Wastewater evaporation system

Abstract

The invention relates to the field of wastewater treatment, in particular to a wastewater evaporation system. Comprising an evaporation tower, a gas inlet and a gas outlet are formed in the evaporation tower, the evaporation tower is vertically arranged, the gas inlet is located in the top of the evaporation tower, and the gas outlet is located in the lower portion of the evaporation tower; the top of the evaporation tower is communicated with an atomization spray gun, and the orientation of the atomization spray gun and the orientation of the gas inlet are arranged along the height direction of the evaporation tower. The wastewater evaporation system can solve the problem that the inner wall of the evaporation tower is prone to caking.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment, and in particular to a wastewater evaporation system. Background Art

[0002] Some wastewaters, such as desulfurization wastewater and shale gas return fluid generated by thermal power plants, contain water-insoluble sediments such as fine dust and mud. When treating them, direct filtration is inefficient and it is impossible to completely remove the sediments. Therefore, there is currently a method of first concentrating the wastewater and then drying the concentrated wastewater containing a large amount of sediment.

[0003] At present, there is a high-efficiency and energy-saving wastewater evaporation crystallizer as disclosed in application number 201610201606.0, which is provided with an evaporation tube inlet, an inlet flange, an inlet chamber, an inlet pneumatic baffle, an evaporation tube body, an outlet pneumatic baffle, an outlet chamber, an outlet flange and an evaporation tube outlet which are connected in sequence, a gas pipeline is connected to the evaporation tube inlet, the gas pipeline is connected to the flue between the denitration device and the air preheater, the evaporation tube outlet is connected to the dust collector inlet flue, a wastewater nozzle is provided in the evaporation tube body, and the wastewater nozzle is connected to the pretreated wastewater pipeline. When the concentrated wastewater is dried, the wastewater is sprayed in horizontally from the wastewater nozzle, and the high-temperature flue gas enters the evaporation crystallizer from the evaporation tube inlet, contacts with the sprayed wastewater, dries the wastewater, and obtains dry dust formed by precipitates, and part of the dry dust is discharged with the high-temperature flue gas, and part of the dry dust stays in the crystallizer away from the evaporation tube inlet.

[0004] However, the above-mentioned evaporation crystallizer has the following defects when in use: since the wastewater nozzle is arranged horizontally, the distance between the wastewater sprayed through the wastewater nozzle and the side wall of the evaporation crystallizer is relatively small, and some wastewater containing a large amount of sediment will inevitably fall on the inner wall of the evaporation crystallizer opposite to the wastewater nozzle. These wastewaters are dried under the high temperature of the high-temperature flue gas, and the sediment therein will adhere to the inner wall of the evaporation crystallizer. After a certain period of use, they will clump and be difficult to clean. If these clumps are not cleaned for a long time, they will continue to grow, causing the diameter of the evaporation crystallizer to become smaller, hindering the circulation of high-temperature flue gas. Summary of the invention

[0005] The present invention is intended to provide a wastewater evaporation system to solve the problem that the inner wall of the evaporation tower is prone to agglomeration.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a wastewater evaporation system, comprising an evaporation tower, which is provided with a gas inlet and a gas outlet, the evaporation tower is vertically arranged, the gas inlet is located at the top of the evaporation tower, and the gas outlet is located at the bottom of the evaporation tower; the top of the evaporation tower is connected to an atomizing spray gun, and the directions of the atomizing spray gun and the gas inlet are both arranged along the height direction of the evaporation tower.

[0007] The beneficial effects of this program are:

[0008] In this scheme, concentrated wastewater with sediment is sprayed into the evaporation tower from the atomizing spray gun and flows downward along the evaporation tower, and the high-temperature gas entering from the gas inlet also flows downward along the evaporation tower. Therefore, the high-temperature gas and the atomized wastewater in this scheme have the same flow direction. The high-speed high-temperature gas will carry the atomized wastewater downward, so the atomized wastewater is not easy to contact the inner wall of the evaporation tower, and the sediment in the wastewater will not adhere to the inner wall of the evaporation tower to form agglomerates.

[0009] Secondly, since the evaporation tower in this scheme is arranged vertically, the dry dust obtained after the wastewater is dried will continue to move downward under the action of gravity and flowing gas, and finally accumulate at the bottom of the evaporation tower or be discharged from the gas outlet with the gas, and will not settle in the middle of the evaporation tower. Therefore, the evaporation system in this scheme does not need to frequently clean the inner walls of the middle and lower parts of the evaporation tower when in use.

[0010] Furthermore, a mounting assembly is provided in the middle of the evaporation tower. The mounting assembly is ring-shaped, and the vertical cross-section is L-shaped.

[0011] The beneficial effect of this solution is that the installation assembly in this solution can install the evaporation tower on an external bracket or adjacent equipment or building, thereby improving the fixing effect of the evaporation tower.

[0012] Furthermore, the mounting assembly includes an upper ring plate, a lower ring plate and a plurality of rib plates. The upper ring plate and the lower ring plate are both sleeved on the outer wall of the evaporation tower. The plurality of rib plates are located between the upper ring plate and the lower ring plate and distributed along the circumference of the evaporation tower. The two ends of the rib plates are respectively fixed to the upper ring plate and the lower ring plate and are against the side wall of the evaporation tower.

[0013] The beneficial effects of this solution are as follows: the upper ring plate in this solution provides an installation position for connection with external brackets, etc., and the rib plate can support the upper ring plate and the lower ring plate, as well as the side wall of the evaporation tower, thereby improving the fixing strength.

[0014] Furthermore, the outer diameter of the lower ring plate is greater than the outer diameter of the upper ring plate, and a plurality of fixing holes are circumferentially arranged on the upper edge of the lower ring plate, and rib plates are provided on both sides of each fixing hole.

[0015] The beneficial effects of this solution are: the lower ring plate in this solution has a larger space and is more convenient to install.

[0016] Furthermore, a reinforcing plate is provided on the lower side of the lower ring plate and the upper side of the upper ring plate. The reinforcing plate is sleeved on the outer side of the evaporation tower and fixed to the lower ring plate or the upper ring plate.

[0017] The beneficial effect of this solution is that the reinforcing plate is fixed to the evaporation tower, which can increase the strength of the evaporation tower around the upper ring plate and the lower ring plate, and further avoid deformation of the evaporation tower.

[0018] Furthermore, the gas inlet is connected to a heat exchanger, and the heat exchanger is provided with a heat source inlet, a heat source outlet, a secondary air inlet and a secondary air outlet, and the secondary air outlet is connected to the gas inlet.

[0019] The beneficial effects of this scheme are as follows: when the heat source is a gas with certain pollution sources such as high-temperature flue gas, if the high-temperature flue gas is directly passed into the evaporation tower to dry the concentrated wastewater, the water vapor formed by the drying of the wastewater and the dry dust discharged with the high-temperature flue gas will be mixed into the high-temperature flue gas, which will have an adverse effect on the subsequent treatment of the high-temperature flue gas; and if the high-temperature flue gas is treated first and then passed into the evaporation tower, the heat in the high-temperature flue gas will also dissipate when the high-temperature flue gas is treated, resulting in low heat utilization and reduced drying effect.

[0020] The heat exchanger in this scheme uses the heat of high-temperature flue gas to heat the gas, and then passes the heated hot air into the evaporation tower to dry the wastewater. There is no pollution source in the hot air, so after drying, the mixed gas mixed with water vapor and dry dust is directly dedusted, and after the dry dust is collected, the water vapor and gas can be directly discharged. The high-temperature flue gas passing through the heat exchanger will not be mixed with other gases or dust, which is convenient for subsequent unified and centralized treatment.

[0021] Furthermore, a plurality of atomizing spray guns are provided, the gas inlet is coaxial with the evaporation tower, and the plurality of atomizing spray guns are evenly distributed along the circumference of the gas inlet.

[0022] The beneficial effect of this solution is that the atomizing spray gun in this solution can spray the concentrated wastewater evenly into the evaporation tower, so that the wastewater is more fully in contact with the high-temperature gas, thereby improving the drying effect.

[0023] Furthermore, a mounting bracket is provided on the top of the evaporation tower, and the atomizing spray gun is connected to the mounting bracket.

[0024] The beneficial effect of this solution is that the atomizing spray gun in this solution can be better installed on the evaporation tower through the mounting bracket.

[0025] Furthermore, a limit assembly is provided on the upper part of the evaporation tower, which includes a windproof ring and several connecting parts. The windproof ring is sleeved on the evaporation tower and fixedly connected to the evaporation tower. The several connecting parts are distributed along the circumference of the evaporation tower and fixed to the windproof ring.

[0026] The beneficial effects of this solution are: in order to ensure that the concentrated wastewater can be completely dried after moving downward to the lower part of the evaporation tower, the height of the evaporation tower needs to be more than 10 meters. The evaporation tower is large in size and is prone to shaking or rotating under the action of wind. The limiting assembly in this solution can limit the evaporation tower after being connected to the surrounding brackets, buildings, etc., to prevent the evaporation tower from rotating.

[0027] Furthermore, a closable manhole is provided at the lower part of the evaporation tower.

[0028] The beneficial effect of this solution is that when a fault occurs in the evaporation tower or too much dry dust accumulates at the bottom of the evaporation tower, the evaporation tower can be inspected and maintained and the accumulated dry dust can be removed by opening the manhole. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional diagram of an evaporation tower in an embodiment of the present invention;

[0030] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0031] Figure 3 Schematic diagram of a heat exchanger in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following is further described in detail through specific implementation methods:

[0033] The figure marks in the drawings of the specification include: evaporation tower 1, air inlet pipe 11, gas outlet 12, ash outlet 13, manhole 14, mounting bracket 2, atomizing spray gun 3, lower ring plate 4, fixing hole 41, upper ring plate 5, rib plate 6, reinforcement plate 7, windproof ring 8, connecting part 81, heat exchanger 9, heat source inlet 91, heat source outlet 92, secondary air inlet 93, secondary air outlet 94.

[0034] Example

[0035] The embodiment is basically as follows Figure 1 , Figure 2 and Figure 3 As shown, a wastewater evaporation system includes an installation component provided in the middle of an evaporation tower 1, the installation component includes an upper ring plate 5, a lower ring plate 4 and a plurality of rib plates 6, the upper ring plate 5 and the lower ring plate 4 are both annular, and the outer diameter of the lower ring plate 4 is larger than the outer diameter of the upper ring plate 5, the upper ring plate 5 and the lower ring plate 4 in this embodiment are both sleeved on the evaporation tower 1 and welded to the evaporation tower 1, the lower side of the lower ring plate 4 and the upper side of the upper ring plate 5 are both provided with a reinforcing plate 7, the reinforcing plate 7 is annular, the reinforcing plate 7 is sleeved on the evaporation tower 1 and welded to the evaporation tower 1, the top of the lower reinforcing plate 7 is welded to the lower ring plate 4, and the bottom of the upper reinforcing plate 7 is welded to the upper ring plate 5. A plurality of fixing holes 41 are provided on the lower ring plate 4 along the circumferential direction, and the rib plates 6 are distributed on both sides of the fixing holes 41, and the rib plates 6 are in the shape of a right-angled trapezoid, and the bottom, top and side wall of the rib plates 6 facing the evaporation tower 1 are welded to the lower ring plate 4, the upper ring plate 5 and the evaporation tower 1 respectively.

[0036] A limiting assembly is provided at the upper part of the evaporation tower 1, and the limiting assembly includes a windproof ring 8 and a plurality of connecting parts 81. The windproof ring 8 is annular and is sleeved on the evaporation tower 1. The windproof ring 8 is welded and fixed to the evaporation tower 1. The plurality of connecting parts 81 are evenly distributed along the circumference of the evaporation tower 1. The connecting part 81 in this embodiment is made of channel steel, one end of the connecting part 81 is welded to the connecting part 81, and the other end extends to a side away from the evaporation tower 1, and the end of the connecting part 81 away from the evaporation tower 1 is located on the outside of the windproof ring 8 along the vertical projection, and the connecting part 81 extends along the diameter direction of the evaporation tower 1.

[0037] The top of the evaporation tower 1 is provided with an opening, and a mounting bracket 2 is provided at the opening position. The mounting bracket 2 in this embodiment is in a well shape, and the mounting bracket 2 is installed on the evaporation tower 1 by bolts. A gas inlet is coaxially provided on the top of the evaporation tower 1. Specifically, the gas inlet is connected to an air intake pipe 11, and the air intake pipe 11 is connected to a heat exchanger 9. The heat exchanger 9 in this embodiment adopts the existing technology. The heat exchanger 9 includes a heat source inlet 91, a heat source outlet 92, a secondary air inlet 93 and a secondary air outlet 94. The air intake pipe 11 is connected to the secondary air outlet 94. Three atomizing spray guns 3 are vertically provided on the top of the evaporation tower 1, and the three atomizing spray guns 3 are evenly distributed along the circumference of the gas inlet, and the atomizing spray guns 3 are all installed on the mounting bracket 2.

[0038] The bottom of the evaporation tower 1 is funnel-shaped, and an ash outlet 13 is provided at the bottom of the evaporation tower 1, and an ash outlet 13 cover is provided to close the ash outlet 13. Specifically, the ash outlet 13 cover is connected to the ash outlet 13 by screws. A gas outlet 12 and a manhole 14 are provided at the lower part of the evaporation tower 1, and a manhole 14 cover is installed at the position of the manhole 14 by screws to close the manhole 14.

[0039] The specific implementation process is as follows:

[0040] When the compressed waste water is dried, the secondary air inlet 93 or the dust outlet can be connected to an external induced draft fan, or an air pump can be connected between the secondary air outlet 94 and the air inlet pipe 11 to encourage the air to enter the heat exchanger 9 through the secondary air inlet 93, then flow out from the secondary air outlet 94, and quickly enter the top of the evaporation tower 1 through the air inlet pipe 11, and finally flow out from the gas outlet 12. At this time, the gas outlet 12 is connected to an external dust removal device to filter the gas mixed with dry dust and collect the dry dust.

[0041] Taking high-temperature flue gas as a heat source as an example, in the above process, the high-temperature flue gas enters the heat exchanger 9 through the heat source inlet 91, heats the air entering through the secondary air inlet 93, and the high-temperature flue gas with reduced temperature is discharged from the heat source outlet 92, which is convenient for centralized treatment. The concentrated wastewater is sprayed evenly into the top of the evaporation tower 1 through three atomizing spray guns 3, contacts with the high-temperature air entering the gas inlet, and moves downward with the high-temperature air. During the downward movement, the water in the atomized wastewater gradually evaporates under the action of high temperature to form water vapor, and the precipitate in the wastewater forms powdery dry dust. The dry dust moves to the lower part of the evaporation tower 1 with the airflow, and the dry dust with larger particle size settles at the bottom of the evaporation tower 1, and the dry dust with relatively smaller particle size is discharged from the gas outlet 12 with the airflow.

[0042] When there is a lot of dry dust accumulated at the bottom of the evaporation tower 1, stop introducing high-temperature gas and atomized wastewater into the evaporation tower 1, and then open the ash outlet 13 to remove the accumulated dry dust. When a fault occurs in the evaporation tower 1, the manhole 14 is opened while stopping introducing high-temperature gas and atomized wastewater into the evaporation tower 1, and maintenance personnel enter the evaporation tower 1 through the manhole 14 for maintenance, and the manhole 14 can be closed after the maintenance is completed.

[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A wastewater evaporation system, comprising an evaporation tower, wherein the evaporation tower is provided with a gas inlet and a gas outlet, characterized in that: The evaporation tower is arranged vertically, the gas inlet is located at the top of the evaporation tower, and the gas outlet is located at the bottom of the evaporation tower; the top of the evaporation tower is connected to an atomizing spray gun, and the directions of the atomizing spray gun and the gas inlet are both arranged along the height direction of the evaporation tower.

2. A wastewater evaporation system according to claim 1, characterized in that: A mounting assembly is provided in the middle of the evaporation tower. The mounting assembly is ring-shaped, and the vertical cross section is L-shaped.

3. A wastewater evaporation system according to claim 2, characterized in that: The mounting assembly includes an upper ring plate, a lower ring plate and a plurality of rib plates, wherein the upper ring plate and the lower ring plate are both sleeved on the outer wall of the evaporation tower, the plurality of rib plates are located between the upper ring plate and the lower ring plate and are distributed along the circumference of the evaporation tower, and the two ends of the rib plates are respectively fixed to the upper ring plate and the lower ring plate and abut against the side wall of the evaporation tower.

4. A wastewater evaporation system according to claim 3, characterized in that: The outer diameter of the lower ring plate is greater than that of the upper ring plate. A plurality of fixing holes are circumferentially arranged on the upper edge of the lower ring plate, and rib plates are arranged on both sides of each fixing hole.

5. A wastewater evaporation system according to claim 4, characterized in that: A reinforcing plate is provided on the lower side of the lower ring plate and the upper side of the upper ring plate. The reinforcing plate is sleeved on the outer side of the evaporation tower and fixed to the lower ring plate or the upper ring plate.

6. A wastewater evaporation system according to claim 1, characterized in that: The gas inlet is connected to a heat exchanger, and the heat exchanger is provided with a heat source inlet, a heat source outlet, a secondary air inlet and a secondary air outlet, and the secondary air outlet is communicated with the gas inlet.

7. A wastewater evaporation system according to claim 1, characterized in that: A plurality of atomizing spray guns are provided, the gas inlet is coaxial with the evaporation tower, and the plurality of atomizing spray guns are evenly distributed along the circumference of the gas inlet.

8. A wastewater evaporation system according to claim 7, characterized in that: A mounting bracket is arranged on the top of the evaporation tower, and the atomizing spray gun is connected with the mounting bracket.

9. A wastewater evaporation system according to claim 1, characterized in that: A limit assembly is provided on the upper part of the evaporation tower, which includes a windproof ring and several connecting parts. The windproof ring is sleeved on the evaporation tower and fixedly connected to the evaporation tower. The several connecting parts are distributed along the circumference of the evaporation tower and fixed to the windproof ring.

10. A wastewater evaporation system according to claim 1, characterized in that: A closable manhole is provided at the lower part of the evaporation tower.

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