Novel boiler separator structure

Abstract

The utility model relates to a boiler separator, in particular to a novel boiler separator structure. A novel boiler separator structure comprises a shell, an inlet is formed in one side of the shell, an air channel entering the shell from the inlet forms a guide plate with the front portion higher than the rear portion, the bottom of the shell is a solid exhaust port, and the upper end of the shell is a gas exhaust port. According to the novel boiler separator structure, the horizontal flue on the side of the target area is made into the gradually-changed shallow U-shaped groove when the structure inclines downwards front, back, left and right, so that circulating material airflow flows towards the side of the target area in the flowing process, and the quantity of materials entering the separator and flowing close to the wall is increased; and the quantity of the materials which are adhered to the wall and sink in advance is increased in the flowing process of the external circulation materials, so that the purposes of increasing the separation efficiency and improving the external circulation quantity are achieved, and better conditions are provided for controlling Nox emission in the on-load interval of the boiler and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler separator especially a novel boiler separator structure. BACKGROUND

[0002] In the process of boiler combustion, the circulating ash amount in the furnace is crucial to improve the load capacity of the boiler, and the circulating material (i.e. flue gas with dust) amount can conduct the heat generated by the coal particle combustion to the water-cooled wall of the furnace, and heat exchange is carried out through the convection heat exchange between the water-cooled wall, so as to meet the demand of the load capacity of the boiler. The lower circulating material amount can cause the higher bed temperature, higher NOx emission, and poor load capacity of the boiler.

[0003] With the rising of coal price, the operating cost of most enterprises begins to rise. In order to reduce the transportation cost, the high-calorie low-ash coal is usually purchased, and the circulating material amount in the furnace is low due to the small amount of ash. In order to improve the separation efficiency of the external circulation, the methods of reducing the inlet width of the separator, reducing the diameter of the center cylinder, and lengthening the center cylinder are usually used. Although these methods can improve the separation efficiency of the external circulation, the inlet width of the separator is limited to 25 m / s (steam cooling type) ~ 30 m / s (adiabatic type); the diameter of the center cylinder is limited to the flow rate of 50 m / s or less in the center cylinder; and the lengthening of the center cylinder can greatly increase the resistance, and the increased resistance is much less than the improved furnace differential pressure. After using these methods, the resistance of the separator is increased, and the power consumption of the induced draft fan is also increased after the resistance is increased, which is not conducive to energy saving and emission reduction.

[0004] The horizontal flue of the inlet of the original designed separator is in a horizontal state, and after a period of operation, the downflow of the airflow always leaves the traces of the downflow in the target area position of the separator. In order to cut the circle between the horizontal flue of the separator and the circular cylinder of the separator, there is always a triangular area after entering the separator. This area controls the descending position and descending time of the circulating material amount in the separator. Some circulating fluidized bed boilers with large circulating amount start to downwash when the airflow leaves the triangular area, and when the bottom triangular area is encountered, the back-impact phenomenon of the circulating material is formed, so that the circulating material amount in the furnace continues to rise. The position close to the center cylinder side can bring the circulating material into the tail flue, causing the problems of high exhaust gas temperature and the like.

[0005] In view of the above defects, the present design person actively researches and innovates, so as to create a novel boiler separator structure, so that it has more industrial utilization value. CONTENT OF THE UTILITY MODEL

[0006] In order to solve the above technical problems, the utility model aims at providing a novel boiler separator structure.

[0007] The utility model discloses a novel boiler separator structure, including the shell, the side of shell is opened with the entrance, the guide plate of the front high rear low is formed to the air channel of the entrance into the shell, and the bottom of shell is solid discharge port, and the upper end is gas discharge port.

[0008] The guide plate between the entrance and the shell of the novel boiler separator structure is a guide plate structure with the front high rear low, and the flue gas with dust flows into the separator after passing through the guide plate, so that the airflow can be separated from the center of the separator, and the separation effect is improved.

[0009] Further, the expansion joint is installed between the entrance and the shell.

[0010] The expansion joint between the entrance and the shell is used to adjust the relative position of the entrance, which is convenient to use.

[0011] Further, the height of the position where the entrance and the shell meet is H, and the height of the entrance after extending into the shell is H+400mm.

[0012] The connecting plate between the entrance and the guide plate has a height difference, which is convenient for airflow guiding.

[0013] Further, the guide plate between the bottom of the entrance and the shell has four end points, and the entering point of the straight wall is taken as the reference point, the end point of the straight wall and the end point of the inclined wall are lower than the reference point, and the entering point of the inclined wall is higher than the reference point.

[0014] The four end points of the guide plate have different heights, so that the external circulating material in the circulating fluidized bed is guided to the tangent circle side, and after the dust flue gas is guided, most of the dust flue gas is away from the position of the central cylinder, and a large amount of dust is captured after entering the separator.

[0015] Further, the end point of the straight wall of the entrance is the lowest.

[0016] The left upper end point is also the lowest, which is convenient for the airflow to flow to the inner wall of the shell and improves the separation efficiency.

[0017] Further, the height of the entering point of the straight wall is 0, the height of the end point of the straight wall is -400mm, the height of the end point of the inclined wall is -300mm, and the height of the entering point of the inclined wall is +100mm.

[0018] Through such a setting mode, the guiding effect of the guide plate is better.

[0019] By the above scheme, the application has at least the following advantages: the new boiler separator structure is inclined left and right, and the horizontal flue on the target area side is made into a gradually shallow U-shaped groove, so that the circulating material gas flow flows to the target area side in the flow process, increasing the amount of wall-attached material entering the separator. The outer circulating material increases the amount of wall-attached and early-sinking material in the flow process, thereby achieving the purpose of increasing the separation efficiency and improving the outer circulation amount, and providing better conditions for boiler load control Nox emission, etc.

[0020] Due to the use of the structure sinking at the position of the separator, the width of the separator inlet is correspondingly reduced, and after increasing the separation efficiency, the center cylinder length can be shortened in design when the required furnace differential pressure for combustion is reached, and the flow velocity in the center cylinder is controlled not to exceed the limit, which also brings certain benefits to the control of the tail negative pressure and the power consumption of the induced draft fan.

[0021] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiment of the present application and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show a certain embodiment of the present application, therefore should not be regarded as a limitation on the scope, for those skilled in the art, without creative labor, other related drawings can also be obtained according to these drawings.

[0023] Figure 1 is the front view of the present application;

[0024] Figure 2 is the A-A sectional view of the drawing of the present application;

[0025] In the figure, 1 is an outer shell, 2 is an inlet, 3 is a solid discharge port, 4 is a gas discharge port, and 5 is an expansion joint. DETAILED DESCRIPTION

[0026] The specific implementation of the present application will be further described in detail in combination with the drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0027] Referring to Figure 1 and Figure 2The new boiler separator structure, the inside wall of the shell 1 is wrapped with a circulating fluidized bed, one end of the shell 1 has a flue gas inlet 2, and a flue gas guide is arranged at the rear end of the inlet for guiding the flue gas to facilitate the adhesion of the flue gas to the shell 1, thereby improving the separation efficiency of the dust in the flue gas, and the separated gas is discharged from the gas outlet 4 at the upper end, and the dust is discharged from the solid outlet 3 at the lower end.

[0028] An expansion joint 5 is arranged between the inlet 2 and the shell 1, so as to facilitate the adjustment of the position of the inlet 2 and facilitate use.

[0029] The guide plate formed between the inlet 2 and the shell 1 has a drop of 50-400mm between the front end and the rear end, so that the external circulating material in the circulating fluidized bed is guided to the tangent circle side, and after the circulating material is guided, most of the circulating material is away from the position of the central cylinder, and after entering the separator, a large amount of circulating material is captured, thereby improving the separation efficiency.

[0030] The four end points of the guide plate are different in height, and the end point of the straight wall and the end point of the inclined wall are lower than the reference point, and the entering point of the inclined wall is higher than the reference point.

[0031] The straight wall is Figure 2 The wall plate on the middle A side is Figure 2 The wall plate on the middle B side is.

[0032] And the height of the entering point of the straight wall is 0, the height of the end point of the straight wall is -400mm, the end point of the inclined wall is -300mm, and the height of the entering point of the inclined wall is +100mm.

[0033] The guide plate is made into a gradually shallow U-shaped groove, so that the circulating material gas flow flows to the target area side in the flowing process, and the amount of material entering the separator wall flow is increased. The amount of material in the wall flow and early sinking is increased in the flowing process of the external circulating material, so as to increase the separation efficiency and increase the external circulating amount, and provide better conditions for the control of Nox emission during the load of the boiler.

[0034] Finally, it should be pointed out that: first of all, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0035] Secondly: the utility model discloses the embodiment in the drawing, only relates to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, in the case of no conflict, the same embodiment and different embodiments of the utility model can be combined with each other.

[0036] Finally: the above only preferred embodiments of the present application, and is not intended to limit the present application, should be noted that for those skilled in the ordinary technical personnel in the art, without departing from the technical principles of the present application, under the premise that a number of improvements and modifications can also be made, these improvements and modifications should be considered as the scope of the present application.

Claims

1. A novel boiler separator structure, comprising a shell (1), characterized in that: The inner wall of the outer shell (1) is covered with a circulating fluidized bed. An inlet (2) is opened on one side of the outer shell (1). The air duct inside the outer shell (1) forms a guide plate that is high in the front and low in the back. The bottom of the outer shell (1) is a solid outlet (3) and the top is a gas outlet (4).

2. The novel boiler separator structure according to claim 1, characterized in that: An expansion joint (5) is installed between the inlet (2) and the outer shell (1).

3. The novel boiler separator structure according to claim 2, characterized in that: The height of the junction between the inlet (2) and the outer shell (1) is H, and the height of the inlet (2) extending into the inner side of the outer shell (1) is H+400mm.

4. The novel boiler separator structure according to claim 3, characterized in that: The guide plate between the bottom of the entrance (2) and the shell (1) has four endpoints, with the entry point of the straight wall as the reference point, the end point of the straight wall and the end point of the inclined wall being lower than the reference point, and the entry point of the inclined wall being higher than the reference point.

5. The novel boiler separator structure according to claim 4, characterized in that: The end point of the straight wall at the entrance (2) has the lowest height.

6. The novel boiler separator structure according to claim 5, characterized in that: The height of the entry point of the straight wall is 0 mm, the height of the end point of the straight wall is -400 mm, the height of the end point of the inclined wall is -300 mm, and the height of the entry point of the inclined wall is +100 mm.

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