Black liquor filtering device for wood pulp production

Abstract

The utility model relates to a waste liquid treatment technology in wood pulp production, and discloses a black liquor filtering device for wood pulp production. The utility model discloses a black liquor filtering device for wood pulp production. The black liquor filtering device comprises a body, a cover body and a filtering piece, wherein the body is provided with an accommodating cavity, a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are respectively communicated with the accommodating cavity; the cover body covers the body; the filtering piece is arranged in the containing cavity and used for filtering the black liquor flowing through the containing cavity, the filtering piece comprises a first filtering part and a second filtering part, and the first filtering part and the second filtering part define a hollow structure. The black liquor filtering device used in wood pulp production is connected between the high-concentration tank and the waste liquor spray gun, black liquor in the high-concentration tank flows into the containing cavity through the liquor inlet pipe under the action of the pump, and the black liquor in the containing cavity flows into the waste liquor spray gun through the liquor outlet pipe after being filtered twice through the first filtering part and the second filtering part. Therefore, the nozzle of the waste liquid spray gun is prevented from being blocked.

Description

TECHNICAL FIELD

[0001] The utility model relates to wood pulp production in waste liquid treatment technology especially relates to a black liquor filter device for wood pulp production in. BACKGROUND

[0002] In the wood pulp production process, the alkali recovery evaporation section concentrates the 1.5% dilute black liquor produced in pulping into 65% concentration black liquor and transfers into high concentration tank for storage. The main components of black liquor are flammable, such as Figure 1 As shown in the figure, in order to treat the black liquor in high concentration tank 1, a pipeline and a pump are generally used to connect high concentration tank 1 and waste liquid spray gun 2 arranged in the alkali furnace, and waste liquid spray gun 2 sprays black liquor into the alkali furnace for combustion. However, due to the small aperture of the gun head and the rotating flow piece of waste liquid spray gun 2, the impurities (inorganic salt, lignin, hemicellulose, etc.) in black liquor often block the gun head of waste liquid spray gun 2, which causes the load of the alkali furnace to drop sharply, the combustion to be unstable, the flue gas to be uncontrollable, and the flue gas to exceed the standard.

[0003] Therefore, there is an urgent need for a black liquor filter device for wood pulp production to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a black liquor filter device for wood pulp production, which can solve the problem that the gun head of the waste liquid spray gun 2 and the rotating flow piece have a small aperture, the impurities in the black liquor often block the gun head of the waste liquid spray gun 2, the load of the alkali furnace drops sharply, the combustion is unstable, the flue gas is uncontrollable, and the flue gas exceeds the standard.

[0005] To achieve this purpose, the utility model adopts the following technical scheme: a black liquor filter device for wood pulp production, comprising

[0006] A body is provided with a containing cavity, a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are respectively connected with the containing cavity;

[0007] A cover is arranged on the body to form a relatively closed space in the containing cavity;

[0008] A filter element is arranged in the containing cavity to filter the black liquor flowing through the containing cavity, and the filter element comprises a first filter part and a second filter part, and the first filter part and the second filter part form a hollow structure.

[0009] As an optional scheme, the first filter part is planar, the second filter part is arc-shaped, the two ends of the first filter part are respectively connected with the two ends of the second filter part, and the poles of the second filter part have a spacing from the first filter part.

[0010] As an optional solution, the first filter part and the second filter part are provided with filter holes.

[0011] As an optional solution, the filter holes are circular, and the diameter of the filter holes is not greater than 1mm.

[0012] As an optional solution, the filter part further comprises a first fixing part and a second fixing part, the first fixing part and the second fixing part are respectively arranged at two ends of the first filter part, and the first fixing part and the second fixing part are parallel to each other.

[0013] As an optional solution, the first fixing part is provided with a holding part.

[0014] As an optional solution, the accommodating cavity is internally provided with a clamping part, and when the filter part is placed in the accommodating cavity, the filter part is at least partially clamped in the clamping part.

[0015] As an optional solution, the clamping part comprises a first clamping part and a second clamping part connected with the first clamping part, the first clamping part and the second clamping part form a first angle, the first filter part and the second filter part form a second angle, and the first angle matches the second angle.

[0016] As an optional solution, the body is provided with a supporting part on the end face adjacent to the ground, and the supporting part is used for supporting the body.

[0017] As an optional solution, the body is further provided with a liquid discharge pipe at the end adjacent to the ground, and the liquid discharge pipe is used for discharging the dirty liquid in the accommodating cavity.

[0018] The black liquid in the high concentration tank flows into the accommodating cavity through the liquid inlet pipe under the action of the pump, the black liquid in the accommodating cavity is filtered twice by the first filter part and the second filter part, and then flows into the waste liquid spray gun through the liquid outlet pipe, so that the clogging phenomenon of the spray head of the waste liquid spray gun is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment of the utility model will be simply introduced below.

[0020] Figure 1 It is a schematic diagram of the treatment of the black liquid in the wood pulp production in the prior art;

[0021] Figure 2 It is a schematic diagram of the treatment of the black liquid in the wood pulp production in the utility model;

[0022] Figure 3 A schematic diagram of a black liquor filtration device for wood pulp production provided in this embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of a black liquor filtration device (with cap removal) for wood pulp production provided in this utility model embodiment;

[0024] Figure 5 A schematic diagram of the main body structure provided for an embodiment of this utility model;

[0025] Figure 6 A schematic diagram of the filter element structure provided in this embodiment of the utility model;

[0026] Figure 7 This is a structural schematic diagram of the filter element provided in this embodiment of the utility model from another angle.

[0027] Figure label:

[0028] 1. High-concentration tank; 2. Waste liquid spray gun; 3. Black liquor filtration device for wood pulp production; 31. Body; 311. Inlet pipe; 312. Outlet pipe; 313. First steam pipe; 314. Second steam pipe; 315. Support; 316. Drain pipe; 32. Cover; 33. Filter element; 331. First filter part; 332. Second filter part; 333. First fixing part; 334. Second fixing part; 335. Holding part; 34. Snap-fit ​​part; 341. First snap-fit ​​part; 342. Second snap-fit ​​part. Detailed Implementation

[0029] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0030] In the prior art, in order to treat the black liquor in the high concentration tank 1, the high concentration tank 1 is generally connected to the waste liquid spray gun 2 set in the alkali furnace by a pipeline and pump. The waste liquid spray gun 2 sprays the black liquor into the alkali furnace for combustion. However, due to the small diameter of the nozzle and swirl vane of the waste liquid spray gun 2, the impurities in the black liquor often clog the nozzle of the waste liquid spray gun 2. This causes the load of the alkali furnace to drop sharply, the combustion to be unstable, and the flue gas to be uncontrollable, resulting in the flue gas exceeding the standard.

[0031] Therefore, such as Figures 3 to 7 As shown in the figure, an embodiment of the present invention provides a black liquor filtration device for wood pulp production to solve the above-mentioned technical problems.

[0032] Specifically, such as Figures 3 to 4As shown in the drawings, a black liquor filtering device 3 for wood pulp production includes a body 31, a cover 32, and a filter 33. The body 31 has a receiving cavity, an inlet pipe 311, and an outlet pipe 312, and the inlet pipe 311 and the outlet pipe 312 are respectively connected to the receiving cavity. The cover 32 is arranged on the body 31 to form a relatively closed space in the receiving cavity. The cover 32 and the body 31 are respectively provided with threaded holes, and the cover 32 and the body 31 are fixedly connected by bolts. The filter 33 is arranged in the receiving cavity to filter the black liquor flowing through the receiving cavity. The filter 33 includes a first filter part 331 and a second filter part 332, and the first filter part 331 and the second filter part 332 form a hollow structure. Figure 2 As shown in the drawings, the black liquor filtering device 3 for wood pulp production is connected between a high-concentration tank 1 and a waste liquid spray gun 2. The black liquor in the high-concentration tank 1 flows into the receiving cavity through the inlet pipe 311 under the action of a pump. After being filtered twice by the first filter part 331 and the second filter part 332 in the receiving cavity, the black liquor flows into the waste liquid spray gun 2 through the outlet pipe 312, thereby avoiding the clogging of the spray head of the waste liquid spray gun 2.

[0033] In some embodiments, as shown in the drawings, Figure 4 , Figure 6 and Figure 7 the body 31 is cylindrical. To increase the effective filtering area and filtering effect of the filter 33, the first filter part 331 is planar, the width of the first filter part 331 is equal to the inner diameter of the body 31, the length of the first filter part 331 is equal to the length of the inside of the body 31, the second filter part 332 is arc-shaped, the two ends of the first filter part 331 are respectively connected to the two ends of the second filter part 332, the poles of the second filter part 332 have a spacing from the first filter part 331, and the arc surface of the second filter part 332 has a spacing from the inner wall of the receiving cavity.

[0034] In some embodiments, the first filter part 331 and the second filter part 332 are respectively provided with filter holes. The filter holes are circular, and the diameter of the filter holes is not greater than 7.5 mm. In this way, the black liquor flowing through the filter 33 can not cause the clogging of the spray head of the waste liquid spray gun 2.

[0035] In some embodiments, to enhance the firmness of the first filter part 331 and the second filter part 332, the filter 33 further includes a first fixing part 333 and a second fixing part 334. The first fixing part 333 and the second fixing part 334 are respectively connected to the two ends of the first filter part 331 and the second filter part 332, and the first fixing part 333 and the second fixing part 334 are parallel to each other. The first filter part 331, the second filter part 332, the first fixing part 333, and the second fixing part 334 form a hollow structure.

[0036] In some embodiments, in order to facilitate the placement of the filter element 33 in the containing cavity or the removal of the filter element 33 from the containing cavity, a gripping member 335 is arranged on the first fixing portion 333, and the gripping member 335 can be in a U shape.

[0037] In some embodiments, in order to facilitate the fixed installation of the filter element 33 in the containing cavity, a clamping member 34 is arranged on the surface of the body 31 facing the interior of the containing cavity, and when the filter element 33 is placed in the portion of the containing cavity, the filter element 33 is at least partially clamped in the clamping member 34.

[0038] In some embodiments, the clamping member 34 comprises a first clamping portion 341 and a second clamping portion 342 connected with the first clamping portion 341, the first clamping portion 341 and the second clamping portion 342 form a first angle, the first filter portion 331 and the second filter portion 332 form a second angle, and the first angle matches the second angle, so that the filter element 33 can be clamped in the clamping member 34.

[0039] In some embodiments, a support member 315 is arranged on the end surface of the body 31 adjacent to the ground, the support member 315 can stably place the body 31 on the ground, and the support member 315 is made of triangular angle iron.

[0040] In some embodiments, in order to facilitate the maintenance of the filter element 3, the liquid inlet pipe 311 can be provided with a first steam pipe 313 in communication with the liquid inlet pipe 311, and the liquid outlet pipe 312 is provided with a second steam pipe 314 in communication with the liquid outlet pipe 312, when the filter element 3 needs to be maintained, steam is introduced into the filter element 3 through the first steam pipe 313 and the second steam pipe 314, and the filter element 3 is cleaned by using the steam, of course, hot water can also be introduced into the containing cavity through the liquid inlet pipe 311 and the liquid outlet pipe 312, and the filter element 3 and the containing cavity are cleaned by using the hot water, and the end of the body 31 adjacent to the ground is also provided with a liquid discharge pipe 316, which is used to discharge the liquid generated in the cleaning of the filter element 3 and the containing cavity.

[0041] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection range of the present application.

Claims

1. A black liquor filtering device (3) used in wood pulp production, characterized in that, The utility model relates to a black liquor filtering device, which comprises a body (31) provided with a containing cavity, a liquid inlet pipe (311) and a liquid outlet pipe (312) respectively communicating with the containing cavity. A cover (32) is arranged on the body (31) to form a relatively closed space in the containing cavity. A filtering element (33) is arranged in the containing cavity to filter the black liquor flowing through the containing cavity, and the filtering element (33) comprises a first filtering part (331) and a second filtering part (332), and the first filtering part (331) and the second filtering part (332) form a hollow structure. The first filtering part (331) is planar, the second filtering part (332) is arc-shaped, the two ends of the first filtering part (331) are connected to the two ends of the second filtering part (332) respectively, and the poles of the second filtering part (332) have a spacing from the first filtering part (331).

2. A black liquor filtering device (3) for use in wood pulp production according to claim 1, characterized in that, Filtering holes are arranged on the first filtering part (331) and the second filtering part (332).

3. A black liquor filtering device (3) for use in wood pulp production according to claim 2, characterized in that The filtering holes are circular, and the diameter of the filtering holes is not greater than 7.5 mm.

4. A black liquor filtering device (3) for use in wood pulp production according to claim 3, characterized in that The filtering element (33) further comprises a first fixing part (333) and a second fixing part (334), the first fixing part (333) and the second fixing part (334) are arranged at the two ends of the first filtering part (331) respectively, and the first fixing part (333) and the second fixing part (334) are parallel to each other.

5. A black liquor filtering device (3) for use in wood pulp production according to claim 1, characterized in that, A holding part (335) is arranged on the first fixing part (333).

6. A black liquor filtering device (3) for use in wood pulp production according to claim 5, characterized in that A clamping part (34) is arranged inside the containing cavity, and when the filtering element (33) is placed in the containing cavity, the filtering element (33) is at least partially clamped in the clamping part (34).

7. A black liquor filtering device (3) for use in wood pulp production according to claim 1, characterized in that, The clamping part (34) comprises a first clamping part (341) and a second clamping part (342) connected to the first clamping part (341), the first clamping part (341) and the second clamping part (342) form a first angle, the first filtering part (331) and the second filtering part (332) form a second angle, and the first angle matches the second angle.

8. A black liquor filtering device (3) for use in wood pulp production according to claim 7, characterized in that A support (315) is arranged on the end face of the body (31) adjacent to the ground, and the support (315) is used for supporting the body (31).

9. A black liquor filtering device (3) for use in wood pulp production according to any of claims 1 - 8, characterized in that, A liquid discharge pipe (316) is further arranged on the end of the body (31) adjacent to the ground, and the liquid discharge pipe (316) is used for discharging the contaminated liquid in the containing cavity.

10. A black liquor filtering device (3) for use in wood pulp production according to any of claims 1 - 8, characterized in that, ​

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