A concentrated brine and combined drainage water joint treatment system and method

Abstract

The application discloses a concentrated brine and combined drainage water joint treatment system and method, which comprises a combined drainage water inlet pipeline, an ejector, a concentrated brine inlet pipeline, a flue inlet pipeline, a horizontal flue and a movable baffle; the outlet of the combined drainage water inlet pipeline is in communication with the high-pressure fluid inlet of the ejector, the outlet of the concentrated brine inlet pipeline is in communication with the low-pressure fluid inlet of the ejector, the converging-diverging nozzle of the ejector is in communication with one end of the flue inlet pipeline, the other end of the flue inlet pipeline is inserted into the horizontal flue, the movable baffle is located in the horizontal flue, the movable baffle is located below the flue inlet pipeline, and the movable baffles are inclinedly distributed; the system can realize the treatment of the concentrated brine, does not need to lay a bypass flue and avoids the additional consumption of flue gas heat.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sewage treatment, and relates to a concentrated salt water and continuous drainage combined treatment system and method. BACKGROUND

[0002] In the process of coal mining, an industrial wastewater, i.e. mine concentrated salt water, will inevitably be produced. The treatment and comprehensive utilization of the mine concentrated salt water can not only avoid the pollution to the water environment, but also prevent the waste of water resources.

[0003] A coal mine matched with a 2x1,000 MW unit of a power plant produces about 8,000 tons of mining wastewater per year, and the main harmful substances in the wastewater are Na2SO4, NaCl and NaNO3. At present, the concentrated mother liquor of the wastewater needs to be treated, and the general chemical method has high cost and a complex treatment process.

[0004] At present, the existing technology has made a lot of treatment methods for the salt-containing wastewater of a power plant, and several typical main process methods include 1, pretreatment of salt-containing wastewater + membrane filtration device + drying. 2, pretreatment of wastewater + evaporation crystallization + drying. 3, salt concentration process, nanofiltration system salt separation + evaporation crystallization + drying. 4, high-temperature flue gas evaporation process.

[0005] In the method for treating the salt-containing wastewater by flue gas evaporation, a bypass flue gas method is generally used, a part of flue gas is introduced into a drying tower from the flue gas, and the salt-containing wastewater is sprayed into the drying tower by an atomizing device. After evaporation, most of the solid particles are settled to the ash storage bin below the drying tower, and a small amount of solid particles is sent into the dust collector with the flue gas, which consumes additional flue gas heat. SUMMARY

[0006] The present application aims to overcome the above-mentioned shortcomings of the prior art, and provides a concentrated salt water and continuous drainage combined treatment system and method, which can realize the treatment of concentrated salt water without laying a bypass flue gas, thereby avoiding the consumption of additional flue gas heat.

[0007] To achieve the above-mentioned purpose, the concentrated salt water and continuous drainage combined treatment system and method comprises a continuous drainage inlet pipeline, an ejector, a concentrated salt water inlet pipeline, a flue gas inlet pipeline, a horizontal flue gas and a movable baffle.

[0008] The outlet of the continuous drainage inlet pipeline is in communication with the high-pressure fluid inlet of the ejector, the outlet of the concentrated salt water inlet pipeline is in communication with the low-pressure fluid inlet of the ejector, the tapered nozzle of the ejector is in communication with one end of the flue gas inlet pipeline, the other end of the flue gas inlet pipeline is inserted into the horizontal flue gas, and the movable baffle is located in the horizontal flue gas. The movable baffle is located below the flue gas inlet pipeline, and the movable baffle is inclined.

[0009] The continuous drainage inlet pipe is provided with a continuous drainage inlet valve.

[0010] The concentrated brine inlet pipe is provided with a concentrated brine inlet valve.

[0011] The inner wall of the bottom of the horizontal flue is provided with an anti-corrosion layer, and the movable baffle is close to the anti-corrosion layer.

[0012] The bottom of the horizontal flue is provided with a dust discharge port below the movable baffle, and the bottom of the horizontal flue is provided with a dust discharge port upper door, wherein the dust discharge port upper door is located above the dust discharge port.

[0013] Further comprising a dust storage bin, and the dust discharge port is communicated with an inlet of the dust storage bin.

[0014] A dust discharge port lower door is arranged at an outlet of the dust storage bin.

[0015] The lower end of the movable baffle is hinged to the dust discharge port upper door, and the middle part of the lower surface of the movable baffle is provided with a plurality of levers hinged between the lower surface of the movable baffle and the inner wall of the horizontal flue.

[0016] In the working condition, the dust discharge port upper door covers the dust discharge port, and at this time, the working medium discharged from the flue inlet pipe is blocked by the movable baffle;

[0017] In the blowing condition, the dust discharge port upper door is away from the dust discharge port, and at this time, the working medium discharged from the flue inlet pipe is directly blown into the dust discharge port.

[0018] The end of the dust discharge port upper door is provided with a roller, the top of the dust storage bin is provided with a boss, and the roller is located on the boss and moves on the boss to pull the dust discharge port upper door to move.

[0019] The concentrated brine and continuous drainage combined treatment method comprises the following steps:

[0020] a. Ejection process: the continuous drainage is injected into the high-pressure fluid inlet of the ejector as a high-temperature and high-pressure fluid, and the concentrated brine at normal temperature and pressure is injected into the induced fluid inlet of the ejector as an induced fluid, the two fluids are mixed to form a medium-temperature and medium-pressure fluid, the pressure is reduced after passing through the converging nozzle, the fluid is expanded from liquid to gas flow carrying crystalline salt particles, and the flow rate is increased; the opening degrees of the continuous drainage inlet valve and the concentrated brine inlet valve are adjusted to control the flow rates of the two fluids, so that the temperature of the fluid in the flue inlet pipe (7) is controlled;

[0021] b. The movement process of the movable baffle: in order to make the crystalline salt particles in the steam uniformly mixed with the flue gas so as to facilitate the normal work of the dust collector, the movable baffle plays a role of disturbing flow, and the steam and the flue gas form convection; when the movable baffle surface is accumulated to a certain degree, the roller pulls the ash outlet upper door to move on the boss, the ash outlet upper door is opened, and the movable baffle is driven under the traction of the lever, the movable baffle surface is downward and the accumulated ash falls into the ash storage bin; when the movable baffle surface is cleaned, the roller pulls the ash outlet upper door to move in the opposite direction, and the movable baffle is driven under the traction of the lever, and the movable baffle returns to the original position; when the ash storage bin is full, the ash outlet lower door is opened to discharge the accumulated ash.

[0022] The present application has the following beneficial effects:

[0023] The concentrated brine and continuous drainage combined treatment system and method adopt an ejector to evaporate the concentrated brine by using the energy of the continuous drainage, avoid the reduction of the flue gas temperature in the flue, and save the auxiliary heating equipment in the flue, that is, avoid laying a bypass flue. In addition, it should be noted that the concentrated brine is evaporated by using the energy of the continuous drainage without using a nozzle atomization, and there is no risk of fouling and plugging of the spraying equipment. Meanwhile, the movable baffle is used in the turbulence device, and compared with the fixed turbulence device, the movable baffle can remove the accumulated ash on the turbulence device during operation without shutdown and treatment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present application;

[0025] Figure 2 It is a position diagram of the movable baffle 5 under working conditions;

[0026] Figure 3 It is a position diagram of the movable baffle 5 under blowing ash conditions;

[0027] Figure 4 It is a position diagram of the movable baffle 5 under ash removal conditions;

[0028] Figure 5 It is a movement schematic diagram of the ash outlet upper door 601.

[0029] 1 is an ejector, 101 is a continuous drainage inlet pipeline, 102 is a concentrated brine inlet pipeline, 201 is a continuous drainage inlet valve, 202 is a concentrated brine inlet valve, 3 is a horizontal flue, 301 is a boss, 4 is an anti-corrosion layer, 5 is a movable baffle, 601 is an ash outlet upper door, 602 is an ash storage bin, 603 is an ash outlet lower door, 604 is a roller, 7 is a flue inlet pipeline, and 8 is a converging nozzle. DETAILED DESCRIPTION

[0030] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.

[0031] The structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These drawings are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0032] With reference to Figure 1 , the combined treatment system of concentrated brine and continuous drainage water includes an ejector 1, a continuous drainage water inlet pipeline 101, a concentrated brine inlet pipeline 102, a continuous drainage water inlet valve 201, a concentrated brine inlet valve 202, a horizontal flue 3, a boss 301, an anti-corrosion layer 4, a movable baffle 5, an upper ash discharge door 601, an ash storage bin 602, a lower ash discharge door 603, a roller 604, a flue inlet pipeline 7 and a converging nozzle 8;

[0033] The outlet of the continuous drainage water inlet pipeline 101 is in communication with the high-pressure fluid inlet of the ejector 1, and the continuous drainage water inlet valve 201 is arranged on the continuous drainage water inlet pipeline 101. The outlet of the concentrated brine inlet pipeline 102 is in communication with the low-pressure fluid inlet of the ejector 1, and the concentrated brine inlet valve 202 is arranged on the concentrated brine inlet pipeline 102. The converging nozzle 8 of the ejector 1 is in communication with one end of the flue inlet pipeline 7, and the other end of the flue inlet pipeline 7 is inserted into the horizontal flue 3. The movable baffle 5 is located in the horizontal flue 3 and below the flue inlet pipeline 7. The inner wall of the bottom of the horizontal flue 3 is provided with the anti-corrosion layer 4, and the movable baffle 5 is in close contact with the anti-corrosion layer 4. The bottom of the horizontal flue 3 is provided with an ash discharge port, which is below the movable baffle 5 and in communication with the inlet of the ash storage bin 602. The outlet of the ash storage bin 602 is provided with the lower ash discharge door 603.

[0034] With reference to Figure 2 , Figure 3 and Figure 4The bottom of the horizontal flue 3 is provided with an ash outlet upper door 601, the movable baffle 5 is obliquely distributed, and the lower end of the movable baffle 5 is hinged to the ash outlet upper door 601; the middle part of the lower surface of the movable baffle 5 is provided with a plurality of levers between the inner wall of the horizontal flue 3, one end of the lever is hinged to the lower surface of the movable baffle 5, and the other end of the lever is hinged to the inner wall of the horizontal flue 3; the angle between the lever and the movable baffle 5 is adjusted to adjust the inclination of the movable baffle 5, and the position of the ash outlet upper door 601 is adjusted, that is, the ash outlet upper door 601 covers the ash outlet or the ash outlet upper door 601 does not cover the ash outlet; in the working condition, the ash outlet upper door 601 covers the ash outlet, and the angle between the movable baffle 5 and the bottom of the horizontal flue 3 is 40-45°, at this time, the working medium discharged from the flue inlet pipe 7 is shielded by the movable baffle 5; in the blowing condition, the ash outlet upper door 601 does not cover the ash outlet, and the angle between the movable baffle 5 and the bottom of the horizontal flue 3 is 55-65°, at this time, the working medium discharged from the flue inlet pipe 7 is not shielded by the movable baffle 5, but directly blown into the ash outlet.

[0035] Preferably, referring to Figure 5 The end of the ash outlet upper door 601 is provided with a roller 604, the top of the ash storage bin 602 is provided with a boss 301, the roller 604 is located on the boss 301, and the ash outlet upper door 601 is moved left and right by moving the roller 604 on the boss 301; in the blowing condition, the ash outlet upper door 601 is pulled to open the ash outlet, the ash outlet lower door 603 remains closed, the movable baffle 5 moves with the ash outlet upper door 601, so that the upper surface of the movable baffle 5 faces the obliquely downward direction, under the joint action of steam and flue gas, the ash on the upper surface of the movable baffle 5 is washed into the ash storage bin 602, after the blowing condition ends, the ash outlet upper door 601 is reversely moved to close the ash outlet through the ash outlet upper door 601, and the movable baffle 5 is reversely moved so that the upper surface of the movable baffle 5 faces the flue inlet pipe 7, then the ash outlet lower door 603 can be opened to discharge the ash in the ash storage bin 602.

[0036] The nozzle in the ejector 1 is a converging-diverging nozzle 8, and the fluid at the outlet of the ejector 1 must be fully expanded into superheated steam, the temperature of which is higher than the temperature of the flue gas in the horizontal flue 3 and the temperature difference is not more than 5℃.

[0037] The method for combined treatment of concentrated brine and continuous drainage water provided by the application comprises the following steps:

[0038] The high-temperature and high-pressure waste water is used as an injection fluid to drive the normal-temperature and normal-pressure static concentrated salt water, two fluids are mixed after being accelerated by a nozzle, and then are fully expanded after a converging nozzle 8 to form a water vapor flow carrying the impurity salt crystal particles, and the water vapor flow is sent into the horizontal flue 3 through the flue inlet pipeline 7; the water vapor flow output by the flue inlet pipeline 7 is blocked by the movable baffle 5 to form a converging flow, the converging flow is opposite to the flow direction of the flue gas in the horizontal flue 3 to form a convection, so that the fly ash in the flue gas and the impurity salt crystals in the steam are strongly mixed to facilitate the treatment of the impurity salt and the fly ash together in the subsequent dust collector.

[0039] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced by the equivalent, without departing from the spirit and scope of the present application, any modification or equivalent replacement should be covered within the protection scope of the claims of the present application.

Claims

1. A concentrated brine and continuous drainage combined treatment system, characterized in that: It comprises a drainage inlet pipe (101), an ejector (1), a concentrated brine inlet pipe (102), a flue inlet pipe (7), a horizontal flue (3) and a movable baffle (5); The outlet of the drainage inlet pipe (101) is connected to the high-pressure fluid inlet of the ejector (1), the outlet of the concentrated brine inlet pipe (102) is connected to the low-pressure fluid inlet of the ejector (1), the convergent nozzle (8) of the ejector (1) is connected to one end of the flue inlet pipe (7), the other end of the flue inlet pipe (7) is inserted into the horizontal flue (3), the movable baffle (5) is located in the horizontal flue (3), the movable baffle (5) is located below the flue inlet pipe (7), and the movable baffle (5) is distributed obliquely.

2. The concentrated brine and continuous drainage combined treatment system according to claim 1, characterized in that: The continuous and drainage inlet pipe (101) is provided with a continuous and drainage inlet valve (201).

3. The concentrated brine and continuous drainage combined treatment system according to claim 1, characterized in that: The concentrated brine inlet pipe (102) is provided with a concentrated brine inlet valve (202).

4. The concentrated brine and continuous drainage combined treatment system according to claim 1, characterized in that: An anti-corrosion layer (4) is provided on the inner wall of the bottom of the horizontal flue (3), and the movable baffle (5) is in close contact with the anti-corrosion layer (4).

5. The concentrated brine and continuous drainage combined treatment system according to claim 1, characterized in that: An ash discharge port is provided at the bottom of the horizontal flue (3), and the ash discharge port is located below the movable baffle (5). An ash discharge port upper door (601) is provided at the bottom of the horizontal flue (3), wherein the ash discharge port upper door (601) is located above the ash discharge port.

6. The concentrated brine and continuous drainage combined treatment system according to claim 5, characterized in that: It also includes an ash storage bin (602), and the ash discharge port is connected to the inlet of the ash storage bin (602).

7. The concentrated brine and continuous drainage combined treatment system according to claim 6, characterized in that: An ash discharge lower door (603) is provided at the outlet of the ash storage bin (602).

8. The concentrated brine and continuous drainage combined treatment system according to claim 6, characterized in that: The lower end of the movable baffle (5) is hinged to the upper door (601) of the ash discharge port, and a plurality of levers are provided between the middle of the lower surface of the movable baffle (5) and the inner wall of the horizontal flue (3), wherein one end of the lever is hinged to the lower surface of the movable baffle (5), and the other end of the lever is hinged to the inner wall of the horizontal flue (3).

9. The concentrated brine and continuous drainage combined treatment system according to claim 8, characterized in that: Under working conditions, the ash discharge port upper door (601) covers the ash discharge port, and the working medium discharged from the flue inlet pipe (7) is blocked by the movable baffle (5); In the soot blowing condition, the ash discharge port upper door (601) leaves the ash discharge port, and the working medium discharged from the flue inlet pipe (7) is directly blown into the ash discharge port; A roller (604) is provided at the end of the ash discharge port upper door (601), a boss (301) is provided at the top of the ash storage bin (602), and the roller (604) is located on the boss (301). The roller (604) moves on the boss (301) to pull the ash discharge port upper door (601) to move.

10. A method for combined treatment of concentrated brine and continuous drainage, characterized in that: The concentrated brine and drainage combined treatment system according to claim 9 comprises: a. Injection process: The continuous drainage water is injected into the high-pressure fluid inlet of the ejector (1) as a high-temperature and high-pressure fluid, and the concentrated brine at room temperature and pressure is injected into the ejected fluid inlet of the ejector (1) as an ejected fluid. The two fluids are mixed to form a medium-temperature and medium-pressure fluid. After passing through the converging nozzle (8), the pressure drops, and the fluid expands from a liquid state into an airflow carrying crystallized salt particles, while the flow rate increases. The openings of the continuous drainage water inlet valve (201) and the concentrated brine water inlet valve (202) are adjusted to control the flow rates of the two fluids, thereby achieving control of the fluid temperature in the flue inlet pipe (7); b. Movement process of the movable baffle (5): In order to make the crystallized salt particles in the steam and the flue gas uniformly mixed so as to facilitate the normal operation of the dust collector, the movable baffle (5) plays a turbulent role, and the steam and the flue gas form convection; when the dust on the surface of the movable baffle (5) reaches a certain level, the roller (604) pulls the ash discharge port upper door (601) to move on the boss, and the ash discharge port upper door (601) is opened. At the same time, the movable baffle (5) moves with the traction of the lever, and the surface of the movable baffle (5) faces downward and the accumulated dust falls into the ash storage bin (602); when the surface of the movable baffle (5) is blown clean, the roller (604) pulls the ash discharge port upper door (601) to move in the opposite direction, and at the same time, the movable baffle (5) moves with the traction of the lever, and the movable baffle (5) returns to its original position; when the ash storage bin (602) is full, the ash discharge port lower door (603) is opened to discharge the accumulated dust.

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