Wet desulphurization wastewater utilization system for coal-fired power plant

Abstract

The utility model discloses a coal-fired power plant wet desulfurization wastewater utilization system which comprises a desulfurization tower, a flue gas inlet pipe arranged at the lower part of the desulfurization tower, a flue gas outlet pipe arranged at the upper part of the desulfurization tower, a spray pipe arranged in the desulfurization tower, a standing box connected to the bottom of the desulfurization tower, a neutralization box connected to the lower end of the standing box, and a discharge port arranged at the lower end of the neutralization box, interlayers are arranged on the outer sides of the standing box and the neutralizing box and connected to a water inlet pipe and a water outlet pipe, the water outlet pipe is connected to a slurry pond, a communicating pipe is arranged in the middle of the standing box and connected to a fixing box, and a second interlayer is arranged on the outer side of the fixing box and connected to a flue gas inlet pipe through two sets of pipelines in a circulating mode. The upper end of the fixed box is connected to the slurry pond. Desulfurization waste water is placed in the standing box to be preliminarily layered, upper-layer liquid is circularly sprayed or is subjected to heat exchange crystallization through high-temperature flue gas to obtain water vapor, the hot water vapor can be mixed with slurry, the temperature of the slurry is increased, and then the desulfurization effect of the slurry is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization treatment equipment, in particular to a wet desulfurization wastewater utilization system for a coal-fired power plant. Background Art

[0002] Wet desulfurization is one of the flue gas desulfurization treatment methods, which mainly relies on spraying desulfurization slurry to contact with flue gas to achieve desulfurization. After the desulfurization slurry contacts the flue gas, desulfurization wastewater will be formed. The treatment of desulfurization wastewater generally adopts neutralization, flocculation, precipitation and concentration. However, conventional treatment methods have the problems of insufficient energy utilization, low energy efficiency and waste of resources. Utility Model Content

[0003] The purpose of the utility model is to address the deficiencies in the above-mentioned background technology and to provide a system for efficiently recycling and utilizing wet desulfurization wastewater to improve energy efficiency.

[0004] To achieve the above objectives, the utility model provides a coal-fired power plant wet desulfurization wastewater utilization system, which adopts the following technical solutions:

[0005] A wet desulfurization wastewater utilization system for a coal-fired power plant includes a desulfurization tower, a flue gas inlet pipe is provided at the lower part of the desulfurization tower, a flue gas outlet pipe is provided at the upper part, a spray pipe is provided in the desulfurization tower, the bottom of the desulfurization tower is connected to a still box, the lower end of the still box is connected to a neutralization box, the lower end of the neutralization box is provided with a discharge port, the outsides of the still box and the neutralization box are both provided with interlayers, the interlayers are connected to a water inlet pipe, the interlayers are also connected to a water outlet pipe, the water outlet pipe is connected to a slurry pool, a connecting pipe is also provided in the middle of the still box, the connecting pipe is connected to a fixed box, a second interlayer is provided on the outside of the fixed box, the second interlayer is circulated and connected to the flue gas inlet pipe through two groups of pipes, and the upper end of the fixed box is connected to the slurry pool.

[0006] The utility model is a further improvement of the wet desulfurization wastewater utilization system of a coal-fired power plant in that the lower end of the static box is connected to the neutralization box through a support frame, and the upper end of the neutralization box is also provided with a stirring motor and a dosing port.

[0007] A further improvement of the wet desulfurization wastewater utilization system of a coal-fired power plant of the utility model is that the connecting pipe is also connected to the spray pipe.

[0008] A further improvement of the wet desulfurization wastewater utilization system of a coal-fired power plant of the utility model is that the fixed box is also connected to the auxiliary outlet pipe.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The utility model places the desulfurization wastewater in a static box for preliminary stratification, and the upper layer liquid is circulated and sprayed or uses high-temperature flue gas heat exchange crystallization to obtain water vapor. The hot water vapor can be mixed with the slurry to increase the temperature of the slurry, thereby ensuring its desulfurization effect. On the other hand, an interlayer is provided on the outside of the static box and the neutralization box for heat exchange with cold water. The water after heat exchange also enters the slurry pool for slurry preparation, which can improve the stability of the slurry and thus improve the subsequent spraying desulfurization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] In the figure: 1 desulfurization tower, 2 flue gas inlet pipe, 3 flue gas outlet pipe, 4 spray pipe, 5 static box, 6 neutralization box, 7 interlayer, 8 connecting pipe, 9 fixed box, 10 second interlayer, 11 slurry pool, 12 auxiliary outlet pipe, 13 water inlet pipe, 14 water outlet pipe. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] like Figure 1 As shown, a wet desulfurization wastewater utilization system for a coal-fired power plant includes a desulfurization tower 1, with a flue gas inlet pipe 2 at the bottom and a flue gas outlet pipe 3 at the top. A spray pipe 4 is provided inside the desulfurization tower. The bottom of the desulfurization tower is connected to a still box 5, the lower end of which is connected to a neutralization box 6, and the lower end of the neutralization box is provided with a discharge port for connecting to a subsequent flocculation box, etc. The outside of the still box and the neutralization box are both provided with an interlayer 7, which is connected to an inlet pipe 13 and an outlet pipe 14, which is connected to a slurry tank 11. A connecting pipe 8 is also provided in the middle of the still box, which is connected to a fixed box 9. A second interlayer 10 is provided on the outside of the fixed box. The second interlayer is circulated and connected to the flue gas inlet pipe through two sets of pipes. The upper end of the fixed box is connected to the slurry tank. Valves and pump bodies can be arranged between the above structures as needed.

[0015] The lower end of the static box is connected to the neutralization box through a support frame. The upper end of the neutralization box is also equipped with a stirring motor and a dosing port. The two are connected close to each other to reduce space occupation.

[0016] The connecting pipe is also connected to the spray pipe. Part of the desulfurization wastewater is used for circulating spraying to improve utilization efficiency.

[0017] The fixed box is also connected to the auxiliary outlet pipe 12. The water vapor is discharged and can be used to connect the structure that needs water vapor in the external position.

[0018] The working principle of the present invention is as follows: the desulfurization wastewater enters the standing box, and after standing, the upper liquid enters the spray circulation or enters the fixed box to be crystallized by heat exchange with high-temperature flue gas, and at the same time forms water vapor, which can be mixed with the cold slurry to achieve preheating of the slurry; on the other hand, the standing box and the neutralization box can exchange heat with water to improve the stability of the water, and then when it is used to make the slurry, it can also ensure the stability of the slurry, and thus also ensure the desulfurization effect; that is, on the whole, the desulfurization wastewater uses its heat to exchange heat with water, and the upper part of the wastewater is used for crystallization and evaporation to form water vapor, which is also used to increase the temperature of the slurry to ensure the desulfurization effect.

[0019] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A coal-fired power plant wet desulfurization wastewater utilization system, characterized by: It includes a desulfurization tower, a flue gas inlet pipe is provided at the lower part of the desulfurization tower, a flue gas outlet pipe is provided at the upper part, a spray pipe is provided in the desulfurization tower, the bottom of the desulfurization tower is connected to a static box, the lower end of the static box is connected to a neutralization box, the lower end of the neutralization box is provided with a discharge port, the static box and the neutralization box are both provided with interlayers on the outside, the interlayers are connected to a water inlet pipe, the interlayers are also connected to a water outlet pipe, the water outlet pipe is connected to a slurry pool, a connecting pipe is also provided in the middle of the static box, the connecting pipe is connected to a fixed box, a second interlayer is provided on the outside of the fixed box, the second interlayer is connected to the flue gas inlet pipe through two groups of pipe circulation, and the upper end of the fixed box is connected to the slurry pool.

2. A coal-fired power plant wet desulfurization wastewater utilization system according to claim 1, characterized in that: The lower end of the static box is connected to the neutralization box through a support frame, and the upper end of the neutralization box is also provided with a stirring motor and a dosing port.

3. A coal-fired power plant wet desulfurization wastewater utilization system according to claim 2, characterized in that: The communicating pipe is also connected to the spray pipe.

4. A coal-fired power plant wet desulfurization wastewater utilization system according to claim 3, characterized in that: The fixed box is also connected to the auxiliary outlet pipe.

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