CN215412076U - Drainage heat utilization system of heat supply network heat supply heater - Google Patents
Drainage heat utilization system of heat supply network heat supply heater Download PDFInfo
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- CN215412076U CN215412076U CN202121783318.3U CN202121783318U CN215412076U CN 215412076 U CN215412076 U CN 215412076U CN 202121783318 U CN202121783318 U CN 202121783318U CN 215412076 U CN215412076 U CN 215412076U
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Abstract
The utility model discloses a drainage heat utilization system of a heat supply network heat supply heater, which comprises a plant area heating module, a drainage water collecting module used for connecting a drainage outlet of the heat supply heater, and a primary heat exchanger connected between the drainage water collecting module and the plant area heating module, wherein the primary heat exchanger is used for heating the heating return water of the plant area heating module by utilizing the drainage of the heat supply heater. The drainage heat utilization system of the heat supply network heat supply heater can effectively utilize drainage heat of the heat supply heater, reduce modification cost and system maintenance cost, and improve economical efficiency and operation reliability of a heat supply unit.
Description
Technical Field
The utility model relates to the technical field of waste heat utilization of power plants, in particular to a drainage heat utilization system of a heat supply network heat supply heater.
Background
In order to improve the economy of large-scale thermal power generating units, most of the large-scale thermal power generating units are heat supply units or heat supply modified units. Most of the heating units use the drainage heat of the heating heater for heating the condensed water through the water heater, thereby improving the economy of the heating units. Although the method can improve the temperature of the condensed water and has certain recycling of the hydrophobic heat of the heater, the quality requirement of the water heater is high because the pressure difference between the two sides of the water heater is too large, the flow rate of the condensed water is high, the water heater can be normally put into the water heater only in a heating period, the corrosion-resistant pressure is high, and the heater can possibly leak when the water heater is operated for a long time. Especially, the installation position of a water heater and the arrangement of pipelines are difficult to solve for a heat supply reconstruction unit. For the heat supply unit reformed by the straight condensing unit, the position of the water heater is not designed at first, and the position and the pipeline arrangement are problems to be newly installed, particularly, the system is additionally installed and needs to be redesigned, the unit is required to be stopped during installation, and the reformation cost is increased.
How to improve the economy of the utilization of the hydrophobic heat of the heating network and the heating heater becomes a technical problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a drainage heat utilization system of a heat supply network heater, which can effectively utilize drainage heat of the heat supply heater, reduce the reconstruction cost and the system maintenance cost, and improve the economic efficiency and the operation reliability of a unit.
In order to achieve the purpose, the utility model provides a drainage heat utilization system of a heat supply network heat supply heater, which comprises a plant area heating module, a drainage water collecting module used for connecting a drainage outlet of the heat supply heater, and a primary heat exchanger connected between the drainage water collecting module and the plant area heating module, wherein the primary heat exchanger is used for heating return water of the plant area heating module by utilizing drainage of the heat supply heater.
Optionally, the hydrophobic water collection module includes a hydrophobic water collection tank and a hydrophobic pump connected between the hydrophobic water collection tank and the hot side of the primary heat exchanger.
Optionally, the plant heating module includes:
the heating water collecting tank is used for collecting heating backwater and is connected with the cold side of the primary heat exchanger in series;
the cold side of the heating heater is connected with the cold side of the primary heat exchanger in series, and the hot side of the heating heater is used for introducing heating steam to heat the cold side of the primary heat exchanger for drainage;
the heating water supply header is connected with a cold side outlet of the heating heater in series and used for supplying heating hot water to a pipe network of the plant area heating module;
and the heating circulating pump is connected between the primary heat exchanger and the heating heater.
Optionally, the heat exchanger further comprises a secondary heat exchanger, a hot side of the secondary heat exchanger is connected in series with a hot side of the primary heat exchanger, and a cold side of the secondary heat exchanger is used for introducing open circulating water.
Optionally, the cold side of the primary heat exchanger is connected in parallel with a primary bypass, the primary bypass is provided with a first bypass valve, the inlet and outlet of the cold side of the primary heat exchanger are provided with first shut-off valves, and the primary bypass is connected with the heating water collection tank and the heating circulating pump.
Optionally, the hot side of the secondary heat exchanger is connected in parallel with a secondary bypass, the secondary bypass is provided with a second bypass valve, and the inlet and the outlet of the hot side of the secondary heat exchanger are provided with a second shutoff valve.
Optionally, the plant heating module further comprises a water replenishing tank connected with the heating heater.
Optionally, a temperature detection mechanism and a flow detection mechanism are arranged between the drainage water collecting tank and the primary heat exchanger.
Compared with the prior art, the drainage heat utilization system of the heat supply network heater provided by the utility model collects drainage of the heat supply heater by using the drainage water collection module, and utilizes drainage waste heat to heat heating return water of a plant area heating module of a power plant by the aid of the additionally arranged primary heat exchanger; the heating return water pressure of a heating module in a plant area is usually maintained at about 0.4MPa and is close to the drainage pressure of 0.2-0.4MPa, so that the quality requirement on a primary heat exchanger is reduced; the problem that a water-water heat exchanger for heating condensed water is difficult to add in a heat supply reconstruction unit is solved; the primary heat exchanger is used for heating the heating return water of the heating module in the plant area, but not used for heating the condensed water of the heat supply unit to provide the water supply temperature of the unit, the operation flow of the unit is not influenced, the shutdown reconstruction is not needed, and the reconstruction cost is reduced; the plant heating module, the heat supply unit and the heat supply heater are synchronously put into use in the heating period, and the heat supply heater and the plant heating module are synchronously stopped in the heating stop period, so that the phenomenon that condensed water flows through the primary heat exchanger is avoided, and the corrosion prevention of the primary heat exchanger is facilitated; the drain heat of the heat supply heater is utilized to heat the heating return water of the heating module in the plant area, so that the steam consumption of the heating module in the plant area is reduced, and the steam consumption rate of the plant area and the economy of the heat supply unit are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a system diagram of a hydrophobic heat utilization system of a heating network heating heater according to an embodiment of the present invention.
Wherein:
01-a heating heater;
1-a drainage water collecting tank, 2-a drainage pump, 3-a primary heat exchanger, 4-a secondary heat exchanger, 5-a condenser, 6-a heating water collecting tank, 7-a water supplementing tank, 8-a heating circulating pump, 9-a heating heater and 10-a heating water supply tank;
31-a first bypass valve, 32-a first shutoff valve, 41-a second bypass valve, 42-a second shutoff valve, 71-a water replenishing pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
As the heat supply area of the Huaneng thermal power plant is increased, three heat supply heaters 01 need to be added to a heat supply network, and a large amount of drained water of the heat supply heaters 01 cannot be cooled and utilized, so that the water-water heat exchanger is difficult to modify and increase to heat condensed water; the heat supply network heating heater drainage heat utilization system is provided in particular in view of the fact that the open circulating water is initially adopted to drain the water of the heating heater 01 at the temperature of about 80 ℃ and then the water is discharged into the condenser 5, heat waste is caused, the temperature of the circulating open cooling water is increased, and the operation of a single open cooling water pump adopted in winter is influenced.
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a system diagram of a hydrophobic heat utilization system of a heating network heating heater according to an embodiment of the present invention.
The utility model provides a drainage heat utilization system of a heat supply network heater, which comprises a drainage water collecting module, a plant area heating module and a primary heat exchanger 3. The drainage of the heat supply heater 01 is collected by the drainage and water collection module, heat exchange is carried out between the drainage of the heat supply heater 01 and heating return water of a plant heating module through the primary heat exchanger 3, the temperature of the heating return water is improved while the drainage and cooling of the heat supply heater 01 are carried out, the steam consumption of plant heating steam is reduced, and the running economy of a unit is improved. The first-level heat exchanger 3 is convenient to arrange, does not influence the operation of a heat supply unit, and reduces the reconstruction cost. After the heating period, the heat supply heater 01 stops running, and the heating module in the plant area also stops running, so that the first-stage heat exchanger 3 is convenient to maintain and is corrosion-resistant.
The hydrophobic heat utilization system of the heating network heating heater provided by the utility model is described in more detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the hydrophobic water collection module specifically includes a hydrophobic water collection tank 1 and a hydrophobic pump 2, and the hydrophobic water collection tank 1 is connected to hydrophobic outlets of a plurality of heating heaters 01 for collecting hydrophobic water. The drain pump 2 is connected with the drain water collecting tank 1, hot water in the drain water collecting tank 1 is conveyed to the hot side of the primary heat exchanger 3 to exchange heat with low-temperature heating backwater of the plant area heating module, and the temperature of the heating backwater is increased.
The heating module in the plant area comprises a heating water collecting header 6, a heating heater 9 and a heating water supply header 10. The water inlet of the heating water collecting tank 6 is used for recovering heating backwater in a plant area, a factory building, a coal bunker and the like, the water outlet of the heating water collecting tank 6 is communicated with the cold side water inlet of the first-stage heat exchanger 3, low-temperature heating backwater is preliminarily heated and heated, the heat absorbed by the heating heater 9 in the process of heating backwater circulation is reduced, and the steam consumption of heating steam at the heating heater 9 is also reduced.
The heating circulating pump 8 is connected to the cold side delivery port of one-level heat exchanger 3, and the heating circulating water that will primarily exchange heat through one-level heat exchanger 3 heaies up lets in the cold side of heating heater 9 through heating circulating pump 8, and the hot side of heating heater 9 then is used for letting in heating steam, and heating steam condenses into the hot side export of following heating heater 9 after for hydrophobic with the heating circulating water heat exchange at heating heater 9 department and discharges. The outlet of the cold side of the heating heater 9 is connected to a heating water supply header 10, the outlet of the heating water supply header 10 is connected to a plant area heat supply network pipeline, and the heating water supply header 6 is conveyed back after the circulation of the heat supply network pipeline. A flow detection mechanism and a temperature detection mechanism can be arranged between the drainage water collecting tank 1 and the drainage pump 2, and the running frequency of the heating circulating water pump is adjusted by detecting the drainage flow and the drainage temperature transmitted to the primary heat exchanger 3.
In the above embodiment, the cold side of the primary heat exchanger 3 is connected in parallel with the primary bypass, and the first shut-off valve 32 is disposed at the water inlet and the water outlet of the cold side of the primary heat exchanger 3. When the primary heat exchanger 3 is put into operation, the first shutoff valves 32 of the cold side water inlet and the cold side water outlet of the primary heat exchanger 3 are both opened, and the first bypass valve 31 arranged at the primary bypass is in a closed state. When the primary heat exchanger 3 needs to be overhauled and maintained, the first shutoff valve 32 at the cold side water inlet and the water outlet of the primary heat exchanger 3 is only required to be closed, and the first bypass valve 31 is opened. The low-temperature heating circulating water/heating backwater flowing out of the heating water collection tank 6 does not pass through the first-stage heat exchanger 3, but directly flows to the heating heater 9 through the heating circulating pump 8 to exchange heat and raise the temperature.
Furthermore, the drainage heat utilization system of the heat supply network heating heater further comprises a water supplementing tank 7, the water supplementing tank 7 is connected to the heating heater 9 through a heating circulating water pump of a water supplementing pump 71, heating circulating water is supplemented to the heating module of the plant area, and the phenomenon that the normal operation of the heating module of the plant area is influenced by the leakage/loss of the heating circulating water is avoided.
In order to optimize the embodiment, the drainage heat utilization system of the heat supply network heater further comprises a secondary heat exchanger 4, a hot side water inlet of the secondary heat exchanger 4 is connected with a hot side water outlet of the primary heat exchanger 3, and a hot side water outlet of the secondary heat exchanger 4 is connected with the condenser 5. The heat supply heater 01 after exchanging heat with the heating circulating water in the factory still possesses certain temperature through hydrophobic the setting secondary heat exchanger 4, lets in open circulating water to the cold side of secondary heat exchanger 4 in this application, utilizes open circulating water to further cool down the hydrophobic of heat supply heater 01, utilizes the hydrophobic after the cooling to cool off condenser 5, maintains the vacuum of condenser 5, guarantees unit operating efficiency. Meanwhile, as the quality of the drain water of the heat supply heater 01 is higher, the condensate device 5 is cooled by the drain water which is cooled for the second time, which is beneficial to reducing the corrosion of the condensate device 5.
As a preferable implementation manner of the above embodiment, a secondary bypass is further connected in parallel between the hot-side inlet and the hot-side outlet of the secondary heat exchanger 4, a second shut-off valve 42 is disposed at both the hot-side inlet and the hot-side outlet of the secondary heat exchanger 4, and a second bypass valve 41 is disposed at the secondary bypass. The secondary bypass, the second bypass valve 41 and the second shut-off valve 42 are used for facilitating maintenance of the secondary heat exchanger 4 without stopping the machine, and the drained water of the heat supply heater 01 cooled by the primary heat exchanger 3 can be directly discharged to the condenser 5 through the secondary bypass when the air cooling island operates in winter, so that the anti-freezing problem of the air cooling island can be effectively solved, and the safe operation of the air cooling island is ensured.
According to the drainage heat utilization system of the heat supply network heater, the drainage of the heat supply heater 01 and the heating return water of the heating module in the plant area are introduced into the primary heat exchanger 3, the drainage of the high-temperature heat supply heater 01 is utilized to heat the low-temperature heating return water, the water inlet temperature of the heating heater 9 is increased, the heating steam consumption of the heating heater 9 is reduced, and the economical efficiency of unit operation is improved.
Taking the Huaneng thermal power plant as an example, the heating temperature of the plant area is generally between 70 ℃ and 75 ℃, the flow rate is about 300T, and the pressure is about 0.4 MPa. The water drainage temperature of a heat supply heater 01 of a newly-built heat supply network is between 80 and 85 ℃, the flow is about 360T, the pressure is between 0.2 and 0.4MPa, and the pressure of the heat supply heater and the pressure is similar, so that the process requirement on a first-stage heat exchanger 3 is reduced, and the long-time safe and reliable operation can be ensured.
Through the transformation, the steam side (hot side) of the heating heater 9 in the plant area of the blue thermal power plant can be stopped or reduced, and the steam is saved by 5-10T per hour. The steam per ton is calculated according to 200 yuan, 1000-2000 yuan can be saved in each hour, 2.4-4.8 ten thousand yuan can be saved in one day, the heating period is 5 months, and 360-720 ten thousand yuan can be saved.
If the open circulating water is adopted to directly cool the heat supply heater 01 for drainage, the mode of operating one open water pump of two machines cannot be realized. Through the improvement, the drainage temperature is reduced, the open water pump can be operated to cool and drain water by two machines in winter, the open water pump consumes 400 degrees of electricity per hour, the service power is saved by 9600 degrees per day, the electricity can be saved by 86.4 ten thousand degrees in one heating season according to the calculation of 3 months of the open water pump in the outage, and the RMB is reduced to 43.2 ten thousand yuan.
After the project is implemented, the cooled heat supply heater 01 drains water to flow to the condenser 5 by means of the secondary bypass or the secondary heat exchanger 4, so that the flexibility and the safety of the air cooling island in winter freezing prevention are greatly improved, and the operation and maintenance cost is reduced.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The drainage heat utilization system of the heat supply network heating heater provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a hydrophobic heat utilization system of heat supply network heating heater which characterized in that, including the heating module of factory, be used for connecting the hydrophobic module of catchmenting of the hydrophobic export of heating heater and connect in hydrophobic module of catchmenting with one-level heat exchanger between the heating module of factory, with pass through one-level heat exchanger utilizes the hydrophobic heating of heating heater the heating return water of heating module of factory.
2. The system of claim 1, wherein the hydrophobic collection module comprises a hydrophobic collection tank and a hydrophobic pump connected between the hydrophobic collection tank and the hot side of the primary heat exchanger.
3. The system of claim 2, wherein the plant heating module comprises:
the heating water collecting tank is used for collecting heating backwater and is connected with the cold side of the primary heat exchanger in series;
the cold side of the heating heater is connected with the cold side of the primary heat exchanger in series, and the hot side of the heating heater is used for introducing heating steam to heat the cold side of the primary heat exchanger for drainage;
the heating water supply header is connected with a cold side outlet of the heating heater in series and used for supplying heating hot water to a pipe network of the plant area heating module;
and the heating circulating pump is connected between the primary heat exchanger and the heating heater.
4. The system for utilizing the hydrophobic heat of the heat supply network heating heater according to any one of claims 1 to 3, further comprising a secondary heat exchanger, wherein the hot side of the secondary heat exchanger is connected in series with the hot side of the primary heat exchanger, and the cold side of the secondary heat exchanger is used for introducing open circulating water.
5. The system for utilizing the hydrophobic heat of the heat supply network heating heater according to claim 3, wherein a cold side of the primary heat exchanger is connected in parallel with a primary bypass, the primary bypass is provided with a first bypass valve, an inlet and an outlet of the cold side of the primary heat exchanger are provided with first shut-off valves, and the primary bypass is connected with the heating water collection tank and the heating circulating pump.
6. The hydrophobic heat utilization system of the heat supply network heater according to claim 4, wherein a secondary bypass is connected in parallel with a hot side of the secondary heat exchanger, a second bypass valve is arranged on the secondary bypass, and a second shut-off valve is arranged at an inlet and an outlet of the hot side of the secondary heat exchanger.
7. The hydrophobic heat utilization system of a heat supply network heater according to claim 5, wherein the plant heating module further comprises a makeup tank connected to the heating heater.
8. The system for utilizing the hydrophobic heat of the heat supply network heater according to claim 7, wherein a temperature detection mechanism and a flow detection mechanism are arranged between the hydrophobic water collection tank and the primary heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121783318.3U CN215412076U (en) | 2021-08-02 | 2021-08-02 | Drainage heat utilization system of heat supply network heat supply heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121783318.3U CN215412076U (en) | 2021-08-02 | 2021-08-02 | Drainage heat utilization system of heat supply network heat supply heater |
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| CN215412076U true CN215412076U (en) | 2022-01-04 |
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| CN202121783318.3U Active CN215412076U (en) | 2021-08-02 | 2021-08-02 | Drainage heat utilization system of heat supply network heat supply heater |
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2021
- 2021-08-02 CN CN202121783318.3U patent/CN215412076U/en active Active
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