Black liquor evaporation light-pollution condensate water recycling system

Abstract

The utility model discloses a black liquor evaporation light-pollution condensate water recycling system which comprises a condensate water tank, a circulating water tank, a hot water tank, a clear water tank and an acid preparation tank, an outlet pipeline of the condensate water tank is connected with a condensate pump; an outlet pipeline of the condensate pump is provided with a first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe; the first branch pipe is connected to the circulating water tank, the second branch pipe is connected to the hot water tank, the third branch pipe is connected to the clear water tank, and the fourth branch pipe is connected to the acid preparation tank. According to the technical scheme provided by the utility model, high-temperature light-pollution condensate water discharged from a black liquor evaporation section of the chemimechanical pulp line can be fully recycled, so that the aims of energy conservation and emission reduction are fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a black liquor evaporation lightly polluted condensed water recycling system. Background Art

[0002] Papermaking and pulping consume a lot of water. In the prior art, the high-temperature, lightly polluted condensed water discharged from the black liquor evaporation section of the chemical-mechanical pulping line is not effectively recycled, but directly discharged, resulting in a waste of water resources. In view of the above technical problems, this application proposes a new technical solution that can effectively recycle the high-temperature condensed water discharged from the black liquor evaporation section of the chemical-mechanical pulping line to achieve the purpose of energy saving and emission reduction.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a black liquor evaporation lightly polluted condensate water recycling system, aiming to solve the technical problem that the high-temperature lightly polluted condensate water discharged from the black liquor evaporation section of the chemical pulping line in the prior art is not effectively recycled.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A black liquor evaporation light pollution condensate recycling and reuse system comprises a condensate water tank, a circulating water pool, a hot water tank, a clean water tank and an acid preparation tank; the outlet pipe of the condensate water tank is connected to a condensate water pump, and the outlet pipe of the condensate water pump is provided with a first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe; the first branch pipe is connected to the circulating water pool, the second branch pipe is connected to the hot water tank, the third branch pipe is connected to the clean water tank, and the fourth branch pipe is connected to the acid preparation tank.

[0007] Furthermore, in the black liquor evaporation and light pollution condensate water recycling system, the first branch pipe is provided with a first regulating valve and a first flow sensor; the second branch pipe is provided with a second regulating valve and a second flow sensor; the third branch pipe is provided with a third regulating valve and a third flow sensor; and the fourth branch pipe is provided with a fourth regulating valve and a fourth flow sensor.

[0008] Furthermore, in the black liquor evaporation and light pollution condensate water recycling and reuse system, a first liquid level sensor is provided in the circulating water pool; a second liquid level sensor is provided in the hot water tank; a third liquid level sensor is provided in the clean water tank; and a fourth liquid level sensor is provided in the acid preparation tank.

[0009] Furthermore, in the black liquor evaporation light pollution condensate water recycling and reuse system, a fifth regulating valve is provided on the outlet pipe of the condensate water tank.

[0010] Furthermore, in the black liquor evaporation light pollution condensate water recycling and reuse system, the condensate water pump is a centrifugal pump.

[0011] Beneficial effect: The utility model provides a black liquor evaporation light pollution condensate water recycling and reuse system. Compared with the prior art, by setting a condensate water tank, a circulating water pool, a hot water tank, a clean water tank and an acid preparation tank, as well as a condensate water pump, etc., the black liquor evaporation light pollution condensate water can be collected and distributed so as to be further sent to other water use points, thereby realizing the recycling of black liquor evaporation light pollution condensate water and achieving the purpose of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a simplified structural diagram of the black liquor evaporation and light pollution condensate water recycling system. DETAILED DESCRIPTION

[0013] The utility model provides a black liquor evaporation light pollution condensate water recycling system. In order to make the purpose, technical scheme and effect of the utility model clearer and more specific, the utility model is further described in detail below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0014] See also Figure 1 The utility model provides a black liquor evaporation and light pollution condensate water recycling and reuse system. The drawings are only used to explain the structural principles and are not proportional to the actual products. The drawings only show the structures related to the invention points of this application, and some conventional structures are not specifically drawn. The terms "first", "second", etc. described in this article are merely different names for similar structures for the convenience of explanation, and are not intended to limit this application. The direction of the arrow in the figure indicates the flow direction of the liquid under normal circumstances.

[0015] The black liquor evaporation light pollution condensate recycling and reuse system comprises a condensate tank 1, a circulating water pool 41, a hot water tank 42, a clean water tank 43 and an acid preparation tank 44; the outlet pipe of the condensate tank is connected to a condensate pump 2, and the outlet pipe 3 of the condensate pump is provided with a first branch pipe 31, a second branch pipe 32, a third branch pipe 33 and a fourth branch pipe 34; the first branch pipe is connected to the circulating water pool, the second branch pipe is connected to the hot water tank, the third branch pipe is connected to the clean water tank, and the fourth branch pipe is connected to the acid preparation tank.

[0016] Furthermore, the first branch pipe is provided with a first regulating valve 51 and a first flow sensor 61; the second branch pipe is provided with a second regulating valve 52 and a second flow sensor 62; the third branch pipe is provided with a third regulating valve 53 and a third flow sensor 63; the fourth branch pipe is provided with a fourth regulating valve 54 and a fourth flow sensor 64. By providing the above-mentioned regulating valves and flow sensors, it is convenient to control the flow of each branch pipe, so that the recovered condensed water can be effectively distributed in the circulating water tank, hot water tank, clean water tank and acid preparation tank.

[0017] Furthermore, a first liquid level sensor 71 is provided in the circulating water tank; a second liquid level sensor 73 is provided in the hot water tank; a third liquid level sensor 73 is provided in the clean water tank; and a fourth liquid level sensor 74 is provided in the acid preparation tank. By providing the above-mentioned liquid level sensors, it is convenient to control the liquid levels in the circulating water tank, the hot water tank, the clean water tank and the acid preparation tank. In practical applications, the second regulating valve and the second sensor can be interlocked to realize automatic control of the opening of the second regulating valve according to the liquid level in the hot water tank.

[0018] Furthermore, a fifth regulating valve 55 is provided on the outlet pipe of the condensate tank.

[0019] Preferably, the condensate pump is a centrifugal pump.

[0020] In actual use, the lightly polluted condensate from the evaporation of black liquor is collected in a condensate tank, and is sent to a circulating water tank, a hot water tank, a clean water tank and an acid preparation tank respectively through the action of a condensate pump. The water in the circulating water tank is used as wood chip washing water for the chemical-mechanical pulping line and the hot pulping line, thereby reducing the amount of clean water used in the circulating water tank. The water in the hot water tank is used as the hot water required for chemical-mechanical pulping, thereby reducing the amount of clean water used in the hot water tank and reducing the amount of steam used for heating. The water in the clean water tank is used for evaporation and cleaning of the water system, thereby reducing the amount of clean water used for evaporation and cleaning. The water in the acid preparation tank is used for dilution water for the preparation of evaporation and cleaning liquid, thereby reducing the amount of clean water used for evaporation and cleaning. It can be seen that after adopting the technical solution proposed in this application, the high-temperature lightly polluted condensate discharged from the black liquor evaporation section of the chemical-mechanical pulping line is fully recycled, achieving the purpose of energy saving and emission reduction.

[0021] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A black liquor evaporation light pollution condensate recycling system, comprising a condensate tank, characterized in that: It also includes a circulating water tank, a hot water tank, a clean water tank and an acid preparation tank; the outlet pipe of the condensing water tank is connected to a condensing water pump, and the outlet pipe of the condensing water pump is provided with a first branch pipe, a second branch pipe, a third branch pipe and a fourth branch pipe; the first branch pipe is connected to the circulating water tank, the second branch pipe is connected to the hot water tank, the third branch pipe is connected to the clean water tank, and the fourth branch pipe is connected to the acid preparation tank.

2. The black liquor evaporation light pollution condensate water recycling system according to claim 1 is characterized in that: The first branch pipe is provided with a first regulating valve and a first flow sensor; the second branch pipe is provided with a second regulating valve and a second flow sensor; the third branch pipe is provided with a third regulating valve and a third flow sensor; the fourth branch pipe is provided with a fourth regulating valve and a fourth flow sensor.

3. The black liquor evaporation light pollution condensate water recycling system according to claim 2 is characterized in that: A first liquid level sensor is arranged in the circulating water tank; a second liquid level sensor is arranged in the hot water tank; a third liquid level sensor is arranged in the clean water tank; and a fourth liquid level sensor is arranged in the acid preparation tank.

4. The black liquor evaporation light pollution condensate water recycling system according to claim 1 is characterized in that: A fifth regulating valve is arranged on the outlet pipe of the condensate tank.

5. The black liquor evaporation light pollution condensate water recycling system according to claim 1 is characterized in that: The condensate pump is a centrifugal pump.

Images