An energy-saving device for high-concentration black liquor evaporation and concentration

Abstract

This utility model discloses an energy-saving device for high-concentration black liquor evaporation and concentration, including a concentrator body. A steam exhaust pipe is located at the top of the concentrator body. A heating coil is located inside the concentrator body, with a steam inlet pipe connected to the bottom of the heating coil and a steam exhaust pipe connected to the top. Both steam exhaust pipes are connected to a steam recovery pipe. The device also includes a heating water tank, with the steam recovery pipe connected to the bottom. Multiple partitions are installed inside the heating water tank, and these partitions are staggered. This utility model heats the water in the heating water tank by recovering the steam generated by the concentrator body and the waste heat from the steam at the tail end of the heating coil. This allows for continuous and efficient absorption of heat from the steam, avoiding excessive heat loss during the recovery process and enabling step-by-step, thorough recovery of heat from the steam. Furthermore, the overall structure does not consume external energy, making it energy-saving and environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of black liquor concentration technology, specifically to an energy-saving device for high-concentration black liquor evaporation and concentration. Background Technology

[0002] The pulp and paper industry generates a large amount of high-concentration black liquor. Direct discharge of this black liquor into rivers not only severely pollutes water sources but also wastes significant resources. Therefore, treating this black liquor is essential to prevent environmental damage. Current treatment methods often involve evaporating and concentrating the black liquor, followed by combustion in a jet furnace. This process requires heating with evaporation and concentration equipment, which uses either electric or steam heating. Because electric heating is more complex and energy-intensive, steam heating is more commonly used. However, current steam heating equipment often fails to fully utilize the waste heat from the steam, resulting in substantial waste. Utility Model Content

[0003] Based on this, the purpose of this utility model is to provide an energy-saving device for high-concentration black liquor evaporation and concentration, so as to solve the technical problems mentioned in the background.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving device for high-concentration black liquor evaporation and concentration, comprising a concentrator body, a steam exhaust pipe I at the top of the concentrator body, characterized in that a heating coil is provided inside the concentrator body, the bottom of the heating coil is connected to a steam inlet pipe, and the top is connected to a steam exhaust pipe II, both the steam exhaust pipe I and the steam exhaust pipe II are connected to a steam recovery pipe, and also includes a heating water tank, the bottom of the heating water tank is connected to the steam recovery pipe, and the heating water tank is provided with multiple partitions, the multiple partitions being staggered from each other.

[0005] Furthermore, both steam discharge pipe one and steam discharge pipe two are equipped with one-way valves, and a steam pump is installed on the steam recovery pipe.

[0006] Furthermore, the bottom side of the heating water tank is connected to an inlet pipe, the top side is connected to an outlet pipe, and the top is equipped with a steam exhaust pipe.

[0007] Furthermore, one end of each partition is fixedly connected to the inner wall of the heating water tank, and a filter screen is provided between the other end and the inner wall of the heating water tank.

[0008] In summary, the present invention has the following main advantages:

[0009] This invention heats the water in the heating tank by recovering the steam generated by the concentrator body and the waste heat of the steam at the tail of the heating coil. It continuously and efficiently absorbs the heat in the steam, which not only avoids excessive heat loss during the recovery process, but also fully recovers the heat in the steam in stages. At the same time, the overall structure does not consume external energy, making it energy-saving and environmentally friendly. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0011] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0012] The embodiments of this utility model will be described below based on its overall structure.

[0013] like Figure 1 As shown, this utility model includes a concentrator body 1, a steam exhaust pipe 5 at the top of the concentrator body 1, a heating coil 2 inside the concentrator body 1, a steam inlet pipe 3 at the bottom of the heating coil 2, and a steam exhaust pipe 4 at the top. Both the steam exhaust pipe 5 and the steam exhaust pipe 4 are connected to a steam recovery pipe 6. It also includes a heating water tank 9, with the steam recovery pipe 6 connected to the bottom of the heating water tank 9. The heating water tank 9 has multiple partitions 10 inside, which are staggered. One end of each partition 10 is fixedly connected to the inner wall of the heating water tank 9, and a filter screen 11 is provided between the other end and the inner wall of the heating water tank 9.

[0014] One-way valves 7 are installed on both steam discharge pipe 1 5 and steam discharge pipe 2 4. A steam pump 8 is installed on the steam recovery pipe. The bottom side of the heating water tank 9 is connected to the water inlet pipe 12, and the top side is connected to the water outlet pipe 13. A steam discharge pipe 3 14 is provided on the top.

[0015] The working principle of this utility model is as follows: Steam in the boiler heats and evaporates the black liquor in the thickener body 1 through the heating coil 2. The waste heat of the steam is discharged into the steam recovery pipe 6 through the discharge pipe 2 4. The steam generated by the thickener body 1 is discharged into the steam recovery pipe 6 through the steam discharge pipe 1 5. The steam recovery pipe 6 is pumped into the heating water tank 9 by the steam pump 8 to heat the cold water in the heating water tank 9. After the steam enters the bottom of the heating water tank 9, steam bubbles begin to be generated. The steam bubbles slowly rise along the bottom surface of the lowest partition 10. The steam bubbles come into contact with the cold water... During the process, heat is rapidly absorbed and condensed to mix with water. When the bubbles rise to the filter screen 11, they are broken into smaller bubbles by the filter screen 11 and continue to rise, slowly floating up along the bottom surface of the upper filter screen 11. Cold water continuously recovers the heat and water in the steam bubbles. The water that has absorbed heat is discharged from the outlet pipe 13 for centralized utilization. Finally, the hot air that floats to the surface is discharged upward through the steam exhaust pipe 14 to continue heating the concentrator body 1, achieving the effect of continuous and efficient recovery of steam heat. This is the working principle of this energy-saving steam waste heat recovery device.

[0016] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. An energy-saving device for evaporating and concentrating high-concentration black liquor, comprising a concentrator body, wherein a steam exhaust pipe is provided at the top of the concentrator body, characterized in that, The concentrator body is equipped with a heating coil. The bottom of the heating coil is connected to a steam inlet pipe, and the top is connected to a second steam outlet pipe. Both the first and second steam outlet pipes are connected to a steam recovery pipe. The concentrator also includes a heating water tank. The bottom of the heating water tank is connected to the steam recovery pipe. The heating water tank is equipped with multiple partitions, which are staggered from each other.

2. The energy-saving device for high-concentration black liquor evaporation and concentration according to claim 1, characterized in that: One-way valves are installed on both steam discharge pipe one and steam discharge pipe two, and a steam pump is installed on the steam recovery pipe.

3. The energy-saving device for high-concentration black liquor evaporation and concentration according to claim 1, characterized in that: The bottom side of the heating water tank is connected to an inlet pipe, the top side is connected to an outlet pipe, and the top is equipped with a steam exhaust pipe.

4. The energy-saving device for high-concentration black liquor evaporation and concentration according to claim 1, characterized in that: One end of each partition is fixedly connected to the inner wall of the heating water tank, and a filter screen is provided between the other end and the inner wall of the heating water tank.

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