CN208049706U - A kind of dry method flue gas processing unit - Google Patents

Abstract

A kind of dry method flue gas processing unit, belongs to technical field of environment protection equipment.It is characterized in that：Including flue collector（9）, sodium bicarbonate grinding device（7）, powder warm-up block（6）And output deduster（39）, flue collector（9）Inlet end be used for pending flue gas input, flue collector（9）Outlet side with output deduster（39）Inlet end connection, sodium bicarbonate grinding device（7）Inlet end and flue collector（9）Inlet end connection, sodium bicarbonate grinding device（7）Outlet side and flue collector（9）Connection, powder warm-up block（6）It is arranged in sodium bicarbonate grinding device（7）And flue collector（9）Between.This dry method flue gas processing unit fully reacts sodium bicarbonate powder and flue gas, reduces the energy consumption of powder warm-up block, and desulfurization off sulfide effect is good, and can directly handle low-temperature flue gas.

Description

A kind of dry method flue gas processing unit

Technical field

A kind of dry method flue gas processing unit, belongs to technical field of environment protection equipment.

Background technology

Modern environment science warns us, and Atmosphere environment resource is not inexhaustible, as water resource and mineral provide Source is the same, it is the jointly owned wealth of the mankind, it is necessary to be protected from generation to generation, highly treasure and rationally utilize.Flue gas is gas It is the main reason for polluting residential block air with the mixture of flue dust.The ingredient of flue gas is very complicated, gas include water vapour, Sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbon and oxynitrides etc., flue dust include combustion Ash content, coal grain, oil droplet and high-temperature split product of material etc., therefore flue gas is to compound dirt that the pollution of environment is a variety of poisonous substances Dye.Three parts such as dedusting, desulphurization and denitration are generally comprised to the processing of flue gas at present, wherein desulfurization and denitration part is cigarette Most reluctant technique in gas disposal.

Flue gas desulfurization generally use alkali desulphurization, since the oxysulfide in flue gas is mainly sulfur dioxide and three oxidations Sulphur, therefore the sulfur dioxide and sulfur trioxide in flue gas are absorbed using alkali.The most commonly used is selectivity to urge at present for denitrating flue gas Change reduction denitration, selective non-catalytic reduction method denitration method and wet flue gas denitration technology.

Under the conditions of selective catalytic reduction SCR method denitrations are existing for catalyst, using ammonia, carbon monoxide or hydrocarbonization It closes object etc. and is used as reducing agent, the NO in flue gas is reduced to N in the presence of oxygen₂.SCR can be used as to react reducing agent Have ammonia, carbon monoxide, hydrogen, also methane, ethylene, propane, propylene etc..

SNCR is selective non-catalytic reduction, is a kind of inexpensive denitration technology of maturation.The technology is with burner hearth or water The predecomposition furnace of mud industry is reactor, and the reducing agent containing amino is sprayed into burner hearth, reducing agent and the nitrogen oxides in flue gas Reaction generates ammonia and water.In selective non-catalytic reduction method denitrating technique, urea or amino-compound are in higher reaction temperature Degree（930~1090 DEG C）Flue gas is injected, nitrogen oxides is reduced to nitrogen, the removal efficiency of the nitrogen oxides of SNCR techniques is main Stoichiometric ratio, mixability and reaction time etc. depending on reaction temperature, ammonia and nitrogen oxides, studies have shown that SNCR The temperature control of technique is most important.If temperature is too low, the reaction of ammonia is incomplete, be easy to cause ammonia leakage；And temperature mistake Height, ammonia are then oxidized easily the removal effect that ammonia is counteracted for nitrogen oxides.It is too high or too low for temperature all to cause to restore Agent loss and removal of nitrogen oxide rate decline.

Wet flue gas denitration is that the principle that nitrogen oxides dissolves is purified coal-fired flue-gas using liquid-absorbant.It is maximum Obstacle be nitric oxide be difficult to be dissolved in water, often require that and nitric oxide be oxidized to nitrogen dioxide first.It is general thus first Nitric oxide with oxidant, ozone, chlorine dioxide or potassium permanganate by reacting, and oxidation generates nitrogen dioxide, then nitrogen dioxide By water or alkaline solution absorption, denitrating flue gas is realized.

More or less all there is technical problem in above various denitration technologies, the chemistry arrived involved in above procedure first is anti- It answers, is required for reacting under conditions of high temperature, but reaction temperature is not achieved in the temperature of the flue gas of many Industrial Boilers, therefore lead It causes the denitration effect of above-mentioned technology poor, is unable to reach the environmental requirement of country.

Application No. is 201410094300.0 Chinese invention patent applications to disclose a kind of flue gas pollutant control one Change purification technique, flue gas and sodium bicarbonate powder is continuously introduced into circulating fluid bed reactor, flue gas makes sodium bicarbonate powder It at sulphided state and reacts, the preliminary sulfur and nitrogen oxides removed in flue gas；Then sprinkling sodium bicarbonate water is utilized The method of solution removes oxysulfide and other acidic oxide components in flue gas, using the solution containing sodium bicarbonate as suction It receives liquid and further removes the nitrogen oxides in flue gas, since with sodium bicarbonate chemistry does not occur for nitrogen oxides instead under usual state It answers, and does not refer to how making the nitrogen oxides in flue gas and reaction of sodium bicarbonate in this application file, and due to disclosed It is then sharp it can be seen that it is mainly to be aoxidized to nitrogen oxides using oxidant that it, which removes the nitrogen oxides in flue gas, in technique The nitrogen oxides after oxidation is absorbed with the alkalinity of sodium bicarbonate.Application No. is 201611252392.6 Chinese invention Shens Please a kind of waste incinerator two-part flue gas purification system, in disclosed technical solution, the alkali of sodium bicarbonate is still utilized Property removes the acidic components such as oxysulfide in flue gas, and nitrogen oxides is then that selective catalytic reduction device is utilized （SCR）It removes, needs flue-gas temperature at 200 DEG C or more, to reach reaction temperature.Application No. is 201621390495.4 Chinese utility model patent discloses a kind of device of the desulfurization and dedusting denitration for low-temperature flue gas, disclosed technical solution In, sodium bicarbonate is used merely to the oxysulfide in removing flue gas, and the removing of nitrogen oxides is also with SCR reactions The temperature of tower, flue gas need to be not less than 235 DEG C.In technical solution disclosed in above-mentioned file, removes nitrogen oxides in effluent and need to protect Demonstrate,prove flue gas temperature at 200 DEG C or more, have reached the removal effect of required nitrogen oxides, due to flue gas needed before denitration into Row desulfurization, the temperature of flue gas is generally difficult to be maintained at 200 DEG C or more after desulfurization, this results in denitrating flue gas effect poor, place The content of nitrogen oxides in effluent after reason is higher, cannot be satisfied national standard.

Invention content

The technical problems to be solved in the utility model is：Overcoming the deficiencies of the prior art and provide one kind can be fully utilized Sodium bicarbonate powder carries out desulphurization denitration to flue gas, can directly be handled low-temperature flue gas, the dry method cigarette of high treating effect Flash Gas Compression Skid System.

Technical solution adopted by the utility model to solve its technical problems is：The dry method flue gas processing unit, feature It is：Including flue collector, sodium bicarbonate grinding device, powder warm-up block and output deduster, the inlet end of flue collector is used It is connected to the inlet end of output deduster in the outlet side of the input of pending flue gas, flue collector, sodium bicarbonate grinding device Inlet end is connected to the inlet end of flue collector, and the outlet side of sodium bicarbonate grinding device is connected to flue collector, powder warm-up block It is arranged between sodium bicarbonate grinding device and flue collector.

Preferably, the inlet end of the flue collector is also connected with input deduster, input deduster outlet side and main cigarette The inlet end in road is connected, and the inlet end for inputting deduster is used for the input of pending flue gas.

Preferably, the inlet end of the flue collector is also associated with chimney meatus draught fan, the outlet side of chimney meatus draught fan and master The inlet end of flue is connected to, and the inlet end of chimney meatus draught fan is connected to by auxillary flue with the inlet end of sodium bicarbonate grinding device, The outlet side of chimney meatus draught fan is also connected to by drawing flue with the inlet end of sodium bicarbonate grinding device, draws flue and secondary cigarette Valve is both provided on road.

Preferably, the sodium bicarbonate grinding device includes feed bin, grinding machine and powder conveying pipe, and feed bin setting is being ground On the upside of machine, the inlet end of grinding machine is connected to the inlet end of flue collector, and the outlet side of grinding machine is connected by powder conveying pipe and flue collector It is logical.

Preferably, the inlet end of the grinding machine is also associated with grinding device air-introduced machine.

Preferably, it is provided with grader between the grinding machine and powder conveying pipe.

Preferably, the outlet side of the sodium bicarbonate grinding device is connected to by smoke backflow channel with flue collector, powder Body warm-up block is arranged on smoke backflow channel.

Preferably, the powder warm-up block includes powder heating tube, and powder heating tube is arranged in flue collector and carbonic acid Between hydrogen sodium grinding device, the both ends of powder heating tube are connected to the outlet side of flue collector and sodium bicarbonate grinding device respectively, It is provided with heating tape in powder heating tube.

Preferably, the powder warm-up block further includes input temp sensor and output temperature sensor, input The inlet end in powder heating tube is arranged in temperature sensor, and output temperature sensor is arranged in the outlet side of powder heating tube.

Compared with prior art, advantageous effect possessed by the utility model is：

1, the sodium bicarbonate grinding device of this dry method flue gas processing unit is ground sodium bicarbonate, and by that will lead Sodium bicarbonate when flue gas in flue is introduced into sodium bicarbonate grinding device to grinding preheats, and passes through the pre- hot-die of powder Block is slightly preheated and can be entered in flue collector, and sodium bicarbonate powder and flue gas is made fully to react, and reduces powder warm-up block Energy consumption, output deduster can remove unreacted sodium bicarbonate powder and flue dust, avoid being directly discharged in air to ring Border pollutes, and the energy consumption of this dry method flue gas processing unit is low, and desulfurization off sulfide effect is good, and can directly to low-temperature flue gas into Row processing.

2, input deduster can in advance be dusted the flue gas entered in flue collector, and the flue dust in flue gas is avoided to hamper Hinder sodium bicarbonate powder to be come into full contact with the flue gas in flue collector, ensure that the nitrogen oxides and oxysulfide in flue gas can fill Divide and react with sodium bicarbonate powder, desulfurization off sulfide effect is good.

3, draw on flue and auxillary flue and be both provided with valve, so as to as needed by flue gas by draw flue or Auxillary flue draw, so as to adjust extraction flue gas flow velocity, avoid counteracting the grinding of sodium bicarbonate, additionally it is possible to will Sodium bicarbonate after grinding is delivered in flue collector.

4, the flue gas drawn is passed through grinding machine, and sodium bicarbonate powder ground in grinding machine is conveyed by powder conveying pipe To flue collector, flue gas can either preheat the sodium bicarbonate powder after grinding, additionally it is possible to be carried using the moisture in flue gas The grinding efficiency of high carbon acid hydrogen sodium ensures the granularity of sodium bicarbonate powder after grinding between 10 μm ~ 40 μm, and then ensure that carbon Sour hydrogen sodium powder body comes into full contact with flue gas and fully reacts, and desulfurization off sulfide effect is good.

5, powder conveying pipe by grinding device air-introduced machine realize positive pressure conveying, due to sodium bicarbonate powder granularity compared with It is small, there is very strong adsorptivity, if using negative-pressure conveying system, material can be accumulated in adsorption precipitation on impeller, influence impeller Balance causes wind turbine vibrations that cannot work.

6, grader can detach sodium bicarbonate powder, and the powder for keeping granularity smaller enters powder conveying pipe Interior, the larger powder of granularity is re-introduced into grinding in grinding machine, to ensure the granularity of the sodium bicarbonate powder mixed with flue gas It is small, can more fully in flue gas nitrogen oxides and oxysulfide react.

7, sodium bicarbonate powder is preheated by powder heating tube, the temperature of sodium bicarbonate powder is made to maintain reaction Temperature, makes sodium bicarbonate powder fully be reacted with the sulfur and nitrogen oxides in flue gas by that is, 120 DEG C ~ 200 DEG C, and desulfurization is de- Nitre effect is good.

8, input temp sensor can detect the temperature for entering the flue gas in powder heating tube, if temperature reaches anti- Answer temperature, then the heating tape in powder heating tube does not work, if temperature is not up to reaction temperature, adding in powder heating tube Torrid zone work, while output temperature sensor works, and monitors heating temperature in real time, ensures that the temperature of sodium bicarbonate powder maintains Reaction temperature.

Description of the drawings

Fig. 1 is the structural schematic diagram of dry method flue gas processing unit.

Fig. 2 is the structural schematic diagram of dehumidification device.

Fig. 3 is the structural schematic diagram of sodium bicarbonate grinding device.

Fig. 4 is the scheme of installation of sodium bicarbonate grinding device.

Fig. 5 is the structural schematic diagram of powder warm-up block.

Fig. 6 is the structural schematic diagram of sodium bicarbonate grinding device in embodiment 2.

Fig. 7 is the partial enlarged view at A in Fig. 6.

In figure：1, boiler 2, input deduster 3, chimney meatus draught fan 4, extraction flue 5, auxillary flue 6, powder Warm-up block 7, sodium bicarbonate grinding device 8, chimney 9, flue collector 10, flue gas input channel 11, smoke backflow Channel 12, dehumidification device main body 13, heat exchanger 14, cooler 15, condenser 16, refrigeration compressor 17, Condensation fan 18, smoke volume damper 19, dehumidifying pipe 20, into cigarette volume damper 21, dehumidifying smoke-intake pipe 22, grinding chamber 23, sodium bicarbonate warehouse 24, electric block 25, ventilation opening 26, feed bin 27, grinding motor 28, Grinding machine 29, balance pipe 30, grinding device smoke-intake pipe 31, powder conveying pipe 32, grinding device air-introduced machine 33, classification Machine 34, grinding device pipe 35, powder preheating valve 36, powder heating tube 37, input temp sensor 38, Output temperature sensor 39, output deduster.

Specific implementation mode

Fig. 1 ~ 5 are the most preferred embodiments of the utility model, and 1 ~ 7 pair of the utility model is done furtherly below in conjunction with the accompanying drawings It is bright.

A kind of dry method flue gas processing unit, including flue collector 9, sodium bicarbonate grinding device 7, powder warm-up block 6 and Deduster 39 is exported, the inlet end of flue collector 9 is used for the input of pending flue gas, outlet side and the output deduster of flue collector 9 39 inlet end connection, the inlet end of sodium bicarbonate grinding device 7 are connected to the inlet end of flue collector 9, sodium bicarbonate grinding dress It sets 7 outlet side to be connected to flue collector 9, powder warm-up block 6 is arranged between sodium bicarbonate grinding device 7 and flue collector 9.This The sodium bicarbonate grinding device 7 of dry method flue gas processing unit is ground sodium bicarbonate, and by by the cigarette in flue collector 9 Sodium bicarbonate when gas is introduced into sodium bicarbonate grinding device 7 to grinding preheats, by powder warm-up block 6 slightly Preheating can make to enter in flue collector 9, and sodium bicarbonate powder and flue gas fully react, and reduce the energy of powder warm-up block Consumption, output deduster 39 can remove unreacted sodium bicarbonate powder and flue dust, avoid being directly discharged in air to environment It pollutes, the energy consumption of this dry method flue gas processing unit is low, and desulfurization off sulfide effect is good, and can directly be carried out to low-temperature flue gas Processing.

The utility model is described further with reference to specific embodiment, however persons familiar with the art should Solution, is to preferably explain here in connection with the detailed description that attached drawing provides, the structure of the utility model has necessarily had exceeded These embodiments of limit, and for some equivalents or common approach, it is no longer described in detail herein, but still fall within this The protection domain of application.

Embodiment 1

As shown in Figure 1：The dry method flue gas processing unit further includes input deduster 2, inputs the inlet end and pot of deduster 2 The outlet flue of stove 1 is connected to, and the flue gas of boiler 1, which is introduced into input deduster 2, to be entered back into after dedusting in flue collector 9, so as to Flue dust is enough avoided to influence the mixing of sodium bicarbonate powder and flue gas, additionally it is possible to flue dust be avoided to influence in sodium bicarbonate powder and flue gas Sulfur and nitrogen oxides reaction.It can be bag filter, electric precipitator or pipe precipitator etc. to input deduster 2.

The outlet side of input deduster 2 is connected to by flue gas input channel 10 with the inlet end of flue collector 9, and flue collector 9 is defeated Outlet is also connected with input deduster 2, and the input terminal of flue collector 9 is connected to the inlet end of output deduster 39, exports deduster 39 outlet side is connected with chimney 8, to by handle it is up to standard after flue gas be directly discharged by chimney 8.Flue gas inputs 10 He of flue It is provided with chimney meatus draught fan 3 between flue collector 9, influences the burning of boiler 1 slowly to avoid flow of flue gas excessively.In the present embodiment In, output deduster 39 is bag filter.

Be additionally provided between flue collector 9 and auxillary flue 5 and draw flue 4, draw inlet end and the flue collector 9 of flue 4 into Gas end is connected to, and the outlet side for drawing flue 4 is connected to the middle part of auxillary flue 5, is drawn and is provided with valve on flue 4, auxillary flue 5 Inlet end is also equipped with valve, so as to enter the velocity of flue gas in sodium bicarbonate grinding device 7 by valve regulated.

The inlet end of sodium bicarbonate grinding device 7 is connected to by auxillary flue 5 with flue gas input channel 10, sodium bicarbonate grinding The outlet side of device 7 is connected to by smoke backflow channel 11 with the middle part of flue collector 9, and the setting of powder warm-up block 6 is returned in flue gas On circulation road 11, dehumidification device is additionally provided on auxillary flue 5.Auxillary flue 5 can draw the flue gas in flue gas input channel 10 And be delivered in sodium bicarbonate grinding device 7, the grinding of sodium bicarbonate is assisted, and carried out to sodium bicarbonate powder after grinding pre- Heat keeps the energy consumption of powder warm-up block 6 few, and the preheating time of sodium bicarbonate powder is reduced, and dehumidification device can adjust pair Moisture in the flue gas that flue 5 is drawn, to improve the grinding efficiency of sodium bicarbonate, and makes sodium bicarbonate powder after grinding Granularity it is thinner.

When in use, multiple boilers 1 can share a sodium bicarbonate grinding device 7, defeated to this dry method flue gas processing unit Enter out deduster 2 and output deduster 39, so as to reduce fume treatment cost.The outlet side of each auxillary flue 5 is respectively provided with There is valve, so as to avoid entering in auxillary flue corresponding with the boiler 1 deactivated 5 in flue gas；Each smoke backflow channel It is both provided with valve on outlet side on 11, avoids flue gas from entering and is connected in smoke backflow channel 11 with the boiler 1 deactivated.

Flue gas inspection module is provided in flue gas input channel 10, flue gas inspection module can be flue gas on-line detecting system Or flue gas analyzer flue gas inspection module can monitor the content of nitrogen oxides in effluent and oxysulfide in real time, to make carbonic acid Hydrogen sodium grinding device 7 can adjust grinding and the conveying speed of sodium bicarbonate in time, realize closed-loop control, both avoid carbonic acid Hydrogen sodium powder body deficiency influences desulfurization off sulfide effect, and the conveying of sodium bicarbonate powder can be avoided excessive, improves fume treatment cost. The middle part and outlet side of auxillary flue 5 are both provided with temperature sensor, can monitor the temperature of flue gas in real time, avoid flue-gas temperature mistake Height causes sodium bicarbonate to decompose.The inlet end in smoke backflow channel 11 and outlet side are both provided with pressure sensor, can be real-time The pressure in smoke backflow channel 11 is monitored, ensures that sodium hydrogen carbonate powder body can be sprayed onto in flue collector 9 and is sufficiently mixed with flue gas, keeps away Exempting from insufficient pressure influences the mixing of sodium bicarbonate powder and flue gas.

The outlet side of flue collector 9 is provided with pressure signal, the pressure of flue gas can be monitored in real time, ensures that flue gas can be suitable Smooth warp is that output deduster 39 enters in chimney 8, avoids the burning for influencing boiler 1.

Preferably, the dry method flue gas processing unit can be handled the flue gas of chain-grate boiler.Due to chain-grate boiler Thermic load is extremely unstable, causes smoke evacuation also unstable, and the temperature range requirement of traditional denitrating technique, tradition side is not achieved in smoke temperature Method cannot be satisfied denitration requirement, and the dry method flue gas processing unit is used as soil release agent using sodium bicarbonate, in soil release agent and flue gas Sulfur and nitrogen oxides react, and the flue gas after reaction meets flue gas qualified discharge by output 39 dedusting of deduster Standard.

As shown in Figure 2：Dehumidification device include dehumidification device main body 12, heat exchanger 13, cooler 14, condenser 15 and Refrigeration compressor 16, dehumidification device main body 12 are rectangular box body, and the right side of dehumidification device main body 12 is provided with vertical installation The middle part of chamber, dehumidification device main body 12 is provided with horizontal partition board, to which 12 inner cavity of dehumidification device main body is divided into top Heat up the dehumidifying chamber of chamber and lower part, is provided with intercommunicating pore on the right side of partition board, and to will heat up chamber and the chamber that dehumidifies is connected to, heat up chamber Left end is connected with dehumidifying pipe 19, and the left end for the chamber that dehumidifies is connected with dehumidifying smoke-intake pipe 21, dehumidifying smoke-intake pipe 21 and auxillary flue 5 Outlet side is connected to, and dehumidifying pipe 19 is connected to the inlet end of sodium bicarbonate grinding device 7, is ground to make to enter sodium bicarbonate Flue gas moisture content in mill apparatus 7 is moderate, and proper temperature, avoids temperature is excessively high sodium bicarbonate is caused to decompose, additionally it is possible to Avoid the preheating of the too low grinding and sodium bicarbonate for influencing sodium bicarbonate of temperature.Condenser 15 and the setting of refrigeration compressor 16 are being pacified In behaveing affectedly, and condensation fan 17 is provided in the dehumidification device main body 12 on the upside of installation cavity, the setting of heat exchanger 13 is filled in dehumidifying The left side of main body 12 is set, the setting of cooler 14 is in dehumidifying intracavitary, and cooler 14 will dehumidifying chamber closing.Refrigeration compressor 16 is simultaneously It is connected with cooler 14 and condenser 15, to complete the conveying of refrigerant.

Preferably, the top setting of heat exchanger 13 in heating intracavitary and will heat up chamber closing, the lower part of heat exchanger 13 Setting dehumidifying intracavitary simultaneously closes dehumidifying chamber, and heat exchanger 13 is arranged under the left side of cooler 14, the left side of heat exchanger 13 It is connected on the left of portion and dehumidifying chamber, the lower right side of heat exchanger 13 is also connected to dehumidifying chamber, therefore enters the cigarette of dehumidifying intracavitary Gas enters by heat exchanger 13, being then discharged again by the lower part of 13 other side of heat exchanger, and hot flue gas can move up At the top of to heat exchanger, the low-temperature flue gas for the intracavitary that heats up can exchange heat with the high-temperature flue gas on 13 top of heat exchanger, to fill Divide the temperature that flue gas itself is utilized, reduces the consumption of heat.Flue gas is usually 100 DEG C, and relative humidity is 6% ~ 7%, flue gas By dehumidifying, smoke-intake pipe 21 enters dehumidifying intracavitary, and temperature is down to 44 DEG C or so after exchanging heat with 13 lower part of heat exchanger, so Flue gas temperature after subcooler 14 is down to 14 DEG C afterwards, and the vapor in flue gas condenses ponding at this time, and by 14 downside of cooler Water accumulating disc in, heating intracavitary is entered by intercommunicating pore through cooling flue gas, again with 13 top of heat exchanger exchange heat, temperature Rise to 80 DEG C, relative humidity be less than or equal to 3.5%, to sodium bicarbonate can either being assisted to grind, and can be good to bicarbonate Sodium is preheated, and sodium bicarbonate is avoided to decompose.

Be provided with into cigarette volume damper 20 between dehumidifying smoke-intake pipe 21 and dehumidifying chamber, dehumidifying pipe 19 and heating chamber it Between be provided with smoke volume damper 18, to facilitate the speed for adjusting flue gas inlet and outlet dehumidification device main body 12, pass through The temperature and relative humidity for controlling the flow velocity of flue gas to adjust the heat exchange of flue gas and dehumidify the time, and then adjust, it is easy to adjust, from And it disclosure satisfy that the fume treatment of different boilers 1.

As shown in Fig. 3 ~ 4：Sodium bicarbonate grinding device 7 includes feed bin 26, grinding machine 28 and powder conveying pipe 31, feed bin 26 It is vertically provided at the upper right of grinding machine 28, the lower part of feed bin 26 is the taper that from top to bottom diameter is gradually reduced, to convenient Sodium bicarbonate is delivered in grinding machine 28, grinding machine 28 is connected with the grinding motor 27 for driving its work.The upside of grinding machine 28 is Gas end, powder conveying pipe 31 is horizontally set on 28 upside of grinding machine, and the left end of powder conveying pipe 31 and the outlet side of grinding machine 28 connect Logical, in lower part, the inlet end of grinding machine 28 is connected with grinding device smoke-intake pipe 30 for the inlet end setting of grinding machine 28, and grinding device is into cigarette The inlet end of pipe 30 is connected to the outlet side of dehumidifying pipe 19, the flue gas after dehumidifying is introduced into grinding machine 28, grinding device It is provided with grinding device air-introduced machine 32 between smoke-intake pipe 30 and dehumidifying pipe 19, to realize the positive pressure of sodium bicarbonate powder Conveying uses common negative pressure transportation, meeting when material passes through wind turbine since sodium bicarbonate fine powder has very strong adsorptivity Adsorption precipitation is accumulated on impeller, influences impeller balance, and wind turbine is caused to shake cisco unity malfunction, and the utility model uses just Pressure conveying, makes transport system stable operation.The outlet side of powder conveying pipe 31 is also associated with grinding device pipe 34, grinding dress The outlet side for setting pipe 34 is connected to smoke backflow channel 11.

Grader 33 is provided between grinding machine 28 and powder conveying pipe 31, grader 33 is to entering powder conveying pipe 31 Powder is classified, and ensures that the sodium bicarbonate powder granularity entered in powder conveying pipe 31 is small, to when being mixed with flue gas Can more fully in flue gas nitrogen oxides and oxysulfide react, ensure that flue gas desulfurization and denitration effect Fruit.

It is additionally provided between feed bin 26 and grinding machine 28 for powder metering device, thus quantitative addition sodium bicarbonate, The dosage that sodium bicarbonate can preferably be controlled, not only having ensure that treated, flue gas is qualified, but also can avoid sodium bicarbonate dosage Excessively, cause fume treatment of high cost.

Sodium bicarbonate grinding device 7 is arranged in grinding chamber 22, and sodium bicarbonate grinding device 7 is mounted on grinding chamber 22 Left side, the right side of grinding chamber are sodium bicarbonate warehouse 23, and 23 upside of sodium bicarbonate warehouse is provided with ventilation opening 25, on ventilation opening 25 It is provided with for by 25 closed cover board of ventilation opening, being additionally provided with electric block 24 in grinding chamber 22, electric block 24 is used for carbon The discharging of sour hydrogen sodium also facilitates and sodium bicarbonate is added in feed bin 26, easy to use.

As shown in Figure 5：Powder warm-up block 6 includes powder heating tube 36, input temp sensor 37, output temperature sensing The inlet end of device 38 and control device, powder heating tube 36 is connected to the outlet side of grinding device pipe 34, powder heating The outlet side of pipe 36 is connected to the inlet end in smoke backflow channel 11, multiple heating tapes is provided in powder heating tube 36, and more A heating tape is arranged in parallel, and per the adjacent spaced 300mm of heating, and heating tape is wrapped in 36 outside of powder heating tube, each Heating tape is in series with control switch.In the present embodiment, heating tape has been arranged in parallel multigroup, and every group is in series with three heating Band, every group of heating tape are in series with control switch.In the present embodiment, heating tape is ceramic heat band.Input temp sensor 37 Inlet end in powder heating tube 36 is set, and output temperature sensor 38 is arranged in the outlet side of powder heating tube 36, input temperature Degree sensor 37 and output temperature sensor 38 are connect with control device, and control switch is also connect with control device, input temperature The monitoring in real time of degree sensor 37 enters the flue-gas temperature of powder heating tube 36, when flue-gas temperature is more than or equal to assigned temperature, Control device switchs control heating tape by control and does not work, and when flue-gas temperature is less than assigned temperature, control device control adds Torrid zone work, the flue-gas temperature after the monitoring heating in real time of output temperature sensor 38, control device is according to output temperature sensor 38 temperature detected adjust the quantity of heating tape work, to adjust the heating temperature of heating tape, realize that closed loop is adjusted, ensure Flue-gas temperature is stablized in assigned temperature, i.e., in reaction temperature section.The inlet end of powder heating tube 36 is equipped with powder and preheats valve 35, the break-make of flue gas entrance can be controlled, the cleaning and maintenance of powder heating tube 36 are facilitated.In the present embodiment, control device For PLC controller.Every group of heating tape is in series with temperature detect switch (TDS).

The utility model additionally provides a kind of processing method carrying out processing flue gas using above-mentioned dry method flue gas processing unit, Include the following steps：

1）To the flue gas ash removal of boiler 1；

The flue gas that boiler 1 is discharged is introduced into input deduster 2, the flue dust in flue gas is removed, to avoid in flue gas Flue dust interfere sodium bicarbonate powder to be mixed with flue gas, influence nitrogen oxides and oxysulfide in sodium bicarbonate powder and flue gas It reacts, additionally it is possible to reduce subsequent depositing dust intractability.

2）Partial fume is drawn, will be sent into sodium bicarbonate grinding device 7 after the flue gas dehumidifying after extraction；

Partial fume is drawn by auxillary flue 5, the flue gas of extraction enters in dehumidification device, flue gas preferentially enter except With 13 lower part of heat exchanger heat exchange occurs for wet intracavitary, and then exchanging heat again with cooler 14 condenses, and keeps the vapor in flue gas cold Lime set, then flue gas enter heating chamber and with the top of heat exchanger 13 exchange heat after enter back into sodium bicarbonate grinding device The grinding of auxiliary sodium bicarbonate in 7.

For the dry method flue gas processing unit when to the fume treatment of chain-grate boiler, the flue gas of chain-grate boiler is 100 DEG C ~ 130 DEG C, relative humidity is 6% ~ 7%, and the excessively high grinding that can influence sodium bicarbonate of humidity, flue gas with 13 lower part of heat exchanger after exchanging heat Reduce by 44 DEG C or so, into cooler 14 after temperature be down to 14 DEG C, due to temperature decrease, the vapor liquefaction in flue gas is simultaneously It is detached with flue gas, then the partial fume is sent into low-temperature receiver of the heat exchanger 13 as cooling, air discharging, and enters heat exchanger 13 The flue gas heat exchange of interior heat, makes the temperature for the flue gas being discharged by dehumidifying pipe 19 reach 80 DEG C, relative humidity is less than or equal to 3.5, and the flue-gas temperature of the heat on 13 top of heat exchanger can move down after reducing and be removed by being expelled on the right side of heat exchanger 13 Wet intracavitary.Dehumidification device can also avoid flue-gas temperature excessively high, and sodium bicarbonate is caused to decompose, and influence flue gas desulfurization and denitrification efficiency.

The flue-gas temperature entered in sodium bicarbonate grinding device is 80 DEG C, relative humidity 3.5%, directly by the flue gas It is introduced into grinding machine 28, to improve the grinding efficiency of grinding machine 28, the granularity after sodium bicarbonate grinding is reduced, after making grinding The granularity of sodium bicarbonate is 4 μm ~ 40 μm, preferably smaller than 20 μm.Temperature due to entering the flue gas in grinding machine 28 is 80 DEG C, The temperature of sodium bicarbonate powder after grinding can be made close to 80 DEG C.

3）Sodium bicarbonate powder after grinding mixes after the preheating of powder warm-up block 6 with flue gas；

Sodium bicarbonate powder after grinding is entered by way of positive pressure conveying in powder warm-up block 6, and by powder Warm-up block 6 preheats, and the temperature of sodium bicarbonate powder is made to reach 120 DEG C ~ 200 DEG C, preferably 120 DEG C ~ 140 DEG C, due to bicarbonate The temperature of sodium powder body is close to 80 DEG C, therefore the sodium bicarbonate powder after grinding only needs to improve 20 DEG C ~ 40 DEG C, reduces The energy consumption of powder warm-up block 6.Sodium bicarbonate powder after preheating is injected directly into flue collector 9, and with the flue gas in flue collector 9 It is sufficiently mixed, the nitrogen oxides and oxysulfide in sodium bicarbonate powder and flue gas that granularity is 4 μm ~ 20 μm are 120 DEG C ~ 140 DEG C temperature condition issue biochemical reaction, to by flue gas nitrogen oxides and oxysulfide remove, so as to by nitrogen Oxide and oxysulfide are completely converted into free of contamination substance, and the nitrogen oxides and oxysulfide after washing in flue gas can take off Except 40% ~ 50%, treated, and flue gas is up to state standards, can be with direct emission.

Sodium bicarbonate and the reaction principle that nitrogen oxides and oxysulfide chemically react are as follows：

2NaHCO₃ → Na₂CO₃ + H₂O +CO₂

2 NaHCO₃ + SO₃ → Na₂SO₄ + 2 CO₂↑ + H₂O

Na₂CO₃ + SO₃ → Na₂SO₄ + CO₂↑

2NaHCO₃ + SO₂ + ½O₂ ↔ Na₂SO₄ + H₂O + 2CO₂

2NaHCO₃ + SO₂ + NO + O₂ ↔ Na₂SO₄ + NO₂ + H₂O + 2CO₂

2NaHCO₃ + 2NO₂ + ½O₂ ↔ 2NaNO₃ + H₂O + 2CO₂

4Na₂SO₃ + 2NO₂ ↔ 4Na₂SO₄ + N₂

2NO + 2SO₂ ↔ 2SO₃ + N₂

2NaHCO₃ + SO₃ ↔ Na₂SO₄ + H₂O + 2CO₂

5）Gas after reaction is discharged after dedusting.

Contain the various solid materials generated after unreacted sodium bicarbonate powder and reaction, warp in gas after reaction After 39 dedusting of output deduster of 9 outlet side of flue collector, solid material is removed, and then flue gas enters in chimney 8, and by cigarette Chimney 8 discharges.

With existing selective non-catalytic reduction method（SNCR）And selective catalytic reduction（SCR）It compares, SNCR requirements The temperature of flue gas is 900 DEG C or so, and SCR requires the temperature of flue gas at 350 DEG C ~ 550 DEG C, can just get to best denitration effect Fruit, and the flue gas of the chain-grate boiler is only 100 DEG C, and the reaction temperature requirement of SNCR and SCR is not achieved completely, if to flue gas It is heated, is then consumed energy too high, fume treatment cost is excessively high, causes enterprise that can not bear.This dry method flue gas processing unit can The desulphurization denitration of low-temperature flue gas is solved well, and low energy consumption, and equipment cost is low, wide adaptation range, can either realize low-temperature flue gas Processing, the processing of high-temperature flue gas is also can adapt to, and sodium bicarbonate powder is directly mixed with flue gas, with spray solution phase Than the requirement to equipment is low, and reaction efficiency is high.

Embodiment 2

As shown in Fig. 6 ~ 7：Embodiment 2 and embodiment 1 difference lies in：Grinding device setting is in powder conveying pipe 31 and grinds Between mill apparatus pipe 34, the conveying of sodium bicarbonate powder is realized by the way of negative pressure transportation.Grinding device smoke-intake pipe 30 It is arranged at intervals on 31 downside of powder conveying pipe, and balance pipe is provided between grinding device smoke-intake pipe 30 and powder conveying pipe 31 29, balance pipe 29 is vertically arranged, and the upper end of balance pipe 29 is connected to the middle part of powder conveying pipe 31, the lower end of balance pipe 29 with Grinding device smoke-intake pipe 30 is connected to, and so as to balance the pressure of grinding device smoke-intake pipe 30 and powder conveying pipe 31, ensures cigarette Gas and the happy conveying of sodium bicarbonate powder, additionally it is possible to ensure that the flue gas flow rate entered in grinding machine 28 is moderate.

The above descriptions are merely preferred embodiments of the present invention, is not to make other forms to the utility model Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent The equivalent embodiment of variation.But it is every without departing from the content of the technical scheme of the utility model, the technology according to the utility model is real Any simple modification, equivalent variations and remodeling, still fall within the guarantor of technical solutions of the utility model made by confrontation above example Protect range.

Claims (8)

1. a kind of dry method flue gas processing unit, it is characterised in that：Including flue collector（9）, sodium bicarbonate grinding device（7）, powder Warm-up block（6）And output deduster（39）, flue collector（9）Inlet end be used for pending flue gas input, flue collector（9） Outlet side with output deduster（39）Inlet end connection, sodium bicarbonate grinding device（7）Inlet end and flue collector（9）'s Inlet end is connected to, sodium bicarbonate grinding device（7）Outlet side and flue collector（9）Connection, powder warm-up block（6）It is arranged in carbon Sour hydrogen sodium grinding device（7）And flue collector（9）Between；The flue collector（9）Inlet end be also associated with chimney meatus draught fan （3）, chimney meatus draught fan（3）Outlet side and flue collector（9）Inlet end connection, chimney meatus draught fan（3）Inlet end pass through pair Flue（5）With sodium bicarbonate grinding device（7）Inlet end connection, chimney meatus draught fan（3）Outlet side also pass through draw flue （4）With sodium bicarbonate grinding device（7）Inlet end connection, draw flue（4）And auxillary flue（5）On be both provided with valve, it is secondary Flue（5）On be additionally provided with dehumidification device.

2. dry method flue gas processing unit according to claim 1, it is characterised in that：The flue collector（9）Inlet end It is connected with input deduster（2）, input deduster（2）Outlet side and flue collector（9）Inlet end be connected, input deduster（2） Inlet end be used for pending flue gas input.

3. dry method flue gas processing unit according to claim 1, it is characterised in that：The sodium bicarbonate grinding device （7）Including feed bin（26）, grinding machine（28）And powder conveying pipe（31）, feed bin（26）It is arranged in grinding machine（28）Upside, grinding machine （28）Inlet end and flue collector（9）Inlet end connection, grinding machine（28）Outlet side pass through powder conveying pipe（31）With main cigarette Road（9）Connection.

4. dry method flue gas processing unit according to claim 3, it is characterised in that：The grinding machine（28）Inlet end also It is connected with grinding device air-introduced machine（32）.

5. dry method flue gas processing unit according to claim 4, it is characterised in that：The grinding machine（28）And powder conveying Pipe（31）Between be provided with grader（33）.

6. dry method flue gas processing unit according to claim 1, it is characterised in that：The sodium bicarbonate grinding device （7）Outlet side pass through smoke backflow channel（11）With flue collector（9）Connection, powder warm-up block（6）It is arranged in smoke backflow Channel（11）On.

7. dry method flue gas processing unit according to claim 1 or 6, it is characterised in that：The powder warm-up block（6） Including powder heating tube（36）, powder heating tube（36）It is arranged in flue collector（9）With sodium bicarbonate grinding device（7）Between, powder Body heating tube（36）Both ends respectively with flue collector（9）With sodium bicarbonate grinding device（7）Outlet side connection, powder heating tube （36）On be provided with heating tape.

8. dry method flue gas processing unit according to claim 7, it is characterised in that：The powder warm-up block（6）Also Including input temp sensor（37）And output temperature sensor（38）, input temp sensor（37）Setting is heated in powder Pipe（36）Inlet end, output temperature sensor（38）It is arranged in powder heating tube（36）Outlet side.