Device for purifying and discharging waste gas after detection of liquefied natural gas (LNG)
By designing a graded purification treatment device for low-concentration and high-concentration methane waste gas, the problems of shortened lifespan and increased cost of purification materials were solved, achieving efficient and economical waste gas purification.
Patent Information
- Application Number
- CN202520400880.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Existing technologies cannot specifically treat methane waste gas of different concentrations when purifying waste gas after LNG testing, resulting in a shortened lifespan of purification materials and increased costs.
An LNG liquefied natural gas detection exhaust gas purification device was designed, which includes a low-concentration exhaust gas filtration mechanism and a high-concentration exhaust gas elimination mechanism. The low-concentration and high-concentration methane exhaust gases are treated by sleeve and air duct systems, respectively. The low-concentration exhaust gas is filtered through a filter tank and a purification tank, while the high-concentration exhaust gas is ignited in an ignition box to reach the combustion point for purification.
It achieves efficient purification of methane waste gas of different concentrations, extends the service life of purification materials, and reduces purification costs.
Smart Images
Figure CN223924839U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to waste gas purification and emission technical field, concretely is a kind of LNG liquefied natural gas detection waste gas purification and emission device. BACKGROUND
[0002] Impurities need to be removed in the production process of liquefied natural gas (LNG) through pretreatment process, mainly including deacidification (amine method or membrane separation technology to remove CO2, H2S), dehydration (molecular sieve adsorption or low-temperature separation), mercury removal (activated carbon adsorption) and heavy hydrocarbon removal (low-temperature fractionation), to ensure the low-temperature storage stability and combustion safety of LNG. The purified natural gas is liquefied at -162℃, and the evaporation gas (BOG) generated in the transportation and storage link is recovered by recondensation or injected into the pipe network by compressor, and in some scenarios, flammable gas is treated by torch combustion, but strict emission standards need to be followed to control VOCs and NOx and other pollutants. Natural gas leakage hazards involve multidimensional risks: methane, as the main component, has flammable and explosive characteristics, and when the volume concentration is 5%-15%, it will ignite and explode when encountering a fire source; high-concentration methane leakage can cause local oxygen deficiency and induce suffocation, and if it contains H2S and other toxic impurities, it will increase the risk of acute poisoning; on the environmental level, the global warming potential (GWP) of methane is 25 times that of CO2, which exacerbates climate change, and leakage may induce secondary ecological problems such as soil acidification and groundwater pollution. The existing technology uses real-time monitoring means such as laser methane detection and infrared imaging instrument in combination with emergency shutdown system, double-wall storage tank and redundant sealing design to reduce the probability of leakage, but it still needs to strengthen the LDAR (leak detection and repair) management of the whole industry chain to improve the risk prevention and control capability.
[0003] Since natural gas is hazardous and harmful to the environment, natural gas waste gas generally needs multiple purification, and since the substance is prone to leakage, there may still be different concentrations of methane residues in natural gas waste gas, and due to the uncertainty of its concentration, general purification devices usually uniformly filter and adsorb different concentrations of natural gas during waste gas purification, which will accelerate the consumption of activated carbon and other purification materials, increase costs and consumption time to replace the purification materials, so a device capable of different purification treatment according to different concentrations of methane waste gas is needed. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a kind of LNG liquefied natural gas detection waste gas purification and emission device to solve the problems raised in the above background technology.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste gas purification and emission device after LNG liquefied natural gas testing, comprising a waste gas pipeline, a filter tank fixedly connected to one side of the waste gas pipeline, and a purification tank connected to the filter tank. A low-concentration waste gas filtration mechanism is provided on the right side of the waste gas pipeline, and a high-concentration waste gas elimination mechanism is provided on the upper side of the low-concentration waste gas filtration mechanism.
[0006] The low-concentration waste gas filtration mechanism includes a sleeve connected to one end of a waste gas pipeline. A filter pipe is connected to the lower side of the sleeve, and a transfer pipe is connected to the upper end of the filter tank. A wind box is connected to the middle side of the transfer pipe. A support is fixedly connected inside the wind box, and a motor is fixedly connected inside the support. A guide fan blade is fixedly connected to one end of the motor. A collection tank is connected to one end of the transfer pipe, and a flow transfer pipe is connected between the collection tank and the purification tank. A filter plate is fixedly connected inside the purification tank.
[0007] Preferably, multiple filter plates are provided.
[0008] Preferably, the diameter of the sleeve is smaller than the diameter of the inner wall of the filter vessel.
[0009] Preferably, the agglomeration vessel is configured as a barrel-shaped structure that is narrow at the top and wide at the bottom.
[0010] Preferably, the high-concentration waste gas elimination mechanism includes a duct, which is connected to the upper end of the collection vessel. A suspension is fixedly connected inside the duct, and a motor is fixedly connected inside the suspension. An air-blowing fan blade is fixedly connected to the output end of the motor. A branch pipe is connected to the upper end of the duct, and a stop block is fixedly connected inside the branch pipe. A spring is fixedly connected to the inner side of the stop block, and a ball stop is fixedly connected to the lower end of the spring. The ball stop is located inside the stop block. An ignition box is connected to the upper end of the branch pipe. A partition is slidably connected inside the ignition box, and a limit rod is fixedly connected to the outer side of the partition. The limit rod is slidably connected inside the ignition box, and a counterweight is fixedly connected to the lower end of the limit rod. A switch is provided on one side of the ignition box, and an ignition head is fixedly connected to the upper inner wall of the ignition box. A return pipe is connected between the purification vessel and the collection vessel, and a pressure protection valve is connected inside the return pipe. A pressure relief valve is connected to the bottom of the ignition box.
[0011] Preferably, the switch is electrically connected to the ignition head.
[0012] Preferably, the switch is located in the middle of the outer side of the ignition box.
[0013] Compared with the prior art, this utility model provides a device for purifying and discharging exhaust gas after LNG liquefied natural gas detection, which has the following beneficial effects:
[0014] 1. The high-concentration waste gas elimination mechanism is used for gathering methane and treating different concentrations of methane, which makes the methane be ignited when the concentration reaches the ignition point through multiple loop systems, and when the methane concentration is not enough to ignite, the methane waste gas is filtered through the loop, thereby ensuring the purpose of purifying the methane and saving the filtering cost.
[0015] 2. The low-concentration waste gas filtering mechanism is used for purifying waste gas, which eliminates harmful particle residues and dust carried in the waste gas through the sleeve and the filtering pipe, and then filters the low-concentration waste gas, thereby ensuring that the content of the methane reaches the emission standard. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor:
[0017] Figure 1 It is a structural schematic diagram of the present application;
[0018] Figure 2 It is a structural schematic diagram of the present application from another perspective;
[0019] Figure 3 It is a sectional structural schematic diagram of the present application;
[0020] Figure 4 It is a structural schematic diagram of the gathering kettle in the present application;
[0021] Figure 5 It is a structural schematic diagram of the partition plate in the present application.
[0022] In the drawings: 1, waste gas pipeline; 2, filtering kettle; 3, purification kettle; 4, low-concentration waste gas filtering mechanism; 401, sleeve; 402, filtering pipe; 403, transfer pipe; 404, air bellow; 405, support; 406, motor; 407, drainage fan blade; 408, gathering kettle; 409, flow transfer pipe; 410, filter plate; 5, high-concentration waste gas elimination mechanism; 501, air bellow; 502, suspension; 503, motor; 504, air feeding fan blade; 505, branch pipe; 506, stop block; 507, spring; 508, stop ball; 509, ignition box; 510, partition plate; 511, limiting rod; 512, counterweight; 513, switch; 514, ignition head; 515, backflow pipe; 516, pressure protection valve; 517, pressure relief valve. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.
[0024] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.
[0025] Embodiment one:
[0026] Please refer to Figures 1-5 The present application provides a technical scheme: a LNG liquefied natural gas detection exhaust gas purification and emission device, which comprises an exhaust gas pipeline 1, a filter kettle 2 fixedly connected on one side of the exhaust gas pipeline 1, and a purification kettle 3 arranged in communication with the filter kettle 2, a low-concentration exhaust gas filtering mechanism 4 arranged on the right side of the exhaust gas pipeline 1, and a high-concentration exhaust gas eliminating mechanism 5 arranged on the upper side of the low-concentration exhaust gas filtering mechanism 4.
[0027] The low-concentration exhaust gas filtering mechanism 4 comprises a sleeve 401, which is arranged in communication at one end of the exhaust gas pipeline 1, and a filter pipe 402 arranged in communication at the lower side of the sleeve 401, a transfer pipe 403 arranged in communication at the upper end of the filter kettle 2, a bellows 404 arranged in communication at the middle side of the transfer pipe 403, a bracket 405 fixedly connected inside the bellows 404, a motor 406 fixedly connected inside the bracket 405, a drainage fan blade 407 fixedly connected at one end of the motor 406, an aggregation kettle 408 arranged in communication at one end of the transfer pipe 403, a flow transfer pipe 409 arranged in communication between the aggregation kettle 408 and the purification kettle 3, a filter plate 410 fixedly connected inside the purification kettle 3, and the filter plate 410 is of different types and used for filtering different harmful gases in the natural gas exhaust gas.
[0028] Further, the filter plate 410 is provided with a plurality of.
[0029] Further, the diameter of the sleeve 401 is smaller than the diameter of the inner wall of the filter kettle 2.
[0030] Further, the aggregation kettle 408 is provided in a barrel-shaped structure with a narrow upper part and a wide lower part.
[0031] Embodiment two:
[0032] The mechanism is used for treating waste gas with different densities, and solves the problem that the service life of the filtering material is shortened when high-concentration natural gas is discharged, please refer to Figures 1-5 In combination with the first embodiment, it is further obtained that the high-concentration waste gas elimination mechanism 5 comprises a wind tube 501 which is communicated and arranged on the upper end of the gathering kettle 408, a hanger 502 is fixedly connected in the wind tube 501, a motor 503 is fixedly connected in the hanger 502, a gas sending fan blade 504 is fixedly connected at the output end of the motor 503, a branch pipe 505 is communicated and arranged on the upper end of the wind tube 501, a stop block 506 is fixedly connected in the branch pipe 505, a spring 507 is fixedly connected on the inner side of the stop block 506, a stop ball 508 is fixedly connected at the lower end of the spring 507, the stop ball 508 is arranged on the inner side of the stop block 506, an ignition box 509 is communicated and arranged on the upper end of the branch pipe 505, a partition plate 510 is sealingly and slidably connected in the ignition box 509, a limiting rod 511 is fixedly connected on the outer side of the partition plate 510, the limiting rod 511 is slidably connected in the ignition box 509, a counterweight 512 is fixedly connected at the lower end of the limiting rod 511, a switch 513 is arranged on one side of the ignition box 509, an ignition head 514 is fixedly connected on the inner wall of the upper side of the ignition box 509, a reflux pipe 515 is communicated and arranged between the purification kettle 3 and the gathering kettle 408, a pressure protection valve 516 is communicated and arranged in the reflux pipe 515, a pressure relief valve 517 is communicated and arranged at the bottom of the ignition box 509.
[0033] Further, the switch 513 is electrically connected with the ignition head 514.
[0034] Further, the switch 513 is arranged on the middle part of the outer side of the ignition box 509, and when the deflagration is generated in the ignition box 509, the switch 513 provides buffer for opening the pressure relief valve 517.
[0035] The device is used to deal with harmful particles and purify methane that the exhaust gas may carry, and solves the problem of possible methane residues in the exhaust gas. In actual operation, when the device is used, the user introduces the exhaust gas from the exhaust gas pipeline 1 into the sleeve 401, and then the user starts the motor 406. When the motor 406 outputs, the exhaust gas is drawn out from the inside of the sleeve 401 by the flow guide fan blade 407. The exhaust gas passes through the water from the bottom of the filter kettle 2 to the water surface. The methane in the exhaust gas will float up first due to its density. The flow guide fan blade 407 guides the exhaust gas at the top of the filter kettle 2 into the gathering kettle 408. The methane will accumulate inside the gathering kettle 408. The user starts the motor 503. When the motor 503 outputs, the exhaust gas inside the gathering kettle 408 is drawn into the ignition box 509. The counterweight 512 can increase the gas pressure inside the ignition box 509, thereby increasing the density. After the exhaust gas accumulates inside the ignition box 509, the counterweight 512 will be in contact with the switch 513. At this time, the ignition head 514 is supplied with power. When the concentration of exhaust gas inside the ignition kettle is greater than 5%, it will be ignited. At this time, the pressure inside the ignition box 509 will increase instantaneously, and the partition plate 510 will be continuously lifted. At this time, the pressure inside the ignition box 509 will trigger the pressure protection valve 516 to temporarily close the passage and the pressure relief valve 517 will discharge the steam after the exhaust gas is burned. When the exhaust gas inside the ignition box 509 is not enough to ignite, the exhaust gas will be continuously pushed by the air supply fan blade 504 to the bottom of the purification kettle 3 for filtering out methane.
[0036] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element(s).
Claims
1. A LNG liquefied natural gas detection exhaust gas purification discharge device, comprising an exhaust pipe (1), a filter kettle (2) fixedly connected on one side of the exhaust pipe (1), and a purification kettle (3) arranged in communication with the filter kettle (2), characterized in that: The low-concentration waste gas filtering mechanism (4) is provided on the right side of the waste gas pipeline (1), and a high-concentration waste gas eliminating mechanism (5) is provided on the upper side of the low-concentration waste gas filtering mechanism (4). The low-concentration waste gas filtering mechanism (4) comprises a sleeve (401) which is in communication with one end of the waste gas pipeline (1), a filtering tube (402) which is in communication with the lower side of the sleeve (401), a transfer tube (403) which is in communication with the upper end of the filtering tube (2), a wind box (404) which is in communication with the middle side of the transfer tube (403), a support (405) which is fixedly connected to the inside of the wind box (404), a motor (406) which is fixedly connected to the inside of the support (405), a flow guide fan blade (407) which is fixedly connected to one end of the motor (406), an aggregation kettle (408) which is in communication with one end of the transfer tube (403), a flow transfer tube (409) which is in communication between the aggregation kettle (408) and a purification kettle (3), and a filter plate (410) which is fixedly connected to the inside of the purification kettle (3).
2. The LNG detection exhaust purification device according to claim 1, characterized in that: The filter plate (410) is provided with a plurality of.
3. The LNG detection exhaust purification device according to claim 1, characterized in that: The diameter of the sleeve (401) is smaller than the diameter of the inner wall of the filtering tube (2).
4. The LNG detection exhaust purification device according to claim 1, characterized in that: The aggregation kettle (408) is provided in a barrel-shaped structure which is narrow at the top and wide at the bottom.
5. The LNG detection exhaust purification device according to claim 1, characterized in that: The high-concentration waste gas eliminating mechanism (5) comprises a wind cylinder (501) which is in communication with the upper end of the aggregation kettle (408), a suspension (502) which is fixedly connected to the inside of the wind cylinder (501), a motor (503) which is fixedly connected to the inside of the suspension (502), a gas feeding fan blade (504) which is fixedly connected to the output end of the motor (503), a branch pipe (505) which is in communication with the upper end of the wind cylinder (501), a stop block (506) which is fixedly connected to the inside of the branch pipe (505), a spring (507) which is fixedly connected to the inside of the stop block (506), a stop ball (508) which is fixedly connected to the lower end of the spring (507), the stop ball (508) being arranged on the inside of the stop block (506), an ignition box (509) which is in communication with the upper end of the branch pipe (505), a partition plate (510) which is sealingly and slidably connected to the inside of the ignition box (509), a limiting rod (511) which is fixedly connected to the outside of the partition plate (510) and slidably connected to the inside of the ignition box (509), a counterweight (512) which is fixedly connected to the lower end of the limiting rod (511), a switch (513) which is arranged on one side of the ignition box (509), an ignition head (514) which is fixedly connected to the upper side of the inner wall of the ignition box (509), a backflow pipe (515) which is in communication between the purification kettle (3) and the aggregation kettle (408), a pressure protection valve (516) which is in communication with the inside of the backflow pipe (515), and a pressure relief valve (517) which is in communication with the bottom of the ignition box (509).
6. The LNG detection exhaust purification device according to claim 5, characterized in that: The switch (513) is electrically connected to the ignition head (514).
7. The LNG detection exhaust purification device according to claim 5, characterized in that: The switch (513) is arranged on the middle part of the outside of the ignition box (509).