CN112063390A - Dry quenching circulating water pipeline backflow system and automatic pressurization method - Google Patents
Dry quenching circulating water pipeline backflow system and automatic pressurization method Download PDFInfo
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- CN112063390A CN112063390A CN202010931641.4A CN202010931641A CN112063390A CN 112063390 A CN112063390 A CN 112063390A CN 202010931641 A CN202010931641 A CN 202010931641A CN 112063390 A CN112063390 A CN 112063390A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B43/00—Preventing or removing incrustations
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
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Abstract
The application relates to a dry quenching circulating water pipeline backflow system and an automatic pressurization method, and belongs to the technical field of circulating water pipeline backflow. The application provides a return system of a dry quenching circulating water pipeline, wherein a first pressure gauge is arranged on a return pipe; the water return pipe is provided with a water return branch; the water inlet and the water outlet of the water return branch are respectively positioned at two sides of the first pressure gauge, and the water return branch is provided with a branch electric valve and a pipeline pump; when the first pressure gauge detects that the pressure of the water return pipe is smaller than a preset value, the branch electric valve and the pipeline pump are opened, so that circulating water is backwashed in parallel from the backwater branch. The application also provides an automatic pressurization method for the return of the coke dry quenching circulating water pipeline, and the coke dry quenching circulating water pipeline return system is applied. The return system of the dry quenching circulating water pipeline and the automatic pressurization method not only ensure the normal return of the circulating water, but also avoid the overflow of the circulating water from a return pipe funnel.
Description
Technical Field
The application relates to the technical field of circulating water pipeline backflow, in particular to a dry quenching circulating water pipeline backflow system and an automatic pressurization method.
Background
Two or four water-cooling sleeves 5 are generally used for discharging ash in a primary dust remover of a dry quenching system, and because the top of each water-cooling sleeve is high-temperature red ash and the temperature reaches 500-600 ℃, the water-cooling sleeve needs to cool the high-temperature red ash by circulating water at 20-30 ℃, and then can discharge the cooled low-temperature ash powder.
However, the existing water return system can meet the requirement of water return circulation, if the flow rate of circulating water is reduced or a water return pipeline is blocked, the circulating water cannot flow back from a water return pipe in time, so that the circulating water overflows from a funnel and flows to a next platform, and the electrical equipment of the next platform is damaged.
Disclosure of Invention
Therefore, the application provides a return system of a coke dry quenching circulating water pipeline and an automatic pressurization method, which can ensure normal return of circulating water and ensure normal return of the coke dry quenching circulating water pipeline.
Some embodiments of the present application provide a return system of a dry quenching circulating water pipeline, including a water inlet pipe, a first heat source cooling pipeline and a water return pipe which are sequentially communicated, the water return pipe being provided with a water return pipe funnel; a first pressure gauge is arranged on the water return pipe; the water return pipe is provided with a water return branch; the water inlet and the water outlet of the water return branch are respectively positioned at two sides of the first pressure gauge, and the water return branch is provided with a branch electric valve and a pipeline pump; and when the first pressure gauge detects that the pressure of the water return pipe is smaller than a preset value, the branch electric valve and the pipeline pump are opened, so that circulating water is backwashed in parallel from the backwater branch.
The dry quenching circulating water pipeline return system in this application embodiment is equipped with first manometer at the wet return, and has arranged the return water branch road, and the return water branch road is equipped with the tubing pump, can pressurize the return water branch road, promotes the flow of circulating water, not only ensures the normal return water of circulating water, still avoids the circulating water to spill over from the wet return funnel.
In addition, the return system of the dry quenching circulating water pipeline according to the embodiment of the application has the following additional technical characteristics:
according to some embodiments of the application, the return water branch is provided with two, and the two return water branches are connected in parallel and share the same branch electric valve. Through arranging the two water return branches, when one water return branch fails, the other water return branch can be used for promoting the return of circulating water in time, and overflow at the funnel of the water return pipe is avoided.
According to some embodiments of the application, the return water branch is further provided with a check valve, and the pipe pump and the check valve are sequentially arranged in a circulating water flow direction. By arranging the check valve, the circulating water can be prevented from reversely flowing in the water return branch; through setting up the tubing pump, can pressurize the water of return water branch road, ensure that the return water is normal. The check valve is provided after the pipe pump, and also can protect the pipe pump from being damaged.
According to some embodiments of the present application, the dry quenching circulating water pipe return system is further provided with: and one end of the outflow pipeline is connected with the water outlet side of the branch electric valve, and the other end of the outflow pipeline is communicated with the second heat source cooling pipeline. The outflow pipeline is used as a water inlet pipeline of circulating cooling water of a second heat source nearby, circulating water can be made to flow in time, overflow of a funnel of the water return pipe is avoided, and secondary utilization of the circulating water led to the outside is achieved.
According to some embodiments of the application, be equipped with the stop valve of effluenting and the motorised valve of effluenting on the pipeline of effluenting in proper order, can increase the switch reliability of the pipeline of effluenting, avoid the circulating water to get into second heat source cooling pipeline through the pipeline of effluenting under the unblocked circumstances of return water branch road.
According to some embodiments of the application, the second heat source cooling line comprises a boiler forced circulation water pump, and the water outlet side of the outflow conduit is connected to the boiler forced circulation water pump. With this form, the outflow conduit is communicated with the second heat source cooling line.
According to some embodiments of the application, the return water branch is provided with a branch pressure gauge to detect a water pressure of the return water branch.
Some embodiments of the present application further provide an automatic pressurization method for a return of a coke dry quenching circulating water pipeline, which applies the above-mentioned coke dry quenching circulating water pipeline return system, and includes: defining a predetermined pressure P of the return pipe2(ii) a When the pressure P of the water return pipe is more than or equal to P2When the water is circulated, the circulating water returns from the water return pipe; when the pressure P of the water return pipe is less than P2When the water return branch is opened, the circulating water is backwashed from the backwater branch in parallel, so that the water pressure Pa in the backwater branch is more than or equal to P2。
In the automatic pressurization method for the return flow of the coke dry quenching circulating water pipeline in the embodiment of the application, three water pipes are additionally arranged on the water return pipe, wherein two water pipes are used for parallel return flow, the other water pipe is used as a cooling water inlet pipeline of another equipment, normal return flow of the circulating water can be ensured, or the circulating water is led out to another cooling system for secondary utilization when the water return pipe and the return water branch cannot effectively return, water overflow at the funnel of the water return pipe can be avoided, the safety of electrical equipment is ensured, the reliability is good, and heat energy is fully utilized.
In addition, the automatic pressurization method for the return flow of the coke dry quenching circulating water pipeline according to the embodiment of the application has the following additional technical characteristics:
according to some embodiments of the present application, there are two return water branches, and the two return water branches are connected in parallel; when P < P2When one backwater branch fails, the circulating water is backwashed in parallel from the other backwater branch. Through setting up two return water branch roads, can use another return water branch road when a return water branch road trouble, ensure that the circulating water can in time return water.
According to some embodiments of the application, when two return water branches all break down, the circulating water gets into second heat source cooling pipeline from the pipeline of effluenting, not only avoids return water pipe funnel department overflow, still realizes the reutilization to the circulating water that leads to the outside.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic diagram of a first form of a dry quenching circulating water conduit return system provided by an embodiment of the application;
FIG. 2 is a schematic diagram of a second form of a dry quenching circulating water conduit return system provided by an embodiment of the application;
fig. 3 is a schematic diagram of a return system of a dry quenching circulating water pipeline in the prior art.
Icon: 100-dry quenching circulating water pipeline reflux system; 110-a water inlet pipe; 111-water inlet pipe stop valve; 120-a first heat source cooling circuit; 130-a water return pipe; 131-a vertical section; 132-a transverse segment; 133-a water return pipe stop valve; 140-a water return pipe funnel; 151-a first pressure gauge; 152-a first electrically operated valve; 160-water return branch; 165-branch electric valve; 166-a pipeline pump; 167-check valve; 168-branch pressure gauge; 161-a first water return branch; 1611-a first tubing pump; 1612-second pressure gauge; 1613-a first check valve; 162-a second return water branch; 1621-a second pipeline pump; 1622-a third pressure gauge; 1623-a second check valve; 163-branch inlet pipe; 164-branch water outlet pipe; 170-an outflow conduit; 171-an outflow stop valve; 172-outflow electric valve; 173-the outlet side of the outflow conduit; 180-a second heat source cooling circuit; 181-boiler forced circulation water pump; 200-a dry quenching circulating water pipeline reflux system; 210-a water inlet pipe; 220-heat source cooling circuit; 230-a water return pipe; 231-a vertical section; 232-transverse section; 240-return pipe funnel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 3, in the prior art, a coke dry quenching circulating water pipe return system 200 includes a water inlet pipe 210, a heat source cooling pipeline 220 and a water return pipe 230 which are sequentially communicated, the water return pipe 230 includes a vertical section 231 and a horizontal section 232 which are sequentially connected along a circulating water flow direction, a water return pipe funnel 240 is disposed on the vertical section 231, and circulating water sequentially flows through the heat source cooling pipeline 220 from the water inlet pipe 210 and then returns from the water return pipe 230.
The water return pipe funnel 240 is an open type funnel, and a pressure head corresponding to a height difference Δ H between the water return pipe funnel 240 and the ground is a water pressure of the circulating water entering the water return pipe funnel 240.
When sundries are blocked in the transverse section 232 of the water return pipe 230 or the flow entering the return system 200 of the dry quenching circulating water pipeline from the water inlet pipe 210 is too small, the pressure in the transverse section pipe is too small, and the circulating water overflows from the water return pipe funnel 240, so that the circulating water is wasted and external electrical equipment is damaged.
In view of the above-mentioned defects of the coke dry quenching circulating water pipe return system 200 discovered during the use process, the embodiment of the present application proposes a coke dry quenching circulating water pipe return system 100, which is based on the existing coke dry quenching circulating water pipe return system 200, and improves the transverse section 232 of the return pipe 230, so as to avoid the occurrence of sundries blockage in the transverse section 232 or overflow of the circulating water from the return pipe funnel 240 when the flow entering the coke dry quenching circulating water pipe return system 200 from the water inlet pipe 210 is too small, which results in the waste of the circulating water and damages to the external electrical equipment.
The following explains a technical scheme of a dry quenching circulating water pipeline return system 100 in the embodiment of the application.
Referring to fig. 1, a dry quenching circulating water pipe return system 100 according to an embodiment of the present invention includes a water inlet pipe 110, a first heat source cooling pipeline 120, and a water return pipe 130, which are sequentially connected, and the water return pipe 130 is provided with a water return pipe funnel 140. The water return pipe 130 includes a vertical section 131 and a horizontal section 132 connected in sequence along the circulating water flowing direction, a water return pipe funnel 140 is disposed on the vertical section 131, and the circulating water flows through the first heat source cooling pipeline 120 in sequence from the water inlet pipe 110 and then flows back from the water return pipe 130.
The transverse section 132 of the water return pipe 130 is provided with a first pressure gauge 151, the transverse section 132 is provided with a water return branch 160, a water inlet and a water outlet of the water return branch 160 are respectively located at two sides of the first pressure gauge 151, and the water return branch 160 is provided with a branch electric valve 165 and a pipe pump 166. When the first pressure gauge 151 detects that the pressure of the water return pipe 130 is smaller than a preset value, the branch electric valve 165 and the pipeline pump 166 are opened, so that the circulating water is backwardly connected in parallel from the backwater branch 160.
In the present description, "the pressure of the return pipe 130" refers to the water pressure in the pipe of the transverse section 132.
Compared with the dry quenching circulating water pipeline return system 200, the dry quenching circulating water pipeline return system 100 in the embodiment of the application is provided with the first pressure gauge 151 and the first electric valve 152 at the transverse section 132, the water return branch 160 is arranged, the pipeline pump 166 is arranged on the water return branch 160, the water return branch 160 can be pressurized, the flowing of circulating water is promoted, normal water return of the circulating water is ensured, and the circulating water is prevented from overflowing from the water return pipe funnel 240.
In some embodiments of the present application, the first heat source cooling circuit 120 is a double-layer cooling jacket, the first heat source is high-temperature red ash, and the double-layer cooling jacket is used for cooling the high-temperature red ash.
In other embodiments, the first heat source cooling circuit 120 may also be other cooling circuits, and the first heat source may also be other media that need to be cooled.
Optionally, the water return branch 160 is further provided with a check valve 167, and the pipe pump 166 and the check valve 167 are arranged in sequence in the circulating water flow direction.
By providing the check valve 167, the reverse flow of the circulating water in the return water branch 160 can be prevented; by providing the pipe pump 166, the water in the return water branch 160 can be pressurized, ensuring that the return water is normal. The check valve 167 is provided behind the pipe pump 166, and also protects the pipe pump 166 from damage.
Optionally, the water return branch 160 is further provided with a branch pressure gauge 168, the branch pressure gauge 168 being arranged between the pipe pump 166 and the check valve 167 for detecting the pressure of the water return branch 160.
When the first pressure gauge 151 detects that the pressure in the return pipe 130 is lower than the preset value, the bypass electric valve 165 and the pipe pump 166 are turned on to promote the return of the circulating water, so as to prevent the water from overflowing from the return pipe funnel 140.
Referring to fig. 2, in some embodiments of the present disclosure, two water return branches 160 are provided, namely, a first water return branch 161 and a second water return branch 162, and the first water return branch 161 and the second water return branch 162 are connected in parallel and share the same electric valve 165.
Specifically, the dry quenching circulating water pipe return system 100 further includes a branch inlet pipe 163 and a branch outlet pipe 164. The water inlet of the first water return branch 161 and the water inlet of the second water return branch 162 are connected with the transverse section 132 through a branch water inlet pipe 163, the water outlet of the first water return branch 161 and the water outlet of the second water return branch 162 are connected with the transverse section 132 through a branch water outlet pipe 164, and a branch electric valve 165 is arranged on the branch water inlet pipe 163.
The water inlet of the first water return branch 161 and the second water return branch 162 have the same configuration. The first water returning branch line 161 includes a first pipe pump 1611, a second pressure gauge 1612 and a first check valve 1613 sequentially arranged in the circulating water flowing direction, and the second water returning branch line 162 includes a second pipe pump 1621, a third pressure gauge 1622 and a second check valve 1623 sequentially arranged in the circulating water flowing direction.
In other embodiments, the number of the return water branches can also exceed two, so as to fully ensure that the circulating water flows back in time.
Further, the return system 100 of the dry quenching circulating water pipeline is further provided with an outflow pipeline 170. One end of the outflow pipe 170 is connected to the outflow side of the bypass electric valve 165, and the other end is connected to the second heat source cooling pipe 180.
When the pressure of the water return pipe 130 is lower than the preset value and one or two branches of the water return branch 160 are failed, the outflow pipe 170 is used as a cooling water inlet pipe of the second heat source cooling pipe 180, and circulating water can be introduced into the second heat source cooling pipe 180, so that overflow at the position of the water return pipe funnel 140 is avoided.
In some embodiments of the present application, an outflow stop valve 171 and an outflow electric valve 172 are sequentially disposed on the outflow pipe 170.
By arranging the outflow stop valve 171 and the outflow electric valve 172, the opening and closing reliability of the outflow pipeline 170 can be improved, and circulating water is prevented from entering the second heat source cooling pipeline 180 through the outflow pipeline 170 under the condition that the water return branch 160 is unblocked.
The second heat source cooling pipeline 180 is one of the cooling pipelines of the second heat source, and when the pressure of the water return pipe 130 is lower than the preset value and one or two branches of the water return branch 160 are all failed, the circulating water can be introduced into the second heat source cooling pipeline 180 to assist in cooling the second heat source.
In some embodiments of the present application, the second heat source cooling circuit 180 includes a boiler forced circulation water pump 181, and the outlet pipe water outlet side 173 is connected to the boiler forced circulation water pump 181.
In this form, the outlet flow conduit 170 is connected to a second heat source cooling circuit 180.
In other embodiments, the second heat source cooling pipeline 180 may be a water circuit system capable of utilizing heat of circulating water in other forms.
The dry quenching circulating water conduit return system 100 further comprises a control device to control the automated operation of the dry quenching circulating water conduit return system 100.
The embodiment of the application also provides an automatic pressurization method for the return of the coke dry quenching circulating water pipeline, and the coke dry quenching circulating water pipeline return system 100 is applied.
The following describes the specific steps of the coke dry quenching circulating water pipeline backflow automatic pressurization method in detail by combining with the coke dry quenching circulating water pipeline backflow system 100:
calculating the height difference delta H between the water return pipe funnel 140 and the ground1And converted into a pressure difference P1;
Calculating the pressure loss of the return pipe 130 as P2=aP1A is 1-1.5, thereby defining the preset pressure of the water return pipe as P2;
When the pressure P of the return pipe 130 is more than or equal to P2Meanwhile, the circulating water returns from the water return pipe 130;
when the pressure P of the return pipe 130 is less than P2When the water return branch 160 is opened, the branch electric valve 165 is opened, the pipeline pump 166 is opened, the circulating water is backwardly connected in parallel from the water return branch 160, and the water pressure Pa in the water return branch 160 is larger than or equal to P2。
By using the automatic pressurization method for the return flow of the dry quenching circulating water pipeline in the embodiment of the application, whether the return water pipe funnel 140 is in accordance with overflow or not can be accurately judgedWhen the condition is met, the water return branch 160 is opened in time, the pipeline pump 166 can pressurize water, and when Pa is more than or equal to P2In time, the circulating water can be made to flow back in time, so that the circulating water at the return water pipe funnel 140 is prevented from overflowing.
Wherein, the instant water pressure in the pipe detected by the first pressure gauge 151 is the pressure P of the water return pipe 130; the instantaneous water pressure in the pipe detected by the branch pressure gauge 168 is the water pressure Pa in the return water branch 160.
Further, the number of the water return branches 160 is two, and the two branches are a first water return branch 161 and a second water return branch 162 which are connected in parallel.
When the pressure P of the return pipe 130 is less than P2When the water pressure Pb in the first water return branch 161 is not less than P, the branch electric valve 165 is opened, the first pipeline pump 1611 is opened, and the first water return branch 161 is connected in parallel for backflow2;
When the first pipeline pump 1611 fails and cannot be started, the second pipeline pump 1621 is started, and the second water return branch 162 is used for parallel backflow, so that the water pressure Pc of the second water return branch 162 is more than or equal to P2。
The instant water pressure in the pipe detected by the second pressure gauge 1612 is the water pressure Pb in the first water return branch 161; the instantaneous water pressure in the pipe detected by the third pressure gauge 1622 is the water pressure Pc in the second water return branch 162.
Through setting up two return water branch roads, can use another return water branch road when a return water branch road trouble, ensure that the circulating water can in time return water.
Further, when both the first water return branch 161 and the second water return branch 162 are failed, the outflow electric valve 172 is opened, and the circulating water enters the second heat source cooling pipeline 180 from the outflow pipeline 170.
The outflow pipe 170 serves as a water inlet pipe for circulating cooling water of a second heat source nearby, so that circulating water can flow in time, overflow at the position of the water return pipe funnel 140 is avoided, and secondary utilization of circulating water led to the outside is achieved.
Wherein, the inlet pipe stop valve 111, the return pipe stop valve 133 and the outflow stop valve 171 maintain a passage during the operation of the dry quenching circulating water pipe return system 100.
In the automatic pressurization method for the return flow of the coke dry quenching circulating water pipeline in the embodiment of the application, three water pipes are additionally arranged on the transverse section 132, wherein two water pipes are used for parallel return flow, the other water pipe is used as a cooling water inlet pipeline of another equipment, normal return of circulating water can be ensured, or the circulating water is led out to another cooling system for secondary utilization when the return water pipe and the return water branch cannot effectively return, water overflow at the position of the return water pipe funnel 140 can be avoided, the safety of electrical equipment is ensured, the reliability is good, and heat energy is fully utilized.
It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a dry coke quenching circulating water pipeline return-flow system, is equipped with wet return funnel, its characterized in that including inlet tube, first heat source cooling tube way and the wet return that communicates in proper order, wet return:
a first pressure gauge is arranged on the water return pipe;
the water return pipe is provided with a water return branch; the water inlet and the water outlet of the water return branch are respectively positioned at two sides of the first pressure gauge, and the water return branch is provided with a branch electric valve and a pipeline pump;
and when the first pressure gauge detects that the pressure of the water return pipe is smaller than a preset value, the branch electric valve and the pipeline pump are opened, so that circulating water is backwashed in parallel from the backwater branch.
2. The dry quenching circulating water pipeline return system of claim 1, wherein there are two return water branches, and the two return water branches are connected in parallel and share the same branch electric valve.
3. The dry quenching circulating water pipeline return system of claim 1, wherein the water return branch is further provided with a check valve, and the pipeline pump and the check valve are arranged in sequence in a circulating water flow direction.
4. The dry quenching circulating water conduit return system of claim 1, further comprising:
and one end of the outflow pipeline is connected with the water outlet side of the branch electric valve, and the other end of the outflow pipeline is communicated with the second heat source cooling pipeline.
5. The return system of coke dry quenching circulating water pipeline as claimed in claim 4, wherein the outflow pipeline is provided with an outflow stop valve and an outflow electric valve in sequence.
6. The dry quenching circulating water duct return system of claim 4, wherein the second heat source cooling circuit comprises a boiler forced circulation water pump, and the water outlet side of the outflow duct is connected to the boiler forced circulation water pump.
7. The dry quenching circulating water pipeline return system of claim 1, wherein the return water branch is provided with a branch pressure gauge.
8. An automatic pressurization method for return of a coke dry quenching circulating water pipeline, which applies the return system of the coke dry quenching circulating water pipeline of any one of claims 1 to 7, and is characterized by comprising the following steps:
defining a predetermined pressure P of the return pipe2;
When the pressure P of the water return pipe is more than or equal to P2When the water is circulated, the circulating water returns from the water return pipe;
when the pressure P of the water return pipe is less than P2When the water return branch is opened, the circulating water is backwashed from the backwater branch in parallel, so that the water pressure Pa in the backwater branch is more than or equal to P2。
9. The automatic pressurization method for return flow of coke dry quenching circulating water pipeline according to claim 8,
the number of the return water branches is two, and the two return water branches are connected in parallel;
when P < P2When one backwater branch fails, the circulating water is backwashed in parallel from the other backwater branch.
10. The coke dry quenching circulating water pipeline backflow automatic pressurization method according to claim 9, characterized in that;
and when the two return water branches are failed, circulating water enters a second heat source cooling pipeline from an outflow pipeline.
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