Gas Sampling and Management System

• US 20160238494A1
• Filed: 02/17/2016
• Published: 08/18/2016
• Est. Priority Date: 02/17/2015
• Status: Active Grant

• Current Assignee: Chrintec, LLC
• Original Assignee: Chrintec, LLC
• Inventors: Chrin, Gregory R. II
• Granted Patent: US 9,677,976 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01N 1/2247 Sampling from a flowing stream of gas
• CPC Class Codes: G01N 1/2273 Atmospheric sampling
• CPC Class Codes: G01N 1/2294 Sampling soil gases or the like
• CPC Class Codes: G01N 33/0036 Specially adapted to detect a particular component all the other sub-groups of G01N33/0004 take precedence
• CPC Class Codes: G01N 33/0062 concerning the measuring method, e.g. intermittent, or the display, e.g. digital
• CPC Class Codes: G01N 33/0073 Control unit therefor
• CPC Class Codes: G05D 7/0635 by action on throttling means G05D7/0688, G05D7/0694 take precedence
• CPC Class Codes: Y02W 30/30 Landfill technologies aiming to mitigate methane emissions

Abstract

A gas monitoring and control system including a gas sampling chamber, sampling inlet and outlet valves, a pump and a controller. Sensors are disposed within the interior chamber that sense characteristics of a gas from a gas source and generate representative signals. The sampling inlet and outlet valves i) allow the gas into the gas sampling chamber while operating in a gas sampling state, and ii) allow ambient air into the gas sampling chamber while operating in a purge state. The pump i) causes the gas to flow through the gas sampling chamber while operating in the gas sampling state or ii) causes ambient air to flow through the gas sampling chamber while operating in the purge state. The controller causes the sampling inlet and outlet valves, and the pump to alternate operating in the gas sampling or purge state to selectively expose the sensors to the gas.

Claims

1. A gas monitoring and control system comprising:

a gas sampling chamber having a chamber inlet, a chamber outlet and an interior chamber;

one or more sensors disposed within the interior chamber, the sensors being operable to sense one or more characteristics of a gas from a gas source and generate one or more sensor signals representative of the one or more characteristics of the gas;

a sampling inlet valve in operable communication with an outlet of the gas source and the chamber inlet;

a sampling outlet valve in operable communication with the chamber outlet and an inlet of the gas source, the sampling inlet valve and the sampling outlet valve operable to i) allow the gas from the gas source to enter the gas sampling chamber while operating in a gas sampling state, and ii) allow ambient air to enter the gas sampling chamber while operating in a purge state,

a pump in operable communication with the sampling inlet valve and the sampling outlet valve, the pump operable to i) cause the gas to flow through the gas sampling chamber while operating in the gas sampling state and ii) cause ambient air to flow through the gas sampling chamber while operating in the purge state; and

a controller in operable communication with the one or more sensors, the sampling inlet valve, the sampling outlet valve and the pump, the controller operable to cause the sampling inlet valve, the sampling outlet valve and the pump to alternate operating in the gas sampling state during a sampling time period and the purge state during a purge time period to selectively expose the one or more sensors to the gas.

2. The gas monitoring and control system of claim 1, wherein the sampling time period is less than 2 minutes.

3. The gas monitoring and control system of claim 1, wherein a time interval between subsequent sampling time periods is greater than 1 hour.

4. The gas monitoring and control system of claim 1, wherein the sampling inlet valve and the sampling outlet valve are operable to facilitate creating a static pressure in the gas sampling chamber while operating in a vacuum pressure state;

and wherein the controller is operable to cause the sampling inlet valve and the sampling outlet valve to each operate in the vacuum pressure state during a vacuum pressure time period.

5. The gas monitoring and control system of claim 1, wherein the sampling inlet valve and the sampling outlet valve are operable to isolate the gas sampling chamber from the gas while operating in an isolation state;

and wherein the controller is operable to cause the sampling inlet valve and the sampling outlet valve to each operate in the isolation state during an isolation time period.

6. The gas monitoring and control system of claim 1, wherein the purge time period is less than 2 minutes.

7. The gas monitoring and control system of claim 1, wherein the controller is operable to cause the sampling inlet valve, the sampling outlet valve and the pump to operate in the gas sampling state in response to receiving a sampling command from an external computing device to sample the gas.

8. The gas monitoring and control system of claim 1, further comprising

a valve actuator in operable communication with a gas source valve in the gas source;

and wherein the controller is in operable communication with the valve actuator and operable to cause the valve actuator to transition the gas source valve towards an open position or a closed position when the one or more sensor signals meets valve actuation criteria to regulate the flow of the gas in the gas source.

9. The gas monitoring and control system of claim 8, wherein the one or more sensor signals includes a sensor signal representative of oxygen concentration of the gas.

10. The gas monitoring and control system of claim 8, wherein the one or more sensor signals meets valve actuation criteria when the one or more sensor signals exceeds a concentration threshold;

and wherein the controller causes the valve actuator to transition the gas source valve towards the closed position when the one or more sensor signals exceeds the concentration threshold.

11. The gas monitoring and control system of claim 8, wherein the one or more sensor signals meets valve actuation criteria when the one or more sensor signals falls below a concentration threshold;

and wherein the controller causes the valve actuator to transition the gas source valve towards the open position when the one or more sensor signals falls below the concentration threshold.

12. The gas monitoring and control system of claim 8 wherein the one or more sensor signals meets valve actuation criteria when a positive rate of change of the one or more sensor signals exceeds a concentration change rate threshold;

and wherein the controller causes the valve actuator to transition the gas source valve towards the closed position when the positive rate of change of the one or more sensor signals exceeds the concentration change rate threshold.

13. The gas monitoring and control system of claim 8 wherein the one or more sensor signals meets valve actuation criteria when a negative rate of change of the one or more sensor signals exceeds a concentration change rate threshold;

and wherein the controller causes the valve actuator to transition the gas source valve towards the open position when the negative rate of change of the one or more sensor signals exceeds the concentration change rate threshold.

14. The gas monitoring and control system of claim 8, wherein the controller is operable to cause the valve actuator to transition the gas source valve towards the open position or the closed position when a second set of one or more sensor signals sampled at a second gas source meets a second valve actuation criteria.

15. The gas monitoring and control system of claim 14, wherein the second set of one or more sensor signals meets the second valve actuation criteria when the second set of one or more sensor signals is less than the one or more sensor signals;

and wherein the controller is operable to cause the valve actuator to transition the gas source valve towards the open position when the second set of one or more sensor signals is less than the one or more sensor signals.

16. The gas monitoring and control system of claim 14, wherein the second set of one or more sensor signals meets the second valve actuation criteria when the second set of one or more sensor signals is greater than the one or more sensor signals;

and wherein the controller is operable to cause the valve actuator to transition the gas source valve towards the closed position when the second set of one or more sensor signals is greater than the one or more sensor signals.