CN214287557U - A doublestage dry process deacidification integrated equipment for sludge incineration flue gas - Google Patents
A doublestage dry process deacidification integrated equipment for sludge incineration flue gas Download PDFInfo
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- CN214287557U CN214287557U CN202022928278.9U CN202022928278U CN214287557U CN 214287557 U CN214287557 U CN 214287557U CN 202022928278 U CN202022928278 U CN 202022928278U CN 214287557 U CN214287557 U CN 214287557U
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Abstract
A double-stage dry deacidification complete device for sludge incineration flue gas belongs to the technical field of solid waste treatment. First delivery bunker pump top is connected to lime storage bunker bottom, lime buffering storehouse top is connected to first delivery bunker pump lower part discharge gate, second delivery bunker pump top is connected to lime storage bunker bottom, the lime jetting device on burning furnace one side upper portion is burnt in second delivery bunker pump lower part discharge gate connection, compressed air pipeline is connected with first delivery bunker pump, carry lime stone pipe connection lime stone storage bunker, the space fixed mounting sodium bicarbonate loading attachment directly over the sodium bicarbonate storage bunker, sodium bicarbonate storage bunker bottom connects gradually push-pull valve and rotary valve of unloading, the feed inlet of screw conveyer one end is connected to the other end of rotary valve of unloading, the feed inlet of grading grinder one end is connected to the discharge gate of the screw conveyer other end. The utility model discloses the deacidification is effectual, realizes flue gas processing system waste water zero release. The dry deacidification method is adopted, water is not needed to be added in the deacidification process, and the energy-saving property is remarkable.
Description
Technical Field
The utility model relates to a doublestage dry process deacidification integrated equipment for sludge incineration flue gas belongs to solid waste treatment technical field, is applicable to the deacidification of sludge incineration flue gas and handles.
Background
A large amount of acid gases such as sulfur dioxide and the like are generated in the sludge incineration treatment process. The flue gas deacidification process is numerous, and in the past research and engineering practice, wet deacidification is the main process form for removing sulfur oxides in incineration tail gas. However, wet deacidification is accompanied by the generation of a large amount of high-concentration salt-containing wastewater, which cannot be effectively treated by simple biochemical treatment, has complicated physicochemical treatment process and high treatment cost, and is recognized as high-difficulty wastewater treatment in the sewage treatment industry. The method is a fundamental method for solving the problem by reducing the generation of the salt-containing wastewater from the source and optimizing the deacidification treatment process route of the incineration tail gas.
The dry desulfurization process using the baking soda as the adsorbent has the advantages of high desulfurization efficiency, low consumption of desulfurizer, remarkable water and energy saving, low pollution of desulfurization products and the like, the generation of salt-containing wastewater is greatly reduced from the source, and simultaneously, the baking soda also has the function of absorbing hydrogen chloride, hydrogen fluoride and hydrogen bromide, and is matched with the front-end desulfurization treatment of adding limestone in the incinerator, so that the consumption of the baking soda at the rear end is reduced, the economy is improved, and the deacidification treatment effect of sludge incineration flue gas is further ensured. The baking soda desulfurization process has already occupied a large market share in the european flue gas desulfurization field. However, in China, wet deacidification still occupies the dominant position of the market due to the characteristics of low operation cost, mature process and the like.
Therefore, in order to meet the requirements of environmental protection and pollution control, it is urgent to develop a set of sludge incineration flue gas two-stage dry deacidification complete equipment with high treatment efficiency, high automation degree, low price and good adaptability to domestic sludge.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a doublestage dry process deacidification integrated equipment for sludge incineration flue gas can regard as the key supporting facility of sludge incineration processing system, realizes equipment localization completely, realizes the automation of sludge drying process control simultaneously to create the income through reducing the input cost.
A two-stage dry deacidification complete device for sludge incineration flue gas is characterized in that the bottom end of a limestone storage bin is connected with the top end of a first conveying bin pump, the lower discharge port of the first conveying bin pump is connected with the top end of a lime buffering bin, the bottom end of the limestone storage bin is connected with the top end of a second conveying bin pump, the lower discharge port of the second conveying bin pump is connected with a limestone blowing device on the upper part of one side of an incinerator, a compressed air pipeline is connected with the first conveying bin pump, a conveying limestone pipeline is connected with the limestone storage bin, a baking soda feeding device is fixedly installed in a space right above the baking soda storage bin, the bottom of the baking soda storage bin is sequentially connected with a gate valve and a discharge rotary valve, the other end of the discharge rotary valve is connected with a feed inlet at one end of a screw conveyor, a discharge port at the other end of the screw conveyor is connected with a feed inlet at one end of a grading grinder, and the side of the feed inlet at one end of the grading grinder is sequentially connected with a baking soda conveying fan and an air filter, the discharge port at the other end of the grading grinder is connected with a baking soda blowing device at the lower part of one side of the baking soda reaction tower, the upper part of one side of the baking soda reaction tower is connected with a bag-type dust remover, and the bottom end of the baking soda reaction tower is connected with an electrostatic dust remover through a flue gas pipeline.
The baking soda reaction tower is provided with a return port of fly ash of a bag-type dust remover. The other end of the electrostatic dust collector is connected with a waste heat boiler through a flue gas pipeline, and the other end of the waste heat boiler is connected with the incinerator through a flue gas pipeline. The top of the limestone storage bin is provided with a bin top bag-type dust remover, and the top of the baking soda storage bin is provided with a bin top bag-type dust remover.
A two-stage dry deacidification method for sludge incineration flue gas comprises the following steps:
and step 1, conveying limestone powder in the limestone storage bin into a lime buffering bin by a limestone conveying bin pump.
And 2, spraying limestone powder in the lime buffer bin into the incinerator through a limestone injection device by a conveying bin pump, and neutralizing acid gas in flue gas in the sludge incineration process to realize the first stage of two-stage dry desulfurization.
And 3, charging the baking soda into a baking soda storage bin through a baking soda feeding device.
And 4, conveying the baking soda in the baking soda storage bin to a baking soda grading grinder by a screw conveyer through a gate valve and a discharge rotary valve.
And 5, conveying the ground superfine baking soda powder to a baking soda reaction tower under the action of a conveying fan after air passes through an air filter.
And 6, spraying the soda powder into the reaction tower through a soda blowing device, and fully mixing the soda powder with the flue gas which comes out of the incinerator and sequentially passes through the waste heat boiler and the electrostatic dust collector, so that the second stage of the two-stage dry desulfurization is realized.
And 7, feeding the incineration flue gas desulfurized by the baking soda reaction tower into downstream equipment (a bag-type dust remover).
In the step 1, the limestone is conveyed by a bin pump, and a return pipeline returning to a limestone storage bin from the conveying bin pump is arranged, so that the sealing and leakage-free limestone conveying process is ensured.
And 6, fully mixing the baking soda and the flue gas in the reaction tower for more than 2 s.
And (4) in the baking soda conveying steps from step 3 to step 6, a negative pressure conveying mode is adopted, and a sealing device for preventing the baking soda from leaking is not required.
The baking soda reaction tower is provided with a return port of the fly ash of the bag-type dust remover, so that the fly ash returns to the tower.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the deacidification effect is good. The dry desulfurization process using the baking soda as the adsorbent has high desulfurization efficiency, can absorb the effects of hydrogen chloride, hydrogen fluoride and hydrogen bromide, has wider application range on acid gas in flue gas, more thorough deacidification treatment and SO treatment2The removal efficiency of the catalyst can reach more than 95 percent, and the catalyst can remove SO3The HCl and HCl removing efficiency can reach more than 98 percent.
(2) Can realize zero discharge of waste water of the flue gas treatment system. And the dry deacidification method is adopted, and water is not needed to be added in the deacidification process, so that the consumption of water resources is greatly saved.
(3) Avoid the generation and treatment of waste water. By adopting the dry deacidification, no wastewater is generated in the processes of limestone adding in the front-end incinerator for desulfurization or back-end sodium bicarbonate desulfurization, the pollution of deacidification products is small, subsequent wastewater treatment is not needed, and the problem that the traditional wet deacidification process generates high-concentration salt-containing wastewater along with the traditional wet deacidification process is solved from the source.
(4) The energy saving performance is remarkable. After the flue gas after the dry deacidification is subjected to cloth bag dust removal, the flue gas can be directly discharged without arranging a smoke prevention facility due to high temperature. Compared with wet deacidification, the process that the front end needs to be cooled and the rear end needs to be heated is omitted.
(5) And the field is environment-friendly. The limestone storage bin and the baking soda storage bin are both provided with bag-type dust collectors at the tops of the bins, so that dust is prevented from flying; the limestone is conveyed by a bin pump, so that the environmental pollution risk in the limestone conveying process is eliminated; the baking soda adopts a negative pressure conveying mode, so that the leakage of the baking soda is prevented, and the cleanness and sanitation of the engineering field environment are guaranteed.
(6) The baking soda adopts a negative pressure conveying mode, so that the temperature inside the grinder is reduced, the stability of the baking soda in the grinder is further ensured, and the hardening of the baking soda in the grinder is avoided.
(7) The fly ash of the bag-type dust remover flows back to the baking soda reaction tower, so that the mixing and reaction effects of the baking soda and the flue gas are further ensured.
Drawings
The invention itself, however, as well as many of the attendant advantages thereof, will be best understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein like reference numerals indicate like parts throughout the several views, and wherein:
FIG. 1 is a process flow diagram of a two-stage dry deacidification complete plant for sludge incineration flue gas according to an embodiment of the present invention.
Detailed Description
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The following further explanation is provided to facilitate understanding of the embodiments, and the embodiments do not constitute a limitation of the present invention.
Example 1: as shown in figure 1, the two-stage dry deacidification complete plant for sludge incineration flue gas comprises a limestone desulfurization device and a back sodium bicarbonate desulfurization device which are added into a front end incinerator.
Adding a limestone desulfurization device into the front-end incinerator: the bottom of the limestone storage bin 1 is connected with the top end of a first conveying bin pump 3, the discharge port at the lower part of the first conveying bin pump 3 is connected with the top end of a lime buffering storage bin 4, the bottom end of the limestone storage bin 4 is connected with the top end of a second conveying bin pump 5, the discharge port at the lower part of the second conveying bin pump 5 is connected with a limestone blowing device 6 on the upper part of one side of the incinerator 7, a compressed air pipeline is connected with the first conveying bin pump 3, and a limestone conveying pipeline is connected with the limestone storage bin 1.
Rear-end sodium bicarbonate desulfurization unit: the baking soda feeding device 10 is fixedly installed in the space right above the baking soda storage bin 12, the bottom of the baking soda storage bin 12 is sequentially connected with a gate valve 14 and a discharging rotary valve 15, the other end of the discharging rotary valve 15 is connected with a feeding hole at one end of a spiral conveyor 16, a discharging hole at the other end of the spiral conveyor 16 is connected with a feeding hole at one end of a grading grinding machine 17, the side of the feeding hole at one end of the grading grinding machine 17 is sequentially connected with a baking soda conveying fan 19 and an air filter 18, a discharging hole at the other end of the grading grinding machine 17 is connected with a baking soda blowing device 21 at the lower part of one side of a baking soda reaction tower 20, a bag-type dust collector is connected to the upper part of one side of the baking soda reaction tower 20, and the bottom end of the baking soda reaction tower 20 is connected with an electrostatic dust collector 9 through a flue gas pipeline.
The baking soda reaction tower 20 is provided with a return opening 22 of fly ash of a bag-type dust remover.
The other end of the electrostatic dust collector 9 is connected with the waste heat boiler 8 through a flue gas pipeline, and the other end of the waste heat boiler 8 is connected with the incinerator 7 through a flue gas pipeline.
The top of the limestone storage bin 1 is provided with a bin top bag-type dust collector 2, and the top of the baking soda storage bin 12 is provided with a bin top bag-type dust collector 13, so that the field environment is friendly.
Limestone is conveyed by a bin pump, and a return pipeline returning to the limestone storage bin from the bin pump is arranged, so that the sealing and leakage-free limestone conveying process is ensured.
The raw material sodium bicarbonate is subjected to superfine grinding by a grading grinder 17 to make the final particle size reach D90Less than 20-35 μm to ensure the high-efficiency reaction of the sodium bicarbonate and the acidic components in the flue gas to SO2The removal efficiency of (2) is more than 95 percent, and the removal efficiency of (2) to SO3And the HCl removal efficiency is above 98%.
The baking soda and the flue gas are fully mixed in the baking soda reaction tower 20, and the reaction time is ensured to be more than 2 s.
The baking soda conveying device and the baking soda conveying steps adopt a negative pressure conveying mode, a sealing device for preventing the baking soda from leaking is not needed, the complexity of the system is reduced, the conveying distance is longer, meanwhile, the temperature inside the grading grinder 17 is relatively lower, and the hardening of the baking soda inside the grading grinder 17 is reduced.
The baking soda reaction tower 20 is provided with a return opening 22 of the fly ash of the bag-type dust remover, so that the fly ash returns to the tower, and the contact and reaction effect of the baking soda and the flue gas are further ensured.
Example 2: as shown in fig. 1, a two-stage dry deacidification method for sludge incineration flue gas comprises the following steps:
step 1), conveying limestone powder in the limestone storage bin 1 to a lime buffering bin 4 by a limestone first conveying bin pump 3.
And 2) spraying limestone powder in the lime buffer bin 4 into an incinerator 7 through a second conveying bin pump 5 by a limestone spraying device 6, and neutralizing acid gas in flue gas in the sludge incineration process to realize the first stage of two-stage dry desulfurization.
Step 3), charging baking soda into a baking soda storage bin 12 through a baking soda charging device 10.
Step 4), the baking soda in the baking soda storage bin 12 is conveyed to a baking soda grading grinder 17 by a screw conveyer 16 through a gate valve 14 and a discharge rotary valve 15.
Step 5), the air passes through an air filter 18 and then is conveyed to a baking soda reaction tower 20 by a conveying fan 19 after being ground.
And step 6), the baking soda powder is sprayed into the baking soda reaction tower through a baking soda injection device 21 and is fully mixed with the flue gas which comes out of the incinerator 7 and sequentially passes through the waste heat boiler 8 and the electrostatic dust collector 9, so that the second stage of double-stage dry desulfurization is realized.
And 7), feeding the incineration flue gas desulfurized by the baking soda reaction tower 20 into downstream equipment (a bag-type dust remover).
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A double-stage dry deacidification complete device for sludge incineration flue gas is characterized in that the bottom end of a limestone storage bin is connected with the top end of a first conveying bin pump, the lower discharge port of the first conveying bin pump is connected with the top end of a lime buffering bin, the bottom end of the limestone storage bin is connected with the top end of a second conveying bin pump, the lower discharge port of the second conveying bin pump is connected with a limestone blowing device on the upper part of one side of an incinerator, a compressed air pipeline is connected with the first conveying bin pump, a limestone conveying pipeline is connected with the limestone storage bin, a baking soda feeding device is fixedly installed in a space right above the baking soda storage bin, the bottom of the baking soda storage bin is sequentially connected with a gate valve and a discharge rotary valve, the other end of the discharge rotary valve is connected with a feed inlet at one end of a spiral conveyor, a discharge port at the other end of the spiral conveyor is connected with a feed inlet at one end of a grading grinder, and the side of the feed inlet at one end of the grading grinder is sequentially connected with a baking soda conveying fan and an air filter, the discharge port at the other end of the grading grinder is connected with a baking soda blowing device at the lower part of one side of the baking soda reaction tower, the upper part of one side of the baking soda reaction tower is connected with a bag-type dust remover, and the bottom end of the baking soda reaction tower is connected with an electrostatic dust remover through a flue gas pipeline.
2. The two-stage dry deacidification plant for sludge incineration flue gas according to claim 1, characterized in that the baking soda reaction tower is provided with a return port for fly ash of a bag-type dust remover.
3. The two-stage dry deacidification complete plant for sludge incineration flue gas as claimed in claim 1, wherein the other end of the electrostatic precipitator is connected with the waste heat boiler through a flue gas pipeline, and the other end of the waste heat boiler is connected with the incinerator through a flue gas pipeline.
4. The two-stage dry deacidification plant for sludge incineration flue gas as claimed in claim 1, wherein a top bin bag dust remover is arranged at the top of the limestone storage bin, and a top bin bag dust remover is arranged at the top of the baking soda storage bin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022928278.9U CN214287557U (en) | 2020-12-09 | 2020-12-09 | A doublestage dry process deacidification integrated equipment for sludge incineration flue gas |
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| CN202022928278.9U CN214287557U (en) | 2020-12-09 | 2020-12-09 | A doublestage dry process deacidification integrated equipment for sludge incineration flue gas |
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