Flow-controllable pulverized coal distributor

Abstract

The embodiment of the utility model provides a flow-controllable pulverized coal distributor which is arranged at an outlet of a pulverized coal separator of a coal mill and comprises a special-shaped connecting piece, a mixing bin, a plurality of flow distribution adjusting mechanisms and a plurality of square and round joints. The special-shaped connecting piece is provided with a plurality of inlets, and each inlet is used for being communicated with an outlet of a pulverized coal separator of a corresponding coal mill. An inlet of the mixing bin is communicated with an outlet of the special-shaped connecting piece, and an outlet of the mixing bin is communicated with an inlet of the corresponding flow distribution adjusting mechanism. Inlets of the multiple square and round joints are communicated with outlets of the corresponding flow distribution adjusting mechanisms, and outlets of the multiple square and round joints are used for being communicated with corresponding powder feeding pipes. The problems that an existing pulverized coal distributor is poor in adjusting performance, too large in size and the like are solved, the distribution uniformity of pulverized coal airflow flow in all powder feeding pipes at an outlet of a coal mill is improved, and therefore the combustion stability in a boiler and the uniformity of temperature distribution in the boiler are improved.

Description

Technical Field

[0001] The disclosed embodiments belong to the technical field of air duct modification, and particularly relate to a flow-controllable pulverized coal distributor. Background Art

[0002] The pulverizing system is an essential component of a pulverized coal boiler system. The medium-speed mill direct-blowing pulverizing system is a common and widely adopted pulverizing system for power plant coal-fired boilers. The system's operational status significantly impacts the proper functioning of coal-fired boilers. Flow deviation between the various pulverized coal delivery pipes in the pulverizing system is a critical parameter for the operation of the medium-speed mill direct-blowing pulverizing system. Uneven flow distribution between pulverized coal pipes often leads to a range of problems within the boiler furnace, including unstable combustion, large thermal load deviations, and localized high-temperature corrosion.

[0003] Existing pulverized coal distributors generally have problems such as unadjustable flow, poor distribution performance, large size, easy wear and inconvenient maintenance. They are difficult to meet the current requirements of high-parameter coal-fired boilers for compact layout structure and efficient and stable combustion.

[0004] In view of the above problems, it is necessary to propose a flow-controllable pulverized coal distributor with a reasonable design that effectively solves the above problems. Utility Model Content

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a pulverized coal distributor with controllable flow.

[0006] The embodiment of the present disclosure provides a flow-controllable pulverized coal distributor, which is arranged at the outlet of the pulverized coal separator of the coal mill and includes a special-shaped connector, a mixing chamber, multiple flow distribution adjustment mechanisms, and multiple square and round sections;

[0007] The special-shaped connecting piece has a plurality of inlets, each inlet being connected to its corresponding outlet of the coal mill pulverized coal separator;

[0008] The inlet of the mixing chamber is connected to the outlet of the special-shaped connecting piece, and the outlet of the mixing chamber is connected to the inlet of the corresponding flow distribution and adjustment mechanism;

[0009] The inlets of the plurality of square and round sections are connected to the outlets of the corresponding flow distribution and adjustment mechanisms, and the outlets of the plurality of square and round sections are used to be connected to the corresponding powder delivery pipes.

[0010] Optionally, the flow distribution and adjustment mechanism includes a housing, a flow adjustment plate and a flow adjustment shaft;

[0011] The bottom wall of the shell is connected to the mixing chamber, and the top wall of the shell is connected to the square and circular section;

[0012] The flow regulating shaft passes through the side wall of the housing and extends out of the side wall of the housing;

[0013] The flow regulating plate is arranged in the housing and connected to the flow regulating shaft; wherein,

[0014] When the flow regulating plate rotates, the angle between the flow regulating plate and the flow channel cross section changes, so as to regulate the flow of the pulverized coal entering the powder feeding pipe.

[0015] Optionally, the flow distribution and adjustment mechanism further includes a sealing seat;

[0016] The sealing seat is sleeved on the end of the flow regulating shaft and fixed to the side wall of the shell.

[0017] Optionally, the flow distribution and adjustment mechanism further includes a flow adjustment handle;

[0018] The first end of the flow regulating handle is connected to the end of the flow regulating shaft.

[0019] Optionally, the flow distribution and adjustment mechanism further includes a handle fixing frame, and the handle fixing frame is provided on the side wall of the housing;

[0020] The handle fixing frame is provided with a slide groove, and the second end of the flow regulating handle is slidably arranged in the slide groove.

[0021] Optionally, each of the flow distribution and adjustment mechanisms includes two flow adjustment plates and two flow adjustment shafts.

[0022] Optionally, the mixing chamber is a square ring structure.

[0023] Optionally, a plurality of the flow distribution and adjustment mechanisms are distributed and arranged at intervals around the center of the mixing bin.

[0024] Optionally, the plurality of flow distribution and adjustment mechanisms are symmetrically distributed.

[0025] Optionally, the number of the flow distribution and adjustment mechanisms is 8, the number of the square and circle nodes is 8, the special-shaped connecting piece has 8 inlets, and the mixing chamber has 8 outlets.

[0026] The flow controllable pulverized coal distributor of the embodiment of the present disclosure changes the actual control area of ​​the pulverized coal delivery pipe inlet by setting a flow regulating and distributing mechanism to adjust the deviation of the pulverized coal airflow flow between each pulverized coal delivery pipe, so that the deviation of the pulverized coal airflow flow between each pulverized coal delivery pipe is within ±

[0027] The pulverized coal distributor is compact and occupies little space, making it easy to modify and maintain. It meets the current demands of high-performance coal-fired boilers for compact structure and efficient and stable combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of a flow-controllable pulverized coal distributor according to one embodiment of the present disclosure;

[0029] Figure 2 for Figure 1 A top view of a flow-controllable pulverized coal distributor;

[0030] Figure 3 for Figure 1 A front view of a flow-controllable pulverized coal distributor;

[0031] Figure 4 It is a front view of the flow distribution adjustment mechanism in an embodiment of the present disclosure;

[0032] Figure 5 It is a right side view of the flow distribution adjustment mechanism in the embodiment of the present disclosure;

[0033] Figure 6 A top view of the flow distribution and adjustment mechanism in an embodiment of the present disclosure;

[0034] Figure 7 is a top view of a special-shaped connector in an embodiment of the present disclosure;

[0035] Figure 8 It is a front view of the special-shaped connecting piece in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] like Figures 1 to 3 As shown, an embodiment of the present disclosure provides a flow-controllable pulverized coal distributor 100 , which is arranged at the outlet of the pulverized coal separator of the coal mill, and includes a special-shaped connecting piece 110 , a mixing bin 120 , a plurality of flow distribution adjustment mechanisms 130 and a plurality of square and round sections 140 .

[0038] The special-shaped connector 110 has multiple inlets, each of which is connected to its corresponding coal mill coal powder separator outlet. The special-shaped connector 110 plays the role of a transition connection, and is suitable for realizing the shape of the coal mill coal powder separator outlet and the inlet shape of the mixing bin 120 respectively.

[0039] The inlet of the mixing chamber 120 is connected to the outlet of the special-shaped connecting piece 110 , and the outlet of the mixing chamber 120 is connected to the inlet of the corresponding flow distribution and adjustment mechanism 130 .

[0040] The inlets of the plurality of square and round sections 140 are connected to the outlets of the corresponding flow distribution and adjustment mechanisms 130 , and the outlets of the plurality of square and round sections 140 are used to be connected to the corresponding powder delivery pipes.

[0041] In this embodiment, if Figure 1 and Figure 2 As shown, there are eight flow distribution and adjustment mechanisms 130, eight square and round sections 140, eight special-shaped connectors 110 and eight outlets in the mixing chamber 120. That is, in this embodiment, a one-to-eight type pulverized coal distributor is used as an example for description.

[0042] Specifically, the pulverized coal airflow passes through the eight outlets of the pulverized coal separator of the coal mill and enters the special-shaped connector 110 through the corresponding inlets of the special-shaped connector 110, ensuring uniform distribution of the pulverized coal airflow upon entering the mixing chamber 120. The pulverized coal airflow entering the special-shaped connector 110 enters the mixing chamber 120 through its inlets and is uniformly mixed there. The evenly mixed pulverized coal airflow enters each of the eight flow distribution and adjustment mechanisms 130. Each flow distribution and adjustment mechanism 130 changes the actual control area of ​​the pulverized coal flow channel to control the flow rate of the pulverized coal airflow. The eight square and circular sections 140 guide the flow-regulated pulverized coal airflow into the eight pulverized coal delivery pipes, ensuring uniform flow distribution within each pulverized coal delivery pipe.

[0043] The flow-controllable pulverized coal distributor of the disclosed embodiment changes the actual control area of ​​the powder delivery pipe inlet by setting a flow regulating and distributing mechanism to adjust the deviation of the pulverized coal airflow flow rate between each powder delivery pipe, so that the deviation of the pulverized coal airflow flow rate between each powder delivery pipe is within ±10%, thereby achieving the purpose of adjusting the combustion in the boiler and effectively reducing the problem of local high-temperature corrosion caused by the thermal load deviation in the furnace. At the same time, in view of the limited space conditions for the layout of the pulverizing system of some coal-fired power plants, the pulverized coal distributor has a compact structure, occupies a small space, and is convenient for modification and layout. It solves the problems of poor regulating performance and excessive volume existing in the existing pulverized coal distributor, improves the uniformity of the pulverized coal airflow flow distribution in each powder delivery pipe at the outlet of the pulverizer, thereby improving the combustion stability in the boiler and the uniformity of the temperature distribution in the furnace.

[0044] For example, Figures 4 to 6As shown, the flow distribution and adjustment mechanism 130 includes a housing 131 , a flow adjustment shaft 132 and a flow adjustment plate 133 .

[0045] The bottom wall of the shell 131 is connected to the mixing chamber 120, and the top wall of the shell 131 is connected to the square section 140. The cross section of the shell 131 is square.

[0046] The flow regulating shaft 132 passes through the side wall of the housing 131 and extends out of the side wall of the housing 131 .

[0047] The flow regulating plate 133 is arranged in the shell and is connected to the flow regulating shaft 132; wherein, the rotation of the flow regulating shaft 132 drives the flow regulating plate 133 to rotate. When the flow regulating plate 133 rotates, the angle between the flow regulating plate 133 and the flow channel cross section changes, and the actual area of ​​the flow channel is controlled to adjust the flow of the coal powder airflow entering the powder delivery pipe.

[0048] Specifically, in this embodiment, each flow distribution and adjustment mechanism 130 includes two flow adjustment plates 133 and two flow adjustment shafts 132. The angle between the flow adjustment baffle 133 and the flow channel cross section can be changed by rotating the two flow adjustment shafts 132.

[0049] For example, Figure 4 and Figure 6 As shown, the flow distribution and adjustment mechanism 130 further includes a sealing seat 134; the sealing seat 134 is mounted on the end of the flow adjustment shaft 132 and fixed to the side wall of the housing 131. The sealing seat 134 prevents dust from entering the flow adjustment shaft 132, which could cause the lubricating oil to deteriorate in quality and cause wear on the flow adjustment shaft 132 itself.

[0050] Exemplarily, the flow distribution adjustment mechanism 130 further includes a flow adjustment handle 135, a first end of which is connected to the end of the flow adjustment shaft 132. By controlling the rotation of the flow adjustment handle 135, the flow adjustment shaft 132 is controlled to rotate, and the flow adjustment handle 135 is used to more conveniently rotate the flow adjustment shaft 132.

[0051] For example, Figure 4 and 5 As shown, the flow distribution and adjustment mechanism 130 further includes a handle mounting bracket 136, which is disposed on a side wall of the housing 131. The handle mounting bracket 136 is provided with a slide groove 137, into which the second end of the flow adjustment handle 135 is slidably mounted via a bolt. The slide groove 137 is a curved groove, and the handle mounting bracket 136 can be used to control the rotational angle range of the flow adjustment handle 135, thereby controlling the angle range between the flow adjustment baffle 133 and the flow channel cross section.

[0052] For example, Figure 2 As shown, the mixing bin 120 is a square ring structure. The coal drop pipe of the coal mill will pass through the gap in the middle of the mixing bin 120.

[0053] For example, Figure 2 As shown, a plurality of flow distribution and adjustment mechanisms 130 are arranged at intervals around the center of the mixing chamber. Specifically, eight flow distribution and adjustment mechanisms 130 are arranged at intervals around the center of the mixing chamber.

[0054] Preferably, in this embodiment, the plurality of flow distribution and adjustment mechanisms 130 are symmetrically distributed. Specifically, eight flow distribution and adjustment mechanisms 130 are symmetrically distributed, with two flow distribution and adjustment mechanisms 130 disposed on each side of the mixing chamber 120 .

[0055] For example, Figure 7 and Figure 8 As shown, the special-shaped connector 110 is composed of eight identical units A, with a square top cross-section and eight circular sections arranged in a ring at the bottom. The eight circular inlets of the special-shaped connector 110 match the shape of the outlet of the coal mill's pulverized coal separator, while the square outlet of the special-shaped connector 110 matches the shape of the inlet of the mixing bin 120.

[0056] For example, Figure 1 As shown, the bottom cross-section of the square section 140 is square, matching the shape of the housing 131 of the flow distribution and adjustment mechanism 130. The top cross-section of the square section 140 is circular, matching the shape of the powder feeding pipe. The square section 140 serves as a transition connection.

[0057] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and essence of the embodiments of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the embodiments of the present disclosure.

Claims

1. A flow-controllable pulverized coal distributor, which is arranged at the outlet of the pulverized coal separator of a coal mill, characterized in that: It includes special-shaped connectors, a mixing chamber, multiple flow distribution and adjustment mechanisms, and multiple square and round sections; The special-shaped connecting piece has a plurality of inlets, each inlet being connected to its corresponding outlet of the coal mill pulverized coal separator; The inlet of the mixing chamber is connected to the outlet of the special-shaped connecting piece, and the outlet of the mixing chamber is connected to the inlet of the corresponding flow distribution and adjustment mechanism; The inlets of the plurality of square and round sections are connected to the outlets of the corresponding flow distribution and adjustment mechanisms, and the outlets of the plurality of square and round sections are used to be connected to the corresponding powder delivery pipes.

2. The pulverized coal distributor according to claim 1, characterized in that: The flow distribution and adjustment mechanism includes a housing, a flow adjustment plate and a flow adjustment shaft; The bottom wall of the shell is connected to the mixing chamber, and the top wall of the shell is connected to the square and circular section; The flow regulating shaft passes through the side wall of the housing and extends out of the side wall of the housing; The flow regulating plate is arranged in the housing and connected to the flow regulating shaft; wherein, When the flow regulating plate rotates, the angle between the flow regulating plate and the flow channel cross section changes, so as to regulate the flow of the pulverized coal entering the powder feeding pipe.

3. The pulverized coal distributor according to claim 2, characterized in that: The flow distribution and adjustment mechanism further includes a sealing seat; The sealing seat is sleeved on the end of the flow regulating shaft and fixed to the side wall of the shell.

4. The pulverized coal distributor according to claim 2, characterized in that: The flow distribution and adjustment mechanism also includes a flow adjustment handle; The first end of the flow regulating handle is connected to the end of the flow regulating shaft.

5. The pulverized coal distributor according to claim 4, characterized in that: The flow distribution and adjustment mechanism further includes a handle fixing frame, and the handle fixing frame is arranged on the side wall of the housing; The handle fixing frame is provided with a slide groove, and the second end of the flow regulating handle is slidably arranged in the slide groove.

6. The pulverized coal distributor according to claim 2, characterized in that: Each of the flow distribution and adjustment mechanisms includes two flow adjustment plates and two flow adjustment shafts.

7. The pulverized coal distributor according to any one of claims 1 to 6, characterized in that: The mixing bin is in a square ring structure.

8. The pulverized coal distributor according to claim 7, characterized in that: A plurality of flow distribution and adjustment mechanisms are distributed and arranged at intervals around the center of the mixing chamber.

9. The pulverized coal distributor according to claim 8, characterized in that The plurality of flow distribution and adjustment mechanisms are symmetrically distributed.

10. The pulverized coal distributor according to any one of claims 1 to 6, characterized in that: The number of the flow distribution and adjustment mechanisms is 8, the number of the square and circle nodes is 8, the special-shaped connecting piece has 8 inlets, and the mixing chamber has 8 outlets.

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