CN1221865A

CN1221865A - Chimney with dusting, desulfurizing and denitrating functions

Info

Publication number: CN1221865A
Application number: CN 97126344
Authority: CN
Inventors: 苏文贤
Original assignee: Taidian Pollution Prevention & Treatment Co Ltd
Current assignee: Taidian Pollution Prevention & Treatment Co Ltd
Priority date: 1997-12-30
Filing date: 1997-12-30
Publication date: 1999-07-07
Anticipated expiration: 2017-12-30
Also published as: CN1087068C

Abstract

A chimney with dusting, desulfurizing and denitrating functions has a reaction tower arranged at lower part of the chimney body. In the reaction tower there is at least on partition to divide it into several rooms. Each room has sprayer set. Different storage pools can provide stronger oxidant and slightly alkaline diluent, which is sprayed out by sprayer to adhere and capture fine dust particles while to chemically react on harmful gas. All the rooms have own drains. The drained water is filtered by filter, cooled by cooling water tower and flows finally into a reservoir for reuse.

Description

Chimney with dust removal, desulfurization and denitrification functions

The invention relates to a chimney, in particular to a chimney with the functions of dust removal, desulfurization and denitrification.

With the advancement of technology, many pollutants, no matter air or water, frequently produced in industrial production process have attracted much attention to the problem of environmental pollution, as shown in FIG. 1, the invention patent publication No. 085097 of Taiwan application of the present applicant is a chimney exhaust gas dedusting method and apparatus (add-on) for reducing the pollution of exhaust gas discharged from chimney, mainly comprising a passage 31 ' between a boiler 10 ' and a chimney 20 ' installed perpendicular to the boiler 10 ' for the exhaust gas to enter a filtering apparatus 30 ' installed beside the boiler 10 ' and the chimney 20 ', at least one set of sprayer assemblies 60 ', 70 ' and a pipe 35 ' connected to the chimney 20 ', the sprayer assemblies 60 ', 70 ' spraya fine alkaline water mist net containing sodium hydroxide (NaOH) through a mixer 40, so as to adhere and capture the fine dust particles contained in the exhaust gas flowing through the filtering device 30', and utilize NaOH and harmful gas,such as sulfur dioxide (SO)₂) Or sulfur trioxide (SO)₃) And the solid compounds are formed by chemical reaction and are condensed to the discharge ports 34 ' and 22 ' arranged at the bottom of the filter device 30 ' and the chimney 20 ' and flow to the sedimentation tank 50 ', so as to achieve the effects of dust removal and desulfurization. However, the NaOH dilution contained in the mixer 40 'of the chimney flue gas dust removal apparatus cannot achieve the purpose of denitration, and the wastewater flowing into the sedimentation tank 50' through condensation cannot be effectively treated.

The object of the present invention is to provide a chimney with dust-removing, desulfurization and denitrification functions, which can achieve the purposes of dust-removing, desulfurization and denitrification.

The invention relates to a chimney with functions of dust removal, desulfurization and denitration, which is characterized in that a reaction tower is arranged at the lower section of a chimney body, an air inlet hole for the waste gas generated by a combustion mechanism to enter is arranged at the lower position of the reaction tower, in addition, a plurality of sprayer groups are arranged in the reaction tower, and at least one demister is arranged at the uppermost part of the sprayer groups, and the invention is characterized in that: at least one partition board is transversely and obliquely arranged at a proper height in the reaction tower to divide the reaction tower into at least an upper part and a lower part, the lower half part is a first accommodating chamber, the upper half part is a second accommodating chamber, a plurality of groups of sprayer groups are respectively arranged in the first accommodating chamber and the second accommodating chamber, the sprayer groups in the first accommodating chamber are communicated with a first storage tank, diluent containing strong oxidant provided by the first storage tank is sprayed out of a water mist net layer through the sprayer groups, so that the superfine dust particles flowing through the first accommodating chamber can be captured in an adhering way, and harmful gas containing Nitric Oxide (NO) is oxidized into two parts by generating a chemical reaction modeNitric Oxide (NO)₂) In addition, the bottom of the first chamber is provided with a first drainage port for condensed waste water to flow to a first sedimentation tank, the sprayer group of the second chamber is communicated with a second storage tank, a demister is arranged above the sprayer, and the second storage tank is used for providing diluted solution containing micro-alkali to be sprayed out of a water mist net layer through the sprayer group, so that the diluted solution containing micro-alkali can be adhered, captured and fleed for one timeThe fine dust particles flowing to the second chamber can generate chemical reaction to generate harmful gas such as Sulfur Oxide (SO)_X) Nitrogen Oxide (NO)_X) And the separation plate is provided with a through hole in the center of the plate and a hollow support cylinder extending upwards, and a conical protection plate is arranged above the support cylinder to provide gas circulation and prevent the condensed wastewater in the second accommodating chamber from flowing back to the first accommodating chamber.

The invention is described in detail below with reference to the following figures and examples:

fig. 1 is a combined sectional view of taiwan patent publication No. 085097.

FIG. 2 is a flow chart illustrating a preferred embodiment of the present invention.

FIG. 3 is a schematic view of a reaction column according to a preferred embodiment of the present invention.

As shown in fig. 2 and 3, the chimney with dust removing, desulfurization and denitration functions of the present invention is provided with a reaction tower 20 at the lower section of a chimney body 10, an air inlet 21 is provided at the lower position of the reaction tower 20 for the waste gas generated by a combustion mechanism (not shown) to enter, the combustion mechanism can be a generator, a boiler, an incinerator, a coal heating furnace, a metal furnace, etc., in addition, a plurality of sprayer groups 22 are provided in the reaction tower 20, a water mist net layer containing diluent is continuously sprayed out by the sprayer groups 22, so as to adhere and capture the tiny dust in the waste gas, and generate a chemical reaction with harmful gas, and the tiny dust is condensed and increased in weight to be discharged, and at least one demister 23 is provided at the uppermost of the sprayer groups 22, the demister 23 can resist high temperature, and can obtain excellent condensation effect, because the prior art is the same, and will not be described in detail.

The invention also discloses a chimney with the functions of dust removal, desulfurization and denitrification, wherein the smokeThe chimney further comprises at least one partition plate 30, the partition plate 30 is transversely and obliquely arranged at a proper height in the reaction tower 20, the reaction tower 20 is divided into an upper part and a lower part, the lower part is a first chamber 24, the upper part is a second chamber 25, a plurality of sprayer sets 22 are respectively arranged in the first chamber 24 and the second chamber 25, in addition, an inclined bottom 26 is arranged at the bottom end of the reaction tower 20, the sprayer sets 22 of the first chamber 24 are communicated with a first storage tank 40, a diluent containing a strong oxidant is provided by the first storage tank 40 and sprays out a water fog net layer through the sprayer sets 22, so that not only can fine dust particles be adhered and captured, but also harmful gas containing Nitric Oxide (NO) can be oxidized into nitrogen dioxide (NO) by means of generating a chemical reaction₂) In addition, in the secondA first drain opening 241 is provided at the bottom end of the first chamber 24 for condensed waste water to flow to a first sedimentation tank 50, the sprayer group 22 of the second chamber 25 is communicated with a second storage tank 60, the demister 23 is provided at the top of the sprayer group 22, a soft water sprayer 27 is provided above the demister 23 for enhancing the filtration of dust, and a diluent containing micro base is provided by the second storage tank 60 and sprayed out of a water spray net layer through the sprayer group 22 to adhere and capture fine dust particles which flow to the second chamber 25, and harmful gases such as Sulfur Oxides (SO) can be generated by a chemical reaction_X) Nitrogen oxide NO_XAnd the like, which chemically react with the diluted solution of the weak base to achieve the effect of simultaneous desulfurization and denitrification, in addition, a second drain opening 251 is arranged at the bottommost end of the second accommodating chamber 25 to allow the condensed wastewater to flow to a second sedimentation tank 70, a through hole 31 is arranged in the center of the partition plate 30 and a through support cylinder 32 extends upwards, and a conical guard plate 33 extends above the support cylinder 32 to provide gas circulation and prevent the condensed wastewater in the second accommodating chamber 25 from flowing back to the first accommodating chamber 24.

The advantages of the chimney with the functions of dust removal, desulfurization and denitrification are described in the following

Spraying a diluent containing a strong oxidant into the first chamber 24, wherein the diluent isThe strong oxidant can be sodium chlorite (NaClO)₂) Potassium permanganate (KMnO)₄) Or hydrogen peroxide (H)₂O₂) The diluent is automatically adjusted by a pH sensor 41 in the first storage tank 40 through a solvent in a strong oxidant storage tank 80 and the waste water recovered by filtration and the supplemented soft water, and compressed air is sprayed through a compressed air pipe 300 provided at the bottom of the tank, so that the diluent can be dissolved in water to form a uniform diluent. In addition, the alkaline solution sprayed in the second chamber 25 can be sodium hydroxide (NaOH), calcium hydroxide (Ca (OH)₂) Or magnesium hydroxide (Mg (OH)₂) The solvent in the alkaline solution storage tank 90 and the waste water recovered by filtration and the supplemented soft water are automatically adjusted by a pH sensor 61 in the second storage tank 60 and compressed air is sprayed through a compressed air pipe 300 provided at the bottom of the tank, so that the diluent can be dissolved in water to form a uniform diluent.

Therefore, when the combustion mechanism generates a gas having fine dust particles and harmful gases such as Sulfur Oxides (SO)_X) Nitrogen Oxide (NO)_X) When the waste gas enters the reaction furnace 20 through the gas inlet 21, the waste gas is firstly contacted with the dilute solution water mist mesh layer containing strong oxidant in the first chamber 24 to generate chemical oxidation action, so that the harmful gas containing Nitric Oxide (NO) is firstly oxidized into nitrogen dioxide (NO)₂) Can react with alkaline solution in the second chamber 25, in this embodiment, the strong oxidantis sodium chlorite (NaClO)₂) For example, the simple chemical equation is:

then, the oxidized gas (NO)₂) With Sulfur Oxides (SO)_X) The waste gas continues to flow upwards, and part of the sodium chlorite (NaClO)₂) Also rises with the gas, and is mixed with the aqueous mist of the diluent containing the alkali solution in the second chamber 25The mesh layers are contacted to generate a chemical reaction for achieving the effect of simultaneous desulfurization and denitrification, in this embodiment, the alkaline solution is sodium hydroxide (NaOH) for example, and the simple chemical equation is:

therefore, through the dual adhesion capture and dual condensation of the plurality of sprayer sets 22 and the demister 23, the dust and harmful gases in the exhaust gas can be reduced to achieve the effects of dust removal, desulfurization and denitration, and the experimental data shows that the dust removal efficiency of the present invention is more than 85%, the desulfurization efficiency is more than 95%, and the denitration efficiency is more than 74%, as shown in table 1, which is a comparison table applied before and after the use of the present invention in the Taiwan Taiwanese power plant in Penghu air pollution.

Table 1 table for comparing air pollutants before and after use in peng lake power plant of taiwan electric power company

The partition plate 30 divides the reaction tower 20 into two parts, the upper and lower parts, so that the sprayers 22 of the first chamber 24 and the second chamber 25 respectively spray a water mist net layer of the required diluent containing strong oxidant and the diluent containing alkaline solution, the fine dust is condensed and reacts with the harmful gas, and the diluted solution containing strong oxidant and liquid alkali is not mixed, thereby improving the efficiency of dust removal, desulfurization and denitration, the condensed wastewater respectively flows into the first sedimentation tank 50 and the second sedimentation tank 70 through the first drain opening 241 and the second drain opening 251 for filtration treatment, and processed by a corresponding filtering apparatus 100, and then respectively sent to a corresponding cooling water tower 200 for heat removal and recycling, and respectively sent to the first storage tank 40 and the second storage tank 60 and the solvent sodium chlorite (NaClO) provided by the strong oxidant storage tank 80 and the alkaline solution storage tank 90.₂) And sodium hydroxide (NaOH) are mixed to form a desired diluted solution, and the diluted solution is sprayed out through the sprayer group 22 to complete the effects of coagulating and recycling the waste water containing fine dust and chemical reactants, so that the waste water can be treated with less waste waterThe source, and the filter apparatus 100 in this embodiment is a plate and frame filter press. In addition, the diameter of the chimney body 10 is smaller than the diameter of the reaction tower 20, and is installed coaxially with the reaction tower 20, and the exhaust gas generated by the combustion mechanism is sucked upwards according to the natural smoke exhausting principle, so as to have the effect of raising the airflow well.

In summary, the chimney with functions of dust removal, desulfurization anddenitration according to the present invention is provided with a manual drain valve 51 and a manual drain valve 71 respectively at the bottom of the first sedimentation tank 50 and the bottom of the second sedimentation tank 70, because of some chemical reactants, such as sodium chloride (NaCl) and nitric acid (HNO)₃]And sodium sulfite (NaHSO)₃) When the water flows into the first and

second sedimentation tanks

50, 70, part of the water is discharged by the filter, the rest of the water is diluted with newly supplemented water and reused, and when the water is used for about three to four months, the water is discharged, so that the water discharge valves 51, 71 are respectively arranged at the bottoms of the first and

second sedimentation tanks

50, 70, and the discharged part is not filtered and recycled.

Claims

1. A chimney with functions of dust removal, desulfurization and denitration is provided, a reaction tower is arranged at the lower section of a chimney body, an air inlet hole for the waste gas generated by a combustion mechanism to enter is arranged below the reaction tower, a plurality of sprayer groups are arranged in the reaction tower, and at least one demister is arranged at the top of the sprayer groups, which is characterized in that:

the chimney also includes at least one partition board, the partition board is set in the reaction tower transversely and obliquely, and divides the reaction tower into at least two upper and lower halves, the lower half is a first chamber, the upper half is a second chamber, the first chamber and the second chamber are respectively provided with several sprayer sets, the sprayer set of the first chamber is respectively communicated with a first storage pool, the first storage pool provides diluent containing strong oxidant, the diluent is sprayed out by the sprayer setsto form water mist net layer, and the fine dust particles flowing through the first chamber are captured by adhesion, and harmful gas containing nitrogen monoxide is oxidized into nitrogen dioxide by means of chemical reaction, in addition, the bottom end of the first chamber is provided with a first drain outlet for condensed waste water to flow to a first sedimentation pool, the sprayer sets of the second chamber are respectively communicated with a second storage pool, the demister is arranged above the sprayer, the second storage tank provides diluent containing alkali liquor, the diluent is sprayed out of a water spray net layer through the sprayer group, fine dust particles which flow to the second accommodating chamber are adhered and captured, harmful gas and the slightly alkali diluent generate chemical action of desulfurization and denitrification in a chemical reaction mode, a second drainage opening for condensed wastewater to flow to a second sedimentation tank is arranged at the bottommost end of the second accommodating chamber, a through hole is formed in the center of the partition plate, a through support cylinder extends upwards, and a conical protection which provides gas circulation and can prevent the condensed wastewater in the second accommodating chamber from flowing back to the first accommodating chamber is arranged above the support cylinder.

2. The chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 1, wherein:

the chimney further includes a filtering device for filtering the waste water from the first and second sedimentation tanks, cooling water towers for receiving the water from the filtering device and removing heat, and returning the water to the first and second storage tanks, respectively, and a strong oxidant storage tank and an alkaline solution storage tank for providing a solvent to mix with the recovered water to form a desired dilution.

3. The chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 1, wherein:

the strong oxidant contained in the diluent of the first storage tank is sodium chlorite or potassium permanganate or hydrogen peroxide.

4. The chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 1, wherein: the alkaline solution contained in the diluent of the second storage tank is sodium hydroxide or calcium hydroxide or magnesium hydroxide.

5. The chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 1, wherein: a soft water sprayer capable of enhancing dust filtration is arranged above the demister in the second chamber.

6. The chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 1, wherein: the bottom end of the reaction column has an inclined bottom.

7. The chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 1, wherein:

8. the chimney with the functions of dust removal, desulfurization and denitration as claimed in claim 2, wherein: the filtration apparatus is a plate and frame filter press.