阅读说明：本技术 一种利用排汽余热发电的自然通风空冷系统及方法 (Natural ventilation air cooling system and method for generating power by utilizing exhaust waste heat ) 是由 薛海君 于 2019-10-17 设计创作，主要内容包括：本发明涉及一种利用排汽余热发电的自然通风空冷系统,包括锅炉、蒸汽管道、蒸汽轮机发电机组、空冷器、自然通风塔、热流体管道和冷流体管道,空冷器在自然通风塔底部外部沿圆周垂直布置,或者空冷器在自然通风塔下部内部水平布置,在自然通风塔底部沿圆周布置多台水平轴风力发电机。本发明利用汽轮机乏汽余热在自然通风塔底部产生的空气流动力进行发电,提高了燃煤电厂的发电效率,增加了发电量。(The invention relates to a natural ventilation air cooling system for generating power by utilizing exhaust steam waste heat, which comprises a boiler, a steam pipeline, a steam turbine generator set, an air cooler, a natural ventilation tower, a hot fluid pipeline and a cold fluid pipeline, wherein the air cooler is vertically arranged at the outer part of the bottom of the natural ventilation tower along the circumference, or the air cooler is horizontally arranged at the inner part of the lower part of the natural ventilation tower, and a plurality of horizontal shaft wind driven generators are arranged at the bottom of the natural ventilation tower along the circumference. The invention utilizes the air flow power generated by the waste heat of the steam turbine at the bottom of the natural ventilation tower to generate electricity, thereby improving the generating efficiency of the coal-fired power plant and increasing the generating capacity.)

1. The utility model provides an utilize exhaust waste heat power generation's natural draft air cooling system, includes boiler (1), steam conduit (2), steam turbine generating set (3), air cooler (4), natural draft tower (5), hot-fluid pipeline (6) and cold fluid pipeline (7), its characterized in that: the air cooler (4) is vertically arranged at the outer part of the bottom of the natural ventilation tower (5) along the circumference, or the air cooler (4) is horizontally arranged in the lower part of the natural ventilation tower (5), and a plurality of horizontal-axis wind driven generators (8) are arranged at the bottom of the natural ventilation tower (5) along the circumference.

2. The natural ventilation air cooling system for generating power by using the waste heat of the exhausted steam as claimed in claim 1, is characterized in that: the natural ventilation air cooling system is a direct air cooling system.

3. The natural ventilation air cooling system for generating power by using the waste heat of the exhausted steam as claimed in claim 1, is characterized in that: the natural ventilation air cooling system is an indirect air cooling system and further comprises a water-cooling condenser (10) and a condensed water pipeline (9).

4. The natural draft air cooling system for generating electricity by using the waste heat of exhaust steam according to claim 1, 2 or 3, wherein: the air cooler (4) comprises a plurality of V-shaped cooling triangles or a plurality of inverted V-shaped cooling triangles.

5. The natural ventilation air cooling system for generating power by using the waste heat of the exhausted steam as claimed in claim 1, is characterized in that: the wind power generator (8) is arranged outside the natural ventilation tower (5) or inside the natural ventilation tower (5).

6. The natural draft air cooling system for generating electricity by using the waste heat of exhaust steam according to claim 1, 2 or 3, wherein: the height of the natural ventilation tower (5) is 120-210 m.

7. The natural draft air cooling system for generating electricity by using the waste heat of exhaust steam according to claim 1, 2 or 3, wherein: the diameter range of the wind wheel of the wind driven generator (8) is 10-36 m.

8. A method for generating power by utilizing exhaust steam waste heat is characterized by comprising the following steps: the natural draft air cooling system of any one of claims 1 to 7 including the steps of: the air cooler releases the waste heat, the cold air is heated after passing through the air cooler to rise in temperature and becomes hot air to flow into the natural ventilation tower, the hot air and the cold air outside the tower form density difference to generate buoyancy, the bottom of the natural ventilation tower has strong pumping force under the action of the tower height, the air inside and outside the tower is driven to flow, and the wind driven generator is driven to generate electricity.

Technical Field

The invention relates to a natural ventilation air cooling system and a natural ventilation air cooling method for generating power by utilizing exhaust steam waste heat, which are used for exhaust steam condensation and waste heat power generation of a steam turbine of a thermal power plant or similar steam driving equipment.

Background

The power generation efficiency of a coal-fired power plant is about 40%, and most of the heat energy generated in the boiler combustion is discharged as waste heat. In the power generation process, the dead steam condensation heat (latent heat) discharged by the low-pressure cylinder of the steam turbine accounts for about 52% of the total input energy, and a large amount of waste heat is used as cold end loss and is not utilized.

In order to save water resources, many power plants employ natural draft air cooling systems. Natural draft air cooling systems are classified into direct air cooling systems and indirect air cooling systems according to the way in which the exhaust steam enters the air cooler. The direct air cooling system of natural draft includes: the system comprises a boiler, a steam pipeline, a steam turbine generator set, an air cooler, a natural ventilation tower, a hot fluid pipeline and a cold fluid pipeline; high-temperature and high-pressure steam generated by the boiler is acted in a steam turbine generator set to become low-pressure and low-temperature exhaust steam, the exhaust steam is directly discharged into an air cooler through a hot fluid pipeline, water is condensed in the air cooler, and meanwhile, waste heat is released into external air. The indirect air cooling system of natural ventilation is different from the direct air cooling system, exhaust steam is condensed in a water-cooling condenser, and the condensation heat of the exhaust steam is taken away by circulating water and enters an air cooler through a hot fluid pipeline to be released. The natural draft tower functions in an air cooling system to provide the suction (air driving force) required to move air through the air cooler.

The existing natural ventilation air cooling system has the following defects: a large amount of waste heat is not utilized, and the power generation efficiency is still low.

Disclosure of Invention

The invention aims to overcome the defects and provides a natural ventilation air cooling system and a natural ventilation air cooling method for generating power by using exhaust waste heat, so that the power generation capacity is increased, and the power generation efficiency of a coal-fired power plant is further improved.

The purpose of the invention is realized as follows:

the utility model provides an utilize exhaust waste heat power generation's natural draft air cooling system, includes boiler, steam conduit, steam turbine generating set, air cooler, natural draft tower, hot-fluid pipeline and cold fluid pipeline, and the air cooler is arranged perpendicularly along the circumference in the outside of natural draft tower bottom, and perhaps the air cooler is arranged at the inside level of natural draft tower lower part, arranges many horizontal axis aerogenerators along the circumference in natural draft tower bottom.

Preferably, the natural draft air cooling system is a direct air cooling system.

Preferably, the natural ventilation air cooling system is an indirect air cooling system, and further comprises a water-cooling condenser and a condensed water pipeline.

Preferably, the air cooler comprises a plurality of "V" shaped cooling triangles or a plurality of inverted "V" shaped cooling triangles.

Preferably, the wind power generator is arranged outside or inside the natural draft tower.

Preferably, the height of the natural draft tower is 120 meters to 210 meters.

Preferably, the diameter of the wind wheel of the wind driven generator is in the range of 10-36 meters.

The method for generating power by utilizing exhaust steam waste heat adopts the natural ventilation air cooling system, and comprises the following steps: the air cooler releases the waste heat, the cold air is heated after passing through the air cooler to rise in temperature and becomes hot air to flow into the natural ventilation tower, the hot air and the cold air outside the tower form density difference to generate buoyancy, the bottom of the natural ventilation tower has strong pumping force under the action of the tower height, the air inside and outside the tower is driven to flow, and the wind driven generator is driven to generate electricity.

The invention has the beneficial effects that:

the invention utilizes the air flow power generated by the waste heat of the steam turbine at the bottom of the natural ventilation tower to generate electricity, thereby improving the generating efficiency of the coal-fired power plant and increasing the generating capacity.

Drawings

Fig. 1 is a schematic view (direct air cooling system) of example 1 of the present invention.

Fig. 2 is a plan view of an arrangement of an air cooler and a wind power generator according to embodiment 1 of the present invention.

Fig. 3 is a schematic view (indirect air cooling system) of example 2 of the present invention.

Fig. 4 is a schematic view (direct air cooling system) of example 3 of the present invention.

Fig. 5 is a plan view of an arrangement of an air cooler and a wind power generator according to embodiment 3 of the present invention.

Fig. 6 is a schematic view of embodiment 4 of the present invention.

FIG. 7 is a top view of an air cooler and a wind driven generator according to example 4 of the present invention.

FIG. 8 is a schematic view of embodiment 5 of the present invention.

In the figure: 1. a boiler; 2. a steam line; 3. a steam turbine generator set; 4. an air cooler; 5. a natural draft tower; 6. a hot fluid conduit; 7. a cold fluid conduit; 8. a wind power generator; 9. a condensate pipeline; 10. and a water-cooled condenser.

Detailed Description