CN111943529A - Lime slurry preparation system for waste incineration and supply method - Google Patents
Lime slurry preparation system for waste incineration and supply method Download PDFInfo
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- CN111943529A CN111943529A CN202010890437.2A CN202010890437A CN111943529A CN 111943529 A CN111943529 A CN 111943529A CN 202010890437 A CN202010890437 A CN 202010890437A CN 111943529 A CN111943529 A CN 111943529A
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 342
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 342
- 239000004571 lime Substances 0.000 title claims abstract description 342
- 239000002002 slurry Substances 0.000 title claims abstract description 270
- 238000002360 preparation method Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004056 waste incineration Methods 0.000 title abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 238000003860 storage Methods 0.000 claims abstract description 12
- 239000000376 reactant Substances 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000008235 industrial water Substances 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003546 flue gas Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 9
- 238000000746 purification Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/08—Devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7176—Feed mechanisms characterised by the means for feeding the components to the mixer using pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a lime slurry preparation system for refuse incineration, which can adjust the concentration of lime slurry at any time, can be used for quickly preparing lime slurry, can be conveyed in a short distance, can ensure the precision of the preparation concentration of the lime slurry, and can reduce the material consumption on the premise of ensuring the standard emission of flue gas, thereby improving the flue gas purification efficiency and saving the material consumption. The lime slurry preparation tank, the lime intermediate bin and the lime slurry supply tank are arranged at the top of the atomizer reaction tower for supplying reactants; the lime intermediate bin is connected with a general lime storage bin through a conveying device, and lime in the lime intermediate bin is connected with a lime slurry preparation tank through a feeding device; a concentration detection device is arranged in the lime slurry preparation tank, an overflow port is arranged in the lime slurry preparation tank, and the lime slurry meeting the preset proportioning concentration flows into the lime slurry supply tank through the overflow port; the lime slurry supply tank is communicated with a reactant inlet of the atomizer reaction tower through a feeding pipeline. Meanwhile, the invention also discloses a lime slurry supply method for waste incineration.
Description
Technical Field
The invention relates to the technical field of incineration flue gas purification, in particular to a lime slurry preparation system for waste incineration and a supply method.
Background
In a waste incineration flue gas purification system, lime slurry is an important raw material for removing acid gas. In a flue gas purification plant, quicklime (or hydrated lime) is slaked to prepare lime slurry. Lime slurry with the concentration of 8-15% is provided to a rotary sprayer of the reaction tower through the preparation system, the lime slurry is atomized by the atomizer and reacts with acidic substances in the flue gas in the reaction tower, and therefore the aim of deacidification is achieved.
In the prior art, a common method for preparing lime slurry is a mass ratio method, however, both methods are prepared by adopting a large container arranged on the ground, and prepared lime slurry is conveyed to the top of a reaction tower through a long-distance pipeline by a feed pump; the equipment selection is large, the concentration adjustment process is slow, and the preparation time is long; in addition, in the conveying process, the conveying distance is long, and a lime slurry conveying pipeline is easy to block; meanwhile, in the preparation process, the error between the actual concentration and the set concentration is large, the consumption of materials is difficult to effectively control, and the difficulty of controlling the flue gas emission index is increased.
Disclosure of Invention
In order to solve the problems of low preparation speed, long transportation distance and inaccurate control of reactant concentration in the lime slurry preparation process in the prior art, the invention provides a lime slurry preparation system for refuse incineration, which can adjust the lime slurry concentration at any time, can be used for quickly preparing lime slurry, can be conveyed in a short distance, can ensure the precision of the lime slurry preparation concentration, and can reduce the material consumption on the premise of ensuring the flue gas emission to reach the standard, thereby improving the flue gas purification efficiency and saving the material consumption. Meanwhile, the invention also discloses a lime slurry supply method for waste incineration.
The technical scheme of the invention is as follows: a lime slurry preparation system for refuse incineration, comprising: lime thick liquid preparation jar, its characterized in that: the lime slurry feeding device also comprises a lime intermediate bin and a lime slurry feeding tank; the lime slurry preparation tank, the lime intermediate bin and the lime slurry supply tank are all arranged at the top of an atomizer reaction tower which supplies reactants;
the lime intermediate bin is connected with a total lime storage bin through a conveying device, and lime in the lime intermediate bin is connected with the lime slurry preparation tank through a feeding device; a concentration detection device is arranged in the lime slurry preparation tank, an overflow port is arranged in the lime slurry preparation tank, and the lime slurry meeting the preset proportioning concentration flows into the lime slurry supply tank through the overflow port; the lime slurry supply tank is communicated with a reactant inlet of the atomizer reaction tower through a feeding pipeline; the concentration detection device, the feeding device and the conveying device are electrically connected with a controller.
It is further characterized in that:
the feeding device is a variable-frequency quantitative feeding screw;
the feeding pipeline is provided with a variable-frequency booster pump, and the variable-frequency booster pump is controlled by a pressure transmitter; the variable-frequency booster pump and the pressure transmitter are electrically connected with the controller;
a double-blade stirrer and a preparation tank liquid level meter are arranged in the lime slurry preparation tank;
a lime slurry replenishing pump is arranged between the lime slurry preparation tank and the lime slurry supply tank; the lime slurry replenishing pump is electrically connected with the controller;
and a lime slurry circulating pump is arranged in the lime slurry preparation tank.
A lime slurry supply method for refuse incineration, characterized by comprising the steps of:
s1: inputting lime from a lime storage bin to a lime intermediate bin through a conveying device;
s2: injecting pre-injected water into the lime slurry preparation tank according to the pre-set pre-injected water amount;
s3: injecting lime in the lime intermediate bin and industrial water into the lime slurry preparation tank;
s4: the controller monitors the real-time concentration of the lime slurry in the lime slurry preparation tank in real time through a concentration detection device; comparing the real-time concentration with a preset target concentration;
if the two are not equal, controlling the injection amount of the industrial water through a water amount regulating valve, controlling the injection amount of lime in the lime intermediate bin through a feeding device, and adjusting the real-time concentration until the real-time concentration is equal to the target concentration;
s5: when the liquid level of the lime slurry in the lime slurry preparation tank reaches an overflow port, the lime slurry flows into a lime slurry supply tank in an overflow mode;
s6: and monitoring the liquid level height of the lime slurry in the lime slurry supply tank in real time, and feeding the atomizer reaction tower from top to bottom based on the self gravity of the lime slurry through a feeding pipeline when the lime slurry reaches a preset height.
It is further characterized in that:
in the step S6, a variable frequency booster pump is arranged on the feeding pipeline, and when the lime slurry does not reach the preset height and needs to be fed to the atomizer reaction tower, the lime slurry in the feeding pipeline is pressurized through the variable frequency booster pump, so that feeding to the atomizer reaction tower is realized; the controller regulates and controls the variable-frequency booster pump through a pressure signal given by the pressure transmitter, and further controls the pressure of the lime slurry in the feeding pipeline;
monitoring the lime slurry liquid level height in the lime slurry preparation tank in real time through a preparation tank liquid level meter so as to control the lime slurry preparation speed in the lime slurry preparation tank; monitoring the liquid level height of the lime slurry in the lime slurry supply tank in real time, and controlling the liquid level height of the lime slurry in the lime slurry supply tank to be within an allowable range through a feed regulating valve arranged between the lime slurry preparation tank and the lime slurry supply tank;
when the real-time concentration of the lime slurry in the lime slurry preparation tank needs to be changed, closing an outlet cut-off valve of the overflow port, injecting water and lime powder into the lime slurry preparation tank, and changing the original concentration of the lime slurry; after the concentration of the lime slurry is adjusted, the outlet cut-off valve of the overflow port is opened again, and the lime slurry flows into the lime slurry supply tank in an overflow mode; during the closing of the outlet shut-off valve of the overflow opening, a controller draws lime slurry from the lime slurry preparation tank by means of a lime slurry make-up pump into the lime slurry feed tank.
The lime slurry preparation system for refuse incineration provided by the invention abandons the preparation method of a large container in the prior art, places a preparation device of lime slurry on the top of an atomizer reaction tower, and adopts a small container to prepare the lime slurry based on an overflow method; aiming at the concentration required by the reaction tower of the atomizer, the concentration of the lime slurry is adjusted according to actual needs through the cooperation of the concentration detection device and the feeding device, the concentration of the lime slurry is accurately controlled, the accurate input of the lime slurry is ensured, and the flue gas purification efficiency is improved on the basis of reducing the material consumption; the lime slurry in the lime slurry supply tank is conveyed to the reaction tower by virtue of self gravity, and the lime slurry is conveyed in a short distance, so that the loss in the conveying process is reduced, the problems of blockage and the like in the conveying process are avoided, and the later maintenance cost of equipment is reduced; by arranging the lime slurry circulating pump in the lime slurry preparation tank, the concentration change speed in the preparation process is further increased, the preparation time is shortened, and meanwhile, the precipitation is further prevented.
Drawings
FIG. 1 is a schematic view showing the construction of a lime slurry preparation system for incineration of garbage according to the present invention;
fig. 2 is an enlarged schematic view of a structure at a.
Detailed Description
As shown in fig. 1 to 2, the present invention provides a lime slurry preparation system for waste incineration, comprising: a lime slurry preparation tank 4, a lime intermediate bin 3 and a lime slurry supply tank 5; the lime slurry preparation tank 4, the lime intermediate bin 3 and the lime slurry supply tank 5 in the whole system are all arranged at the top of the atomizer reaction tower 2 for supplying reactants; an air inlet 6 of the atomizer reaction tower 2 is connected with a tail gas outlet of the waste incineration device, and tail gas deacidified in the atomizer reaction tower 2 is connected with a subsequent tail gas treatment device through a tail gas port 7.
The general lime storage bin 1 arranged on the ground is connected with a lime intermediate bin 3 through a conveying device, and one large lime storage bin 1 can be simultaneously communicated with a plurality of lime intermediate bins 3 through pipelines 1-1 and 1-2, namely lime raw materials are simultaneously supplied to a plurality of lime slurry preparation systems; because the lime intermediate bin 3 is positioned at the top of the reaction tower, and the lime storage bin 1 is positioned on the ground, the lime storage bin 1 adopts a pneumatic conveying mode to convey lime powder in the lime storage bin 1 to different lime intermediate bins 3; the lime storage bin 1 and the lime intermediate bin 3 are matched for use, so that the lime slurry preparation system provided by the invention adopts a small tank uninterrupted preparation mode.
The top of the lime intermediate bin 3 is provided with a bin top dust remover 8 which is connected with a compressed air conveying device through an air pipeline 9 and is input into the bin top dust remover 8, and dust-containing air in the lime intermediate bin 3 is conveyed out of the bin after being treated by a dust removing fan 10; the arrangement of the dust remover 8 on the top of the bin ensures that the lime intermediate bin 3 cannot cause safety problems due to overhigh air pressure in the bin.
The lime in the lime intermediate bin 3 is connected with a lime slurry preparation tank 4 through a feeding device 12; a concentration detection device 34 is arranged in the lime slurry preparation tank 4, an overflow port 25 is arranged in the lime slurry preparation tank 4, and the lime slurry meeting the preset proportioning concentration flows into the lime slurry supply tank 5 through the overflow port 25; the lime slurry preparation tank 4 is connected with a tap water inlet through a water pipe 26, a tap water flow meter 28 is arranged to monitor the water inlet amount in the lime slurry preparation tank 4 in real time, a tap water cut-off valve 27 is arranged to control the switch of the water inlet of the lime slurry preparation tank 4, and a water amount regulating valve 29 is arranged to control the injection amount of industrial water.
The lime slurry supply tank 5 is communicated with a reactant inlet of the atomizer reaction tower 2 through a feeding pipeline 35; the concentration detecting device 34, the feeding device 12 and the conveying device are electrically connected with a controller (not marked in the figure). In this embodiment, the feeding device 12 is implemented by a dosing screw based on frequency conversion, before lime in the lime intermediate bin 3 is conveyed to the dosing screw, a rapping motor 11 is arranged at an outlet of the lime intermediate bin 3 to vibrate the wall, so that unsmooth blanking caused by lime deposition at the outlet of the lime intermediate bin 3 is avoided.
A double-blade type stirrer 14 is arranged in the lime slurry preparation tank 4, so that the lime slurry is fully stirred; a feed liquid stirrer 16 is also arranged in the lime slurry feed tank 5 to stir the lime slurry fed to the atomizer reaction tower 2, so that the possibility of precipitation of the lime slurry in the feed pipeline 35 is reduced; a lime slurry circulating pump 15 is arranged in the lime slurry preparation tank 4, and in the preparation process, the lime slurry in the lime slurry preparation tank 4 circularly flows through the lime slurry circulating pump 15, so that the change speed of the concentration of the lime slurry is accelerated, the preparation time is shortened, and the lime slurry in the lime slurry preparation tank 4 is prevented from precipitating; in the lime slurry preparation process in the lime slurry preparation tank 4, the lime powder and water can react to generate steam, so a sprayer 13 and an exhaust fan 30 are arranged to cool and discharge the steam.
A lime slurry replenishing pump 31 is arranged between the lime slurry preparation tank 4 and the lime slurry supply tank 5, and the lime slurry replenishing pump 31 is electrically connected with a controller; the lime slurry feeding pump 31 is connected to the lime slurry preparation tank 4 through one end of a lime slurry feeding temporary pipe 33, and the other end interface 32 is connected to the inside feed of the lime slurry feeding tank 5.
The feeding pipeline 35 is provided with a variable-frequency booster pump 20, the variable-frequency booster pump 20 is controlled by a pressure transmitter 17, and the variable-frequency booster pump 20 is electrically connected with a controller; meanwhile, a feeding amount measuring flowmeter 19 is provided on the feeding pipe 35 to monitor the flow rate of the lime slurry fed into the atomizer reaction tower 2 in real time.
Lime slurry feeding method implemented based on lime slurry preparation system for refuse incineration, comprising the following steps.
S1: lime is conveyed from the lime storage silo 1 to the lime intermediate silo 3 by a conveying device.
S2: and injecting pre-injected water into the lime slurry preparation tank 4 according to the pre-set pre-injected water quantity.
S3: lime in the lime intermediate bin 3 and industrial water are injected into the lime slurry preparation tank 4.
S4: the controller monitors the real-time concentration of the lime slurry in the lime slurry preparation tank 4 in real time through the concentration detection device 34; comparing the real-time concentration with a preset target concentration;
if the two are not equal, the injection amount of the industrial water is controlled through the water amount regulating valve 29, the injection amount of the lime in the lime intermediate bin 3 is regulated and controlled through the quantitative feeding spiral frequency conversion of the feeding device 12, the real-time concentration is regulated until the real-time concentration is equal to the target concentration, the injection amounts of the industrial water and the lime are kept unchanged, and the industrial water and the lime are continuously put into the lime slurry preparation tank 4.
When the real-time concentration of the lime slurry in the lime slurry preparation tank 4 needs to be changed, the outlet cut-off valve 24 of the overflow port 25 is closed, water and lime powder are injected into the lime slurry preparation tank 4, and the real-time concentration of the original lime slurry is changed; after the concentration of the lime slurry is adjusted, the outlet cut-off valve 24 of the overflow port 25 is opened again, and the lime slurry flows into the lime slurry supply tank 5 in an overflow mode; during the closing of the outlet shut-off valve 24 of the overflow port 25, the controller draws the lime slurry from the lime slurry preparation tank 4 to the lime slurry supply tank 5 by the lime slurry make-up pump 31, ensuring that the lime slurry supply tank 5 can continuously feed the atomizer reaction tower 2, and the deacidification operation in the atomizer reaction tower 2 can be normally performed even during the lime slurry concentration adjustment in the lime slurry preparation tank 4, without stopping the deacidification operation in the atomizer reaction tower 2 due to the lime slurry concentration adjustment in the lime slurry preparation tank 4.
A preparation tank liquid level meter 36 is arranged in the lime slurry preparation tank 4, and the liquid level height of the lime slurry in the lime slurry preparation tank 4 is monitored in real time through the preparation tank liquid level meter 36 electrically connected with the controller so as to control the preparation speed of the lime slurry in the lime slurry preparation tank 4; when the liquid level of the lime slurry is too high or too low, the controller adjusts the water quantity adjusting valve 29 and the feeding speed of the feeding device 12, and further adjusts the lime slurry preparation speed in the lime slurry preparation tank 4.
S5: when the lime slurry level in the lime slurry preparation tank 4 reaches the overflow 25, the lime slurry flows into the lime slurry feed tank 5 by means of overflow.
S6: monitoring the height of lime slurry in the lime slurry supply tank 5 in real time, and feeding the atomizer reaction tower 2 from top to bottom through a feeding pipeline 35 based on the gravity of the lime slurry when the height of the lime slurry reaches a preset height; in this embodiment, the lime slurry feed tank 5 is provided with a feed tank level meter 22 for monitoring the reagent level in the lime slurry feed tank 5 in real time; once the liquid level reaches the preset height, the controller starts to control the lime slurry supply tank 5 to feed the reaction tower; a reactant outlet of the lime slurry supply tank 5 is provided with a feeding outlet electromagnetic valve 21, and before feeding, the controller opens the feeding outlet electromagnetic valve 21 to prepare for feeding; in case of an unexpected need to shut off the feed, the feed outlet solenoid valve 21 is directly closed.
Because the atomizer has certain requirements on the lime slurry pressure, the conventional pressure is about 2Kg, and when the lime slurry in the lime slurry supply tank 5 can not reach the preset height for some reasons, the lime slurry in the lime slurry supply tank 5 only has the self weight of liquid and can not meet the requirements; therefore, the material pipe 35 is provided with the variable frequency booster pump 20, when the lime slurry height does not reach the preset height and the atomizer reaction tower 1 needs to be fed, the lime slurry in the material pipe 35 is pressurized, so that the lime slurry pressure reaches the expected requirement; the controller provides a pressure signal through the pressure transmitter 17 to regulate and control the variable-frequency booster pump 20, and further controls the pressure of the lime slurry in the feeding pipeline 35, so that the pressure of the lime slurry is stable. And then monitoring is carried out according to the smoke emission parameters of the atomizer reaction tower 2, and the feeding amount input into the atomizer reaction tower 2 is adjusted through the adjusting valve 18.
A feeding regulating valve 23 is arranged on a feeding pipeline between the lime slurry preparation tank 4 and the lime slurry supply tank 5; two liquid level height thresholds are preset for the lime slurry feed tank 5: high warning liquid level, low warning liquid level; the liquid level height of the lime slurry in the lime slurry supply tank 5 is monitored in real time, when the liquid level height monitored by the liquid level meter 22 of the lime slurry supply tank is higher than a high-warning liquid level or lower than a low-warning liquid level, the liquid supply amount of the lime slurry preparation tank 4 to the lime slurry supply tank 5 is increased or decreased through the feed adjusting valve 23, the lime slurry supply tank 5 is ensured to be capable of reasonably feeding the atomizer reaction tower 2, or the problem that the lime slurry in the lime slurry supply tank 5 overflows when the liquid level is too high is prevented.
According to the technical scheme, a lime slurry preparation system is arranged for each atomizer reaction tower in a matched manner, a lime slurry preparation tank, a lime intermediate bin and a lime slurry supply tank in the system are all arranged on the top of the atomizer reaction tower for supplying reactants, the lime slurry concentration is pertinently adjusted at any time according to different conditions occurring in the production process of each atomizer reaction tower, the precision of the lime slurry preparation concentration is ensured, further the deacidification reaction of the atomizer reaction tower is ensured to be fully carried out, and the tail gas emission index is ensured to stably reach the standard; this system can adopt PLC independent control or through whole factory DCS centralized control, not only can prepare the production in succession, still can adjust lime slurry preparation concentration fast, the different condition that appears in the production process of coming the reply, the mode of the high-power lime slurry circulation feed pump and the long pipeline of having cancelled a plurality of atomizer reaction towers sharing simultaneously carries, long pipeline conveying pipe blockage problem has not only been avoided, the unnecessary energy consumption problem in the operation process has still been reduced, reach the effect of accurate control and save material consumption simultaneously, the running cost has still been saved simultaneously.
Claims (10)
1. A lime slurry preparation system for refuse incineration, comprising: lime thick liquid preparation jar, its characterized in that: the lime slurry feeding device also comprises a lime intermediate bin and a lime slurry feeding tank; the lime slurry preparation tank, the lime intermediate bin and the lime slurry supply tank are all arranged at the top of an atomizer reaction tower which supplies reactants;
the lime intermediate bin is connected with a total lime storage bin through a conveying device, and lime in the lime intermediate bin is connected with the lime slurry preparation tank through a feeding device; a concentration detection device is arranged in the lime slurry preparation tank, an overflow port is arranged in the lime slurry preparation tank, and the lime slurry meeting the preset proportioning concentration flows into the lime slurry supply tank through the overflow port; the lime slurry supply tank is communicated with a reactant inlet of the atomizer reaction tower through a feeding pipeline; the concentration detection device, the feeding device and the conveying device are electrically connected with a controller.
2. The lime slurry for incineration of waste preparation system according to claim 1, wherein: the feeding device is a variable-frequency quantitative feeding screw.
3. The lime slurry for incineration of waste preparation system according to claim 1, wherein: the feeding pipeline is provided with a variable-frequency booster pump, and the variable-frequency booster pump is controlled by a pressure transmitter; the variable frequency booster pump and the pressure transmitter are electrically connected with the controller.
4. The lime slurry for incineration of waste preparation system according to claim 1, wherein: the lime slurry preparation tank is internally provided with a double-blade stirrer and a preparation tank liquid level meter.
5. The lime slurry for incineration of waste preparation system according to claim 1, wherein: a lime slurry replenishing pump is arranged between the lime slurry preparation tank and the lime slurry supply tank; the lime slurry replenishing pump is electrically connected with the controller.
6. The lime slurry for incineration of waste preparation system according to claim 1, wherein: and a lime slurry circulating pump is arranged in the lime slurry preparation tank.
7. A lime slurry supply method for refuse incineration, characterized by comprising the steps of:
s1: inputting lime from a lime storage bin to a lime intermediate bin through a conveying device;
s2: injecting pre-injected water into the lime slurry preparation tank according to the pre-set pre-injected water amount;
s3: injecting lime in the lime intermediate bin and industrial water into the lime slurry preparation tank;
s4: the controller monitors the real-time concentration of the lime slurry in the lime slurry preparation tank in real time through a concentration detection device; comparing the real-time concentration with a preset target concentration;
if the two are not equal, controlling the injection amount of the industrial water through a water amount regulating valve, controlling the injection amount of lime in the lime intermediate bin through a feeding device, and adjusting the real-time concentration until the real-time concentration is equal to the target concentration;
s5: when the liquid level of the lime slurry in the lime slurry preparation tank reaches an overflow port, the lime slurry flows into a lime slurry supply tank in an overflow mode;
s6: and monitoring the liquid level height of the lime slurry in the lime slurry supply tank in real time, and feeding the atomizer reaction tower from top to bottom based on the self gravity of the lime slurry through a feeding pipeline when the lime slurry reaches a preset height.
8. The lime slurry for refuse incineration according to claim 1, wherein: in the step S6, a variable frequency booster pump is arranged on the feeding pipeline, and when the lime slurry does not reach the preset height and needs to be fed to the atomizer reaction tower, the lime slurry in the feeding pipeline is pressurized through the variable frequency booster pump, so that feeding to the atomizer reaction tower is realized; and the controller provides a pressure signal through the pressure transmitter to regulate and control the variable-frequency booster pump so as to control the pressure of the lime slurry in the feeding pipeline.
9. The lime slurry for refuse incineration according to claim 1, wherein: monitoring the lime slurry liquid level height in the lime slurry preparation tank in real time through a preparation tank liquid level meter so as to control the lime slurry preparation speed in the lime slurry preparation tank; and monitoring the liquid level height of the lime slurry in the lime slurry supply tank in real time, and controlling the liquid level height of the lime slurry in the lime slurry supply tank to be within an allowable range through a feed regulating valve arranged between the lime slurry preparation tank and the lime slurry supply tank.
10. The lime slurry for refuse incineration according to claim 1, wherein: when the real-time concentration of the lime slurry in the lime slurry preparation tank needs to be changed, closing an outlet cut-off valve of the overflow port, injecting water and lime powder into the lime slurry preparation tank, and changing the original concentration of the lime slurry; after the concentration of the lime slurry is adjusted, the outlet cut-off valve of the overflow port is opened again, and the lime slurry flows into the lime slurry supply tank in an overflow mode; during the closing of the outlet shut-off valve of the overflow opening, a controller draws lime slurry from the lime slurry preparation tank by means of a lime slurry make-up pump into the lime slurry feed tank.
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