CN211551744U - Heat exchange unit suitable for increasing heating load year by year - Google Patents
Heat exchange unit suitable for increasing heating load year by year Download PDFInfo
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- CN211551744U CN211551744U CN201922444445.XU CN201922444445U CN211551744U CN 211551744 U CN211551744 U CN 211551744U CN 201922444445 U CN201922444445 U CN 201922444445U CN 211551744 U CN211551744 U CN 211551744U
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Abstract
The utility model belongs to the field of heat supply units, and relates to a heat exchange unit suitable for year-by-year increase of heating load, which is arranged between a primary network and a secondary network and comprises a heat exchange water outlet pipe and a heat exchange water inlet pipe which are communicated with a unit heat exchanger, wherein the heat exchange water outlet pipe is communicated with a secondary network water supply pipe through a water supply circulating pump, and one side of the water supply circulating pump is connected with a first bypass valve in parallel; the heat exchange water inlet pipe is communicated with a secondary network water return pipe through a water return circulating pump, and one side of the water return circulating pump is connected with a bypass valve II in parallel; the heat exchange water outlet pipe is communicated with the secondary network water return pipe through a water mixing pipe, and a water mixing valve is arranged on the water mixing pipe. The utility model discloses according to the different water pump compound mode of accord with the condition selection of difference, satisfy circulating water pump lift and second grade net hydraulic work condition phase-match, satisfy the heating demand to reach energy saving and consumption reduction's effect.
Description
Technical Field
The utility model relates to a heat exchanger unit that suitable heating load increases year by year belongs to the heat supply unit field.
Background
In northern areas, central heating is adopted in winter, and a heat exchange station cannot be left for realizing central heating. And a heat exchange unit is adopted in the heat exchange station to obtain heat from the primary network, and the heat is automatically and continuously converted into secondary network hot water required by a user. Most of heat exchanger units used at present carry out the model selection according to the full load in this heat supply region, and wherein circulating water pump calculates the model selection according to design flow, therefore water pump flow and lift numerical value are all generally great to generally can connect standby water pump in parallel on circulating water pump one side. This type selection has the following disadvantages:
(1) in a new heating area, along with the annual increase of the survival rate, the heating area required by the corresponding heat exchange station increases annually, the survival rate is low in the first few years, the heating area required is small, and the heating area is gradually increased from the 6 th heating season and tends to be stable, so that the conventional unit circulating water pump is in the working condition low-efficiency area for a long time, the circulating efficiency is low, and the equipment power consumption is high;
(2) during the annual increase of the heating area, the lift of the circulating water pump cannot be matched with the hydraulic working condition of the secondary network;
(3) the system is complicated by the provision of the backup device.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the heat exchange unit suitable for the year-by-year increase of the heating load is provided, different water pump combination modes are selected according to different conforming conditions of the heat exchange unit suitable for the year-by-year increase of the heating load, the pump lift of a circulating water pump is matched with the hydraulic condition of a secondary network, the heating requirement is met, and the effects of energy conservation and consumption reduction are achieved.
The heat exchange unit suitable for the year-by-year increase of heating load is arranged between a primary network and a secondary network and comprises a heat exchange water outlet pipe and a heat exchange water inlet pipe which are communicated with a unit heat exchanger, wherein the heat exchange water outlet pipe is communicated with a secondary network water supply pipe through a water supply circulating pump, and one side of the water supply circulating pump is connected with a first bypass valve in parallel; the heat exchange water inlet pipe is communicated with a secondary network water return pipe through a water return circulating pump, and one side of the water return circulating pump is connected with a bypass valve II in parallel; the heat exchange water outlet pipe is communicated with the secondary network water return pipe through a water mixing pipe, and a water mixing valve is arranged on the water mixing pipe.
The primary net is communicated with a cooling pipeline of the unit heat exchanger, and the heat exchange water outlet pipe and the heat exchange water inlet pipe are communicated with a heating pipeline of the unit heat exchanger. The unit heat exchanger area of the heat exchange unit is selected according to design load and design allowance is reserved, the water supply circulating pump and the return water circulating pump respectively adopt different-lift water pumps, the flow of the return water circulating pump is selected according to 40% -60% of the design flow of the system, and the flow of the water supply circulating pump is selected according to 100% of the design flow of the system. The return water circulating pump lift takes the flow resistance loss value in the heat exchanger of the unit, and the water supply circulating pump lift takes the resistance loss value except the internal resistance of the heat exchanger of the unit. The water supply circulating pump and the water return circulating pump can be operated independently or in series.
When the heating load is lower than 35% of the design load, a return water circulating pump is started to operate independently, a second bypass valve and a water mixing valve are closed, return water of a second-level network flows through the return water circulating pump and a unit heat exchanger, flows through the first bypass valve after the temperature rises, and supplies heat to a user system through a second-level network water supply pipe; when the heating load is lower than 65% of the design load, the water supply circulating pump is started to operate independently, the first bypass valve and the water mixing valve are closed, the second-level net return water flows through the second bypass valve and the unit heat exchanger, flows through the water supply circulating pump after the temperature is increased, and supplies heat to a user system through the second-level net water supply pipe; when the heating load is higher than 65% of the design load, the return water circulating pump and the water supply circulating pump run simultaneously, the first bypass valve and the second bypass valve are closed, the water mixing valve is opened, 1/2 of the total return water flow in the secondary network return water pipe flows through the return water circulating pump and the unit heat exchanger in sequence, 1/2 of the total return water flow in the secondary network return water pipe flows through the water mixing valve, the mixed temperature in the heat exchange water outlet pipe rises, then the mixed temperature flows through the water supply circulating pump, and finally the heat is supplied to a user system through the secondary network water supply.
Preferably, a dirt separator is additionally arranged on the secondary net water return pipe, the dirt separator is arranged between the water inlet of the water mixing pipe and the secondary net, and impurities in the secondary net water return pipe are mainly removed through the dirt separator.
Preferably, a secondary network water return pipe between the dirt separator and the water mixing pipe water inlet is connected with a water replenishing pump through a water replenishing pipe, and a check valve is arranged between the water replenishing pump and the secondary network water return pipe. The flow of the water replenishing pump is selected according to 2% of the designed flow of the system, and when the return water pressure of the secondary network is smaller than a set value, the water replenishing pump works to replenish water into the return water pipe of the secondary network.
Preferably, the outlet of the secondary network water supply pipe and the inlet of the secondary network water return pipe are respectively provided with a first switch valve and a second switch valve, and when a special condition occurs, the primary network and the secondary network can be isolated and are in an open state under a normal condition.
Compared with the prior art, the utility model beneficial effect who has is:
(1) the system is suitable for the condition that the heating load increases year by year, different water pump combination modes are selected according to the current actual heating load, the matching of the lift of the circulating water pump and the hydraulic condition of the secondary network is met, the flow and the lift of the water pump can be matched with the hydraulic characteristic curve of the system, the operating working condition point is close to the designed working condition point of the operating working condition point, so that the water pump works in a high-efficiency area, and the operation is safe and reliable;
(2) under the working condition that the heating load accounts for more than 65% of the design load, the flow passing through the heat exchanger of the unit is 1/2 of the total design flow, the rest return water enters the water supply circulating pump through the water mixing valve, the lift of the return water circulating pump only overcomes the resistance of the heat exchanger of the unit, the energy-saving and electricity-saving effects are good, and compared with the traditional process, the energy-saving effect is calculated to be more than 15%;
(3) spare equipment does not need to be arranged in the heat exchange unit, the system is simple and reliable, and the minimum heat supply guarantee rate under the accident condition can be still met by 50%;
(4) the heat exchange unit integrates equipment, a metering instrument, an automatic control system and the like, and has the advantages of compact structure, convenient operation, safety, reliability and small occupied area.
Drawings
FIG. 1 is a schematic diagram of a heat exchanger unit suitable for year-by-year increase of heating load.
In the figure: 1. a primary network; 2. a unit heat exchanger; 3. a heat exchange water outlet pipe; 4. a water mixing valve; 5. a water supply circulation pump; 6. a first bypass valve; 7. a secondary net water supply pipe; 8. a first switch valve; 9. a secondary network; 10. a second switch valve; 11. a secondary net water return pipe; 12. a dirt separator; 13. a check valve; 14. a water replenishing pump; 15. a backwater circulating pump; 16. a second bypass valve; 17. a heat exchange water inlet pipe; 18. a water mixing pipe.
Detailed Description
The invention will be further described with reference to the accompanying drawings:
as shown in fig. 1, the heat exchange unit suitable for year-by-year increase of heating load of the utility model is arranged between a first-stage network 1 and a second-stage network 9, and comprises a heat exchange water outlet pipe 3 and a heat exchange water inlet pipe 17 which are communicated with a unit heat exchanger 2, wherein the heat exchange water outlet pipe 3 is communicated with a second-stage network water supply pipe 7 through a water supply circulating pump 5, and one side of the water supply circulating pump 5 is connected with a bypass valve 6 in parallel; the heat exchange water inlet pipe 17 is communicated with the secondary-network water return pipe 11 through a water return circulating pump 15, and one side of the water return circulating pump 15 is connected with a second bypass valve 16 in parallel; the heat exchange water outlet pipe 3 is communicated with the secondary network water return pipe 11 through a water mixing pipe 18, and the water mixing pipe 18 is provided with a water mixing valve 4.
In this embodiment:
add dirt separator 12 on second grade net wet return 11, dirt separator 12 sets up and mixes between 18 water inlets of water pipe and second grade net 9, and the setting of dirt separator 12 mainly gets rid of the impurity in the second grade net wet return 11.
The second-stage net water return pipe 11 between the dirt separator 12 and the water mixing pipe 18 is connected with a water replenishing pump 14 through a water replenishing pipe, and a check valve 13 is arranged between the water replenishing pump 14 and the second-stage net water return pipe 11. The flow of the water replenishing pump 14 is selected according to 2% of the designed flow of the system, and when the return water pressure of the secondary network 9 is smaller than a set value, the water replenishing pump 14 works to replenish water into the return water pipe 11 of the secondary network.
The outlet of the second-level network water supply pipe 7 and the inlet of the second-level network water return pipe 11 are respectively provided with a first switch valve 8 and a second switch valve 10, when a special condition occurs, the first-level network 1 and the second-level network 9 can be isolated, and the first-level network and the second-level network are in an open state under a normal condition.
The primary network 1 is communicated with a cooling pipeline of the unit heat exchanger 2, and the heat exchange water outlet pipe 3 and the heat exchange water inlet pipe 17 are communicated with a heating pipeline of the unit heat exchanger 2. The area of a unit heat exchanger 2 of the heat exchange unit is selected according to design load and design allowance is reserved, a water supply circulating pump 5 and a return water circulating pump 15 respectively select different-lift water pumps, the flow of the return water circulating pump 15 is selected according to 40% -60% of the design flow of a system, and the flow of the water supply circulating pump 5 is selected according to 100% of the design flow of the system. The return water circulating pump 15 lift takes the internal flow resistance loss value of the unit heat exchanger 2, and the water supply circulating pump 5 lift takes the resistance loss value except the internal resistance of the unit heat exchanger 2. The water supply circulating pump 5 and the water return circulating pump 15 may be operated individually or in series.
When the heating load is lower than 35% of the design load, the return water circulating pump 15 is started to operate independently, the bypass valve II 16 and the water mixing valve 4 are closed, the return water of the secondary network 9 flows through the dirt separator 12, the return water circulating pump 15 and the unit heat exchanger 2 in sequence, flows through the bypass valve I6 after the temperature rises, and supplies heat to a user system through the secondary network water supply pipe 7; when the heating load is lower than 65% of the design load, the water supply circulating pump 5 is started to operate independently, the first bypass valve 6 and the water mixing valve 4 are closed, the return water of the secondary network 9 sequentially flows through the dirt separator 12, the second bypass valve 16 and the unit heat exchanger 2, flows through the water supply circulating pump 5 after the temperature is increased, and supplies heat to a user system through the water supply pipe 7 of the secondary network; when the heating load is higher than 65% of the design load, the return water circulating pump 15 and the water supply circulating pump 5 run simultaneously, the first bypass valve 6 and the second bypass valve 16 are closed, the water mixing valve 4 is opened, 1/2 of the total return water flow in the secondary network water return pipe 11 sequentially flows through the dirt separator 12, the return water circulating pump 15 and the unit heat exchanger 2, 1/2 of the total return water flow in the secondary network water return pipe 11 flows through the water mixing valve 4, the mixed temperature in the heat exchange water outlet pipe 3 rises and then flows through the water supply circulating pump 5, and finally the heat is supplied to a user system through the secondary network water supply pipe 7.
Claims (4)
1. The utility model provides a heat exchanger group that suitable heating load increases year by year, sets up between one-level net (1) and second grade net (9), its characterized in that: the heat exchanger comprises a heat exchange water outlet pipe (3) and a heat exchange water inlet pipe (17) which are communicated with a unit heat exchanger (2), wherein the heat exchange water outlet pipe (3) is communicated with a secondary network water supply pipe (7) through a water supply circulating pump (5), and one side of the water supply circulating pump (5) is connected with a first bypass valve (6) in parallel; the heat exchange water inlet pipe (17) is communicated with a secondary network water return pipe (11) through a water return circulating pump (15), and one side of the water return circulating pump (15) is connected with a second bypass valve (16) in parallel; the heat exchange water outlet pipe (3) is communicated with the secondary network water return pipe (11) through a water mixing pipe (18), and the water mixing pipe (18) is provided with a water mixing valve (4).
2. The heat exchanger unit suitable for annual heating load increase according to claim 1, characterized in that: a dirt separator (12) is additionally arranged on the secondary net water return pipe (11), and the dirt separator (12) is arranged between the water inlet of the water mixing pipe (18) and the secondary net (9).
3. The heat exchanger unit suitable for annual heating load increase according to claim 2, characterized in that: the secondary net water return pipe (11) between the dirt separator (12) and the water inlet of the water mixing pipe (18) is connected with a water replenishing pump (14) through a water replenishing pipe, and a check valve (13) is arranged between the water replenishing pump (14) and the secondary net water return pipe (11).
4. A heat exchanger unit adapted to accommodate an annual increase in heating load according to any one of claims 1 to 3, wherein: and a first switch valve (8) and a second switch valve (10) are respectively arranged at the outlet of the second-stage network water supply pipe (7) and the inlet of the second-stage network water return pipe (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922444445.XU CN211551744U (en) | 2019-12-27 | 2019-12-27 | Heat exchange unit suitable for increasing heating load year by year |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922444445.XU CN211551744U (en) | 2019-12-27 | 2019-12-27 | Heat exchange unit suitable for increasing heating load year by year |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211551744U true CN211551744U (en) | 2020-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922444445.XU Active CN211551744U (en) | 2019-12-27 | 2019-12-27 | Heat exchange unit suitable for increasing heating load year by year |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211551744U (en) |
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2019
- 2019-12-27 CN CN201922444445.XU patent/CN211551744U/en active Active
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