CN215352848U - Storage tank oil gas VOCs recovery processing system - Google Patents
Storage tank oil gas VOCs recovery processing system Download PDFInfo
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- CN215352848U CN215352848U CN202121301749.1U CN202121301749U CN215352848U CN 215352848 U CN215352848 U CN 215352848U CN 202121301749 U CN202121301749 U CN 202121301749U CN 215352848 U CN215352848 U CN 215352848U
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Abstract
The utility model discloses a system for recovering and treating VOCs (volatile organic compounds) in oil gas of a storage tank, which comprises an absorption tower, an adsorption tank and a regeneration module, wherein condensate oil is used as an absorbent, honeycomb activated carbon is used as an adsorbent, and the regeneration module is used for regenerating saturated honeycomb activated carbon in the adsorption tank; the lower inlet of the absorption tower is connected with the top gas phase outlet of the crude oil storage tank through a pipeline; an upper absorption liquid inlet of the absorption tower is connected with a condensate oil supply pipeline; a liquid phase outlet at the lower part of the absorption tower is connected with a condensate rich liquid storage tank through a pipeline; an outlet at the upper part of the absorption tower is connected with an inlet of the adsorption tank through a pipeline; the outlet of the adsorption tank is connected with the diffusing pipe; a plurality of honeycomb-shaped activated carbon are placed in the adsorption box, and a plurality of airflow channels are arranged in the honeycomb-shaped activated carbon. The utility model realizes two-stage recovery of VOCs by the absorption tower which takes condensate oil as an absorbent and the absorption box which takes honeycomb activated carbon as an absorbent, thereby reducing the loss of oil products in the oil tank.
Description
Technical Field
The utility model belongs to the technical field of VOCs treatment, and particularly relates to a system for recovering and treating VOCs in oil gas of a storage tank.
Background
The oil tank is a large-sized container for storing oil products, and Volatile Organic Compounds (VOCs) are generated during oil receiving and dispatching operations and standing respiration. The emission of Volatile Organic Compounds (VOCs) creates a hazard to the atmosphere, the environment, and human health. With the increasing importance of the country on environmental protection and air pollution prevention, Volatile Organic Chemicals (VOCs) of the oil tank need to be treated.
At present, an air extractor is mostly adopted for extracting VOCs in an oil tank, and then the extracted VOCs are directly introduced into open fire equipment such as a thermal oxidation furnace, a heat storage oxidation furnace, a heating furnace and the like for incineration treatment. However, the withdrawn VOCs contain a part of vaporized heavy hydrocarbons, and direct incineration thereof results in loss of oil products in the oil tank, and thus it is necessary to recover the same.
Based on above problem, the application provides a storage tank oil gas VOCs recovery processing system that can retrieve the volatile VOCs of oil tank.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a system for recovering and treating VOCs in storage tank oil gas.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a system for recovering and treating VOCs (volatile organic compounds) in oil gas of a storage tank comprises an absorption tower using condensate oil as an absorbent, an adsorption tank using honeycomb-shaped active carbon as an adsorbent and a regeneration module for regenerating saturated honeycomb-shaped active carbon in the adsorption tank;
the lower inlet of the absorption tower is connected with the top gas phase outlet of the crude oil storage tank through a pipeline; an upper absorption liquid inlet of the absorption tower is connected with a condensate oil supply pipeline; a liquid phase outlet at the lower part of the absorption tower is connected with a condensate rich liquid storage tank through a pipeline; an outlet at the upper part of the absorption tower is connected with an inlet of the adsorption tank through a pipeline;
the outlet of the adsorption tank is connected with the diffusion pipe; a plurality of honeycomb activated carbons are placed in the adsorption box, a plurality of airflow channels are arranged in the honeycomb activated carbons, and the airflow channels are in an open state on two opposite end faces of the honeycomb activated carbons.
Preferably, an oil-gas pump is arranged on a pipeline between the inlet at the lower part of the absorption tower and the gas phase outlet at the top of the crude oil storage tank, and an oil-gas cut-off valve is arranged at the inlet of the oil-gas pump.
Preferably, an oil pump is provided in the condensate supply line.
Preferably, the pipeline between the lower liquid phase outlet of the absorption tower and the condensate rich liquid storage tank and the pipeline between the upper outlet of the absorption tower and the inlet of the adsorption tank are both provided with a cut-off valve.
Preferably, the bottom inlet of the diffusing pipe is connected with the outlet of the fan, and the inlet of the fan is connected with the outlet of the adsorption tank.
Preferably, the regeneration module comprises a regeneration tank capable of housing a number of saturated cellular activated carbons:
a gas inlet of the regeneration box is connected with a hot steam supply pipeline, a gas outlet of the regeneration box is connected with a medium inlet of a condenser, and a medium outlet of the condenser is connected with an inlet of a three-phase separator; an oil phase outlet of the three-phase separator is connected with the oil storage tank, and a water phase outlet of the three-phase separator is connected with the sewage pool; and a gas phase outlet of the three-phase separator is connected with a lower inlet of the absorption tower.
Preferably, a plurality of cavities which are parallel and used for placing the saturated honeycomb activated carbon are arranged in the regeneration box;
a gas inlet piece is arranged at a gas inlet of the regeneration box; the gas inlet piece comprises a regeneration inlet pipe connected with a hot steam supply pipeline, and a gas dispersion cavity is arranged at the end part of the regeneration inlet pipe positioned in the regeneration box; the end part of the gas dispersion cavity facing each cavity is provided with a plurality of gas flow dispersion pipe assemblies corresponding to each cavity; the airflow dispersion pipe assembly comprises a plurality of airflow branch pipes which can correspond to airflow channel openings on one end face of the honeycomb activated carbon;
and a gas outlet pipe communicated to each chamber is arranged at a gas outlet of the regeneration box, and the gas outlet pipe is connected with a medium inlet of the condenser.
Preferably, an inlet of the hot steam supply pipe is connected to an outlet of the heater, and an inlet of the heater is connected to the water pipe.
Preferably, a cooling liquid inlet of the condenser is connected with a cooling water pipe, and a cooling liquid outlet of the condenser is connected with a hot water pipe.
The utility model has the beneficial effects that:
(1) the utility model realizes two-stage recovery of VOCs by the absorption tower which takes condensate oil as an absorbent and the absorption box which takes honeycomb activated carbon as an absorbent, thereby reducing the loss of oil products in the oil tank.
(2) The condensate oil is used as the absorbent, and because the condensate oil component is similar to the crude oil component, the Volatile Organic Compounds (VOCs) gas of the crude oil can be better absorbed according to the similarity and intermiscibility principle, and the enriched condensate oil absorbent does not need regeneration treatment and can be subsequently and specially applied; because many stations and oil fields have the existing condensate oil, the condensate oil can be directly used as an absorbent to absorb the VOCs gas of the oil tank, on one hand, the absorbent is not needed to be purchased additionally, the cost is saved, on the other hand, the enriched condensate oil after absorbing the VOCs gas does not need to be regenerated as other absorbents, and the subsequent regeneration treatment cost is saved.
(3) In the regeneration module, the saturated honeycomb activated carbon is regenerated by adopting a hot steam purging regeneration method, VOCs absorbed by the activated carbon are condensed, separated and recovered in the regeneration process, so that the recovery yield of the VOCs is improved on one hand, and compared with the existing crushing and remolding method, the hot steam purging method has the advantages of simple operation and cost saving on the other hand.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic flow diagram of a system for recovering and treating VOCs from storage tank oil gas according to the present invention;
FIG. 2 is a schematic view showing the structure of honeycomb activated carbon in the present invention;
FIG. 3 is a schematic flow diagram of a regeneration module of the present invention;
FIG. 4 is a first schematic structural diagram of a regeneration box according to the present invention;
FIG. 5 is a schematic view of the structure of the regeneration box of the present invention;
wherein:
0-crude oil storage tank
1-absorption tower, 101-oil-gas pump, 102-oil-gas cut-off valve, 103-cut-off valve, 2-honeycomb activated carbon, 201-gas flow channel, 3-adsorption tank, 4-condensate supply pipeline, 401-oil pump, 5-condensate rich liquid storage tank, 6-diffusing pipe, 7-blower, 8-regeneration tank, 801-regeneration inlet pipe, 802-gas dispersing cavity, 803-gas flow branch pipe, 804-gas outlet pipe, 9-hot steam supply pipeline, 10-condenser, 11-three-phase separator, 12-oil storage tank, 13-sewage tank, 14-heater, 15-water pipe, 16-cooling water pipe and 17-hot water pipe.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "bottom", "top", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and do not particularly indicate any components or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The utility model is further illustrated with reference to the following figures and examples.
Example 1:
as shown in fig. 1, a system for recovering and treating the VOCs in the oil gas of the storage tank comprises an absorption tower 1 using condensate oil as an absorbent, an adsorption tank 3 using honeycomb activated carbon 2 as an adsorbent, and a regeneration module for regenerating the saturated honeycomb activated carbon 2 in the adsorption tank 3;
the lower inlet of the absorption tower 1 is connected with the top gas phase outlet of the crude oil storage tank 0 through a pipeline; an upper absorption liquid inlet of the absorption tower 1 is connected with a condensate oil supply pipeline 4; a liquid phase outlet at the lower part of the absorption tower 1 is connected with a condensate oil rich liquid storage tank 5 through a pipeline; an outlet at the upper part of the absorption tower 1 is connected with an inlet of the adsorption tank 3 through a pipeline; the absorption tower 1 is a device for realizing absorption operation, can be realized by adopting the prior art, and the specific internal structure is not described again;
the outlet of the adsorption tank 3 is connected with a diffusing pipe 6; a plurality of honeycomb activated carbon 2 are placed in the adsorption tank 3, as shown in fig. 2, a plurality of airflow channels 201 are arranged in the honeycomb activated carbon 2, and the airflow channels 201 are in an open state on two opposite end faces of the honeycomb activated carbon 2. The airflow channel in the honeycomb activated carbon 2 is in a vertically crossed grid structure, wherein the airflow channel 201 is open on two opposite end faces of the honeycomb activated carbon 2, and the other four end faces are blocked.
Preferably, an oil-gas pump 101 is arranged on a pipeline between the lower inlet of the absorption tower 1 and the top gas phase outlet of the crude oil storage tank 0, and an oil-gas cut-off valve 102 is arranged at the inlet of the oil-gas pump 101.
Preferably, an oil pump 401 is provided in the condensate supply line 4.
Preferably, a shut-off valve 103 is provided on a pipeline between the lower liquid phase outlet of the absorption tower 1 and the condensate rich liquid storage tank 5, and a pipeline between the upper outlet of the absorption tower 1 and the inlet of the adsorption tank 3.
Preferably, the bottom inlet of the diffusing pipe 6 is connected with the outlet of a fan 7, and the inlet of the fan 7 is connected with the outlet of the adsorption tank 3.
The volatile VOCs gas from the crude oil storage tank 0 is first pumped into the absorption tower 1 by the oil gas pump 101. The absorption tower 1 utilizes condensate oil as an absorbent to realize a primary absorption recovery link in the absorption tower 1; wherein in the absorption tower 1, condensate oil is pressurized by an oil pump 401 and then is conveyed to an absorption liquid inlet at the upper part of the absorption tower 1 and is sprayed from top to bottom; VOCs gas enters from the inlet at the lower part of the absorption tower 1 and reversely contacts condensate oil sprayed from the top of the absorption tower to carry out the absorption process. The enriched condensate enters a condensate rich liquid storage tank 5 and can be utilized subsequently. Most of the VOCs gas in the absorption tower 1 is absorbed, and the tail gas containing a small amount of VOCs gas discharged from the upper outlet of the absorption tower 1 enters the next link. VOCs gas purified by primary absorption enters an adsorption box 3, and secondary adsorption purification is realized through the adsorption effect of the honeycomb activated carbon 2; the waste gas after reaching the standard can be directly discharged into the atmosphere through the diffusing pipe 6. The honeycomb activated carbon 2 in the adsorption tank 3 can be regenerated, and when the honeycomb activated carbon 2 is saturated, the honeycomb activated carbon can be directly taken out from the adsorption tank 3, and the regeneration and cyclic utilization are realized through the regeneration module.
The condensate oil used as the absorbent in the present application refers to a liquid phase component condensed from a condensate gas field or oil field associated natural gas, and is also called natural gasoline. The main component of the catalyst is a mixture of C5-C11 + hydrocarbons, and the catalyst contains a small amount of hydrocarbons larger than C8 and impurities such as sulfur dioxide, thiophenes, thiols, thioethers and polysulfides, and the fraction of the catalyst is mostly between 20 ℃ and 200 ℃. Condensate oil components are similar to crude oil components, Volatile Organic Compounds (VOCs) gas of the crude oil can be well absorbed according to the similarity and intermiscibility principle, and the enriched condensate oil absorbent does not need regeneration treatment and can be specially applied subsequently. Because many stations and oil fields have the existing condensate oil, the condensate oil can be directly used as an absorbent to absorb the VOCs gas of the oil tank, on one hand, the absorbent is not needed to be purchased additionally, the cost is saved, on the other hand, the enriched condensate oil after absorbing the VOCs gas does not need to be regenerated as other absorbents, and the subsequent regeneration treatment cost is saved.
The activated carbon is the most commonly used oil gas adsorption material at present, and has the advantages of large specific surface area, hydrophobic surface, developed pores, high oil gas adsorption rate, low one-time investment cost and the like. The honeycomb activated carbon adopted in the application has the greatest characteristics of good purification effect and small wind speed resistance besides the advantages of the traditional activated carbon. Due to the unique honeycomb airflow channel structure with vertically crossed grids, the honeycomb airflow channel structure has the advantages of high aperture ratio, uniform gas distribution, larger geometric surface area, short diffusion path, wear resistance and the like. Under the same condition, the resistance is only about 1/10 of the same-proportion granular activated carbon, and the problem of overlarge wind resistance caused by the fact that the columnar activated carbon is piled up too much in the waste gas treatment tower in the prior art is solved.
Example 2:
on the basis of example 1, the regeneration module comprises a regeneration tank 8 capable of housing a number of saturated cellular activated carbons:
as shown in fig. 3, a gas inlet of the regeneration tank 8 is connected with a hot steam supply pipeline 9, a gas outlet of the regeneration tank 8 is connected with a medium inlet of a condenser 10, and a medium outlet of the condenser 10 is connected with an inlet of a three-phase separator 11; an oil phase outlet of the three-phase separator 11 is connected with an oil storage tank 12, and a water phase outlet of the three-phase separator 11 is connected with a sewage pool 13; the gas phase outlet of the three-phase separator 11 is connected with the lower inlet of the absorption tower 1.
Preferably, a plurality of parallel chambers for placing the saturated honeycomb activated carbon 2 are arranged in the regeneration box 8;
a gas inlet piece is arranged at a gas inlet of the regeneration box 8; the gas inlet piece comprises a regeneration inlet pipe 801 connected with a hot steam supply pipeline 9, and the end part of the regeneration inlet pipe 801 positioned in the regeneration box 8 is provided with a gas dispersion cavity 802; the end part of the gas dispersion cavity 802 facing each chamber is provided with a plurality of gas flow dispersion pipe assemblies corresponding to each chamber; the airflow dispersion pipe assembly comprises a plurality of airflow branch pipes 803 which can correspond to airflow channel openings on one end surface of the honeycomb activated carbon;
and a gas outlet pipe 804 communicated with each chamber is arranged at a gas outlet of the regeneration box 8, and the gas outlet pipe 804 is connected with a medium inlet of the condenser 10.
Wherein the chambers in the regeneration box 8 can be distributed in parallel up and down as shown in fig. 4, the length of the chambers extends along the horizontal direction, the gas inlet is positioned at the left side of the regeneration box 8, and the gas outlet is positioned at the right side of the regeneration box 8; the chambers within regeneration box 8 may also be arranged side-to-side in parallel as shown in fig. 5, where the length of the chambers extends in a vertical direction, the gas inlet is located at the bottom of the left side of regeneration box 8, and the gas outlet is located at the top of the right side of regeneration box 8.
During regeneration, a plurality of saturated honeycomb-shaped activated carbons are placed in each chamber in the regeneration box 8 in an end-to-end connection manner, wherein the end-to-end connection means that the openings of the airflow channels on the end surfaces of two adjacent honeycomb-shaped activated carbons are in one-to-one correspondence, so that the airflow channels are communicated, and meanwhile, the openings of the airflow channels of the honeycomb-shaped activated carbons close to the gas inlet piece are in one-to-one correspondence with the corresponding gas dispersion pipes 803; when the regeneration box 8 adopts the structure of fig. 4, the saturated honeycomb activated carbon in each chamber is arranged in a left-right alignment manner, and when the regeneration box 8 adopts the structure of fig. 5, the saturated honeycomb activated carbon in each chamber is arranged in a vertical alignment manner.
After the saturated honeycomb activated carbon is placed, hot steam is introduced into the regeneration inlet pipe 801 through the hot steam supply pipe 9, and then the hot steam is respectively aligned and introduced into the airflow channels of the honeycomb activated carbon through the gas dispersion cavity 802 and the airflow branch pipe 803; because the open end of the airflow channel of the honeycomb-shaped activated carbon close to the gas inlet piece in each chamber is provided with the corresponding gas dispersion pipe 803, the open end of each airflow channel is ensured to be provided with the hot steam for introducing and blowing, and the regeneration efficiency is improved.
Preferably, the inlet of the hot steam supply pipe 9 is connected to the outlet of the heater 14, and the inlet of the heater 14 is connected to the water pipe 15.
Preferably, the cooling liquid inlet of the condenser 10 is connected with a cooling water pipe 16, and the cooling liquid outlet of the condenser 10 is connected with a hot water pipe 17.
At present, the honeycomb activated carbon needs to be crushed into powder for regeneration treatment, and the honeycomb activated carbon is processed into a honeycomb shape through technology after the regeneration treatment. The operation flow is complicated, and meanwhile, certain cost is increased.
The hot steam purging regeneration method is adopted, water is heated by the heater 14 and then becomes hot steam, then the hot steam enters the regeneration box 8, the honeycomb-shaped active carbon is purged to carry out the regeneration process, the hot steam purges gas adsorbed by the honeycomb-shaped active carbon and carries the gas to enter the condenser 10 for cooling, most of mixed gas becomes liquid, and then the gas phase, oil and water are separated by the three-phase separator 11. The oil is discharged into the oil storage tank 12 for recycling, the wastewater is discharged into the sewage tank 13 for subsequent treatment, and the separated gas phase enters the absorption tower 1 again for absorption treatment.
In particular, the pipelines involved in the regeneration module are each provided with a corresponding valve.
The recovery processing method of the storage tank oil gas VOCs recovery processing system in the embodiment 1 or the embodiment 2 comprises the following steps:
s1: starting the oil-gas pump 101 and the oil pump 401, so that VOCs gas volatilized from the storage tank and condensate oil serving as an absorbent enter the absorption tower 1 from the lower inlet and the upper inlet respectively, and performing primary absorption and purification through the condensate oil to realize primary purification and recovery of the VOCs gas;
s2: VOCs gas purified by the primary absorption of condensate oil in the absorption tower 1 enters an adsorption tank 3, and secondary adsorption purification is carried out through honeycomb activated carbon 2; in the process of carrying out hot steam purging regeneration on saturated honeycomb activated carbon by using a regeneration module, carrying out condensation separation and recovery on VOCs gas adsorbed by the honeycomb activated carbon, thereby realizing secondary recovery of the VOCs gas;
s3: the tail gas after the two-stage adsorption and purification reaches the emission standard and is discharged through a diffusing pipe.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.
Claims (9)
1. A system for recovering and treating VOCs (volatile organic compounds) in oil gas of a storage tank is characterized by comprising an absorption tower using condensate oil as an absorbent, an adsorption tank using honeycomb activated carbon as an adsorbent and a regeneration module for regenerating saturated honeycomb activated carbon in the adsorption tank;
the lower inlet of the absorption tower is connected with the top gas phase outlet of the crude oil storage tank through a pipeline; an upper absorption liquid inlet of the absorption tower is connected with a condensate oil supply pipeline; a liquid phase outlet at the lower part of the absorption tower is connected with a condensate rich liquid storage tank through a pipeline; an outlet at the upper part of the absorption tower is connected with an inlet of the adsorption tank through a pipeline;
the outlet of the adsorption tank is connected with the diffusion pipe; a plurality of honeycomb activated carbons are placed in the adsorption box, a plurality of airflow channels are arranged in the honeycomb activated carbons, and the airflow channels are in an open state on two opposite end faces of the honeycomb activated carbons.
2. The system for recycling and treating storage tank oil gas VOCs according to claim 1, wherein an oil gas pump is arranged on a pipeline between a lower inlet of the absorption tower and a gas phase outlet at the top of the crude oil storage tank, and an oil gas cut-off valve is arranged at an inlet of the oil gas pump.
3. The system for recovery and disposal of storage tank oil and gas VOCs according to claim 1, wherein an oil pump is provided on said condensate supply line.
4. The system for recovering and treating storage tank oil and gas VOCs according to claim 1, wherein a shut-off valve is arranged on a pipeline between a lower liquid phase outlet of the absorption tower and the condensate rich liquid storage tank and a pipeline between an upper outlet of the absorption tower and an inlet of the adsorption tank.
5. The system for recovery and disposal of storage tank hydrocarbons, VOCs, of claim 1, wherein a bottom inlet of said blow-off pipe is connected to an outlet of a blower, and an inlet of said blower is connected to an outlet of said adsorption tank.
6. The storage tank oil and gas VOCs recovery processing system of claim 1, wherein the regeneration module comprises a regeneration tank capable of holding a number of saturated cellular activated carbons:
a gas inlet of the regeneration box is connected with a hot steam supply pipeline, a gas outlet of the regeneration box is connected with a medium inlet of a condenser, and a medium outlet of the condenser is connected with an inlet of a three-phase separator; an oil phase outlet of the three-phase separator is connected with the oil storage tank, and a water phase outlet of the three-phase separator is connected with the sewage pool; and a gas phase outlet of the three-phase separator is connected with a lower inlet of the absorption tower.
7. The storage tank oil and gas VOCs recovery processing system of claim 6, wherein a plurality of parallel chambers for housing saturated cellular activated carbon are arranged in the regeneration tank;
a gas inlet piece is arranged at a gas inlet of the regeneration box; the gas inlet piece comprises a regeneration inlet pipe connected with a hot steam supply pipeline, and a gas dispersion cavity is arranged at the end part of the regeneration inlet pipe positioned in the regeneration box; the end part of the gas dispersion cavity facing each cavity is provided with a plurality of gas flow dispersion pipe assemblies corresponding to each cavity; the airflow dispersion pipe assembly comprises a plurality of airflow branch pipes which can correspond to airflow channel openings on one end face of the honeycomb activated carbon;
and a gas outlet pipe communicated to each chamber is arranged at a gas outlet of the regeneration box, and the gas outlet pipe is connected with a medium inlet of the condenser.
8. The system of claim 6, wherein the inlet of said hot steam supply line is connected to the outlet of a heater, and the inlet of said heater is connected to a water line.
9. The system of claim 6, wherein the condenser has a coolant inlet connected to a coolant line and a coolant outlet connected to a hot water line.
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