Double-layer vertical black liquor heater

Abstract

The utility model discloses a double-layer vertical black liquor heater, which belongs to the field of pulping and papermaking and comprises a container formed by assembling and welding a barrel, a black liquor inlet and a black liquor outlet, a black liquor inlet connecting pipe and a black liquor inlet flange are welded at a lower conical seal, and a steam inlet pipe joint is welded at an opening of the barrel. A steam inlet flange is welded at the end part of the black liquor outlet pipe joint, a drain outlet pipe joint is welded at the opening of the cylinder body, and a drain outlet flange is welded at the end part of the welded drain outlet pipe joint; a black liquor inlet, a black liquor outlet, a steam inlet and a drain outlet are formed in an inlet of the black liquor heater; and the first-layer container structure is the same as the second-layer container structure. The novel double-layer vertical type black liquor heater is specially provided for transformation of existing old factories, the field black liquor pipelines can be reused conveniently, and convenience is provided for achieving needed functions.

Description

Technical Field

[0001] This utility model belongs to the field of pulp and paper making, and specifically relates to a double-layer vertical black liquor heater. Background Technology

[0002] Currently, in the pulp and paper grade chemical industry, alkali recovery technology plays a role in protecting the environment and recovering resources. It is an indispensable and important part of the pulp and paper process. Through processes such as evaporation, combustion, and causticization, it recovers alkali resources from pulp black liquor on the one hand, and converts the organic matter in pulp black liquor into energy on the other hand, avoiding pollution of the environment by wastewater discharge.

[0003] Therefore, the stable and efficient operation of the alkali furnace plays a crucial role in the stable operation of the entire plant. The efficient operation of the alkali furnace is extremely important to the quality of the black liquor. The temperature of the black liquor coming from the evaporation workshop is about 100℃. The temperature required for the black liquor to burn in the alkali furnace is 130-140℃. Temperature has a great influence on the properties of the black liquor. At this temperature, the viscosity of the black liquor is high, which makes it very difficult to transport in the pipeline. At this time, the dispersion effect entering the alkali furnace is poor, which restricts the combustion efficiency of the alkali furnace. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a double-layer vertical black liquor heater, comprising:

[0005] At least two interconnected cylindrical containers, each containing an inner cylinder in its center. The upper and lower ends of the inner cylinder are located inside the cylindrical container. The upper and lower ends of the inner cylinder are connected to the inner wall of the cylindrical container via an upper ring plate and a lower ring plate, respectively. The inner cylinder, the upper ring plate, and the lower ring plate divide the cylindrical container into a black liquor chamber and an annular steam chamber. First through holes are evenly arranged on the side curved surface of the inner cylinder. All first through holes on the same inner cylinder are evenly arranged radially along the circumference of the inner cylinder in a clockwise or counterclockwise direction. The arrangement direction of the first through holes on the inner cylinders of adjacent cylindrical containers is opposite. The steam chamber of each cylindrical container is connected to a steam pipe through a steam inlet and a drain pipe through a drain outlet, which is closer to the lower end of the steam chamber than the steam inlet. Second through holes are provided on both the upper and lower ring plates along the circumference.

[0006] The cylindrical container is assembled and welded from a cylindrical body, a lower conical seal, and an upper conical seal. A black liquor inlet pipe joint and a black liquor inlet flange are welded at the lower conical seal. A steam inlet pipe joint is welded at the opening in the cylindrical body. A steam inlet flange is welded at the end of the steam inlet pipe joint. A sewage outlet pipe joint is welded at the opening in the cylindrical body. A sewage outlet flange is welded at the end of the sewage outlet pipe joint.

[0007] The inner circumferences of the upper and lower ring plates are sealed and welded to the outer wall of the inner cylinder, and the outer circumferences of the upper and lower ring plates are sealed and welded to the inner circumference of the cylindrical container.

[0008] All the first through holes on the inner cylinder are arranged in multiple rings along the length of the inner cylinder. The position of the first through hole in each ring is staggered from the position of the first through hole in the adjacent ring, and the tangential angle of each first through hole is equal.

[0009] The structure of the first cylindrical container is the same as that of the second cylindrical container.

[0010] The structure of the first-layer heater is the same as that of the second-layer heater. After the black liquor is heated in the first stage, the second-stage heating cylinder is used to make the steam fully mix with the black liquor in the container before the second mixing and heating is carried out to make the black liquor reach the required temperature.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. A new type of double-layer vertical black liquor heater is provided for the renovation of existing old plants, which facilitates the reuse of black liquor pipelines on site and provides convenience for achieving the required functions.

[0013] 2. After the black liquor is fully mixed with steam in the inner cylinder of the first cylindrical container, it enters the inner cylinder of the second cylindrical container and is fully mixed with steam again. The continuous flow of black liquor in the second inner cylinder is conducive to heating the temperature of the black liquor.

[0014] 3. The two inner cylinders are evenly distributed with tangential first through holes. The tangential first through holes are arranged at equal angles, and the angles of the tangential first through holes in adjacent layers are staggered. Steam is sprayed out through the tangential first through holes and mixed with the black liquor, which helps to enhance the mixing effect with the black liquor.

[0015] 4. The temperature of the black liquor at the container outlet can be controlled by adjusting the flow rate of the steam regulating valve.

[0016] 5. Adjacent cylindrical containers are connected by symmetrical conical seals, which increases the pressure of the black liquor after it is fully mixed with the steam in the inner cylinder of the first cylindrical container. This pressure is greater than the steam pressure in the inner cylinder of the second cylindrical container, which helps the black liquor to flow smoothly in the heater. Attached Figure Description

[0017] To more clearly illustrate the background technology or the technical solution of this utility model, the accompanying drawings used in conjunction with the prior art or specific embodiments are briefly introduced below. Obviously, the structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a front view of a novel double-layer vertical black liquor heater according to the present invention.

[0019] Figure 2 This is a top view of a double-layer vertical black liquor heater according to the present invention.

[0020] Figure 3 This is a front view of the upper ring plate of a double-layer vertical black liquor heater according to the present invention.

[0021] Figure 4 This is a front view of the lower ring plate of a double-layer vertical black liquor heater according to the present invention.

[0022] Figure 5 This is a front view of the inner cylinder of a double-layer vertical black liquor heater according to the present invention.

[0023] Figure 6 This is a front view of the odd-numbered perforated inner cylinder layer of the double-layer vertical black liquor heater described in this utility model.

[0024] Figure 7 This is a front view of the even-numbered perforated inner cylinder layer of the double-layer vertical black liquor heater described in this utility model.

[0025] As shown in the figure: 1-Upper cone; 2-Steam inlet flange; 3-Steam inlet pipe joint; 4-Cylinder; 5-Lower cone; 6-Black liquor inlet pipe; 7-Black liquor inlet flange; 8-Upper ring plate; 9-Inner cylinder; 10-Drain outlet pipe joint; 11-Drain outlet flange; 12-Lower ring plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0027] Example 1

[0028] like Figure 1-2As shown, a double-layer vertical black liquor heater includes two interconnected cylindrical containers. An inner cylinder 9 is arranged in the middle of each cylindrical container. The upper and lower ends of the inner cylinder are located inside the cylindrical container. The upper and lower ends of the inner cylinder 9 are connected to the inner wall of the cylindrical container by an upper ring plate 8 and a lower ring plate 12, respectively. The inner cylinder 9, the upper ring plate 8, and the lower ring plate 12 divide the cylindrical container into a black liquor chamber and an annular steam chamber. First through holes are evenly arranged on the side curved surface of the inner cylinder 9. All the first through holes on the same layer of inner cylinder 9 are evenly arranged radially along the circumference of the inner cylinder in a clockwise or counterclockwise direction. The arrangement direction of the first through holes on the two layers of inner cylinder 9 is opposite. The steam chamber of each layer of cylindrical container is connected to a steam pipe through a steam inlet and also connected to a drain pipe through a drain outlet. The drain outlet is closer to the lower end of each layer of steam chamber than the steam inlet.

[0029] Steam located inside the cylindrical container enters the annular steam chamber through the steam inlet, and is ejected through the tangential first through hole to mix with the black liquor in the black liquor chamber, generating a swirling flow around the inner cylinder, which heats the black liquor. The full flow of the black liquor in the chamber is conducive to the uniformity of the black liquor temperature. The black liquor temperature can be controlled by controlling the flow rate of the steam regulating valve, which helps to reduce noise and enhance the mixing effect with the black liquor.

[0030] Both the upper ring plate 8 and the lower ring plate 12 have a second through hole along the circumference. The purpose is to prevent the pressure and impact on the upper and lower ring plates from being too great after the medium-pressure steam enters the steam chamber quickly, and to prevent the ring plates from failing due to insufficient stiffness. In order to fully realize the heating function, the small hole can balance the pressure difference between the steam chamber and the black liquor chamber and reduce the thickness of the ring plate.

[0031] Furthermore, the cylindrical container is assembled and welded from a cylindrical body 4, a lower conical seal 5, and an upper conical seal 1. A black liquor inlet pipe 6 and a black liquor inlet flange 7 are welded at the lower conical seal 1. A steam inlet pipe joint 3 is welded at the opening of the cylindrical body 4. A steam inlet flange 2 is welded at the end of the steam inlet pipe joint 3. A sewage outlet pipe joint 10 is welded at the opening of the cylindrical body 4. A sewage outlet flange 11 is welded at the end of the sewage outlet pipe joint 10.

[0032] Furthermore, the inner circumferences of the upper ring plate 8 and the lower ring plate 12 are sealed and welded to the outer wall of the inner cylinder 9, and the outer circumferences of the upper ring plate 8 and the lower ring plate 12 are sealed and welded to the inner circumference of the cylindrical container.

[0033] Furthermore, all the first through holes on the inner cylinder 9 are arranged in multiple rings along the length of the inner cylinder. The position of the first through hole in each ring is staggered from the position of the first through hole in the adjacent ring, and the tangential angle of each first through hole is equal.

[0034] Furthermore, the structure of the first cylindrical container is consistent with the structure of the second cylindrical container.

[0035] Furthermore, the structure of the first-layer heater is the same as that of the second-layer heater. After the black liquor is heated in the first stage, the second-stage heating cylinder is used to make the steam fully mix with the black liquor in the container before the second mixing and heating is carried out to make the black liquor reach the required temperature.

[0036] Adjacent cylindrical containers are connected by symmetrical conical seals, which increases the pressure of the black liquor after it is fully mixed with the steam in the inner cylinder of the first cylindrical container. This pressure is greater than the steam pressure in the inner cylinder of the second cylindrical container, which helps the black liquor to flow smoothly in the heater.

[0037] The steps for using this solution are as follows: Connect the product to the black liquor inlet pipe. The black liquor enters the first-layer container through the first-layer black liquor inlet pipe. The black liquor passes through the first-layer cylinder, while steam from the steam heating pipe is ejected from many tangential holes and mixes with the black liquor, thus providing primary heating. The full flow of the black liquor within the cavity is beneficial for uniform temperature. The temperature of the black liquor can be controlled by adjusting the flow rate of the steam regulating valve. The black liquor then enters the second-layer container through the intermediate cone and pipe joint. Similarly, steam from the steam heating pipe is ejected from many tangential holes and mixes with the black liquor, thus providing secondary heating to achieve the required black liquor temperature on site.

[0038] This solution provides a new type of double-layer vertical black liquor heater for the renovation of existing old plants, which facilitates the reuse of black liquor pipelines on site and provides convenience for achieving the required functions.

[0039] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A double-layer vertical black liquor heater, characterized in that, It includes at least two interconnected cylindrical containers. Each cylindrical container has an inner cylinder arranged in the middle. The upper and lower ends of the inner cylinder are located inside the cylindrical container. The upper and lower ends of the inner cylinder are connected to the inner wall of the cylindrical container by an upper ring plate and a lower ring plate, respectively. The inner cylinder and the upper and lower ring plates divide the cylindrical container into a black liquor chamber and an annular steam chamber. First through holes are evenly arranged on the side curved surface of the inner cylinder. All the first through holes on the same inner cylinder are evenly arranged radially in a clockwise or counterclockwise direction along the circumference of the inner cylinder. The arrangement direction of the first through holes on the inner cylinders of adjacent cylindrical containers is opposite. The steam chamber of each cylindrical container is connected to a steam pipe through a steam inlet and a drain pipe through a drain outlet. The drain outlet is closer to the lower end of the steam chamber than the steam inlet. Second through holes are opened along the circumference on both the upper and lower ring plates.

2. The double-layer vertical black liquor heater according to claim 1, characterized in that, The cylindrical container is assembled and welded from a cylindrical body, a lower conical seal, and an upper conical seal. A black liquor inlet pipe joint and a black liquor inlet flange are welded at the lower conical seal. A steam inlet pipe joint is welded at the opening in the cylindrical body. A steam inlet flange is welded at the end of the steam inlet pipe joint. A sewage outlet pipe joint is welded at the opening in the cylindrical body. A sewage outlet flange is welded at the end of the sewage outlet pipe joint.

3. The double-layer vertical black liquor heater according to claim 1, characterized in that, The inner circumferences of the upper and lower ring plates are sealed and welded to the outer wall of the inner cylinder, and the outer circumferences of the upper and lower ring plates are sealed and welded to the inner circumference of the cylindrical container.

4. The double-layer vertical black liquor heater according to claim 1, characterized in that, All the first through holes on the inner cylinder are arranged in multiple rings along the length of the inner cylinder. The position of the first through hole in each ring is staggered from the position of the first through hole in the adjacent ring, and the tangential angle of each first through hole is equal.

5. The double-layer vertical black liquor heater according to claim 1, characterized in that, The structure of the first cylindrical container is the same as that of the second cylindrical container.

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