Nozzle for coal water slurry pressurized gasification furnace

Abstract

The utility model relates to the technical field of coal gasification equipment, in particular to a nozzle for a coal water slurry pressurized gasification furnace, which comprises an outer nozzle and an inner nozzle, a threaded groove is arranged on the inner wall of the lower end of the outer nozzle, a threaded ring block is arranged on the outer wall of the lower end of the inner nozzle, and a separation ring block is arranged on the inner wall of the outer nozzle. A sealing ring acting with the outer wall of the inner nozzle is arranged on the separation ring block, an oxygen inlet is formed in the outer nozzle located between the threaded ring block and the separation ring block, an air ejection hole communicated with an inner cavity of the outer nozzle is formed in the inner nozzle, and a sealing piece attached to the outer wall of the top of the inner nozzle is arranged in a through hole in the top of the outer nozzle. A cooling water inlet and a cooling water outlet are formed in the outer nozzle between the sealing piece and the separating ring block; the problem that an existing nozzle needs to be integrally replaced, so that cost is too high is effectively solved, the replacement operation of the inner nozzle is very simple and convenient, meanwhile, the cooling effect of the whole nozzle is guaranteed, and the heat radiation resistance of the nozzle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gasification equipment, in particular to a nozzle for a water-coal slurry pressurized gasification furnace. Background Art

[0002] The water-coal slurry pressurized gasifier is a supporting equipment that processes coal into gas fuel in the form of water-coal slurry. During the operation of the water-coal slurry gasifier, water-coal slurry and oxygen are sprayed into the gasifier in parallel through the nozzle. Oxygen and coal slurry enter the gasifier through the nozzle, atomize and mix at the nozzle outlet, and then incompletely burn in the combustion chamber to generate fuel gas. Since oxygen and coal slurry have a high flow rate when leaving the nozzle head, the coal slurry particles will cause wear to the nozzle, affecting the service life of the nozzle. The nozzle needs to be replaced regularly. At the same time, the temperature in the combustion chamber of the gasifier is relatively high. The burner head is radiated by high temperature during use, which is prone to cracks, and also affects the service life of the nozzle to a large extent.

[0003] Existing nozzles for water-coal slurry pressurized gasification furnaces are all processed by integrated vacuum casting molding technology, which not only has high production and manufacturing costs, but also can only replace the nozzle as a whole when the nozzle head is worn, resulting in excessively high nozzle use costs. For example, the utility model patent with application number 2014207696758 discloses a new type of nozzle for water-coal slurry pressurized gasification furnace, including a nozzle end, a water cooling channel at the nozzle end, a ring-shaped water cooling channel, the water cooling channel inside the nozzle end face, and a water outlet above and below the water cooling channel, and the new type of nozzle for water-coal slurry pressurized gasification furnace is integrally vacuum cast. Although the new type of nozzle for water-coal slurry pressurized gasification furnace disclosed in the patent is cooled and cooled by setting a water cooling channel at the end, the heat radiation resistance of the nozzle is improved, but after the nozzle is worn, the nozzle of the water-coal slurry and oxygen parallel channels needs to be replaced as a whole. In addition, affected by the vacuum casting molding process, the cross-sectional area of ​​the water cooling channel is small, resulting in a limited cooling water flow per unit time, and it is impossible to ensure efficient cooling of the nozzle. Based on this, the present application proposes a nozzle for a water-coal slurry pressurized gasification furnace that can effectively solve the above-mentioned technical problems. Utility Model Content

[0004] The utility model aims to provide a nozzle for a water-coal slurry pressurized gasification furnace, so as to solve the shortcomings of the existing nozzle for a water-coal slurry pressurized gasification furnace mentioned in the background technology.

[0005] The utility model is realized by the following technical solutions:

[0006] A nozzle for a water-coal slurry pressurized gasification furnace comprises an outer nozzle and an inner nozzle arranged concentrically, a threaded groove is provided on the inner wall of the lower end of the outer nozzle, a threaded ring block matched with the threaded groove is provided on the outer wall of the lower end of the inner nozzle, a separating ring block is provided on the inner wall of the outer nozzle, a sealing ring acting with the outer wall of the inner nozzle is provided on the separating ring block, an oxygen inlet is provided on the outer nozzle located between the threaded ring block and the separating ring block, an air emission hole connected with the inner cavity of the outer nozzle is provided on the inner nozzle, a sealing member fitted with the outer wall of the top of the inner nozzle is provided in the top through hole of the outer nozzle, and a cooling water inlet and a cooling water outlet are provided on the outer nozzle located between the sealing member and the separating ring block.

[0007] After the outer nozzle and the inner nozzle of the water-coal slurry pressurized gasification furnace disclosed in the utility model are assembled in place, the annular gap between the outer nozzle and the inner nozzle is divided into a lower oxygen zone and an upper cooling water zone by a separating ring block and a sealing ring. During the water-coal slurry pressurized gasification process, oxygen can be continuously injected into the lower oxygen zone through the oxygen inlet, and the oxygen enters the inner nozzle through the vent hole and mixes with the water-coal slurry flowing through, and finally is ejected from the upper end of the inner nozzle for incomplete combustion. At the same time, the upper cooling water zone can continuously circulate and inject a large amount of cooling water through the cooling water inlet and the cooling water outlet to cool the top of the outer nozzle and the inner nozzle over a large area, thereby realizing rapid cooling of the entire nozzle top.

[0008] In addition, since the water-coal slurry only contacts the top channel of the inner nozzle during the rapid jetting process, it will only cause wear on the top of the inner nozzle. When the top channel of the inner nozzle is worn and needs to be replaced, first remove the entire nozzle from the gasifier, and then rotate the inner nozzle off the outer nozzle for replacement. After replacing the new inner nozzle, rotate it in the opposite direction until it is tightly connected to the sealing ring on the separation ring block, indicating that the assembly is complete, and finally install the entire nozzle on the gasifier again and put it into use.

[0009] As a further configuration of the above scheme, the outer nozzle and the inner nozzle are both of a structure that is wider at the bottom and narrower at the top, and the upper and lower ends of the outer nozzle and the inner nozzle are connected by a conical connecting section in the middle.

[0010] As a further configuration of the above solution, the separation ring block is arranged on the inner wall of the outer nozzle cone surface connecting section, and the sealing ring is arranged on the inner ring surface of the separation ring block.

[0011] As a further configuration of the above scheme, a plurality of the air-emitting holes are provided, and the plurality of the air-emitting holes are evenly arranged upward and inclined on the outer circumferential surface of the inner nozzle near the position of the separating ring block.

[0012] As a further configuration of the above solution, the cooling water inlet and the cooling water outlet are arranged one low and one high on both sides of the outer circular surface of the top of the outer nozzle.

[0013] As a further configuration of the above solution, a flange plate detachably connected to the gasifier is provided at the lower end of the outer nozzle.

[0014] Compared with the prior art, the utility model has at least the following beneficial effects:

[0015] The nozzle for the water-coal slurry pressurized gasification furnace disclosed in this patent adopts a split design of an outer nozzle and an inner nozzle. Since the water-coal slurry only contacts the top of the inner nozzle during the injection process, only the top of the inner nozzle will be worn. When the nozzle needs to be replaced due to wear, it is only necessary to remove the old inner nozzle and assemble the new inner nozzle with the outer nozzle without replacing the entire nozzle. This effectively solves the problem of the high cost of the existing nozzles requiring overall replacement. At the same time, the assembly between the outer nozzle and the inner nozzle only requires direct screwing, which makes the replacement operation of the inner nozzle very simple and convenient.

[0016] The nozzle for a coal slurry pressurized gasification furnace disclosed in this patent can form a lower oxygen zone and an upper cooling water zone between the outer nozzle and the inner nozzle. During the water-coal slurry injection operation, oxygen can enter the water-coal slurry flowing through unimpeded for mixing. At the same time, the upper cooling water zone formed between the outer nozzle and the top of the inner nozzle has a sufficiently large heat exchange area, so that the amount of cooling water passing through per unit time is larger, and a large area of ​​cooling and cooling can be performed on the top of the outer nozzle and the inner nozzle, thereby ensuring the cooling effect of the entire nozzle and improving the nozzle's resistance to thermal radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2 It is a three-dimensional half-section structure schematic diagram of the utility model;

[0020] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the utility model after the outer nozzle and the inner nozzle are separated.

[0021] In the figure: 1-external nozzle, 101-thread groove, 2-inner nozzle, 201-gas hole, 3-flange, 4-thread ring block, 5-separating ring block, 6-sealing ring, 7-oxygen inlet, 8-sealing element, 9-cooling water inlet, 10-cooling water outlet. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 3 , and describes the application in detail with reference to embodiments. Example 1

[0024] Example 1 discloses a nozzle for a water-coal slurry pressurized gasification furnace, comprising an outer nozzle 1 and an inner nozzle 2 arranged concentrically, and both the outer nozzle 1 and the inner nozzle 2 are arranged in a structure that is wide at the bottom and narrow at the top, and the upper and lower ends of the outer nozzle 1 and the inner nozzle 2 are connected by a conical connecting section in the middle.

[0025] A thread groove 101 is provided on the inner wall of the lower end of the outer nozzle 1, and a flange 3 is connected to the lower end of the outer nozzle 1, and the entire nozzle can be detachably connected to the water-coal slurry pressurized gasification furnace through the flange 3. A threaded ring block 4 adapted to the thread groove 101 is provided on the outer wall of the lower end of the inner nozzle 2, and a sealing thread structure is used to connect the threaded ring block 4 and the thread groove 101, so that the lower end of the outer nozzle 1 can be completely sealed after the two are screwed together.

[0026] A separation ring block 5 is provided on the inner wall of the conical connection section of the outer nozzle 1, and a sealing ring 6 is provided on the inner ring surface of the separation ring block 5 to interact with the outer wall of the conical connection section of the inner nozzle 2. An oxygen inlet 7 is connected to the outer nozzle 1 between the separation ring block 5 and the thread groove 101, and a plurality of upwardly inclined gas injection holes 201 are evenly provided on the outer circumferential surface of the inner nozzle 2 near the separation ring block 5, so that the oxygen introduced from the oxygen inlet 7 can enter the inner nozzle 2 through the gas injection holes 201 to be mixed with the water-coal slurry and injected.

[0027] A through hole is provided at the top of the outer nozzle 1 for extending the top of the inner nozzle 2 , and a sealing member 8 is provided in the through hole which fits tightly with the outer wall of the top of the inner nozzle 2 , so that the inner nozzle 2 can be sealed by the sealing member 8 after extending out of the outer nozzle 1 .

[0028] Finally, a cooling water inlet 9 and a cooling water outlet 10 are respectively arranged on the outer circumferential surface of the outer nozzle 1 between the separation ring block 5 and the sealing member 8, and the cooling water inlet 9 and the cooling water outlet 10 are respectively arranged on both sides of the outer circumferential surface of the outer nozzle 1, one low and one high.

[0029] During use of the nozzle for the water-coal slurry pressurized gasification furnace disclosed in this embodiment 1, the inner nozzle 2 is concentrically arranged inside the outer nozzle 1, and the lower end of the inner nozzle 2 is threadedly sealed with the outer nozzle 1 through the threaded ring block 4, the outer wall of the conical connecting section of the inner nozzle 2 is tightly fitted with the sealing ring 6 to achieve upper and lower separation, and the top of the inner nozzle 2 is tightly fitted with the sealing member 8, so that the annular gap between the outer nozzle 1 and the inner nozzle 2 is divided into a lower oxygen zone and an upper cooling water zone.

[0030] During the process of pressurized injection of water-coal slurry, the water-coal slurry is transported upward from the lower end of the inner nozzle 2, oxygen is introduced into the lower oxygen zone from the oxygen inlet 7, and then injected into the inner nozzle 2 from the gas ejection hole 201 to mix with the water-coal slurry, and the mixed water-coal slurry is then injected from the top of the inner nozzle 2 into the gasifier for incomplete combustion. During the combustion process, cooling water is introduced into the upper cooling water zone from the cooling water inlet 9 through the external water cooling system, and the top of the external nozzle 1 and the inner nozzle 2 are cooled at the same time, and then discharged from the cooling water outlet 10, thereby realizing the flow of large-flow cooling water and ensuring the cooling effect of the entire nozzle.

[0031] Since the water-coal slurry only contacts the top channel of the inner nozzle 2 during the rapid jetting process, when the top channel of the inner nozzle 2 is worn and needs to be replaced, first remove the entire nozzle from the gasifier, then rotate the inner nozzle 2 off the outer nozzle 1 for replacement, and after replacing the new inner nozzle 2, rotate it in the opposite direction until it is tightly fitted with the sealing ring 6 on the separating ring block 5, indicating that the assembly is complete, and finally install the entire nozzle on the gasifier again and put it into use.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nozzle for a water-coal slurry pressurized gasifier, characterized in that: It comprises an outer nozzle and an inner nozzle which are arranged concentrically, a threaded groove is provided on the inner wall at the lower end of the outer nozzle, a threaded ring block which matches the threaded groove is provided on the outer wall at the lower end of the inner nozzle, a separating ring block is provided on the inner wall of the outer nozzle, a sealing ring which acts on the outer wall of the inner nozzle is provided on the separating ring block, an oxygen inlet is provided on the outer nozzle located between the threaded ring block and the separating ring block, an air emission hole which is connected with the inner cavity of the outer nozzle is provided on the inner nozzle, a sealing member which fits with the outer wall of the top of the inner nozzle is provided in the top through hole of the outer nozzle, and a cooling water inlet and a cooling water outlet are provided on the outer nozzle located between the sealing member and the separating ring block.

2. The nozzle for a water-coal slurry pressurized gasifier according to claim 1, characterized in that: The outer nozzle and the inner nozzle are both in a structure that is wide at the bottom and narrow at the top, and the upper and lower ends of the outer nozzle and the inner nozzle are connected by a conical connecting section in the middle.

3. The nozzle for a water-coal slurry pressurized gasifier according to claim 2, characterized in that: The separation ring block is arranged on the inner wall of the outer nozzle conical surface connecting section, and the sealing ring is arranged on the inner ring surface of the separation ring block.

4. The nozzle for a water-coal slurry pressurized gasifier according to claim 1, characterized in that: There are multiple air-emitting holes, which are evenly arranged on the outer circumferential surface of the inner nozzle near the position of the separating ring block in an inclined upward manner.

5. The nozzle for a water-coal slurry pressurized gasifier according to claim 1, characterized in that: The cooling water inlet and the cooling water outlet are arranged one low and one high on both sides of the outer circular surface of the top of the outer nozzle.

6. The nozzle for a water-coal slurry pressurized gasifier according to claim 1, characterized in that: The lower end of the outer nozzle is provided with a flange plate which is detachably connected to the gasifier.

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