CN214552498U - Environment-friendly and energy-saving denitration system for boiler - Google Patents
Environment-friendly and energy-saving denitration system for boiler Download PDFInfo
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- CN214552498U CN214552498U CN202120647469.XU CN202120647469U CN214552498U CN 214552498 U CN214552498 U CN 214552498U CN 202120647469 U CN202120647469 U CN 202120647469U CN 214552498 U CN214552498 U CN 214552498U
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Abstract
The utility model provides an environment-friendly and energy-saving denitration system for a boiler, which comprises a solution conveying system, a mixer, an injection module, a flow monitoring module, a boiler detection module and a control system; solution conveying system, including softened water tank, softened water delivery pump, softened water conveyer pipe, ammonia water tank, aqueous ammonia delivery pump, aqueous ammonia conveyer pipe and converter, softened water delivery pump can pass through the softened water conveyer pipe with the solution in the softened water tank and carry to the blender in, aqueous ammonia delivery pump can pass through the aqueous ammonia conveyer pipe with the aqueous ammonia in the aqueous ammonia tank and carry to the blender in, softened water delivery pump and aqueous ammonia delivery pump still install and are provided with the converter, the converter links to each other with control system. The utility model discloses can adjust the use amount that the denitration was mixed liquid through frequency conversion screw pump according to the detection data developments, environmental protection and energy saving more.
Description
Technical Field
The utility model relates to a flue gas purification technical field especially relates to a boiler environmental protection and energy saving deNOx systems.
Background
With the development of modern industrialization, air pollution is also intensified, and the waste gas generated by burning a large amount of fossil fuel causes inevitable environmental pollution. Particularly, the nitrogen oxide as a main product can directly cause harm to the respiratory system, the central nervous system, the cardiovascular system and the like of a human body; the nitrogen oxides are combined with water in the air and finally converted into nitric acid and nitrate, the nitric acid is one of the causes of acid rain, the acid rain can greatly reduce the yield of crops, the protein content and the crop yield are reduced, and the acid rain can make the leaves of forests and other plants wither and yellow, aggravate diseases and insect pests and finally die in a large area; nitrogen oxides and other pollutants can generate photochemical smog pollution under certain conditions. In short, nitrogen oxide pollution directly or indirectly harms human health, ecosystems and building facilities.
The heat accumulating type combustion technology finishes heat exchange between discharged flue gas and charged combustion-supporting air through a heat accumulator arranged in the burners, the heat accumulating type burners are arranged on two sides of the furnace in pairs, each pair of heat accumulating type burners is in a combustion state, the other pair of heat accumulating type burners is in a smoke exhaust state, heat is absorbed by the heat accumulator and stored when the flue gas flows through the heat accumulating chamber, and the temperature of the flue gas discharged from the tail part is obviously reduced. The combustion air enters from the tail part of the regenerator and is discharged from the head part. When air flows through the heat storage chamber, the heat storage body releases heat, the heat is absorbed by the air to heat the air to high temperature (only 50-100 ℃ lower than the high-temperature flue gas temperature), and the heated air participates in combustion. The direction is changed at regular time, so that the original burning nozzle discharges smoke, and the burning of the original smoke discharging nozzle is repeated continuously.
The high-temperature air combustion technology has the following characteristics: the heat efficiency of various industrial furnaces or boilers is improved, and the average energy is saved by more than 30 percent to achieve the effects of improving the heat efficiency of the furnace, saving energy and reducing emission; the exhaust gas temperature is low, and a waste heat recovery system is basically not needed; the temperature uniformity in various industrial furnaces or boiler hearths is improved; various low heat value or inferior fuels are optimized, and high-quality fuels are saved; reducing the emission of harmful gases such as carbon dioxide and nitrogen oxides, and the like.
A lot of furnace bodies can be applied to denitration control technique and in order to control the content of nitrogen oxide in discharging fume, but current denitration control technique is not suitable for the deNOx systems of heat accumulation formula gas furnace because that can cause the denitration insufficient, even suitable it causes secondary pollution in return, threatens managers' personal safety.
And the existing boiler is lagged in controlling feeding of the denitrates, is not accurate enough, causes waste of materials, cannot regulate and control the water content of the solution, causes waste of a large amount of water resources, and wastes a large amount of natural gas resources due to the fact that excessive water is sprayed into the boiler, and the boiler burns and evaporates water, so that energy conservation and environmental protection are not enough.
There is a need for a novel boiler denitration system that can solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides an energy-concerving and environment-protective deNOx systems of boiler through carrying out the technological transformation to existing equipment, has solved that current denitration control system lags behind, and the energy consumption is more, the problem of energy-concerving and environment-protective inadequately.
In order to solve the technical problem, the utility model discloses specifically adopt following technical scheme:
an environment-friendly and energy-saving denitration system for a boiler comprises a solution conveying system, a mixer, an injection module, a flow monitoring module, a boiler detection module and a control system;
the solution conveying system comprises a softened water tank, a softened water conveying pump, a softened water conveying pipe, an ammonia water tank, an ammonia water conveying pump, an ammonia water conveying pipe and a frequency converter, wherein the softened water conveying pump can convey a solution in the softened water tank into the mixer through the softened water conveying pipe, the ammonia water conveying pump can convey ammonia water in the ammonia water tank into the mixer through the ammonia water conveying pipe, the softened water conveying pump and the ammonia water conveying pump are further provided with the frequency converters, and the frequency converters are connected with the control system;
a mixer capable of mixing ammonia water and softened water;
the spraying module is used for dispersedly spraying mixed liquid of softened water and ammonia water into a hearth of the boiler and comprises a liquid outlet pipeline, a spraying electromagnetic valve and a plurality of nozzles, the nozzles are arranged in the hearth of the boiler, the liquid outlet pipeline is arranged between the output end of the mixer and the nozzles, the spraying electromagnetic valve is further arranged at the nozzles and can atomize the mixed liquid and spray the atomized mixed liquid through the nozzles, and the spraying electromagnetic valve is electrically connected with the control system;
the flow monitoring module comprises a first flow meter and a second flow meter, the first flow meter is arranged on the ammonia water conveying pipe, and the second flow meter is arranged on a liquid outlet pipeline between the mixer and the nozzle;
the boiler detection module is arranged in a boiler furnace and comprises a flue gas analyzer, a temperature detection piece and a pressure detection piece, wherein the flue gas analyzer can detect the content of nitrogen oxides in flue gas discharged by the boiler, the temperature detection piece is used for detecting the temperature in the furnace, and the pressure detection piece is used for detecting the pressure in the furnace;
and the control system can control the operation of each module and can detect data through the boiler detection module to control the frequency of the frequency converter.
Preferably, the softened water delivery pump and the ammonia water delivery pump are variable frequency screw pumps.
Preferably, the softened water delivery pump and the ammonia water delivery pump are respectively provided with two sets of control switches, and the control switches are connected with the control system.
Preferably, still include the liquid level monitoring module, the liquid level monitoring module includes level sensor and alarm device, level sensor sets up in softening water tank and aqueous ammonia water tank, level sensor is connected with the alarm device electricity that the outside set up, level sensor can detect states and soften water tank and aqueous ammonia water tank interior solution residual volume.
Preferably, the control system is further connected with an external control display device, the control display device comprises a display and a control host, the display can display and store detection data in real time, and the control host can remotely control the operation of each module.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) the prior art delivery pump conveying efficiency is lower, and inconvenient control adjustment pump transmission rate, the utility model discloses be provided with demineralized water delivery pump and aqueous ammonia delivery pump, adopt the screw pump as the delivery pump and improved conveying efficiency, and control delivery rate feedback is faster, and it is more convenient to use.
2) In order to guarantee the effect of boiler department spraying denitration, the aqueous ammonia is carried to nozzle department through going out the liquid pipeline after mixing with the demineralized water, play liquid flow in the liquid pipeline needs to guarantee at a invariable value, the utility model discloses be provided with boiler detection module in the boiler, can be to nitrogen oxide content value in the boiler exhaust, temperature and pressure detect in the boiler, according to nitrogen oxide content and the boiler load that detect the acquisition, the delivery capacity of rethread control system control converter adjustment demineralized water delivery pump and aqueous ammonia delivery pump for it is certain to mix the liquid flow, through adjustment aqueous ammonia delivery pump and demineralized water delivery pump delivery capacity proportion, when playing the satisfied denitration effect, practice thrift the aqueous ammonia use amount, realize energy-concerving and environment-protective.
3) In order to obtain better detection feedback, the utility model discloses ammonia water conveyer pipe department with ammonia water delivery pump rear end is provided with first flowmeter, can follow the ammonia water delivery front end and just can obtain the ammonia water output quantity, can in time obtain the change feedback of ammonia water volume behind the control system control converter adjustment ammonia water delivery pump, can not appear adjusting lag, the problem of extravagant resource realizes energy-concerving and environment-protective.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic block diagram of the present invention;
description of reference numerals: softened water tank 1, softened water delivery pump 2, softened water delivery pipe 3, ammonia water tank 4, ammonia water delivery pump 5, ammonia water delivery pipe 6, mixer 7, liquid outlet pipe 8, nozzle 9, first flowmeter 10, second flowmeter 11.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings and examples.
As shown in fig. 1-2, the embodiment provides an environment-friendly and energy-saving denitration system for a boiler, which includes a solution conveying system, a mixer 7, an injection module, a flow monitoring module, a boiler detection module and a control system;
the solution conveying system comprises a softened water tank 1, a softened water conveying pump 2, a softened water conveying pipe 3, an ammonia water tank 4, an ammonia water conveying pump 5, an ammonia water conveying pipe 6 and a frequency converter, wherein the softened water conveying pump 2 can convey a solution in the softened water tank 1 into a mixer 7 through the softened water conveying pipe 3, the ammonia water conveying pump 5 can convey ammonia water in the ammonia water tank 4 into the mixer 7 through the ammonia water conveying pipe 6, the softened water conveying pump 2 and the ammonia water conveying pump 5 are further provided with the frequency converters, and the frequency converters are connected with the control system;
a mixer 7 capable of mixing ammonia water and softened water;
the spraying module is used for dispersedly spraying mixed liquid of softened water and ammonia water into a hearth of a boiler, the spraying module comprises a liquid outlet pipeline 8, a spraying electromagnetic valve and a plurality of nozzles 9, the nozzles 9 are arranged in the hearth of the boiler, the liquid outlet pipeline 8 is arranged between the output end of the mixer 7 and the nozzles 9, the spraying electromagnetic valve is further arranged at the positions of the nozzles 9, the spraying electromagnetic valve can atomize the mixed liquid and spray the atomized mixed liquid out through the nozzles 9, and the spraying electromagnetic valve is electrically connected with a control system;
the flow monitoring module comprises a first flow meter 10 and a second flow meter 11, wherein the first flow meter 10 is arranged on the ammonia water conveying pipe 6, and the second flow meter 11 is arranged on the liquid outlet pipeline 8 between the mixer 7 and the nozzle 9;
the boiler detection module is arranged in a boiler furnace and comprises a flue gas analyzer, a temperature detection piece and a pressure detection piece, wherein the flue gas analyzer can detect the content of nitrogen oxides in flue gas discharged by the boiler, the temperature detection piece is used for detecting the temperature in the furnace, and the pressure detection piece is used for detecting the pressure in the furnace;
and the control system can control the operation of each module and can detect data through the boiler detection module to control the frequency of the frequency converter.
Further, in order to obtain better conveying efficiency and conveniently control and adjust the conveying speed of the softened water and the ammonia water, the softened water conveying pump 2 and the ammonia water conveying pump 5 are variable-frequency screw pumps.
Further, in order to prevent the influence effect of removing the nitre when the delivery pump trouble, demineralized water delivery pump 2 and aqueous ammonia delivery pump 5 all have two sets ofly, demineralized water delivery pump 2 and aqueous ammonia delivery pump 5 are provided with control switch respectively, control switch links to each other with control system. One set of softened water delivery pump 2 and ammonia water delivery pump 5 are started, and when the softened water delivery pump 2 or the ammonia water delivery pump 5 fails, the other set of delivery pump is started, so that the normal operation of the system can be maintained.
Further, still include liquid level monitoring module, liquid level monitoring module includes level sensor and alarm device, level sensor sets up in softening water tank 1 and aqueous ammonia water tank 4, level sensor is connected with the alarm device electricity that the outside set up, level sensor can detect states and soften 1 and aqueous ammonia water tank 4 interior solution residual capacity. When the water quantity is lower than a certain margin, the alarm device automatically alarms to remind of timely replenishing the solution, the situation that the solution quantity in the softened water tank 1 or the ammonia water tank 4 is less and cutoff is caused can be avoided, and the problem that the solution quantity in the softened water tank 1 or the ammonia water tank 4 is too much and pressure is too high is also avoided.
Furthermore, in order to realize the remote monitoring and control of the whole denitration system, the control system is further connected with an external control display device, the control display device comprises a display and a control host, the display can display and store detection data in real time, and the control host can remotely control the operation of each module.
The flow rate QL2 detected by the second flow meter is constant, constant pressure and constant flow, the flow rate QL1 detected by the first flow meter can be regulated and controlled according to the boiler load F and the concentration M of nitrogen oxide NOx detected by boiler exhaust gas, the boiler load can be obtained from the temperature and the pressure of a boiler, and the regulated ammonia water and softened water jointly form mixed liquid.
The detected flow QL1 of the first flowmeter is K1F + K2M, wherein K1 and K2 are regulating coefficients
The method is characterized in that the concentration M of nitrogen oxides NOX is detected through the detected boiler load F and the boiler exhaust gas, the conveying proportion of ammonia water and softened water is adjusted in a variable frequency mode, and a new mixed liquid is prepared to meet the denitration effect of the boiler exhaust gas.
After the embodiment adopts this set of system to improve, the water consumption reduces to 100L/h from 300L/h, erects one year boiler and opens 8500h, actually reduces 8500X200 170000L, 170 tons promptly, and the water injection becomes steam and can take away a large amount of energy of boiler into the boiler, has reduced the water spray volume and has realized water economy resource and saving natural gas burning cost simultaneously, more energy-concerving and environment-protective.
The utility model discloses possess following characteristics:
1) the prior art delivery pump conveying efficiency is lower, and inconvenient control adjustment pump transmission rate, the utility model discloses be provided with demineralized water delivery pump and aqueous ammonia delivery pump, adopt the screw pump as the delivery pump and improved conveying efficiency, and control delivery rate feedback is faster, and it is more convenient to use.
2) In order to guarantee the effect of boiler department spraying denitration, the aqueous ammonia is carried to nozzle department through going out the liquid pipeline after mixing with the demineralized water, play liquid flow in the liquid pipeline needs to guarantee at a invariable value, the utility model discloses be provided with boiler detection module in the boiler, can be to nitrogen oxide content value in the boiler exhaust, temperature and pressure detect in the boiler, according to nitrogen oxide content and the boiler load that detect the acquisition, the delivery capacity of rethread control system control converter adjustment demineralized water delivery pump and aqueous ammonia delivery pump for it is certain to mix the liquid flow, through adjustment aqueous ammonia delivery pump and demineralized water delivery pump delivery capacity proportion, when playing the satisfied denitration effect, practice thrift the aqueous ammonia use amount, realize energy-concerving and environment-protective.
3) In order to obtain better detection feedback, the utility model discloses ammonia water conveyer pipe department with ammonia water delivery pump rear end is provided with first flowmeter, can follow the ammonia water delivery front end and just can obtain the ammonia water output quantity, can in time obtain the change feedback of ammonia water volume behind the control system control converter adjustment ammonia water delivery pump, can not appear adjusting lag, the problem of extravagant resource realizes energy-concerving and environment-protective.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connection mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt conventional model among the prior art, and conventional connection mode among the circuit connection adoption prior art is not detailed here again.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or through an intermediary, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
Claims (5)
1. The environment-friendly and energy-saving denitration system for the boiler is characterized by comprising a solution conveying system, a mixer, an injection module, a flow monitoring module, a boiler detection module and a control system;
the solution conveying system comprises a softened water tank, a softened water conveying pump, a softened water conveying pipe, an ammonia water tank, an ammonia water conveying pump, an ammonia water conveying pipe and a frequency converter, wherein the softened water conveying pump can convey a solution in the softened water tank into the mixer through the softened water conveying pipe, the ammonia water conveying pump can convey ammonia water in the ammonia water tank into the mixer through the ammonia water conveying pipe, the softened water conveying pump and the ammonia water conveying pump are further provided with the frequency converters, and the frequency converters are connected with the control system;
a mixer capable of mixing ammonia water and softened water;
the spraying module is used for dispersedly spraying mixed liquid of softened water and ammonia water into a hearth of the boiler and comprises a liquid outlet pipeline, a spraying electromagnetic valve and a plurality of nozzles, the nozzles are arranged in the hearth of the boiler, the liquid outlet pipeline is arranged between the output end of the mixer and the nozzles, the spraying electromagnetic valve is further arranged at the nozzles and can atomize the mixed liquid and spray the atomized mixed liquid through the nozzles, and the spraying electromagnetic valve is electrically connected with the control system;
the flow monitoring module comprises a first flow meter and a second flow meter, the first flow meter is arranged on the ammonia water conveying pipe, and the second flow meter is arranged on a liquid outlet pipeline between the mixer and the nozzle;
the boiler detection module is arranged in a boiler furnace and comprises a flue gas analyzer, a temperature detection piece and a pressure detection piece, wherein the flue gas analyzer can detect the content of nitrogen oxides in flue gas discharged by the boiler, the temperature detection piece is used for detecting the temperature in the furnace, and the pressure detection piece is used for detecting the pressure in the furnace;
and the control system can control the operation of each module and can detect data through the boiler detection module to control the frequency of the frequency converter.
2. The environment-friendly energy-saving denitration system of the boiler according to claim 1, wherein the softened water delivery pump and the ammonia water delivery pump are variable frequency screw pumps.
3. The environment-friendly energy-saving denitration system of the boiler according to claim 2, wherein there are two groups of the softened water delivery pump and the ammonia water delivery pump, the softened water delivery pump and the ammonia water delivery pump are respectively provided with a control switch, and the control switches are connected with the control system.
4. The environment-friendly energy-saving denitration system of the boiler according to claim 1, further comprising a liquid level monitoring module, wherein the liquid level monitoring module comprises a liquid level sensor and an alarm device, the liquid level sensor is arranged in the softened water tank and the ammonia water tank, the liquid level sensor is electrically connected with the alarm device arranged outside, and the liquid level sensor can detect the residual volume of the solution in the softened water tank and the ammonia water tank.
5. The environment-friendly energy-saving denitration system of the boiler according to claim 1, wherein the control system is further connected with an external control display device, the control display device comprises a display and a control host, the display can display and store detection data in real time, and the control host can remotely control the operation of each module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120647469.XU CN214552498U (en) | 2021-03-30 | 2021-03-30 | Environment-friendly and energy-saving denitration system for boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120647469.XU CN214552498U (en) | 2021-03-30 | 2021-03-30 | Environment-friendly and energy-saving denitration system for boiler |
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| CN214552498U true CN214552498U (en) | 2021-11-02 |
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| CN202120647469.XU Active CN214552498U (en) | 2021-03-30 | 2021-03-30 | Environment-friendly and energy-saving denitration system for boiler |
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- 2021-03-30 CN CN202120647469.XU patent/CN214552498U/en active Active
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