TW508264B - Discharge and regeneration system for cogeneration desulfurization device with zero discharge - Google Patents

Abstract

The present invention relates to a discharge and regeneration system for a cogeneration desulfurization device with zero discharge, which uses a wet magnesium hydroxide desulfurization device to process the fuel gas generated from the fuel coal/fuel oil used by a boiler of a steam/electricity cogeneration device to discharge waste water containing magnesium sulfate; the waste water is further treated to obtain a solution of magnesium hydroxide and calcium sulfate that is recyclable without secondary contamination; the invented system mainly comprises a storage tank of magnesium oxide, a pyrolysis tank of magnesium oxide, a storage tank of magnesium hydroxide, an absorption tower, an oxidation tank, a mixing pond of bottom ash, a storage tank of calcium chloride, a reaction tank, a storage tank of calcium hydroxide, a mixing tank of calcium oxide, a storage tank of calcium oxide, a buffer barrel of magnesium hydroxide, a first precipitation tank, a second precipitation tank, and a boiler water seal; the abovementioned devices are connected through a specific loop such that a waste water containing magnesium sulfate can be processed into magnesium hydroxide and calcium sulfate; in particular, the system is installed into an ""automatic intra-system circulation without discharging waste water"" during the processing, thereby forming an independent operation system having an excellent application value.

Description

508264 V. Description of the invention (1) 7¾ # = January is a zero discharge and regeneration recovery system of eight electric desulfurization equipment. @ 二 4 kinds of unique processing procedures, so that the gas produced by the cogeneration of gas and electricity symbiosis equipment is 5 π ^ Wastewater that generates 3 & I money can be effectively processed again. Η η liquid and sulfuric acid words, and the operation of the overall system is a good production chapter = no problem of wastewater discharge (zero discharge) in S To achieve the industrial utilization value and practical effect of u. Traditional methods and disadvantages

However, drying can be converted into the source of steam. Therefore, the burned type can be used to filter or exhaust the exhaust gas, or to filter. | "Methods, both gas and electricity are used." There will be dyed treatment in the process of collecting waste gas for collection of "wet waste gas method is the method of) Drying the pollution naturally has the following, which is based on fuel heat requirements' and The steam produced by the steam oven is a problem. However, the traditional "dry" set). Of course, there are also three types of mud such as filtered water, such as "water-soluble" or "thirsty-thirsty" treatment words; the above-mentioned "drying pond", which requires great amounts, does not match the size of the soil. ’And a huge field is needed,

(Page 6) ⑽ 264 ⑽ ⑽ 264 V. Description of the invention (2) (2) Heating and steaming (3) Filter material wastes heat source, and the steam of the steaming process product has no "sulphur content," It is the cause of "acid rain": soot) ", environmental pollution. The element is also a type that also needs to be equipped with filter press equipment, & filter material (regular replacement), = 2, and it will be blocked if it is consumed, and it needs to be far away regularly. And 'would have the problem of waste water discharge: it is extremely inconvenient to outline the technology and purpose of the present invention. The present invention is to provide a previously-available & process method system that saves space, resources, and processes. Its main technology and purpose are: one of excellent separation, speed, and true separation. It has a unique circuit connected oxidation ^ ^ fr γμ λμ ^ η MG 7 ^, magnesium oxide pyrolysis tank, = Syria: tank , Absorption tower, oxidation tank, bottom tank, reaction tank, hydroxide storage tank: dagger storage tank, first sedimentation tank, second Shendian tank, with furnace water seal to separate wastewater into magnesium hydroxide solution and Calcium sulfate by-products have the effect of preventing secondary pollution from discharged wastewater. Second, the overall system operation, i automatically circulates, there will be no disturbance of wastewater discharge. Ya'a can save the space and deal with the situation quickly, so that the wastewater treatment of the steam and electricity co-generation equipment can achieve excellent environmental protection effect. In order to allow the Bureau ’s review members and those skilled in this art to

Page 7 508264

The effect is fully understood, and the structure, process, function and effect of the present invention are described in detail with the illustrations and numbers of the embodiments. The following is an illustration of the first embodiment, which includes a magnesium oxide storage tank. Magnesium oxide (MgO) pyrolysis tank 11, hafnium oxide (Mg (〇H) 2) storage tank 12, 1 collection tower 13, oxidation tank 14, bottom ash mixing tank 15, calcium chloride (CaC12) tank 1, 6, First sedimentation tank 24, boiler water seal 丨 8, reaction tank 丨 9, oxidation: storage tank 20, calcium oxide (CaO) stirring tank 21, calcium oxyhydrogen storage tank "," magnesium oxide buffer tank 23, second The sedimentation tank 17 is formed; the method of the system is described as follows: 、 oxidized oxide storage tank 10: storage of dysprosium oxide (Mg 〇) solution tank 1 1; and communicates with the magnesium oxide heat

Magnesium oxide pyrolysis tank 1 1 Mix, and in the process of steaming, milking mud, and re-magnesium storage tank, add the received magnesium oxide powder to the water and mix it. Add a small amount of hot water to pyrolyze the tritium oxide into hydroxide. Magnesium is pumped to the oxygen and hydrogen 12 by the pump MP; the magnesium hydroxide storage tank 1 2 stores the mash of mash and continues to be blended, and

Equipped with a pumping pump from Lipu to the absorption 1 卩 · absorption tower 1 3: It has the function of flue gas desulfurization, and the flow of the flue gas flows from the bottom to the top of the absorption tower. The sulfur oxides in the flue gas are suspended in a homogeneous state of 130, which can remove the% of the circulating fluid in the flue gas after desulfurization. Magnesium hydroxide is required to be added, and the corpse pump MP is fed and absorbed. Sulfuric acid

Page 8 508264

The sulphuric acid or thorium sulfite waste liquid is pumped to the oxidation tank 14 for further treatment; the oxidation tank 14 has a stirring function, which can increase aeration and oxidation, and oxidize the residual magnesium sulfite (MgS03). Magnesium sulfate aqueous solution; 'Calcium chloride storage tank 16: stores calcium chloride CaC12, and is equipped with a wheel pump to communicate with bottom ash mixing tank 15; bottom ash mixing tank 15 · with stirring function, withstand oxidation tank 丨3 of 4 to 5% sulfur

Magnesium acid MgS04 solution, and calcium chloride added to the calcium chloride storage tank 丨 6, and made it react chemically to produce gasified magnesium MgC 1 2 and then pumped to the first Shendian tank 2 4; It also withstands the second reaction tank 丨 7 upper reactant chlorination # 5 solution, steel furnace water seal 18 aqueous solution, and can be recycled to the magnesium chloride state and sent back to the second precipitation tank 17; calcium oxide storage tank 20 and Calcium oxide stirring tank 21: Add calcium oxide Ca0 to water,

It is mixed evenly to produce a calcium hydroxide Ca (0H) 2 emulsion, which is hydrolyzed, and is equipped with a rotary pump MP to transport to ^ calcium hydroxide storage tank 2 2; calcium hydroxide storage tank 22: Department of storage Calcium hydroxide, equipped with a pump Mp, is added to the reaction tank 19; reaction tank 19 · The second sedimentation tank 17 bears the upper layer containing magnesium chloride MgC1 2 water-soluble

Page 9 508264 V. Description of the invention (5) Liquid and calcium hydroxide solution of calcium hydroxide storage tank 22, mixed to produce calcium chloride CaCl 2 and magnesium hydroxide Mg (〇H) 2 solution The pumping system is pumped to the second sedimentation tank 17 for separation and reprocessing; the first sedimentation tank 24 is the aqueous solution that is subjected to the reaction tank 19 for sedimentation and separation of chlorination and chlorine oxidation aqueous solution. The upper layer is chlorine. The caustic solution is returned to the bottom ash and the pool 15 is reacted, and then sent to the second precipitation tank 17; the lower layer is the magnesium hydroxide aqueous solution, which is then transferred to the magnesium hydroxide buffer tank 23 and then transferred to the absorption tower 13; Magnesium buffer bucket 23: equipped with a transport pump MP to transport the reduced hydroxide aqueous solution to the absorption tower for 1 to 3 circulating fluids, which are then desulfurized and absorbed, and the oxidation tank 1 4 and the bottom ash mixing tank 15 5 The second Shendian tank 17, the reaction tank 19, and the first sedimentation tank 24 are circulated. 苐 Second Shendian tank 17: It is a solution that bears the bottom ash mixing tank 15 to produce sedimentation, and the upper layer of magnesium chloride The MgC12 solution was introduced into the reaction tank 19 again for reaction, and the sinker in the lower layer was the clay-like form of calcium sulfate CaS04. Substance, that is, the water seal flowing to the surface furnace 18; Boiler water seal 18: It has a conveyor belt 180, which bears the mud-like substance of the second sedimentation tank 丨 8, and can be strengthened to separate into water (H20), The sulfuric acid I bow C a S 0 4 stucco, the water is in the upper layer, and then overflows to the bottom ash mixing tank 15, and the calcium sulfate stucco of the mud,

Page 10

The above-mentioned structure is explained in detail as follows. The present invention is (a) the invention is repeated multiple times, and the absorption tower 13 is used to remove water. In the present invention, the bottom ash stirring tank 15 (magnesium chloride) is first settled), and then, the role of Huadian (containing oxidation 2 2) is transferred to the hydroxide, chloride dancer bowl 17, and then, the magnesium hydroxide furnace is separated. Water seal 18 (2) Zero waste water ^ skin conveyor belt 180 is conveyed to the bottom ash storage tank, #recycling, recycling and loop system, the function and effect of the present invention, and it has the following unique functions and effects ... Substances in wastewater 'recovery of magnesium hydroxide solution: = Discharged 0, which is "only" absorption and the upper layer is equipped with a mist eliminator 130, so that the flue gas flow passes through the mist eliminator, so the emitted smoke must meet environmental protection standards.

It is treated in a "continuous cycle", which is: through the oxidation tank 14, and the first: the sedimentation tank 17 'to allow the bottom of the mud-like ⑯ (sulfur is settled by the boiler water seal 18 to exclude (that is, it is not easy to make the first ox cart 乂 Shen Dianzhi The aqueous solution is then passed through the reaction tank ^ 9, about storage tank 20, oxidation sample "Cao 21", the hydroxide is passed through the first precipitation tank 24, and then separated into the magnesium hydroxide town buffer bucket 2 3 and the recycling wheel is added to the absorption tower丨 3 Recycling and transporting to bottom ash mixing tank 丨 5, and then ^ to the ^ = and again the above-mentioned cycle action, so again and again = and calcium chloride aqueous solution recovery and reuse, and the sludge by ^ belt 1 80 is transported to the bottom ash storage tank for reuse. 1

Discharge: #The present invention can be described as "zero emissions", because: only above the absorption tower 丨 3 ^ ^ air strips, and this water vapor is clean water, and the conveyor belt 180 is sealed by the pot water 18 The mud is conveyed out, and then recycled (this is not the subject of the safety application, please do not overload), so there is no large amount of waste gas and waste water.

508264 The problem system can be used in a small site, and there is no problem that waste water is discharged to the outside. ^ Invention of reducing magnesium sulfate contained in waste water to magnesium hydroxide, and then showing "water H20" and "calcium sulfate CaS04" "" Magnesium chloride MgC; l2 "", the chemical reaction of the recovery is: "Regeneration and recovery", "The wastewater itself contains sulfide, and in the oxidation tank 14 and the bottom ash mixing tank 15, there are 3 ~ 5 % Magnesium sulfate MgS04, and agitated aeration to enhance oxidation, so the following reactions will occur: The main reaction of magnesium hydroxide absorption S02 is as follows:

Mg (0H) 2 + S02- > MgS03 + 2H20

MgS03 + S02 + H20- > Mg (HS03) 2 Generally, the flue gas contains 3 ~ 8% 〇2. MgS03 and Mg (HS03) 2 in the absorption liquid are oxidized by natural oxidation (or oxidized by forced aeration). Or most of them are oxidized to MgS04, the reaction formula is as follows:

MgS03 + l / 2 02 + 7H20—MgS04 · 7H20 Mg (HS03) 2 +02 + 7H20- ^ MgS04 · 7H20 + H2S04

2. Also, because calcium oxide CaO passes through the water and stirring (hydrolysis) of the calcium oxide stirring tank 21, calcium hydroxide Ca (0H) 2 emulsion is produced, that is, calcium hydroxide is added, so there will be The following reactions: MgS04 + Ca (0H) 2 + 2H20- > Mg (OH) 2 + CaS04 · 2H20 MgC12 + Ca (0H) 2— > Mg (0H) 2 + CaC12 H2S04 + Ca (0H) 2— CaS04 · 2H20 MgS04 + CaC 1 2 + 2H20—MgC12 + CaS04 · 2H20

wi

Page 12 508264 V. Description of the invention (8) That is, “there will be the“ interaction ”mentioned above, so magnesium hydroxide Mg (0H) 2 can be regenerated and recovered, and vice-versa will produce stone lean (CaS04. 2H2〇). product. (4) Reasonable: The stucco and waste water containing chemical substances from the month of irrigation has the effect of cultivating waste water, which has the effect of saving resources ^ / to zero and environmental protection. In the above, the cost of cancer, labor, and artificial intelligence. In summary, the system of the present invention achieves what has been achieved from the "field, which is indeed an unprecedented house"; "steam-electricity symbiosis equipment". Efficacy is also granted a quasi-patent, which is a real virtue. 'It is in line with the gist of the invention patent, and I kindly ask for a simple explanation of the figure: Figure 1 is a drawing showing the system flow chart of the present invention: $ @ 10Magnesium oxide storage tank 11 Magnesium oxide pyrolysis tank 12 Magnesium hydroxide storage tank 13 Absorption tower 1 3 0 mist eliminator 14 oxidation tank 1 5 bottom ash transfer tank 1 6 chlorination dump tank 17 second sedimentation tank 1 8 chain; furnace water seal 180 conveyor belt 19 reaction tank 20 calcium oxide storage tank 21 calcium oxide stirring tank 2 2 Hydroxide | Bow storage tank 2 3 Magnesium hydroxide buffer bucket 24 First MP precipitation pump

Claims (1)

508264 Six types of patent applications $ Zero emission and regeneration recovery system for steam and electric desulfurization equipment, including storage tank, oxidation lock (Mg〇) pyrolysis tank, hydroxide lock (〇H) 2 =, absorption tower, oxidation Tanks, bottom ash mixing tanks, chlorinated chlorite-sedimentation tanks, boiler water seals, reaction tanks, calcium hydroxide storage tanks, CaO mixing tanks, oxidation word storage tanks, magnesium hydroxide buffer barrels, and oxygen : Composed of a dagger tank; "The method of arranging and processing the system is as follows: •, and t. The deposit of emulsified magnesium (Mg〇), and connected to the magnesium oxide pyrolysis tank; the magnesium oxide pyrolysis tank: the accepted Magnesium oxide powder is mixed with money, and a small amount of hot water or steam is added in the process of f, so that the emulsified magnesium in the nitrogen oxidation tank is pyrolyzed into magnesium hydroxide emulsion, and then pumped to the magnesium hydroxide through a pump. Storage tank; store milk mud and continue to stir, and mix with absorption tower stone and W 迗 pump for filling to absorption; it has flue gas desulfurization function, and the flue gas stream is sprayed from ^ to the upper part of the collection tower Contact with the circulating absorbent solution of the shower == 'To absorb sulfur oxides in the flue gas 3J Nitrogen oxidizing town: pass; the reactant after the absorption reaction in the oxidation tank is magnesium sulfate or acid, and pumped to the oxidation tank for treatment; · Magnesium waste liquid, with stirring function, can improve aeration, Selecting the line of magnesium sulfite (Ca oxidation: water-soluble 508264 / ,, claim Qing patent scope chloride storage tank · store calcium chloride CaC12, and equipped with a delivery pump connected to the bottom ash mixing tank; bottom ash Delivering tank: with stirring function, it can withstand the 3 ~ 5% magnesium sulfate MgS04 solution in the oxidation tank, and withstand the chlorination added by the calcium chloride storage tank to make it react chemically to produce magnesium chloride MgCl 2 and then be pumped It is sent to the first precipitation tank; it also bears the calcium chloride solution of the upper reactant of the second precipitation tank, and the water solution of the boiler water seal, so that it can be recycled to the state of magnesium chloride and sent back to the second precipitation tank. Oxidation reduction storage tank and calcium oxide stirring tank: the calcium oxide Ca0 is added with water and stirred uniformly to generate a hydrolytic reaction to form hydroxide _ milk sludge, and then equipped with a transport pump to transport ^ to the calcium hydroxide storage tank; wind Calcium oxide storage tank: Department of storage Calcium oxide is added to the reaction tank with a transport pump. Reaction tank: The upper layer of the second sedimentation tank contains the MgC 12 aqueous solution of magnesium chloride and the calcium hydroxide solution of the calcium oxychloride storage tank, which is mixed to produce chloride. The solution of calcium CaC12 and magnesium hydroxide Mg (0H) 2 is pumped to the second sedimentation tank for separation and reprocessing. The first sedimentation tank is an aqueous solution that bears the reaction tank and is used for calcium chloride and magnesium hydroxide. The sedimentation and separation of the aqueous solution, the upper layer is calcium chloride, and the liquid flows back to the bottom ash stirring tank for reaction, and then is sent to the second precipitation tank, and the lower layer is the magnesium hydroxide aqueous solution, which is sent to the magnesium hydroxide. The magnesium hydroxide buffered Γ bucket is then transported to the absorption tower; equipped with a transport pump to dissolve the reduced magnesium hydroxide water overnight, transported and added to the absorption tower circulating liquid, and then desorbed by the furnace, and oxidized tank, bottom ash mixing tank Second, second and seventh sedimentation tanks, 牝 reaction tanks, the first sedimentation tank cycle treatment; π steel furnace water seal It bears the solution of the bottom ash agitated tank and produces a precipitation effect, and the upper magnesium chloride MgC 12 solution is introduced into the reaction tank to react again. The lower layer of the sanitary matter, namely the calcium sulfate CaS04 mud-like substance, flows to the boiler water seal; With 'it accepts the mud-like substance of the second sedimentation tank, and can be strengthened to separate water (112〇), calcium sulfate CaS04 stucco' water appears in the upper layer, and then overflows to the bottom ash mixing tank, and the mud The calcium sulfate stucco of the object is transported to the bottom ash ^ storage tank by a conveyor belt, and then recycled; from the trace system, the wastewater generated by the steam-electricity co-desulfurization equipment can be repeatedly circulated. The treatment is clean. The flue gas emission and wind magnesium oxide can be recycled to achieve the practical effect of zero wastewater discharge. Page 16