CN212800006U - Wet flue gas desulfurization waste water decrement reduces discharging system - Google Patents
Wet flue gas desulfurization waste water decrement reduces discharging system Download PDFInfo
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- CN212800006U CN212800006U CN202021105041.4U CN202021105041U CN212800006U CN 212800006 U CN212800006 U CN 212800006U CN 202021105041 U CN202021105041 U CN 202021105041U CN 212800006 U CN212800006 U CN 212800006U
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Abstract
The utility model provides a wet flue gas desulfurization waste water decrement emission reduction system, include: the gypsum rotational flow station comprises a plurality of rotational flow pieces, a gypsum rotational flow station outlet I and a gypsum rotational flow station outlet II, wherein the gypsum rotational flow station outlet I is arranged below the gypsum rotational flow station, and the gypsum rotational flow station outlet II is arranged on one side of the gypsum rotational flow station and is communicated with the desulfurization absorption tower; the vacuum belt conveyor is arranged below the first outlet of the gypsum rotational flow station, a vacuum groove of the vacuum belt conveyor is of a sectional type and is divided into a main water separation section and a secondary water separation section through a vacuum groove partition plate, and two gypsum cake industrial water washing nozzles are arranged above the secondary water separation section; the gypsum dehydration filtrate tank is divided into a first chamber and a second chamber by a partition plate, the first chamber is communicated with the main water separation section by an outer water discharge pipeline, and the second chamber is communicated with the secondary water separation section by an outer water discharge pipeline. The utility model has the characteristics of simple structure, effectively reduce chemical treatment, zero release, operation maintenance cost are low.
Description
Technical Field
The utility model belongs to the technical field of energy and environmental engineering, a wet flue gas desulfurization waste water decrement emission reduction system is related to.
Background
The wastewater treatment capacity of wet desulphurization is huge, and certain factors influence the wastewater to be difficult to treat and control, so that the discharge and dehydration of slurry in an absorption tower and the control of chloride ion concentration are influenced, and the safe and economic operation of desulphurization is indirectly influenced. The design of a general desulfurization wastewater treatment system and the conventional thermal power plants are simple in consideration of subsequent treatment factors of desulfurization wastewater, and only the overflow of a gypsum cyclone station is used as a part of wastewater for subsequent treatment, so that the conventional desulfurization wastewater treatment capacity is huge, and the solid content is large, and great difficulty is brought to methods such as subsequent chemical treatment or zero discharge, in-flue evaporation and the like.
To sum up, for solving the technical not enough of current gypsum dewatering system, the utility model designs a simple structure, effectively reduce chemical treatment, zero release, the wet flue gas desulfurization waste water decrement emission reduction system that the operation maintenance cost is low.
Disclosure of Invention
The utility model provides a wet desulphurization waste water decrement emission reduction system with simple structure, effective reduction of chemical treatment, zero discharge and low operation and maintenance cost for solving the problems existing in the prior art.
The purpose of the utility model can be realized by the following technical proposal:
a wet desulphurization waste water reduction and emission reduction system comprises:
the gypsum rotational flow station comprises a plurality of rotational flow pieces, a gypsum rotational flow station outlet I and a gypsum rotational flow station outlet II, wherein the gypsum rotational flow station outlet I is arranged below the gypsum rotational flow station, and the gypsum rotational flow station outlet II is arranged on one side of the gypsum rotational flow station and is communicated with the desulfurization absorption tower;
the vacuum belt conveyor is arranged below the first outlet of the gypsum rotational flow station, a vacuum groove of the vacuum belt conveyor is of a sectional type and is divided into a main water separation section and a secondary water separation section through a vacuum groove partition plate, and two gypsum cake industrial water washing nozzles are arranged above the secondary water separation section;
the gypsum dehydration filtrate tank is divided into a first chamber and a second chamber by a partition plate, the first chamber is communicated with the main water separation section by an outer water discharge pipeline, and the second chamber is communicated with the secondary water separation section by an outer water discharge pipeline.
As a further improvement of the scheme, the lower part of the first chamber is connected with a desulfurization wastewater chemical treatment system or a primary wastewater cyclone station through a filtrate pipe I.
As a further improvement of the scheme, the lower part of the second chamber is connected with the desulfurization recovery tower through a second filtrate pipe.
As a further improvement of the scheme, the first filtrate pipe and the second filtrate pipe are provided with check valves.
As a further improvement of the scheme, the outer drainage pipelines extend to the positions below the liquid levels of the first chamber and the second chamber.
Compared with the prior art, the utility model has reasonable structure,
1. the method overcomes the defects in the prior art, and provides the method for recycling the high-solid-content low-chloride-ion wastewater generated by the gypsum dehydration belt conveyor to the absorption tower, so that the industrial water required by the absorption tower for supplementing is greatly reduced, and the water quality of the liquid supplementing of the absorption tower is ensured.
2. The limit that gypsum cake flushing water, vacuum groove sealing water and various concentrations of filter liquor of the original dewatering belt conveyor can be only recycled to the absorption tower is overcome, and the condition that the concentration of chloride ions in the absorption tower is high or the liquid level is high can be greatly relieved.
3. The equipment improvement is easy to realize, the flow structure is simple, and the economical efficiency, the reliability and the environmental protection performance of the gypsum dewatering belt conveyor and the desulfurization wastewater operation which are commonly used in a thermal power plant can be obviously improved. Meanwhile, the original primary and secondary desulfurization wastewater cyclone station can be shut down, and the system design, construction and operation cost is greatly reduced.
4. The volume of the desulfurization waste water can be greatly reduced, and the method can be widely applied to various projects of desulfurization waste water zero discharge such as thermal evaporation or flue evaporation in the process flow, so that the reduction and emission reduction maximization of the desulfurization waste water is realized.
Drawings
FIG. 1 is a schematic structural diagram of the wet desulphurization wastewater reduction and emission reduction system.
Detailed Description
The technical solution of the present invention will be further explained with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, the wet desulphurization waste water reduction and emission reduction system comprises:
the gypsum swirling station 10 comprises a plurality of swirlers 11, a gypsum swirling station outlet I12 and a gypsum swirling station outlet II 13, wherein the gypsum swirling station outlet I12 is arranged below the gypsum swirling station 10, and the gypsum swirling station outlet II 13 is arranged at one side of the gypsum swirling station 10 and communicated with a desulfurization absorption tower 14;
the vacuum belt conveyor 20 is arranged below the first gypsum rotational flow station outlet 12, a vacuum groove 21 of the vacuum belt conveyor 20 is of a sectional type and is divided into a main water separation section 23 and a secondary water separation section 24 through a vacuum groove partition plate 22, and two gypsum cake industrial water washing nozzles 25 are arranged above the secondary water separation section 24;
the gypsum dewatering filtrate tank 30 is divided into a first chamber 32 and a second chamber 33 by a partition plate 31, the first chamber 32 is communicated with the main water separation section 23 through an outer water discharge pipeline 34, and the second chamber 33 is communicated with the secondary water separation section 24 through the outer water discharge pipeline 34.
In the prior art, waste water with high solid content and low chloride ion concentration and waste water with low solid content and high chloride ion concentration can only be completely recycled to an absorption tower, so that the defects that the absorption tower has high chloride ion content and high water level, gypsum filtrate cannot be recycled and a vacuum belt conveyor cannot run are caused indirectly; then, because of the gypsum whirl station overflow of original design is difficult to handle to the low chloride ion waste water of high solid content of desulfurization waste water chemical treatment system, can further influence desulfurization waste water chemical treatment and exert oneself, vicious circle finally causes whole desulfurization system's absorption tower chloride ion to further raise and absorption tower thick liquid density is high.
Therefore, the utility model discloses a wet flue gas desulfurization waste water decrement emission reduction system, carry out segmentation recovery and outer row with the gypsum dehydration filtrating of vacuum belt feeder, through keep apart the segmentation with vacuum belt feeder vacuum tank, and the method for separating for two cavities of vacuum filtrate case, and the vacuum pump still uses same platform, realize the separation of front end filtrating and rear end filtrating on the above-mentioned vacuum belt feeder, realized that high solid content low chloride ion concentration filtrating flows back to the absorption tower, low solid content high chloride ion concentration filtrating directly discharges outward to desulfurization waste water chemical treatment system simultaneously.
In this embodiment, the main water separation section 23 is a front end region in which a partition plate is installed in a vacuum tank of the vacuum belt conveyor, the concentration of chloride ions in gypsum filtrate in the front end region is equal to the concentration of chloride ions from the absorption tower, and the filtrate is the filtrate with the highest chloride ion concentration and extremely low solid content, and is collected and sucked into a front chamber of a gypsum dewatering filtrate tank through a vacuum pump and directly flows to a first-stage desulfurization wastewater cyclone supply tank or a desulfurization wastewater pre-settling tank for subsequent treatment.
In this embodiment, the water separation sub-section 24 is a rear end region of the vacuum tank of the vacuum belt conveyor to which the isolation plate is added, and the chlorine ions in the gypsum filtrate in this region are completely sucked along with the filtrate, and the residual chlorine ions are only physically carried by the gypsum cake, and under the cleaning of the gypsum cake washing nozzle, the chlorine ions have very low concentration and very low solid content, and are collected and sucked into a rear chamber of the gypsum dewatering filtrate tank through the vacuum pump and directly flow to the absorption tower.
The gypsum dewatering vacuum belt conveyor is divided into three different areas
First, gypsum slurry initial distribution area at front end of vacuum belt conveyor
In the area, a large amount of filtrate in gypsum slurry in the prior art is directly sucked by a vacuum pump through a vacuum groove of a vacuum belt conveyor and then recycled to an absorption tower, and the part of filtrate is filtrate with low solid content and high chloride ion concentration.
Secondly, all areas behind the front end of the vacuum belt conveyor where gypsum cakes are formed
In the area, the chlorine ions and the moisture of the gypsum cake are greatly reduced, and the gypsum cake is directly pumped by a vacuum pump through a vacuum groove of a vacuum belt conveyor and then recycled to an absorption tower in the prior art.
In this embodiment, in order to guarantee the further reduction of gypsum cake chloride ion concentration, adopted twice gypsum cake industrial water to wash nozzle 25 and be used for the gypsum cake to wash, further wash the low filtrate that contains solid low chloride ion concentration that originally remains in the gypsum cake.
Third, the tail end area of the vacuum belt conveyor
The tail end area of the vacuum belt conveyor is provided with five vacuum belt conveyor belts and filter cloth industrial washing water nozzles for cleaning the belts and the filter cloth, and the washed filtrate with high solid content and low chloride ion concentration is recycled to the absorption tower.
The second and third portions of the filtrate are collectively referred to as "high solids, low chloride concentration" filtrate.
As a further preferred embodiment, the lower part of the chamber one 32 is connected with the desulfurization waste water chemical treatment system 41 or the primary waste water cyclone station 42 through a filtrate pipe one 53.
As a further preferred embodiment, the lower part of the second chamber 33 is connected with the desulfurization recovery tower 43 through a second filtrate pipe 50.
As shown in fig. 1, in this embodiment, the vacuum trough 21 in the vacuum belt conveyor 20 is changed into a segmented type, and is divided into a main water separation section 23 and a secondary water separation section 24 by a vacuum trough partition plate 22, two gypsum cake industrial water washing nozzles 25 are arranged above the secondary water separation section 24, and the filtrate with low solid content and high chloride ion concentration is directly discharged to a desulfurization wastewater chemical treatment system or an electric dust removal inlet flue for evaporation treatment, so as to realize 'zoning discharge'; and directly recycling the filtrate with high solid content and low chloride ion concentration and the vacuum groove sealing water of the vacuum belt conveyor water separation secondary section to a desulfurization absorption tower to realize the partition recycling.
The structure improvement in the embodiment optimizes the gypsum dehydration process, ensures the desulfurization wastewater treatment output, greatly reduces a large amount of meaningless industrial water and electric energy consumption, saves energy, reduces emission, and simultaneously greatly reduces the corrosion of the whole desulfurization system caused by overhigh chloride ions. The invention has great popularization and reference significance for various wet desulphurization coal-fired power generating units.
As a further preferred embodiment, a check valve 51 is provided on the filtrate pipe one 53 and the filtrate pipe two 50.
As a further preferred embodiment, the outer drainage pipes 34 both extend below the liquid level in chamber one 32 and chamber two 33.
In this embodiment, a check valve 51 is provided through the first filtrate pipe 53 and the second filtrate pipe 50. The outer drainage pipes 34 extend to the positions below the liquid level of the first chamber 32 and the second chamber 33, so that vacuum damage can be effectively prevented.
Contrast prior art, the utility model discloses in, gypsum whirl is stood and is directly stopped using to desulfurization one-level waste water whirl feed box 60's pipeline.
TABLE 1 graph of the content of chloride ion in desulfurized waste water and absorption tower slurry before the use of the invention
TABLE 2 energy saving and emission reduction comparison chart before and after the invention is adopted
As shown in figure 1, the gypsum dewatering vacuum belt conveyor system of the utility model is optimized.
In the specific use process, firstly, gypsum slurry from the absorption tower is swirled by a gypsum swirling station in the figure, then high-concentration underflow is conveyed to a vacuum belt conveyor for continuous dehydration, and low-concentration overflow is conveyed to the absorption tower. The high chloride ion low solid content filtrate at the front section of the vacuum belt conveyor flows to the front cavity of the gypsum dewatering filtrate tank after being sucked by the gypsum dewatering vacuum pump 70, flows to the first-stage desulfurization wastewater cyclone supply tank or the desulfurization wastewater pre-clarification tank and is subsequently treated by chemical treatment, or is treated by evaporative crystallization, or is sprayed to the flue for evaporation treatment, and the filtrate is not diluted by industrial water, so the total discharge amount is small, and the treatment cost and time can be greatly reduced. The low-chlorine ion low-solid-content filtrate at the rear section of the vacuum belt conveyor and the sealing water of the vacuum belt conveyor are sucked by the vacuum pump and flow to the rear cavity of the gypsum dewatering filtrate box and then flow to the absorption tower for recycling, most of the chlorine ions contained in the filtrate are sucked by the front section and are diluted by the gypsum cake industrial water, so that the concentration of the chlorine ions is very low, the clean industrial water required to be supplemented by the absorption tower can be greatly reduced, the operation cost is reduced, and the absorption tower can be kept to operate under the condition of low concentration of the chlorine ions all the time.
As can be seen from tables 1 and 2, compared with the prior art, after the two are recycled and discharged in different areas, the operation and maintenance costs of the gypsum dewatering system and the desulfurization wastewater system can be greatly reduced, and the operation safety, the economical efficiency and the environmental protection performance of the system are improved.
The preferred embodiments of the present invention are described herein, but the scope of the present invention is not limited thereto. Modifications or additions to or replacement by similar means to those skilled in the art to which the invention pertains to the specific embodiments described herein are intended to be covered by the scope of the invention.
Claims (5)
1. The wet desulphurization waste water reduction and emission reduction system is characterized by comprising:
the gypsum cyclone station (10) comprises a plurality of cyclones (11), a gypsum cyclone station outlet I (12) and a gypsum cyclone station outlet II (13), wherein the gypsum cyclone station outlet I (12) is arranged below the gypsum cyclone station (10), and the gypsum cyclone station outlet II (13) is arranged on one side of the gypsum cyclone station (10) and communicated with the desulfurization absorption tower (14);
the vacuum belt conveyor (20) is arranged below the first outlet (12) of the gypsum rotational flow station, a vacuum groove (21) of the vacuum belt conveyor (20) is of a sectional type and is divided into a main water separation section (23) and a secondary water separation section (24) through a vacuum groove partition plate (22), and two gypsum cake industrial water washing nozzles (25) are arranged above the secondary water separation section (24);
the gypsum dewatering filtrate tank (30) is divided into a first chamber (32) and a second chamber (33) through a partition plate (31), the first chamber (32) is communicated with the main water separation section (23) through an outer water discharge pipeline (34), and the second chamber (33) is communicated with the secondary water separation section (24) through the outer water discharge pipeline (34).
2. The wet desulphurization waste water reduction and emission reduction system as set forth in claim 1, wherein the lower part of the first chamber (32) is connected with the desulfurization waste water chemical treatment system (41) or the primary waste water cyclone station (42) through a first filtrate pipe (53).
3. The wet desulphurization waste water reduction and emission reduction system as set forth in claim 1, wherein the lower part of the second chamber (33) is connected with the desulphurization recovery tower (43) through the second filtrate pipe (50).
4. The wet desulphurization waste water reduction and emission reduction system according to claim 2, wherein the first filtrate pipe (53) and the second filtrate pipe (50) are provided with check valves (51).
5. The wet desulfurization wastewater reduction and emission reduction system as set forth in claim 1, wherein a pipeline from the gypsum cyclone station to the desulfurization primary wastewater cyclone supply tank (60) is deactivated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021105041.4U CN212800006U (en) | 2020-06-15 | 2020-06-15 | Wet flue gas desulfurization waste water decrement reduces discharging system |
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| CN202021105041.4U CN212800006U (en) | 2020-06-15 | 2020-06-15 | Wet flue gas desulfurization waste water decrement reduces discharging system |
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