阅读说明：本技术 一种scr催化剂层堵灰及磨损在线监测系统 (SCR catalyst layer ash blockage and abrasion on-line monitoring system ) 是由 潘栋 李淑宏 杨世极 徐晓涛 舒凯 袁壮 董陈 罗志 尚桐 杨晓刚 石磊 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种SCR催化剂层堵灰及磨损在线监测系统,包括计算机；脱硝反应器内SCR催化剂层上侧及下侧均按照网格法布置若干测点,其中,SCR催化剂层上侧的一个测点正对SCR催化剂层下侧的一个测点,各测点处均设置有静压取样管及全压取样管,其中,静压取样管及全压取样管均连接有压力变送器,其中,各压力变送器的输出端与计算机相连接,该系统能够在线判断SCR催化剂层是否发生积灰或者磨损。(The invention discloses an SCR catalyst layer ash blockage and abrasion on-line monitoring system, which comprises a computer; the upper side and the lower side of an SCR catalyst layer in the denitration reactor are respectively provided with a plurality of measuring points according to a grid method, wherein one measuring point on the upper side of the SCR catalyst layer is over against one measuring point on the lower side of the SCR catalyst layer, each measuring point is provided with a static pressure sampling tube and a full pressure sampling tube, the static pressure sampling tubes and the full pressure sampling tubes are respectively connected with a pressure transmitter, the output end of each pressure transmitter is connected with a computer, and the system can judge whether the SCR catalyst layer is subjected to dust deposition or abrasion on line.)

1. An SCR catalyst layer ash blockage and abrasion on-line monitoring system is characterized by comprising a computer (6);

the upper side and the lower side of an SCR catalyst layer (1) in a denitration reactor (10) are respectively provided with a plurality of measuring points (2) according to a grid method, wherein one measuring point (2) on the upper side of the SCR catalyst layer (1) is over against one measuring point (2) on the lower side of the SCR catalyst layer, each measuring point (2) is provided with a static pressure sampling tube and a full pressure sampling tube, the static pressure sampling tube and the full pressure sampling tube are respectively connected with a pressure transmitter (5), and the output end of each pressure transmitter (5) is connected with a computer (6).

2. The system for monitoring the ash blockage and wear of the SCR catalyst layer according to claim 1, wherein the output end of each pressure transmitter (5) is connected with the computer (6) through a digital signal multipoint sampling module (9).

3. The SCR catalyst layer ash blockage and wear online monitoring system according to claim 2, wherein the digital signal multipoint sampling module (9) is connected with the computer (6) and the pressure transmitter (5) through the transmission cable (3).

4. The SCR catalyst layer ash blockage and abrasion online monitoring system according to claim 1, further comprising a purging fan (7), wherein an outlet of the purging fan (7) is communicated with a purging gas inlet of the static pressure sampling pipe and a purging gas inlet of the full pressure sampling pipe.

5. The SCR catalyst layer ash blockage and abrasion on-line monitoring system according to claim 4, wherein an outlet of the purging fan (7) is communicated with a purging gas inlet of the static pressure sampling pipe and a purging gas inlet of the full pressure sampling pipe through a purging bypass (8).

6. The SCR catalyst layer ash blockage and abrasion online monitoring system according to claim 1, wherein the static pressure sampling tube and the full pressure sampling tube are both provided with electromagnetic valves (4), and the electromagnetic valves (4) are connected with the computer (6).

7. The SCR catalyst layer ash blockage and wear online monitoring system of claim 1, wherein a display is connected to the computer (6).

8. The SCR catalyst layer ash blockage and abrasion on-line monitoring system according to claim 1, wherein the computer (6) is connected with an alarm.

9. The SCR catalyst layer ash blockage and abrasion online monitoring system according to claim 1, wherein when the difference value of the static pressure signals at two upper and lower opposite measuring points (2) is greater than a preset static pressure value and the difference value of the full pressure signals at the upper and lower opposite measuring points (2) is greater than the highest preset full pressure value, ash blockage occurs at the position, opposite to the two measuring points (2), on the SCR catalyst layer (1).

10. The SCR catalyst layer ash blockage and abrasion online monitoring system according to claim 1, wherein when the difference value of the full pressure signals at the two upper and lower opposite measuring points (2) is less than the minimum preset full pressure value, the SCR catalyst layer is proved to be abraded at the positions opposite to the two measuring points (2).

Technical Field

The invention belongs to the field of catalyst state monitoring, and relates to an SCR catalyst layer ash blocking and abrasion online monitoring system.

Background

Most of the existing thermal power generating units in China basically adopt an SCR (selective catalytic reduction) process to remove nitrogen oxides in flue gas, and the core equipment of the process is an SCR catalyst arranged in a reactor. In the long-time operation process of the thermal power generating unit, the abrasion and dust deposition of the catalyst layer often occur due to the large dust content of the flue gas. At present, no on-line monitoring method is available for the dust deposition or abrasion state of the catalyst, and only after the unit is shut down, a manhole door is opened, and the catalyst layer is inspected in a manual inspection mode. If the slight wearing and tearing of catalyst or deposition appear in service like this, the operation personnel then can't in time discover and take measures to handle, lead to the aggravation of later stage wearing and tearing or the deposition condition, cause serious damage to the catalyst, and then influence the safe operation of unit and nitrogen oxide environmental protection index's discharge to reach standard.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an SCR catalyst layer ash blocking and abrasion online monitoring system which can judge whether the SCR catalyst layer is ash-deposited or abraded on line.

In order to achieve the aim, the SCR catalyst layer ash blockage and abrasion online monitoring system comprises a computer;

the upper side and the lower side of an SCR catalyst layer in the denitration reactor are respectively provided with a plurality of measuring points according to a grid method, wherein one measuring point on the upper side of the SCR catalyst layer is over against one measuring point on the lower side of the SCR catalyst layer, each measuring point is provided with a static pressure sampling tube and a full pressure sampling tube, the static pressure sampling tube and the full pressure sampling tube are both connected with pressure transmitters, and the output ends of the pressure transmitters are connected with a computer.

The output end of each pressure transmitter is connected with a computer through a digital signal multipoint sampling module.

The digital signal multipoint sampling module is connected with the computer and the pressure transmitter through transmission cables.

The device also comprises a purging fan, and an outlet of the purging fan is communicated with a purging gas inlet of the static pressure sampling tube and a purging gas inlet of the full pressure sampling tube.

And the outlet of the purging fan is communicated with the purging gas inlet of the static pressure sampling pipe and the purging gas inlet of the full pressure sampling pipe through a purging bypass.

The static pressure sampling tube and the full pressure sampling tube are both provided with electromagnetic valves which are connected with a computer.

The computer is connected with a display.

The computer is connected with an alarm.

And when the difference value of the static pressure signals at the two upper and lower opposite measuring points is greater than a preset static pressure value and the difference value of the full pressure signals at the upper and lower opposite measuring points is greater than the highest preset full pressure value, indicating that ash blockage occurs at the position opposite to the two measuring points on the SCR catalyst layer.

And when the difference value of the total pressure signals at the two upper and lower opposite measuring points is smaller than the minimum preset total pressure value, indicating that the positions, opposite to the two measuring points, on the SCR catalyst layer are worn.

The invention has the following beneficial effects:

when the SCR catalyst layer ash blockage and abrasion online monitoring system is in specific operation, a plurality of measuring points are arranged on the upper side and the lower side of the SCR catalyst layer by adopting a grid method, and whether each position of the SCR catalyst layer generates electricity, is abraded or blocked or not is judged by measuring static pressure signals and full pressure signals at each measuring point.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is an SCR catalyst layer, 2 is a measuring point, 3 is a transmission cable, 4 is an electromagnetic valve, 5 is a pressure transmitter, 6 is a computer, 7 is a purging fan, 8 is a purging bypass, 9 is a digital signal multi-point sampling module, and 10 is a denitration reactor.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions 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 a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1, the SCR catalyst layer ash blockage and abrasion online monitoring system according to the present invention includes a transmission cable 3, a digital signal multipoint sampling module 9, a computer 6, and a purge fan 7;

the upper side and the lower side of an SCR catalyst layer 1 in a denitration reactor 10 are respectively provided with a plurality of measuring points 2 according to a grid method, wherein one measuring point 2 on the upper side of the SCR catalyst layer 1 is over against one measuring point 2 on the lower side of the SCR catalyst layer, each measuring point 2 is provided with a static pressure sampling pipe and a full pressure sampling pipe, the static pressure sampling pipe and the full pressure sampling pipe are respectively connected with a pressure transmitter 5, the output end of each pressure transmitter 5 is connected with a digital signal multi-point sampling module 9 through a transmission cable 3, the output end of the digital signal multi-point sampling module 9 is connected with a computer 6, and the outlet of a purging fan 7 is communicated with a purging gas inlet of the static pressure sampling pipe and a purging gas inlet of the full pressure sampling pipe through a purging bypass 8.

The static pressure sampling tube and the full pressure sampling tube are provided with electromagnetic valves 4, wherein the electromagnetic valves 4 are connected with a computer, when the measurement is started, all the electromagnetic valves 4 are opened, the static pressure sampling and the full pressure sampling are carried out on the measuring points 2 through the static pressure sampling tube and the full pressure sampling tube, then the static pressure signal and the full pressure signal at the measuring points 2 are measured through a pressure transmitter 5, the static pressure signal and the full pressure signal are input into a computer 6 through a digital signal multipoint sampling module 9, the computer 6 judges whether the SCR catalyst layer 1 is ash-blocked or abraded according to the static pressure signal and the full pressure signal at each measuring point 2, when the ash-blocked or abraded occurs, an alarm is controlled to give an alarm, and meanwhile, a display is used for displaying the static pressure value and the full pressure value at each measuring point 2 in real time.

When the difference value of the static pressure signals at the two upper and lower opposite measuring points 2 is greater than a preset static pressure value and the difference value of the full pressure signals at the upper and lower opposite measuring points 2 is greater than the highest preset full pressure value, indicating that ash blockage occurs at the positions, opposite to the two measuring points 2, on the SCR catalyst layer 1; when the difference value of the total pressure signals at the two upper and lower opposite measuring points 2 is smaller than the minimum preset total pressure value, the situation that the positions, opposite to the two measuring points 2, on the SCR catalyst layer are abraded is indicated.

The purge fan 7 is periodically started to purge each of the static pressure sampling tube and the full pressure sampling tube by the purge fan 7, thereby removing the soot accumulated in the static pressure sampling tube and the dynamic pressure sampling tube.