A fire-blocking system with dredging function and its use method

Abstract

The present invention relates to a fire-blocking system with a dredging function and a method for using the same. The fire-blocking system with a dredging function comprises a tail gas delivery unit, a purge gas delivery unit, a fire-blocking unit, a purge gas collection unit and a tail gas collection unit; the tail gas delivery unit and the purge gas delivery unit are independently connected to the air inlet of the fire-blocking unit; the purge gas collection unit and the tail gas collection unit are independently connected to the air outlet of the fire-blocking unit. The fire-blocking system with a dredging function provided by the present invention has a simple structure, and the dredging of the flame arrester is achieved by switching the valve, and the equipment cost is low; the fire-blocking system with a dredging function can be designed by designing multiple groups of flame arresters connected in parallel, and independently setting inlet and outlet pipes, so that the tail gas treatment can be carried out continuously, thereby improving the efficiency of the tail gas treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proofing, and relates to a fire-blocking system and a use method thereof, and in particular to a fire-blocking system with a dredging function and a use method thereof. Background Art

[0002] A flame arrester is a device used to prevent the spread of flammable gas and flammable liquid vapor flames. It is usually installed on the inlet and outlet of the device or on the pipeline. Its function is to allow the medium to flow, but it must be able to extinguish the flame. The key to the flame arrester is the flame arrester element. The principle of extinguishing the flame is mainly to quickly reduce the flame temperature through the heat transfer of the medium, and at the same time reduce the concentration of active free radicals in the flame through the wall effect, so that the chemical reaction in the flame is slowed down until it stops, thereby preventing the flame from spreading.

[0003] For example, CN 203154665 U discloses a flame arrester for pipelines, which includes an inner shell and an outer shell, flanges are arranged at both ends of the inner shell and the outer shell, a flame arrester core is arranged in the inner shell, steel belts are arranged in the inner shell at the upper and lower ends of the flame arrester core, positioning rings and fixing rings are arranged on the left and right sides of the flame arrester core, side partitions are arranged between the flame arrester core and the positioning ring and between the flame arrester core and the fixing ring, and a heating medium inlet and outlet are opened at the upper part of one end of the outer shell and the lower part of the other end of the outer shell. The flame arrester blocks high-speed flames through the steel belt in the inner shell and the side partitions arranged at the left and right ends of the flame arrester core.

[0004] However, during the use of the flame arrester, the flame arrester filter element is prone to clogging and needs to be regularly inspected and cleaned, which affects the normal operation of the flame arrester system.

[0005] CN 110013630 A discloses a flame arrester with a self-cleaning function, including a flame arrester housing, a flame arrester element, a gas injection channel, and a gas throttle valve. The flame arrester element is at least two and is respectively distributed on both sides of the flame arrester. A gas injection channel is provided between the flame arrester elements. A gas injection pipeline is provided on the gas injection channel, and a gas throttle valve is provided on the gas injection pipeline outside the flame arrester housing. The flame arrester uses an external gas injection port to inject fresh nitrogen between the flame arrester elements. On the one hand, the nitrogen is used to purge the flame arrester element, so that it has a self-cleaning effect. At the same time, continuous purge can ensure that the flame arrester element has a lower temperature, thereby improving its flame arresting efficiency. However, the flame arrester needs to continuously introduce external gas during use, which is relatively expensive.

[0006] CN 206007846 U discloses an anti-blocking flue flame arrester, comprising a chimney, an automatic descaling mechanism, a bracket and a top cover. The bracket is welded to the upper part of the chimney, and the top cover is installed on the upper part of the bracket; the automatic descaling mechanism comprises a lower stainless steel wire mesh, a stainless steel brush, a rotating shaft, an upper stainless steel wire mesh, a flange, a bearing, a bottom plate and an arrow-shaped weather vane, and the stainless steel brush is fixed to the lower part of the rotating shaft by bolts; the lower stainless steel wire mesh is installed under the stainless steel brush; the rotating shaft is connected to a flange with multiple holes through a bearing. Although the anti-blocking flue flame arrester can alleviate the blockage problem of the flame arrester through the stainless steel mesh and the stainless steel brush, the pressure drop at the flame arrester is large, which is not conducive to improving the gas processing efficiency.

[0007] In this regard, providing a fire-blocking system with a dredging function that has high fire-blocking efficiency and does not affect exhaust emissions and a method of using the same is of great significance for improving the emission efficiency of combustible exhaust gas, thereby improving the production efficiency of the enterprise. Summary of the invention

[0008] The object of the present invention is to provide a fire-blocking system with a dredging function and a method of using the same. The fire-blocking system with a dredging function uses external steam to purge the flame arrester and collects the cooling gas after the purge, thereby improving resource utilization efficiency.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a fire-blocking system with a dredging function, the fire-blocking system with a dredging function comprising a tail gas delivery unit, a purge gas delivery unit, a fire-blocking unit, a purge gas collection unit and a tail gas collection unit;

[0011] The tail gas delivery unit and the purge gas delivery unit are independently connected to the air inlet of the fire arrester unit;

[0012] The purge gas collection unit and the tail gas collection unit are independently connected to the gas outlet of the fire arrester unit.

[0013] Impurities in the tail gas may clog the fire-blocking unit. The present invention uses a purge gas delivery unit to purge the fire-blocking unit, and the purged gas is collected by a purge gas collection unit, thereby achieving the purpose of unblocking the fire-blocking unit.

[0014] Preferably, the exhaust gas delivery unit comprises an exhaust gas delivery pipeline and an exhaust gas delivery valve arranged on the exhaust gas delivery pipeline.

[0015] Preferably, the exhaust gas delivery valve comprises an exhaust gas delivery solenoid valve and / or an exhaust gas delivery pneumatic valve.

[0016] The present invention can realize rapid control of the opening and closing of the exhaust gas delivery pipeline by arranging a solenoid valve and / or a pneumatic valve for controlling the exhaust gas delivery in the exhaust gas delivery pipeline. Preferably, the opening and closing of the solenoid valve and / or the pneumatic valve is controlled by a control unit, and the control unit includes but is not limited to a PLC control unit and / or a DCS control unit, which will not be described in detail in the present invention.

[0017] Preferably, the purge gas delivery unit comprises a purge gas delivery pipeline and a purge gas delivery valve arranged on the purge gas delivery pipeline.

[0018] Preferably, the purge gas delivery valve comprises a purge gas delivery solenoid valve and / or a purge gas delivery pneumatic valve.

[0019] The present invention can realize rapid control of the opening and closing of the purge gas delivery pipeline by arranging a solenoid valve and / or a pneumatic valve for controlling the purge gas delivery in the purge gas delivery pipeline. Preferably, the opening and closing of the solenoid valve and / or the pneumatic valve is controlled by a control unit, and the control unit includes but is not limited to a PLC control unit and / or a DCS control unit, which will not be described in detail in the present invention.

[0020] Preferably, the purge gas delivery unit further comprises a purge gas bypass, a manual valve arranged on the purge gas bypass, and manual valves arranged on both sides of the purge gas delivery valve on the purge gas delivery pipeline;

[0021] When the purge gas delivery valve on the purge gas delivery pipeline operates normally, the manual valve on the purge gas bypass is closed, and at the same time, the manual valves on both sides of the purge gas delivery valve are opened; when the purge gas delivery valve on the purge gas delivery pipeline fails to operate normally, the manual valve on the purge gas bypass is opened, and at the same time, the manual valves on both sides of the purge gas delivery valve are closed.

[0022] Preferably, the air inlet of the fire-blocking unit is provided with a gas nozzle. Through the provision of the nozzle, the gas can better contact the wire mesh in the fire-blocking unit.

[0023] Preferably, the exhaust gas collecting unit comprises an exhaust gas collecting pipe and an exhaust gas collecting valve arranged on the exhaust gas collecting pipe.

[0024] Preferably, the exhaust gas collection valve includes an exhaust gas collection solenoid valve and / or an exhaust gas collection pneumatic valve.

[0025] The present invention can realize rapid control of the opening and closing of the exhaust gas collection pipeline by arranging a solenoid valve and / or a pneumatic valve for controlling the exhaust gas collection in the exhaust gas collection pipeline. Preferably, the opening and closing of the solenoid valve and / or the pneumatic valve is controlled by a control unit, and the control unit includes but is not limited to a PLC control unit and / or a DCS control unit, which will not be described in detail in the present invention.

[0026] Preferably, the purge gas collecting unit comprises a purge gas collecting pipeline and a purge gas collecting valve arranged on the purge gas collecting pipeline.

[0027] The purge gas collection pipeline is connected to the connection pipeline between the tail gas collection valve and the fire arresting unit.

[0028] Preferably, the purge gas collection valve comprises a purge gas collection solenoid valve and / or a purge gas collection pneumatic valve.

[0029] Preferably, a sight glass is also provided on the purge gas collection pipe. The present invention provides a sight glass so that a person skilled in the art can observe the condensation of the purge gas through the sight glass, thereby visually judging the cleanliness of the purge gas and further judging the dredging effect of the flame arrester.

[0030] The present invention can realize rapid control of the opening and closing of the purge gas collection pipeline by arranging a solenoid valve and / or a pneumatic valve for controlling the collection of purge gas in the purge gas collection pipeline. Preferably, the opening and closing of the solenoid valve and / or the pneumatic valve is controlled by a control unit, and the control unit includes but is not limited to a PLC control unit and / or a DCS control unit, which will not be described in detail in the present invention.

[0031] Preferably, the purge gas collection unit also includes a purge gas collection bypass, a manual valve arranged on the purge gas collection bypass, and manual valves arranged on both sides of the purge gas collection valve on the purge gas collection pipeline; the purge gas collection bypass and the manual valve are standby to prevent the purge gas collection valve from malfunctioning.

[0032] When the purge gas collecting valve on the purge gas collecting pipeline operates normally, the manual valve on the purge gas collecting bypass is closed, and at the same time, the manual valves on both sides of the purge gas collecting valve are opened; when the purge gas collecting valve on the purge gas collecting pipeline fails to operate normally, the manual valve on the purge gas collecting bypass is opened, and at the same time, the manual valves on both sides of the purge gas collecting valve are closed.

[0033] Preferably, the fire arrester unit comprises at least one flame arrester and pressure gauges independently arranged at both ends of each flame arrester; the pressure gauge is used to measure the pressure difference between the flame arrester air inlet and air outlet brackets.

[0034] The fire arrester unit includes at least one flame arrester, for example, 1, 2, 3, 4, 5 or 6 flame arresters connected in series and / or in parallel, including but not limited to the listed values, and other values ​​not listed in the numerical range are also applicable. Preferably, there are at least two flame arresters connected in parallel and pressure gauges independently arranged at both ends of each flame arrester, and the pressure gauge is used to measure the pressure difference between the flame arrester air inlet and air outlet brackets.

[0035] The tail gas delivery unit and the purge gas delivery unit are independently connected to the air inlet of each flame arrester.

[0036] The exhaust gas delivery unit and the purge gas delivery unit of the present invention are independently connected to the air inlet of each flame arrester, which means that when the flame arrester unit includes two flame arresters connected in parallel, the exhaust gas delivery unit includes two independent exhaust gas delivery pipelines, and the two independent exhaust gas delivery pipelines are respectively connected to the air inlet of the corresponding flame arrester; the purge gas collection unit includes two independent purge gas delivery pipelines, and the two independent purge gas delivery pipelines are respectively connected to the air inlet of the corresponding flame arrester.

[0037] When the flame arrester unit includes three flame arresters connected in parallel, the exhaust gas delivery unit includes three independent exhaust gas delivery pipelines, which are respectively connected to the air inlets of the corresponding flame arresters; the purge gas collection unit includes three independent purge gas delivery pipelines, which are respectively connected to the air inlets of the corresponding flame arresters.

[0038] The purge gas collection unit and the tail gas collection unit are independently connected to the gas outlet of each flame arrester.

[0039] The exhaust gas collecting unit and the purge gas collecting unit of the present invention are independently connected to the air inlet of each flame arrester, which means that when the flame arrester unit includes two flame arresters connected in parallel, the exhaust gas collecting unit includes two independent exhaust gas collecting pipes, and the two independent exhaust gas collecting pipes are respectively connected to the air inlet of the corresponding flame arrester; the purge gas collecting unit includes two independent purge gas collecting pipes, and the two independent purge gas collecting pipes are respectively connected to the air inlet of the corresponding flame arrester.

[0040] When the flame arrester unit includes three flame arresters connected in parallel, the exhaust gas collecting unit includes three independent exhaust gas collecting pipes, which are respectively connected to the air inlets of the corresponding flame arresters; the purge gas collecting unit includes three independent purge gas collecting pipes, which are respectively connected to the air inlets of the corresponding flame arresters.

[0041] In a second aspect, the present invention provides a method for using the flame arrester with a dredging function as described in the first aspect, the method comprising the following steps: purging the flame arrester with a purge gas, and collecting the gas of the purge gas.

[0042] Preferably, the purge gas is saturated steam with a temperature of 100-150°C and an absolute pressure of 0.1-0.5 MPa, and the temperature of the saturated steam is 100°C, 110°C, 120°C, 130°C, 140°C or 150°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are equally applicable; the absolute pressure of the saturated steam is 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa or 0.5 MPa, but is not limited to the listed values, and other values ​​not listed within the numerical range are equally applicable.

[0043] Preferably, the specific operation of purging the flame arrester with purge gas is as follows: judging the pressure difference at the inlet and outlet of the flame arrester according to the pressure gauge readings on both sides of the flame arrester, when the pressure difference reaches 800Pa or more, it indicates that the flame arrester is blocked; at this time, the exhaust gas delivery pipeline and the exhaust gas collecting pipeline are closed by controlling the opening and closing of the valve, and at the same time, the purge gas delivery pipeline and the purge gas collecting pipeline are opened, and the flame arrester is purged with purge gas. When the pressure difference at the inlet and outlet of the flame arrester is reduced to below 700Pa, the flame arrester is unblocked, and clean condensed water is observed in the sight glass. At this time, the purge gas delivery pipeline and the purge gas collecting pipeline are closed by controlling the opening and closing of the valve, and at the same time, the exhaust gas delivery pipeline and the exhaust gas collecting pipeline are opened.

[0044] Preferably, when the flame arrester unit comprises at least two flame arresters connected in parallel, when one of the flame arresters is blocked, the blocked flame arrester is purged, and the other unblocked flame arresters are opened at the same time, so as to ensure the continuity of exhaust gas treatment. When the blocked flame arrester is dredged, the flame arrester is put into standby use.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] (1) The fire arrester system with dredging function provided by the present invention has a simple structure, and the flame arrester can be dredged by switching the valve, and the equipment cost is low;

[0047] (2) The fire arresting system with dredging function provided by the present invention can continuously treat the exhaust gas by designing multiple groups of flame arresters connected in parallel and respectively setting independent inlet and outlet pipes, thereby improving the efficiency of the exhaust gas treatment;

[0048] (3) The fire-blocking system with dredging function provided by the present invention can improve the safety of the system by setting a bypass. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of the structure of a fire-blocking system with a dredging function provided in Example 1;

[0050] Figure 2 A schematic diagram of the structure of a fire-blocking system with a dredging function provided in Example 2;

[0051] Figure 3 A schematic diagram of the structure of a fire-blocking system with a dredging function provided in Example 3;

[0052] Figure 4 A schematic structural diagram of a fire-blocking system with a dredging function provided in Example 4.

[0053] Among them: 1-1, the first exhaust gas delivery valve; 1-2, the second exhaust gas delivery valve; 2-1, the first exhaust gas collection valve; 2-2, the second exhaust gas collection valve; 3-1, the first purge gas delivery valve; 3-2, the second purge gas delivery valve; 4-1, the first purge gas collection valve; 4-2, the second purge gas collection valve; 5-1, the first flame arrester; 5-2, the second flame arrester; 6, manual valve; 7, sight glass. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0055] Example 1

[0056] This embodiment provides a fire-blocking system with a dredging function. The structural schematic diagram of the fire-blocking system with a dredging function is as follows: Figure 1 As shown, it includes an exhaust gas delivery unit, a purge gas delivery unit, a flame arrester unit, a purge gas collection unit and an exhaust gas collection unit.

[0057] The flame arrester unit includes a first flame arrester 5-1 and pressure gauges respectively arranged at the inlet and outlet of the first flame arrester 5-1, and the air inlet of the first flame arrester 5-1 is provided with an air inlet nozzle; the exhaust gas delivery unit includes an exhaust gas delivery pipeline and a first exhaust gas delivery valve 1-1 arranged on the exhaust gas delivery pipeline; the purge gas delivery unit includes a purge gas delivery pipeline and a first purge gas delivery valve 3-1 arranged on the purge gas delivery pipeline; the exhaust gas delivery unit and the purge gas delivery unit are respectively and independently connected to the air inlet of the flame arrester unit.

[0058] The tail gas collecting unit includes a tail gas collecting pipe and a first tail gas collecting valve 2-1 arranged on the tail gas collecting pipe; the purge gas collecting unit includes a purge gas collecting pipe and a first purge gas collecting valve 4-1 arranged on the purge gas collecting pipe; the purge gas collecting unit and the tail gas collecting unit are respectively and independently connected to the gas outlet of the fire arresting unit.

[0059] The first tail gas delivery valve 1 - 1 , the first tail gas collection valve 2 - 1 , the first purge gas delivery valve 3 - 1 and the first purge gas collection valve 4 - 1 are respectively and independently solenoid valves and / or pneumatic valves.

[0060] When the fire arrester system with dredging function described in this embodiment is used, the first flame arrester 5-1 is judged whether it is blocked according to the pressure gauges on both sides of the first flame arrester 5-1. When the pressure difference on both sides of the first flame arrester 5-1 is above 800Pa, the first tail gas delivery valve 1-1 and the first tail gas collection valve 2-1 are closed, and the first purge gas delivery valve 3-1 and the first purge gas collection valve 4-1 are opened at the same time, and the first flame arrester 5-1 is purged with saturated steam with an absolute pressure of 0.1-0.5MPa and a temperature of 100-150°C. When the pressure difference on both sides of the first flame arrester 5-1 is reduced to below 600Pa, the first tail gas delivery valve 1-1 and the first tail gas collection valve 2-1 are opened, and the first purge gas delivery valve 3-1 and the first purge gas collection valve 4-1 are closed at the same time, and the purge of the first flame arrester 5-1 is completed.

[0061] Example 2

[0062] This embodiment provides a fire-blocking system with a dredging function. The structural schematic diagram of the fire-blocking system with a dredging function is as follows: Figure 2 As shown, it includes an exhaust gas delivery unit, a purge gas delivery unit, a flame arrester unit, a purge gas collection unit and an exhaust gas collection unit.

[0063] The flame arrester unit includes a first flame arrester 5-1 and a second flame arrester 5-2 connected in parallel, and pressure gauges independently arranged on both sides of the first flame arrester 5-1 and the second flame arrester 5-2, and the air inlets of the first flame arrester 5-1 and the second flame arrester 5-2 are provided with air inlet nozzles; the exhaust gas delivery unit includes two independent exhaust gas delivery pipelines, and the first exhaust gas delivery valve 1-1 and the first exhaust gas delivery valve 1-2 are independently arranged on the two exhaust gas delivery pipelines; the purge gas delivery unit includes two independent purge gas delivery pipelines, and the first purge gas delivery valve 3-1 and the second purge gas delivery valve 3-2 are independently arranged on the two purge gas delivery pipelines; the exhaust gas delivery pipeline and the purge gas delivery pipeline are independently connected to the air inlet of the corresponding flame arrester.

[0064] The exhaust gas collecting unit includes two independent exhaust gas collecting pipes, and the first exhaust gas collecting valve 2-1 and the second exhaust gas collecting valve 2-2 are independently arranged on the two exhaust gas collecting pipes; the purge gas collecting unit includes two independent purge gas collecting pipes, and the first purge gas collecting valve 4-1 and the second purge gas collecting valve 4-2 are independently arranged on the two purge gas collecting pipes; the exhaust gas collecting pipe and the purge gas collecting pipe are independently connected to the corresponding gas outlet of the flame arrester.

[0065] The first exhaust gas delivery valve 1-1, the first exhaust gas delivery valve 1-2, the first exhaust gas collection valve 2-1, the second exhaust gas collection valve 2-2, the first purge gas delivery valve 3-1, the second purge gas delivery valve 3-2, the first purge gas collection valve 4-1 and the second purge gas collection valve 4-2 are independently solenoid valves and / or pneumatic valves.

[0066] When the fire arrester system with dredging function described in this embodiment is used, the first flame arrester 5-1 and the second flame arrester 5-2 are in one open and one standby. Whether the first flame arrester 5-1 is blocked is judged according to the pressure gauges on both sides of the first flame arrester 5-1. When the pressure difference on both sides of the first flame arrester 5-1 is above 800Pa, the first tail gas delivery valve 1-1 and the first tail gas collection valve 2-1 are closed, and the first purge gas delivery valve 3-1 and the first purge gas collection valve 4-1 are opened at the same time, and the first flame arrester 5-1 is purged with saturated steam with an absolute pressure of 0.1-0.5MPa and a temperature of 100-150°C.

[0067] At the same time, the first tail gas delivery valve 1-2 and the second tail gas collection valve 2-2 are opened to allow the tail gas to flow through the second flame arrester 5-2.

[0068] When the pressure difference on both sides of the first flame arrester 5-1 drops below 600Pa, the first purge gas delivery valve 3-1 and the first purge gas collection valve 4-1 are closed to complete the purge of the first flame arrester 5-1, and the first flame arrester 5-1 is kept in standby mode. When the pressure difference on both sides of the second flame arrester 5-2 is above 800Pa, the second flame arrester 5-2 is purged, and the exhaust gas is allowed to flow through the first flame arrester 5-1.

[0069] Example 3

[0070] This embodiment provides a fire-blocking system with a dredging function. The structural schematic diagram of the fire-blocking system with a dredging function is as follows: Figure 3 As shown, it includes an exhaust gas delivery unit, a purge gas delivery unit, a flame arrester unit, a purge gas collection unit and an exhaust gas collection unit.

[0071] Compared with Example 2, in the fire-blocking system with dredging function provided in this embodiment, the purge gas delivery unit also includes a purge gas bypass, a manual valve 6 arranged on the purge gas bypass, and manual valves 6 arranged on both sides of the purge gas delivery valve on the purge gas delivery pipeline; the purge gas collecting unit also includes a purge gas collecting bypass, a manual valve 6 arranged on the purge gas collecting bypass, and manual valves 6 arranged on both sides of the purge gas collecting valve on the purge gas collecting pipeline; the rest are the same as Example 2.

[0072] The purge gas bypass and the manual valve 6 are standby to prevent the purge gas delivery valve from malfunctioning. When the purge gas delivery valve on the purge gas delivery pipeline operates normally, the manual valve 6 on the purge gas bypass is closed, and at the same time, the manual valves 6 on both sides of the purge gas delivery valve are opened; when the purge gas delivery valve on the purge gas delivery pipeline fails to operate normally, the manual valve 6 on the purge gas bypass is opened, and at the same time, the manual valves 6 on both sides of the purge gas delivery valve are closed.

[0073] The purge gas collecting bypass and the manual valve 6 are standby to prevent the purge gas collecting valve from malfunctioning. When the purge gas collecting valve on the purge gas collecting pipeline operates normally, the manual valve 6 on the purge gas collecting bypass is closed, and at the same time, the manual valves 6 on both sides of the purge gas collecting valve are opened; when the purge gas collecting valve on the purge gas collecting pipeline fails to operate normally, the manual valve 6 on the purge gas collecting bypass is opened, and at the same time, the manual valves 6 on both sides of the purge gas collecting valve are closed.

[0074] Example 4

[0075] This embodiment provides a fire-blocking system with a dredging function. The structural schematic diagram of the fire-blocking system with a dredging function is as follows: Figure 4 As shown, it includes an exhaust gas delivery unit, a purge gas delivery unit, a flame arrester unit, a purge gas collection unit and an exhaust gas collection unit.

[0076] Compared with Example 3, in the fire arresting system with unblocking function provided in this embodiment, a sight glass 7 is further provided on the purge gas collecting pipe, and the sight glass 7 is used by technical personnel in the field to observe the condensation of the purge gas, so as to visually judge the cleanliness of the purge gas and further judge the unblocking effect of the flame arrester.

[0077] When the fire arrester system with dredging function described in this embodiment is used, the first flame arrester 5-1 and the second flame arrester 5-2 are in one open and one standby. Whether the first flame arrester 5-1 is blocked is judged according to the pressure gauges on both sides of the first flame arrester 5-1. When the pressure difference on both sides of the first flame arrester 5-1 is above 800Pa, the first tail gas delivery valve 1-1 and the first tail gas collection valve 2-1 are closed, and the first purge gas delivery valve 3-1 and the first purge gas collection valve 4-1 are opened at the same time, and the first flame arrester 5-1 is purged with saturated steam with an absolute pressure of 0.1-0.5MPa and a temperature of 100-150°C.

[0078] At the same time, the first tail gas delivery valve 1-2 and the second tail gas collection valve 2-2 are opened to allow the tail gas to flow through the second flame arrester 5-2.

[0079] When the crystallization of the purge gas condensate is observed in the sight glass 7, the first flame arrester 5-1 is purged, the first purge gas delivery valve 3-1 and the first purge gas collection valve 4-1 are closed, the purge of the first flame arrester 5-1 is completed, and the first flame arrester 5-1 is kept in standby mode. When the pressure difference between the two sides of the second flame arrester 5-2 is above 800Pa, the second flame arrester 5-2 is purged, and the exhaust gas is allowed to flow through the first flame arrester 5-1.

[0080] In summary, the fire-blocking system with a dredging function provided by the present invention has a simple structure, and the dredging of the flame arrester is achieved by switching the valve, and the equipment cost is low; the fire-blocking system with a dredging function provided by the present invention can be designed by designing multiple groups of flame arresters connected in parallel, and independent inlet and outlet pipes are respectively set, so that the exhaust gas treatment can be carried out continuously, thereby improving the efficiency of the exhaust gas treatment; the fire-blocking system with a dredging function provided by the present invention can improve the safety of the system by setting a bypass.

[0081] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A fire-blocking system with dredging function, characterized in that: The fire-blocking system with dredging function comprises an exhaust gas delivery unit, a purge gas delivery unit, a fire-blocking unit, a purge gas collection unit and an exhaust gas collection unit; the air inlet of the fire-blocking unit is provided with a gas nozzle; The tail gas delivery unit comprises a tail gas delivery pipeline and a tail gas delivery valve arranged on the tail gas delivery pipeline; The purge gas delivery unit comprises a purge gas delivery pipeline and a purge gas delivery valve arranged on the purge gas delivery pipeline; The flame arrester unit comprises at least two flame arresters connected in parallel and pressure gauges independently arranged at both ends of each flame arrester, and the pressure gauges are used to measure the pressure difference between the air inlet and the air outlet of the flame arrester; The purge gas collection unit includes a purge gas collection pipeline and a purge gas collection valve arranged on the purge gas collection pipeline; a sight glass is arranged on the purge gas collection pipeline; the purge gas is saturated steam; the sight glass is used to observe the condensation of the purge gas; The tail gas collection unit comprises a tail gas collection pipeline and a tail gas collection valve arranged on the tail gas collection pipeline; The tail gas delivery unit and the purge gas delivery unit are independently connected to the air inlet of the fire arrester unit; The purge gas collection unit and the tail gas collection unit are independently connected to the gas outlet of the fire arrester unit.

2. The fire-blocking system with dredging function according to claim 1, characterized in that: The exhaust gas delivery valve includes an exhaust gas delivery solenoid valve and / or an exhaust gas delivery pneumatic valve.

3. The fire-blocking system with dredging function according to claim 1, characterized in that: The purge gas delivery valve includes a purge gas delivery solenoid valve and / or a purge gas delivery pneumatic valve.

4. The fire-blocking system with dredging function according to claim 1, characterized in that: The purge gas delivery unit further includes a purge gas bypass, a manual valve arranged on the purge gas bypass, and manual valves arranged on both sides of the purge gas delivery valve on the purge gas delivery pipeline; The purge gas bypass and manual valve are in reserve to prevent the purge gas delivery valve from malfunctioning.

5. The fire-blocking system with dredging function according to claim 1, characterized in that: The tail gas collection valve includes a tail gas collection solenoid valve and / or a tail gas collection pneumatic valve.

6. The fire-blocking system with dredging function according to claim 1, characterized in that: The purge gas collection valve includes a purge gas collection solenoid valve and / or a purge gas collection pneumatic valve.

7. The fire-blocking system with dredging function according to claim 1, characterized in that: The purge gas collection unit also includes a purge gas collection bypass, a manual valve arranged on the purge gas collection bypass, and manual valves arranged on both sides of the purge gas collection valve on the purge gas collection pipeline; the purge gas collection bypass and the manual valve are standby to prevent the purge gas collection valve from malfunctioning.

8. The fire-blocking system with dredging function according to claim 1, characterized in that: The flame arrester unit comprises at least one flame arrester and pressure gauges independently arranged at both ends of each flame arrester; The pressure gauge is used to measure the pressure difference between the air inlet and the air outlet of the flame arrester.

9. The fire-blocking system with dredging function according to claim 1, characterized in that: The tail gas delivery unit and the purge gas delivery unit are independently connected to the air inlet of each flame arrester; The purge gas collection unit and the tail gas collection unit are independently connected to the gas outlet of each flame arrester.

10. A method for using the fire-blocking system with dredging function according to any one of claims 1 to 9, characterized in that: The method of use comprises the following steps: using a purge gas to purge the flame arrester, and collecting the purge gas; The specific operation of using the purge gas to purge the flame arrester is as follows: judging the pressure difference between the inlet and outlet of the flame arrester according to the pressure gauge readings on both sides of the flame arrester, when the pressure difference reaches 800Pa or more, it indicates that the flame arrester is blocked; at this time, the tail gas delivery pipeline and the tail gas collecting pipeline are closed by controlling the opening and closing of the valve, and at the same time, the purge gas delivery pipeline and the purge gas collecting pipeline are opened, and the flame arrester is purged with the purge gas, and when the pressure difference between the inlet and outlet of the flame arrester is reduced to below 700Pa, the flame arrester is unblocked, and clean condensed water is observed in the sight glass, at this time, the purge gas delivery pipeline and the purge gas collecting pipeline are closed by controlling the opening and closing of the valve, and at the same time, the tail gas delivery pipeline and the tail gas collecting pipeline are opened.

11. The method of use according to claim 10, characterized in that: The purge gas is saturated steam with a temperature of 100-150° C. and an absolute pressure of 0.1-0.5 MPa.

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