CN203744265U - Denitration system of incinerator - Google Patents

Denitration system of incinerator Download PDF

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Publication number
CN203744265U
CN203744265U CN201420045390.XU CN201420045390U CN203744265U CN 203744265 U CN203744265 U CN 203744265U CN 201420045390 U CN201420045390 U CN 201420045390U CN 203744265 U CN203744265 U CN 203744265U
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gas
burning
denitration
blown
exhausting
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CN201420045390.XU
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片畑正
内田博之
上原伸基
渡边敬太
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Kawasaki Heavy Industries Co Ltd
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Kawasaki Heavy Industries Co Ltd
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Abstract

The utility model discloses a denitration system of an incinerator. Nitric oxide concentration in burning gas exhausted from a burning chamber is lowered so that catalytic reaction equipment for lowering the nitric oxide concentration in the burning exhausted gas can be removed or miniaturized. Primary air (22) and secondary air (23) are blown into the burning chamber (18), waste (5) is burned, incineration disposal is carried out through the burning chamber (18) of the incinerator (14), and in the denitration system of the incinerator in which the burning exhausted gas (19) after burning and a denitration agent (20) are blown into the burning chamber (18) for denitration, compared with the positions where the primary air (22), the secondary air (23) and the burning exhausted gas (19) are blown into the burning chamber (18), the position where the denitration agent (20) is blown to the burning chamber (18) is close to the downstream side of a gas flowing direction (40).

Description

The denitrating system of incinerator
Technical field
The utility model relates to the denitrating system that is blown into the denitration medicament of ammoniacal liquor or urea water etc. in the combustion chamber of the incinerator that carries out burning disposal to making waste combustion and carry out the incinerator of denitration.
Background technology
Illustrate that with reference to Fig. 4 and Fig. 5 the example of method of denitration of existing incinerator is (for example, with reference to patent documentation 1.)。The method of denitration of this incinerator as shown in Figure 4, first, in the first stage, makes the discarded object 5 on the fire grate 1 in combustion chamber 2 burn by the supply of primary air 6.Then,, in second stage, oxygen-free gas or the less burning and gas-exhausting (blending agent) 8 of amount of oxygen are mixed with the burning and gas-exhausting 7 producing in this first stage.Then, consequent gaseous mixture 9 was at least detained for 0.3 second in retention areas 3.Then, substantially denitration medicament (reducing agent) 11 mixed with auxiliary air 10 and be blown into gaseous mixture 9.By means of this, seek the reduction of the nitrous oxides concentration in gaseous mixture 9, and the gaseous mixture 9 mixing with auxiliary air 10 becomes burning and gas-exhausting 12 and is delivered to downstream in the interior completing combustion of afterburner 4.
According to the method for denitration of this incinerator, owing to substantially denitration medicament (reducing agent) 11 being mixed with auxiliary air 10 and being blown in gaseous mixture 9, therefore do not need the additional equipment for being blown into denitration medicament 11, and together with the auxiliary air 10 of denitration medicament 11 and larger flow, supply with, therefore can effectively carry out and the mixing of gaseous mixture 9.
Prior art document:
Patent documentation:
Patent documentation 1: TOHKEMY 2001-90920 communique.
Utility model content
But, in the method for denitration of above-mentioned existing incinerator, consider following such problem.Fig. 5 is the gas flow position L of the burning and gas-exhausting in the combustion chamber 2 shown in schematically illustrated Fig. 4 and the nitrogen oxide (NO of burning and gas-exhausting x) figure of relation between concentration N and gas temperature T.
As shown in Figure 5, on the gas flow position L1 in combustion chamber 2, supply with primary air 6 and the gas temperature T of burning and gas-exhausting 7 that produces is T1, nitrous oxides concentration N is N1.Then, on the L2 of gas flow position, when to the interior supply burning and gas-exhausting 8 of burning and gas-exhausting 7, gas temperature T drops to T2, and nitrous oxides concentration N drops to N2.Then, on the L3 of gas flow position, in the time substantially denitration medicament (reducing agent) 11 being mixed with auxiliary air 10 and supplies with to burning and gas-exhausting 9, gas temperature T drops to T3 because of the impact of the supply of denitration medicament 11, and because of supply burning and gas-exhausting 9 completing combustions of auxiliary air 10, rise to T4 with this by T3.Like this in Fig. 5, the impact that difference produces because of the supply of denitration medicament 11 and the effect producing because of the supply of auxiliary air 10 variation that gas temperature T is shown, but both reactions for carry out simultaneously, therefore in the L3 of gas flow position, gas temperature T reaches in fact T4.
In addition,, about nitrous oxides concentration N, because the denitration reaction of denitration medicament 11 drops to N3, and the combustion reaction of carrying out because of the supply by auxiliary air 10 rises to N4.Like this in Fig. 5, with gas temperature T in the same manner, nitrous oxides concentration N is also the effect that produces because of the supply of denitration medicament 11 of difference and the impact producing because of the supply of auxiliary air 10 and illustrates, but both reactions for carry out simultaneously, therefore on the L3 of gas flow position, nitrous oxides concentration N reaches in fact N4.
Like this, in the method for denitration of the existing incinerator shown in Fig. 4, existence can not be given full play to the effect that nitrous oxides concentration N is reduced by denitration medicament 11, and the burning and gas-exhausting 12(nitrous oxides concentration N4 that nitrous oxides concentration N is increased) be released into the problem in atmosphere.
The utility model forms in order to solve problem as described above, its objective is and provide by reducing the nitrous oxides concentration the burning and gas-exhausting of discharging from combustion chamber, can omit for reducing the catalytic reaction device of the nitrous oxides concentration in burning and gas-exhausting or can denitrating system miniaturization and incinerator with this.
The means of dealing with problems:
In combustion chamber, to be blown into primary air and auxiliary air and to make waste combustion carry out the described combustion chamber of the incinerator of burning disposal according to the denitrating system of incinerator of the present utility model, be blown into burning and gas-exhausting after the burning in this combustion chamber and denitration medicament and carry out the denitrating system of the incinerator of denitration, wherein, possess and be arranged in described combustion chamber, be blown into portion for the denitration medicament that described denitration medicament is blown in described combustion chamber, described denitration medicament is blown into the position of portion and is blown into primary air to described combustion chamber, the downstream near gas flow direction is compared in the position of auxiliary air and burning and gas-exhausting.
According to the incinerator of denitrating system of application incinerator of the present utility model, can be blown into after primary air and auxiliary air to combustion chamber, make waste combustion and carry out burning disposal.And, according to the denitrating system of incinerator of the present utility model, by be blown into oxygen (O compared with air in this combustion chamber 2) burning and gas-exhausting that concentration is low, can suppress partial combustion and suppress nitrogen oxide (NO with this x) generation (substantially denitration), consequently, can seek the reduction of the nitrous oxides concentration in the burning and gas-exhausting in combustion chamber.
Again, the downstream near gas flow direction is compared in the position that is blown into primary air, auxiliary air and burning and gas-exhausting by make to be blown into the Yu Xiang combustion chamber, position of denitration medicament in combustion chamber, can have been reduced nitrogen oxide (NO by this denitration medicament to discharge in atmosphere with this x) burning and gas-exhausting of concentration (denitration).
And, by being blown into burning and gas-exhausting to combustion chamber, reduce the nitrous oxides concentration in the burning and gas-exhausting in combustion chamber with this, afterwards, in the burning and gas-exhausting having reduced to nitrous oxides concentration, be blown into denitration medicament, thereby further reduce nitrous oxides concentration, therefore can reduce the nitrous oxides concentration making in burning and gas-exhausting and drop to the required denitration pharmaceutical quantities of setting.
According in the denitrating system of incinerator of the present utility model, preferably the described denitration medicament portion of being blown into is provided with multiple, and possess the multiple Temperature Detectors for detection of the temperature in this combustion chamber that are arranged in described combustion chamber, with the mensuration temperature of carrying out based on detecting by described multiple Temperature Detectors, to the locus of the high mensuration temperature of the denitration efficiency of being obtained by the relation between temperature and denitration efficiency, be blown into the control part of the such control of denitration medicament from the denitration medicament portion of being blown into of setting corresponding to this locus.
Like this, mensuration temperature that can be based on detecting by the multiple Temperature Detectors that are arranged in combustion chamber, to the locus of the high mensuration temperature of the denitration efficiency of being obtained by the relation between temperature and denitration efficiency, be blown into denitration medicament from the denitration medicament portion of being blown into of setting corresponding to this locus.Here, the relation between temperature and denitration efficiency refers to following relation, that is, the denitration efficiency while denitration medicament being blown in the burning and gas-exhausting that comprises nitrogen oxide exists the difference of predetermining according to the temperature of burning and gas-exhausting.Therefore, be blown into denitration medicament by the existing locus of burning and gas-exhausting to the temperature that can obtain higher denitration efficiency, can effectively reduce the nitrous oxides concentration in (denitration) burning and gas-exhausting with this.
Also can be described multiple denitration medicament be blown into portion with the orthogonal direction of gas flow direction on arrange and configure, described multiple Temperature Detector is blown into the upstream side of portion and at least one side in downstream at the above multiple denitration medicament of gas flow direction, with the orthogonal direction of gas flow direction on arrange and configure.According to this structure, according to burning and gas-exhausting in the Temperature Distribution of the orthogonal direction of gas flow direction, can suitably determine the locus of the mensuration temperature that out of stock efficiency is high, and can carry out reliably the action that is blown into the denitration medicament of locus.
According in the denitrating system of incinerator of the present utility model, the locus of the mensuration temperature that preferably described denitration efficiency is high is that to measure temperature be the locus within the scope of 800~1000 DEG C.
Like this, the locus of the mensuration temperature that denitration efficiency is high is that mensuration temperature is the locus within the scope of 800~1000 DEG C, therefore by being blown into denitration medicament to this locus, can effectively reduce the nitrous oxides concentration in burning and gas-exhausting with this.
According in the denitrating system of incinerator of the present utility model, preferably be blown into burning and gas-exhausting in described combustion chamber and be a part for the burning and gas-exhausting that the processing processed finishes in exhaust gas treatment device, its remaining burning and gas-exhausting denitration in catalytic reaction device.
Like this, as the burning and gas-exhausting being blown in combustion chamber, use the burning and gas-exhausting that the processing of processing finishes in the exhaust gas treatment device of bag filter etc. time, can prevent from causing the contaminated situations such as circulation line that this burning and gas-exhausting passes through because being blown into black smoke in the burning and gas-exhausting in combustion chamber etc.And, the burning and gas-exhausting of discharging from exhaust gas treatment device is by the burning and gas-exhausting of circulation and denitration medicament and the gas of denitration, therefore in the case of being provided for making the catalytic reaction device of the further denitration of this burning and gas-exhausting, can seek the miniaturization of catalytic reaction device.
According in the denitrating system of incinerator of the present utility model, the leakage ammonia preferably producing because of the denitration medicament being blown in described combustion chamber is for the catalytic reaction of described catalytic reaction device.
By means of this, can seek to be arranged at the simplification of the ammonia supply unit in catalytic reaction device.
In addition, for being blown into primary air and auxiliary air and making waste combustion carry out the described combustion chamber of the incinerator of burning disposal in combustion chamber according to the method for denitration of incinerator of the present utility model, be blown into burning and gas-exhausting after the burning in this combustion chamber and denitration medicament and carry out the method for denitration of the incinerator of denitration, wherein, described denitration medicament is blown into the downstream of the position close gas flow direction be blown into the position of primary air, auxiliary air and burning and gas-exhausting to described combustion chamber compared with in described combustion chamber.
Carried out by the denitrating system according to incinerator of the present utility model according to the method for denitration of incinerator of the present utility model, have and the effect identical according to the denitrating system of incinerator of the present utility model.
According to the denitrating system of the method for denitration of incinerator of the present utility model and incinerator, by making the Bi Xiang combustion chamber, position that denitration medicament is blown in combustion chamber be blown into the position of primary air, auxiliary air and burning and gas-exhausting near the downstream of gas flow direction, can in atmosphere, discharge nitrogen oxide (NO with this x) burning and gas-exhausting that significantly reduces of concentration.By means of this, can omit for reducing the catalytic reaction device of the nitrous oxides concentration in burning and gas-exhausting or can miniaturization, therefore can seek the reduction of corresponding expense therewith.Consequently, can seek the simplification of the denitrating system of the incinerator of the method for denitration that uses this incinerator.
And, by omitting catalytic reaction device or make its miniaturization, become and do not need with the heating again of the burning and gas-exhausting being undertaken by steam that needs in this this catalytic reaction device, or can reduce and heat again required heat.By means of this, in the time utilizing the heat producing from this incinerator to generate electricity, can seek the improvement of the generating efficiency of TRT TRT.
Brief description of the drawings
Fig. 1 illustrates to use according to the system diagram of the incinerator of the method for denitration of the incinerator of an example of the present utility model;
Fig. 2 illustrates the gas flow position of the burning and gas-exhausting in the combustion chamber shown in Fig. 1 and the nitrogen oxide (NO of burning and gas-exhausting x) schematic diagram of relation between concentration and gas temperature;
Fig. 3 is the block diagram illustrating according to the control loop of the incinerator of above-mentioned example;
Fig. 4 is the system diagram that the incinerator of the method for denitration that uses existing incinerator is shown;
Fig. 5 illustrates the gas flow position of the burning and gas-exhausting in the combustion chamber shown in Fig. 4 and the nitrogen oxide (NO of burning and gas-exhausting x) schematic diagram of relation between concentration and gas temperature;
Symbol description:
5 discarded objects;
14 incinerators;
The denitrating system of 15 incinerators;
16 primary zones;
17 secondary combustion chambers;
18 combustion chambers;
The burning and gas-exhausting of 19 circulations;
20 denitration medicaments;
21 burning and gas-exhaustings;
22 primary airs;
23 auxiliary airs;
24 fire grates (stoker);
25 primary airs are supplied with oral area;
26 auxiliary airs are supplied with oral area;
27 first exhaust recycle gas pipe~three exhaust gas recirculatioon flues;
28 first gas supply port portion~three gas supply port portions;
29 first air valve~three air valves;
30 control parts;
31 first spray nozzles;
32 second spray nozzles;
33 the 3rd spray nozzles;
34 first denitration medicament supply pipes;
35 second denitration medicament supply pipes;
36 the 3rd denitration medicament supply pipes;
37 first medicament valves;
38 second medicament valves;
39 the 3rd medicament valves;
40 gas flow direction;
41 first Temperature Detectors;
42 second Temperature Detectors;
43 the 3rd Temperature Detectors;
44 the 4th Temperature Detectors;
45 nitrous oxides concentration detectors;
46 exhaust gas recirculatioon equipment.
Detailed description of the invention
Below, illustrate and use according to the incinerator of the method for denitration of incinerator of the present utility model example with reference to Fig. 1~Fig. 3.In the incinerator 14 shown in this Fig. 1, apply the denitrating system 15 of the incinerator that uses this method of denitration.This denitrating system 15 burn applicable to the interior burning discarded object 5 in the combustion chamber 18 for example thering is primary zone 16 and secondary combustion chamber 17 process incinerator 14, its primary zone 16 is blown into the burning and gas-exhausting 19 after the burning in this combustion chamber 18, and be blown into denitration medicament 20 to secondary combustion chamber 17, thereby can make burning and gas-exhausting 21 denitrations in this combustion chamber 18.In addition, in primary zone 16, be blown into primary air 22 and auxiliary air 23.
Incinerator 14 shown in this Fig. 1 possesses the discarded object 5(that supplies with various rubbish etc. by incinerated matter) hopper (not shown).This hopper is connected with primary zone 16 by slideway (shoot), and the discarded object 5 of supplying with from hopper is delivered to primary zone 16 by slideway.In primary zone 16, be provided with fire grate (stoker) 24.From the below of fire grate 24, primary air 22 is supplied with oral area 25 from primary air and is started to carry, and again, from top or the sidewall of primary zone 16, makes the auxiliary air 23 of unburned gas burning start to carry from auxiliary air supply oral area 26.
This primary zone 16 is connected with secondary combustion chamber 17 as shown in Figure 1, and the burning and gas-exhausting 21 producing because of the burning of discarded object 5 is delivered to secondary combustion chamber 17 from primary zone 16.This burning and gas-exhausting 21 carries out recuperation of heat in the first heat dissipation chamber of the waste heat boiler arranging on not shown downstream after again burning in secondary combustion chamber 17, and then, import economizer by the second heat dissipation chamber.Afterwards, in exhaust gas treatment device, complete after harmless treatment, by air exhauster and smoke stack emission to atmosphere.
Then, from exhaust gas treatment device, be discharged from a part of burning and gas-exhausting 19 as shown in Figure 1, for example, by being directed into the first gas supply port portion~three gas supply port portion 28 of primary zone 16 after the first exhaust recycle gas pipe~three exhaust gas recirculatioon flue 27, and be blown in primary zone 16.It is the reduction in order to seek the nitrous oxides concentration in the burning and gas-exhausting 21 in primary zone 16 that burning and gas-exhausting 19 is blown in this primary zone 16.
The burning and gas-exhausting 19 that is directed into the first gas supply port portion~three gas supply port portion 28 of primary zone 16 by this first exhaust recycle gas pipe~three exhaust gas recirculatioon flue 27, for example temperature T is 150~200 DEG C, O 2concentration O is 5~10%.
Again, the first gas supply port portion~three gas supply port portion 28 shown in Fig. 1 is arranged on top, dividing wall and the sidewall etc. of primary zone 16.And, on the first exhaust recycle gas pipe~three exhaust gas recirculatioon flue 27 being connected with the first gas supply port portion~three gas supply port portion 28, be respectively arranged with the first air valve~three air valve 29(control valve).
In these the first air valve~three air valves 29, open the air valve 29 of expectation, can in primary zone 16, be blown into burning and gas-exhausting 19 from the gas supply port portion 28 that is arranged at the expectation top, dividing wall and the sidewall of primary zone 16 with this.And these the first air valve~three air valves 29 are formed as by the control part 30(central operation treating apparatus shown in Fig. 3) carry out the structure of open and close controlling according to the program in storage part (not shown) of being stored in.
The exhaust gas recirculatioon equipment 46 forming as described above, the adjusting stage before the life's work of example incinerator 14 as shown in Figure 1, based on the service condition of incinerator 14, suitably set burning and gas-exhausting 19 to circulation position (being blown into position) and circular flow (being blown into flow) in primary zone 16.
Here, so-called circulation position (being blown into position) and the circular flow (being blown into flow) in primary zone 16 of suitably setting burning and gas-exhausting 19 refers to that this exhaust gas recirculatioon equipment 46 is set as not being blown into the state in secondary combustion chamber 17 from following the first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33 at denitration medicament 20, and the nitrous oxides concentration the burning and gas-exhausting 21 that can make to discharge from the chimney of the incinerator 14 shown in Fig. 1 is lower than predefined setting.
Here, as the method that determines best circulation position (the gas supply port portion 28 that burning and gas-exhausting 19 is blown), have the setting of each open and-shut mode of the first air valve~three air valve 29 shown in Fig. 1 is changed to multiple, and select the setting of the open and-shut mode of the air valve 29 that can relatively reduce the nitrous oxides concentration the burning and gas-exhausting 21 discharging from the chimney of incinerator 14, determine the method for this best circulation position with this.
But the nitrous oxides concentration the burning and gas-exhausting 21 discharging from chimney is that the nitrous oxides concentration detector (not shown) by being arranged at chimney inlet portion detects.This nitrous oxides concentration detector and control part 30 are electrically connected.
And, as the method that determines best circular flow (flow of the burning and gas-exhausting 19 blowing out from gas supply port portion 28), it is multiple having each regulation of the first air valve~three air valve 29 shown in Fig. 1, and select the aperture of the air valve 29 that can relatively reduce the nitrous oxides concentration the burning and gas-exhausting 21 discharging from the chimney of incinerator 14, determine the method for this best circular flow with this.
As shown in Figure 1, multiple the first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33(denitration medicament are installed on the sidewall of secondary combustion chamber 17 and are blown into portion) again.These first spray nozzles 31, the second spray nozzle 32, the 3rd spray nozzle 33 be for the denitration medicament 20 as ammoniacal liquor and urea water etc. is blown in this secondary combustion chamber 17, and be connected with the first denitration medicament supply pipe 34, the second denitration medicament supply pipe 35, the 3rd denitration medicament supply pipe 36.Denitration medicament 20 is directed into by pump in this first denitration medicament supply pipe 34, the second denitration medicament supply pipe 35, the 3rd denitration medicament supply pipe 36 together with carrying water.
These first spray nozzles 31, the second spray nozzle 32, the 3rd spray nozzle 33 roughly arranging in orthogonal direction and configure with gas flow direction 40, are set to three row respectively.Be provided with three spray nozzles 31 etc. each listing.And three the first spray nozzles 31 that are arranged at the downstream of gas flow direction 40 are arranged on the first denitration medicament supply pipe 34.And, be arranged on the second denitration medicament supply pipe 35 near three the second spray nozzles 32 that configure on the position of upstream side compared with the first spray nozzle 31, in addition be arranged on the 3rd denitration medicament supply pipe 36 near three the 3rd spray nozzles 33 that configure on the position of upstream side compared with the second spray nozzle 32.And, in these the first denitration medicaments supply pipe~three denitration medicament supply pipe 34 grades, be provided with the first medicament valve 37, the second medicament valve 38, the 3rd medicament valve 39(control valve).
In these the first medicament valves 37, the second medicament valve 38, the 3rd medicament valve 39, open the medicament valve 37 of expectation etc., can denitration medicament 20 be blown in secondary combustion chamber 17 from spray nozzle 31 grades of expectation of the sidewall that is arranged at secondary combustion chamber 17 with this.And these the first medicament valves 37, the second medicament valve 38, the 3rd medicament valve 39 are formed as being carried out according to the program in storage part (not shown) of being stored in by the control part 30 shown in Fig. 3 the structure of open and close controlling.
In addition, as shown in Figure 1, four the first Temperature Detectors 41, the second Temperature Detector 42, the 3rd Temperature Detector 43, the 4th Temperature Detector 44 are for example installed on the sidewall of secondary combustion chamber 17.These first Temperature Detectors 41, the second Temperature Detector 42, the 3rd Temperature Detector 43, the 4th Temperature Detector 44, for detection of the temperature in secondary combustion chamber 17, are electrically connected with the control part 30 shown in Fig. 3.And, the first Temperature Detector 41, the second Temperature Detector 42 are arranged on the position in the downstream of close gas flow direction 40 compared with three the first spray nozzles 31, and mutually arrange across compartment of terrain in the direction orthogonal with respect to gas flow direction 40.And the 3rd Temperature Detector 43, the 4th Temperature Detector 44, on the position near the upstream side of gas flow direction 40 compared with three the 3rd spray nozzles 33, are roughly arranging across compartment of terrain in orthogonal direction mutually with respect to gas flow direction 40.
Then, method of denitration, the denitrating system 15 of incinerator and the effect of having applied the incinerator 14 of method of denitration of incinerator are as constituted above described.According to the pulverizing stove 14 shown in this Fig. 1, in primary zone 16, be blown into primary air 22 and auxiliary air 23, thereby can make discarded object 5 burn and carry out burning disposal.And, according to the method for denitration of incinerator of the present utility model, be 1000~1100 DEG C to for example gas temperature of the 16(of this primary zone) in be blown into oxygen (O compared with air 2) (for example 5~10%) for example gas temperature of burning and gas-exhausting 19(that concentration is low is 150~200 DEG C), thereby can suppress with this generation (substantially denitration) that partial combustion suppresses nitrogen oxide (NOX), consequently, can seek the reduction (for example concentration is 60~80ppm) of the nitrous oxides concentration in the burning and gas-exhausting 21 of primary zone 16.
Again, as shown in Figure 1, by making the downstream of the position close gas flow direction 40 compared with being blown into the position of primary air 22, auxiliary air 23 and burning and gas-exhausting 19 that is blown into denitration medicament 20, can be reduced nitrogen oxide (NO by this denitration medicament 20 to release in atmosphere with this x) burning and gas-exhausting 21 of concentration (for example concentration is that 50ppm lower compared with 60~80ppm is following) (by denitration).
That is, the position that is blown into denitration medicament 20 is the position that is provided with the first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33, and this first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33 are arranged in secondary combustion chamber 17.And the position that is blown into primary air 22 is the position that is provided with primary air supply port 25, the position that is blown into auxiliary air 23 is the position that is provided with auxiliary air supply unit 26.And the position that is blown into burning and gas-exhausting 19 is the position that is provided with the first gas supply port portion~three gas supply port portion 28.These primary airs are supplied with oral area 25, auxiliary air supplies with oral area 26 and the first gas supply port portion~three gas supply port portion 28 is arranged at the primary zone 16 near upstream side compared with secondary combustion chamber 17.
And, in primary zone 16, be blown into burning and gas-exhausting 19 from the first gas supply port portion~three gas supply port portion 28, reduce the nitrous oxides concentration in the burning and gas-exhausting 21 of this primary zone 16 with this, afterwards, in secondary combustion chamber 17, from the first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33 is blown into denitration medicament 20 to having reduced in the burning and gas-exhausting 21 of nitrous oxides concentration, further reduce nitrous oxides concentration with this, therefore can reduce the nitrous oxides concentration making in burning and gas-exhausting 21 and be reduced to the required denitration pharmaceutical quantities of setting.
Like this, can significantly reduce the nitrogen oxide (NO in burning and gas-exhausting 21 x) concentration, can in atmosphere, discharge this burning and gas-exhausting 21.By means of this, can omit for reducing the catalytic reaction device of the nitrous oxides concentration in burning and gas-exhausting 21 or can miniaturization, therefore can seek the reduction of corresponding expense therewith.Consequently, can seek the simplification of the denitrating system 15 of the incinerator using in the method for denitration of this incinerator.
And by omitting catalytic reaction device or miniaturization, the heating again with this for the needed burning and gas-exhausting being undertaken by steam 21 of this catalytic reaction device becomes and does not need, and can reduce and heat required heat again.By means of this, the in the situation that of utilizing the heat producing from this incinerator 14 to generate electricity, can seek the improvement of the generating efficiency of TRT TRT.
In addition, in the time that catalytic reaction device is arranged to this incinerator 14, be arranged at the downstream of the exhaust gas treatment device that comprises bag filter etc.
Again, control part 30 shown in Fig. 3 is formed as following structure, , based on passing through the first Temperature Detector 41, the second Temperature Detector 42, the 3rd Temperature Detector 43, the mensuration temperature that the 4th Temperature Detector 44 detects, to the locus of the high mensuration temperature of the denitration efficiency of being obtained by the relation between temperature and denitration efficiency, from the first spray nozzle 31 of setting corresponding to this locus, the second spray nozzle 32, the 3rd spray nozzle 33(denitration medicament is blown into portion) in any one spray nozzle 31 etc., or all spray nozzles 31 etc. are blown into denitration medicament 20.
Like this, mensuration temperature that can be based on by detecting at the first Temperature Detector 41, the second Temperature Detector 42, the 3rd Temperature Detector 43, the 4th Temperature Detector 44 of secondary combustion chamber 17 interior settings, to the locus of the high mensuration temperature of the denitration efficiency of being obtained by the relation between temperature and denitration efficiency, be blown into denitration medicament 20 from spray nozzle 31 grades of setting corresponding to this locus.
Here, the relation between temperature and denitration efficiency refers to following relation, that is, the denitration efficiency while denitration medicament being blown in the burning and gas-exhausting that comprises nitrogen oxide exists the difference of predetermining according to the temperature of burning and gas-exhausting.Therefore,, by denitration medicament 20 being blown on the locus at burning and gas-exhausting 21 places of the temperature that can obtain high denitration efficiency, can effectively reduce the nitrous oxides concentration in burning and gas-exhausting 21 with this.
In this example, the locus of the mensuration temperature that denitration efficiency is high is that to measure temperature be 800~1000 DEG C, the locus in the scope of 850~950 DEG C preferably.
Like this, the locus of the mensuration temperature that denitration efficiency is high is that to measure temperature be 800~1000 DEG C, the locus in the scope of 850~950 DEG C preferably, therefore by being blown into denitration medicament 20 to this locus, can effectively reduce the nitrous oxides concentration in burning and gas-exhausting 21 with this.
Again, denitration efficiency refers to the efficiency that can reduce the nitrous oxides concentration in burning and gas-exhausting 21, in the burning and gas-exhausting 21 that for example nitrous oxides concentration is 100ppm, be blown into denitration medicament 20 and can make nitrous oxides concentration be reduced to 40ppm with this, can say that denitration efficiency is high compared with can being reduced to the situation of 60ppm.
Then, key diagram 2.Fig. 2 illustrates the gas flow position L of the burning and gas-exhausting 21 in the primary zone 16 shown in Fig. 1 and secondary combustion chamber 17 and the nitrogen oxide (NO of burning and gas-exhausting 21 x) schematic diagram of relation between concentration N and gas temperature T.
As shown in Figure 2, on the gas flow position L5 in primary zone 16, under the state of burning and gas-exhausting 21 feeding secondary airs 23, gas temperature T is T5, and nitrous oxides concentration N is N5.Then, on the L6 of gas flow position, while supplying with the burning and gas-exhausting 19 of circulation to burning and gas-exhausting 21, gas temperature T drops to T6, and nitrous oxides concentration N drops to N6.Then, on the gas flow position L7 in primary zone 6, while supplying with denitration medicament 20 to burning and gas-exhausting 21, gas temperature T further drops to T7, and nitrous oxides concentration N further drops to N7.
Like this, according to the method for denitration of the incinerator shown in Fig. 2, can give full play to by the effect that nitrous oxides concentration N is reduced of burning and gas-exhausting 19 and the denitration medicament 20 of circulation, can in atmosphere, discharge the burning and gas-exhausting 21(nitrous oxides concentration N7 that has fully reduced nitrous oxides concentration N).
But, in above-mentioned example, be formed as making a part (burning and gas-exhausting 19) for the burning and gas-exhausting 21 that the processing of processing in exhaust gas treatment device finishes circulate and be blown in primary zone 16, the structure of its remaining burning and gas-exhausting 21 from smoke stack emission to atmosphere, also can be formed as making its remaining burning and gas-exhausting 21 structure from smoke stack emission to atmosphere after denitration in catalytic reaction device but replace.
As the burning and gas-exhausting 19 being blown in primary zone 16, also can use the burning and gas-exhausting 19 before processing in exhaust gas treatment device, but in the time of the exhaust that uses the processing of processing in the exhaust gas treatment device of bag filter etc. to finish, can prevent from causing the contaminated situations such as the first exhaust recycle gas pipe~three exhaust gas recirculatioon flue 27 that this burning and gas-exhausting 19 passes through because being blown into black smoke in the burning and gas-exhausting 19 in primary zone 16 etc.And, the burning and gas-exhausting 21 of discharging from exhaust gas treatment device is by the burning and gas-exhausting 19 of circulation and denitration medicament 20 and the burning and gas-exhausting of denitration, therefore in the case of being provided for making the catalytic reaction device of these burning and gas-exhausting 21 further denitrations, can seek the miniaturization of catalytic reaction device.
And, also the leakage ammonia producing because of the denitration medicament 20 being blown in secondary combustion chamber 17 (slip ammonia) can be used in to the catalytic reaction in above-mentioned catalytic reaction device.By means of this, can seek to be arranged at the simplification of the ammonia supply unit in catalytic reaction device.
Again, although the incinerator of above-mentioned example 14 has been lifted the example of fire grate form, replacing can be also fluid bed form.
In addition, in above-mentioned example, as shown in Figure 1, be formed as being provided with the structure of the first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33, the first denitration medicament supply pipe 34, the second denitration medicament supply pipe 35, the 3rd denitration medicament supply pipe 36 and the first medicament valve 37, the second medicament valve 38, the 3rd medicament valve 39, but can be also structure in addition.For example the amount of being blown into of quantity, configuration and the denitration medicament 20 of the first spray nozzle 31, the second spray nozzle 32, the 3rd spray nozzle 33, the first denitration medicament supply pipe 34, the second denitration medicament supply pipe 35, the 3rd denitration medicament supply pipe 36 and the first medicament valve 37, the second medicament valve 38, the 3rd medicament valve 39, can change according to size, the performance etc. of incinerator 14.
And, in above-mentioned example, also can be that nitrous oxides concentration detector 45 is set on chimney inlet portion, detect the nitrous oxides concentration N from the burning and gas-exhausting 21 of smoke stack emission by this nitrous oxides concentration detector 45, and control be blown into burning and gas-exhausting 19 in primary zone 16 be blown into position and the amount of being blown into and be blown into secondary combustion chamber 17 denitration medicament 20 be blown into position and the amount of being blown into etc. so that reach predefined concentration NS from the nitrous oxides concentration N of this smoke stack emission.By means of this, even in the time that the proterties of discarded object 5 changes or be supplied to the quantity delivered change of the discarded object 5 in primary zone 16, also can control so that the nitrous oxides concentration N from the burning and gas-exhausting 21 of smoke stack emission reaches predefined concentration NS.
Again, in above-mentioned example, although adopted first to fourth Temperature Detector 41,42,43,44, but can only use the 3rd Temperature Detector 43 and the 4th Temperature Detector 44 of the upstream side that is disposed at the first to the 3rd spray nozzle 31,32,33 in gas flow direction, can also only use the first Temperature Detector 41 and second Temperature Detector 42 in the downstream that is disposed at the first to the 3rd spray nozzle 31,32,33 in gas flow direction.
Like this, have by reducing the nitrous oxides concentration the burning and gas-exhausting of discharging from combustion chamber according to the denitrating system of the method for denitration of incinerator of the present utility model and incinerator, can omit for reducing the catalytic reaction device of the nitrous oxides concentration in burning and gas-exhausting or excellent effect that can miniaturization with this, be applicable to being applied in the method for denitration of such incinerator and the denitrating system of incinerator.

Claims (6)

1. the denitrating system of an incinerator, in combustion chamber, be blown into primary air and auxiliary air and make waste combustion and carry out the described combustion chamber of the incinerator of burning disposal, be blown into burning and gas-exhausting after the burning in this combustion chamber and denitration medicament and carry out the denitrating system of the incinerator of denitration, it is characterized in that
Possess and be arranged in described combustion chamber, be blown into portion for the denitration medicament that described denitration medicament is blown in described combustion chamber;
The downstream of close gas flow direction compared with described denitration medicament is blown into the position of portion and is blown into the position of primary air, auxiliary air and burning and gas-exhausting to described combustion chamber.
2. the denitrating system of incinerator according to claim 1, is characterized in that,
The described denitration medicament portion of being blown into is provided with multiple;
Also possess the multiple Temperature Detectors for detection of the temperature in this combustion chamber that are arranged in described combustion chamber; With
Carry out the mensuration temperature based on detecting by described multiple Temperature Detectors, to the locus of the high mensuration temperature of the denitration efficiency of being obtained by the relation between temperature and denitration efficiency, be blown into the control part of the such control of denitration medicament from the denitration medicament portion of being blown into of setting corresponding to this locus.
3. the denitrating system of incinerator according to claim 2, is characterized in that,
Described multiple denitration medicament be blown into portion with the orthogonal direction of gas flow direction on arrange and configure;
Described multiple Temperature Detector is blown into the upstream side of portion and at least one side in downstream at the above multiple denitration medicament of gas flow direction, with the orthogonal direction of gas flow direction on arrange and configure.
4. the denitrating system of incinerator according to claim 2, is characterized in that, the locus of the mensuration temperature that described denitration efficiency is high is that mensuration temperature is the locus within the scope of 800~1000 DEG C.
5. according to the denitrating system of the incinerator described in any one in claim 1 to 4, it is characterized in that, be blown into burning and gas-exhausting in described combustion chamber and be a part for the burning and gas-exhausting that the processing processed finishes in exhaust gas treatment device, its remaining burning and gas-exhausting denitration in catalytic reaction device.
6. the denitrating system of incinerator according to claim 5, is characterized in that, the leakage ammonia producing because of the denitration medicament being blown in described combustion chamber is for the catalytic reaction of described catalytic reaction device.
CN201420045390.XU 2014-01-24 2014-01-24 Denitration system of incinerator Active CN203744265U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104807019A (en) * 2014-01-24 2015-07-29 川崎重工业株式会社 Denitration method for incinerator and denitration system for incinerator
CN104819477A (en) * 2015-05-07 2015-08-05 南通天蓝环保能源成套设备有限公司 Multi-physical-state incineration technology for industrial hazardous wastes
CN106054608A (en) * 2016-06-21 2016-10-26 光大环保技术研究院(深圳)有限公司 Fuzzy control method and system for waste incineration flue gas denitration SNCR (Selective Non Catalytic Reduction)
JP2019007699A (en) * 2017-06-27 2019-01-17 川崎重工業株式会社 Primary combustion gas supply control method, evaporation amount stabilization method, power generation amount stabilization method and fire grate type waste incinerator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104807019A (en) * 2014-01-24 2015-07-29 川崎重工业株式会社 Denitration method for incinerator and denitration system for incinerator
CN104807019B (en) * 2014-01-24 2018-02-23 川崎重工业株式会社 The method of denitration of incinerator and the denitrating system of incinerator
CN104819477A (en) * 2015-05-07 2015-08-05 南通天蓝环保能源成套设备有限公司 Multi-physical-state incineration technology for industrial hazardous wastes
CN106054608A (en) * 2016-06-21 2016-10-26 光大环保技术研究院(深圳)有限公司 Fuzzy control method and system for waste incineration flue gas denitration SNCR (Selective Non Catalytic Reduction)
JP2019007699A (en) * 2017-06-27 2019-01-17 川崎重工業株式会社 Primary combustion gas supply control method, evaporation amount stabilization method, power generation amount stabilization method and fire grate type waste incinerator

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