Multifunctional energy-saving system integrating water lifting and wastewater concentration

Abstract

The utility model discloses a multifunctional energy-saving system integrating water lifting and wastewater concentration, which comprises a multifunctional tower, a demisting area, a heat exchange area, a gas distribution and water return area and a wet desulphurization area are sequentially arranged in the multifunctional tower from top to bottom, and an exhaust port is arranged at the top of the multifunctional tower; the gas distribution and water return area is used for uniformly distributing desulfurized wet flue gas and collecting moisture condensed from the wet flue gas; a wastewater inlet of the wastewater circulating tank is connected with a high-chlorine industrial wastewater source, and a wastewater outlet of the wastewater circulating tank is connected with a wastewater inlet of the heat exchange area; a water inlet of the waste water cooling tower is connected with a waste water outlet of the heat exchange area, a water outlet of the waste water cooling tower is connected with a waste water circulating tank, and stirrers are arranged in the waste water circulating tank and the waste water circulating tank; the water inlet end of the recycling water tank is connected with the gas distribution and water return area, and the recycling water tank is used for storing condensate water collected by the gas distribution and water return area. According to the utility model, the comprehensive utilization of water and flue gas waste heat is realized, and the production cost is reduced while the energy consumption is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-chlorine industrial wastewater treatment, in particular to a multifunctional energy-saving system integrating water extraction and wastewater concentration. Background Art

[0002] With the rapid development of modern industry, the amount of high-chloride industrial wastewater (such as wet desulfurization wastewater and chemical water regeneration wastewater) generated by industries such as thermal power plants is increasing. These wastewaters contain high concentrations of inorganic salts and chloride ions. If discharged directly without effective treatment, they will cause serious environmental pollution. Therefore, the treatment and resource recovery of high-chloride industrial wastewater have become particularly important.

[0003] However, existing high-chloride industrial wastewater treatment technologies have significant defects. The typical treatment process includes multiple complex steps such as suspended solids removal, softening, concentration, thermal concentration, crystallized salt dehydration and drying, resulting in cumbersome operations and high process costs. In addition, these technologies require the consumption of large amounts of chemicals during the treatment process, further increasing operating costs. Even more disadvantageous is that existing technologies mainly focus on wastewater treatment, while ignoring the importance of resource recovery and comprehensive utilization, and fail to achieve the goals of waste reduction and resource utilization.

[0004] Therefore, there is an urgent need for a multifunctional energy-saving system that integrates water extraction and wastewater concentration. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a multifunctional energy-saving system integrating water extraction and wastewater concentration.

[0006] The utility model discloses a multifunctional energy-saving system integrating water extraction and wastewater concentration, comprising:

[0007] The multifunctional tower is equipped with a demisting area, a heat exchange area, an air distribution and water return area, and a wet desulfurization area from top to bottom, and an exhaust port is provided at the top; the air distribution and water return area is used to evenly distribute the wet flue gas after desulfurization and collect the water condensed from the wet flue gas;

[0008] A wastewater circulation box, whose wastewater inlet is connected to the high-chlorine industrial wastewater source, and whose wastewater outlet is connected to the wastewater inlet of the heat exchange zone, and both are equipped with a stirrer;

[0009] a wastewater cooling tower, the water inlet of which is connected to the wastewater outlet of the heat exchange zone, and the water outlet of which is connected to the wastewater circulation tank;

[0010] A recovery water tank, whose water inlet end is connected to the air distribution and water return area, is used to store condensed water collected in the air distribution and water return area.

[0011] As a further improvement of the present invention, the spacing between the demisting zone and the heat exchange zone is 1-1.5m, and the spacing between the heat exchange zone and the air distribution and return water zone is 6-7m.

[0012] As a further improvement of the present invention, the demisting area includes a ridge-type demister, which is installed in the multifunctional tower and is used to remove water droplets carried in the wet flue gas after cooling.

[0013] As a further improvement of the present invention, the heat exchange zone includes a heat exchanger, which is installed in the multifunctional tower and is used to reduce the temperature of the wet flue gas and heat the high-chloride industrial wastewater;

[0014] The wastewater inlet of the heat exchanger is connected to the wastewater outlet of the wastewater circulation box, and the wastewater outlet of the heat exchanger is connected to the water inlet of the wastewater cooling tower.

[0015] As a further improvement of the present invention, the air distribution and water return area includes a water collecting tray, which is provided with a plurality of through holes for wet flue gas circulation, and each through hole is fixed with an air riser upward in the vertical direction, and the top of the air riser is provided with a tower cap;

[0016] The water collecting tray is also provided with a drainage hole for discharging condensed water, and the drainage hole is connected to the water inlet end of the recovery water tank.

[0017] As a further improvement of the present invention, the height of the riser is not less than 1 m, and the diameter of the through hole is not less than 500 mm.

[0018] As a further improvement of the present invention, the wastewater cooling tower is an open cooling tower.

[0019] As a further improvement of the present invention, the wet flue gas flow rate in the multifunctional tower is 3-4.5 m / s.

[0020] As a further improvement of the present invention, it further comprises a wastewater circulation pump, which is arranged between the wastewater outlet of the wastewater circulation box and the wastewater inlet of the heat exchange zone.

[0021] As a further improvement of the present invention, it also includes a recovery water pump, which is arranged at the water outlet of the recovery water tank and is used to transport the condensed water in the recovery water tank to a designated water use point.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The utility model has a simple structure and is easy to operate. By utilizing high-chlorine industrial wastewater as circulating water, a two-stage heat exchange method of "gas-liquid heat exchange in a multifunctional tower + wastewater cooling tower heat exchange" is adopted. In the first stage, the flue gas is cooled by indirect gas-liquid heat exchange while the moisture in the wet flue gas is collected to realize the water extraction function; in the second stage, the temperature of the high-chlorine industrial wastewater is further reduced by the wastewater cooling tower, while the purpose of wastewater reduction and concentration is achieved, thereby realizing the comprehensive utilization of water and flue gas waste heat, saving energy consumption and reducing production costs.

[0024] The utility model does not need to perform softening treatment on high-chlorine industrial wastewater, thus saving chemicals, reducing costs and also avoiding pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a multifunctional energy-saving system integrating water extraction and wastewater concentration disclosed in an embodiment of the present utility model;

[0026] Figure 2 The present invention is a schematic structural diagram of a multifunctional tower of a multifunctional energy-saving system integrating water extraction and wastewater concentration disclosed in one embodiment of the present invention.

[0027] In the picture:

[0028] 1. Multifunctional tower; 11. Tower body; 12. Wet desulfurization zone; 13. Gas distribution and water return zone; 131. Water collecting tray; 132. Through hole; 133. Riser; 134. Tower cap; 14. Heat exchange zone; 15. Demisting zone; 16. Exhaust port; 2. Wastewater cooling tower; 3. Wastewater circulation tank; 4. Agitator; 5. Wastewater circulation pump; 6. Recovery water tank; 7. Recovery water pump. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are 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 shall fall within the scope of protection of the present invention.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] The present invention is described in further detail below with reference to the accompanying drawings:

[0033] like Figure 1-2 As shown, according to the utility model, a multifunctional energy-saving system integrating water extraction and wastewater concentration is provided, which includes a multifunctional tower 1, a wastewater cooling tower 2, a wastewater circulation box 3, and a recovery water tank 6. Among them, the multifunctional tower 1 is provided with a demisting area 15, a heat exchange area 14, an air distribution and return water area 13 and a wet desulfurization area 12 from top to bottom, and an exhaust port 16 is provided at the top; the air distribution and return water area 13 is used to evenly distribute the wet flue gas after desulfurization and collect the moisture condensed from the wet flue gas. ; The wastewater inlet of the wastewater circulation box 3 is connected to the high-chlorine industrial wastewater source, the wastewater outlet of the wastewater circulation box 3 is connected to the wastewater inlet of the heat exchange area 14, and an agitator 4 is provided in the wastewater circulation box 3; the water inlet of the wastewater cooling tower 2 is connected to the wastewater outlet of the heat exchange area 14, and the water outlet of the wastewater cooling tower 2 is connected to the wastewater circulation box 3; the water inlet end of the recovery water tank 6 is connected to the air distribution and return water area 13, and the recovery water tank 6 is used to store the condensed water collected in the air distribution and return water area 13.

[0034] In the above embodiment, the structure is simple and the operation is convenient. By utilizing high-chloride industrial wastewater as circulating water, a two-stage heat exchange method of "heat exchange between gas and liquid in the multifunctional tower 1 + heat exchange in the wastewater cooling tower 2" is adopted. In the first stage, the flue gas is cooled by indirect gas-liquid heat exchange while the purpose of collecting moisture in the wet flue gas is achieved to realize the water extraction function; in the second stage, the temperature of the high-chloride industrial wastewater is further reduced by the wastewater cooling tower 2, while achieving the purpose of wastewater reduction and concentration, realizing the comprehensive utilization of water and flue gas waste heat, saving energy consumption and reducing production costs; and the utility model does not need to soften the high-chloride industrial wastewater, saving chemicals, reducing costs and avoiding pollution to the environment.

[0035] Specifically:

[0036] like Figure 1-2 As shown, in the above embodiment, preferably, the spacing between the demisting area 15 and the heat exchange area 14 is 1-1.5 m, and the spacing between the heat exchange area 14 and the air distribution and return water area 13 is 6-7 m.

[0037] In the above embodiment, preferably, the demisting area 15 includes a ridge-type demister installed in the multifunctional tower 1, which is used to remove water droplets carried in the wet flue gas after cooling.

[0038] In the above embodiment, heat exchange zone 14 preferably includes a heat exchanger installed within multifunctional tower 1. This heat exchanger is used to reduce the temperature of the wet flue gas and heat the high-chloride industrial wastewater. In this embodiment, the wet flue gas after wet desulfurization serves as a heat source to heat the high-chloride industrial wastewater in the heat exchanger, eliminating the need for an external heat source and saving energy. The wastewater inlet of the heat exchanger is connected to the wastewater outlet of the wastewater circulation tank 3, which in turn is connected to the water inlet of the wastewater cooling tower 2.

[0039] In the above embodiment, the air distribution and water return area 13 preferably includes a water collection tray 131, which is provided with multiple through-holes 132 for the circulation of wet flue gas. Each through-hole 132 is vertically secured to an air riser 133, with a cap 134 positioned on top of each riser 133. The water collection tray 131 also has a drain hole for discharging condensed water, which is connected to the water inlet of the recovery water tank 6. The provision of the cap 134 in this embodiment prevents collected water from entering the wet flue gas desulfurization zone at the bottom through the through-holes.

[0040] In the above embodiment, preferably, the height of the riser 133 is not less than 1 m, and the aperture of the through hole 132 is not less than 500 mm; in this embodiment, the through hole 132 and the riser 133 can be connected by welding.

[0041] In the above embodiment, preferably, the wastewater cooling tower 2 is an open cooling tower. The high-chlorine industrial wastewater heated by the heat exchanger enters the open cooling tower and realizes vapor-liquid separation under low pressure. The water vapor evaporated by the open cooling tower enters the environment, and the concentrated liquid at the bottom of the open cooling tower enters the wastewater circulation box 3. In order to avoid the precipitation of the concentrated liquid entering the wastewater circulation box 3, an agitator 4 is installed in the wastewater circulation box 3 in this embodiment.

[0042] In the above embodiment, preferably, the wet flue gas flow velocity in the multifunctional tower 1 is 3-4.5 m / s.

[0043] In the above embodiment, preferably, a wastewater circulation pump 5 is further included, which is arranged between the wastewater outlet of the wastewater circulation box 3 and the wastewater inlet of the heat exchange area 14 .

[0044] In the above embodiment, preferably, a recovery water pump 7 is further included, which is arranged at the water outlet of the recovery water tank 6 and is used to transport the condensed water in the recovery water tank 6 to a designated water use point.

[0045] In the above embodiment, preferably, the wet desulfurization zone in the multifunctional tower 1 is an existing structure, which will not be described in detail here.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multifunctional energy-saving system integrating water extraction and wastewater concentration, characterized in that: include: A multifunctional tower (1) is provided with a demisting area (15), a heat exchange area (14), an air distribution and water return area (13), and a wet desulfurization area (12) in order from top to bottom, and an exhaust port (16) is provided at the top; the air distribution and water return area (13) is used to evenly distribute the wet flue gas after desulfurization and collect the moisture condensed from the wet flue gas; A wastewater circulation box (3) has a wastewater inlet connected to a high-chlorine industrial wastewater source, and a wastewater outlet connected to the wastewater inlet of the heat exchange zone (14); and an agitator (4) is provided therein; A wastewater cooling tower (2), the water inlet of which is connected to the wastewater outlet of the heat exchange zone (14), and the water outlet of which is connected to the wastewater circulation box (3); A water recovery tank (6) has a water inlet connected to the air distribution and water return area (13) and is used to store condensed water collected by the air distribution and water return area (13).

2. The multifunctional energy-saving system according to claim 1, characterized in that: The spacing between the demisting area (15) and the heat exchange area (14) is 1-1.5 m, and the spacing between the heat exchange area (14) and the air distribution and water return area (13) is 6-7 m.

3. The multifunctional energy-saving system according to claim 1, characterized in that: The demisting area (15) includes a ridge-type demister, which is installed in the multifunctional tower (1) and is used to remove water droplets carried in the wet flue gas after cooling.

4. The multifunctional energy-saving system according to claim 1, characterized in that: The heat exchange zone (14) includes a heat exchanger, which is installed in the multifunctional tower (1) and is used to reduce the temperature of the wet flue gas and heat the high-chlorine industrial wastewater; The wastewater inlet of the heat exchanger is connected to the wastewater outlet of the wastewater circulation box (3), and the wastewater outlet of the heat exchanger is connected to the water inlet of the wastewater cooling tower (2).

5. The multifunctional energy-saving system according to claim 1, characterized in that: The air distribution and water return area (13) includes a water collecting tray (131), the water collecting tray (131) is provided with a plurality of through holes (132) for wet flue gas to circulate, and an air riser (133) is fixed vertically upward at each of the through holes (132), and a tower cap (134) is provided on the top of the air riser (133); The water collecting tray (131) is also provided with a drainage hole for draining condensed water, and the drainage hole is connected to the water inlet end of the recovery water tank (6).

6. The multifunctional energy-saving system according to claim 5, characterized in that: The height of the riser (133) is not less than 1 m, and the diameter of the through hole (132) is not less than 500 mm.

7. The multifunctional energy-saving system according to claim 1, characterized in that: The wastewater cooling tower (2) is an open cooling tower.

8. The multifunctional energy-saving system according to claim 1, characterized in that: The wet flue gas flow rate in the multifunctional tower (1) is 3-4.5 m / s.

9. The multifunctional energy-saving system according to claim 1, characterized in that: It also includes a wastewater circulation pump (5), which is arranged between the wastewater outlet of the wastewater circulation box (3) and the wastewater inlet of the heat exchange area (14).

10. The multifunctional energy-saving system according to claim 1, characterized in that: It also includes a recovery water pump (7), which is arranged at the water outlet of the recovery water tank (6) and is used to transport the condensed water in the recovery water tank (6) to a designated water point.

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