CN101456656B - Filtrating and squeezing process and system for desulphurization wastewater - Google Patents
Filtrating and squeezing process and system for desulphurization wastewater Download PDFInfo
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Abstract
The invention relates to a process and a system for filtering and squeezing wastewater. The system comprises a sludge inlet system, a sludge blow-drying system, a septum squeezing system, a filter cloth cleaning system and a matched electric control system. An outlet of a wastewater pool is communicated with a feed inlet of a feed pump through a feed conveying pipe; a discharge port of the feed pump is respectively communicated with feed inlets at two sides of a filter press through the feed conveying pipe and a feed valve; an outlet of an air compressor is communicated with an air inlet of an air storage tank; an air outlet of the air storage tank is respectively communicated with an air inlet of the filter press through an air pipe and a back flushing valve; the feed conveying pipe between the feed valve and the filter press is provided with a pressure sensor; the signal end of the pressure sensor is connected with the signal end of a PLC controller; an inlet of a press pump is connected with a water storage tank; and an outlet of the press pump passes through a squeezing pipeline and is connected with a main squeezing pipe of the filter press through a tee valve. The process and the system have the following advantages: 1, the process and the system have time conservation, high efficiency and low energy consumption; and 2, the process and the system can effectively squeeze out moisture remained in a filter cake, completely carry out back flushing on materials in a feeding pipeline to a material pool and achieve the aims of cleanness and smoothness of the pipeline.
Description
Technical field
The present invention relates to a kind of desulfurization wastewater filtration process and system, belong to waste water filtering technique and power plant desulfurization technique and make the field.
Background technology
China is maximum in the world coal production and country of consumption, and the ratio of coal in energy structure in China be up to 76.2%, the SO of China's discharging
290% all comes from fire coal.In recent years, China's acid rain pollution area enlarged rapidly, and the aspects such as China farm crop, forest and HUMAN HEALTH are caused huge infringement, also became the important factor that restricts China's economy, social sustainable development, therefore, and to SO
2The control of discharging is imperative.What use widely in the boiler smoke wet desulphurization method at present is limestone-gypsum method, and the waste water that limestone/gypsum method process produces is mainly from gypsum dehydration and cleaning system.The impurity that contains in waste water mainly comprises suspended substance, oversaturated sulphite, vitriol and heavy metal, is much wherein the first kind pollutent of strict control in national environmental standard.After neutralization, heavy metal precipitation, flocculation reaction, concentrated/clarification, through Filter Press, the clear water after filtration can discharge or reuse after reaching standard from the waste water of gypsum dehydration and cleaning system, the direct landfill of filter cake that produces after filtering.But because the solids component in desulfurization wastewater is difficult to be filtered, filter cloth is just blocked and lost efficacy after filtering several times, and after filtering, the water ratio of filter cake is higher, has affected transportation.
Summary of the invention
Purpose of design: avoid the weak point in background technology, designed a kind of desulfurization wastewater and filtered squeezing process and system.
Design: to achieve these goals.1, pressure filter adopts the design of two ends bidirectional feed, is one of feature of the present invention.The purpose of doing like this is: due to the cavity that pressure filter is superimposed and is formed by the polylith filter plate, its length is longer.If adopt unidirectional charging, not only the required pump pressure of charging is large, and energy consumption is high, and inevitably causes the even mud of filter cake became uneven that the pressure filter rear and front end forms easily to stop up, and the water ratio of filter cake is inhomogeneous; Adopt bidirectional feed, both can improve efficient, the required pump pressure of reduction charging of charging, can greatly reduce energy consumption again, the more important thing is that the thickness that makes filter cake can reach the thickness of design requirements and relatively consistent.2, adopt the pressurized air blowback system that the established filter cake of pressure filter is dried up, make simultaneously central duct unnecessary be not filtered design, be two of feature of the present invention.The purpose of doing like this is: the one, and utilize pressurized air that filter cake is dried up, compressed-air actuated pressure can reach 0.8MPa, can effectively part moisture content residual in filter cake be squeezed out; The 2nd, pressurized air is blown to pressure filter central duct and feed pipe, makes the mud that is not filtered in central duct and feed pipe return to sewage lagoon, thereby avoids the phenomenon of fouling in pipeline.3, automatically cleaning the design of adopting Pneumatic three-way ball valve in the filter cloth pipeline, is three of feature of the present invention.The purpose of doing like this is: the automatic cloth washing device on the pressure filter of installation in the process of washing cloth, is the process of mobile filter plate for some time, during this period of time in, be not need high pressure cleaning water that filter plate is rinsed.If adopt two-way valve to control the logical and disconnected of the water that washes cloth, just need to constantly start and stop wash cloth pump and switch valve, affect the normal operation of pump motor that washes cloth, and the pressure rise of the water that washes cloth needs the regular hour again.And the employing T-valve, the pump that washes cloth is in opened condition always, when the automatic cloth washing device does not need water, only needs T-valve is switched, and makes clear water return to water tank and just can realize.4, adopting the autoclave diaphragm Technology in Pressing is four of feature of the present invention, adopt the high pressure water of squeezing water pump generation as press media, enter in the membrane filter plate chamber of pressure filter, by heaving that diaphragm is out of shape, make the filter cake attenuation, thereby the moisture in filter cake is discharged, reduced the water ratio of filter cake.
Technical scheme 1: desulfurization wastewater filters squeezing process and system, and it comprises into mud system, mud blow-drying system, cloth cleaning system for pressing, diaphragm pressing system and supporting electric control system.Material pond outlet is communicated with the fresh feed pump opening for feed by carrier pipe, and the fresh feed pump discharge port passes through carrier pipe, feed valve and is communicated with the opening for feed of the both sides of pressure filter; Pneumatics press outlet is communicated with the gas-holder inlet mouth, and tracheae is passed through in the gas-holder air outlet, back-flushing valve is communicated with the pressure filter inlet mouth respectively, and between feed valve and pressure filter, carrier pipe is provided with pressure transmitter and pressure transmitter is controlled by PLC.The import of press pump is connected with water tank, and outlet is connected with the squeezing house steward of pressure filter through T-valve by the squeezing pipeline.
Technical scheme 2: desulfurization wastewater filters squeezing process and system, and fresh feed pump simultaneously injects clear water discharging its inner filtration after from pond slurry bottom by carrier pipe from the both sides opening for feed of pressure filter with sewage; When the pressure of the pressure transmitter on carrier pipe between feed valve and pressure filter reached set(ting)value, fresh feed pump quit work; Air compressor machine work makes the pressurized air in gas-holder dry up filter press filter cake by tracheae, back-flushing valve, and pressurized air arrives sewage lagoon with the mud blowback that is not filtered in the pressure filter central duct simultaneously; Start press pump, high pressure water, then by respectively being in charge of in each diaphragm cavity that enters into membrane filter plate, is slowly heaved barrier film in T-valve enters the squeezing house steward of pressure filter by pipeline, the squeezing filter cake, moisture in the slowly attenuation of the thickness of filter cake, filter cake is discharged, when the pressure of diaphragm pressing reaches set(ting)value, stop press pump, T-valve switches original position simultaneously, and the water in diaphragm cavity turns back in water tank by being in charge of house steward, and the pressure drop in diaphragm cavity is to normal pressure; Flushing pump work is rinsed by washing pipe, Pneumatic three-way ball valve water tank to cloth-washing apparatus and to filter plate.
The present invention compares with background technology, the one, the design of pressure filter two ends employing bidirectional feed, not only improve efficient, the required pump pressure of reduction charging of charging, can greatly reduce energy consumption again, the more important thing is that the thickness that makes filter cake can reach the thickness of design requirements and relatively consistent, reduce filter cake moisture content; The 2nd, adopt pressurized air to dry up, make mud to return to the design of sewage lagoon to the pressure filter central duct, can effectively part moisture content residual in filter cake be squeezed out, avoid the phenomenon of fouling in pipeline; The 3rd, the water loop design of adopting in cloth cleaning system for pressing, the fault of avoiding the motor frequent start-stop to produce is saved time.The 4th, adopt the autoclave diaphragm Technology in Pressing, adopt high pressure water that the squeezing water pump produces as press media, enter in the membrane filter plate chamber of pressure filter, by heaving that diaphragm is out of shape, make the filter cake attenuation, thereby the moisture in filter cake is discharged, reduced the water ratio of filter cake.
Description of drawings
Fig. 1 is the schematic diagram that desulfurization wastewater filters squeezing process and system.
Embodiment
Embodiment 1: with reference to Fig. 1.Desulfurization wastewater filters squeezing process and system, and it comprises into mud system, mud blow-drying system, filter cake squeezing system, cloth cleaning system for pressing and supporting electric control system.Flushing pump 1-1 water-in in cloth cleaning system for pressing 1 is communicated with water tank 1-2 by washing pipe 1-8, washing return water pipe 1-4 is communicated with washing pipe 1-3 by Pneumatic three-way ball valve 1-5 and washs that return water pipe 1-4 water return outlet is communicated with water tank 1-2, washing pipe 1-3 water-in is communicated with flushing pump 1-1 water outlet, be connected by valve and water-supply pipe 1-9 between water tank 1-2 and washing pipe 1-3, Pneumatic three-way ball valve 1-5 is communicated with cloth-washing apparatus 1-7 by washing pipe 1-6.Sewage lagoon 2-1 outlet is communicated with fresh feed pump 2-3 by carrier pipe 2-11, and the opening for feed of fresh feed pump 2-3 is connected with carrier pipe 2-11 by ball valve, and the discharge port of sewage lagoon 2-1 is equipped with ball valve; The discharge port of fresh feed pump 2-3 is equipped with vacuum breaker, ball valve and tensimeter.。fresh feed pump 2-3 and discharge port also connect and are communicated with opening for feed 2-6 and the 2-14 of the both sides of pressure filter 2-7 respectively by carrier pipe 2-12, feed valve 2-4 and feed valve 2-5, and feed valve 2-4 and 2-5 are Pneumatic butterfly valve, on tracheae between air compressor machine 3-1 and gas-holder 3-2, vacuum breaker and ball valve are housed, ball valve and tensimeter are installed on tracheae 3-3, on gas-holder 3-2, tensimeter is housed, back-flushing valve 3-4 is pneumatic ball valve, pneumatics press 3-1 outlet is communicated with gas-holder 3-2 inlet mouth, gas-holder 3-2 air outlet is by tracheae 3, back-flushing valve 3-4 is communicated with pressure filter 1-12 inlet mouth respectively, between feed valve 2-5 and pressure filter 2-7, carrier pipe is provided with pressure transmitter 2-17 and pressure transmitter 2-17 signal end is connected with the signal end of PLC controller, pressure filter 2-7 below is equipped with turnover panel and meets liquid device 2-8, pressure filter 2-7 one side is provided with water outlet 2-15 and is communicated with filtrate pipe 2-16, another is equipped with filter plate pressing system 2-9, filter plate pressing system 2-9 is controlled by Hydraulic Station 2-10.Filtrate outlet 2-15 discharges by filtrate pipe 2-16.The import of press pump 1-3 is connected with water tank 1-2, and outlet is by squeezing pipeline 1-4, is connected with squeezing house steward on pressure filter 2-7 through T-valve 1-10.The oscilaltion motor band brake of cloth-washing apparatus 1-7; Turnover panel connects the motor band brake of liquid device 2-8.
Embodiment 2: on the basis of embodiment 1, the turnover panel of filtrate outlet 2-15 by pressure filter 2-7 below connects the liquid device 2-8 water that will wash cloth and discharges.
embodiment 3: on the basis of embodiment 1, desulfurization wastewater filters squeezing process and system, it is characterized in that: fresh feed pump 2-3 injects in it by carrier pipe 2-11 and 2-12 from the both sides opening for feed of pressure filter 2-7 sewage lagoon 2-1 slurry by pipeline simultaneously, due to pressure transmitter 2-17 being housed on pipeline, the signal end of this sensor is connected by the signal end of signal wire with the PLC controller, can set easily required pressure-controlling value and be provided with pressure bound setup control circuit in the PLC controller and have by the PLC control panel, therefore when the pressure of the pressure transmitter 2-17 on carrier pipe between feed valve 2-5 and pressure filter 2-7 reaches setting low voltage value (0.8MPa), PLC controller command execution unit cuts off fresh feed pump 2-3 power supply, fresh feed pump 2-3 quits work, , air compressor machine 3-1 work, make the pressurized air in gas-holder 3-2 pass through tracheae 3, back-flushing valve 3-4 dries up pressure filter 2-7 filter cake, water in mud is extruded through pressure filter liquid outlet 2-15 and filtrate pipe 2-16 discharged, pressurized air is by tracheae 3 simultaneously, back-flushing valve 3-4 will be to the mud blowback that is not filtered unnecessary in pressure filter 2-7 central duct and feed pipe to material pond 2-1.Start press pump 1-3, high pressure water by pipeline 1-4 in T-valve 1-10 enters the squeezing house steward of pressure filter, again by respectively being in charge of in each diaphragm cavity that enters into membrane filter plate, barrier film is slowly heaved, the squeezing filter cake, the slowly attenuation of the thickness of filter cake, moisture in filter cake is discharged, when the pressure of diaphragm pressing reaches set(ting)value (1.5MPa), stop press pump 1-3, T-valve switches original position simultaneously, and the water in diaphragm cavity turns back in water tank by being in charge of house steward, and the pressure drop in diaphragm cavity is to normal pressure.Flushing pump 1-1 work, with water tank 1-2 by washing pipe 1-4 and 1-5, Pneumatic three-way ball valve 1-5 to cloth-washing apparatus 1-11 and filter plate is rinsed.
What need to understand is; although above-described embodiment is to the present invention's detailed text description of contrasting; but these text descriptions; just the simple text of mentality of designing of the present invention is described; rather than to the restriction of mentality of designing of the present invention; any combination, increase or modification that is no more than mentality of designing of the present invention all falls within the scope of protection of the present invention.
Claims (8)
1. a desulfurization wastewater filters squeezing system, it comprises into the mud system, the mud blow-drying system, the filter cake squeezing system, cloth cleaning system for pressing and supporting electric control system, it is characterized in that: be communicated with fresh feed pump (2-3) by sludge pipe bottom sludge sump (2-1), the charging pump outlet is in parallel and pass through sludge pipe, fresh feed pump (2-3) and discharge port also connect and by carrier pipe (2-12), the first feed valve (2-4) and the second feed valve (2-5) are communicated with the first opening for feed (2-6) and second opening for feed (2-14) of the both sides of pressure filter (2-7) respectively, air compressor machine (3-1) outlet is communicated with gas-holder (3-2) inlet mouth, and tracheae (3) is passed through in gas-holder (3-2) air outlet, back-flushing valve (3-4) is communicated with a side opening for feed of pressure filter (2-7), advance between the second feed valve (2-5) and pressure filter (2-7) that the mud pipeline is provided with pressure transmitter (2-17) and pressure transmitter (2-17) is controlled by the PLC Controlling System, the import of press pump is connected with water tank, outlet is connected with squeezing house steward on pressure filter through T-valve by the squeezing pipeline.
2. desulfurization wastewater according to claim 1 filters squeezing system, it is characterized in that: below pressure filter (2-7), turnover panel is installed and connects liquid device (2-8), pressure filter (2-7) side be provided with water outlet (2-15) and be communicated with filtrate pipe (2-16), pressure filter (2-7) another filter plate pressing system (2-9) is housed, filter plate pressing system (2-9) is controlled by Hydraulic Station (2-10).
3. desulfurization wastewater according to claim 1 filters squeezing system, it is characterized in that: the opening for feed of fresh feed pump (2-3) is connected with carrier pipe (2-11) by the first ball valve, and the discharge port of sewage lagoon (2-1) is equipped with the second ball valve; The discharge port of fresh feed pump (2-3) is equipped with vacuum breaker, ball valve and tensimeter.
4. desulfurization wastewater according to claim 1 filters squeezing system, and it is characterized in that: the first feed valve (2-4) and the second feed valve (2-5) are Pneumatic butterfly valve.
5. desulfurization wastewater according to claim 1 filters squeezing system, it is characterized in that: on the tracheae between air compressor machine (3-1) and gas-holder (3-2), vacuum breaker and the 3rd ball valve are housed, on tracheae (3-3), the 4th ball valve and tensimeter are installed, on gas-holder (3-2), tensimeter is housed, back-flushing valve (3-4) is pneumatic ball valve.
6. desulfurization wastewater according to claim 1 filters squeezing system, it is characterized in that: flushing pump (1-1) water-in in cloth cleaning system for pressing (1) is communicated with water tank (1-2) by washing pipe (1-8), washing return water pipe (1-4) is communicated with washing pipe (1-3) and washs return water pipe (1-4) water return outlet by Pneumatic three-way ball valve (1-5) and is communicated with water tank (1-2), washing pipe (1-3) water-in is communicated with flushing pump (1-1) water outlet, be connected by valve and water-supply pipe (1-9) between water tank (1-2) and washing pipe (1-3), Pneumatic three-way ball valve (1-5) is communicated with cloth-washing apparatus (1-7) by washing pipe (1-6).
7. desulfurization wastewater according to claim 6 filters squeezing system, it is characterized in that: the oscilaltion motor band brake of cloth-washing apparatus (1-7); Turnover panel connects the motor band brake of liquid device (2-8).
8. a desulfurization wastewater filters pressing method, it is characterized in that: open feed valve, start fresh feed pump, waste water injects in pressure filter with the both sides opening for feed from pressure filter simultaneously by carrier pipe in sludge sump, and the clear water after filtration gathers laggard pipeline from liquid outlet and discharges; When the pressure of the pressure transmitter on carrier pipe between feed valve and pressure filter reaches set(ting)value, fresh feed pump quits work, air compressor machine work, pressurized air enters in gas-holder, when pressure reaches high-voltage value, air compressor machine quits work automatically, and when pressure drop arrives low voltage value, air compressor machine starts again automatically, therefore the pressure of gas-holder compressed air is maintained in certain stress level, pressurized air enters pressure filter by tracheae, back-flushing valve, and the unnecessary mud that is not filtered will turn back to the material pond from reverse flow valve in the pressure filter central duct; Start press pump, high pressure water, then by respectively being in charge of in each diaphragm cavity that enters into membrane filter plate, is slowly heaved barrier film in T-valve enters the squeezing house steward of pressure filter by pipeline, the squeezing filter cake, moisture in the slowly attenuation of the thickness of filter cake, filter cake is discharged, when the pressure of diaphragm pressing reaches set(ting)value, stop press pump, T-valve switches original position simultaneously, and the water in diaphragm cavity turns back in water tank by being in charge of house steward, and the pressure drop in diaphragm cavity is to normal pressure; Flushing pump work is rinsed by washing pipe, Pneumatic three-way ball valve water tank to cloth-washing apparatus and to filter plate.
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| CN101456656B true CN101456656B (en) | 2013-06-26 |
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| CN102583943A (en) * | 2012-03-06 | 2012-07-18 | 光大环保科技发展（北京）有限公司 | Sewage plant sludge modifying and drying method and sludge processing system |
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| CN114292086A (en) * | 2021-12-31 | 2022-04-08 | 福建省乐普陶板制造有限公司 | Process for manufacturing raw materials of brick, tile and ceramic plate |
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Owner name: XINGYUAN ENVIRONMENT TECHNOLOGY CO., LTD. Free format text: FORMER NAME: HANGZHOU XINGYUAN FILTER TECHNOLOGY CO., LTD. |
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