CN217107148U - A hydrophobic cooling system of heat supply network that is used for supercritical unit to cut off heat supply of low pressure jar - Google Patents

Abstract

The utility model discloses a hydrophobic cooling system of heat supply network for supplying heat of supercritical unit excision low pressure jar, including condensate pump, smart processing system, intermediate pressure jar, low pressure jar, condenser, a hydrophobic cooler, heat supply network head station heat supply network heater, No. two hydrophobic coolers, when steam turbine excision low pressure jar moves, the hydrophobic process of heat supply network gets into smart processing system after No. two hydrophobic coolers cools down. The utility model ensures that the drainage temperature of the heat supply network meets the fine processing requirement when the supercritical combined heat and power generation unit cuts off the operation condition of the low pressure cylinder, further ensures the water supply quality of the boiler, and ensures the supercritical unit to operate safely and stably for a long time; on the other hand, the system not only meets the cooling requirement of heat supply network drainage when the supercritical unit cylinder is cut, but also provides two cooling sources for the cooling of the heat supply network drainage when the unit is pumped and condensed, and improves the reliability of the cooling system.

Description

A hydrophobic cooling system of heat supply network that is used for supercritical unit to cut off heat supply of low pressure jar

Technical Field

The utility model relates to a hydrophobic cooling system of heat supply network of heat supply unit, especially a hydrophobic cooling system of heat supply network of supercritical combined heat and power generation unit.

Background

In order to absorb new energy such as wind power and the like, more and more fire power units are flexibly transformed; a steam turbine in a thermal power generating unit flexibility transformation project is generally subjected to low-pressure cylinder cutting transformation.

Compared with a subcritical cogeneration unit, the heat supply network of the supercritical cogeneration unit needs to be cooled (a cold source adopts condensed water) when the temperature is reduced to below 60 ℃ so as to enter a fine treatment system, otherwise, a filter element in the fine treatment system is damaged. In order to meet the requirement of flexible operation of a thermal power generating unit, more and more turbines are modified by cutting off low-pressure cylinders. When the supercritical unit operates under the working condition of cutting off the low-pressure cylinder, the exhaust steam from the low-pressure cylinder to the condenser is greatly reduced, so that the condensate flow is greatly reduced; as a heat supply network drainage cold source, the reduction of condensed water inevitably causes the drainage temperature of the heat supply network not to meet the cooling requirement; how to solve the problem of insufficient drainage and cooling of a heat supply network for the cylinder cutting operation of a supercritical cogeneration unit and meet the temperature requirement of finely treated inlet water is urgent.

The utility model discloses mainly cut jar operation heat supply network hydrophobic cooling not enough problem to supercritical combined heat and power generation unit and innovate, created a heat supply network hydrophobic cooling system who is used for supercritical combined heat and power generation unit to amputate low pressure jar heat supply.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a reasonable in design, operation are nimble, and the dependable performance for the hydrophobic cooling system of heat supply network of supercritical unit excision low pressure jar heat supply. The system not only meets the cooling requirement of heat supply network drainage when the supercritical unit cylinder is cut, but also provides two cooling sources for the cooling of the heat supply network drainage when the extraction and condensation unit operates, and improves the reliability of the cooling system.

The utility model provides a technical scheme that above-mentioned problem adopted is: a heat supply network drainage cooling system for supplying heat for a low-pressure cylinder of a supercritical unit is characterized by comprising a medium-pressure cylinder, the low-pressure cylinder, a condenser, a first drainage cooler, a heat supply network heater at a first station of the heat supply network and a second drainage cooler, wherein a steam outlet of the medium-pressure cylinder is connected with a steam exhaust pipeline and a medium-pressure steam exhaust pipeline of the medium-pressure cylinder; the steam inlet and the steam outlet of the low pressure cylinder are respectively connected with a steam inlet pipeline and a steam exhaust pipeline of the low pressure cylinder, and the steam inlet pipeline of the low pressure cylinder is connected with a steam exhaust pipeline of the medium pressure cylinder; the steam inlet, the drain port, the heat supply network circulating water inlet and the heat supply network circulating water outlet of the heat supply network heater at the first station of the heat supply network are respectively connected with a heater steam inlet pipeline, a heater drain pipeline, a heat supply network circulating water return pipeline and a heat supply network circulating water supply pipeline, a No. nine valve is arranged on the heat supply network circulating water return pipeline, the heater steam inlet pipeline is connected with a middle exhaust steam extraction pipeline, and the heater drain pipeline is connected with a No. two drain cooler high-temperature side water inlet pipeline; the high-temperature side water inlet, the high-temperature side water outlet, the low-temperature side water inlet and the low-temperature side water outlet of the second hydrophobic cooler are respectively connected with a high-temperature side water inlet pipeline of the second hydrophobic cooler, a high-temperature side water outlet pipeline of the second hydrophobic cooler, a low-temperature side water inlet pipeline of the second hydrophobic cooler and a low-temperature side water outlet pipeline of the second hydrophobic cooler, a third valve is installed on the high-temperature side water inlet pipeline of the second hydrophobic cooler, a seventh valve is installed on the high-temperature side water outlet pipeline of the second hydrophobic cooler, a sixth valve is installed on the low-temperature side water inlet pipeline of the second hydrophobic cooler, and a fifth valve is installed on the low-temperature side water outlet pipeline of the second hydrophobic cooler; the high-temperature side water inlet, the high-temperature side water outlet, the low-temperature side water inlet and the low-temperature side water outlet of the first drain cooler are respectively connected with a high-temperature side water inlet pipeline of the first drain cooler, a high-temperature side water outlet pipeline of the first drain cooler, a low-temperature side water inlet pipeline of the first drain cooler and a low-temperature side water outlet pipeline of the first drain cooler, and a fourth valve and an eighth valve are respectively arranged on the high-temperature side water inlet pipeline of the first drain cooler and the high-temperature side water outlet pipeline of the first drain cooler; the inlet of the condenser is connected with a steam exhaust pipeline and a water outlet pipeline at the high-temperature side of the first drainage cooler, and the outlet of the condenser is connected with a condensed water pipeline; the condensed water pipeline is connected with a condensed water pump and is connected with a low-temperature side water inlet pipeline of the first hydrophobic cooler; the first drainage cooler low-temperature side water outlet pipeline is connected with a second drainage cooler drainage pipeline, the second drainage cooler drainage pipeline is connected with a second drainage cooler high-temperature side water outlet pipeline, and a drainage pump is connected to the second drainage cooler drainage pipeline; the high-temperature side water inlet pipeline of the first drainage cooler is connected with the drainage pipeline of the heater; no. two hydrophobic cooler low temperature side outlet pipe says and No. two hydrophobic cooler low temperature side inlet pipe says all is connected with heat supply network circulating water return pipe, and No. two hydrophobic cooler low temperature side outlet pipe says and No. two hydrophobic cooler low temperature side inlet pipe says and connects the both sides at No. nine valves.

Further, the low-temperature side water outlet pipeline of the first drainage cooler is connected to an inlet of a fine processing system.

The operation method comprises the following steps:

when the low-pressure cylinder of the steam turbine is cut off, fully closing the first valve, the fourth valve, the eighth valve, the ninth valve, and fully opening the second valve, the third valve, the fifth valve, the sixth valve and the seventh valve; the heat supply network drainage flowing out of the heat supply network initial station heat supply network heater enters the condenser after being cooled by the second drainage cooler, so that the temperature of condensation water in the condensation water pipeline is reduced, and the temperature of condensation water in the water outlet pipeline at the low temperature side of the first drainage cooler meets the requirement of the water inlet temperature of the fine treatment system.

When the steam turbine is in pumping and condensing operation, fully closing a third valve, a fifth valve, a sixth valve, a seventh valve, fully opening a first valve, a second valve, a fourth valve, an eighth valve and a ninth valve; the return water of the circulating water of the heat supply network is firstly subjected to primary heating through a second drainage cooler and then subjected to secondary heating through a heat supply network heater at the first station of the heat supply network, so that heat energy is recovered, and energy is saved.

Compared with the prior art, the utility model, have following advantage and effect: (1) the problem of insufficient drainage and cooling of a heat supply network during cylinder cutting operation of a supercritical cogeneration unit is solved, and the temperature requirement of finely treated inlet water is met; (2) when the supercritical combined heat and power generation unit is in extraction condensing operation, the heat supply network drainage cooling system has multiple cooling modes, so that the reliability is enhanced; (3) and the circulating water of the heat supply network is returned to cool the heat supply network of the supercritical cogeneration unit to drain water, so that low-grade heat energy is recovered.

Drawings

Fig. 1 is a schematic diagram of the system structure of the present invention.

In the figure: condensate pump 1, fine processing system 2, intermediate pressure cylinder 3, low pressure cylinder 4, condenser 5, first drain cooler 6, drain pump 7, heat supply network first station heat supply network heater 9, second drain cooler 10, first valve 61, second valve 62, third valve 63, fourth valve 64, fifth valve 65, sixth valve 66, seventh valve 67, eighth valve 68, ninth valve 69, low pressure cylinder steam inlet pipe 601, intermediate pressure cylinder steam exhaust pipe 602, intermediate steam exhaust pipe 603, heater steam inlet pipe 604, heater steam drain pipe 605, second drain cooler high temperature water inlet pipe 606, first drain cooler high temperature water inlet pipe 607, second drain cooler low temperature side water outlet pipe 608, second drain cooler low temperature side water inlet 609, second drain cooler high temperature side water outlet pipe 610, second drain cooler water drain pipe 611, first drain cooler low temperature side water outlet pipe 612, second drain cooler water outlet pipe 612, A first hydrophobic cooler low-temperature side water inlet pipeline 613, a condensed water pipeline 614, a first hydrophobic cooler high-temperature side water outlet pipeline 615, a steam exhaust pipeline 616, a heat supply network circulating water supply pipeline 617 and a heat supply network circulating water return pipeline 618.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1, in this embodiment, a heat supply network drainage cooling system for supplying heat to a low-pressure cylinder of a supercritical unit includes an intermediate-pressure cylinder 3, a low-pressure cylinder 4, a condenser 5, a first drainage cooler 6, a heat supply network first-station heat supply network heater 9, and a second drainage cooler 10, wherein a steam exhaust port of the intermediate-pressure cylinder 3 is connected with a steam exhaust pipeline 602 and an intermediate-pressure cylinder steam exhaust pipeline 603, the steam exhaust pipeline 602 of the intermediate-pressure cylinder is provided with a first valve 61, and the steam exhaust pipeline 603 is provided with a second valve 62; the steam inlet and the steam outlet of the low pressure cylinder 4 are respectively connected with a steam inlet pipeline 601 and a steam exhaust pipeline 616 of the low pressure cylinder, and the steam inlet pipeline 601 of the low pressure cylinder is connected with a steam exhaust pipeline 602 of the intermediate pressure cylinder; a steam inlet, a drain outlet, a heat supply network circulating water inlet and a heat supply network circulating water outlet of a heat supply network first station heat supply network heater 9 are respectively connected with a heater steam inlet pipeline 604, a heater drain pipeline 605, a heat supply network circulating water return pipeline 618 and a heat supply network circulating water supply pipeline 617, a No. nine valve 69 is arranged on the heat supply network circulating water return pipeline 618, the heater steam inlet pipeline 604 is connected with a middle exhaust steam extraction pipeline 603, and the heater drain pipeline 605 is connected with a No. two drain cooler high-temperature side water inlet pipeline 606; the high-temperature side water inlet, the high-temperature side water outlet, the low-temperature side water inlet and the low-temperature side water outlet of the second hydrophobic cooler 10 are respectively connected with a second hydrophobic cooler high-temperature side water inlet pipeline 606, a second hydrophobic cooler high-temperature side water outlet pipeline 610, a second hydrophobic cooler low-temperature side water inlet pipeline 609 and a second hydrophobic cooler low-temperature side water outlet pipeline 608, a third valve 63 is installed on the second hydrophobic cooler high-temperature side water inlet pipeline 606, a seventh valve 67 is installed on the second hydrophobic cooler high-temperature side water outlet pipeline 610, a sixth valve 66 is installed on the second hydrophobic cooler low-temperature side water inlet pipeline 609, and a fifth valve 65 is installed on the second hydrophobic cooler low-temperature side water outlet pipeline 608; the high-temperature side water inlet, the high-temperature side water outlet, the low-temperature side water inlet and the low-temperature side water outlet of the first drain cooler 6 are respectively connected with a first drain cooler high-temperature side water inlet pipeline 607, a first drain cooler high-temperature side water outlet pipeline 615, a first drain cooler low-temperature side water inlet pipeline 613 and a first drain cooler low-temperature side water outlet pipeline 612, and a fourth valve 64 and an eighth valve 68 are respectively installed on the first drain cooler high-temperature side water inlet pipeline 607 and the first drain cooler high-temperature side water outlet pipeline 615; an inlet of the condenser 5 is connected with a steam exhaust pipeline 616 and a first drainage cooler high-temperature side water outlet pipeline 615, and an outlet of the condenser 5 is connected with a condensed water pipeline 614; the condensate water pipe 614 is connected with a condensate water pump 1, and the condensate water pipe 614 is connected with a first drain cooler low-temperature side water inlet pipe 613; the first drainage cooler low-temperature side water outlet pipe 612 is connected to the inlet of the fine processing system 2; the first drain cooler low-temperature side water outlet pipeline 612 is connected with a second drain cooler drain pipeline 611, the second drain cooler drain pipeline 611 is connected with a second drain cooler high-temperature side water outlet pipeline 610, and a drain pump 7 is connected to the second drain cooler drain pipeline 611; the first drain cooler high-temperature side water inlet pipe 607 is connected with the heater drain pipe 605; no. two hydrophobic cooler low temperature side outlet pipe lines 608 and No. two hydrophobic cooler low temperature side inlet pipe lines 609 are both connected with heat supply network circulating water return pipe 618, and No. two hydrophobic cooler low temperature side outlet pipe lines 608 and No. two hydrophobic cooler low temperature side inlet pipe lines 609 are connected on both sides of No. nine valves 69.

The operation method comprises the following steps:

when the steam turbine cuts off the operation of the low pressure cylinder 4, the first valve 61, the fourth valve 64, the eighth valve 68 and the ninth valve 69 are fully closed, and the second valve 62, the third valve 63, the fifth valve 65, the sixth valve 66 and the seventh valve 67 are fully opened; the drain water of the heat supply network flowing out of the heat supply network first station heater 9 is cooled by the second drain cooler 10 and then enters the condenser 5, so that the temperature of the condensed water in the condensed water pipeline 614 is reduced, and the temperature of the condensed water in the low-temperature side water outlet pipeline 612 of the first drain cooler meets the requirement of the water inlet temperature of the fine processing system 2.

When the steam turbine is in pumping and condensing operation, fully closing a third valve 63, a fifth valve 65, a sixth valve 66 and a seventh valve 67, and fully opening a first valve 61, a second valve 62, a fourth valve 64, an eighth valve 68 and a ninth valve 69; the return water of the circulating water of the heat supply network is firstly subjected to primary heating through the second drainage cooler 10 and then subjected to secondary heating through the heat supply network heater 9 at the first station of the heat supply network, so that heat energy is recovered, and energy is saved.

When the steam turbine is in pumping and condensing operation, the ninth valve 69 is fully closed, the first valve 61, the second valve 62, the third valve 63, the fourth valve 64, the fifth valve 65, the sixth valve 66, the seventh valve 67 and the eighth valve 68 are fully opened, the heat supply network drainage can be cooled through the first drainage cooler 6 and the second drainage cooler 10, and the reliability of the cooling system is enhanced.

Those not described in detail in this specification are well within the skill of the art.

In addition, it should be noted that the above contents described in the present specification are only illustrations of the structure of the present invention. All equivalent changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions by those skilled in the art may be made to the described embodiments without departing from the scope of the invention as defined in the accompanying claims.

Claims (2)

1. A heat supply network drainage cooling system for supplying heat for a supercritical unit to cut off a low-pressure cylinder is characterized by comprising a medium-pressure cylinder (3), the low-pressure cylinder (4), a condenser (5), a first drainage cooler (6), a heat supply network head station heat supply network heater (9) and a second drainage cooler (10), wherein a steam outlet of the medium-pressure cylinder (3) is connected with a steam exhaust pipeline (602) of the medium-pressure cylinder and a medium-exhaust steam extraction pipeline (603), a first valve (61) is installed on the steam exhaust pipeline (602) of the medium-pressure cylinder, and a second valve (62) is installed on the medium-exhaust steam extraction pipeline (603); the steam inlet and the steam outlet of the low pressure cylinder (4) are respectively connected with a steam inlet pipeline (601) of the low pressure cylinder and a steam exhaust pipeline (616), and the steam inlet pipeline (601) of the low pressure cylinder is connected with a steam exhaust pipeline (602) of the medium pressure cylinder; the steam inlet, the drain outlet, the heat supply network circulating water inlet and the heat supply network circulating water outlet of the heat supply network initial station heat supply network heater (9) are respectively connected with a heater steam inlet pipeline (604), a heater drain pipeline (605), a heat supply network circulating water return pipeline (618) and a heat supply network circulating water supply pipeline (617), a nine-number valve (69) is installed on the heat supply network circulating water return pipeline (618), the heater steam inlet pipeline (604) is connected with a middle exhaust steam extraction pipeline (603), and the heater drain pipeline (605) is connected with a second drain cooler high-temperature side water inlet pipeline (606); the high-temperature side water inlet, the high-temperature side water outlet, the low-temperature side water inlet and the low-temperature side water outlet of the second hydrophobic cooler (10) are respectively connected with a second hydrophobic cooler high-temperature side water inlet pipeline (606), a second hydrophobic cooler high-temperature side water outlet pipeline (610), a second hydrophobic cooler low-temperature side water inlet pipeline (609) and a second hydrophobic cooler low-temperature side water outlet pipeline (608), a third valve (63) is installed on the second hydrophobic cooler high-temperature side water inlet pipeline (606), a seventh valve (67) is installed on the second hydrophobic cooler high-temperature side water outlet pipeline (610), a sixth valve (66) is installed on the second hydrophobic cooler low-temperature side water inlet pipeline (609), and a fifth valve (65) is installed on the second hydrophobic cooler low-temperature side water outlet pipeline (608); the high-temperature side water inlet, the high-temperature side water outlet, the low-temperature side water inlet and the low-temperature side water outlet of the first hydrophobic cooler (6) are respectively connected with a high-temperature side water inlet pipeline (607) of the first hydrophobic cooler, a high-temperature side water outlet pipeline (615) of the first hydrophobic cooler, a low-temperature side water inlet pipeline (613) of the first hydrophobic cooler and a low-temperature side water outlet pipeline (612) of the first hydrophobic cooler, and a fourth valve (64) and an eighth valve (68) are respectively installed on the high-temperature side water inlet pipeline (607) of the first hydrophobic cooler and the high-temperature side water outlet pipeline (615) of the first hydrophobic cooler; the inlet of the condenser (5) is connected with a steam exhaust pipeline (616) and a water outlet pipeline (615) at the high-temperature side of the first drainage cooler, and the outlet of the condenser (5) is connected with a condensed water pipeline (614); the condensed water pipeline (614) is connected with a condensed water pump (1), and the condensed water pipeline (614) is connected with a first drain cooler low-temperature side water inlet pipeline (613); the first drainage cooler low-temperature side water outlet pipeline (612) is connected with a second drainage cooler drainage pipeline (611), the second drainage cooler drainage pipeline (611) is connected with the second drainage cooler high-temperature side water outlet pipeline (610), and a drainage pump (7) is connected to the second drainage cooler drainage pipeline (611); the first drain cooler high-temperature side water inlet pipeline (607) is connected with a heater drain pipeline (605); and the water outlet pipeline (608) at the low-temperature side of the second hydrophobic cooler and the water inlet pipeline (609) at the low-temperature side of the second hydrophobic cooler are both connected with the circulating water return pipeline (618) of the heat supply network, and the water outlet pipeline (608) at the low-temperature side of the second hydrophobic cooler and the water inlet pipeline (609) at the two sides of the ninth valve (69).

2. The heat supply network hydrophobic cooling system for supercritical unit cutting low pressure cylinder heating according to claim 1 is characterized in that the first hydrophobic cooler low temperature side water outlet pipeline (612) is connected to the inlet of the fine processing system (2).

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