SYSTEMS AND METHODS FOR DETECTING THE STATUS OF AN ELECTROSTATIC FILTER
Presented is an air cleaning system, comprising: an electrostatic precipitation air filter comprising a collector electrode, a repeller electrode and a corona wire; a detection system for detecting particles; characterized in that: the detection system is configured to determine a status of the electrostatic precipitation filter from an amount of particles present on the collector electrode. Further presented are methods for determining a status of an electrostatic precipitation air filter and methods for determining a particle size distribution in air.
1 . An air cleaning system, comprising:
an electrostatic precipitation air filter comprising a collector electrode, a repeller electrode and a corona wire; and
a detection system for detecting particles; wherein the detection system is configured to determine a status of the electrostatic precipitation filter from an amount of particles present on the collector electrode; and wherein the detection system comprises:
an actuating component configured for actuating the collector electrode such that present particles on the collector electrode are detached from the collector electrode when activated;
a detector configured to determine the amount of particles present on the collector electrode from detached collector electrode particles in air.
2 . The air cleaning system according to claim 1 ,
wherein the detection system is configured to:
switch off the corona wire voltage, the collector electrode voltage and the repeller electrode voltage; thereafter
activate the actuating component to detach particles from the collector electrode; thereafter
optically detect the amount of the detached particles.
3 . The air cleaning system according to claim 1 ,
wherein the detection system is configured to:
switch off the corona wire voltage and maintain the collector electrode voltage and the repeller electrode voltage; thereafter
activate the actuating component to detach particles from the collector electrode; thereafter
analyze the collector electrode current signal to determine the amount of the detached particles.
4 . The air cleaning system according to claim 3 , wherein the detection system is further configured to determine particle size distribution of the detached particles by relating different current pulses of the collector electrode current signal over time to different particle sizes.
5 . The air cleaning system according to claim 1 ,
wherein the detection system is configured to:
switch off the corona wire voltage, switch off the collector electrode voltage and switch off the repeller electrode voltage; thereafter
activate the actuating component to detach particles from the collector electrode; thereafter
supply the collector electrode with the repeller electrode voltage before switch-off and supplying the repeller electrodes with the collector electrode voltage before switch-off, and
analyze the repeller electrode current signal to determine the amount of the detached particles.
6 . The air cleaning system according to claim 5 , wherein the detection system is further configured to determine particle size distribution of the detached particles by relating different current pulses of the repellent electrode current signal over time to different particle sizes.
7 . A particle detector, comprising:
at least one collector electrode, at least one repeller electrode and at least one corona wire; and
a detection system comprising:
an actuating component configured for actuating the collector electrode such that present particles on the collector electrode are detached from the collector electrode when the actuating component is activated; and
a detector configured to determine the type of particles present on the collector electrode from detached collector electrode particles in air.
8 . The particle detector according to claim 7 , wherein the particle detector is a particle detector for detecting a particular type of particle; and wherein a magnitude of force exerted by the actuating component on the collector electrode is adapted to the particular type of particle.
9 . A method for determining a status of an electrostatic precipitation air filter comprising a collector electrode, a repeller electrode and a corona wire, the method comprising:
determining the status of the precipitation air filter by:
determining an amount of gathered particles on the collector electrode; and
determining the status of the electrostatic precipitation air filter based on the determined amount of gathered particles; and
wherein determining the amount of gathered particles present on the collector electrode comprises:
detaching the gathered particles from the collector electrode thereby forming an airborne particle cloud, and
determining the amount of particles in the particle cloud.
10 . The method according to claim 9 , further comprising:
switching off the corona wire voltage, the collector electrode voltage and the repeller electrode voltage prior to the detaching of the gathered particles from the collector electrode, and
wherein determining the amount of particles in the particle cloud is done by performing optical detection on the particle cloud.
11 . The method according to any of claim 9 , further comprising:
switching off the corona wire voltage and maintaining the collector electrode voltage and the repeller electrode voltage prior to the detaching of the gathered particles from the collector electrode, and
wherein the amount of particles in the particle cloud is determined from the collector electrode current signal.
12 . A method for determining particle size distribution, comprising the method according to claim 11 , and wherein the particle size distribution of detached particles is determined by relating different current pulses of the collector electrode current signal over time to different particle sizes.
13 . The method according to claim 9 , further comprising:
switching off the corona wire voltage, switching off the collector electrode voltage and switching off the repeller electrode voltage prior to the detaching of the gathered particles from the collector electrode, and
supplying the collector electrode with the repeller electrode voltage before switch-off and supplying the repeller electrode with the collector electrode before switch-off after the detaching of the gathered particles from the collector electrode, and
wherein the amount of particles in the particle cloud is determined from the repeller electrode current signal.
14 . A method for determining particle size distribution, comprising the method according to claim 13 , wherein the particle size distribution of detached particles is determined by relating different current pulses of the repellent electrode current signal over time to different particle sizes.