Coal water slurry injection device

Abstract

The utility model discloses a coal water slurry injection device, which comprises a sleeve, a mounting seat, a primary atomization unit and a secondary atomization unit, the primary atomization unit comprises a mixing pressurization component, an impact component and a current conversion component, and the mounting seat and the current conversion component are respectively sleeved at two ends of the sleeve. The mounting seat is provided with a slurry circulating hole communicated with the mixing and pressurizing component and a plurality of steam circulating holes communicated with the interior of the sleeve; the flow conversion component is provided with a first-stage tail end slurry flow channel and a first-stage tail end steam flow channel, the second-stage atomization unit comprises a second-stage starting end slurry flow channel and a second-stage starting end steam flow channel, and the two ends of the first-stage tail end slurry flow channel are connected with the tail end of the mixing pressurization component and the second-stage starting end slurry flow channel correspondingly; the first-stage tail end steam flow channel is connected with the interior of the sleeve and the second-stage starting end steam flow channel. Graded pressurization is adopted, the atomization unit can reduce the flowing speed of coal particles in the injection device as much as possible, and therefore erosive wear of the coal particles to all parts of the injection device is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water-coal slurry gasification, in particular to a water-coal slurry injection device. Background Art

[0002] The coal content in the water-coal slurry is about 70%, the chemical additive is about 1%, and the rest is water. The coal particles should reach a certain fineness, and the upper limit of the particle size is generally required to be 300 microns, of which the content of particles smaller than 200 mesh (74 microns) is not less than 75%. The water-coal slurry injection device uses high-speed steam flow to perform multi-stage atomization of the water-coal slurry. In the original water-coal slurry injection technology, the injection device adopts a two-stage atomization structure. All water-coal slurries and high-pressure steam are mixed in the primary atomization unit. Subsequently, the slurry-gas mixture is injected into the secondary atomization unit from the shrinkage structure at the end of the primary atomization. After entering the secondary atomization unit, the high-speed fluid hits the impact piece at the center. Finally, the slurry-gas mixture is injected from the circular and uniformly distributed injection holes at the end of the secondary atomization. Since all water-coal slurries and high-pressure steam are mixed in the primary atomization unit, the coal particles obtain greater kinetic energy in the primary atomization unit, causing severe wear of the shrinkage structure at the end of the primary atomization unit, the impact piece of the secondary atomization unit, and the injection port of the secondary atomization unit, which has become a problem that troubles users and manufacturers. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a water-coal slurry injection device to solve the above problems.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A water-coal slurry injection device comprises a sleeve and a mounting seat, a primary atomizing unit and a secondary atomizing unit connected in sequence from top to bottom, the primary atomizing unit comprises a mixing and pressurizing component, an impact component and a flow conversion component connected in sequence, the mounting seat and the flow conversion component are respectively sleeved on the two ends of the sleeve, the mounting seat is provided with a slurry flow hole connected to the mixing and pressurizing component and a plurality of steam flow holes connected to the inside of the sleeve, the mixing and pressurizing component is also connected to the inside of the sleeve; the flow conversion component is provided with a primary end slurry flow channel and a primary end steam flow channel which are staggered and evenly distributed along the circumference, the secondary atomizing unit comprises a secondary starting slurry flow channel and a secondary starting steam flow channel, the two ends of the primary end slurry flow channel are respectively connected to the end of the mixing and pressurizing component and the secondary starting slurry flow channel, the primary end steam flow channel is respectively connected to the inside of the sleeve and the secondary starting steam flow channel, and a primary wear-resistant part is provided in the mixing and pressurizing component.

[0006] In the above utility model, further, the slurry circulation hole is coaxially arranged with the mixing and pressurizing component, and the plurality of steam circulation holes are evenly arranged around the slurry circulation hole with the slurry circulation hole as the axis.

[0007] In the above-mentioned utility model, further, the mixing and pressurizing component includes a first-level starting slurry flow channel, a first-level pressurizing chamber and an impact chamber which are sequentially connected from top to bottom, the first-level starting slurry flow channel is connected to the slurry flow hole, and the first-level pressurizing chamber is evenly distributed along the circumferential direction obliquely above the first-level pressurizing chamber with a first-level starting steam flow channel connected to the inside of the casing.

[0008] In the above utility model, further, the first-level starting slurry flow channel, the first-level starting steam flow channel, the first-level pressurizing chamber and the inner surface of the impact chamber are all provided with first-level wear-resistant parts, and the first-level wear-resistant parts are all tubular structures.

[0009] In the above utility model, further, the impact component is a stepped cylindrical structure, the lower end of the impact component is provided with an external thread, the middle interior of the commutation component is provided with an external thread, and the impact component is fixed in the impact chamber by a threaded connection.

[0010] In the above-mentioned utility model, further, both the upper and lower ends of the sleeve are provided with internal threads, the mounting seat and the commutation component are provided with external threads, and the mounting seat and the commutation component are respectively fixed at the two ends of the sleeve through threaded connection; the bottom end of the mixing and pressurizing component is provided with external threads, and the upper part of the commutation component is provided with internal threads, and the mixing and pressurizing component is threadedly connected with the commutation component.

[0011] In the above-mentioned utility model, further, the secondary atomization unit also includes an atomization shell, a wear-resistant collar and a plurality of evenly distributed atomizing nozzles coaxially arranged with the secondary starting slurry flow channel, the atomizing nozzle is composed of a slurry outlet hole and a high-pressure steam outlet hole arranged crosswise and connected in a Y-shaped structure, the slurry outlet hole is connected with the secondary starting slurry flow channel, and the high-pressure steam outlet hole is connected with the secondary starting steam flow channel.

[0012] In the above utility model, further, the slurry outlet hole and the high-pressure steam outlet hole intersect at an angle of 45°.

[0013] In the above utility model, further, the slurry outlet hole and the high-pressure steam outlet hole are both provided with secondary wear-resistant parts, and the secondary wear-resistant parts are both countersunk tubular structures.

[0014] In the above utility model, further, a step for placing a wear-resistant collar is provided inside the atomizing housing.

[0015] The beneficial effects of the utility model are:

[0016] The utility model adopts graded pressurization and atomization units to reduce the flow speed of coal particles inside the injection device as much as possible, thereby greatly reducing the erosion and wear of various components of the injection device by coal particles. At the same time, a first-level wear-resistant part is provided in the first-level atomization unit to further increase the service life of the injection device. The atomization effect can also be improved by using a multi-stage pressurized atomization unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front cross-sectional view of the utility model;

[0018] Figure 2 for Figure 1 AA section view;

[0019] Figure 3 It is a structural schematic diagram of the mixing and pressurizing component of the utility model;

[0020] Figure 4 (a) is a front cross-sectional view of the commutation component of the utility model;

[0021] Figure 4 (b) Figure 4 (a) BB cross-sectional view;

[0022] Figure 5 It is a structural schematic diagram of the two-stage atomization unit.

[0023] In the figure, 1-mounting seat, 110-slurry circulation hole, 120-steam circulation hole, 2-first-level atomizing unit, 210-mixing and pressurizing component, 211-first-level starting slurry flow channel, 212-first-level pressurizing chamber, 213-impact chamber, 214-first-level starting steam flow channel, 215-first-level wear-resistant part, 220-impact component, 230-flow conversion component, 231-first-level end slurry flow channel, 232-first-level end steam flow channel, 3-secondary atomizing unit, 310-atomizing shell, 320-secondary starting steam flow channel, 330-atomizing nozzle, 331-slurry outlet hole, 332-high-pressure steam outlet hole, 340-secondary starting slurry flow channel, 350-wear-resistant collar, 360-secondary wear-resistant part, 4-sleeve. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Please refer to the attached Figure 1 and attached Figure 2 As shown, a water-coal slurry injection device includes a sleeve 4 and a mounting seat 1, a primary atomizing unit 2 and a secondary atomizing unit 3 connected in sequence from top to bottom, the primary atomizing unit 2 includes a mixing and pressurizing component 210, an impact component 220 and a flow conversion component 230 connected in sequence, the mounting seat 1 and the flow conversion component 230 are respectively sleeved on both ends of the sleeve 4, the mixing and pressurizing component 210 and the impact component 220 are placed in the sleeve 4, and the mounting seat 1 is provided with a slurry flow hole 110 connected to the mixing and pressurizing component 210 and a plurality of steam flow holes connected to the inside of the sleeve 4 120, wherein, preferably, the slurry circulation hole 110 is coaxially arranged with the mixing and pressurizing component 210, the multiple steam circulation holes 120 are evenly arranged around the slurry circulation hole 110 with the slurry circulation hole 110 as the axis, the mixing and pressurizing component 210 is also connected with the inside of the casing 4, the water-coal slurry enters the mixing and pressurizing component 210 from the slurry circulation hole 110 for the first pressurization and impact, and at the same time, the high-pressure steam enters the inside of the casing 4 from the multiple steam circulation holes 120, and part of the high-pressure steam enters the mixing and pressurizing component 210 to mix with the water-coal slurry and pressurize the water-coal slurry;

[0026] Please refer to the attached Figure 4 As shown, the said conversion component 230 is provided with a first-stage terminal slurry flow channel 231 and a first-stage terminal steam flow channel 232 which are evenly distributed along the circumference and staggered. The structure of the first-stage terminal slurry flow channel 231 is shown in the attached Figure 4 (b) shows, the structure of the first-stage end steam flow channel 232 is as shown in the accompanying figure (a), the second-stage atomization unit 3 includes a second-stage starting slurry flow channel 340 and a second-stage starting steam flow channel 320, the two ends of the first-stage end slurry flow channel 231 are respectively connected to the end of the mixing and pressurizing component 210 and the second-stage starting slurry flow channel 340, the first-stage end steam flow channel 232 is respectively connected to the inside of the casing 4 and the second-stage starting steam flow channel 320, specifically, the first-stage end slurry flow channel 231 is used to transport the water-coal slurry after the first pressurization and atomization in the mixing and pressurizing component 210 to the second-stage atomization unit 3 for secondary pressurization and atomization, the first-stage end steam flow channel 232 is used to transport part of the high-pressure steam inside the casing 4 to the second-stage atomization unit 3 for secondary mixing and atomization with the pressurized water-coal slurry, the first-stage end slurry flow channel 231 and the first-stage end steam flow channel 232 work independently and are not connected to each other;

[0027] In addition, a primary wear-resistant part 215 is provided in the mixing pressurizing component 210. The primary wear-resistant part 215 is made of cemented carbide to improve wear resistance and increase the service life of the equipment.

[0028] Please refer to the attached Figure 3As shown, the mixing and pressurizing component 210 includes a first-level starting slurry flow channel 211, a first-level pressurizing chamber 212 and an impact chamber 213 which are sequentially connected from top to bottom. The first-level starting slurry flow channel 211 is connected to the slurry flow hole 110, and the water-coal slurry enters the first-level pressurizing chamber 212 from the first-level starting slurry flow channel 211. The first-level pressurizing chamber 212 is evenly distributed along the circumferential direction with a first-level starting steam flow channel 214 which is connected to the inside of the casing 4 obliquely above the first-level pressurizing chamber 212. The high-pressure steam enters the first-level pressurizing chamber 212 through the first-level starting steam flow channel 214 to be preliminarily mixed with the water-coal slurry and pressurized and atomized. In order to better mix the water-coal slurry and the high-pressure steam in the first-level pressurizing chamber 212, the first-level starting steam flow channel 214 adopts a structure with multiple inclined through holes evenly distributed around the circumference.

[0029] In the above embodiment, preferably, since the impact wear of the water-coal slurry on the inner wall of the flow channel during the injection process is relatively serious, in order to increase the service life of the internal parts and the flow channel of the first-level atomization unit 2, the first-level starting slurry flow channel 211, the first-level starting steam flow channel 214, the first-level pressurized chamber 212 and the inner surface of the impact chamber 213 are provided with first-level wear-resistant parts 215, and the first-level wear-resistant parts 215 are all tubular structures adhered to the inner walls of each flow channel.

[0030] The impact component 220 is a stepped cylindrical structure. The lower end of the impact component 220 is provided with an external thread. The middle of the commutation component 230 is provided with an external thread. The impact component 220 is fixed in the impact chamber 213 through a threaded connection.

[0031] Please pay the monthly Figure 1 As shown, the upper and lower ends of the sleeve 4 are provided with internal threads, the mounting seat 1 and the flow conversion component 230 are provided with external threads, the mounting seat 1 and the flow conversion component 230 are respectively fixed to the two ends of the sleeve 4 through threaded connection, and the secondary atomization unit 3 is welded to the bottom of the flow conversion component 230; the bottom end of the mixing and pressurizing component 210 is provided with external threads, the upper part of the flow conversion component 230 is provided with internal threads, and the mixing and pressurizing component 210 and the flow conversion component 230 are threadedly connected.

[0032] Please refer to the attached Figure 5 As shown, the secondary atomization unit 3 also includes an atomization shell 310 coaxially arranged with the secondary starting slurry flow channel 340, a wear-resistant collar 350 and a plurality of evenly distributed atomizing nozzles 330. It can be seen from the accompanying drawings that the atomizing nozzle 330 is arranged at a certain angle to the central axis, and the atomizing nozzle 330 is composed of a slurry outlet hole 331 and a high-pressure steam outlet hole 332 which are cross-arranged and formed into a Y-shaped structure. The slurry outlet hole 331 is connected to the secondary starting slurry flow channel 340, and the high-pressure steam outlet hole 332 is connected to the secondary starting steam flow channel 320.

[0033] In the above embodiment, preferably, the slurry outlet hole 331 intersects with the high-pressure steam outlet hole 332 at an angle of 45°, so that the high-pressure steam in the high-pressure steam outlet hole 332 and the water-coal slurry after the first-stage pressurized atomization in the slurry outlet hole 331 are fully mixed and atomized.

[0034] In the above embodiment, preferably, in order to reduce the scouring and wear of the mixed slurry on the secondary atomization unit 3, the slurry outlet hole 331 and the high-pressure steam outlet hole 332 are both provided with secondary wear-resistant parts 360, and the secondary wear-resistant parts 360 are all countersunk tubular structures, and the inside of the atomization shell 310 is also provided with a step for placing the wear-resistant ring 350, and the service life of the secondary atomization unit 3 is increased by the wear-resistant ring 350 and the secondary wear-resistant part 360.

[0035] Specific working process:

[0036] First, the water-coal slurry enters from the slurry flow hole 110 and flows through the first-stage starting slurry flow channel 211 into the first-stage pressurization chamber 212. At the same time, high-pressure steam enters the inside of the casing 4 from multiple steam flow holes 120, and then enters the first-stage pressurization chamber 212 through the inclined first-stage starting steam flow channel 214 to mix with the water-coal slurry and pressurize the water-coal slurry. Then, the pressurized slurry in the first-stage pressurization chamber 212 flows through the constriction structure at the end of the first-stage pressurization chamber 212 and enters the impact chamber 213. The high-pressure slurry impacts and disperses on the impact component 220 and atomizes; then, the slurry after the first atomization flows through the exchange component 230. The first-stage end slurry flow channel 231 enters into the second-stage starting slurry flow channel 340 of the second-stage atomizing unit 3, and then enters into the slurry outlet hole 331 from the second-stage starting slurry flow channel 340. At this time, part of the high-temperature steam inside the sleeve 4 enters into the second-stage starting steam flow channel 320 of the second-stage atomizing unit 3 from the first-stage end steam flow channel 232, and then enters into the high-pressure steam outlet hole 332 from the second-stage starting steam flow channel 320. The high-temperature steam and the slurry after the first atomization are mixed and pressurized for the second time at the connection between the high-pressure steam outlet hole 332 and the slurry outlet hole 331, and finally the mixed slurry is sprayed out from the atomizing nozzle 330 at the bottom end.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0038] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A water-coal slurry injection device, characterized in that: It includes a sleeve and a mounting seat, a primary atomization unit and a secondary atomization unit connected in sequence from top to bottom, the primary atomization unit includes a mixing and pressurizing component, an impact component and a flow conversion component connected in sequence, the mounting seat and the flow conversion component are respectively sleeved on the two ends of the sleeve, the mounting seat is provided with a slurry flow hole connected to the mixing and pressurizing component and a plurality of steam flow holes connected to the inside of the sleeve, the mixing and pressurizing component is also connected to the inside of the sleeve; the flow conversion component is provided with a primary end slurry flow channel and a primary end steam flow channel which are staggered and evenly distributed along the circumference, the secondary atomization unit includes a secondary starting slurry flow channel and a secondary starting steam flow channel, the two ends of the primary end slurry flow channel are respectively connected to the end of the mixing and pressurizing component and the secondary starting slurry flow channel, the primary end steam flow channel is respectively connected to the inside of the sleeve and the secondary starting steam flow channel, and a primary wear-resistant part is provided in the mixing and pressurizing component.

2. A water-coal slurry injection device according to claim 1, characterized in that: The slurry circulation hole is coaxially arranged with the mixing and pressurizing component, and the plurality of steam circulation holes are evenly arranged around the slurry circulation hole with the slurry circulation hole as the axis.

3. A water-coal slurry injection device according to claim 1, characterized in that: The mixing and pressurizing component includes a first-level starting slurry flow channel, a first-level pressurizing chamber and an impact chamber which are sequentially connected from top to bottom. The first-level starting slurry flow channel is connected to the slurry flow hole. The first-level pressurizing chamber is evenly distributed along the circumferential direction with a first-level starting steam flow channel connected to the inside of the casing obliquely above the first-level pressurizing chamber.

4. A water-coal slurry injection device according to claim 3, characterized in that: The first-stage starting slurry flow channel, the first-stage starting steam flow channel, the first-stage pressurizing chamber and the inner surfaces of the impact chamber are all provided with first-stage wear-resistant parts, and the first-stage wear-resistant parts are all tubular structures.

5. A water-coal slurry injection device according to claim 3, characterized in that: The impact component is a stepped cylindrical structure, the lower end of the impact component is provided with an external thread, the middle of the commutation component is provided with an external thread, and the impact component is fixed in the impact chamber through a threaded connection.

6. A coal water slurry injection device according to claim 1, characterized in that: The upper and lower ends of the sleeve are provided with internal threads, the mounting seat and the commutation component are provided with external threads, and the mounting seat and the commutation component are respectively fixed to the two ends of the sleeve through threaded connection; the bottom end of the mixing and pressurizing component is provided with external threads, and the upper part of the commutation component is provided with internal threads, and the mixing and pressurizing component is threadedly connected with the commutation component.

7. A coal water slurry injection device according to claim 1, characterized in that: The secondary atomization unit also includes an atomization shell, a wear-resistant collar and a plurality of evenly distributed atomization nozzles coaxially arranged with the secondary starting slurry flow channel. The atomization nozzle is composed of a slurry outlet hole and a high-pressure steam outlet hole arranged crosswise and through-through and forming a Y-shaped structure. The slurry outlet hole is connected to the secondary starting slurry flow channel, and the high-pressure steam outlet hole is connected to the secondary starting steam flow channel.

8. A coal water slurry injection device according to claim 7, characterized in that: The slurry outlet hole intersects with the high-pressure steam outlet hole at an angle of 45°.

9. A coal-water slurry injection device according to claim 8, characterized in that: The slurry outlet hole and the high-pressure steam outlet hole are both provided with secondary wear-resistant parts, and the secondary wear-resistant parts are all countersunk hole tubular structures.

10. A coal water slurry injection device according to claim 7, characterized in that: A step for placing a wear-resistant collar is also provided inside the atomizing housing.

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