CN210367320U - Device for treating desulfurization wastewater by wet slag removal and evaporation - Google Patents
Device for treating desulfurization wastewater by wet slag removal and evaporation Download PDFInfo
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- CN210367320U CN210367320U CN201920605139.7U CN201920605139U CN210367320U CN 210367320 U CN210367320 U CN 210367320U CN 201920605139 U CN201920605139 U CN 201920605139U CN 210367320 U CN210367320 U CN 210367320U
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Abstract
The utility model provides an utilize wet-type slagging-off evaporation to deal with desulfurization waste water device, the device includes: a wet slag removal system for removing slag; the water inlet of the water storage tank is communicated with the desulfurization wastewater conveying pipeline and the slag water outlet of the wet slag removal system and is used for collecting and mixing the desulfurization wastewater and the slag water; it is also in communication with the cooling water inlet of the wet slag removal system. Mixing alkaline slag water clarified liquid and acidic desulfurization wastewater in a reservoir, neutralizing to obtain mixed wastewater with pH of 7-9, supplementing water to an upper tank body and a water seal of a slag dragging machine through a slag water pump, wherein a filter screen is arranged at an inlet pipeline of the slag water pump and used for intercepting solid particles in the slag water; a sewage discharge door is arranged at the inlet and outlet of the filter screen; an electronic scale inhibitor is arranged at the outlet of the slag water pump, so that the scaling and blockage of the water replenishing pipeline are reduced. The device saves water sources, realizes zero discharge of desulfurization wastewater, changes waste into valuables, is energy-saving, environment-friendly, economical and practical, and is suitable for areas with low dry slag economic value or power plants with heavy coking of coal.
Description
Technical Field
The utility model relates to a waste water treatment equipment technical field, more specifically say, in particular to desulfurization waste water treatment method and utilize wet-type slagging-off evaporation to deal with desulfurization waste water device.
Background
In recent years, the nation puts higher demands on the influence of the water environment generated by coal-fired power plants, namely, zero discharge of wastewater from the whole plant is realized, so that good environmental benefits and social benefits are expected to be achieved. The wastewater recovery of the coal-fired power plant is basically to be recycled to the desulfurization water after the water management and cascade utilization of the whole plant, so that how to treat the high-salinity wastewater generated by the desulfurization system is the key of the zero discharge of the wastewater of the whole plant, namely how to provide a desulfurization wastewater treatment device capable of effectively treating the desulfurization wastewater, and the problem to be solved by technical personnel in the field is urgently needed.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model aims to provide an utilize wet-type slagging-off evaporation to deal with desulfurization waste water device.
A device for treating desulfurization waste water by wet deslagging and evaporation, which comprises:
a wet slag removal system for removing slag discharged from the boiler and generating slag water; and
the water inlet of the water storage tank is communicated with the water outlet of the desulfurization wastewater conveying pipeline and the slag water outlet of the wet-type slag removal system and is used for collecting mixed desulfurization wastewater and slag water from the wet-type slag removal system;
the reservoir is also communicated with a cooling water inlet of the wet slag removal system; the mixed wastewater in the reservoir is used as a slag cooling water source of the wet mechanical deslagging system.
In the above apparatus for treating desulfurization waste water by wet type deslagging evaporation, as a preferred embodiment, the wet type deslagging system includes: the slag dragging machine is arranged below a slag discharging port of the boiler and is used for collecting and cooling slag generated by the operation of the boiler to obtain wet slag and then conveying the wet slag; the slag bin is communicated with the slag conveyor and is used for collecting wet slag from the slag conveyor and dehydrating the wet slag to obtain dehydrated wet slag and slag water; the slag water clarifying pool is communicated with a slag water outlet of the slag bin and is used for collecting and clarifying the slag water from the slag bin; a water outlet of the reservoir is communicated with a cooling water inlet of the slag conveyor; and the water inlet of the reservoir is communicated with the overflow port of the slag water clarification tank.
In the above apparatus for treating desulfurization waste water by wet deslagging evaporation, as a preferred embodiment, the slag water clarifier is further communicated with an overflow port of the upper tank body of the slag conveyor, and is configured to receive slag water overflowing from the upper tank body of the slag conveyor in an abnormal situation.
In the above apparatus for treating desulfurization waste water by wet-type deslagging evaporation, as a preferred embodiment, the apparatus further comprises: the filter screen is arranged on a water outlet pipeline of the reservoir; and the slag water pump is arranged on a water replenishing pipeline communicated with the water storage tank and a cooling water inlet of the wet-type slag removal system and used for pumping the mixed wastewater filtered by the filter screen into the wet-type slag removal system.
In the above apparatus for treating desulfurization waste water by wet-type deslagging evaporation, as a preferred embodiment, the apparatus further comprises: and the sewage discharge door is arranged at the inlet end and the outlet end of the filter screen.
In the above apparatus for treating desulfurization waste water by wet-type deslagging evaporation, as a preferred embodiment, the apparatus further comprises: the electronic scale inhibitor is arranged on the water replenishing pipeline and is positioned on the outlet side of the slag water pump; the electronic scale inhibitor is based on the alternating electromagnetic field principle.
In the above apparatus for treating desulfurization waste water by wet-type deslagging evaporation, as a preferred embodiment, the apparatus further comprises: the water level sensor is arranged in an upper tank body of the slag conveyor; the water replenishing valve is arranged on the water replenishing pipeline; and the controller is connected with the water level sensor and the water replenishing valve and is used for controlling the opening and closing of the water replenishing valve according to the water level in the upper tank body monitored by the water level sensor.
In the above apparatus for treating desulfurization waste water by wet-type deslagging evaporation, as a preferred embodiment, the apparatus further comprises: the water temperature sensor is arranged in an upper tank body of the slag conveyor; correspondingly, the controller is connected with the water temperature sensor and used for controlling the opening and closing of the water replenishing valve according to the water temperature in the upper tank body monitored by the water temperature sensor.
In the above apparatus for treating desulfurization waste water by wet-type deslagging evaporation, as a preferred embodiment, the apparatus further comprises: the water level scale lines are arranged in the upper tank body of the slag conveyor; the lens of the camera is aligned to the water level scale mark; correspondingly, the controller is connected with the signal output end of the camera and used for identifying the water level of the upper trough body according to the water level scale line image shot by the camera, judging whether the water level of the upper trough body is consistent with the water level of the upper trough body obtained by the water level sensor or not, and sending prompt information if the water level of the upper trough body is not consistent with the water level of the upper trough body obtained by the water level sensor.
In the above-mentioned utilize wet-type slagging-off evaporation to deal with desulfurization waste water device, as an preferred embodiment, set up PH meter and level gauge in the cistern the desulfurization waste water entry end of cistern is equipped with desulfurization waste water control valve, the controller still with the signal output part of PH meter, the signal output part of level gauge with desulfurization waste water control valve connects, the controller basis the PH value that the PH meter was monitored with the liquid level that the level gauge was monitored is right desulfurization waste water control valve's the opening and close is controlled.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
the slag remover is provided with a slag remover, a slag bin and a reservoir, the slag remover is arranged below a slag discharging port of a boiler and used for collecting and cooling slag generated by the operation of the boiler to obtain wet slag, then the wet slag is conveyed, a discharging port of the slag bin is communicated with a discharging port of the slag remover, a slag discharging port of the slag bin is used for discharging the wet slag dehydrated by the slag bin, an overflow port of the slag bin is used for discharging slag water obtained in the dehydration treatment process of the slag bin, supernatant liquid of the clarified slag water overflows to the reservoir and is mixed with desulfurization wastewater to obtain mixed wastewater with a specific pH value, a water outlet of the reservoir is communicated with a cooling water inlet of the slag remover through a water replenishing pipeline, the neutralization of the desulfurization wastewater and the slag water is realized, then the neutralized mixed wastewater is used as the slag remover and water replenishing water, a large amount of high-quality water source is saved, and the zero discharge of the desulfurization wastewater can be realized, so that the device has, Environmental protection, economy and practicality, comprehensive energy saving of 30 percent, waste water saving, zero discharge and operation cost of more than 90 percent, and the like. Additionally, the utility model discloses still have following beneficial effect:
one, the utility model discloses save extracorporal circulatory cooling equipment such as plate heat exchanger, greatly reduced the operating time of sediment water pump, changed accident situation from the continuous operation and just moved down, not only saved the equipment investment expense of engineering initial stage, greatly reduced power consumption and daily maintenance work load and the expense of changing spare parts moreover.
Two, the utility model discloses a controller and the automatic interlocking control who sets up level sensor and moisturizing valve in the cell body on dragveyer for the water yield of the make-up water that gets into wet-type deslagging system from the cistern and the water yield of the loss water that wet-type deslagging system reduced balance mutually, realize the automatic control of the no overflow operation of wet-type deslagging system.
Thirdly, the utility model discloses still including setting up temperature sensor, camera, warning module and the temperature display that appears in the cell body on the dragveyer and realized the automatic monitoring to temperature in the dragveyer, but greatly reduced human labor and cost. The utility model discloses continuous measurement level gauge (being water level sensor), thermometer (temperature sensor) have all adopted accurate novel product, have avoided the system to miss the emergence of moving and refusing the phenomenon.
Fourth, the utility model discloses filter screen and electron antisludging device have been set up on moisturizing pipeline to set up the blowdown door, this electron antisludging device application scope is wide, can extensively be used for different pipeline diameters, different flow, different medium, and is all unrestricted to rivers direction, violently erect pipeline, system pressure.
Fifthly, the utility model discloses the slag water pipeline adopts the pipeline of interior surface coating KN17 wear-resisting corrosion resistant ceramic coating, can effectively resist the chlorine ion and corrode.
Sixth, the utility model discloses be used for wet-type mechanical deslagging system with desulfurization waste water, not only need not carry out special processing and can practice thrift a large amount of high-quality water sources to desulfurization waste water.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic diagram of a device for treating desulfurization waste water by wet-type deslagging and evaporation in the embodiment of the utility model;
description of reference numerals:
the device comprises an upper tank body 1 of the slag dragging machine, a slag bin 2, a slag water pipeline 3, a slag water clarification tank 4, a reservoir 5, a desulfurization wastewater conveying pipeline 6, a filter screen 7, a water supplementing pipeline 8, an electronic scale inhibitor 9, a water supplementing valve 10, a slag water pump 11, a desulfurization wastewater source 12 and a furnace bottom water seal 13 of a boiler.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
In order to handle the zero release in order to realize desulfurization waste water to coal fired power plant's desulfurization waste water, the embodiment of the utility model provides an utilize wet-type slagging-off evaporation to deal with desulfurization waste water device, it includes: a wet deslagging system and a water reservoir 5.
A wet slag removal system for removing slag discharged from the boiler and generating slag water; the utility model discloses a wet-type deslagging system can be the common wet-type mechanical deslagging system in this field, and preferred wet-type mechanical deslagging system includes: the slag dragging machine is arranged below the slag discharging port of the boiler and is used for collecting and cooling slag generated by the operation of the boiler to obtain wet slag, and then conveying the wet slag to the slag bin 2; the slag bin 2 is communicated with the slag conveyor and is used for collecting wet slag from the slag conveyor and dehydrating the wet slag to obtain dehydrated wet slag and slag water; the slag water clarifying pool 4 is communicated with a slag water outlet (also called as a slag water overflow port) of the slag bin 2 through a slag water pipeline 3 and is used for collecting and clarifying the slag water from the slag bin 2; the overflow port of the slag water clarifying pool 4 is the slag water outlet of the wet mechanical slag removal system.
And the water inlet of the water storage tank 5 is communicated with the water outlet of the desulfurization wastewater conveying pipeline 6 and is also communicated with the overflow port of the slag water clarification tank 4, and the water storage tank is used for collecting mixed desulfurization wastewater and slag water from a wet slag removal system. The water outlet of the water-cooled slag remover is communicated with the cooling water inlet of the slag remover through a water supplementing pipeline 8, and the mixed wastewater in the water storage tank 5 is used as a slag cooling water source of the wet mechanical slag removing system.
Specifically, the slag dragging machine is arranged below a boiler slag discharging port and used for collecting and cooling slag generated by boiler operation to obtain wet slag, and then conveying the wet slag. The slag conveyor needs to use water as a coal cinder cooling medium in the working process, and after high-temperature coal cinder enters water, water is heated to evaporate part of water in the form of water vapor, so that the slag conveyor needs to replenish water. The slag conveyor is a water immersion type scraper slag conveyor. The slag bin 2 is provided with a discharge opening, a slag discharge opening and an overflow opening, the discharge opening is communicated with a discharge opening of the slag conveyor, the slag discharge opening is used for discharging wet slag dehydrated in the slag bin 2, and the overflow opening is used for discharging slag water obtained in the dehydration treatment process of the slag bin 2. Cistern 5 has water inlet and delivery port, and the water inlet can pass through slag water pipeline 3 intercommunications with 2 overflow mouths in the sediment storehouse, and the water inlet also can be through slag water pipeline 3 and 4 water inlets intercommunication in slag water clarifier, and the overflow mouth and the 5 delivery ports of cistern intercommunication of slag water clarifier 4, 5 water inlets of cistern still with 6 intercommunications of desulfurization waste water pipeline, the cooling water entry of 5 delivery ports of cistern and dragveyer passes through moisturizing pipeline 8 intercommunications. The slag dragging machine and the slag bin 2 belong to a wet slag removing system, and preferably, the wet slag removing system further comprises a slag water clarifying pool 4. The desulfurization waste water conveying pipeline 6 is communicated with a desulfurization waste water source 12, and the desulfurization waste water source 12 can be the effluent from a clean water tank after desulfurization waste water three-way tank clarification treatment.
In the production, the characteristic pollutants in the desulfurization wastewater are mainly fluoride, sulfide and heavy metal. When the desulfurization wastewater with the pH value of 5.0-5.7 enters the water storage tank 5 and is mixed with slag water with the pH value of about 12-13, the two types of water are neutralized to be slightly alkaline, for example, the pH value is controlled to be 7-9, and then the neutralized mixed wastewater is used as a supplementary water source of the slag dragging machine and is used for cooling slag (or called hot slag), so that the corrosion effect of the desulfurization wastewater directly supplemented into the slag dragging machine on the water seal and the inner wall of the inner groove body can be effectively reduced. After the mixed waste water after neutralization enters the slag extractor, impurities such as partial suspended matters in the mixed waste water can be adsorbed by waste slag, the content of the suspended matters can be effectively reduced, and meanwhile, partial heavy metal ions can be precipitated after being mixed with alkaline slag water. And the wet slag removal system is used for treating the desulfurization wastewater, so that zero discharge of the desulfurization wastewater is realized. The water loss of the device comprises the sum of water which is evaporated and taken away by water and wet slag due to boiler heat radiation and cooling after hot slag falls into water, namely, after the neutralized mixed wastewater absorbs the heat of coal slag in a slag conveyor and absorbs the heat radiation of the boiler, a part of the neutralized mixed wastewater is changed into water vapor and is lost in a steam form; and water on the surface of the coal cinder is lost after the coal cinder is fished up by the slag dragging machine. The pH value of the neutralized mixed wastewater is preferably controlled to about 8.
In order to avoid the problems of corrosion, water seepage and water leakage of the joint part of the desulfurization wastewater conveying pipeline 6 and the water storage tank 5, the joint part of the desulfurization wastewater conveying pipeline 6 is provided with lining rubber to achieve the purpose of corrosion resistance. In the same way, in order to prevent corrosion, the inner wall of the reservoir is provided with lining glue or an anti-corrosion coating.
In order to further utilize the desulfurization waste water, the water outlet of the water storage tank 5 is communicated with a water seal groove of the furnace bottom 13 of the boiler through a water replenishing pipeline 8. Namely, the neutralized mixed wastewater is used as water for a boiler bottom water seal tank.
The apparatus further comprises a screen 7 mounted on the outlet pipe of the reservoir 5 so as to prevent larger particles of slag from entering the feed water pipe 8 and causing pipe blockage. And a sewage discharge door is arranged at the front pipeline and the rear pipeline of the filter screen 7 so as to remove deposited sewage in the pipelines to prevent the pipelines from being blocked by scales and the filter screen 7 from being cleaned.
In order to further prevent the structure of the water replenishing pipeline 8 from being blocked, the device further comprises: and the electronic scale inhibitor 9 is arranged on the water replenishing pipeline 8. The electronic scale inhibitor 9 is an electronic scale inhibitor 9 based on the alternating electromagnetic field principle, and is equipment which generates an electromagnetic field through an instrument, enables water molecules to be in a high-speed motion state under the action of the electromagnetic field, enables calcium and magnesium ions in water to be in a motion state and cannot be combined to form scale, and achieves the purpose of preventing scaling. When the electronic scale inhibitor 9 works, the signal generator generates a current with high-speed change of polarity, amplitude and frequency, and the current generates a rapidly-changing magnetic field in the water replenishing pipeline 8 to Ca in water2+、Mg2+Generating an ion interference effect, changing the electrochemical and physical properties of the ions, and reducing Ca2 +、Mg2+、CO3 2-、SO4 2-Thereby preventing scale from being combined between the ions and preventing the water replenishing pipeline 8 from scaling. The electronic scale inhibitor 9 has wide application range and can be widely used for different pipeline diameters and different diametersThe flow rate and different media have no limit to the water flow direction, horizontal and vertical pipelines and system pressure.
This device still includes: and the slag water pump 11 is arranged on the water replenishing pipeline 8 and is positioned between the electronic scale inhibitor 9 and the filter screen 7, and provides power for conveying the neutralized mixed wastewater on the water replenishing pipeline 8.
The water inlet of the slag water clarifying pool 4 is communicated with the overflow port of the slag bin 2 through a slag water pipeline 3, and the overflow port of the slag water clarifying pool 4 is communicated with the water inlet of the water storage pool 5. The wet slag fished by the slag scooping machine is further dehydrated in the slag bin 2, and the dehydrated wet slag is comprehensively utilized by automobile outward transportation or in an ash field. The slag water that the wet sediment was deviate from in sediment storehouse 2 flows to slag water clarifier 4 through slag water pipeline 3, and the supernatant after sediment filtration overflows to cistern 5 in the slag water clarifier 4, and desulfurization waste water supplyes cistern 5, and 5 inner walls in the cistern set up the lining and glue anticorrosive.
This device still includes: a water level sensor, a water replenishing valve 10 and a controller. The water level sensor is arranged in the upper tank body 1 of the slag conveyor and used for monitoring the water level in the upper tank body 1. The water replenishing valve 10 is arranged on the water replenishing pipeline 8 and is controlled by the water level sensor in a linkage manner, so that two effects can be realized: 1. maintaining the water temperature; 2. the water level is maintained. The controller is in signal connection with the water level sensor and the water replenishing valve 10 and is used for controlling the opening and closing of the water replenishing valve 10 according to the water level in the upper tank body 1 monitored by the water level sensor. Specifically, a first input end of the controller is in signal connection with an output end of the water level sensor, and a first output end of the controller is in signal connection with a control end of the water replenishing valve 10.
The slag conveyor adopts a self-balancing mode of supplementing water and water loss, the supplementing water is supplemented into the upper groove body 1 through a water supplementing pipeline 8, the requirement of system evaporation cooling is met, and overflow can be avoided during normal operation through water quantity control. The specific concept of the cooling water quantity balance is as follows: the water quantity of the cooling water is kept basically balanced with the water evaporation and the loss water quantity taken away along with the slag, meanwhile, the water supplementing quantity is not more than the loss water quantity, and if the water level in the upper tank body 1 of the slag conveyor is reduced to a low water level, the water supplementing valve 10 is controlled to be opened until the water quantity in the upper tank body 1 reaches a normal water level. Generally, in a working water tank of the slag conveyor, the water depth of a low water level is not less than 2000mm, and the water depth of a high water level can reach 2500 mm.
In practical application, when the dragveyer meets the circumstances such as the increase of the ash sediment volume of the boiler, the water temperature of the upper groove body 1 can be increased instantly by more than 70 ℃, in order to make the dragveyer operate better, the water temperature under the working condition needs to be cooled, therefore, the device further comprises: and the water temperature sensor is arranged in the upper tank body 1 of the slag conveyor and is used for monitoring the water temperature in the upper tank body 1. Correspondingly, a first input end of the controller is in signal connection with the water temperature sensor, and a first output end of the controller is in signal connection with the water replenishing valve 10, so that the controller is used for controlling the opening and closing of the water replenishing valve 10 according to the water temperature in the upper tank body 1 monitored by the water temperature sensor. When the water temperature exceeds 70 ℃, the temperature sensor sends a signal to the controller, and the controller then controls the water replenishing valve 10 to be opened, so that the cooling water is rapidly replenished into the upper tank body 1 until the water temperature is reduced to be less than 70 ℃.
This device still includes: and the water level scale marks are arranged in the upper groove body 1 of the slag conveyor, so that the field observation of operators is facilitated. In order to better monitor the water level, the device also comprises: the camera is provided with a lens aligned with the water level scale mark and used for shooting an image containing the water level scale mark, correspondingly, a second input end of the controller is further in signal connection with an output end of the camera, and a second output end of the controller is connected with a starting end of the reminding module, so that the controller identifies the water level of the upper tank body 1 according to the water level scale mark image shot by the camera and judges whether the water level of the upper tank is consistent with the water level of the upper tank obtained by the water level sensor or not, if the water level of the upper tank is not consistent with the water level of the upper tank, the reminding module sends reminding information which can be a sound reminder, the reminding module is a sound alarm, and the alarm sound sent by the alarm represents that the; the prompting information can be light prompting, the prompting module is an LED lamp, and the LED lamp is lightened or flickers to represent that the water levels are inconsistent; the prompt message can be a text prompt, the prompt module is a display at the moment, and the displayed text contains information of inconsistent water levels. Through the dual control of camera and level sensor, prevent to go up the condition emergence that the water level is less than the default in the cell body 1. Meanwhile, managers can remotely monitor the water level condition in the upper tank body 1 and whether the hot slag water splashes outwards through the camera.
In order to effectively control the water level in the cistern 5 and the pH value of the mixed waste water after the neutralization in the cistern 5, set up pH meter and level gauge (or called level sensor) in the cistern 5, set up desulfurization waste water control valve on desulfurization waste water pipeline 6, the fourth input of controller still with the output end signal connection of pH meter, the fifth input of controller still with the output end signal connection of this level gauge, the third output of controller still with desulfurization waste water control valve's control end signal connection, so that the controller controls the opening and closing of moisturizing people according to the pH value that the pH meter was monitored and the liquid level that the level gauge was monitored.
This device still includes: and the baffle is arranged on the outer side of the upper groove body 1 of the slag conveyor and is used for preventing hot slag water from splashing outwards and realizing effective monitoring of water quantity.
The slag water pipeline 3 needs to have the functions of wear resistance, corrosion resistance, scale inhibition and the like, so that the slag water pipeline 3 adopts a pipeline with the inner surface coated with KN17 wear-resistant and corrosion-resistant ceramic coating, can effectively resist the corrosion of chloride ions, and effectively reduces the replacement frequency.
The chain, the driving chain wheel, the scraper and the guide wheel in the slag extractor adopt high-chromium nickel molybdenum (CrNiMo) base alloy steel, and the material has good wear resistance and corrosion resistance and can adapt to the working condition of desulfurization waste water as a water replenishing source. The slag conveyor adopts the anticorrosion measures of a sacrificial anode and an anticorrosion coating. The sacrificial anode protection method is a method for preventing metal corrosion, namely, metal with strong reducibility is used as a protective electrode and is connected with protected metal to form a primary battery, the metal with strong reducibility is used as a negative electrode to generate oxidation reaction and be consumed, and the protected metal is used as a positive electrode to avoid corrosion.
The water seal insert plate is welded and hung on the lower header of the water-cooled wall at the lower part of the hearth. The water seal inserting plate is inserted into the water seal groove to absorb the expansion of the heating surface of the hearth and ensure the sealing of the boiler.
The transition slag well is lined with a wear-resistant and fire-resistant heat-insulating layer, the bottom of the transition slag well is provided with a hydraulic shutoff door, and the well body is provided with a flushing nozzle and a coking hole. The height design of the boiler water seal inserting plate inserted into the water immersion groove is adapted to the pressure protection value of the boiler hearth, 4 liquid level measuring points are arranged in the water seal groove and are interlocked with the water inlet valve to ensure the sealing of the boiler.
The angle of the transitional slag well is not less than 45 degrees, the structure of the slag hopper has enough strength and stability, and the supporting structure can bear the falling impact of large coke slag and the load of a large amount of accumulated coke slag in abnormal operation.
All pipelines and valves of sealing water, cold slag water, overflow water and the like, and the valves on the main pipes are required to be electrically operated valves and controlled in a local control box.
The overflow water device of the scraper slag conveyor is provided with a sawtooth overflow weir and a plug-in stainless steel parallel inclined plate clarifier, so that the concentration of suspended matters carried by the clarifier is not more than 500 mg/l. A sawtooth-shaped overflow weir and a parallel inclined plate clarifier are arranged between the front guide wheel and the rear guide wheel, and the length of the clarifier is about 36 m. Each inclined plate of the parallel inclined plate clarifier is independently installed, and is convenient to disassemble and replace. The inclination angle of the inclined plate is 60 degrees, and five layers are arranged. The upper groove body drain valve adopts an anti-blocking disc core type which is not easy to block and can not cause difficult opening and closing due to corrosion.
The boiler slag treatment process is generally:
slag at the bottom of the furnace → water seal of a slag discharge port or a transitional slag well → a scraper slag dragger → a slag bin → solid wet slag loading and outward transportation, and slag water enters a slag water clarification tank.
The utility model also provides a desulfurization waste water treatment method, include:
(1) mixing the desulfurization waste water with slag water (including slag water generated after dehydration of wet slag and slag water overflowing from an upper groove body of a slag conveyor under abnormal conditions) generated in the slag removing process of a wet slag removing system, and performing neutralization reaction to obtain neutral or weakly alkaline mixed waste water,
preferably, the pH of the neutral or weakly alkaline mixed wastewater is 7-9; more preferably, slag water generated in the deslagging process of the slag remover is subjected to clarification treatment.
(2) And (3) using the neutral or weakly alkaline mixed wastewater, namely supplementing the neutral or weakly alkaline mixed wastewater into an upper groove body of a slag dragging machine of the wet slag removal system to be used as cooling water of slag or introducing the neutral or weakly alkaline mixed wastewater into a water seal groove at the bottom of a boiler.
Filtering the neutral or weakly alkaline mixed wastewater, and supplementing the neutral or weakly alkaline mixed wastewater into an upper tank body of a slag conveyor to be used as cooling water of slag or introducing the neutral or weakly alkaline mixed wastewater into a water seal tank at the bottom of a boiler; the device used for filtering is a filter screen;
the time for supplementing the neutral or weakly alkaline mixed wastewater into the upper tank body of the slag conveyor of the wet slag removal system is realized by control steps, and the control steps comprise: the controller is connected with a water level sensor arranged in the upper tank body of the slag conveyor and a water replenishing valve for controlling the neutral or weakly alkaline mixed wastewater, and the controller controls the opening and closing of the water replenishing valve according to the water level in the upper tank body monitored by the water level sensor;
preferably, the controlling step further comprises: the controller is further connected with the water temperature sensor arranged in the upper tank body of the slag conveyor, and the controller controls the opening and closing of the water replenishing valve according to the water temperature in the upper tank body monitored by the water temperature sensor.
The characteristic pollutants in the desulfurization wastewater are mainly fluorides, sulfides and heavy metals. Mixing the desulfurization wastewater with the pH value of 5.0-5.7 with slag water with the pH value of about 12-13, and controlling the two types of water to be weakly alkaline after neutralization, such as controlling the pH value to be 7-9. The obtained mixed wastewater can not corrode subsequent equipment. And part of impurities such as suspended matters in the mixed wastewater are adsorbed by the waste residues, so that the content of the suspended matters is effectively reduced, and part of heavy metal ions can be precipitated after being mixed with the alkaline slag water. Before the mixed wastewater is completely introduced into the zero-overflow wet-type mechanical slag removal system, the amount of the mixed wastewater is less than or equal to the sum of water taken away by radiation evaporation of a boiler and water taken away by wet slag removal, which is related to the area of the water amount evaporated by the radiation of the boiler and a slag falling port, and the water taken away by slag transportation of a wet-type mechanical slag removal system vehicle accounts for 25-30% of the total slag amount. When the conventional condition 1 1000MW unit is in zero overflow, the water supply amount is 15-30 t/h, and the water balance and the heat balance can be achieved.
To sum up, the embodiment of the utility model provides a beneficial effect that technical scheme brought is: the slag remover is provided with the slag remover, the slag bin and the reservoir, the slag remover is arranged below a slag discharging port of a boiler and is used for collecting and cooling slag generated by the operation of the boiler to obtain wet slag, then the wet slag is conveyed, a discharging port of the slag bin is communicated with a discharging port of the slag remover, a slag discharging port of the slag bin is used for discharging the wet slag dehydrated by the slag bin, an overflow port of the slag bin is used for discharging slag water obtained in the dehydration treatment process of the slag bin, the slag water enters the reservoir after being clarified and is mixed with desulfurization wastewater to obtain mixed wastewater with a specific pH value, a water outlet of the reservoir is communicated with a cooling water inlet of the slag remover through a water replenishing pipeline, the neutralization of the desulfurization wastewater and the slag water is realized, then the neutralized mixed wastewater is used as the slag remover and water seal for replenishing water, a large amount of water resources with high quality are saved, and the zero discharge of the desulfurization wastewater can be realized, so that the device has the, The comprehensive energy saving can reach 30%, the waste water saving and zero discharge operation cost can reach more than 90%, and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an utilize wet-type slagging-off evaporation to deal with desulfurization waste water device which characterized in that, the device includes:
a wet slag removal system for removing slag discharged from the boiler and generating slag water; and
the water inlet of the water storage tank is communicated with the water outlet of the desulfurization wastewater conveying pipeline and the slag water outlet of the wet-type slag removal system and is used for collecting mixed desulfurization wastewater and slag water from the wet-type slag removal system;
the reservoir is also communicated with a cooling water inlet of the wet slag removal system; the mixed wastewater in the reservoir is used as a slag cooling water source of the wet slag removal system;
the wet slag removal system includes:
the slag dragging machine is arranged below a slag discharging port of the boiler and is used for collecting and cooling slag generated by the operation of the boiler to obtain wet slag and then conveying the wet slag;
the slag bin is communicated with the slag conveyor and is used for collecting wet slag from the slag conveyor and dehydrating the wet slag to obtain dehydrated wet slag and slag water; and
the slag water clarifying pool is communicated with a slag water outlet of the slag bin and is used for collecting and clarifying the slag water from the slag bin;
a water outlet of the reservoir is communicated with a cooling water inlet of the slag conveyor; and the water inlet of the reservoir is communicated with the overflow port of the slag water clarification tank.
2. The apparatus of claim 1, wherein the slag water clarifier is further in communication with an overflow port of the upper trough body of the slag conveyor for receiving the slag water overflowing from the upper trough body of the slag conveyor in abnormal situations.
3. The apparatus of claim 1, further comprising:
the filter screen is arranged on a water outlet pipeline of the reservoir;
and the slag water pump is arranged on a water replenishing pipeline communicated with the water storage tank and a cooling water inlet of the wet-type slag removal system and used for pumping the mixed wastewater filtered by the filter screen into the wet-type slag removal system.
4. The apparatus of claim 3, further comprising:
and the sewage discharge door is arranged at the inlet end and the outlet end of the filter screen.
5. The apparatus of claim 3, further comprising:
the electronic scale inhibitor is arranged on the water replenishing pipeline and is positioned on the outlet side of the slag water pump;
the electronic scale inhibitor is based on the alternating electromagnetic field principle.
6. The apparatus of claim 5, further comprising:
the water level sensor is arranged in an upper tank body of the slag conveyor;
the water replenishing valve is arranged on the water replenishing pipeline; and
and the controller is connected with the water level sensor and the water replenishing valve and is used for controlling the water replenishing valve to be opened and closed according to the water level in the upper tank body monitored by the water level sensor.
7. The apparatus of claim 6, further comprising:
the water temperature sensor is arranged in an upper tank body of the slag conveyor;
correspondingly, the controller is connected with the water temperature sensor and used for controlling the opening and closing of the water replenishing valve according to the water temperature in the upper tank body monitored by the water temperature sensor.
8. The apparatus of claim 6, further comprising:
the water level scale lines are arranged in the upper tank body of the slag conveyor;
the lens of the camera is aligned to the water level scale mark;
correspondingly, the controller is connected with the camera signal output end and used for identifying the water level of the upper tank body according to the water level scale line image shot by the camera, judging whether the water level of the upper tank body is consistent with the water level of the upper tank body obtained by the water level sensor or not, and sending prompt information if the water level of the upper tank body is not consistent with the water level of the upper tank body obtained by the water level sensor.
9. The device of claim 8, wherein a PH meter and a liquid level meter are arranged in the reservoir, a desulfurization wastewater control valve is arranged at a desulfurization wastewater inlet end of the reservoir, the controller is further connected with a signal output end of the PH meter, a signal output end of the liquid level meter and the desulfurization wastewater control valve, and the controller controls the desulfurization wastewater control valve to be opened or closed according to the PH value monitored by the PH meter and the liquid level monitored by the liquid level meter.
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| CN201920605139.7U CN210367320U (en) | 2019-04-28 | 2019-04-28 | Device for treating desulfurization wastewater by wet slag removal and evaporation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110002661A (en) * | 2019-04-28 | 2019-07-12 | 国电龙源电力技术工程有限责任公司 | Method for treating desulfurized wastewater and utilization wet slag removal evaporation disposition desulfurization wastewater device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002661A (en) * | 2019-04-28 | 2019-07-12 | 国电龙源电力技术工程有限责任公司 | Method for treating desulfurized wastewater and utilization wet slag removal evaporation disposition desulfurization wastewater device |
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