Multi-point laser ammonia escape online monitoring system

Abstract

The utility model discloses a multi-point laser ammonia escape online monitoring system, which comprises a multi-channel control cabinet and an in-situ laser ammonia escape analyzer, and the in-situ laser ammonia escape analyzer firstly performs high-temperature pretreatment on flue gas and then performs high-temperature measurement on the flue gas. The multi-channel control cabinet is electrically connected with the plurality of in-situ laser ammonia escape analyzers so as to control the plurality of in-situ laser ammonia escape analyzers to work, and the multi-channel control cabinet can simultaneously receive signals transmitted by the plurality of in-situ laser ammonia escape analyzers; instrument concentration signals and equipment states of the multiple paths of in-situ laser ammonia escape analyzers can be transmitted to the internet-of-things platform, the distribution condition of ammonia escape can be comprehensively and accurately known, and the device is mainly designed for the severe working condition environment of a power plant SCR denitration system. Compared with a traditional sampling and measuring system of the SCR denitration system, the sampling and measuring system has the four prominent characteristics of multi-point synchronous detection, comprehensive reaction of flue interface concentration distribution, difficulty in blockage and simplicity in maintenance.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas denitration technical field, concretely is a kind of multi-point laser ammonia escape on-line monitoring system. BACKGROUND

[0002] Excessive ammonia reacts with SO3 in flue gas to generate NH4HSO4, abbreviated as ABS. ABS is in liquid state within a certain temperature range and has viscous characteristics, easily adheres in heat exchange equipment, increases pressure loss, and seriously causes heat exchanger to be blocked, worn and corroded, endangering the safe operation of boiler.

[0003] Ammonia escape is directly related to denitration efficiency. As environmental protection departments gradually begin to pay attention to ammonia escape emission values, the accuracy of ammonia escape detection is particularly important. Ammonia escape instrument can provide real-time ammonia content data in flue gas, provide data support for preventing air preheater blockage, and help control ammonia escape to ensure NOx emission compliance.

[0004] The prior art mainly uses single-point or mixed sampling monitoring method to measure ammonia escape, and the effect of ammonia injection optimization of SCR is limited. Multi-point monitoring can comprehensively obtain the distribution of ammonia escape on the cross section of flue gas, provide scientific basis for optimizing ammonia injection control, so as to realize effective control and reduction of ammonia escape. UTILITY MODEL CONTENT

[0005] This part aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract of the specification and the utility model name to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] Therefore, the purpose of the utility model is to provide a multi-point laser ammonia escape on-line monitoring system to solve the problems of incomplete flue interface ammonia escape measurement, easy blockage, slow response time and difficult maintenance of existing ammonia escape measurement system.

[0007] To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical scheme:

[0008] A multi-point laser ammonia escape on-line monitoring system comprises a multi-channel control cabinet and an in-situ laser ammonia escape analyzer.

[0009] The in-situ laser ammonia escape analyzer first performs high-temperature pretreatment on flue gas and then performs high-temperature measurement.

[0010] The multi-channel control cabinet is electrically connected with the plurality of in-situ laser ammonia escape analyzers to control the working of the plurality of in-situ laser ammonia escape analyzers.

[0011] The multi-channel control cabinet can simultaneously receive signals transmitted by multiple in-situ laser ammonia escape analyzers, and can transmit the instrument concentration signals and equipment states of the multiple in-situ laser ammonia escape analyzers to an Internet of Things platform.

[0012] As a preferred scheme of the multi-point laser ammonia escape online monitoring system, the in-situ laser ammonia escape analyzer comprises:

[0013] The high-temperature pretreatment unit is used for pretreating flue gas and heating the flue gas as a whole to above 250 DEG C.

[0014] The laser ammonia escape analysis unit is used for high-temperature measurement of NH3 by using TDLAS technology.

[0015] As a preferred scheme of the multi-point laser ammonia escape online monitoring system, the in-situ laser ammonia escape analyzer further comprises an electromagnetic valve group unit, which is used for back blowing of the high-temperature pretreated flue gas and calibration of the instrument.

[0016] As a preferred scheme of the multi-point laser ammonia escape online monitoring system, the multi-channel control cabinet comprises:

[0017] The multi-channel signal processing unit is installed on an inner door panel of the multi-channel control cabinet, adopts a multi-channel RS485 signal processing module, and simultaneously receives RS485 signals transmitted by multiple in-situ laser ammonia escape analyzers.

[0018] The multi-channel valve control unit is installed on an electrical bottom plate of the multi-channel control cabinet, and simultaneously controls the electromagnetic valve group units of the multiple in-situ laser ammonia escape analyzers by using a PLC module.

[0019] The Internet of Things data transmission unit is installed on the inner door panel of the multi-channel control cabinet, and transmits the concentration signals and equipment states of the multiple in-situ laser ammonia escape analyzers to an Internet of Things platform.

[0020] Compared with the prior art, the utility model has the beneficial effects that the utility model can comprehensively and accurately understand the distribution of ammonia escape, mainly aims at the harsh working condition environment of the SCR denitration system of the power plant, and has four outstanding features of multi-point synchronous detection, comprehensive reaction of flue interface concentration distribution, non-blocking and simple maintenance compared with the traditional SCR denitration system sampling measurement system. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the present application will be described in detail below with reference to the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings. Among them:

[0022] Fig. 1 It is a whole structure schematic diagram of the multi-point laser ammonia escape online monitoring system of the present application.

[0023] Fig. 2 It is a structure schematic diagram of the multi-channel control cabinet provided by the present application.

[0024] Fig. 3 It is a structure schematic diagram of the in-situ laser ammonia escape analyzer provided by the present application. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0026] Secondly, the present application is described in detail in combination with the schematic diagram. In order to facilitate the description, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0027] In order to make the purposes, technical schemes and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0028] Please refer to Figs. 1-3 The present application provides a multi-point laser ammonia escape online monitoring system, which comprises a multi-channel control cabinet 100 and an in-situ laser ammonia escape analyzer 200. The in-situ laser ammonia escape analyzer 200 first performs high-temperature pretreatment on flue gas and then performs high-temperature measurement.

[0029] The multi-channel control cabinet 100 is electrically connected with a plurality of in-situ laser ammonia escape analyzers 200 to control the working of the plurality of in-situ laser ammonia escape analyzers 200.

[0030] Among them, the multi-channel control cabinet 100 can simultaneously receive signals transmitted by the plurality of in-situ laser ammonia escape analyzers 200, and can transmit the instrument concentration signals and equipment state of the plurality of in-situ laser ammonia escape analyzers 200 to the Internet of Things platform.

[0031] The utility model discloses a multi -channel control machine cabinet 100 to the signal collection of real -time of multichannel in -situ laser ammonia escape analyzer 200, can fully, accurate understanding ammonia escape's distribution, mainly for the design of the bad working condition environment of power plant SCR denitration system, relative traditional SCR denitration system sampling measurement system has four outstanding features of multipoint synchronous detection, comprehensive reaction flue interface concentration distribution, not easy to block, simple maintenance.

[0032] Specifically, in the embodiment, the multi-channel control cabinet 100 controls 1-8 in-situ laser ammonia escape analyzers 200 in real time, the multi-channel control cabinet 100 includes a multi-channel signal processing unit 110, a multi-channel valve control unit 120 and an Internet of Things data transmission unit 130, the multi-channel signal processing unit 110 is installed on the inner door panel of the multi-channel control cabinet, adopts a multi-channel RS485 signal processing module, and can receive 1-8 channel RS485 signals simultaneously; the multi-channel valve control unit 120 is installed on the electrical bottom plate of the multi-channel control cabinet, and can control 5-40 valves to work simultaneously through a PLC module; the Internet of Things data transmission unit 130 is installed on the inner door panel of the multi-channel control cabinet, can transmit the concentration signals and equipment states of 1-8 in-situ laser ammonia escape analyzers 200 to the Internet of Things platform, and users can remotely check the equipment running state at the PC and mobile phone APP end, so that the equipment is conveniently maintained on site.

[0033] The in-situ laser ammonia escape analyzer 200 includes a high-temperature pretreatment unit 210, a laser ammonia escape analysis unit 220 and a solenoid valve group unit 230, the high-temperature pretreatment unit 210 heats the whole pretreatment to above 250 DEG C, adopts a low-thermal-conductivity heat preservation material to prevent heat loss, flue gas enters the ammonia escape analyzer after high-temperature pretreatment, high-temperature measurement is conducted on the flue gas, the sampling pipeline is prevented from being blocked due to ammonium salt crystallization, the high-temperature original sampling measurement mode greatly reduces the response time of the device to flue gas, the laser ammonia escape analysis unit 220 adopts mature TDLAS technology to measure NH3, and has strong anti-interference capability; the solenoid valve group unit 230 can effectively blow back the high-temperature pretreatment and calibrate the instrument, the utility model can fully and accurately understand the distribution of ammonia escape, and provides a scientific basis for optimizing the ammonia injection control of the SCR selective catalytic reduction system. Through real-time monitoring of the ammonia escape concentration, enterprises can timely understand the ammonia escape condition in the production process, optimize the ammonia injection control, reduce the operation cost, and improve the production efficiency.

[0034] Although the utility model has been described above with reference to the embodiments, various modifications can be made thereto, and equivalent replacements can be made to the components thereof, without departing from the scope of the utility model. In particular, as long as there is no structural conflict, each feature in the embodiments disclosed by the utility model can be combined with each other in any manner, and the combinations are not exhaustively described in the specification merely for the purpose of omitting the length and saving the resources. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multi-point laser ammonia escape online monitoring system, characterized in that: include: A multi-channel control cabinet (100) and an in-situ laser ammonia escape analyzer (200); The in-situ laser ammonia escape analyzer (200) performs high-temperature pretreatment on the flue gas before performing high-temperature measurement; The multi-channel control cabinet (100) is electrically connected to a plurality of in-situ laser ammonia escape analyzers (200) to control the operation of the plurality of in-situ laser ammonia escape analyzers (200); The multi-channel control cabinet (100) can simultaneously receive signals transmitted by multiple in-situ laser ammonia escape analyzers (200), and can transmit the instrument concentration signals and device status of the multiple in-situ laser ammonia escape analyzers (200) to the Internet of Things platform.

2. A multi-point laser ammonia escape online monitoring system according to claim 1, characterized in that: The in-situ laser ammonia escape analyzer (200) comprises: A high-temperature pretreatment unit (210) is used to pretreat the flue gas and heat the flue gas as a whole to above 250°C; The laser ammonia escape analysis unit (220) uses TDLAS technology to perform high-temperature measurement of NH3.

3. A multi-point laser ammonia escape online monitoring system according to claim 2, characterized in that: The in-situ laser ammonia escape analyzer (200) further comprises a solenoid valve assembly unit (230), wherein the solenoid valve assembly unit (230) is used for back-flushing the high-temperature pretreated flue gas and calibrating the instrument.

4. The multi-point laser ammonia escape online monitoring system according to claim 1, characterized in that: The multi-channel control cabinet (100) comprises: A multi-channel signal processing unit (110) is installed on the inner door panel of the multi-channel control cabinet (100), adopts a multi-channel RS485 signal processing module, and simultaneously receives RS485 signals transmitted by multiple in-situ laser ammonia escape analyzers (200); A multi-channel valve control unit (120) is installed on the electrical base plate of the multi-channel control cabinet (100) and controls the operation of multiple electromagnetic valve group units (230) of the in-situ laser ammonia escape analyzer (200) through a PLC module; The Internet of Things data transmission unit (130) is installed on the inner door panel of the multi-channel control cabinet (100) and transmits the concentration signals and device status of the multiple in-situ laser ammonia escape analyzers (200) to the Internet of Things platform.

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