central conduit; thus, the aperture of a solid fuel delivery pipe can be obviously reduced, the solid fuel mass flow-rate measurement difficulty resulted in the overlarge aperture of the current delivery pipe is avoided, and the evenness and the flow stability of the solid fuel distributed on the section of the pipe under high-concentration delivery; with more flexible and convenient mass flow-rate control, simple structure and convenient manufacture and maintenance, the utility model can be widely applied for the synthesis gas production by various solid matter containing carbon in the partial oxidation process.

Description

Burner with multiple solid fuel inlets

technical field

The utility model relates to a burner for preparing synthesis gas by partial oxidation of solid fuel.

technical background

How to efficiently and cleanly utilize solid fuel gasification to produce synthesis gas, fuel gas and reducing gas has always been a topic of concern in chemical production. Among the many gasification methods, people are generally optimistic about the entrained-bed gasification technology, which has many advantages such as high production intensity, high gasification efficiency, and strong adaptability to solid raw materials; among them, the burner (also called burner) is an entrained-bed gasification technology. One of the key equipment in gasification technology.

In order to form a good process effect and prolong the service life of the burner, the structural design of the burner is very important, which plays an important role in the final process result and equipment safety.

At present, there are various patented technologies for burners suitable for solid fuels, and some patented technologies have been applied in industrial production, for example, US Patents 4523529, 4736693, 4858538, European Patent 0328794 and Chinese Patent 200420114032.6. However, most of the existing burner patent technologies use a single feed, that is, the solid fuel is introduced into the burner through a delivery pipeline, and then enters the gasifier for partial oxidation reaction. When the gasification processing capacity is large, for example, the Shell gasification device with a daily processing capacity of 2,000 tons can use four single-feed burners, and the load corresponding to the fuel delivery pipeline of each burner is 500 tons. And the corresponding four sets of measuring instruments for oxidant, gasification agent and pulverized coal must be installed on the four-way pipeline. The burner and its supporting pneumatic conveying system suitable for this level have been industrially applied; however, for solid fuel daily For a medium-scale gasifier with a processing capacity, it is simpler and more economical to adopt the gasifier technology with one burner as described in Chinese patent 200410089404.9.

Under the condition that the burner has only one solid material inlet, compared with the gasification system equipped with multiple burners, for the gasification system equipped with only one burner, the inner diameter of the solid fuel delivery pipe must be greatly increased. The distribution of gas-solid two-phase flow on the cross-section of the pipeline is extremely uneven, resulting in unstable flow, and even difficult to strictly control the gasification process conditions, which affects the normal operation of pneumatic conveying. On the other hand, the larger pipe diameter also makes it difficult to accurately measure solid material conveying parameters (Y. Yan, FlowRate Measurement of Bulk Solids in Pneumatic Pipelines——Problems and Solutions, Bulk Solids Handling, Vol.15, 447-456, 1995 ), due to the inherent non-uniform distribution of gas-solid two-phase flow on the cross-section of the pipeline, there is still no reliable instrument in industrial production that can accurately measure the instantaneous mass flow rate of gas-solid two-phase flow in a larger pipe diameter, and At present, the research and development of solid mass flow rate measuring instrument is still in the laboratory stage.

It is known that the thickest pipeline measured by the solid mass flow rate measuring instrument currently used in industrial devices is the pulverized coal pneumatic conveying pipeline in the Shell pulverized coal pressurized gasification industrial device, and its inner diameter is not more than 60mm. The daily transportation capacity of the pipeline is about 600 tons of pulverized coal. At present, the manufacturer claims that the maximum diameter of the solid velocity measuring instrument that can be provided does not exceed 200mm.

Contents of the invention

The technical problem to be solved by the utility model is to disclose a burner with multiple solid fuel inlets, so as to overcome the above-mentioned defects in the prior art and meet the needs of industrial sectors.

The burner mentioned in the utility model includes an outer ring nozzle, a middle ring nozzle and an inner ring nozzle arranged coaxially in sequence, and an outer ring conduit, a middle ring nozzle and a central nozzle respectively connected with the outer ring nozzle, the middle ring nozzle and the inner ring nozzle. The conduit; it is characterized in that it also includes 2 to 10 solid fuel delivery branch pipes connected with the central conduit;

The burner proposed by the utility model is installed in a conventional entrained-bed gasification reactor, which can be used for the solid carbonaceous matter to be transported to the burner simultaneously by a plurality of delivery pipelines, and sprayed into the gasification reactor together with the gasification agent for gasification. Partial oxidation to produce synthesis gas.

When in use, the solid carbonaceous material and its carrier gas enter the central conduit through the delivery branch pipe, and then are sprayed into the gasification reactor by the inner ring nozzle; the oxidant enters the gasification reactor through the middle ring conduit, and the gasification agent passes through the outer ring conduit It is injected into the gasification reactor by the outer ring nozzle.

The solid fuel is selected from pulverized coal, petroleum coke, biomass, organic solid waste, etc.; the carrier gas is selected from nitrogen, carbon dioxide, water vapor, synthesis gas or a mixture thereof;

Said oxidant is selected from oxygen, air or a mixture thereof; said gasification agent is selected from water vapor, carbon dioxide or a mixture thereof;

The burner proposed by the utility model not only has the technical advantages and good process effects described in Chinese patents 200510025050.6, 200420114032.6 and the published patent 200510112302.9, but also avoids the delivery pipeline by rationally designing multiple solid fuel inlets on a single burner It is difficult to measure the flow rate of solid fuel caused by too large a caliber, and it also improves the uniformity and flow stability of the high-concentration gas-solid two-phase flow on the cross-section of the pipeline. The flow control of solid fuel is more flexible and convenient, and the structure is simple. It is easy to manufacture and maintain, and can be used in the partial oxidation of various solid carbonaceous substances to produce synthesis gas, and has a wide range of uses.

Description of drawings

Figure 1 is a schematic diagram of a burner with three solid fuel inlets.

Fig. 2 is a schematic diagram of the solid fuel delivery branch pipe tangent to the circle formed by the cross section of the central conduit.

Detailed ways

Referring to Fig. 1, said burner includes the outer ring nozzle 2, the middle ring nozzle 3 and the inner ring nozzle 8 which are coaxially arranged in sequence, and the outer ring nozzle 2, the middle ring nozzle 3 and the inner ring nozzle 8 which are respectively connected. Ring conduit 4, middle ring conduit 5 and central conduit 6; characterized in that it also includes 2 to 10 solid fuel delivery branch pipes 7 connected to the central conduit;

Preferably, referring to FIG. 1 , the angle α between the central axis of the solid fuel delivery branch pipe 7 and the central axis of the central conduit 6 is 5°-90°, preferably 10°-30°;

Preferably, referring to Fig. 2, said solid fuel delivery branch pipe 7 is tangent to the circle formed by the cross section of central conduit 6, preferably, the sum of the cross-sectional areas of said solid fuel delivery branch pipe 7 and central conduit 6 The ratio of the cross-sectional area is 1 to 1.5:1, and the preferred number of solid fuel delivery branch pipes 7 is preferably 3 to 6. Preferably, the other end of the central conduit 6 is connected or closed to the solid fuel delivery branch pipe 7, Preferably, the other end of the central conduit 6 is connected with a solid fuel delivery branch pipe 7;

Further, said inner ring nozzle 8 is a conical tube with internal contraction half-angle β and lateral inclination γ, said middle ring nozzle 3 is a conical tube with internal contraction half-angle δ and lateral inclination ε, and said outer ring Nozzle 2 is a conical tube with an inner contraction half-angle η;

The internal contraction half angle β of the said inner ring nozzle 8 is 1°～60°, and its lateral tilt angle γ is 20°～90°; the internal contraction half angle δ of the middle ring nozzle 3 is 0°～70°, and its lateral tilt angle ε is 20°～90°; the inner shrinkage half angle η of the outer ring nozzle 2 is 0°～70°;

The ratio of the nozzle diameter E of the inner spray head 8 to the height h of the straight section of the nozzle is h:d=0-10.

The distance s between the inner nozzle 8 and the nozzle end face of the middle ring nozzle 3 is 0-50 mm, and the distance t between the nozzle end face of the middle ring nozzle 3 and the outer ring nozzle 2 is 0-40 mm; The cooling chamber 1 outside the nozzle is used to protect the burner from being damaged by the high temperature inside the reactor, and its cooling form can be a coil type or a jacket type commonly used in industry.

Claims (6)

1. the burner that has multiplepath entrances of solid fuel, the outer shroud shower nozzle (2), middle ring spray head (3) and the interior ring spray head (8) that comprise coaxial setting successively, and the outer shroud conduit (4), middle ring conduit (5) and the centre pipe (6) that are connected with outer shroud shower nozzle (2), middle ring spray head (3) and interior ring spray head (8) respectively; It is characterized in that, also comprise 2～10 solid fuels conveying arms (7) that are connected with centre pipe (6).

2. the burner with multiplepath entrances of solid fuel according to claim 1 is characterized in that, the angle α between the central axis of said solid fuel conveying arm (7) and the central axis of centre pipe (6) is 5 °～90 °.

3. the burner with multiplepath entrances of solid fuel according to claim 2 is characterized in that, the angle α between the central axis of said solid fuel conveying arm (7) and the central axis of centre pipe (6) is 10 °～30 °.

4. the burner with multiplepath entrances of solid fuel according to claim 1 is characterized in that, said solid fuel carry arm (7) with and the formed circle of cross section of centre pipe (6) tangent.

5. the burner with multiplepath entrances of solid fuel according to claim 1 is characterized in that, it is 3～6 that solid fuel is carried the quantity of arm (7).

6. the burner with multiplepath entrances of solid fuel according to claim 1 is characterized in that, the other end of described centre pipe (6) is carried arm (7) to be connected with solid fuel or sealed.

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