Multi-effect evaporator for desulfurization wastewater treatment
By heating the water with high-temperature flue gas to form steam and concentrating it in a multi-stage evaporation tank, the problem of large energy consumption in the prior art is solved, and efficient treatment of desulfurization wastewater and energy efficiency are achieved.
Patent Information
- Application Number
- CN202422049728.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-23
AI Technical Summary
When the existing multi-effect evaporators treat desulfurization wastewater, the steam heats cold water to cause large energy consumption, and the discharged steam needs to be condensed, making the energy utilization efficiency low.
The water is heated to form steam, and the steam passing through the evaporation tank is used to prepare the desulfurization slurry. Through the design of the multi-stage evaporation tank and the use of the flue gas heat exchange chamber, the efficient utilization of steam is achieved.
It realizes the effective utilization of high-temperature flue gas heat, reduces the heating time and energy consumption of the desulfurization slurry, and improves the overall energy efficiency.
Smart Images
Figure CN223033155U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of desulfurized waste water, and particularly relates to a multi-effect evaporator for desulfurized waste water treatment. Background Art
[0002] Wet desulfurization is one of the common flue gas desulfurization methods. The desulfurization slurry is sprayed on the flue gas to achieve the purpose of flue gas desulfurization. After the desulfurization slurry is sprayed, desulfurized waste water will be formed, which needs to be further treated. The multi-effect evaporator is one of the common treatment devices. The desulfurized waste water is placed in the evaporation tank and heated and concentrated by steam. Then it enters the second-stage and third-stage evaporation tanks for second-effect and third-effect evaporation, and finally the desulfurized waste water is efficiently treated. However, the steam in the common evaporation tank generally uses the method of heating cold water, and the method of directly heating cold water to obtain steam has the problem of large energy consumption. On the other hand, the discharged steam also needs to be condensed and cannot be directly discharged, and this step also has the problem of low energy utilization efficiency. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a multi-effect evaporator for desulfurized waste water treatment that saves energy and ensures energy efficiency in view of the deficiencies in the above background art.
[0004] To achieve the above purpose, a multi-effect evaporator for desulfurized waste water treatment of the utility model adopts the following technical solutions:
[0005] A multi-effect evaporator for desulfurized waste water treatment includes a first-stage evaporation tank. The first-stage evaporation tank is provided with a first feed port, a first steam inlet, a first steam outlet, a first discharge port, and a first condensate outlet. A second-stage evaporation tank and a third-stage evaporation tank are arranged beside the first-stage evaporation tank. The second-stage evaporation tank is provided with a second feed port, a second steam inlet, a second steam outlet, a second discharge port, and a second condensate outlet. The third-stage evaporation tank is provided with a third feed port, a third steam inlet, a third steam outlet, a third discharge port, and a third condensate outlet. The first steam outlet is connected to the second steam inlet, the second steam outlet is connected to the third steam inlet, the first discharge port is connected to the second feed port, and the second discharge port is connected to the third feed port. A heating tank is arranged at the front end of the first-stage evaporation tank. Cold water is arranged in the heating tank. The heating tank is provided with an air outlet, and the air outlet is connected to the first steam inlet. A sandwich layer is arranged outside the heating tank, and the flue gas flowing into the desulfurization tower flows in the sandwich layer. The third steam outlet is connected to a water tank, and the water tank is used for the preparation of desulfurization slurry.
[0006] A further improvement of the multi-effect evaporator for desulfurized waste water treatment of the utility model lies in that the first condensate outlet, the second condensate outlet, and the third condensate outlet are connected to the inside of the heating tank.
[0007] A further improvement of the multi-effect evaporator for desulfurized wastewater treatment in the present utility model lies in that a flue gas outlet and a flue gas inlet are provided on the interlayer. The flue gas outlet is connected to the desulfurization tower through a connecting pipe. A heat exchange chamber is provided outside the pipelines between the first steam outlet and the second steam inlet, and between the second steam outlet and the third steam inlet. A circulation pipe is provided on the connecting pipe and is connected to the heat exchange chamber.
[0008] A further improvement of the multi-effect evaporator for desulfurized wastewater treatment in the present utility model lies in that the air outlet is also connected to the second steam inlet and the third steam inlet through a branch pipe.
[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0010] The present utility model uses high-temperature flue gas to heat water to form steam for the evaporation tank, and uses the steam passing through the evaporation tank for the preparation of desulfurized slurry, realizing the utilization of the heat of high-temperature flue gas. At the same time, it also reduces the heating time and energy of the desulfurized slurry, improving the overall energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a schematic structural diagram of the present utility model;
[0012] In the figure: 1 primary evaporation tank, 2 first feed inlet, 3 first discharge outlet, 4 first steam inlet, 5 first steam outlet, 6 first condensate outlet, 7 secondary evaporation tank, 8 second feed inlet, 9 second steam inlet, 10 second discharge outlet, 11 second steam outlet, 12 second condensate outlet, 13 tertiary evaporation tank, 14 third feed inlet, 15 third steam inlet, 16 third condensate outlet, 17 third steam outlet, 18 third discharge outlet, 19 water tank, 20 heating tank, 21 desulfurization tower, 22 flue gas inlet, 23 water inlet, 24 flue gas outlet, 25 air outlet, 26 circulation pipe, 27 heat exchange chamber, 28 connecting pipe, 29 branch pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.
[0014] Such as Figure 1As shown in the figure, a multi-effect evaporator for desulfurized wastewater treatment includes a primary evaporation tank 1, which is provided with a first feed inlet 2, a first steam inlet 4, a first steam outlet 5, a first discharge outlet 3, and a first condensate outlet 4. A secondary evaporation tank 7 and a tertiary evaporation tank 13 are arranged beside the primary evaporation tank. The secondary evaporation tank is provided with a second feed inlet 8, a second steam inlet 9, a second steam outlet 11, a second discharge outlet 10, and a second condensate outlet 12. The tertiary evaporation tank is provided with a third feed inlet 14, a third steam inlet 15, a third steam outlet 17, a third discharge outlet 18, and a third condensate outlet 16. The first steam outlet is connected to the second steam inlet, the second steam outlet is connected to the third steam inlet, the first discharge outlet is connected to the second feed inlet, and the second discharge outlet is connected to the third feed inlet. A heating tank 20 is arranged at the front end of the primary evaporation tank. The heating tank is provided with a water inlet 23, and cold water is arranged inside the heating tank. The heating tank is provided with an air outlet 25, and the air outlet is connected to the first steam inlet. A sandwich layer is arranged outside the heating tank, and flue gas flowing into the desulfurization tower flows inside the sandwich layer. The third steam outlet is connected to a water tank 19, and the water tank is used for the preparation of desulfurized slurry.
[0015] Further, the first condensate outlet, the second condensate outlet, and the third condensate outlet are connected inside the heating tank. The condensate is recovered for reuse.
[0016] Further, a flue gas outlet 24 and a flue gas inlet 22 are arranged on the sandwich layer. The flue gas outlet is connected to the desulfurization tower through a connecting pipe 28. A heat exchange cavity 27 is arranged outside the pipes between the first steam outlet and the second steam inlet and between the second steam outlet and the third steam inlet. A circulating pipe 26 is arranged on the connecting pipe and is connected to the heat exchange cavity. Valves can be arranged on each pipe. It is used to selectively heat and increase the temperature of the steam after the first effect and the second effect, and improve the concentration treatment effect of the second effect and the third effect.
[0017] The air outlet is also connected to the second steam inlet and the third steam inlet through a branch pipe 29. Similarly, it is selectively used to increase the temperature of the steam after the first effect and the second effect to ensure the effect.
[0018] The working principle of the present utility model is as follows: High-temperature flue gas heats water into steam, and then the steam enters the three evaporation tanks in sequence. The desulfurized wastewater also enters the three evaporation tanks in sequence for concentration treatment. During the treatment process, if the treatment effects of the secondary and tertiary evaporation tanks are not good, the steam temperature can be increased, including using flue gas heat exchange or directly supplementing high-temperature steam. Finally, the steam discharged from the tertiary evaporation tank directly enters the water tank to increase the temperature of the water in the water tank, and the water is used for the preparation of desulfurized slurry, reducing the preheating time of the desulfurized slurry. Overall, the energy temperatures at all levels are efficiently utilized, achieving energy conservation while ensuring stability.
[0019] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.
Claims
1. A multiple-effect evaporator for desulfurization wastewater treatment, characterized in that: The invention comprises a first-stage evaporator, on which a first feed port, a first steam inlet, a first steam outlet, a first discharge port and a first condensed water outlet are provided, a second-stage evaporator and a third-stage evaporator are provided beside the first-stage evaporator, the second feed port, a second steam inlet, a second steam outlet, a second discharge port and a second condensed water outlet are provided on the second-stage evaporator, the third feed port, a third steam inlet, a third steam outlet, a third discharge port and a third condensed water outlet are provided on the third-stage evaporator, the first steam outlet is connected to the second steam inlet, the second steam outlet is connected to the third steam inlet, the first discharge port is connected to the second feed port, and the second discharge port is connected to the third feed port, a heating tank is provided at the front end of the first-stage evaporator, cold water is provided in the heating tank, an air outlet is provided on the heating tank, the air outlet is connected to the first steam inlet, an interlayer is provided on the outer side of the heating tank, flue gas flows into the desulfurization tower in the interlayer, the third steam outlet is connected to a water pool, and the water pool is used for preparing desulfurization slurry.
2. A multiple-effect evaporator for desulfurization wastewater treatment according to claim 1, characterized in that: The first condensed water outlet, the second condensed water outlet, and the third condensed water outlet are connected to the heating tank.
3. A multiple-effect evaporator for desulfurization wastewater treatment according to claim 2, characterized in that: The interlayer is provided with a flue gas outlet and a flue gas inlet, the flue gas outlet is connected to the desulfurization tower through a connecting pipe, a heat exchange cavity is arranged outside the pipe between the first steam outlet and the second steam inlet and the pipe between the second steam outlet and the third steam inlet, and a circulation pipe is arranged on the connecting pipe to connect to the heat exchange cavity.
4. A multiple-effect evaporator for desulfurization wastewater treatment according to claim 3, characterized in that: The gas outlet is also connected to the second steam inlet and the third steam inlet through branch pipes.