Hybrid power generation system using solar energy and bioenergy

Patent metadata

Field	Value
Publication number	US-10072530-B2
Application number	US-201615289992-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Apr 11, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A hybrid power generation system using solar energy and bioenergy, including a solar thermal boiler system, a biomass boiler system, and a turbogenerator system. The solar thermal boiler system includes a trough solar collector, a heat collector, an oil circulating pump, a storage tank for storing heat transfer oil, a solar thermal heater, a solar thermal evaporator, a main pipe transporting saturated steam, and an auxiliary boiler. Heat transfer oil output from a solar light field of the solar thermal boiler system is transmitted through and transfers heat to the solar thermal evaporator and the solar thermal heater, and the heat transfer oil returns to the storage tank for storing heat transfer oil. The heat transfer oil in the storage tank is pumped to the solar light field via the oil circulating pump.

First claim

The invention claimed is:

1. A hybrid power generation system, comprising:
a solar thermal boiler system, the solar thermal boiler system comprising a trough solar collector, a heat collector, an oil circulating pump, a storage tank for storing heat transfer oil, a solar thermal heater, a solar thermal evaporator, a main pipe transporting saturated steam, an auxiliary boiler, and a first flow distributor;
a biomass boiler system; and
a turbogenerator system, the turbogenerator system comprising a turbine, a generator, a condenser, a condensate pump, a first heater, a deaerator, a feed water pump, and a second heater;
wherein:
the trough solar collector is integrated with the heat collector to form a unit, and a plurality of units are connected in parallel or in series to form a solar light field for collecting solar energy and transforming the solar energy into heat carried by the heat transfer oil;
the solar light field is connected to the solar thermal evaporator and the solar thermal heater;
the oil circulating pump is adapted to pump the heat transfer oil in the storage tank to the solar light field;
the solar thermal evaporator is adapted to generate a solar thermal steam by the heat carried by the heat transfer oil;
the auxiliary boiler is parallel to the solar thermal evaporator and the solar thermal heater, and is adapted to generate an auxiliary steam by utilizing heat transformed from an auxiliary heat source instead of the solar energy;
the auxiliary boiler and the solar thermal evaporator are connected to the main pipe, and the main pipe is adapted to mix the solar thermal steam and the auxiliary steam respectively generated by the solar thermal evaporator and the auxiliary boiler into a mixed steam;
a flow of the mixed steam is constant, and a flow ratio of the solar thermal steam to the auxiliary steam is adjustable;
the first flow distributor is connected to the main pipe via the solar thermal heater, the solar thermal evaporator, and the auxiliary boiler;
the first flow distributor is adapted to adjust the flow ratio of the solar thermal steam to the auxiliary steam according to an intensity of the solar energy;
the main pipe is connected to the biomass boiler system; the biomass boiler system is adapted to produce a biomass steam, and superheat the mixed steam output from the solar thermal boiler system and the biomass steam into a superheated steam;
a flow of the biomass steam is constant;
the turbine is connected to the biomass boiler system for receiving the superheated steam, and the generator is connected to the turbine; the superheated steam expands in the turbine and drives the generator to generate electricity;
the turbine is connected to the condenser; the condenser is adapted to condense waste steam of the turbine to be a condensate;
the condensate is pressurized by the condensate pump, and the condensate pump is connected to the first heater; the first heater is adapted to heat the condensate, and the first heater is connected to the deaerator to produce a feed water; the feed water output from the deaerator is pumped to the second heater via the feed water pump; the second heater is adapted to heat the feed water; and
when in use, the heat transfer oil output from the solar light field of the solar thermal boiler system is transmitted through and transfers heat to the solar thermal evaporator and the solar thermal heater, and the heat transfer oil returns to the storage tank; the heat transfer oil in the storage tank is pumped to the solar light field via the oil circulating pump; the solar thermal steam generated at the solar thermal evaporator is transmitted through the main pipe transporting saturated steam to the biomass boiler system; the auxiliary steam is transmitted through the main pipe in which the auxiliary steam is mixed with the solar thermal steam generated at the solar thermal evaporator to the biomass boiler system; the mixed steam and the biomass steam generated by the biomass boiler system are superheated to 540° C.±5° C. in the biomass boiler system; and the superheated steam is transmitted to the turbine and expands in the turbine to drive the generator to generate electricity.

2. The power generation system of claim 1 , wherein the waste steam of the turbine is delivered to the condenser and is condensed to be the condensate; the condensate is pressurized by the condensate pump and is transmitted to the first heater in which the condensate is heated and is transmitted to the deaerator to produce the feed water; the feed water output from the deaerator is pumped to the second heater to be heated via the feed water pump; a heating temperature in the second heater is 240° C.±5° C.; the feed water is distributed by a second flow distributor to be two parts: a first part of the feed water is transmitted to the biomass boiler system to produce the biomass steam, and a second part of the feed water is transmitted to the solar thermal boiler system; the second part of the feed water is distributed to be a part A and a part B; the part A is transmitted to the solar thermal heater, and the part B is transmitted to the auxiliary boiler; the first flow distributor is adapted to adjust a flow ratio of part A to part B according to the intensity of the solar energy; the second part of the feed water which enters the solar thermal boiler system is used to produce the mixed steam, and a circulation of working medium is completed.

3. The power generation system of claim 1 , wherein a temperature of the heat transfer oil when the heat transfer oil is output from the solar light field is below 380° C.; a temperature of the heat transfer oil when the heat transfer oil returns the storage tank is 280° C.±10° C.

4. The power generation system of claim 2 , wherein a temperature of the heat transfer oil when the heat transfer oil is output from the solar light field is below 380° C.; a temperature of the heat transfer oil when the heat transfer oil returns the storage tank is 280° C.±10° C.

5. The power generation system of claim 1 , wherein a pressure of the solar thermal steam generated by the solar thermal evaporator is the same as a pressure of the auxiliary steam generated by the auxiliary boiler.

6. The power generation system of claim 2 , wherein a pressure of the solar thermal steam generated by the solar thermal evaporator is the same as a pressure of the auxiliary steam generated by the auxiliary boiler.

7. The power generation system of claim 1 , wherein the auxiliary steam generated by the auxiliary boiler is complementary with the solar thermal steam generated at the solar thermal evaporator; and an adjustable load range of the auxiliary boiler is between 30% and 100%.

8. The power generation system of claim 2 , wherein the auxiliary steam generated by the auxiliary boiler is complementary with the solar thermal steam generated at the solar thermal evaporator; and an adjustable load range of the auxiliary boiler is between 30% and 100%.

9. The power generation system of claim 1 , wherein the biomass boiler system is adapted to generate the biomass steam and superheat other saturated steam; the biomass boiler works to achieve 55% of feed water heating and evaporation, and 100% of steam superheating.

10. The power generation system of claim 2 , wherein the biomass boiler system is adapted to generate the biomass steam and superheat other saturated steam; the biomass boiler works to achieve 55% of feed water heating and evaporation, and 100% of steam superheating.

11. The power generation system of claim 1 , wherein the feed water output from the second heater is distributed by a second flow distributor to be two parts: a first part of the feed water is t

Assignees

• Wuhan Kaidi Eng Tech Res Inst

Inventors

• Chen Yilong
• Zhang Yanfeng
• Liu Wenyan

Classifications

• F03G6/068 Primary

  having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear · CPC title

• F01D15/10

  Adaptations for driving, or combinations with, electric generators · CPC title

• F03G7/00

  Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for · CPC title

• F05D2220/76

  an electrical generator · CPC title

• F01K3/18 Primary

  having heaters (having both steam accumulator and heater F01K3/14; steam heaters per se F22) · CPC title