Integration of

Solar Thermal with

Fossil Fuel Plant

By

Amit Kulshreshtha, AGM (PE Mech)

Rajeev Baijal, AGM (PE Civil)

Shaswattam, AGM (Netra)

Deepak, AGM (PE Mech)

B Kamath, AGM (REDG)

13.02.2013

NTPC Portfolio

Coal based Power Plants 23 35719 MW

Gas based Power Plants 07 3955 MW

Total 39674 MW

Solar Projects

1 Under Commissioning 03 20 MW

2 Under Tendering 04 75 MW

3 FR ready 01 15 MW

Total 110 MW

4 FR under preparation 04 350 MW

Solar Technology

Solar Photo Voltaic Solar Thermal

1 Silicon PV with Mono /

Poly crystalline

2 Thin Film

3 Concentrating PV (CPV)

1 Parabolic Trough (PT)

2 Compact Linear Fresnel

Reflector (CLFR)

3 Solar Tower (ST) with Central /

Distributed Tower (s)

4 Dish with Thermal Receiver /

Sterling Engine

Solar Parabolic Trough

Parabolic trough shaped mirrors collect and reflect the solar energy onto receiver tubes positioned along the focal line of parabolic mirrors. Troughs are made to rotate on a north-south axis to track the sun from east to west.

Solar Parabolic Trough

Parabolic trough shaped mirrors collect and reflect the solar energy onto receiver tubes positioned along the focal line of parabolic mirrors. Troughs are made to rotate on a north-south axis to track the sun from east to west.

Solar Parabolic Trough

Parabolic trough shaped mirrors collect and reflect the solar energy onto receiver tubes positioned along the focal line of parabolic mirrors. Troughs are made to rotate on a north-south axis to track the sun from east to west.

SUNPATH

MORNING AFTERNOON

Solar Parabolic Trough

Solar Parabolic Trough

Compact Linear Fresnel Reflector technology uses a reflector made of several long slices of flat mirrors. Mirrors are mounted on trackers and configured to geometrically form a parabola to reflect sunlight onto a receiver tube fixed in the geometric focal line above these mirrors.

Compact Linear Fresnel Reflector

Compact Linear Fresnel Reflector

Compact Linear Fresnel Reflector

Solar Central Tower

Solar Tower deploys numerous large number of flat sun tracking mirrors, known as heliostats, to focus sunlight onto a fixed receiver mounted on a tall tower.

Heliostats

Receiver

Solar Central Tower

Solar Tower deploys numerous large number of flat sun tracking mirrors, known as heliostats, to focus sunlight onto a fixed receiver mounted on a tall tower.

Heliostats

Receivers

Heliostats

Receivers

Power Block

Solar Distributed Tower

Heliostats

Receivers

Solar Distributed Tower

Solar Dish is a parabolic shaped dish, which tracks the sun, through a two axis movement, continuously to gather the solar energy and point focuses the same onto a Thermal receiver / Sterling Engine which is mounted at the focal point.

Solar Dish

Engine

Solar Dish is a parabolic shaped dish, which tracks the sun, through a two axis movement, continuously to gather the solar energy and point focuses the same onto a Thermal receiver / Sterling Engine which is mounted at the focal point.

Solar Dish

Potential of Solar Hybrid

Coal Fired Power Plant

+

Solar Thermal

Adding

Green Power

to

Existing Coal

fleet

Meeting

Renewable Energy

Targets

Reduce Plant

Emissions

Lower fuel cost

and reliance

on fossil fuel

Addresses

the Intermittency

challenge

without

Storage

Lower cost

than

stand alone

Low Man/ MW Ratio

Higher Efficiency

No Start-Stop

Solar Hybrid

at

NTPC Dadri

NTPC Dadri Layout

U#1 TG

210 MW

Land for Solar Field

28 Acres

Integration Options

Option-1

Solar Steam in HP/ IP/ LP turbine

Conventional

Integration Philosophy

Integration Options

Option-2

Solar steam to replace extraction steam to heaters

Turbine

Heater

X To SG /

Deareator

Solar Steam

Feed water/

Condensate

Steam Steam

Generator

Ble

d S

tea

m

Integration Options

Option-3

Solar steam for cooling CW inlet

Condenser CW

pump

VAM

Integration Options Option-4

Solar Steam to preheat feed water to SG

Integration Options Option-4

Solar Steam to preheat feed water to SG

Integration Options Option-4

Solar Steam to preheat feed water to SG

Integration Options Option-4

Solar Steam to preheat feed water to SG

Location NTPC Dadri, NCR

(Dist. Ghaziabad, Uttar Pradesh)

Identified area MGR unloading bulb

Land available 28 acres

Solar Radiation 1949 kWh/m2/yr

(DNI as per Meteonorm)

Project Brief

Solar Field 15 MW (Thermal)

Conversion efficiency 24.39%

Additional output 3.66 MW (Electrical)

Coal Saving 3,250 MT/year

CO2 reduction 4060 MT/year

Project Benefits

Metering

Direct metering of Solar Power separately is

not possible

Proposed on the basis of measurement of

Enthalpy input to the feed water system from

Solar field

Normative efficiency of the cycle for

conversion of Thermal to Electrical energy

Issues

Tariff

CERC has not announced any tariff for Solar

hybrid power plant as on date. As such fresh

PPA for the Solar Power is not possible

Shall be taken up with CERC

•To allow Solar Power generated to be

distributed to all utilities in pro rata basis

•To consider this project as a demo project for

tariff formulation for future hybrid projects

Issues

Thermal Power Capacity 141 GW

@ 1% Solar addition 1400 MW

Coal Saving 1.243 MMT/yr

CO2 reduction 1.553 MMT/yr

Scope for Replication

Implementation of Solar thermal hybrid power plant of

15 MW thermal in NTPC Dadri and integration with

210 MW Unit 1 TG, in parallel to top HP heater, will be

the first of its kind not only in India but the first of its

kind in the integration methodology with any existing

thermal power plant in the world

This will resolve issues like metering and tariff and

pave way for replication of approx 1400 MW of Solar

Energy in the country. This will add power without any

CO2 emission and save precious fossil fuel

Conclusion