KR100250320B1 - Vapor gas treatment and method - Google Patents

Abstract

PURPOSE: A processing device and a method for evaporated gas are provided to completely burn evaporated gas not processed by an evaporated gas processor through operating an internal combustion apparatus when a large amount of evaporated gas is generated. CONSTITUTION: In case a predetermined pressure is formed in a fuel tank by evaporated gas, a fuel check valve(130) is operated for collecting the evaporated gas in a canister(120). The evaporated gas is sucked to an engine by a purge valve(110) for being burned. In case of not operating the engine, a piston(310) of a pressure valve(300) is operated for sucking the evaporated gas in a combustion container(210). The piston pushes a contact point switch(330) for operating a heater(220). Thus, the evaporated gas in the combustion container is burned. By increase of temperature in the container, a temperature sensor(230) is operated to drive a relay(160). The relay opens the heater from a battery(140). Therefore, the gas burned in the combustion container is purified by catalysis(240) for being discharged to outside.

Description

Evaporative gas treatment device and method

The present invention relates to an apparatus for treating boil-off gas, and in more detail, a combustion apparatus is provided in the boil-off gas circulation system because it is difficult to process itself due to the generation of boil-off gas due to high atmospheric temperature and low air pressure in high temperature and high regions. The present invention relates to an evaporative gas treatment apparatus and method for satisfying the exhaust gas regulation by treating all the evaporated gases.

Theoretical air-fuel ratio is the ratio of air and fuel, and the least harmful component of exhaust gas is the smallest when the ratio of air and fuel is 14.7: 1.

In the three-way catalyst, if the air-fuel ratio is out of the theoretical air-fuel ratio, the CO, HC, and NOx purification capacity of the three-way catalyst decreases.

Therefore, the air-fuel ratio is measured by the oxygen concentration in the exhaust of the exhaust pipe, and a negative feed back signal is sent to the fuel supply device to control the air-fuel ratio by collecting the theoretical values.

In other words, as the industry is highly developed in modern times, the interest on the environment is heightened, and regulations on automobile exhaust gas are strictly observed in order to prevent air pollution by automobile exhaust gas.

Non-combustion emissions from cars include blow-by gas from the engine's crankcase and fuel evaporation gas evaporating from the fuel tank or carburetor.

As a countermeasure against the boil-off gas, the boil-off gas collected in the canister is fed back by using a purge valve and burned.

Therefore, the purge valve must be checked for failure so that the evaporated gas can be effectively burned for the air-fuel ratio.

As shown in the accompanying Figure 1, the configuration and operation of a conventional boil-off gas treatment apparatus is as follows.

A fuel check valve 30 for staying in the fuel tank until the boil-off gas reaches a predetermined pressure; A canister 20 for collecting gas generated from a fuel tank storing chemical energy for powering an automobile; It consists of a purge valve 10 to suck the fuel collected in the canister 20 into the engine.

When the gasoline gas evaporated from the fuel tank reaches a constant pressure, the fuel check valve 30 is opened, and the boil-off gas is collected in the canister 20.

The boil-off gas collected in the canister 20 is purged by the purge valve 10 to be burned into the engine.

In other words, the evaporated gas evaporated in the fuel tank has harmful components, and the evaporated gas is stored in the canister 20 and then burned and discharged from the engine.

However, the conventional boil-off gas treatment device has a high atmospheric temperature in a high temperature region and a high region, and has a low atmospheric pressure and generates a large amount of fuel boil-off gas. There is a problem in that the gas is released into the atmosphere and the environmental pollution and exhaust gas regulations.

Accordingly, an object of the present invention is to solve the above problems, and it is determined whether a large amount of evaporated gas is generated, such as a high temperature and a high region, when a flat and wound evaporated gas is generated. If a large amount is generated, the internal combustion device is operated to completely burn the excess evaporated gas that the evaporative gas treatment device has not handled, thereby preventing the environmental pollution or controlling the emission gas. An apparatus and a method thereof are provided.

As a means for achieving the above object, the configuration of the present invention comprises: a fuel check valve for staying in the fuel tank until the boil-off gas is a constant pressure in the fuel tank for storing chemical energy for powering the automobile; A canister for collecting vaporized evaporated gas from the fuel in the fuel tank; A purge valve configured to suck the fuel collected in the canister into the engine; A combustion device for burning the boil-off gas which has not been extinguished in the engine; A combustor check valve that prevents the evaporation gas in the combustor from being transmitted to the outside of the combustor; A pressure valve for controlling the pressure of the boil-off gas generated in the fuel tank regardless of whether the engine is started or turned off to prevent excessive pressure on the fuel tank; A vacuum valve for relieving the negative pressure by introducing air into the fuel tank through the canister when negative pressure is generated in the fuel tank; A relay for turning on and off a combustion action of the combustor in accordance with the temperature of the combustor; It consists of a battery that stores and supplies the operating energy of the electrical device.

As a means for achieving the above object is characterized in that it comprises the steps of: checking the contact switch state of the pressure valve when the purge valve is in operation to detect the evaporated gas stored in the canister to be sucked into the engine; Determining whether the combustor temperature sensor is operated when the contact switch is on, and returning when the contact switch is off; Detecting a relay operating state if the combustor temperature sensor has not been operated and returning if the combustor temperature sensor has been operated; If the relay is not in operation, the heater is in operation.

1 is a system diagram related to a conventional boil-off gas treatment,

2 is a schematic diagram of an evaporative gas treatment according to an embodiment of the present invention.

3 is a boil-off gas treatment method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The most preferred embodiments in which those skilled in the art may easily implement the present invention will be described in detail with reference to the accompanying drawings.

As shown in the accompanying FIG. 2, the configuration of the apparatus for treating boil-off gas according to the embodiment of the present invention is to provide the fuel until the boil-off gas becomes constant pressure in a fuel tank that stores chemical energy for powering an automobile. A fuel check valve 130 which stays in the tank; A canister 120 for collecting the evaporated gas vaporized with the fuel in the fuel tank; A purge valve 110 allowing the fuel collected in the canister 120 to be sucked into the engine; A combustor (200) combusting the boil-off gas not digested in the engine; A combustor check valve 140 which prevents the flame generated when the evaporated gas in the combustor 200 is combusted from being transferred to the outside of the combustor 200; A pressure valve 300 which regulates the pressure of the boil-off gas generated in the fuel tank regardless of whether the engine is started or turned off to prevent excessive pressure on the fuel tank; When a negative pressure is generated in the fuel tank, the vacuum valve 150 for releasing the negative pressure by introducing air into the fuel tank through the canister 120; A relay (160) for turning on and off a combustion action of the combustor according to the temperature of the combustor (200); And a battery 140 that stores and supplies energy for operating the electrical devices.

The configuration of the combustor, the combustion cylinder 210 in which the boil-off gas is sucked and burned therein; A heater 220 for applying heat to burn the boil-off gas in the combustion cylinder; A combustor temperature sensor 230 measuring a temperature of the combustor 200 and outputting a driving signal of the relay 160; It consists of a catalyst 240 for purifying the gas burned in the combustor 200.

The configuration of the pressure valve, the piston 310 is operated by the pressure generated in the fuel tank to send the boil-off gas to the combustor 200; A chassis 320 surrounding the exterior of the piston 310 to perform a fixing and passage function; When the piston 310 moves from L1 to L2 is made of a contact switch 330 that serves as a switch for connecting the power supply to the relay 160.

The operation of the boil-off gas treatment apparatus according to the embodiment of the present invention as shown in FIG. 2 and FIG. 3 is as follows.

When evaporation gas is generated in the fuel tank due to volatile matter or external conditions of the fuel, and a constant pressure is filled, the fuel check valve 130 mounted on the fuel tank is operated to collect the boil gas into the canister 120.

The boil-off gas collected in the canister 120 is sucked into the engine by the operation of the purge valve 110 and combustion occurs.

However, when the generation of boil-off gas is large even when the engine is operating or when the engine is not operated, the piston 310 of the pressure valve 300 is operated to suck the boil-off gas into the combustion cylinder 210.

As the piston of the pressure valve 300 moves from L1 to L2, the contact switch 330 is pressed and the heater 220 is operated to burn the boil-off gas inside the combustion cylinder.

When the temperature inside the combustion chamber increases, the combustor temperature sensor 230 is operated to operate the relay 160, and the relay 160 opens the heater 220 from the battery 140.

Gas burned in the combustion tank 210 is purified through the catalyst 240 and discharged to the outside.

In addition, when negative pressure is applied to the inside of the fuel tank, the vacuum valve 150 attached to the canister 120 is operated to release the negative pressure.

As described above, in the embodiment of the present invention, by applying the boil-off gas treatment apparatus of the present invention to provide an apparatus and method for the boil-off gas treatment that can prevent environmental pollution, and actively respond to the strengthening regulations of air pollution in each country. .

Claims (6)

A fuel check valve in the fuel tank for storing chemical energy for powering the vehicle so as to stay in the fuel tank until the boil-off gas becomes a constant pressure; A canister for collecting vaporized evaporated gas from the fuel in the fuel tank; A purge valve configured to suck the fuel collected in the canister into the engine; A combustion device for burning the boil-off gas which has not been extinguished in the engine; A combustor check valve that prevents the evaporation gas in the combustor from being transmitted to the outside of the combustor; A pressure valve for controlling the pressure of the boil-off gas generated in the fuel tank regardless of whether the engine is started or turned off to prevent excessive pressure on the fuel tank; A vacuum valve for relieving the negative pressure by introducing air into the fuel tank through the canister when negative pressure is generated in the fuel tank; A relay for turning on and off a combustion action of the combustor in accordance with the temperature of the combustor; And a battery for storing and supplying energy for operating the electric device. The method of claim 1, wherein the combustor, the combustion cylinder 210 is the combustion gas is sucked inside the combustion gas; A heater 220 for applying heat to burn the boil-off gas in the combustion cylinder; A combustor temperature sensor 230 measuring a temperature of the combustor 200 and outputting a driving signal of the relay 160; Evaporative gas treatment apparatus comprising a catalyst 240 for purifying the gas burned in the combustor (200). According to claim 1, wherein the pressure valve, the piston 310 is operated by the pressure generated in the fuel tank to send the boil-off gas to the combustor (200); A chassis 320 surrounding the exterior of the piston 310 to perform a fixing and passage function; Evaporating gas treatment apparatus comprising a contact switch 330 that serves as a switch for connecting the power supply to the relay 160 when the piston 310 moves from L1 to L2. The apparatus according to claim 1, wherein the pressure of the boil-off gas for operating the pressure valve is created by attaching the vacuum valve to the canister. The apparatus according to claim 1, wherein a vacuum valve is attached to the canister to reduce the negative pressure generated in the fuel tank. Checking whether or not the purge valve is in operation by the evacuation gas stored in the canister to be sucked into the engine, and checking the contact switch state of the pressure valve; Determining whether the combustor temperature sensor is operated when the contact switch is on, and returning when the contact switch is off; Detecting a relay operating state if the combustor temperature sensor has not been operated and returning if the combustor temperature sensor has been operated; A method of treating a boil-off gas, the heater operating if the relay is not operated and returning if the relay is operated.