CN213955399U - Raw water heating system of thermal power plant - Google Patents
Raw water heating system of thermal power plant Download PDFInfo
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- CN213955399U CN213955399U CN202022752088.6U CN202022752088U CN213955399U CN 213955399 U CN213955399 U CN 213955399U CN 202022752088 U CN202022752088 U CN 202022752088U CN 213955399 U CN213955399 U CN 213955399U
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Abstract
The utility model relates to a demineralized water preparation system of power plant and waste heat utilization technical field disclose a thermal power plant raw water heating system, including raw water pipeline and heat supply network circulating water return pipe, still include raw water heater, raw water heater's cold side and hot side pass through the pipeline and link to each other with raw water pipeline and heat supply network circulating water return pipe respectively, are equipped with heat supply network water booster pump on the fourth pipeline, are equipped with circulating water flow control valve group on the third pipeline, and raw water pipeline is equipped with first temperature measurement point in the upper reaches that is located pipeline raw water export, is equipped with the second temperature measurement point in the low reaches that is located pipeline raw water import. The utility model discloses the raw water heating system of steam power plant uses the heat supply network circulating water return heating raw water of low-grade, guarantees under raw water leaving water temperature's the prerequisite, realizes the step utilization of the energy, has avoided the conventional high-grade steam heating that uses, can improve the hot economic nature of unit, not only environmental protection but also energy-conservation.
Description
Technical Field
The utility model relates to a demineralized water preparation system of power plant and waste heat utilization technical field, concretely relates to raw water heating system of steam power plant.
Background
The operation of a thermal power plant is usually accompanied with certain steam-water working medium loss, particularly, part of units with large heat supply load have the water supplement amount of hundreds of tons per hour, a demineralized water preparation workshop matched with the water supplement capacity is usually built in the thermal power plant, and raw water of the power plant is subjected to a multi-step treatment procedure to generate qualified demineralized water. At present, along with the reduction of the quality of raw water and the increase of water supplement amount, most of power plant demineralized water preparation systems adopt a membrane method for ion removal, but the membrane method treatment process has strict requirements on the temperature of inlet raw water, has a proper working temperature range (generally 20 +/-5 ℃) and is lower than a proper lower limit (15 ℃) of the temperature range, the water yield of system effluent cannot be guaranteed, the insufficient water supplement amount of a thermodynamic system forces the system to reduce the operation load, the output and the heat supply capacity of a unit of the system are influenced, and the safe operation of the system is seriously threatened.
Therefore, in order to meet the requirements of a demineralized water preparation system, a raw water heater is generally required to heat raw water to a certain temperature (generally designed according to 25 ℃) in a season in which the water supplement temperature is low. The current mainstream raw water heating mode is that auxiliary steam of a thermodynamic system is adopted to heat raw water, the parameter of the auxiliary steam is generally about 1.0MPa/300 ℃, the raw water heater has a mixed type and a surface type, the surface type raw water heater is used more, and condensed water for heating steam can be directly recycled to a fresh water tank of a desalted water preparation workshop.
However, in the conventional raw water heating system, because the heating medium is steam, the grade of a pipeline and a valve at the high-temperature side in the system needs to be selected at a higher grade, heat preservation needs to be additionally performed, part of valves need to be adjusted or import equipment needs to be used, and a general steam pipeline for raw water heating is led out from a steam turbine room and then is connected to a demineralized water preparation workshop, so that the path is longer, and the investment of a factory pipe frame is invisibly increased. In addition, the steam pipeline also has certain potential safety hazard for operators in a demineralized water preparation workshop.
In addition, on the principle of energy cascade utilization, the use of auxiliary steam for heating raw water is not economical, the heat exchange temperature difference is as high as more than 250 ℃, the difference of the energy grade of media on the cold side and the hot side of a raw water heater is huge, and the heat exchange brings great irreversible loss.
A heat supply network circulating water system of a thermal power plant generally belongs to a primary heat supply network system, the temperature of the water supplied by the heat supply network circulating water is generally about 110-130 ℃, the water supplied by the heat supply network circulating water is sent out of a factory to exchange heat with a secondary heat supply network system of a thermal power station, and the returned water of the heat supply network circulating water after the temperature is reduced returns to the thermal power plant to be heated again. The running temperature of the circulating backwater of the heat supply network is generally 60-70 ℃.
Disclosure of Invention
The utility model aims at providing a thermal power plant raw water heating system to above-mentioned not enough of technique, use the heat supply network circulating water return heating raw water of low-grade, guarantee under the prerequisite of raw water leaving water temperature, realize the step utilization of the energy, avoided the high-grade steam heating of conventional use, can improve the heat economy nature of unit, not only environmental protection but also energy-conservation.
In order to achieve the above purpose, the raw water heating system of the thermal power plant comprises a raw water pipeline, a heat supply network circulating water return pipeline and a raw water heater, wherein the raw water heater is a surface heat exchanger for water heat exchange, a heater raw water inlet and a heater raw water outlet are arranged on a cold side of the raw water heater, a heater heat supply network circulating water inlet and a heater heat supply network circulating water outlet are arranged on a hot side of the raw water heater, a pipeline raw water outlet and a pipeline raw water inlet are sequentially arranged on the raw water pipeline along a water flow direction, a pipeline circulating water outlet and a pipeline circulating water inlet are sequentially arranged on the heat supply network circulating water return pipeline along the water flow direction, the pipeline raw water outlet is communicated with the heater raw water inlet through a first pipeline, the pipeline raw water inlet is communicated with the heater raw water outlet through a second pipeline, the pipeline circulating water outlet is communicated with the heater heat supply network circulating water inlet through a third pipeline, the pipeline circulating water inlet is communicated with the heater heat supply network circulating water outlet through a fourth pipeline, a heat supply network water booster pump is arranged on the fourth pipeline, a circulating water flow regulating valve group is arranged on the third pipeline, a first temperature measuring point is arranged at the upstream of the pipeline raw water outlet of the raw water pipeline, and a second temperature measuring point is arranged at the downstream of the pipeline raw water inlet.
Preferably, the circulating water flow regulating valve group comprises a first shutoff valve and a heat supply network circulating water pressure regulating valve which are sequentially arranged on the third pipeline along the water flow direction.
Preferably, a second shutoff valve is arranged on the first pipeline, a third shutoff valve is arranged on the second pipeline, and a fourth shutoff valve is arranged at a position between the pipeline raw water outlet and the pipeline raw water inlet on the raw water pipeline.
Preferably, the first, second, third and fourth shut-off valves may be of the manual or electric type.
Preferably, a first pressure measuring point is arranged on the heat supply network circulating water return pipeline, and a second pressure measuring point is arranged at an outlet of the heater heat supply network circulating water outlet.
Compared with the prior art, the utility model, have following advantage:
1. auxiliary steam is not used for heating the raw water, so that the saved auxiliary steam can continue to expand to work in a steam turbine, and the heat efficiency of the unit is improved;
2. the heat of the circulating water backwater of the low-grade heat supply network is effectively utilized, and the heat supply economy is good;
3. the heat exchange temperature difference of the raw water heater is greatly reduced, the irreversible loss is reduced, and the principle of energy cascade utilization is met;
4. the temperature and the pressure grade of the hot side of the raw water heating system are reduced, the raw water heating system does not relate to a pressure pipeline any more, and the safety of the system operation is greatly improved;
5. the whole investment of the raw water heating system is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the raw water heating system of the thermal power plant of the present invention.
The components in the figures are numbered as follows:
the system comprises a raw water pipeline 1, a heat supply network circulating water return pipeline 2, a raw water heater 3, a heater raw water inlet 4, a heater raw water outlet 5, a heater heat supply network circulating water inlet 6, a heater heat supply network circulating water outlet 7, a pipeline raw water outlet 8, a pipeline raw water inlet 9, a pipeline circulating water outlet 10, a pipeline circulating water inlet 11, a first pipeline 12, a second pipeline 13, a third pipeline 14, a fourth pipeline 15, a heat supply network water booster pump 16, a circulating water flow regulating valve group 17, a first temperature measuring point 18, a second temperature measuring point 19, a first shut-off valve 20, a heat supply network circulating water pressure regulating valve 21, a second shut-off valve 22, a third shut-off valve 23, a fourth shut-off valve 24, a first pressure measuring point 25 and a second pressure measuring point 26.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
As shown in figure 1, the utility model relates to a raw water heating system of a thermal power plant, which comprises a raw water pipeline 1, a heat supply network circulating water return pipeline 2 and a raw water heater 3, wherein the raw water heater 3 is a surface heat exchanger for water heat exchange, the cold side of the raw water heater is provided with a heater raw water inlet 4 and a heater raw water outlet 5, the hot side of the raw water heater is provided with a heater heat supply network circulating water inlet 6 and a heater heat supply network circulating water outlet 7, the raw water pipeline 1 is sequentially provided with a pipeline raw water outlet 8 and a pipeline raw water inlet 9 along the water flow direction, the heat supply network circulating water return pipeline 2 is sequentially provided with a pipeline circulating water outlet 10 and a pipeline circulating water inlet 11 along the water flow direction, the pipeline raw water outlet 8 is communicated with the heater raw water inlet 4 through a first pipeline 12, the pipeline raw water inlet 9 is communicated with the heater raw water outlet 5 through a second pipeline 13, the pipeline circulating water outlet 10 is communicated with the heater heat supply network circulating water inlet 6 through a third pipeline 14, the pipeline circulating water inlet 11 is communicated with the heater heat supply network circulating water outlet 7 through a fourth pipeline 15, a heat supply network water booster pump 16 is arranged on the fourth pipeline 15, a circulating water flow regulating valve group 17 is arranged on the third pipeline 14, a first temperature measuring point 18 is arranged on the upstream of the pipeline raw water outlet 8 of the raw water pipeline 1, and a second temperature measuring point 19 is arranged on the downstream of the pipeline raw water inlet 9.
The circulating water flow control valve group 17 comprises a first shut-off valve 20 and a heat supply network circulating water pressure control valve 21 which are sequentially arranged on a third pipeline 14 along the water flow direction, a second shut-off valve 22 is arranged on the first pipeline 12, a third shut-off valve 23 is arranged on the second pipeline 13, a fourth shut-off valve 24 is arranged on the raw water pipeline 1 between the raw water pipeline outlet 8 and the raw water pipeline inlet 9, and in addition, the first shut-off valve 20, the second shut-off valve 22, the third shut-off valve 23 and the fourth shut-off valve 24 can be of a manual or electric type.
In this embodiment, a first pressure measuring point 25 is disposed on the heat supply network circulating water return pipe 2, and a second pressure measuring point 26 is disposed at an outlet of the heater heat supply network circulating water outlet 7.
When the device is used in the embodiment, when the temperature measured by the first temperature measuring point 18 is lower than a set value, the raw water heating system is put into operation; closing the fourth shut-off valve 24, and opening the second shut-off valve 22 and the third shut-off valve 23; opening a first shut-off valve 20 in the circulating water flow regulating valve group 17, and interlocking to open a heat supply network circulating water pressure regulating valve 21; heat exchange between cold side medium raw water and hot side medium heat supply network circulating water return water is carried out in the raw water heater 3, the raw water leaves the raw water heater 3 after being heated and returns to the raw water pipeline 1, and the heat supply network circulating water return water is sent back to the heat supply network circulating water return pipeline 2 after being boosted by the heat supply network water booster pump 16.
In addition, in order to ensure that the temperature measured by the second temperature measuring point 19 meets the requirements of subsequent treatment, the opening of the heat supply network circulating water pressure regulating valve 21 is interlocked, and the good flow of the heater heat supply network circulating water inlet is controlled.
Meanwhile, the measured value measured by the first pressure measuring point 25 is compared with the measured value measured by the second pressure measuring point 26, and the lift of the heat supply network water booster pump 16 is determined after the resistance loss of the subsequent pipeline is combined, so that the return of the heat supply network circulating water return water to the heat supply network circulating water return pipeline 2 is ensured.
The following 350MW heat supply unit that takes one set of single unit moisturizing volume to be 300t/h as an example calculates and adopts the utility model discloses a raw water heating system to the investment of unit and the influence of heat economic nature.
The operating parameters of the raw water heating system of the conventional scheme are shown in table 1:
table 1 conventional protocol raw water heating system operating parameters
Adopt the utility model discloses scheme raw water heating system operating parameter is shown as table 2:
TABLE 2 the utility model discloses scheme raw water heating system operating parameter
It is thus clear that, adopt the utility model discloses a raw water heating system, heating flow 300 t/h's raw water, the heat supply network circulating water return flow that consumes is 120t/h, and this part returns heat supply network circulating water for heating of raw water of heat supply network circulating water return pipe 2, need absorb heat again in the heat supply network heater in the heat supply network head station and supply out of the factory after the uniform temperature, and the heat supply network heater adopts the intermediate pressure jar exhaust steam heating heat supply network circulating water of steam turbine, and general steam parameter is 0.4MPa/250 ℃. Only the amount of steam consumed to raise the temperature of the part of the circulating water of the heat supply network from 20 ℃ to 70 ℃ is calculated. The calculations are shown in table 3:
TABLE 3 the utility model discloses the scheme is given water heating and is used heat supply network circulating water heating parameter table
As can be seen from Table 1, if auxiliary steam is used for heating raw water, the steam consumption is 8.85t/h, if the steam is not used for heating raw water, the steam can be expanded in the steam turbine to do work, the electric power is output by the motor, and the power generation power is calculated to be 1690 kW. If adopt the utility model discloses a raw water heating system, it does not need supplementary steam heating raw water, but need set up heat supply network water booster pump 16, its motor power is 7.5kW, in addition, because still need reheating after the heat supply network circulating water cooling for heat the raw water and just can supply the heat supply outside the factory, a steam that is used for heat supply network circulating water heating generally adopts steam turbine intermediate pressure cylinder steam extraction, through calculating, the steam flow that corresponds needs is 9.94t/h, according to the calculation mode the same with table 1, can calculate this part steam flow and continue the electric power of inflation output in the steam turbine, through calculating 1539 kW.
Use the utility model discloses a behind the raw water heating system, the multiplicable unit of system output is 1690kW-7.5kW-1539kW 143.5kW, according to 4 months of operation (2880h) time each year, and the price of power on the net is calculated for 0.4 yuan/kW.h, and 16.5 ten thousand yuan can be received and benefited more every year to every unit. The method has obvious economic benefit, and the larger the water supplement amount of the unit is, the larger the profit is.
The raw water heating system of the thermal power plant does not use auxiliary steam to heat raw water, the saved auxiliary steam can continue to expand and do work in the steam turbine, and the heat efficiency of the unit is improved; the heat of the circulating water backwater of the low-grade heat supply network is effectively utilized, and the heat supply economy is good; the heat exchange temperature difference of the raw water heater 3 is greatly reduced, the irreversible loss is reduced, and the principle of energy cascade utilization is met; the temperature and the pressure grade of the hot side of the raw water heating system are reduced, the raw water heating system does not relate to a pressure pipeline any more, and the safety of the system operation is greatly improved; the whole investment of the raw water heating system is reduced.
The foregoing shows and describes the general principles and principal structural features of the invention. The utility model discloses do not receive the restriction of above-mentioned example, not deviating from the utility model discloses under the prerequisite of spirit and scope, the utility model discloses still can have various changes and improvement, including adopting surface formula raw water heater, valve drive form to change, adopt the raw water of constant speed to heat with heat supply network circulating water booster pump etc. these changes and improvement all fall into the protection the utility model discloses an within range. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a steam power plant raw water heating system, includes former water pipeline (1) and heat supply network circulating water return water pipeline (2), its characterized in that: still include raw water heater (3), raw water heater (3) is the surface heat exchanger of water heat transfer, and its cold side is equipped with heater raw water import (4) and heater raw water export (5), and the hot side is equipped with heater heat supply network circulating water import (6) and heater heat supply network circulating water export (7), be equipped with pipeline raw water export (8) and pipeline raw water import (9) along the rivers direction in proper order on raw water pipeline (1), be equipped with pipeline circulating water export (10) and pipeline circulating water import (11) along the rivers direction in proper order on heat supply network circulating water return pipe (2), pipeline raw water export (8) through first pipeline (12) with heater raw water import (4) intercommunication, pipeline raw water import (9) through second raw water pipeline (13) with heater export (5) intercommunication, pipeline circulating water export (10) through third pipeline (14) with heater heat supply network circulating water import (6) link to each other The pipeline circulating water inlet (11) is communicated with the heater heat supply network circulating water outlet (7) through a fourth pipeline (15), a heat supply network water booster pump (16) is arranged on the fourth pipeline (15), a circulating water flow regulating valve group (17) is arranged on the third pipeline (14), a first temperature measuring point (18) is arranged on the upstream of the pipeline raw water outlet (8) of the raw water pipeline (1), and a second temperature measuring point (19) is arranged on the downstream of the pipeline raw water inlet (9).
2. The raw water heating system of a thermal power plant of claim 1, wherein: the circulating water flow regulating valve group (17) comprises a first shut-off valve (20) and a heat supply network circulating water pressure regulating valve (21) which are sequentially arranged on the third pipeline (14) along the water flow direction.
3. The raw water heating system of a thermal power plant of claim 2, wherein: be equipped with second shutoff valve (22) on first pipeline (12), be equipped with third shutoff valve (23) on second pipeline (13), be located on raw water pipeline (1) the position between pipeline raw water export (8) and pipeline raw water import (9) is equipped with fourth shutoff valve (24).
4. The raw water heating system of a thermal power plant of claim 3, wherein: the first shut-off valve (20), the second shut-off valve (22), the third shut-off valve (23) and the fourth shut-off valve (24) can be of a manual or electric type.
5. The raw water heating system of the thermal power plant of claim 4, wherein: and a first pressure measuring point (25) is arranged on the heat supply network circulating water return pipeline (2), and a second pressure measuring point (26) is arranged at the outlet of the heater heat supply network circulating water outlet (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022752088.6U CN213955399U (en) | 2020-11-24 | 2020-11-24 | Raw water heating system of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022752088.6U CN213955399U (en) | 2020-11-24 | 2020-11-24 | Raw water heating system of thermal power plant |
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| CN213955399U true CN213955399U (en) | 2021-08-13 |
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| CN202022752088.6U Active CN213955399U (en) | 2020-11-24 | 2020-11-24 | Raw water heating system of thermal power plant |
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