JP2018189074A - Power generator - Google Patents

Abstract

Disclosed is an apparatus for draining and storing steam discharged from the deaerator into the atmosphere and generating electric power using the potential energy of the stored drain to supplement the power in the station. A deaerator (1) heats condensate to a saturation temperature by using extracted steam from a turbine to remove dissolved gas from the condensate. At this time, the steam discharged from the deaerator to the discharge pipe 2 is caused to flow into the cooler 3. The drain generated by condensing the steam flowing into the cooler is stored in the drain storage tank 5. The drain generated in the discharge pipe passes through the drain drain pipe 7 and is stored in the drain water tank. The drain stored in the drain water tank is dropped toward the water turbine generator 6 installed at a lower position than the drain water tank, and electric power is generated using the change in potential energy. [Selection] Figure 1

Description

  The present invention relates to a power generation apparatus that supplements in-house electric power by draining atmospheric release steam from a deaerator and generating electric power by using a change in potential energy in a thermal power generation facility.

  In an apparatus that generates power by driving a micro-turbine in a conventional thermal power generation facility, a turbine is installed in the condenser cooling water drainage, discharge outlet, and condenser pipe, which is different from the deaerator atmospheric discharge system. In addition, the air released from the deaerator is not reused (for example, see Patent Documents 1 to 5).

JP-A-8-74514 JP 2002-317607 A JP 2005-256699 A JP 2008-223749 A JP 2003-97224 A

  In a conventional thermal power generation facility and a device having a micro power generation facility in a thermal power plant, the air released from the deaerator is directly released into the atmosphere and is not used for power generation.

  The present invention has been made to solve the above-described problems, and by installing a cooler, the steam released into the atmosphere is cooled and drained to store water, and the position of the stored drain An object of the present invention is to provide a device that supplements in-house power by generating power using energy.

The power generator according to this invention is
A degasser for degassing the dissolved gas contained in the condensate generated by the condenser that cools the steam exhausted by the turbine and returns it to the water;
A discharge pipe for discharging the dissolved gas and the vapor degassed by the deaerator to the outside of the deaerator;
A cooler connected to one outlet of the discharge pipe for cooling the dissolved gas and the vapor to condense the vapor;
A drain drain pipe connected to the other outlet of the discharge pipe and the outlet of the cooler, and draining the drain generated by the condensation of the vapor;
A storage tank for storing drainage drained through the drain drainpipe;
A storage tank drain pipe connected to the storage tank and draining the drain stored in the storage tank from the storage tank;
A turbine generator that has a drop with respect to the storage tank and is installed in the storage drain drain pipe, and generates electricity by rotating a turbine with the drain drained into the storage drain drain pipe;
It is equipped with.

  According to the present invention, while the thermal power plant is in operation, the deaerator always requires deaeration of the condensate, and the discharged steam is continuously released by a certain amount. Therefore, since the drain is continuously stored in the drain water tank, by using this, it is possible to generate power stably by the generator. Moreover, in this invention, since the apparatus structure which connects an air cooler and a drain pipe to a discharge pipe and installs a drain water tank and a water turbine generator through these is possible, installation of an apparatus is easy.

It is a figure which shows an example of the electric power generating apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the electric power generating apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the other example of the electric power generating apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows an example of the electric power generating apparatus which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG.
In FIG. 1, the power generation apparatus 100 according to the present embodiment supplies the extracted steam from the turbine through the extracted steam pipe 8 (to the deaerator 1) and supplies the condensate generated by the condenser to the condensate pipe 9. The degasser removes the dissolved gas contained in the steam and the condensate by heating it to the saturation temperature by the extracted steam supplied from the turbine. 1 and an air cooler 3 that takes in the dissolved gas and steam removed by the deaerator 1 and cools them with air (the arrow on the right side of the air cooler 3 in the figure indicates the air cooler 3 And the other outlet of the discharge pipe 2 to collect the drain produced by the cooling of the steam while flowing through the discharge pipe 2, and the steam in the air cooler 3 Collect the drain generated by cooling. A drain drain pipe 4 for draining water, a drain water tank 5 for storing drained drain via the drain drain pipe 4, and a drain connected to the drain water tank 5 and stored in the drain groove, for example, The drainage drain pipe 7 for draining and the turbine generator 6 installed below the storage drain drain pipe 7 with a difference in level from the drain storage tank 5 (with a drop) adjusts the potential energy of the drainage drain. It uses the change to generate electricity. As the turbine generator 6 used here, a micro turbine generator having an output of about several kW is assumed.

  As a result of estimation under the following conditions, it was found that the power generation amount of the water turbine generator 6 is expected to be about 5 kW. This power generation amount is an amount that can be sufficiently utilized for power supply for lighting and power supply for the rest room of the operator, and it is considered that the power generation device according to the present invention can be realized.

<Definition of calculation conditions and symbols>
Here, a thermal power plant equipped with a turbine is assumed to have an output of 600 MW class, and the following symbols are used for estimation, and the power generation amount is specifically estimated by assuming the following conditions. To do.
Qm: Steam discharge amount (calculated and calculated. The unit is kg / h),
K: Steam blowing coefficient (0.80),
C: coefficient depending on the nature of the vapor (1 MPa, 0.985 under the saturation temperature condition),
A: Piping area (assuming 125A piping and 12266 mm ² ),
P: pressure in the deaerator (assuming 1 MPa),
Qv: drain amount (calculated and calculated, unit is m ³ / h),
q: drain density (1000 kg / m ³ ),
L ₁ : loss in deaerator and discharge pipe (assumed to be 0.1),
L ₂ : Loss in the cooler (assumed to be 0.1),
W: power generation (estimated value, unit is kW),
H: Height difference between the drain water tank and the water turbine generator (50m),
η: power generation efficiency (assuming 0.8).

<Calculation result>
The steam blowing amount Qm released from the deaerator 1 is expressed as follows using the above symbols K, C, A, P, L ₁ and the values shown above from the steam blowing amount formula of JISB8226. It is obtained like this.
Qm = 5.25 KCA (P + 0.1) × (1−L ₁ ) ≈50 × 10 ³ (kg / h)
Further, the drain amount Qv stored in the drain water tank 5 is calculated by using the value of Qm, symbols q and L ₂ .
Qv = (Qm / q) × (1-L ₂ ) = 45 (m ³ / h)
Is calculated.

<Estimated power generation>
From the above, the power generation amount W in the water turbine generator 6 uses the value of Qv, the symbols H and η, and the values shown above.
W = 9.8 × H × Qv × η / 3600≈5 (kW)
Is required.

Next, the operation will be described.
In FIG. 1, the deaerator 1 removes dissolved gas from the condensate by heating the condensate to a saturation temperature by the extraction steam supplied from the turbine through the extraction steam pipe 8. At this time, the steam released from the deaerator 1 into the discharge pipe 2 is caused to flow into the air cooler 3. The steam that has flowed into the air cooler 3 condenses, and the generated drain is stored in the drain water tank 5 through the drain drain pipe 4. The drain generated in the discharge pipe 2 passes through the drain drain pipe 4 and is stored in the drain water tank 5. The drain stored in the drain reservoir 5 is dropped, and the turbine of the turbine generator 6 is rotated by utilizing the difference in the potential energy of the drain (using the height difference between the drain reservoir and the turbine generator). Let it generate electricity. In addition, water supply from the deaerator 1 to the boiler is performed by a water supply pipe 10. Further, the water storage drain is discharged to the outside through a drainage groove or the like. Arrows (excluding air) in the figure indicate main flow directions of the respective fluids flowing through the corresponding pipes (see FIG. 1).

Embodiment 2. FIG.
In the first embodiment, the case where power generation is performed using the vapor discharged from the deaerator 1 has been described.
In the second embodiment, as shown in FIG. 2, a discharge pipe valve 13, an atmospheric discharge pipe valve 12, and an atmospheric discharge pipe 11 are provided (in this example, both valves are two-way valves). By appropriately adjusting the opening and closing amounts of these valves according to the amount of power generated, the amount of steam released from the deaerator 1 is discharged to the atmosphere discharge pipe 11 side and the amount of flow to the air cooler 3 side The power generation device 200 that can adjust the drain generation amount and set the target power generation amount can be obtained. Also in this figure, the arrows (except air) in the figure indicate the main flow directions of the respective fluids flowing through the corresponding pipes as described above.

  As the power generation apparatus 200 according to the second embodiment, the example in which the discharge pipe valve 13 and the atmospheric discharge pipe valve 12 are used as the valves used to adjust the drain generation amount has been described above. As shown in FIG. 4, at least one of the drain drain pipe valve 14 provided in the drain drain pipe 4 or the storage drain drain pipe valve 15 provided in the storage drain drain pipe 7 is a three-way valve type valve. It is also possible to set the target power generation amount by adjusting the drain generation amount by adjusting the opening / closing amount of the corresponding valve using two valves. In this figure as well, the arrows (excluding air) in the figure indicate the main flow directions of each fluid flowing through the corresponding pipe, as described above. When these three-way valve type valves are used, Depending on the amount of opening and closing of each valve, the remaining drain that is not used for power generation is thrown into the drainage groove installed below.

  The power generation device 200 according to the second embodiment further includes any one of the above-described atmospheric discharge pipe valve 12, discharge pipe valve 13, drain drain pipe valve 14, and storage drain drain pipe valve 15, or from these. Using two or more appropriately selected valves (except for the case described in the previous paragraph), it is also possible to set the target power generation amount by adjusting the drain generation amount.

Embodiment 3 FIG.
In the first embodiment, the case where the steam discharged from the deaerator 1 is drained using the air cooler 3 and electric power is generated using the drain has been described.
In the third embodiment, as shown in FIG. 4, instead of using the air cooler 3 as the cooler, the condensate flowing in from the condensate pipe 9a is used as the water cooler 16 and used as the cooler. Thus, similarly to the first embodiment, the steam discharged from the deaerator 1 is cooled to generate drain, and the power generator 300 that generates power in the water turbine generator 6 can be obtained. In addition, the arrow in a figure shows the main flow directions of each fluid which flows through a applicable pipe | tube.

  Further, the condensate that has entered the water cooler 16 is heated by the water cooler 16, and then flows into the deaerator 1 through the condensate pipe 9b, so that the temperature of the feed water supplied to the boiler can be raised. it can. Moreover, since the amount of the extraction steam flowing into the deaerator 1 through the extraction steam pipe 8 can be reduced, the thermal efficiency of the entire thermal power plant including the turbine tends to increase.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately changed or omitted. For example, as a water turbine generator, a specific amount of power generation was estimated assuming a micro water turbine generator with an output of about several kW. However, the present invention is not limited to this, and power generation proportional to the output of a thermal power plant is possible. It is possible to set up a turbine generator with quantity in the same way.

  Moreover, as a cooler in the case of using an on-off valve for adjusting the amount of drain generation, the case of a power generation device provided with an air cooler has been described as an example, but not limited to this, it has been described in the third embodiment. The same applies to a power generation apparatus including a water cooler 16 that uses condensate flowing in from the condensate pipe 9 as cooling water.

1 Deaerator, 2 Release pipe, 3 Air cooler, 4 Drain drain pipe, 5 Drain water tank, 6
Water turbine generator, 7 Drain drain pipe, 8 Extraction steam pipe, 9 Condensate pipe, 9a Condensate pipe (water cooler inlet side), 9b Condensate pipe (water cooler outlet side), 10 Water supply pipe, 11 Air Release pipe, 12 Atmospheric release pipe valve, 13 Release pipe valve, 14 Drain drain pipe valve, 15 Reservoir drain drain pipe valve, 16 Water cooler, 100, 200, 300

Claims (5)

A degasser for degassing the dissolved gas contained in the condensate generated by the condenser that cools the steam exhausted by the turbine and returns it to the water;
A discharge pipe for discharging the dissolved gas and the vapor degassed by the deaerator to the outside of the deaerator;
A cooler connected to one outlet of the discharge pipe for cooling the dissolved gas and the vapor to condense the vapor;
A drain drain pipe connected to the other outlet of the discharge pipe and the outlet of the cooler, and draining the drain generated by the condensation of the vapor;
A storage tank for storing drainage drained through the drain drainpipe;
A storage tank drain pipe connected to the storage tank and draining the drain stored in the storage tank from the storage tank;
A turbine generator that has a drop with respect to the storage tank and is installed in the storage drain drain pipe, and generates electricity by rotating a turbine with the drain drained into the storage drain drain pipe;
A power generator with   The power generator according to claim 1, wherein the cooler is an air cooler that cools the dissolved gas and the steam with air.   The cooler is connected to a condensate pipe that sends the condensate generated in the condenser to the deaerator, and the dissolved gas and the condensate flowing in through the condensate pipe are used as cooling water. The power generator according to claim 1, wherein the power generator is a water cooler that cools the steam.   At least one of the discharge pipe, the drain drain pipe, or the storage drain drain pipe is provided with an opening / closing valve, and the drainage amount of the storage tank drain flowing through the storage drain drain pipe by changing the opening / closing amount of the opening / closing valve. The power generator according to any one of claims 1 to 3, wherein the power generator is adjusted.   Opening / closing amount of an on-off valve provided only in the condensate pipe or provided in at least one of the discharge pipe, the drain drain pipe, and the storage drain drain pipe. The power generation device according to claim 3, wherein the amount of drainage of the storage tank drain that flows through the storage tank drainage pipe is adjusted by changing the value.

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