阅读说明：本技术 具有激光氧分析仪的危废处理系统 (Useless processing system of danger with laser oxygen analysis appearance ) 是由 康海明 冯宇 徐浩 史亚利 雷磊 于 2018-07-24 设计创作，主要内容包括：一种具有激光氧分析仪的危废处理系统,包括二燃室和设置在所述二燃室的出口管道上的激光氧分析仪,其中所述激光氧分析仪包括发射单元和接收单元,所述发射单元和所述接收单元相对设置,并通过电缆相连。本发明中的激光氧分析仪通过烟气对光谱的吸收来测定氧含量,响应时间短,不会造成误差升级,设备免清洗,只需定期检修校正即可,不会对工艺产生影响。(The utility model provides a useless processing system of danger with laser oxygen analysis appearance, includes the second combustion chamber and sets up laser oxygen analysis appearance on the export pipeline of second combustion chamber, wherein laser oxygen analysis appearance includes transmitting unit and receiving element, transmitting unit with the receiving element sets up relatively to link to each other through the cable. The laser oxygen analyzer disclosed by the invention is used for measuring the oxygen content through the absorption of the flue gas to the spectrum, the response time is short, the error upgrade cannot be caused, the equipment is free from cleaning, only the regular maintenance and correction are needed, and the process cannot be influenced.)

1. The utility model provides a useless processing system of danger with laser oxygen analysis appearance which characterized in that, is in including second combustion chamber and setting laser oxygen analysis appearance on the export pipeline of second combustion chamber, wherein laser oxygen analysis appearance includes transmitting element and receiving element, transmitting element with the receiving element sets up relatively to link to each other through the cable.

2. The hazardous waste treatment system of claim 1, wherein the laser oxygen analyzer further comprises a purging unit for purging an optical window of the emission unit, the emission unit is fixedly connected with the purging unit, and the purging unit is mounted on the mounting flange on the outlet pipeline.

3. The hazardous waste disposal system of claim 2, wherein an adapter ring is disposed between the emission unit and the purge unit and connected thereto by a mounting nut.

4. The hazardous waste treatment system of claim 1, wherein the laser oxygen analyzer further comprises a purging unit for purging an optical window of the receiving unit, the receiving unit is fixedly connected with the purging unit, and the purging unit is mounted on a mounting flange on the outlet pipeline.

5. The hazardous waste disposal system of claim 4, wherein an adapter ring is disposed between the receiving unit and the purge unit and connected thereto by a mounting nut.

6. The hazardous waste treatment system of any one of claims 2-5, wherein the purge unit comprises a filter, a pressure relief valve and a flow stabilizer.

7. The hazardous waste treatment system of claim 1, wherein the receiving unit is provided with a span gas inlet.

8. The hazardous waste treatment system of claim 1, further comprising a heat exchanger connected to the outlet conduit of the secondary combustion chamber.

9. The hazardous waste treatment system of claim 1, further comprising a tail gas treatment device connected to the flue gas outlet of the heat exchanger.

10. The hazardous waste treatment system of claim 1, wherein a combustion chamber of the hazardous waste treatment system is a rotary kiln.

Technical Field

The invention belongs to the field of hazardous waste treatment, and particularly relates to a hazardous waste treatment system with a laser oxygen analyzer, which is mainly used for monitoring the oxygen content in flue gas in industries such as hazardous waste incineration treatment and the like.

Background

Incineration is a common method used in hazardous waste treatment, the main equipment of which is an incinerator. The incinerator is generally provided with two combustion chambers, i.e., a first combustion chamber and a second combustion chamber, and adopts a two-stage combustion mode, wherein the first combustion chamber burns solids, and the second combustion chamber burns gas: after entering a combustion chamber, the hazardous waste is dried, anaerobically pyrolyzed and burnt out under the condition of preset temperature; the gas generated by pyrolysis enters the second combustion chamber for full combustion, and the toxic and harmful gas in the second combustion chamber can be effectively treated. The heat contained in the final tail gas can be recycled through equipment such as a heat exchanger.

At present, the most common incineration process in the hazardous waste treatment industry is a rotary kiln incineration process, and the national standard GB18484 definitely requires that the oxygen content (dry gas) of flue gas is controlled to be 6-10%.

If the oxygen content is monitored only by the CEMS arranged on the chimney, the final air supplement point is in the secondary combustion chamber, and the flue gas passes through a heat exchanger, a quench tower, a dust remover, an acid removal tower, a heat exchanger and other devices from the outlet of the secondary combustion chamber to the chimney, the CEMS on the chimney can be detected after a long period of time, so that the control delay is necessary, and the adjustment is easy. If the oxygen content detection equipment is arranged at the outlet of the secondary combustion chamber, the air supplement amount can be adjusted in time to control the oxygen content of the flue gas.

The traditional conventional oxygen content detection equipment is a zirconia oxygen analyzer, which converts oxygen concentration difference potential generated by extending a sensor into flue gas through direct detection and comparison to standard gas into oxygen content. The higher the temperature of the medium detected by the zirconia oxygen analyzer is, the longer the response time is, the outlet temperature of the second combustion chamber is more than 1100 ℃, and the zirconia oxygen analyzer needs 1min for stable measurement; secondly, the flue gas at the outlet of the second combustion chamber is not subjected to dust removal treatment, and has a certain dust amount, so that dust can be quickly attached to the sensor, and the measurement deviation is larger and larger; in addition, since the dust is also hazardous waste and is in a high temperature region, the maintenance and cleaning is also dangerous, and the shutdown of the furnace due to cleaning of the sensor is also economically unreasonable.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a hazardous waste treatment system with a laser oxygen analyzer, which can obviously improve the response speed, measurement accuracy and reliability of oxygen content detection.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a useless processing system of danger with laser oxygen analysis appearance, includes the second combustion chamber and sets up laser oxygen analysis appearance on the export pipeline of second combustion chamber, wherein laser oxygen analysis appearance includes transmitting unit and receiving element, transmitting unit with the receiving element sets up relatively to link to each other through the cable.

Preferably, the laser oxygen analyzer further comprises a purging unit for purging the optical window of the emission unit, the emission unit is fixedly connected with the purging unit, and the purging unit is mounted on the mounting flange on the outlet pipeline.

Preferably, an adapter ring is arranged between the emission unit and the purging unit and is connected with the emission unit and the purging unit through a mounting nut.

Preferably, the laser oxygen analyzer further comprises a purging unit for purging the optical window of the receiving unit, the receiving unit is fixedly connected with the purging unit, and the purging unit is mounted on the mounting flange on the outlet pipeline.

Preferably, an adapter ring is arranged between the receiving unit and the purging unit and is connected with the receiving unit and the purging unit through a mounting nut.

Preferably, the purge unit comprises a filter, a pressure reducing valve and a flow stabilizer.

Preferably, a span gas inlet is arranged on the receiving unit.

Preferably, the hazardous waste treatment system further comprises a heat exchanger, and the heat exchanger is connected with an outlet pipeline of the secondary combustion chamber.

Preferably, the hazardous waste treatment system further comprises a tail gas treatment device, and the tail gas treatment device is connected with the flue gas outlet of the heat exchanger.

Preferably, a combustion chamber of the hazardous waste treatment system is a rotary kiln.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

firstly, the laser oxygen analyzer measures the oxygen content through the absorption of the smoke to the spectrum, and the laser oxygen analyzer is irrelevant to the temperature of a detection medium, has very short response time and can reach within 2 s; secondly, the laser oxygen analyzer is in a non-contact type, laser is emitted from the emitting end to the receiving end through the optical window, and only the optical window needs to be cooled and blown, so that error upgrading cannot be caused; the equipment is free from cleaning, and only needs to be periodically overhauled and corrected, so that the process is not influenced.

Drawings

FIG. 1 is a schematic diagram of a hazardous waste treatment system in an embodiment of the invention;

fig. 2 is a laser oxygen analyzer in an embodiment of the present invention.

Detailed Description

In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.

In view of various defects of the zirconia oxygen analyzer, the invention uses the laser oxygen analyzer to replace the traditional zirconia oxygen analyzer, and thoroughly solves the problems in the prior art. The laser gas analyzer uses a spectral absorption technique to obtain the concentration of the gas by analyzing the selective absorption of the laser light by the gas. Strong laser anti-interference performance and no H₂O and CO₂The influence of the content is more accurate in measurement. The laser gas on-line analyzer is suitable for severe industrial environment application, and can be used for continuous industrial process and gas emission measurement. The in-situ laser gas analyzer is characterized in that a laser emitting module and a photoelectric sensing module are directly installed on a process pipeline, and the measured gas in the pipeline is directly analyzed on line.

Therefore, when the laser oxygen analyzer is used for detecting the oxygen content, the oxygen content is not influenced by background gas, and compared with a zirconia oxygen analyzer, the oxygen content detection device is more resistant to the influence of dust pollution and can automatically correct the influence of pressure and temperature on measurement. Therefore, the measurement precision is high, the response speed is high, and the reliability is high.

As shown in fig. 1, the hazardous waste treatment system in the embodiment of the present invention includes: the device comprises a first combustion chamber 100, a second combustion chamber 200, a laser oxygen analyzer 300 and a heat exchanger 400, wherein the laser oxygen analyzer 300 is arranged on a pipeline between the second combustion chamber 200 and the heat exchanger 400.

A combustion chamber 100, which may be a rotary kiln or other incineration device, is used to burn hazardous waste. In one embodiment, the temperature of the first combustion chamber 100 is controlled to be 850-950 ℃, and the incineration removal rate is more than 99%. When the hazardous waste is burned, smoke containing a large amount of toxic and harmful gas components is generally generated, and the generated smoke is introduced into the secondary combustion chamber 200 to be further burned so as to remove the toxic and harmful gas components therein.

In order to thoroughly decompose unburned substances including toxic and harmful gas components in the flue gas, the secondary combustion chamber 200 is provided with a secondary air supply device 201 for ensuring that the flue gas is fully contacted with oxygen at high temperature, ensuring the residence time of the flue gas in the secondary combustion chamber 200 and adjusting the air supply quantity according to the oxygen content of the flue gas at the outlet of the secondary combustion chamber 200. In one embodiment, the temperature in the secondary combustion chamber 200 is controlled to be 1000-1300 ℃, the residence time of the flue gas in the secondary combustion chamber 200 is more than 2s, so that the flue gas is fully decomposed and incinerated in the secondary combustion chamber 200, and a higher decomposition rate is realized. Meanwhile, the dust with large particle size in the flue gas falls into the bottom of the secondary combustion chamber 200 to complete primary dust removal. The oxygen content of the flue gas at the outlet of the secondary combustion chamber 200 is monitored on line by a laser oxygen analyzer 300.

The flue gas after combustion in the second combustion chamber 200 contains abundant heat, so the flue gas is introduced into the heat exchanger 400 for heat recovery, and the final tail gas can be further purified by using tail gas treatment equipment to meet the emission standard requirements, for example, the tail gas treatment equipment can be selected from one or more of a spray absorption tower, activated carbon adsorption, a high-efficiency bag type dust collector and the like.

As shown in fig. 2, the laser oxygen analyzer 300 includes a transmitting unit 301, a receiving unit 315, a first purge unit 305, and a second purge unit 308, and the transmitting unit 301 is disposed opposite to the receiving unit 315 and connected thereto by a cable 318. The transmitter unit 301 includes a laser, optical components, a controller, a human-machine interface, such as a liquid crystal display 316, and the transmitter unit 301 is connected to a power source via a power cable 317. The receiving unit 315 includes a photosensor, an optical element, a signal processor, and the like. The first purge unit 305 and the second purge unit 308 include a filter, a pressure reducing valve, a flow stabilizer, and the like.

The emission unit 301 and the first purge unit 305 are fixedly connected through a first mounting nut 302 and a first adapter ring 304, and a purge gas inlet 307 is disposed on the first purge unit 305 to purge the optical window 303 of the emission unit 301. The first purge unit 305 is fixedly attached to a first mounting flange 306 of the duct.

The receiving unit 315 is fixedly connected with the second purging unit 308 through a second mounting nut 313 and a second adapter ring 311, and the second purging unit 308 is provided with a purging gas inlet 310 capable of purging an optical window 312 of the receiving unit 315. The second purge unit 308 is fixedly attached to a second mounting flange 309 of the conduit. The receiving unit 315 also includes a span gas inlet 314.

The laser oxygen analyzer measures the oxygen content through the absorption of the smoke to the spectrum, is irrelevant to the temperature of a detection medium, has very short response time, and can reach within 2 s. Because laser oxygen analysis appearance is non-contact, sees through the optical window and launches laser from the transmitting element to the receiving element, only need to cool off the optical window sweep can, can not cause the error to upgrade. In addition, the equipment of the invention does not need to be cleaned, and only needs to be periodically overhauled and corrected, thereby having no influence on the process.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.