CN114106895B - Hot-blowing dry type natural gas moisture mercury removal device and method - Google Patents
Hot-blowing dry type natural gas moisture mercury removal device and method Download PDFInfo
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- CN114106895B CN114106895B CN202010860545.5A CN202010860545A CN114106895B CN 114106895 B CN114106895 B CN 114106895B CN 202010860545 A CN202010860545 A CN 202010860545A CN 114106895 B CN114106895 B CN 114106895B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
Abstract
The invention discloses a device and a method for removing mercury from hot-swept dry natural gas moisture. The hot-blowing dry type natural gas wet gas mercury removal device comprises a mercury removal unit, an anti-mercury removal agent invalidation unit and a gas path control unit; the mercury removal unit is used for removing mercury in the natural gas through a mercury removal agent; the mercury removal prevention agent invalidation unit is connected with the mercury removal unit and is used for repairing the performance of the mercury removal agent in the mercury removal unit; the gas path control unit is used for controlling the natural gas to flow through the routes of the mercury removal unit and the mercury removal agent failure prevention unit; wherein the mercury removal unit comprises at least one mercury removal column; and the mercury removal prevention agent invalidation units are connected with the at least one mercury removal tower in a one-to-one correspondence manner and comprise at least one mercury removal prevention agent invalidation device. The invention also provides a method for removing mercury from the hot-swept dry natural gas moisture. The device and the method for removing mercury from the hot-blowing dry natural gas by moisture are simple and flexible, and do not harm the production safety and prevent the mercury removing agent from unexpected failure.
Description
Technical Field
The invention relates to the technical field of natural gas moisture mercury removal. And more particularly to a hot-purge dry natural gas moisture mercury removal apparatus and method.
Background
In the process of natural gas gathering and transportation, various process treatments are needed to be carried out on the natural gas raw gas so as to remove various impurities in the raw gas. Where removal of common materials including mercury, hydrogen sulfide, water, light hydrocarbons, carbon dioxide, various solid impurities, and the like is required. Different processes are sometimes interfered with each other because different processes are required to remove different impurities.
In the mercury removal process, mercury removal is generally carried out at the tail end of a treatment plant so as to prevent the mercury removal agent from unexpected failure due to impurities in the raw gas and ensure the safety and qualification of the external gas transmission. But its front end can reduce the saturated mercury vapor concentration in the feed gas due to the presence of other processes, such as low temperature dehydration and cryogenic dealkylation, resulting in a significant amount of mercury condensation that remains in the equipment of the treatment process. These residual mercury in the equipment can react with the metal in the equipment to form amalgams, damage the equipment causing major accidents and also threatening production safety and health of the operators. If the front-end mercury removal is adopted in the treatment process, because the mercury removal adsorbent is adopted in the existing mercury removal process for adsorption, a large amount of liquid hydrocarbon liquid water impurities in the natural gas raw gas can block the pores of the mercury removal adsorbent, so that the performance of the mercury removal agent is drastically reduced, the mercury content of the external gas is severely exceeded, and the requirements of natural gas mercury removal cannot be met. The prior front-end mercury removal equipment simply comprises front-end equipment of a rear-end process, and is not suitable for the front-end mercury removal related transformation. Therefore, it is urgent to design a hot-purge dry natural gas moisture mercury removal device and method that is simple and flexible, does not jeopardize production safety and prevents accidental failure of the mercury removal agent.
Therefore, the invention provides a device and a method for removing mercury from hot-swept dry natural gas moisture, which solve the problems.
Disclosure of Invention
The invention aims to provide a hot-blowing dry type natural gas moisture mercury removal device and method which are simple and flexible, do not harm production safety and prevent unexpected failure of mercury removal agent, and greatly reduce the current production safety hidden trouble and natural gas production cost.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the hot-blowing dry type natural gas wet gas mercury removal device comprises a mercury removal unit, an anti-mercury removal agent invalidation unit and a gas circuit control unit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the mercury removal unit is used for removing mercury in the natural gas through a mercury removal agent;
the mercury removal prevention agent invalidation unit is connected with the mercury removal unit and is used for repairing the performance of the mercury removal agent in the mercury removal unit;
the gas path control unit is used for controlling the natural gas to flow through the routes of the mercury removal unit and the mercury removal agent failure prevention unit.
Preferably, the mercury removal unit comprises at least one mercury removal column.
Preferably, the mercury removal agent failure unit comprises at least one mercury removal agent failure device, which is connected with the at least one mercury removal tower in a one-to-one correspondence.
Preferably, the mercury removal prevention agent failure device comprises a heater, a circulating pump and a refrigerator; wherein, the liquid crystal display device comprises a liquid crystal display device,
the air outlet of the heater is connected with the air inlet of the circulating pump, and the heater is used for providing hot air for heating the mercury removal agent in the mercury removal unit for the mercury removal unit;
the gas outlet of the circulating pump is connected with the gas inlet of the mercury removal unit, the circulating pump is used for inputting hot gas output by the heater into the mercury removal unit, and liquid hydrocarbon and liquid water blocked in the mercury removal agent pore space in the mercury removal unit are evaporated;
the air inlet of the refrigerator is connected with the air outlet of the mercury removal unit, the air outlet of the refrigerator is connected with the air inlet of the heater, and the refrigerator is used for condensing hot gas output by the mercury removal unit and condensing liquid hydrocarbon and liquid water in the hot gas.
Preferably, the mercury removal preventing agent invalidation device further comprises a condensate recovery tank, and a liquid inlet of the condensate recovery tank is connected with a liquid outlet of the refrigerator and is used for recovering condensed liquid in the refrigerator.
Preferably, the mercury removal failure prevention device further comprises a heat exchanger connected with the mercury removal unit, the refrigerator and the heater, and the heat exchanger is used for precooling hot gas output by the mercury removal unit by using cold gas output by the refrigerator and preheating cold gas output by the refrigerator by using hot gas output by the mercury removal unit.
Preferably, the heating temperature of the heater is 70-100 ℃.
Preferably, the refrigerating temperature of the refrigerator is 1-4 ℃.
Preferably, gas pipelines in the heat exchanger, the refrigerator and the heater are respectively made of red copper.
Preferably, the mercury removal unit comprises a first mercury removal column and a second mercury removal column which are connected with each other; the first mercury removal tower and the second mercury removal tower are controlled by the gas circuit control unit to be double-tower serial mercury removal or double-tower parallel mercury removal.
Preferably, the mercury-removal prevention agent failure unit comprises a first mercury-removal prevention agent failure device and a second mercury-removal prevention agent failure device; the first mercury removal agent invalidation device is connected with the first mercury removal tower and is used for repairing the performance of mercury removal agent in the first mercury removal tower; the second mercury removal agent invalidation device is connected with the second mercury removal tower and is used for repairing the performance of the mercury removal agent in the second mercury removal tower.
Preferably, the first mercury removal prevention agent failure device comprises a first heater, a first circulating pump and a first refrigerator; the second mercury removal prevention agent failure device comprises a second heater, a second circulating pump and a second refrigerator.
Preferably, the first mercury removal prevention agent failure device further comprises a first condensate recovery tank; the second mercury removal prevention agent invalidation device further comprises a second condensate recovery tank.
Preferably, the first mercury removal prevention means further comprises a first heat exchanger; the second mercury-removal prevention means further comprises a second heat exchanger.
Preferably, the gas path control unit comprises a pipeline group and a valve group arranged on the pipeline group, and the opening and closing of the valve group is used for controlling the flow paths of the natural gas in the mercury removal unit and the mercury removal agent failure prevention unit.
Preferably, the pipeline group comprises:
the air inlet of the air inlet pipeline is connected with natural gas;
an air outlet pipeline, wherein the natural gas after mercury removal is discharged through an air outlet of the air outlet pipeline;
one end of the first pipeline group is connected with the air outlet of the air inlet pipeline, and the other end of the first pipeline group is connected with the air inlet of the mercury removal unit;
one end of the second pipeline group is connected with the air outlet of the mercury removal unit, and the other end of the second pipeline group is connected with the air inlet of the air outlet pipeline;
one end of the third pipeline group is connected with the air inlet of the mercury removal unit, and the other end of the third pipeline group is connected with the air outlet of the mercury removal unit;
one end of the fourth pipeline group is connected with the first pipeline group, and the other end of the fourth pipeline group is connected with the air outlet of the mercury removal prevention agent failure unit;
And one end of the fifth pipeline group is connected with the second pipeline group, and the other end of the fifth pipeline group is connected with the air inlet of the mercury removal prevention agent failure unit.
Preferably, the line set further comprises a sixth line set connecting the in-unit device for preventing mercury removal.
Preferably, the pipeline group further comprises a seventh pipeline group and an eighth pipeline group, wherein one end of the seventh pipeline group is connected with the fourth pipeline group respectively, and the other end of the seventh pipeline group is connected with a nitrogen source respectively.
Preferably, the first pipeline group comprises a first pipeline a and a first pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the first pipeline A is connected with an air outlet of the air inlet pipeline, and the other end of the first pipeline A is connected with an air inlet of the first mercury removal tower;
one end of the first pipeline B is connected with the air outlet of the air inlet pipeline, and the other end of the first pipeline B is connected with the air inlet of the second mercury removal tower.
Preferably, the second pipeline group comprises a second pipeline a and a second pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the second pipeline A is connected with the air outlet of the first mercury removal tower, and the other end of the second pipeline A is connected with the air inlet of the air outlet pipeline;
One end of the second pipeline B is connected with the air outlet of the second mercury removal tower, and the other end of the second pipeline B is connected with the air inlet of the air outlet pipeline.
Preferably, the third pipeline group comprises a third pipeline a and a third pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the third pipeline A is connected with the air inlet of the first mercury removal tower through the first pipeline A, and the other end of the third pipeline A is connected with the air outlet of the second mercury removal tower through the second pipeline B;
one end of the third pipeline B is connected with the air inlet of the second mercury removal tower through the first pipeline B, and the other end of the third pipeline B is connected with the air outlet of the first mercury removal tower through the second pipeline A.
Preferably, the fourth pipeline group includes a fourth pipeline a and a fourth pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the fourth pipeline A is connected with the first pipeline A, and the other end of the fourth pipeline A is connected with an air outlet of the first mercury removal prevention agent invalidation device;
one end of the fourth pipeline B is connected with the first pipeline B, and the other end of the fourth pipeline B is connected with an air outlet of the second mercury removal prevention agent invalidation device.
Preferably, the fifth pipeline group comprises a fifth pipeline a and a fifth pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
One end of the fifth pipeline A is connected with the second pipeline A, and the other end of the fifth pipeline A is connected with an air inlet of the first mercury removal prevention agent invalidation device;
one end of the fifth pipeline B is connected with the second pipeline B, and the other end of the fifth pipeline B is connected with an air inlet of the second mercury removal prevention agent invalidation device.
Preferably, the seventh pipeline group includes a seventh pipeline a and a seventh pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the seventh pipeline A is connected with the fourth pipeline A, and the other end of the seventh pipeline A is connected with a nitrogen source;
one end of the seventh pipeline B is connected with the fourth pipeline B, and the other end of the seventh pipeline B is connected with a nitrogen source.
Preferably, the eighth pipeline group includes an eighth pipeline a and an eighth pipeline B; wherein, the liquid crystal display device comprises a liquid crystal display device,
one end of the eighth pipeline A is connected with the fourth pipeline A, and nitrogen is output from the other end of the eighth pipeline A;
one end of the eighth pipeline B is connected with the fourth pipeline B, and nitrogen is output from the other end of the eighth pipeline B.
Preferably, the valve group comprises:
the first valve group is arranged at one end of the first pipeline group, which is close to the air outlet of the air inlet pipeline, and the second valve group is arranged between the joint of the first pipeline group and the third pipeline group and the joint of the first pipeline group and the fourth pipeline group;
A third valve group arranged on the second pipeline group;
a fourth valve group and a fifth valve group which are arranged on the third pipeline group, wherein the fourth valve group is arranged at one end of the third pipeline group, which is close to the air inlet of the mercury removal unit, and the fifth valve group is arranged at one end of the third pipeline group, which is close to the air outlet of the mercury removal unit;
a sixth valve group disposed on the fourth pipeline group;
and a seventh valve group arranged on the fifth pipeline group.
Preferably, the valve group further comprises:
an eighth valve group provided on the seventh pipeline group; and
and a ninth valve group arranged on the eighth pipeline group.
Preferably, the valve group further comprises:
and a tenth valve group arranged on the fourth pipeline group and positioned between the seventh pipeline group and the eighth pipeline group.
Preferably, the first valve group comprises a first valve a and a first valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first valve A is arranged at one end of the first pipeline A, which is close to the air outlet of the air inlet pipeline;
the first valve B is arranged at one end of the first pipeline B, which is close to the air outlet of the air inlet pipeline.
Preferably, the second valve group comprises a second valve a and a second valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the second valve A is arranged at one end of the first pipeline A, which is close to the air inlet of the first mercury removal tower; the joint of the fourth pipeline and the first pipeline is arranged between the first valve A and the second valve A; the joint of the third pipeline A and the first pipeline A is arranged between the second valve A and the inlet of the first mercury removal tower;
The second valve B is arranged at one end of the first pipeline B, which is close to the air inlet of the first mercury removal tower; the joint of the fourth pipeline B and the first pipeline B is arranged between the first valve B and the second valve B; the joint of the third pipeline B and the first pipeline B is arranged between the second valve B and the inlet of the first mercury removal tower.
Preferably, the third valve group comprises a third valve a and a third valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the third valve A is arranged on the second pipeline A; the joint of the fifth pipeline A and the second pipeline A is arranged between the joint of the third pipeline B and the second pipeline A and the third valve A;
the third valve B is arranged on the second pipeline B; the connection part of the fifth pipeline B and the second pipeline B is arranged between the connection part of the third pipeline A and the second pipeline B and the third valve B.
Preferably, the fourth valve group comprises a fourth valve a and a fourth valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the fourth valve A is arranged at one end of the third pipeline A, which is close to the air inlet of the first mercury removal tower;
and the fourth valve B is arranged at one end of the third pipeline B, which is close to the air inlet of the second mercury removal tower.
Preferably, the fifth valve group comprises a fifth valve a and a fifth valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the fifth valve A is arranged at one end of the third pipeline B, which is close to the air outlet of the first mercury removal tower;
and the fifth valve B is arranged at one end of the third pipeline A, which is close to the air outlet of the second mercury removal tower.
Preferably, the sixth valve group comprises a sixth valve a and a sixth valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the sixth valve A is arranged on the fourth pipeline A;
the sixth valve B is arranged on the fourth pipeline B.
Preferably, the seventh valve group comprises a seventh valve a and a seventh valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the seventh valve A is arranged on the fifth pipeline A;
the seventh valve B is arranged on the fifth pipeline B.
Preferably, the eighth valve group includes an eighth valve a and an eighth valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the eighth valve A is arranged on the seventh pipeline A;
the eighth valve B is arranged on the seventh pipeline B.
Preferably, the ninth valve group comprises a ninth valve a and a ninth valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
the ninth valve A is arranged on the eighth pipeline A;
the ninth valve B is arranged on the eighth pipeline B.
Preferably, the tenth valve group includes a tenth valve a and a tenth valve B; wherein, the liquid crystal display device comprises a liquid crystal display device,
The tenth valve A is arranged on the fourth pipeline A and is positioned between the connection part of the seventh pipeline A and the fourth pipeline A and the connection part of the eighth pipeline A and the fourth pipeline A;
the tenth valve B is arranged on the fourth pipeline B and is positioned between the connection part of the seventh pipeline B and the fourth pipeline B and the connection part of the eighth pipeline B and the fourth pipeline B.
As another aspect of the invention, the invention also provides a hot-blowing dry type natural gas wet gas mercury removal method using the device, which comprises a multi-tower serial mercury removal method and a multi-tower parallel mercury removal method.
Preferably, when the performance of the single mercury removal tower fails unexpectedly, the multi-tower serial mercury removal method or the multi-tower parallel mercury removal method further comprises the steps of maintaining the single mercury removal tower and removing mercury from the rest mercury removal towers, and specifically comprises the following steps:
the natural gas is controlled by the gas path control unit to enter the mercury removal unit, a single mercury removal tower which is invalid in the mercury removal unit uses a correspondingly connected mercury removal agent invalidation device to carry out mercury removal agent maintenance, and the rest mercury removal towers carry out multi-tower serial mercury removal or multi-tower parallel mercury removal.
Preferably, when the performance of the multiple mercury removal towers fails unexpectedly, the multi-tower serial mercury removal method or the multi-tower parallel mercury removal method further comprises the steps of maintaining the multiple mercury removal towers and removing mercury from the rest mercury removal towers, and specifically comprises the following steps:
The natural gas is controlled by the gas circuit control unit to enter the mercury removal unit, a plurality of mercury removal towers which are invalid in the mercury removal unit use a plurality of mercury removal agent invalidation devices which are correspondingly connected to carry out mercury removal agent maintenance, and the rest mercury removal towers carry out multi-tower serial mercury removal or multi-tower parallel mercury removal.
Preferably, when all the mercury removal towers fail unexpectedly, the multi-tower serial mercury removal method or the multi-tower parallel mercury removal method further comprises the step of maintaining all the mercury removal towers, and specifically comprises the following steps:
and the natural gas is controlled to enter the mercury removal unit by the gas circuit control unit, and all the multiple mercury removal towers which are invalid in the mercury removal unit use the multiple mercury removal agent invalidation devices which are correspondingly connected to carry out mercury removal agent maintenance.
Preferably, the spent mercury removal column further comprises a nitrogen substitution step prior to mercury removal maintenance using a correspondingly connected mercury removal prevention disabling means.
Preferably, the multi-tower serial mercury removal method comprises the following steps:
the natural gas is controlled by the gas circuit control unit to enter a plurality of mercury removal towers in the mercury removal unit in sequence to remove mercury, and the natural gas after mercury removal by the last mercury removal tower is discharged.
Preferably, the multi-tower parallel mercury removal method comprises the following steps:
the natural gas is controlled by the gas circuit control unit to enter a plurality of mercury removal towers in the mercury removal unit for mercury removal, and the natural gas after mercury removal by the mercury removal towers is discharged.
Preferably, when the mercury removal tower uses the mercury removal agent invalidation device to maintain the mercury removal agent, the natural gas in the mercury removal tower and the mercury removal agent invalidation device flows to the mercury removal tower, the heat exchanger, the refrigerator, the heater, the circulating pump and the mercury removal tower in sequence to form closed circulation, so that the maintenance of the mercury removal agent in the mercury removal tower is completed.
Preferably, the multi-tower serial mercury removal method is a double-tower serial mercury removal method, and the double-tower serial mercury removal method comprises the following steps:
natural gas enters a first mercury removal tower for mercury removal, natural gas subjected to mercury removal by the first mercury removal tower enters a second mercury removal tower, and natural gas subjected to mercury removal by the second mercury removal tower is discharged;
or alternatively, the process may be performed,
the natural gas enters a second mercury removal tower for mercury removal, the natural gas subjected to mercury removal by the second mercury removal tower enters a first mercury removal tower, and the natural gas subjected to mercury removal by the first mercury removal tower is discharged.
Preferably, the double-tower serial mercury removal method specifically comprises the following steps:
opening a first valve A, a second valve A, a fifth valve A, a fourth valve B and a third valve B, closing the rest valves, enabling natural gas to enter a first pipeline A from an air inlet pipeline, enabling the natural gas to enter a first mercury removal tower for mercury removal, enabling the natural gas subjected to mercury removal through the first mercury removal tower to enter a second mercury removal tower from a third pipeline B, enabling the natural gas subjected to mercury removal through the second mercury removal tower to enter an air outlet pipeline from a second pipeline B, and discharging the natural gas through an air outlet pipeline;
Or alternatively, the process may be performed,
and opening a first valve B, a second valve B, a fifth valve B, a fourth valve A and a third valve A, closing the rest valves, enabling natural gas to enter a first pipeline B from an air inlet pipeline, enabling the natural gas to enter a second mercury removal tower for mercury removal, enabling the natural gas subjected to mercury removal through the second mercury removal tower to enter the first mercury removal tower through a third pipeline A, enabling the natural gas subjected to mercury removal through the first mercury removal tower to enter an air outlet pipeline through a second pipeline A, and discharging the natural gas through an air outlet pipeline.
Preferably, the multi-tower parallel mercury removal method is a double-tower parallel mercury removal method, and the double-tower parallel mercury removal method comprises the following steps:
natural gas enters a first mercury removal tower and a second mercury removal tower respectively for mercury removal, and the natural gas after mercury removal by the first mercury removal tower and mercury removal by the second mercury removal tower is discharged.
Preferably, the double-tower parallel mercury removal method comprises the following steps:
and opening a first valve A, a second valve A, a third valve A, a first valve B, a second valve B and a third valve B, closing the rest valves, enabling natural gas to enter a first pipeline A and a first pipeline B respectively through an air inlet pipeline, enabling the natural gas to enter a first mercury removal tower and a second mercury removal tower respectively for mercury removal, enabling the natural gas after mercury removal through the first mercury removal tower and mercury removal through the second mercury removal tower to enter an air outlet pipeline respectively through a second pipeline A and a second pipeline B, and enabling the natural gas to be discharged through an air outlet pipeline.
Preferably, when the mercury removal performance of the first mercury removal tower fails unexpectedly, the double-tower serial mercury removal method or the double-tower parallel mercury removal method further comprises a step of single-tower mercury removal single-tower maintenance, which specifically comprises the following steps:
and opening a first valve B, a second valve B, a third valve B, a second valve A, a sixth valve A, a seventh valve A and a tenth valve A, closing the rest valves, and normally removing mercury from the second mercury removal tower, wherein the first mercury removal tower uses a first mercury removal agent failure prevention device to maintain mercury removal agents.
Preferably, when the mercury removal performance of the second mercury removal tower fails unexpectedly, the double-tower serial mercury removal method or the double-tower parallel mercury removal method further comprises a step of single-tower mercury removal single-tower maintenance, which specifically comprises the following steps:
and opening a first valve A, a second valve A, a third valve A, a second valve B, a sixth valve B, a seventh valve B and a tenth valve B, closing the rest valves, and normally removing mercury from the first mercury removal tower, wherein the second mercury removal tower uses a second mercury removal agent failure prevention device to maintain mercury removal agents.
Preferably, when the mercury removal performance of the first mercury removal tower and the second mercury removal tower is unexpected failure, the double-tower serial mercury removal method or the double-tower parallel mercury removal method further comprises a double-tower maintenance step, which specifically comprises:
And opening a second valve A, a sixth valve A, a seventh valve A, a second valve B, a sixth valve B, a seventh valve B, a tenth valve A and a tenth valve B, and closing the rest valves, wherein the first mercury removal tower uses a first mercury removal failure prevention device for mercury removal maintenance, and the second mercury removal tower uses a second mercury removal failure prevention device for mercury removal maintenance.
Preferably, when the first mercury removal tower uses the first mercury removal agent failure device to perform mercury removal agent maintenance, the flow directions of the natural gas in the first mercury removal tower and the first mercury removal agent failure device are sequentially the first mercury removal tower, the first heat exchanger, the first refrigerator, the first heat exchanger, the first heater, the first circulating pump and the first mercury removal tower, so that closed circulation is formed, and maintenance of the mercury removal agent in the first mercury removal tower is completed.
Preferably, before the first mercury removal column uses the first mercury removal agent failure device to perform mercury removal maintenance, the method further comprises the step of performing nitrogen replacement on the first mercury removal column and the first mercury removal agent failure device.
Preferably, the step of performing nitrogen replacement by the first mercury removal tower and the first mercury removal prevention agent invalidation device specifically includes:
and opening a second valve A, a sixth valve A, a seventh valve A, an eighth valve A and a ninth valve A, closing the tenth valve A, and allowing nitrogen to enter through an eighth pipeline A, wherein the flow direction of the nitrogen is sequentially a first mercury removal tower, a first heat exchanger, a first refrigerator, a first heat exchanger, a first heater and a first circulating pump, and the nitrogen is discharged through the ninth pipeline A.
Preferably, when the second mercury removal tower uses the second mercury removal agent failure device to perform mercury removal agent maintenance, the flow directions of the natural gas in the second mercury removal tower and the second mercury removal agent failure device are the second mercury removal tower, the second heat exchanger, the second refrigerator, the second heater, the second circulating pump and the second mercury removal tower in sequence, so that closed circulation is formed, and maintenance of the mercury removal agent in the second mercury removal tower is completed.
Preferably, before the second mercury removal column uses the second mercury removal agent failure device to perform mercury removal maintenance, the method further comprises the step of performing nitrogen replacement on the second mercury removal column and the second mercury removal agent failure device.
Preferably, the step of performing nitrogen replacement by the second mercury removal tower and the second mercury removal agent failure device specifically includes:
and opening a second valve B, a sixth valve B, a seventh valve B, an eighth valve B and a ninth valve B, closing the tenth valve B, and allowing nitrogen to enter through an eighth pipeline B, wherein the flow direction of the nitrogen is sequentially a second mercury removal tower, a second heat exchanger, a second refrigerator, a second heat exchanger, a second heater and a second circulating pump, and the nitrogen is discharged through the ninth pipeline B.
The beneficial effects of the invention are as follows:
the hot-blowing dry type natural gas wet gas mercury removal device and the method provided by the invention can be flexibly applied according to the requirements of a natural gas production site; the mercury in the natural gas can be removed in the wet gas, so that the mercury content in the natural gas meets the standard; the mercury removal agent can be prevented from being accidentally failed due to condensate, and the mercury removal performance of the mercury removal agent can be recovered after the mercury removal agent is accidentally failed; gravity can be utilized to automatically collect liquid hydrocarbon and liquid water to enter a condensate recovery tank.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows a schematic diagram of a hot-purge dry natural gas moisture mercury removal apparatus provided by the present invention;
wherein 101-the inlet line, 102-the first line A, 103-the first line B, 104-the second line A, 105-the second line B, 106-the third line A, 107-the third line B, 108-the fourth line A, 109-the fourth line B, 110-the fifth line A, 111-the fifth line B, 112-the seventh line A, 113-the seventh line B, 114-the eighth line A, 115-the eighth line B, 116-the outlet line, 201-the first mercury-release-preventing means, 202-the second mercury-release-preventing means, 1-the first valve A, 2-the first valve B, 3-the sixth valve A, 4-the sixth valve B, 5-the second valve A, 6-the second valve B, 7-fourth valve A, 8-fourth valve B, 9-eighth valve A, 10-eighth valve B, 11-ninth valve A, 12-ninth valve B, 13-seventh valve A, 14-seventh valve B, 15-fifth valve A, 16-fifth valve B, 17-third valve A, 18-third valve B, 19-first circulation pump, 20-second circulation pump, 21-first heater, 22-second heater, 23-first mercury removal column, 24-second mercury removal column, 25-first refrigerator, 26-second refrigerator, 27-first heat exchanger, 28-second heat exchanger, 29-first condensate recovery tank, 30-second condensate recovery tank, 31-tenth valve A, 32-tenth valve B.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
The invention provides a hot-blowing dry type natural gas moisture mercury removal device which is simple and flexible, does not harm production safety and prevents unexpected failure of mercury removal agent, and greatly reduces the current production safety hidden trouble and natural gas production cost.
Specifically, the invention provides a hot-blowing dry type natural gas moisture mercury removal device, which comprises a mercury removal unit, an anti-mercury removal agent invalidation unit and a gas path control unit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the mercury removal unit is used for removing mercury in the natural gas through a mercury removal agent;
the mercury removal prevention agent invalidation unit is connected with the mercury removal unit and is used for repairing the performance of the mercury removal agent in the mercury removal unit;
the gas path control unit is used for controlling the natural gas to flow through the routes of the mercury removal unit and the mercury removal agent failure prevention unit.
As a preferred embodiment of the invention, the mercury removal unit comprises at least one mercury removal column, and multi-column series or parallel mercury removal can be achieved.
As a preferred embodiment of the present invention, the mercury removal prevention agent invalidation unit is connected to the at least one mercury removal tower in a one-to-one correspondence manner, and comprises at least one mercury removal prevention agent invalidation device; wherein each mercury removal agent invalidation device is correspondingly connected with one mercury removal tower, and the performance of mercury removal agent in the mercury removal tower is restored.
As a preferred embodiment of the present invention, the mercury removal prevention means includes a heater, a circulation pump, and a refrigerator; wherein, the liquid crystal display device comprises a liquid crystal display device,
the air outlet of the heater is connected with the air inlet of the circulating pump, and the heater is used for providing hot air for heating the mercury removal agent in the mercury removal unit for the mercury removal unit; wherein the heating temperature of the heater is preferably 70-100 ℃.
The gas outlet of the circulating pump is connected with the gas inlet of the mercury removal unit, the circulating pump is used for inputting hot gas output by the heater into the mercury removal unit, and liquid hydrocarbon and liquid water blocked in the mercury removal agent pore space in the mercury removal unit are evaporated;
the air inlet of the refrigerator is connected with the air outlet of the mercury removal unit, the air outlet of the refrigerator is connected with the air inlet of the heater, and the refrigerator is used for condensing hot air output by the mercury removal unit and condensing liquid hydrocarbon and liquid water in the hot air; wherein, the refrigeration temperature of the refrigerator is preferably 1-4 ℃.
Further, the mercury removal prevention agent invalidation device further comprises a condensate recovery tank, and a liquid inlet of the condensate recovery tank is connected with a liquid outlet of the refrigerator and is used for recovering condensed liquid in the refrigerator.
Further, the mercury removal failure prevention device further comprises a heat exchanger for precooling hot gas output through the mercury removal unit by using cold gas from the refrigerator.
FIG. 1 illustrates a hot purge dry natural gas moisture mercury removal apparatus in accordance with an embodiment of the present invention; specifically, the hot purge drying type natural gas moisture mercury removal device in fig. 1 comprises a mercury removal unit, an anti-mercury removal agent failure unit and a gas path control unit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the gas path control unit comprises a pipeline group and a valve group arranged on the pipeline group, and controls the flow path of natural gas through opening and closing of the valve group;
the line group includes an intake line 101, an exhaust line 116, a first line a 102, a first line B103, a second line a 104, a second line B105, a third line a 106, a third line B107, a fourth line a 108, a fourth line B109, a fifth line a 110, a fifth line B111, and a sixth line group;
the pipeline set further includes: a seventh pipeline A112 with one end connected with the fourth pipeline A108 and the other end connected with a nitrogen source; a seventh pipeline B113, one end of which is connected with the fourth pipeline B109, and the other end of which is connected with a nitrogen source; an eighth pipeline A114 with one end connected with the fourth pipeline A108 and the other end connected with a nitrogen source; and an eighth pipeline B115, one end of which is connected with the fourth pipeline B108, and the other end of which is connected with a nitrogen source.
As in fig. 1, the mercury removal unit comprises a first mercury removal column 23 and a second mercury removal column 24 connected to each other; the air inlet of the first mercury removal column 23 is connected to the air inlet line 101 via a first line a 102; the air inlet of the second mercury removal column 24 is connected to the air inlet line 101 via a first line B103; the air outlet of the first mercury removal column 23 is connected with an air outlet pipeline 116 through a second pipeline A104; the gas outlet of the second mercury removal column 24 is connected to a gas outlet line 116 via a second line B105; the air inlet of the first mercury removal column 23 is connected with the air outlet of the second mercury removal column 24 through a third pipeline A106; the gas outlet of the first demercuration tower 23 is connected with the gas inlet of the second demercuration tower 24 through a third pipeline B107.
As shown in fig. 1, the mercury-removal prevention agent failure unit includes a first mercury-removal prevention agent failure device 201 and a second mercury-removal prevention agent failure device 202; the first mercury removal prevention agent invalidation device 201 is connected with the first mercury removal column 23 through a fourth pipeline A108 and is used for repairing the performance of mercury removal agent in the first mercury removal column 23; the second mercury removal prevention means 202 is connected to the second mercury removal column 24 via a fourth line B109, and is used for repairing the performance of the mercury removal agent in the second mercury removal column 24; each device in the first mercury removal prevention agent failure device 201 and the second mercury removal prevention agent failure device 202 is connected through a sixth pipeline group.
As shown in fig. 1, the first mercury-removal prevention means 201 comprises a first heater 21, a first circulation pump 19, a first refrigerator 25, a first condensate recovery tank 29, and a first heat exchanger 27; the first circulation pump 19 is connected to the first line a through the fourth line a; wherein, the liquid crystal display device comprises a liquid crystal display device,
the air outlet of the first heater 21 is connected with the air inlet of the first circulating pump 19, and the first heater 21 is used for providing hot air for heating the mercury removal agent in the first mercury removal tower 23 to the first mercury removal tower 23;
the air outlet of the first circulating pump 19 is connected with the air inlet of the first mercury removal tower 23, the first circulating pump 19 is used for inputting the hot air output by the first heater 21 into the first mercury removal tower 23, and evaporating the liquid hydrocarbon and the liquid water blocked in the mercury removal agent pores in the first mercury removal tower 23;
the air inlet of the first refrigerator 25 is connected with the air outlet of the first mercury removal tower 23, the air outlet of the first refrigerator 25 is connected with the air inlet of the first heater 21, and the first refrigerator 25 is used for condensing the hot air output by the first mercury removal tower 23 and condensing liquid hydrocarbon and liquid water in the hot air;
the liquid inlet of the first condensate recovery tank 29 is connected to the liquid outlet of the first refrigerator 25, and is used for recovering the condensed liquid in the first refrigerator 25;
When the hot gas of the first mercury removal tower 23 enters the first refrigerator 25, precooling the hot gas in the first heat exchanger 27 by using cold gas which is about to enter the first heater 21 after condensation is completed; in contrast, the cold air is preheated in the first heat exchanger 27 by the hot gas discharged from the first mercury removal column 23 before entering the first heater 21.
As shown in fig. 1, the second mercury removal prevention means includes a second heater 22, a second circulation pump 20, a second refrigerator 26, a second condensate recovery tank 30, and a second heat exchanger 28; the second circulation pump 20 is connected to the first line B103 through a fourth line B109; wherein, the liquid crystal display device comprises a liquid crystal display device,
the air outlet of the second heater 22 is connected with the air inlet of the second circulating pump 20, and the second heater 22 is used for providing hot air for heating the mercury removal agent in the second mercury removal tower 24 to the second mercury removal tower 24;
the air outlet of the second circulating pump 20 is connected with the air inlet of the second mercury removal tower 24, the second circulating pump 20 is used for inputting the hot air output by the second heater 22 into the second mercury removal tower 24, and evaporating the liquid hydrocarbon and the liquid water blocked in the mercury removal agent pores in the second mercury removal tower 24;
the air inlet of the second refrigerator 26 is connected with the air outlet of the second mercury removal tower 24, the air outlet of the second refrigerator 26 is connected with the air inlet of the second heater 22, and the second refrigerator 26 is used for condensing the hot air output by the second mercury removal tower 24 and condensing liquid hydrocarbon and liquid water therein;
The liquid inlet of the second condensate recovery tank 30 is connected to the liquid outlet of the second refrigerator 26, and is used for recovering the condensed liquid in the second refrigerator 26;
the second heat exchanger 28 is used for precooling the hot gas output through the second mercury removal column 24 by using the cold gas from the second refrigerator 26.
Precooling the hot gas in the second heat exchanger 28 with cold gas immediately after condensation is completed, which enters the second heater 22, before the hot gas in the second mercury removal column 24 enters the second refrigerator 26; in contrast, the cold air is preheated in the second heat exchanger 28 by the hot gas exiting the second mercury removal column 24 before entering the second heater 22.
As shown in fig. 1, the valve group includes a first valve A1, a first valve B2, a second valve A5, a second valve B6, a third valve a 17, a third valve B18, a fourth valve A7, a fourth valve B8, a fifth valve a 15, a fifth valve B16, a sixth valve A3, a sixth valve B4, a seventh valve a 13, a seventh valve B14, an eighth valve A9, an eighth valve B10, a ninth valve a 11, a ninth valve B12, a tenth valve a 31, and a tenth valve B32; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first valve A1 is arranged at one end of the first pipeline A102 close to the air outlet of the air inlet pipeline 101; the first valve B2 is arranged at one end of the first pipeline B103 close to the air outlet of the air inlet pipeline 101;
The second valve A5 is arranged at one end of the first pipeline A102 close to the air inlet of the first mercury removal tower 23; the connection between the fourth pipeline a 108 and the first pipeline a 102 is arranged between the first valve A1 and the second valve A5; the connection between the third pipeline A106 and the first pipeline A102 is arranged between the second valve A5 and the inlet of the first mercury removal tower 23;
the second valve B6 is arranged at one end of the first pipeline B103 close to the air inlet of the first mercury removal tower 23; the connection between the fourth pipeline B109 and the first pipeline B103 is arranged between the first valve B2 and the second valve B6; the connection between the third pipeline B107 and the first pipeline B103 is arranged between the second valve B6 and the inlet of the first mercury removal tower 23;
the third valve A17 is arranged on the second pipeline A104; the connection between the fifth pipeline A110 and the second pipeline A104 is arranged between the connection between the third pipeline B107 and the second pipeline A104 and the third valve A17;
the third valve B18 is arranged on the second pipeline B105; the connection between the fifth pipeline B111 and the second pipeline B105 is arranged between the connection between the third pipeline A106 and the second pipeline B105 and the third valve B18;
The fourth valve A7 is arranged at one end of the third pipeline A106 close to the air inlet of the first mercury removal tower 23; the fourth valve B8 is disposed at one end of the third pipeline B107 near the air inlet of the second mercury removal column 24;
the fifth valve A15 is arranged at one end of the third pipeline B107 close to the air outlet of the first mercury removal tower 23; the fifth valve B16 is arranged at one end of the third pipeline A106 close to the air outlet of the second mercury removal tower 24;
the sixth valve A3 is disposed at one end of the fourth pipeline a 108 near the first pipeline a 102; the sixth valve B4 is arranged at one end of the fourth pipeline B109, which is close to the first pipeline B103;
the seventh valve A13 is arranged on the fifth pipeline A110; the seventh valve B14 is arranged on the fifth pipeline B111;
the eighth valve A9 is arranged on the seventh pipeline A112; the eighth valve B10 is arranged on the seventh pipeline B113;
the ninth valve A11 is arranged on the eighth pipeline A114; the ninth valve B12 is arranged on the eighth pipeline B115;
the tenth valve a 31 is disposed on the fourth line a 108 and is located between the seventh line a 112 and the eighth line a 114; the tenth valve B32 is disposed on the fourth line B109 and is located between the seventh line B113 and the eighth line B115.
In addition, the invention also provides a hot-blowing dry natural gas wet gas mercury removal method using the device shown in fig. 1, which comprises a double-tower serial mercury removal method and a double-tower parallel mercury removal method.
As a preferred embodiment of the present invention, the double-tower tandem mercury removal method comprises the steps of:
opening a first valve A1, a second valve A5, a fifth valve A15, a fourth valve B8 and a third valve B18, closing the rest valves, enabling natural gas to enter a first pipeline A102 from an air inlet pipeline 101, enabling the natural gas to enter a first mercury removal tower 23 for mercury removal, enabling the natural gas subjected to mercury removal by the first mercury removal tower 23 to enter a second mercury removal tower 24 through a third pipeline B107, enabling the natural gas subjected to mercury removal by the second mercury removal tower 24 to enter an air outlet pipeline 116 through a second pipeline B105, and enabling the natural gas to be discharged by the air outlet pipeline 116;
or alternatively, the process may be performed,
the first valve B2, the second valve B6, the fifth valve B16, the fourth valve A7 and the third valve A17 are opened, the rest valves are closed, natural gas enters the first pipeline B103 from the air inlet pipeline 101, then enters the second mercury removal tower 24 for mercury removal, natural gas after mercury removal by the second mercury removal tower 24 enters the first mercury removal tower 23 from the third pipeline A106, natural gas after mercury removal by the first mercury removal tower 23 enters the air outlet pipeline 116 from the second pipeline A104, and the natural gas is discharged from the air outlet pipeline 116.
As a preferred embodiment of the present invention, the double-tower parallel mercury removal method comprises the steps of:
the first valve A1, the second valve A5, the third valve A17, the first valve B2, the second valve B6 and the third valve B18 are opened, the rest valves are closed, natural gas respectively enters the first pipeline A102 and the first pipeline B103 from the air inlet pipeline 101, then respectively enters the first mercury removal tower 23 and the second mercury removal tower 24 for mercury removal, and natural gas respectively enters the air outlet pipeline 116 from the second pipeline A104 and the second pipeline B105 after mercury removal by the first mercury removal tower 23 and the second mercury removal tower 24 is discharged from the air outlet pipeline 116.
As a preferred embodiment of the present invention, when the mercury removal performance of the first mercury removal column fails unexpectedly, the double-column serial mercury removal method or the double-column parallel mercury removal method further includes a step of single-column mercury removal single-column maintenance, specifically including:
the first valve B2, the second valve B6, the third valve B18, the second valve A5, the sixth valve A3, the seventh valve A13 and the tenth valve A31 are opened, the rest of valves are closed, the second mercury removal tower 24 is normally used for mercury removal, and the first mercury removal tower 23 is used for mercury removal maintenance by using the first mercury removal failure prevention device 201.
As a preferred embodiment of the present invention, when the mercury removal performance of the second mercury removal column fails unexpectedly, the double-column serial mercury removal method or the double-column parallel mercury removal method further includes a step of single-column mercury removal single-column maintenance, specifically including:
and opening the first valve A1, the second valve A5, the third valve A17, the second valve B6, the sixth valve B4, the seventh valve B14 and the tenth valve B32, closing the rest valves, wherein the first mercury removal tower 23 is used for removing mercury normally, and the second mercury removal tower 24 is used for maintaining mercury removal agent by using the second mercury removal agent failure device 202.
As a preferred embodiment of the present invention, when the mercury removal performance of the first mercury removal column and the second mercury removal column is unexpectedly disabled, the double-column serial mercury removal method or the double-column parallel mercury removal method further comprises a double-column maintenance step, specifically comprising:
and opening a second valve A5, a sixth valve A3, a seventh valve A13, a second valve B6, a sixth valve B4, a seventh valve B14, a tenth valve A31 and a tenth valve B32, closing the rest valves, performing mercury removal maintenance by using a first mercury removal failure prevention device 201 in the first mercury removal column 23, and performing mercury removal maintenance by using a second mercury removal failure prevention device 202 in the second mercury removal column 24.
In the above embodiment, when the first mercury removal column 23 uses the first mercury removal failure device 201 to perform mercury removal maintenance, the flow directions of the natural gas in the first mercury removal column 23 and the first mercury removal failure device 201 are sequentially the first mercury removal column 23, the first heat exchanger 27, the first refrigerator 25, the first heat exchanger 27, the first heater 21, the first circulation pump 19, and the first mercury removal column 23, so as to form a closed cycle, thereby completing maintenance of the mercury removal agent in the first mercury removal column.
In addition, before the first mercury removal tower uses the first mercury removal agent failure device to carry out mercury removal agent maintenance, the method further comprises the step of carrying out nitrogen replacement on the first mercury removal tower and the first mercury removal agent failure device; the method specifically comprises the following steps: the second valve A5, the sixth valve A3, the seventh valve a 13, the eighth valve A9 and the ninth valve a 11 are opened, the tenth valve a 31 is closed, nitrogen gas is introduced through the eighth line a 112, and the nitrogen gas flows into the first mercury removal column 23, the first heat exchanger 27, the first refrigerator 25, the first heat exchanger 27, the first heater 21 and the first circulation pump 19 in this order, and is discharged through the ninth line a 114.
In the above embodiment, when the second mercury removal column 24 uses the second mercury removal failure device 202 to perform mercury removal maintenance, the flow directions of the natural gas in the second mercury removal column 24 and the second mercury removal failure device 202 are sequentially the second mercury removal column 24, the second heat exchanger 28, the second refrigerator 26, the second heat exchanger 28, the second heater 22, the second circulation pump 20, and the second mercury removal column 24, so as to form a closed cycle, and complete maintenance of the mercury removal agent in the second mercury removal column.
In addition, before the second mercury removal tower uses the second mercury removal agent failure device to carry out mercury removal agent maintenance, the method further comprises the step of carrying out nitrogen replacement on the second mercury removal tower and the second mercury removal agent failure device; the method specifically comprises the following steps:
the second valve B6, the sixth valve B4, the seventh valve B14, the eighth valve B10 and the ninth valve B12 are opened, the tenth valve B32 is closed, nitrogen gas is introduced through the eighth line B113, and the nitrogen gas flows into the second mercury removal column 24, the second heat exchanger 28, the second refrigerator 26, the second heat exchanger 28, the second heater 22 and the second circulation pump 20 in this order, and is discharged through the ninth line B115.
In summary, the hot-blowing dry type natural gas wet gas mercury removal device and the method provided by the invention realize double-tower serial mercury removal, double-tower parallel mercury removal state, single-tower mercury removal single-tower maintenance and double-tower maintenance by controlling the flow direction of natural gas, and solve the problems that the mercury removal adsorbent is adopted to adsorb a great amount of liquid hydrocarbon liquid water impurities in natural gas raw gas, which can block pores of the mercury removal adsorbent, cause rapid performance reduction of the mercury removal agent, cause serious exceeding of the mercury content of the external gas, and cannot meet the requirements of natural gas mercury removal.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. The hot-blowing dry type natural gas wet gas mercury removal device is characterized by being applied to front-end mercury removal and comprising a mercury removal unit, an anti-mercury removal agent invalidation unit and a gas circuit control unit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the mercury removal unit is used for removing mercury in the natural gas through a mercury removal agent;
the mercury removal prevention agent invalidation unit is connected with the mercury removal unit and is used for repairing the performance of the mercury removal agent in the mercury removal unit;
the gas path control unit is used for controlling the natural gas to flow through the routes of the mercury removal unit and the mercury removal agent failure prevention unit;
wherein the mercury removal unit comprises at least one mercury removal column; the mercury removal prevention agent invalidation units are connected with the at least one mercury removal tower in a one-to-one correspondence manner, and comprise at least one mercury removal prevention agent invalidation device;
the mercury removal prevention agent invalidation device comprises a heater, a circulating pump, a refrigerator and a condensate recovery tank; wherein, the air outlet of the heater is connected with the air inlet of the circulating pump; an air outlet of the circulating pump is connected with an air inlet of the mercury removal unit; an air inlet of the refrigerator is connected with an air outlet of the mercury removal unit, and an air outlet of the refrigerator is connected with an air inlet of the heater; the liquid inlet of the condensate recovery tank is connected with the liquid outlet of the refrigerator;
The refrigerator is used for condensing the hot gas output by the mercury removal unit and condensing liquid hydrocarbon and liquid water in the hot gas; the condensate recovery tank is used for recovering condensed liquid in the refrigerator; the heater is used for providing hot gas for heating the mercury removal agent in the mercury removal unit; the circulating pump is used for inputting the hot gas output by the heater into the mercury removal unit;
the gas path control unit comprises a pipeline group and a valve group arranged on the pipeline group, and controls the flow paths of the natural gas in the mercury removal unit and the mercury removal agent failure prevention unit through opening and closing of the valve group; the pipeline group includes:
the air inlet of the air inlet pipeline is connected with natural gas;
an air outlet pipeline, wherein the natural gas after mercury removal is discharged through an air outlet of the air outlet pipeline;
one end of the first pipeline group is connected with the air outlet of the air inlet pipeline, and the other end of the first pipeline group is connected with the air inlet of the mercury removal unit;
one end of the second pipeline group is connected with the air outlet of the mercury removal unit, and the other end of the second pipeline group is connected with the air inlet of the air outlet pipeline;
One end of the third pipeline group is connected with the air inlet of the mercury removal unit, and the other end of the third pipeline group is connected with the air outlet of the mercury removal unit;
one end of the fourth pipeline group is connected with the first pipeline group, and the other end of the fourth pipeline group is connected with the air outlet of the mercury removal prevention agent failure unit;
one end of the fifth pipeline group is connected with the second pipeline group, and the other end of the fifth pipeline group is connected with the air inlet of the mercury removal prevention agent failure unit;
a sixth pipeline group connected to the mercury removal prevention agent failure in-unit device;
and one ends of the seventh pipeline group and the eighth pipeline group are respectively connected with the fourth pipeline group, and the other ends of the seventh pipeline group and the eighth pipeline group are respectively connected with a nitrogen source.
2. The hot-purged dry natural gas moisture mercury removal apparatus of claim 1, wherein the mercury removal agent failure means further comprises a heat exchanger connected to the mercury removal unit, the refrigerator, and the heater.
3. The hot-purge dry natural gas moisture mercury removal apparatus of claim 1, wherein the heater has a heating temperature of 70 ℃ to 100 ℃; the refrigerating temperature of the refrigerator is 1-4 ℃.
4. The hot-purged dry natural gas moisture mercury removal apparatus of claim 1, wherein the mercury removal unit comprises a first mercury removal column and a second mercury removal column connected to each other; the first mercury removal tower and the second mercury removal tower are controlled by the gas circuit control unit to be double-tower serial mercury removal or double-tower parallel mercury removal.
5. The hot-purged dry natural gas moisture mercury removal apparatus of claim 4, wherein the mercury removal agent failure unit comprises a first mercury removal agent failure means and a second mercury removal agent failure means; the first mercury removal prevention agent invalidation device is connected with the first mercury removal tower; the second mercury removal prevention agent invalidation device is connected with the second mercury removal tower.
6. A hot-purge dry natural gas moisture mercury removal method, characterized in that the hot-purge dry natural gas moisture mercury removal method uses the hot-purge dry natural gas moisture mercury removal apparatus according to any one of claims 1 to 5; the hot-blowing drying type natural gas wet gas mercury removal method comprises a multi-tower serial mercury removal method and a multi-tower parallel mercury removal method;
when the performance of the single mercury removal tower fails unexpectedly, the multi-tower serial mercury removal method or the multi-tower parallel mercury removal method further comprises the steps of maintaining the single mercury removal tower and removing mercury from the rest mercury removal towers, and specifically comprises the following steps:
The natural gas is controlled to enter a mercury removal unit by a gas circuit control unit, a single mercury removal tower which is invalid in the mercury removal unit uses a correspondingly connected mercury removal agent invalidation device to carry out mercury removal agent maintenance, and other mercury removal towers carry out multi-tower serial mercury removal or multi-tower parallel mercury removal;
when the mercury removal tower uses the mercury removal agent invalidation device to carry out mercury removal agent maintenance, the natural gas in the mercury removal tower and the mercury removal agent invalidation device flows to the mercury removal tower, the heat exchanger, the refrigerator, the heater, the circulating pump and the mercury removal tower in sequence to form closed circulation, so that the maintenance of the mercury removal agent in the mercury removal tower is completed;
the spent mercury removal column further includes a nitrogen substitution step prior to mercury removal maintenance using a correspondingly connected mercury removal prevention agent spent device.
7. The hot-purged dry natural gas wet gas mercury removal method of claim 6, wherein when a plurality of mercury removal columns fail unexpectedly, the multi-column serial mercury removal method or multi-column parallel mercury removal method further comprises a plurality of mercury removal columns maintenance, and the remaining mercury removal columns mercury removal steps specifically comprise:
the natural gas is controlled by the gas circuit control unit to enter the mercury removal unit, a plurality of mercury removal towers which are invalid in the mercury removal unit use a plurality of mercury removal agent invalidation devices which are correspondingly connected to carry out mercury removal agent maintenance, and the rest mercury removal towers carry out multi-tower serial mercury removal or multi-tower parallel mercury removal.
8. The hot-purged dry natural gas wet gas mercury removal process of claim 6, wherein the multi-column serial mercury removal process or multi-column parallel mercury removal process further comprises the step of maintenance of all mercury removal columns, particularly comprising:
and the natural gas is controlled to enter the mercury removal unit by the gas circuit control unit, and all the multiple mercury removal towers which are invalid in the mercury removal unit use the multiple mercury removal agent invalidation devices which are correspondingly connected to carry out mercury removal agent maintenance.
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