CN211695094U - Heat exchanger bypass circulating device - Google Patents
Heat exchanger bypass circulating device Download PDFInfo
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- CN211695094U CN211695094U CN202020103524.4U CN202020103524U CN211695094U CN 211695094 U CN211695094 U CN 211695094U CN 202020103524 U CN202020103524 U CN 202020103524U CN 211695094 U CN211695094 U CN 211695094U
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Abstract
The utility model discloses a heat exchanger bypass circulating device, wherein a first bypass pipe is arranged between a return water pipe section of a cut-off valve medium inflow end on a return water branch pipe of each heat exchanger and a medium outflow end outflow branch pipe section of a cut-off valve of an outflow branch pipe; a second bypass pipe is arranged between the water outlet branch pipe section of one heat exchanger after flowing to the first bypass pipe along the medium and the water return branch pipe section of the other heat exchanger before flowing to the first bypass pipe along the medium; the first bypass pipe and the second bypass pipe are respectively provided with a cut-off valve; the scheme solves the problems that when a heat exchanger of a heating part is damaged in winter, the pipeline connected with the damaged heat exchanger cannot circulate hydraulically, so that the pipeline is frost-cracked, and even large-area heating stop is caused.
Description
Technical Field
The invention relates to the field of heat exchangers, in particular to a heat exchanger bypass circulation device.
Background
Winter in northern China is cold, users generally have the demand of heating, the heating is subject to single-family carbon heating, autonomous boiler heating and centralized heating, the autonomous boiler heating and the centralized heating adopt a mode of heating water media to carry out heat conduction type heating, when the heat media are heated, part of the heated water media is converted into steam heat energy, the mode of collecting the part of the steam heat energy in the past is that a condenser is adopted to absorb the part of the steam heat energy, most of the heated water and condensed water are used as part of sources of supplementing the boiler media.
The temperature difference between water supply and return water in a winter centralized heating mode is generally about 20 ℃, the return water needs to return to a boiler of a heat plant for reheating, and the temperature difference between the water supply and the return water meets the bottom at the beginning and the end of heating, so that the return water is introduced into a heat exchanger and then the return water is reheated by using steam heat; however, the heat exchanger is difficult to avoid in the operation process, and when the damaged heat exchanger is stopped and repaired, if the environmental temperature is below zero, pipelines and a heating bag of a non-circulation system can be frozen for more than 3 hours, so that a large area of heating stop accidents are caused.
SUMMERY OF THE UTILITY MODEL
To the technical problem that above-mentioned exists, the utility model provides a heat exchanger bypass circulating device when solving the partial heat exchanger of heating in winter and damaging, causes the pipeline water conservancy of connecting this damage heat exchanger not to circulate, and then causes the pipeline frost crack, causes the problem that the large tracts of land stops warm even.
In order to realize the purpose, the utility model discloses the technical scheme who takes is: a heat exchanger bypass circulation device comprises a steam main pipe, a water return main pipe, a water outlet main pipe and at least two heat exchangers;
each heat exchanger is respectively provided with a steam branch pipe, a water return branch pipe and a water outlet branch pipe, each steam branch pipe is respectively communicated with a steam main pipe, each water return branch pipe is respectively communicated with a water return main pipe, each water outlet branch pipe is respectively communicated with a water outlet main pipe, and the steam main pipe, the water return main pipe, the water outlet main pipe, each steam branch pipe, each water return branch pipe and each water outlet branch pipe are respectively provided with a cut-off valve;
a first bypass pipe is arranged between the medium flow inlet end of the cut-off valve on the return water branch pipe of each heat exchanger and the medium flow outlet end of the cut-off valve of the water outlet branch pipe; a second bypass pipe is arranged between the water outlet branch pipe section of one heat exchanger after flowing to the first bypass pipe along the medium and the water return branch pipe section of the other heat exchanger before flowing to the first bypass pipe along the medium; and the first bypass pipe and the second bypass pipe are respectively provided with a cut-off valve.
Further, in the bypass circulation device of the heat exchanger, the second bypass pipe is also provided with a one-way valve flowing from the water outlet branch pipe to the water return branch pipe.
Furthermore, the bypass circulating device of the heat exchanger is also provided with a throttle valve on the water outlet branch pipe section behind the second bypass pipe along the flow direction of the water outlet branch pipe medium.
Furthermore, in the bypass circulation device of the heat exchanger, each heat exchanger is also provided with a condensed water branch pipe, and each condensed water branch pipe is communicated with the condensed water main pipe.
Further, in the above heat exchanger bypass circulation device, the block valve is any one or a combination of a gate valve, a butterfly valve, a ball valve and a diaphragm valve.
The embodiment of the utility model provides a beneficial effect is:
1. in winter heating, when part of the heat exchanger is damaged, the cutoff valve connected with the return water branch pipe and the water outlet branch pipe of the damaged heat exchanger is closed, and the cutoff valve on the first bypass pipe between the return water branch pipe and the water outlet branch pipe of the damaged heat exchanger is opened at the same time, so that the heat exchanger is maintained, the circulation of a heat medium in a pipeline connected with the damaged heat exchanger can be met, a heating pipeline is effectively protected, and heating stop accidents caused by maintenance can be reduced;
2. when part of the heat exchangers are damaged, after the cutoff valve on the first bypass pipe corresponding to the damaged heat exchanger is opened, the cutoff valve on the second bypass pipe between the water outlet branch pipe of the damaged heat exchanger and the water return branch pipe of the adjacent heat exchanger can be opened simultaneously, so that the circulation of hot media in the corresponding connecting pipeline of the damaged heat exchanger during maintenance can be met, the frost crack of the pipeline is prevented, part of return water passing through the damaged heat exchanger can be sent to the next heat exchanger for secondary heating, the temperature rise of the return water is kept stable as far as possible, and the heating temperature is ensured not to form large fluctuation during the maintenance of part of the heat exchangers.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the heat exchanger bypass circulation device of the present invention.
Reference numerals in the drawings of the specification include: the system comprises a steam main pipe 1, a water return main pipe 2, a water outlet main pipe 3, a check valve 4, a throttle valve 5, a condensate water main pipe 6, a heat exchanger a C1, a heat exchanger b C2, a steam branch pipe a D1, a steam branch pipe D2, a water return branch pipe a E1, a water return branch pipe b E2, a water outlet branch pipe a F1, a water outlet branch pipe b F2, a first bypass pipe a G1, a first bypass pipe b G2, a second bypass pipe a H1, a condensate water branch pipe a K1, a condensate water branch pipe b K2, a block valve a L1, a block valve b L2, a block valve c L3, a block valve dL4, a block valve e L5, a block valve f L6, a block valve g L7, a block valve h L8, a block valve i L9, a block valve j L10, a block valve kL11, a block valve m L12, a block valve n L13 and a block valve r L14.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1: with reference to FIG. 1
The scheme provides a heat exchanger bypass circulating device which comprises a steam main pipe 1, a water return main pipe 2, a water outlet main pipe 3 and at least two heat exchangers;
each heat exchanger is respectively provided with a steam branch pipe, a water return branch pipe and a water outlet branch pipe, each steam branch pipe is respectively communicated with a steam main pipe 1, each water return branch pipe is respectively communicated with a water return main pipe 2, each water outlet branch pipe is respectively communicated with a water outlet main pipe 3, and the steam main pipe 1, the water return main pipe 2, the water outlet main pipe 3 and each steam branch pipe, each water return branch pipe and each water outlet branch pipe are respectively provided with a cut-off valve;
a first bypass pipe is arranged between the medium flow inlet end of the cut-off valve on the return water branch pipe of each heat exchanger and the medium flow outlet end of the cut-off valve of the water outlet branch pipe; a second bypass pipe is arranged between the water outlet branch pipe section of one heat exchanger after flowing to the first bypass pipe along the medium and the water return branch pipe section of the other heat exchanger before flowing to the first bypass pipe along the medium; and the first bypass pipe and the second bypass pipe are respectively provided with a cut-off valve.
This embodiment is shown in FIG. 1: specifically, two heat exchangers are provided, namely a heat exchanger a C1 and a heat exchanger bC2, and a steam branch pipe a D1, a steam branch pipe b D2, a return water branch pipe a E1, a return water branch pipe b E2, a water outlet branch pipe a F1, a water outlet branch pipe b F2, a first bypass pipe a G1, a first bypass pipe b G2 and a second bypass pipe a H1 are arranged corresponding to the two heat exchangers; a block valve a L1 is arranged on the steam main pipe 1, a block valve b L2 is arranged on the steam branch pipe a D1, a block valve c L3 is arranged on the steam branch pipe b D2, a block valve d L4 is arranged on the water return branch pipe a E1, a block valve e L5 is arranged on the water outlet branch pipe a F1, a block valve f L6 is arranged on the water return branch pipe b E2, a block valve g L7 is arranged on the water outlet branch pipe b F2, a block valve h L8 is arranged on the water return main pipe 2, a block valve I L9 is arranged on the water outlet main pipe 3, a block valve j L10 is arranged on the first bypass pipe a G1, a block valve k L11 is arranged on the first bypass pipe b G2, and a block valve m L12 is arranged on the second bypass pipe a H1; the above devices are specifically illustrated in detail for convenience of description of the subsequent working process;
the normal heating operation mode in winter by using the heat exchanger bypass device is as follows:
firstly, the block valve d L4, the block valve e L5, the block valve f L6, the block valve g L7, the block valve h L8 and the block valve i L9 are opened, heating backwater respectively enters the heat exchanger a C1 and the heat exchanger b C2, then, the cut-off valve b L2, the cut-off valve c L3 and the cut-off valve a L1 are opened in sequence, the steam heat source is led into the heat exchanger a C1 and the heat exchanger b C2, the heating backwater of each heat exchanger absorbs the energy of the steam heat source to obtain secondary heating, the secondary heating backwater is conveyed through the water outlet branch pipe a F1 and the water outlet branch pipe bF2 to be converged into the water outlet main pipe 3, then the water is sent to a heating area to be used as the water supply for secondary heating, and the steam entering the heat exchanger a C1 and the heat exchanger b C2 is absorbed by heating backwater to become condensed water, and then the condensed water is discharged through condensed water discharge ports of the heat exchanger a C1 and the heat exchanger b C2.
When the heat exchanger bypass device is partially damaged during normal operation and needs to be repaired, such as when the heat exchanger a C1 is damaged:
in normal operation, the switching of the various parts of the apparatus, as described above, when the maintenance phase of the heat exchanger a C1 is damaged,
first, shut-off valve b L2 is closed, the steam heat source is stopped from being delivered into heat exchanger a C1, then, the shut-off valve d L4 and the shut-off valve e L5 are closed to ensure that no water enters the heat exchanger a C1, and the first bypass pipe a G1 is opened, and then a medium circulation pipeline which is supplied to the heat exchanger a C1 through the return water branch pipe a E1 and then outputs water to the water outlet branch pipe a F1 through the heat exchanger a C1 during normal work is communicated through a first bypass pipe a G1, the circulation of media in return water branch a E1 and outlet water branch a F1 during servicing of damaged heat exchanger a C1 may be maintained, thereby ensuring that certain temperature is kept in pipelines of the water return branch pipe a E1 and the water outlet branch pipe a F1 which are respectively connected with the heat exchanger a C1 during the maintenance of the heat exchanger a C1 so as to enable the medium to flow, thereby reducing or avoiding the potential for frost cracking of the connected pipeline media during repairs to damage the heat exchanger aC1 and the potential for extensive warm-up of a partial heating area.
In addition, if the outdoor temperature is not particularly low, for example, 0 ℃, the backwater medium circulated to the water outlet pipe a F1 through the first bypass pipe a G1 is correspondingly not subjected to secondary heating, so that the temperature of the supplied water for secondary heating does not reach the standard, and the heating effect is obviously changed during maintenance; a cut-off valve m L12 on the second bypass pipe a H1 can be opened, at the moment, part of the heating heat medium passing through the water outlet branch pipe a F1 is converged into a water return branch pipe b E2 through the second bypass pipe a H1, and then secondary heating is carried out on a heat exchanger bC2, so that secondary heating is carried out on the heating water through the other heat exchanger bC2 when the heat exchanger a C1 is damaged and maintained, in addition, only part of the heating water flow is reserved in the water outlet branch pipe a F1, and the heat medium in the water return branch pipe a E1 and the water outlet branch pipe a F1 is kept from being frozen during maintenance; the circulating system can meet the requirement of hot medium circulation in the corresponding connecting pipeline when the damaged heat exchanger is maintained, prevents the pipeline from frost cracking, and can also convey part of return water passing through the damaged heat exchanger to the next heat exchanger for reheating, thereby keeping the temperature rise of the return water as stable as possible and ensuring that the heating temperature cannot form large fluctuation during the maintenance of part of the heat exchanger.
Example 2: with reference to FIG. 1
Compared with the embodiment 1, the difference is that the second bypass pipe is also provided with the check valve 4 flowing from the water outlet branch pipe to the water return branch pipe, as in the example of the embodiment 1, after the cut-off valve m L12 on the second bypass pipe a H1 is opened, only the heat medium in the water outlet branch pipe a F1 is allowed to flow to the water outlet branch pipe b F2 of the heat exchanger b C2, and the phenomenon that the medium in the water return branch pipe bE2 flows back to the water outlet branch pipe a F1 due to pressure fluctuation is avoided, so that part of the heat supply return water to bE heated in the water return branch pipe b E2 enters a secondary heating stage without secondary heating, and the heating does not reach the standard; the amount of secondary heating of the heat supply backwater passing through the heat exchanger b C2 is ensured during the maintenance of the heat exchanger a C1, so that the temperature rise of the backwater is kept stable, and the heating temperature is ensured not to form large fluctuation during the maintenance of part of the heat exchangers.
Example 3: with reference to FIG. 1
Compared with the embodiment, the difference is that a throttling valve 5 is also arranged on the water outlet branch pipe section behind the second bypass pipe along the medium flow direction of the water outlet branch pipe; the throttle valve 5 can accurately control the amount of heat supply return water finally passing through the water outlet branch pipe, when the heat exchanger a C1 is maintained, the throttle valve 5 can be controlled according to the external environment temperature condition to further adjust the amount of heat supply return water passing through the water outlet branch pipe a F1, so that the water outlet amount of the water outlet branch pipe a F1 is reduced as far as possible under the condition that the pipeline is not frost-cracked due to medium flow, the medium amount entering the water return branch pipe b E2 and sent to the next heat exchanger for reheating is increased, the temperature rise of the return water is kept stable as far as possible, and the heating temperature cannot form large heating fluctuation during the maintenance of the heat exchanger a C1.
Example 4: with reference to FIG. 1
Compared with the above embodiment, the difference is that each heat exchanger is also provided with a condensed water branch pipe, each condensed water branch pipe is communicated with the condensed water main pipe 6, and each condensed water branch pipe is provided with a cut-off valve.
When two heat exchangers are adopted as in example 1, a condensed water branch tube a K1 is arranged on the heat exchanger a C1, a cutoff valve n L13 is arranged on the condensed water branch tube a, a condensed water branch tube b K2 is arranged on the heat exchanger b C2, and a cutoff valve r L14 is arranged on the condensed water branch tube b K2;
the condensed water branch pipe a K1 and the condensed water branch pipe b K2 can be connected with a condensed water main pipe, and then condensed water is guided into a sewage well through the condensed water main pipe; when the heat exchanger a C1 is damaged, the cut-off valve nL13 on the condensed water branch pipe a K1 can be closed to completely isolate the heat exchanger a C1 for maintenance, and only when the heat exchanger b C2 is kept running, the cut-off valve r L14 on the condensed water branch pipe b K2 is opened to discharge the generated condensed water.
The block valve can adopt any one or more of a gate valve, a butterfly valve, a ball valve and a diaphragm valve, and can be flexibly selected according to actual conditions.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. A heat exchanger bypass circulating device is characterized by comprising a steam main pipe (1), a water return main pipe (2), a water outlet main pipe (3) and at least two heat exchangers;
each heat exchanger is respectively provided with a steam branch pipe, a water return branch pipe and a water outlet branch pipe, each steam branch pipe is respectively communicated with a steam main pipe (1), each water return branch pipe is respectively communicated with a water return main pipe, each water outlet branch pipe is respectively communicated with a water outlet main pipe (3), and the steam main pipe (1), the water return main pipe (2), the water outlet main pipe (3) and each steam branch pipe, each water return branch pipe and each water outlet branch pipe are respectively provided with a cut-off valve;
a first bypass pipe is arranged between a return water branch pipe section at the medium inflow end of the cut-off valve of the return water branch pipe of each heat exchanger and a water outlet branch pipe section at the medium outflow end of the cut-off valve of the water outlet branch pipe; a second bypass pipe is arranged between the water outlet branch pipe section of one heat exchanger after flowing to the first bypass pipe along the medium and the water return branch pipe section of the other heat exchanger before flowing to the first bypass pipe along the medium; and the first bypass pipe and the second bypass pipe are respectively provided with a cut-off valve.
2. The heat exchanger bypass circulation device according to claim 1, wherein: and a one-way valve (4) flowing from the water outlet branch pipe to the water return branch pipe is also arranged on the second bypass pipe.
3. The heat exchanger bypass circulation device according to claim 1 or 2, wherein: a throttle valve (5) is also arranged on the water outlet pipe section behind the second bypass pipe along the medium flow direction of the water outlet pipe.
4. The heat exchanger bypass circulation device according to claim 1 or 2, wherein: each heat exchanger is also provided with a condensed water branch pipe, each condensed water branch pipe is communicated with a condensed water main pipe (6), and each condensed water branch pipe is provided with a cut-off valve.
5. The heat exchanger bypass circulation device according to claim 1 or 2, wherein: the block valve is any one of a gate valve, a butterfly valve, a ball valve and a diaphragm valve.
6. The heat exchanger bypass circulation device according to claim 3, wherein: the block valve is any one of a gate valve, a butterfly valve, a ball valve and a diaphragm valve.
7. The heat exchanger bypass circulation device according to claim 4, wherein: the block valve is any one of a gate valve, a butterfly valve, a ball valve and a diaphragm valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019219996050 | 2019-11-18 | ||
| CN201921999605 | 2019-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211695094U true CN211695094U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020103524.4U Active CN211695094U (en) | 2019-11-18 | 2020-01-16 | Heat exchanger bypass circulating device |
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| CN (1) | CN211695094U (en) |
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2020
- 2020-01-16 CN CN202020103524.4U patent/CN211695094U/en active Active
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