Gasification furnace with liquid level self-balancing function

Abstract

The disclosure provides a gasification furnace with liquid level self-balancing function, which comprises a furnace body, a spray assembly arranged on a quenching section of the furnace body in sequence from top to bottom, and a plurality of washing assemblies; the spray assembly comprises a transverse spray pipe and a longitudinal spray pipe which are in communication with each other, the transverse spray pipe penetrates through the side wall of the furnace body, and the pipe opening of the longitudinal spray pipe faces downward; the washing assembly comprises a transverse washing pipe and a longitudinal washing pipe which are in communication with each other; the transverse washing pipe penetrates through the side wall of the furnace body, and the pipe opening of the longitudinal washing pipe faces upward; the pipe opening of the longitudinal washing pipe is located at the same horizontal plane as the cooling liquid in the quenching section and is in an overflow state; a longitudinal washing pipe coaxial with the longitudinal spray pipe is arranged below the longitudinal spray pipe; the gasification furnace of the disclosure combines the spray assembly and the plurality of washing assemblies to meet the requirement of liquid level self-balancing in the quenching section in a water overflow and ash removal manner, realizes the effect of efficient cooling and fly ash wetting in the crude synthetic gas, and reduces the burden of downstream equipment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coal chemical industry, and particularly relates to a gasification furnace with a liquid level self-balancing function. BACKGROUND

[0002] The quenching chamber of the existing gasification furnace generally adopts a quenching ring, a downcomer and an upcomer or a bubble breaking plate structure. High-temperature coarse synthesis gas containing slag is rapidly cooled by the quenching water discharged from the quenching ring, and then enters a liquid pool along the downcomer to be washed and cooled again by water bath. The ash and slag are discharged from the bottom of the quenching chamber, and the coarse synthesis gas is turned back to go up, so as to realize gas-slag separation. Since the coarse synthesis gas turns back to go up in the liquid pool at the lower part of the downcomer, on the one hand, the liquid level in the quenching chamber fluctuates sharply.

[0003] On the other hand, there is also a gas liquid carrying phenomenon. The existing technology generally adopts an upcomer or a bubble breaking plate to realize stable liquid level and reduce the liquid carrying phenomenon. However, practical application shows that the above washing and cooling structure cannot effectively solve the synthesis gas liquid carrying phenomenon, and is prone to cause unstable liquid level when the load fluctuates, which brings challenges to manual operation.

[0004] At present, some technologies also propose a gasification furnace with a self-balancing liquid level and a radiation waste pot, but the technical scheme still has many deficiencies. SUMMARY

[0005] In view of the above problems in the prior art, the present disclosure provides a gasification furnace with a liquid level self-balancing function, which is simple in structure, easy to operate and convenient to control the liquid level.

[0006] To achieve the above purpose, the technical scheme adopted by the embodiments of the present application is as follows:

[0007] The present application provides a gasification furnace with a liquid level self-balancing function, which comprises a furnace body, a spray assembly and a plurality of washing assemblies arranged on the quenching section of the furnace body in sequence from top to bottom; the spray assembly comprises a horizontal spray pipe and a vertical spray pipe which are in communication with each other, the horizontal spray pipe penetrates the side wall of the furnace body, and the pipe opening of the vertical spray pipe is downward; the washing assembly comprises a horizontal washing pipe and a vertical washing pipe which are in communication with each other; the horizontal washing pipe penetrates the side wall of the furnace body, and the pipe opening of the vertical washing pipe is upward; the pipe opening of the vertical washing pipe is at the same horizontal plane as the cooling liquid in the quenching section and is in an overflow state; and the lower part of the vertical spray pipe is provided with the vertical washing pipe coaxial with the vertical spray pipe.

[0008] In some embodiments of the present disclosure, the gasification furnace with a liquid level self-balancing function comprises two groups of the washing assemblies.

[0009] In some embodiments of the present disclosure, the washing assembly further comprises a Venturi tube; the Venturi tube comprises a converging tube and a throat tube in sequence; the Venturi tube is embedded in the longitudinal washing pipe, and is closedly connected between the opening of the converging tube and the opening of the longitudinal washing pipe, and forms a closed loop.

[0010] In some embodiments of the present disclosure, the washing assembly further comprises an elbow; one end of the transverse washing pipe is communicated with the longitudinal washing pipe through the elbow; the other end of the transverse washing pipe is communicated with a gas-liquid outlet.

[0011] In some embodiments of the present disclosure, the longitudinal washing pipe is arranged close to the side wall of the furnace body and is staggered with a slag notch above the quenching section.

[0012] In some embodiments of the present disclosure, the closed loop is arranged in a zigzag shape.

[0013] In some embodiments of the present disclosure, the converging tube is arranged at an opening angle of 25° to 30°, and the length of the throat tube is greater than or equal to 150 mm.

[0014] In some embodiments of the present disclosure, the opening of the longitudinal spray pipe is provided with at least one atomizing nozzle, and the spray boundary formed by the longitudinal spray pipe is greater than the diameter of the throat tube.

[0015] In some embodiments of the present disclosure, the opening of the transverse spray pipe is communicated with a quenching liquid inlet on the side wall of the quenching section.

[0016] In some embodiments of the present disclosure, the quenching section is provided with a jacket.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The gasification furnace with liquid level self-balancing function of the present disclosure combines the spray assembly and multiple washing assemblies, and enters the washing assembly through water overflow, which not only meets the demand of liquid level self-balancing of the quenching section, but also realizes the effects of efficient cooling, sufficient wetting and removal of fly ash in the crude synthesis gas, and reduces the burden of the downstream treatment equipment; and the overall structure is simple, and solves the problem of liquid level control of the traditional quenching section. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic view of a gasification furnace with liquid level self-balancing function according to an embodiment of the present disclosure;

[0020] Figure 2 FIG. 2 is a top view of a gasification furnace with liquid level self-balancing function according to an embodiment of the present disclosure;

[0021] Figure 3A structure schematic diagram of a washing assembly of a gasification furnace with liquid level self-balancing function.

[0022] Legend of reference signs

[0023] 1 - furnace body; 2 - lower slag outlet; 3 - quenching section; 4 - jacket;

[0024] 5 - spray assembly; 51 - horizontal spray pipe; 52 - vertical spray pipe

[0025] 6 - washing assembly; 61 - horizontal washing pipe; 62 - vertical washing pipe; 63 - venturi;

[0026] 64 - closed loop 65 - elbow

[0027] 631 - reducer; 632 - throat pipe DETAILED DESCRIPTION

[0028] Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, but not as a limitation of the present application. In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail below in conjunction with the drawings and specific embodiments. Hereinafter, the embodiments of the present disclosure will be further described in detail in conjunction with the drawings and specific embodiments, but not as a limitation of the present disclosure.

[0029] All the terms used in the present disclosure (including technical terms or scientific terms) are the same as the meanings understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted to have meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or excessively formalized sense, unless specifically defined here.

[0030] Techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be considered as part of the specification.

[0031] In the field of coal chemical industry, due to the turn-back of the crude synthesis gas in the lower part of the downcomer, on the one hand, it causes the violent fluctuation of the liquid level in the quenching section, on the other hand, there is a gas-carrying-liquid phenomenon, which makes the washing and cooling effect unstable. In order to avoid the above problems, the present application provides the following solutions.

[0032] Reference should be made to Figure 1, provide a gasifier with liquid level self-balancing function, it includes: furnace body 1, spray assembly 5 and multiple sets of washing assembly 6 arranged on the quenching section 3 of furnace body 1 from top to bottom in sequence, preferably, including two sets of washing assembly 6, in the embodiment, two sets of washing assembly 6 can be arranged symmetrically with the axis of the gasifier, so that the washing cooling process in the gasifier is balanced and completed; spray assembly 5 includes: transverse spray pipe 51 and longitudinal spray pipe 52 which are communicated with each other, transverse spray pipe 51 penetrates the side wall of furnace body 1, and the nozzle of longitudinal spray pipe 52 is downward; washing assembly 6 includes: transverse washing pipe 61 and longitudinal washing pipe 62 which are communicated with each other; transverse washing pipe 61 penetrates the side wall of furnace body 1, and the nozzle of longitudinal washing pipe 62 is upward; the nozzle of longitudinal washing pipe 62 is at the same horizontal plane with the cooling liquid in the quenching section 3 and is in overflow state; the lower part of longitudinal spray pipe 52 is correspondingly provided with longitudinal washing pipe 62 coaxial with it.

[0033] Through the above embodiment, due to the corresponding arrangement of spray assembly 5 and multiple sets of washing assembly 6, the quenching section 3 of the gasifier not only meets the requirement of liquid level self-balancing, but also realizes the effects of efficient cooling, sufficient wetting and removal of fly ash in the crude synthetic gas, thereby reducing the burden of downstream processing equipment; and the overall structure is simple and easy to process and assemble; at the same time, the problem of traditional quenching section liquid level control is solved.

[0034] In the foregoing embodiment, in order to improve the effect of sufficient wetting of fly ash, the nozzle of longitudinal spray pipe 52 is provided with at least one atomizing nozzle (not shown in the figure), and the spray boundary formed by longitudinal spray pipe 52 is greater than the diameter of throat pipe 632; that is to say, by arranging multiple atomizing nozzles, the spray boundary can completely cover the opening area of throat pipe 632, so that the fly ash entering the quenching section 3 can be fully wetted, thereby effectively improving the effects of crude synthetic gas cooling and sufficient wetting and removal of fly ash. In particular, in the embodiment, the atomizing nozzle is selected from hollow cone type or solid cone type pressure atomizing nozzle; the opening angle of the atomizing nozzle is set to 30°-100°, the neck diameter of the atomizing nozzle is 6-15mm, the flow rate of medium through the atomizing nozzle is not more than 25m / s, and the droplet diameter of atomized medium is not more than 500 microns.

[0035] Further, the washing assembly 6 further includes a venturi 63; in combination with Figure 1 and Figure 3, the Venturi tube 63 comprises a converging tube 631 and a throat tube 632 connected in sequence; the Venturi tube 63 is embedded in the longitudinal washing pipe 62, and is connected in a closed manner between the pipe opening of the converging tube 631 and the pipe opening of the longitudinal washing pipe 62, and forms a closed loop 64. Through this arrangement, when the liquid level is higher than the pipe opening, the liquid directly overflows into the converging tube 631; and due to the structural characteristics of the converging tube 631, the liquid entering the converging tube 631 can flow downward at a high speed, avoiding the accumulation of liquid causing stagnation. In addition, in the present embodiment, the Venturi tube 63 is coaxially arranged with the longitudinal washing pipe 62. Further, the converging angle of the converging tube 631 is arranged to be 25° to 30°, and the length of the throat tube 632 is ≥ 150 mm. In particular, the flow rate of the medium passing through the throat tube 632 is selected to be 20-60 m / s, which prolongs the service life while ensuring the washing efficiency.

[0036] Further, referring to Figure 3 , the washing assembly 6 further comprises an elbow 65; one end of the transverse washing pipe 61 is connected to the longitudinal washing pipe 62 through the elbow 65; the other end of the transverse washing pipe 61 is connected to the gas-liquid outlet. Through this arrangement, the high-temperature impurities in the liquid are prevented from stagnating in the connecting section between the transverse washing pipe 61 and the longitudinal washing pipe 62. In addition, in order to improve the service life of the transverse washing pipe 61, the flow rate of the medium passing through is particularly limited as necessary, for example, the flow rate is not more than 15 m / s.

[0037] In an embodiment, in combination with Figure 1 and Figure 2 , the longitudinal washing pipe 62 is arranged close to the side wall of the furnace body 1 and offset from the tap hole 2 located above the quenching section 3. Through this arrangement, the gas ash in the raw material gas entering from the upper tap hole 2 can be effectively prevented from directly entering the longitudinal washing pipe 62 due to insufficient wetting, in particular, directly entering the Venturi tube 63.

[0038] In the above embodiment, the cross-sectional shape of each component included in the washing assembly 6 can be selected to be circular, oval or other special shape; preferably, it is selected to be circular. The specific shape structure can be selected according to actual needs and in combination with specific application scenarios, which is not limited further herein.

[0039] In an embodiment, the closed loop 64 is arranged in a zigzag shape, through which the accumulated ash on the liquid surface can directly flow into the Venturi tube 63.

[0040] In an embodiment, referring to Figure 1 , the pipe opening of the transverse spray pipe 51 is connected to the quenching liquid inlet on the side wall of the quenching section 3. Through this arrangement, the flow of fluid medium for cooling and wetting is effectively improved for the quenching section 3. For example, industrial circulating cooling water.

[0041] In an embodiment, referring to Figure 1The quenching section 3 is provided with a jacket 4. Through the setting mode, the furnace body 1 of the gasification furnace in the quenching section 3 is protected from high-temperature corrosion of the high-temperature ash for a long time, so as to improve the service life of the furnace body 1 and prolong the maintenance cycle. The cooling liquid of the jacket 4 enters the jacket 4 through the jacket 4 inlet provided on the furnace body 1 of the gasification furnace, and is discharged from the upper part of the jacket 4, so as to form a water film on the wall surface of the jacket 4 in contact with the gas phase, thereby realizing the protection effect.

[0042] The working principle of the gasification furnace with the liquid level self-balancing function according to the embodiment of the present application is briefly introduced as follows:

[0043] The crude synthesis gas and the ash from the gasification section or the radiant waste boiler section enter the quenching section 3, the ash falls into the liquid pool of the quenching section 3, and the crude synthesis gas is fully mixed and washed with the spray above and in the venturi tube 63 of the washing assembly 6 before entering the washing assembly 6 through the atomizing assembly, wherein the fly ash in the crude synthesis gas is fully wetted in the process. The cooling liquid (black water) in the liquid pool of the quenching section 3 enters the washing assembly 6 in the form of overflow, that is, enters the venturi tube 63, and flows into the gas-liquid outlet of the gasification furnace together with the crude synthesis gas to enter the downstream process.

[0044] Furthermore, although illustrative embodiments are described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of

[0045] The above description is intended to be illustrative, and not restrictive. For example, the above-described examples (or one or more aspects thereof) can be used in combination with each other. Other embodiments are possible upon reading the above description, for example. Also, in the above detailed description, various features are grouped together in one or more embodiments for the purpose of streamlining the disclosure. This should not be interpreted as intending that the disclosed features are essential to any claim. Thus, the following claims are hereby incorporated into the detailed description, by way of example or embodiment, in which each claim is hereby considered as a separate embodiment, and the embodiments can be combined with each other in various combinations or permutations. The scope of the application should be determined with reference to the appended claims, and the full scope of equivalents to which such claims are entitled.

Claims

1. A gasifier with a self-balancing liquid level function, characterized in that, It comprises: a furnace body, a spray assembly and a plurality of washing assemblies arranged on a quenching section of the furnace body in sequence from top to bottom; the spray assembly comprises a transverse spray pipe and a longitudinal spray pipe in communication with each other, the transverse spray pipe penetrates the side wall of the furnace body, and the longitudinal spray pipe has a downward nozzle; the washing assembly comprises a transverse washing pipe and a longitudinal washing pipe in communication with each other; the transverse washing pipe penetrates the side wall of the furnace body, and the longitudinal washing pipe has an upward nozzle; the nozzle of the longitudinal washing pipe is located at the same horizontal plane as the cooling liquid in the quenching section and is in an overflow state; a longitudinal washing pipe coaxial with the longitudinal spray pipe is arranged below the longitudinal spray pipe; the washing assembly further comprises an elbow; one end of the transverse washing pipe is in communication with the longitudinal washing pipe through the elbow; the other end of the transverse washing pipe is in communication with a gas-liquid outlet; the longitudinal washing pipe is close to the side wall of the furnace body and is arranged staggered with a slag outlet above the quenching section.

2. The gasifier with liquid level self-balancing function according to claim 1, characterized in that, It comprises two groups of the washing assembly.

3. The gasifier with liquid level self-balancing function according to claim 1, characterized in that, The washing assembly further comprises a Venturi tube; the Venturi tube comprises a converging pipe and a throat pipe in sequence; the Venturi tube is embedded in the longitudinal washing pipe, is closedly connected between the nozzle of the converging pipe and the nozzle of the longitudinal washing pipe, and forms a closed loop.

4. The gasifier with liquid level self-balancing function according to claim 3, characterized in that, The closed loop is arranged in a zigzag shape.

5. The gasifier with liquid level self-balancing function according to claim 3, characterized in that, The converging pipe has an opening angle of 25° to 30°, and the throat pipe has a length of ≥150mm.

6. The gasifier with liquid level self-balancing function according to claim 3, characterized in that, The nozzle of the longitudinal spray pipe is provided with at least one atomizing nozzle, and the spray boundary formed by the longitudinal spray pipe is greater than the diameter of the throat pipe.

7. The gasifier with liquid level self-balancing function according to claim 1, characterized in that, The nozzle of the transverse spray pipe is in communication with a quenching liquid inlet on the side wall of the quenching section.

8. The gasifier with liquid level self-balancing function according to claim 1, characterized in that, The quenching section is provided with a jacket.

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