CN213408249U

CN213408249U - Accurate ammonia device that spouts of thermal power plant deNOx systems

Info

Publication number: CN213408249U
Application number: CN202021960214.0U
Authority: CN
Inventors: 郗来鹏; 杨慧
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2021-06-11
Anticipated expiration: 2030-09-09

Abstract

The utility model discloses an accurate ammonia device that spouts of thermal power plant deNOx systems, including the denitrification facility body, denitrification facility body one side is equipped with the empty blender of ammonia, empty blender one side of ammonia is equipped with compressed air purge system, the inside ammonia injection grid lateral conduit that is equipped with of denitrification facility body, ammonia injection grid lateral conduit upper end fixed surface is equipped with a plurality of hand-operated valve, hand-operated valve one side is equipped with the ammonia injection electric control door every 2 ~ 3 lateral conduits of ammonia injection grid lateral conduit upper end entry set up an entry gas measurement device, ammonia grid lateral conduit is downThe end outlet is connected with a plurality of outlet gas measuring devices. Each subarea is additionally provided with a pneumatic adjusting door and a flowmeter according to the NO at the inlet and the outlet of the SCR_×/O₂The online real-time detection value realizes the remote adjustment of the ammonia spraying amount of each subarea, realizes the accurate ammonia spraying according to the requirement and improves the ammonia utilization rate.

Description

Accurate ammonia device that spouts of thermal power plant deNOx systems

Technical Field

The utility model belongs to the technical field of the flue gas denitration technique and specifically relates to a accurate ammonia device that spouts of thermal power plant deNOx systems is related to.

Background

The urea hydrolysis preparation system and the denitration dilution fan system adopt a hot secondary air source introduced from an inlet of the dilution fan. Because the hot secondary air carries polluted smoke particles to enter the ammonia injection system, the boiler ammonia gas/air mixer and the ammonia injection grid nozzle are seriously blocked, the denitration ammonia injection is uneven, the ammonia escape rate is higher, and the safe and stable operation of the denitration system is seriously influenced. And the denitration SCR system of the thermal power plant is only debugged and tested when the unit is fully loaded, and the ammonia injection amount of each nozzle at the SCR inlet is determined. In the actual operation process, due to factors such as unit load fluctuation, coal quality change, furnace combustion fluctuation and the like, the flue gas velocity field is not uniform, the ammonia injection concentration is not uniformly distributed, the uniformity of NOx/NH3 and the ammonia nitrogen molar ratio are changed, and the ammonia amount required by each reaction area of the catalyst is changed. The ammonia injection amount of each nozzle is adjusted again, so that the ammonia injection amount is matched with the new unit working condition, but the monitoring of online parameters such as NOx, NH3 concentration and the like of each SCR region is lacked by operating personnel. In order to meet the standard of ultralow emission, the emission standard of NOx is often achieved by increasing the ammonia injection amount, and therefore, the problem of overlarge ammonia escape is inevitably caused.

Under the mode of peak regulation or AGC of the unit, because the load fluctuation is large, the up-to-standard emission of NOx is ensured only by adopting excessive ammonia spraying, so that the phenomena of serious dust accumulation, blockage, abrasion and the like of a catalyst body are also generated, the denitration efficiency is reduced, the service life of the catalyst is shortened, the cold end of an air preheater is frequently blocked and the like, and the economic efficiency and the environmental protection benefit of the thermal power unit are influenced. In the SCR flue gas denitration process, the control of the ammonia escape rate is crucial. Often because control is not in place, easily cause the ammonia escape rate too high, the denitration cost increases, and unit safe operation also receives the threat moreover, and its harmfulness mainly shows in following several respects: poisoning of the catalyst; the heat exchange surfaces of a boiler tail flue and an air preheater are corroded, deposited with dust and blocked; increase of energy consumption: the differential pressure of the air preheater is increased, the output of a fan is increased, and the plant power consumption rate is increased; the heat exchange efficiency of the air preheater is influenced, the temperature of the exhaust smoke is increased, and the boiler efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome current defect, provide an accurate ammonia device that spouts of thermal power plant deNOx systems to solve above-mentioned problem.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an accurate ammonia device that spouts of thermal power plant deNOx systems, includes the denitrification facility body, denitrification facility body one side is equipped with the empty blender of ammonia, empty blender one side of ammonia is equipped with compressed air purge system, denitrification facility body is inside to be equipped with a plurality of and to spout ammonia grid lateral conduit, it is equipped with a plurality of hand-operated valve to spout ammonia grid lateral conduit upper end fixed surface, hand-operated valve one side is equipped with spouts ammonia electrically operated control door, it sets up an entry gas measuring device to spout every 2 ~ 3 lateral conduits of ammonia grid lateral conduit upper end entry, ammonia grid lateral conduit lower extreme exit linkage is equipped with a plurality of export gas measuring device.

As a preferred technical scheme of the utility model, entry gas measuring device and export gas measuring device all with original position formula data acquisition instrument input electric connection, original position formula data acquisition instrument output and alarm electric connection.

As an optimized technical scheme of the utility model, empty blender of ammonia and compressed air purge system all are connected through pipeline and ammonia injection grid branch pipeline.

As an optimized technical scheme of the utility model, ammonia injection grid lateral conduit entry sets up a measurement station, and the export sets up a measurement station, and entry gas measuring device is entry NOx measuring device, and export gas measuring device is including exporting NH₃A measuring device and a NOx measuring device. Now, each subarea is additionally provided with a pneumatic adjusting door and a flowmeter according to NO at the inlet and the outlet of the SCR_×/O₂And the online real-time detection value is used for realizing the remote adjustment of the ammonia spraying amount of each subarea. The main regulation of control is different from the traditional ammonia supply output quantity, the given ammonia supply value of the auxiliary regulation is obtained after the main regulation output data and the related data collected by the controller are operated, the given value of the auxiliary regulation is an ammonia supply flow regulation signal, the influence of the flow characteristic of the on-site regulation valve on the regulation performance is eliminated, and the dynamic ammonia nitrogen molar ratio control is realized.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the accurate ammonia spraying device for the thermal power plant denitration system realizes accurate ammonia spraying according to needs, improves the ammonia utilization rate, reduces the ammonia escape amount, and saves the cost of ammonia by about 39 ten thousand yuan per year;

2. the formation of ammonium bisulfate is effectively reduced, the pressure resistance of the continuous unit is prevented from being increased due to the blockage of an air preheater, the power consumption of an induced draft fan can be effectively reduced, and the electricity saving cost of the induced draft fan is about 52.5 ten thousand yuan/year;

3. the effective mixing of ammonia and nitrogen is promoted, the effective utilization level of the catalyst is improved, and the inactivation time of the catalyst layer is prolonged; the inactivation and blockage of the catalyst caused by the corrosion of ammonium bisulfate are reduced, the service life of the catalyst under the condition of ultralow emission can be prolonged by more than 10 percent, and about 6.5 ten thousand yuan can be saved each year when one layer of the catalyst is normally replaced every 3 years;

4. other indirect benefits include avoiding the unplanned shutdown loss caused by forced shutdown due to serious blockage of the air preheater, reducing the absorption amount of ammonium bisulfate in the fly ash to improve the quality of the fly ash, providing a good foundation for wide-load denitration and zero discharge of wastewater, and the like, and effectively ensuring the environmental protection and social benefits brought by stable standard discharge of the unit by obviously improving the utilization rate of ammonia and reducing the escape amount of ammonia;

5. the single 660MW unit can realize the benefit of 98 ten thousand yuan per year, the 2 x 660MW unit can realize the economic benefit of about 196 ten thousand yuan per year, in addition, the obvious environmental protection and social benefit can be realized, the structure is scientific and reasonable, the use is safe and convenient, and great help is provided for people.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is the utility model relates to an accurate ammonia device structure schematic diagram that spouts of thermal power plant deNOx systems.

In the figure: 1. an ammonia-air mixer; 2. a compressed air purge system; 3. branch pipelines of the ammonia injection grid; 4. an outlet gas measurement device; 5. an alarm; 6. an in-situ data acquisition instrument; 7. an inlet gas measurement device; 8. a manual valve; 9. an ammonia injection electric regulating valve; 10. denitration device body.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

Referring to fig. 1, the present invention provides a technical solution: the utility model provides an accurate ammonia device that spouts of thermal power plant deNOx systems, including denitrification facility body 10, denitrification facility body 10 one side is equipped with empty blender 1 of ammonia, 1 one side of empty blender of ammonia is equipped with compressed air purge system 2, denitrification facility body 10 is inside to be equipped with a plurality of and to spout ammonia grid lateral conduit 3, it is equipped with a plurality of manual valve 8 to spout 3 upper end fixed surfaces of ammonia grid lateral conduit, 8 one side of manual valve is equipped with and spouts ammonia electrically operated governor door 9, it sets up an entry gas measuring device 7 to spout every 2 ~ 3 lateral conduits of 3 upper end entries of ammonia grid lateral conduit, 3 lower extreme exit linkage in ammonia grid lateral conduit is equipped with a plurality of export gas measuring device 4.

The utility model discloses, preferred, entry gas measuring device 7 and export gas measuring device 4 all with 6 input electric connection of primary formula data acquisition instrument, 6 output of primary formula data acquisition instrument and 5 electric connection of alarm.

The utility model discloses, preferred, empty blender 1 of ammonia and compressed air purge system 2 all are connected with ammonia injection grid lateral conduit 3 through the pipeline.

The utility model discloses, preferred, 3 entrys of ammonia injection grid lateral conduit set up 5 ~ 7 measurement stations, and the export sets up 5 ~ 7 measurement stations, and entry gas measuring device 7 is entry NOx measuring device, and export gas measuring device 4 is including export NH3 measuring device and NOx measuring device.

The specific principle is as follows: when the device is used, according to the actual working condition of a power plant, 5-7 measuring points are arranged at the inlet of a single reactor, 5-7 measuring points are arranged at the outlet of the single reactor, 5 inlet NOx measuring devices, 5 outlet NH3 measuring devices and NOx measuring devices are arranged in all areas, the outlet measuring points are used for detecting according to partitions in one-to-one correspondence, the measuring points are mutually independent and synchronously measure and output data in real time, the device is different from the traditional single-point or round-trip extraction detection mode, the response time of the device is less than 3s, the back-blowing data of sampling pipelines of the measuring points are not kept for more than 10s, the data acquisition sensor is directly arranged on a flue, real-time and accurate data are provided for adjustment of the partitions, and once the data are abnormal, the alarm (5) is controlled by the in-.

2. The ammonia air mixer 1 and the compressed air purging system 2 send mixed flue gas into the ammonia injection grid branch pipeline 3 for denitration, the existing single unit SCR is respectively designed into 14 subareas, only controlled by a manual valve 8 and incapable of being remotely adjusted according to actual working conditions, and each area is provided with an ammonia injection electric adjusting door 9 for controlling the area to inject ammonia for adjustment. 5-7 areas are provided with 5-7 ammonia injection electric adjusting doors 9, and remote adjustment of ammonia injection amount of each subarea is realized according to online real-time detection values of NOx/O2 at SCR inlet and outlet.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides an accurate ammonia device that spouts of thermal power plant deNOx systems, includes denitrification facility body (10), its characterized in that, denitrification facility body (10) one side is equipped with empty blender (1) of ammonia, empty blender (1) one side of ammonia is equipped with compressed air purge system (2), denitrification facility body (10) inside is equipped with a plurality of and spouts ammonia grid lateral conduit (3), it is equipped with a plurality of hand-operated valve (8) to spout ammonia grid lateral conduit (3) upper end fixed surface, hand-operated valve (8) one side is equipped with spouts ammonia electric control door (9), it sets up an entry gas measuring device (7) to spout every 2 ~ 3 lateral conduits of ammonia grid lateral conduit (3) upper end entry, ammonia grid lateral conduit (3) lower extreme exit linkage is equipped with a plurality of export gas measuring device (4).

2. The accurate ammonia injection device of thermal power plant deNOx systems of claim 1, characterized in that: the inlet gas measuring device (7) and the outlet gas measuring device (4) are electrically connected with the input end of the in-situ data acquisition instrument (6), and the output end of the in-situ data acquisition instrument (6) is electrically connected with the alarm (5).

3. The accurate ammonia injection device of thermal power plant deNOx systems of claim 1, characterized in that: the ammonia-air mixer (1) and the compressed air purging system (2) are connected with the ammonia spraying grid branch pipeline (3) through pipelines.

4. The accurate ammonia injection device of thermal power plant deNOx systems of claim 1, characterized in that: the ammonia injection grid branch pipeline (3) is provided with 5-7 measuring points at the inlet, 5-7 measuring points at the outlet, the inlet gas measuring device (7) is an inlet NOx measuring device, and the outlet gas measuring device (4) comprises an outlet NH3 measuring device and a NOx measuring device.