Bypass flue gas evaporation device

Abstract

The utility model discloses a bypass flue gas evaporation device, which belongs to the field of evaporation towers and comprises a bin pump, the top and the bottom of the bin pump are respectively connected with an auxiliary blowing main pipe through a top auxiliary blowing pipeline and a bottom auxiliary blowing pipeline, and the right side of a discharge port at the bottom of the bin pump is connected with a discharge ash conveying pipeline. One end, far away from the bin pump, of the discharging and ash conveying pipeline is communicated to an outlet flue of the evaporation tower, a discharging port blowing assisting pipeline is connected between the blowing assisting mother pipe and the discharging and ash conveying pipeline, and a return conveying pipeline is arranged on the discharging and ash conveying pipeline; the discharging ash conveying pipeline is directly connected with the outlet flue of the evaporation tower to shorten the distance and prevent hardening by using waste heat, meanwhile, accumulated ash is purged by using compressed air through a system formed by the bin pump, the blowing-assisting main pipe, the blowing-assisting pipelines and the valves, and the discharging ash conveying pipeline is provided with the return conveying pipeline, so that the blockage removal operation of blowing the ash back to the ash hopper in batches is realized when the ash is blocked. And stable operation of the system is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of evaporation tower technology, specifically relating to a bypass flue gas evaporation device. Background Technology

[0002] The function of the desulfurization wastewater bypass flue gas evaporation system is to use the temperature of boiler flue gas to evaporate and crystallize the desulfurization wastewater. The dust and water vapor generated after evaporation return to the boiler flue with the flue gas. Electrostatic dust removal is used to capture chloride ions and other solid particles and metal elements. The evaporated water vapor enters the desulfurization tower, achieving true zero discharge of desulfurization wastewater treatment with no waste gas, no wastewater, and no waste solids.

[0003] In the actual operation of the desulfurization wastewater bypass flue gas evaporation system, several problems have emerged that urgently need to be addressed, especially regarding the core treatment equipment. Firstly, the ash conveying device at the bottom of the evaporation tower, responsible for transporting the ash powder generated after evaporation and crystallization, is located a considerable distance from the ash silo, resulting in excessively long ash conveying pipelines. This long-distance ash transport easily leads to ash accumulation and blockage inside the pipelines, severely affecting the continuity and stability of ash transport. Secondly, the salts formed after the desulfurization wastewater undergoes evaporation and crystallization are prone to moisture reabsorption during the cooling stage due to their inherent properties, leading to caking. This caking significantly reduces the fluidity of the ash, further increasing the risk of blockage in the ash conveying device and connected pipelines, posing a significant challenge to the stable operation of the entire system. Utility Model Content

[0004] The purpose of this utility model is to provide a bypass flue gas evaporation device to solve the technical problems of the bypass flue gas evaporation system for desulfurization wastewater, such as the long distance between the ash conveying device at the bottom of the evaporation tower and the ash conveying pipeline being prone to blockage due to its distance from the ash silo, and the increased risk of blockage of the ash conveying device and pipeline due to the cooling and dampening of the evaporated crystallized salts.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bypass flue gas evaporation device, including a silo pump, the top and bottom of which are connected to a main evaporation pipe via a top evaporation pipe and a bottom evaporation pipe, respectively; a discharge ash conveying pipe is connected to the right side of the bottom discharge port of the silo pump; the end of the discharge ash conveying pipe away from the silo pump is connected to the outlet flue of the evaporation tower; a discharge port evaporation pipe is connected between the main evaporation pipe and the discharge ash conveying pipe; and a return conveying pipe is provided on the discharge ash conveying pipe.

[0006] Furthermore, the end of the blow-assisted main pipe furthest from the chamber pump is used to inject compressed air.

[0007] Furthermore, the blow-assisted main pipe is equipped with a No. 1 manual valve, a No. 1 pressure reducing valve, and a No. 1 pneumatic valve.

[0008] Furthermore, the discharge port blowing pipe is equipped with a No. 2 manual valve, a No. 2 pressure reducing valve, a No. 2 pneumatic valve, and a No. 2 check valve.

[0009] Furthermore, the silo pump is equipped with a level switch LC, a pressure gauge FI, and a pressure transmitter FT.

[0010] Furthermore, a feed valve is provided between the silo pump and the ash hopper.

[0011] Furthermore, the bottom blowing aid pipe includes a bottom side blowing aid pipe and a bottom vertical blowing aid pipe. The bottom side blowing aid pipe is connected to the bottom side of the silo pump, and the bottom vertical blowing aid pipe is connected to the bottom of the silo pump.

[0012] Furthermore, the top blowing pipe, the bottom side blowing pipe, and the bottom vertical blowing pipe are all equipped with a No. 3 manual valve and a No. 3 check valve.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This bypass flue gas evaporation device directly connects the discharge ash conveying pipeline to the evaporation tower outlet flue to shorten the distance and utilize waste heat to prevent caking. At the same time, through the system consisting of the silo pump, the auxiliary blowing main pipe, and various auxiliary blowing pipes and valves, compressed air is used to blow away the accumulated ash. A return pipeline is also provided in the discharge ash conveying pipeline to realize the unblocking operation of blowing the dust back to the ash hopper in batches when blockage occurs, ensuring the stable operation of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the bypass flue gas evaporation device.

[0016] In the diagram: 1. Silo pump; 11. Discharge port valve; 2. Main blowing pipe; 21. Manual valve No. 1; 22. Pressure reducing valve No. 1; 23. Pneumatic valve No. 1; 3. Top blowing pipe; 31. Manual valve No. 3; 32. Check valve No. 3; 4. Bottom side blowing pipe; 5. Bottom vertical blowing pipe; 6. Discharge port blowing pipe; 61. Manual valve No. 2; 62. Pressure reducing valve No. 2; 63. Pneumatic valve No. 2; 64. Check valve No. 2; 7. Discharge ash conveying pipe; 8. Ash hopper; 81. Feed valve; 9. Return conveying pipe. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0019] Please see Figure 1 This utility model provides a bypass flue gas evaporation device, including a silo pump 1;

[0020] The top and bottom of the silo pump 1 are connected to the main purging pipe 2 via the top purging pipe 3 and the bottom purging pipe, respectively. The bottom purging pipe includes a bottom side purging pipe 4 and a bottom vertical purging pipe 5. The bottom side purging pipe 4 is connected to the bottom side of the silo pump 1, and the bottom vertical purging pipe 5 is connected to the bottom of the silo pump 1. Compressed air can be injected into the end of the main purging pipe 2 away from the silo pump 1. The compressed air can be compressed air from the main plant for ash conveying.

[0021] The bottom outlet of the silo pump 1 is connected to the right side of the discharge port and the discharge ash conveying pipe 7. The end of the discharge ash conveying pipe 7 away from the silo pump 1 is connected to the outlet flue of the evaporation tower. The discharge ash conveying pipe 7 is directly connected to the outlet flue of the evaporation tower. Compared with the original method of conveying to the ash silo, the ash conveying distance is greatly reduced, which not only reduces the implementation cost, but also reduces the risk of ash blockage in the pipe. At the same time, the waste heat (about 120°C) of the outlet flue of the evaporation tower can be used to dry the ash in a secondary way, preventing the ash from becoming damp and hardened.

[0022] The purging main pipe 2 is equipped with three valves from left to right: a manual valve 21, a pressure reducing valve 22, and a pneumatic valve 23. The manual valve 21 is normally open during operation and is closed and isolated when subsequent valves need to be inspected. The pressure reducing valve 22 reduces the pressure of the incoming purging gas to the required pressure. The pneumatic valve 23 is opened during purging and closed when purging stops.

[0023] The auxiliary blowing pipe 2 is connected to the discharge ash conveying pipe 7 by a discharge outlet auxiliary blowing pipe 6; the discharge outlet auxiliary blowing pipe 6 is equipped with valves from left to right, namely, a second manual valve 61, a second pressure reducing valve 62, a second pneumatic valve 63 and a second check valve 64. The second check valve 64 is to prevent gas backflow.

[0024] The silo pump 1 is equipped with a level switch LC, a pressure gauge FI, and a pressure transmitter FT; the level switch is used to provide feedback on the height of ash accumulation in the silo pump, and can automatically initiate the purging process after reaching the set height; the pressure gauge is used locally to observe the pressure in the silo pump; the pressure transmitter is used to remotely transmit pressure changes in the pipeline.

[0025] A feed valve 81 is installed between the silo pump 1 and the ash hopper 8. When the feed valve 81 is opened, the dust and other solids generated by the evaporation and crystallization of wastewater fall into the silo pump 1 through the ash hopper 8 at the bottom of the evaporation tower.

[0026] The top blowing pipe 3, the bottom side blowing pipe 4, and the bottom vertical blowing pipe 5 are all equipped with a No. 3 manual valve 31 and a No. 3 one-way valve 32.

[0027] The discharge ash conveying pipe 7 is equipped with a return conveying pipe 9. Multiple return conveying pipes 9 can be installed. When the right side of the discharge ash conveying pipe 7 is blocked, the valve on the return conveying pipe 9 at an appropriate position is opened to blow the blocked dust from the discharge port auxiliary blowing pipe 6 and the return conveying pipe 9 into the ash hopper. Then the valve on the return conveying pipe 9 is closed to blow away the dust at the blockage of the discharge ash conveying pipe 7 in batches. This method can reduce the amount of ash that needs to be blown away at the blockage of the discharge ash conveying pipe 7.

[0028] The working principle and usage process of this utility model are as follows: When the desulfurization wastewater bypass flue gas evaporation system is running, the feed valve 81 remains open. The dust and other solids generated by the evaporation and crystallization of the wastewater fall into the silo pump 1 through the ash hopper 8 at the bottom of the evaporation tower. When the ash accumulation in the silo pump 1 reaches the set height, the feed valve is closed, and the air source of the auxiliary blowing pipe 2 is turned on. Compressed air is used to thoroughly blow away the ash accumulation in the silo pump 1 through the top, bottom, side auxiliary blowing pipes 4 and the bottom vertical auxiliary blowing pipe 5. The solids are discharged through the ash discharge pipe 7 to the outlet flue of the evaporation tower. The ash is blown away using the negative pressure of the flue, and the residual heat of the flue is used to dry the ash for a second time to prevent moisture and caking. Then, the flue gas carrying crystals enters the flue before the electrostatic precipitator. The impurities are captured by the electrostatic precipitator, and the water vapor enters the desulfurization tower. The flue gas is discharged in compliance with standards. During this period, the components of the device need to be checked regularly to ensure stable operation. If the discharge ash conveying pipe 7 becomes blocked and the pipe pressure increases during the purging process, it is necessary to open the air source of the discharge port auxiliary blowing pipe 6, back-blown the discharge port of the silo pump, and strengthen the purging of the discharge ash conveying pipe 7 until the ash conveying pipe is unobstructed and the pressure drops to the normal value.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bypass flue gas evaporation device, comprising a chamber pump (1), characterized in that: The top and bottom of the silo pump (1) are connected to the main blowing pipe (2) through the top blowing pipe (3) and the bottom blowing pipe, respectively. The right side of the bottom outlet of the silo pump (1) is connected to the discharge ash conveying pipe (7). The end of the discharge ash conveying pipe (7) away from the silo pump (1) is connected to the outlet flue of the evaporator. The main blowing pipe (2) and the discharge ash conveying pipe (7) are connected to the outlet blowing pipe (6). The discharge ash conveying pipe (7) is equipped with a return conveying pipe (9).

2. The bypass flue gas evaporation device according to claim 1, characterized in that: The end of the blow-assisted main pipe (2) away from the chamber pump (1) is used to inject compressed air.

3. The bypass flue gas evaporation device according to claim 1, characterized in that: The blow-assisted main pipe (2) is equipped with a No. 1 manual valve (21), a No. 1 pressure reducing valve (22) and a No. 1 pneumatic valve (23).

4. The bypass flue gas evaporation device according to claim 1, characterized in that: The discharge port blowing pipe (6) is equipped with a No. 2 manual valve (61), a No. 2 pressure reducing valve (62), a No. 2 pneumatic valve (63), and a No. 2 check valve (64).

5. A bypass flue gas evaporation device according to claim 1, characterized in that: The silo pump (1) is equipped with a level switch LC, a pressure gauge FI and a pressure transmitter FT.

6. A bypass flue gas evaporation device according to claim 1, characterized in that: A feed valve (81) is provided between the silo pump (1) and the ash hopper (8).

7. A bypass flue gas evaporation device according to claim 1, characterized in that: The bottom blowing pipe includes a bottom side blowing pipe (4) and a bottom vertical blowing pipe (5). The bottom side blowing pipe (4) is connected to the bottom side of the silo pump (1), and the bottom vertical blowing pipe (5) is connected to the bottom of the silo pump (1).

8. A bypass flue gas evaporation device according to claim 7, characterized in that: The top blowing pipe (3), the bottom side blowing pipe (4), and the bottom vertical blowing pipe (5) are all equipped with a No. 3 manual valve (31) and a No. 3 one-way valve (32).

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