CN210485678U

CN210485678U - Be applied to light-concentrating solar energy and take quality of water heat absorber system of overheat section

Info

Publication number: CN210485678U
Application number: CN201921253655.4U
Authority: CN
Inventors: 刘可亮; 许志贵; 应仁丽; 姚飞奇
Original assignee: Hangzhou Boiler Group Co Ltd
Current assignee: Xizi clean energy equipment manufacturing Co.,Ltd.
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-05-08
Anticipated expiration: 2029-08-05

Abstract

The utility model discloses a be applied to light-concentrating solar energy and take quality of water heat absorber system of overheat section, including over heater, evaporimeter, steam pocket, downcomer, tedge, moisturizing valve, breather valve, overheated steam valve, heat absorber valve that drains, the over heater has still included a plurality of isolation valves that realize evaporation, overheated function switch. In the starting stage of the water quality heat absorber system with the condensing solar heat section, the superheater has the function of an evaporator, so that the temperature rise and pressure rise processes of water in the heat absorber can be improved, and the utilization rate of solar energy is improved; the risk of overtemperature of the superheater at the starting stage is eliminated and the reliability of the heat absorber is improved due to evaporative cooling of the working medium in the superheater; the switching between the functions is convenient and fast, and the influence on the operation of a heat absorber system is greatly reduced and can be almost ignored.

Description

Be applied to light-concentrating solar energy and take quality of water heat absorber system of overheat section

Technical Field

The utility model relates to a light-concentrating solar thermal energy utilization, industrial heating field especially relate to a be applied to light-concentrating solar energy and take quality of water heat absorber system of overheat section.

Background

Solar energy and wind energy are important components of renewable energy, and in recent years, in order to solve the problem of environmental pollution and reduce fossil energy consumption, renewable energy substitution with solar energy and wind energy as the core is emerging in various countries in the world. China is a country with abundant solar energy resources and wind power resources. Statistics show that by the end of 2018, the cumulative photovoltaic installed capacity of China is 1.7 hundred million kilowatts (installed capacity accounts for 9%) and the cumulative wind power installed capacity is 1.84 hundred million kilowatts (installed capacity accounts for 9.7%). The proportion of wind energy and solar energy in energy structures in China is gradually increased.

Unlike photovoltaic power generation, concentrated photo-thermal power generation is another important way of solar energy utilization. Because the molten salt has the characteristics of high boiling point, wide liquid phase temperature range, high specific heat capacity, strong heat exchange capacity and the like, the molten salt is an ideal medium for heat transfer and heat storage. And the solar thermal power generation is combined with a fused salt heat storage technology, has the characteristics of thermal coupling and electrolytic coupling, can greatly prolong the power generation time of a photo-thermal unit, and flexibly adjusts the output power according to the power grid dispatching. The characteristics enable the photo-thermal unit to bear basic load or peak regulation in a future power grid structure.

Water/steam is the most common working medium in the power industry and can also be directly used for photo-thermal power generation. This technology of directly generating Steam in a heat absorber by using water as a working medium and using solar energy is called a dsg (direct Steam generation) power generation technology. The DSG technology has the advantages of cheap and easily-obtained working medium, relatively mature technology, low initial investment and the like, and particularly has obvious cost advantage in the fields of being combined with the traditional power generation technology (such as combined cycle units, coal-fired units and the like), or being used for thick oil exploitation, steam heat supply and the like.

The DSG technology generally has higher requirements on the superheat degree of steam, the enthalpy value and the working capacity of the steam can be improved by improving the superheat degree, and meanwhile, the power generation efficiency of the DSG technology can be improved. However, since the heat exchange capacity of the superheated steam is generally low, and the light spots projected onto the heat absorber by the heliostat are difficult to control accurately, the superheated area on the heat absorber is easy to overheat. Particularly, in the starting stage of the heat absorber, because no evaporation amount or small steam flow is generated, the superheater of the heat absorber is easy to cause over-temperature and even damage. Therefore, for the DSG heat absorber with overheating function, the protection of the good overheating area in the starting stage is the key of the heat absorber design.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model relates to a be applied to light-concentrating solar energy and take quality of water heat absorber system of overheat section.

The utility model adopts the following technical scheme:

a water quality heat absorber system applied to a light-gathering solar band overheating section comprises a superheater, an evaporator, a steam pocket, a downcomer and an ascending pipe, wherein the upper end of the evaporator is communicated with the steam pocket through the ascending pipe, a steam pipe is communicated with the steam side of the superheater, a steam pipe connecting pipe is additionally arranged between the superheater inlet end and the steam pocket, an isolating valve B and an isolating valve C are sequentially connected onto the steam pipe connecting pipe, the superheater outlet end is connected with a superheated steam discharge pipe, the steam pipe connecting pipe is positioned on a pipeline between the isolating valve B and the isolating valve C and is communicated with the outlet end of the superheater through a connecting pipe, an isolating valve D is connected onto the connecting pipe, a superheated steam valve is connected onto the superheated steam discharge pipe, the lower end of the evaporator is communicated with the steam pocket through the downcomer, the downcomer is communicated with the lower end through the descending pipe connecting pipe, an isolating valve A is connected onto, the water drain pipe is connected with a water drain valve, the steam pocket is connected with a water replenishing pipe, the water replenishing pipe is connected with a water replenishing valve, the steam pocket is connected with a vent pipe, and the vent pipe is connected with a vent valve.

Preferably, each isolating valve, the water replenishing valve, the vent valve, the superheated steam valve and the water drain valve are electric control valves, and each electric control valve is communicated with a control electric board through a lead.

Preferably, the three-way joints of the pipelines are communicated through three-way joints.

This be applied to light-collecting solar energy and take quality of water heat absorber system of overheat section: and in the starting stage of the heat absorber, water in the steam pocket enters the evaporator and the superheater from the lower part through the downcomer respectively, and the heat absorber receives sunlight reflected by the heliostat field, so that the water temperature in the heat absorber is gradually increased. The function of the superheater at this stage is the same as that of the evaporator, and the superheater and the evaporator heat water in the heat absorber and the steam drum together to gradually complete the processes of temperature rise and pressure rise of water in the system. When the saturated steam pressure in the steam drum reaches a set value, the system discharges water in the superheater by switching of a plurality of isolation valves, the saturated steam flows through the superheater according to a designed flow, heat absorption and temperature rise are continued in the superheater, and finally the superheated steam generated by the system is used for heat supply or power generation.

The utility model has the advantages that: according to the water quality heat absorber system with the overheating section, which is applied to the concentrating solar energy, the superheater plays a role of an evaporator, so that the heating and boosting processes of water in the heat absorber can be improved, and the utilization rate of solar energy is improved; the risk of overtemperature of the superheater at the starting stage is eliminated and the reliability of the heat absorber is improved due to evaporative cooling of the working medium in the superheater; the switching between the functions is convenient and fast, and the influence on the operation of a heat absorber system is greatly reduced and can be almost ignored.

Drawings

Fig. 1 is a schematic diagram of the present invention in a start-up operation mode;

fig. 2 is a schematic diagram of the present invention in the transition switching mode;

fig. 3 is a schematic view of the present invention in a normal operation mode;

FIG. 4 is a schematic view of the present invention in a water discharge mode during shutdown;

in the figure: 1. the system comprises a superheater, 2, an evaporator, 3, a steam pocket, 4, a downcomer, 5, a riser, 6, a water replenishing valve, 7, a superheated steam valve, 8, a water discharging valve, 9 and a vent valve; 11. isolation valves A, 12, isolation valves B, 13, isolation valves C, 14, and isolation valve D.

Detailed Description

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example (b): as shown in attached figures 1-4, a water quality heat absorber system applied to a light-gathering solar band overheating section comprises a superheater 1, an evaporator 2, a steam pocket 3, a downcomer 4 and an ascension pipe 5, wherein the upper end of the evaporator 2 is communicated with the steam pocket 3 through the ascension pipe 5, the inlet end of the superheater 1 is communicated with the steam side of the steam pocket 3 through a steam pipe, a steam connecting pipe is additionally connected between the inlet end of the superheater 1 and the steam pocket, the steam connecting pipe is connected with an isolation valve B12 and an isolation valve C13, the outlet end of the superheater 1 is connected with a superheated steam discharge pipe, the steam connecting pipe is positioned on a pipeline between the isolation valve B12 and the isolation valve C13 and is connected with the outlet end of the superheater 1 through a connecting pipe, the isolation valve D14 is connected with the connecting pipe, the superheated steam discharge pipe is connected with a superheated steam valve 7, the lower end of the evaporator 2 is communicated, an isolating valve A11 is connected to a down pipe connecting pipe, a water drain pipe is connected to the down pipe connecting pipe connected to the lower end of the superheater 1, a water drain valve 8 is connected to the water drain pipe, a water replenishing pipe is connected to the steam pocket 3, a water replenishing valve 6 is connected to the water replenishing pipe, a vent pipe is connected to the steam pocket 3, a vent valve 9 is connected to the vent pipe, an isolating valve A11, an isolating valve B12, an isolating valve C13, an isolating valve D14, a water replenishing valve 6, an overheated steam valve 7, the water drain valve 8 and the vent valve 9 are all electric control valves, and each electric control valve is communicated with a control electric board through a lead. The tee joints of all pipelines are communicated through tee joints.

As shown in fig. 1, the heat absorber system operates in the start mode in which the superheated steam valve 7 and the drain valve 8 are closed, the opening degree of the water replenishment valve 6 is adjusted according to the water level in the drum, and the isolation valve a11, the isolation valve B12, the isolation valve C13, and the isolation valve D14 are all open.

At this stage, water from the steam drum 3 enters the evaporator 2 and the superheater 1 from the lower part through the downcomer 4, sunlight reflected by the heliostat is absorbed by the light receiving surface of the heat absorber, the water flowing through the evaporator 2 and the superheater 1 is heated, the temperature rises or gradually rises after evaporation occurs, and the water returns to the steam drum 3 through the riser 5. The superheater 1 and the evaporator 2 have the same function in the starting mode of the heat absorber, and the superheater and the evaporator run in parallel to absorb heat generated by solar energy, gradually increase the temperature of water in the steam drum and gradually increase the saturation pressure in the steam drum. The vent valve 9 is opened at the initial temperature rise stage to discharge the air in the steam drum, and is closed after the water temperature in the steam drum rises to the saturation temperature, so that the temperature and the pressure in the steam drum gradually rise.

The absorber enters the transition switching mode when the temperature, pressure in the drum reaches a predetermined value, as shown in fig. 2. In this mode, isolation valve a11 and isolation valve B12 are closed, while the absorber drain valve 8 is opened; in the process, the heat flux density on the surface of the heat absorber is controlled within a safety range, the isolation valve C13 and the isolation valve D14 are kept in an open state, the superheated steam valve 7 and the vent valve 9 are kept in a closed state, and the opening degree of the water supplementing valve 6 is adjusted according to the liquid level of the steam pocket 3.

At this stage, the evaporator 2 can operate in the normal mode, but the energy flow distribution on the surface of the superheater 1 needs to be controlled to avoid the overheating of the superheater 1. Saturated steam from the steam drum 3 enters the superheater 1 from the upper part through the isolation valve C13 and the isolation valve D14, and water in the superheater 1 is gradually discharged through the heat absorber water drain valve 8.

When the water in the superheater is emptied, the heat absorber switches to normal operation mode. As shown in fig. 3, the absorber drain valve 8 is closed, isolation valve C13 and isolation valve D14 are closed, superheated steam valve 7 is opened, and the water drain and bleed air above the superheated steam line are opened; meanwhile, the isolation valve A11, the isolation valve B12 and the vent valve 9 are kept in a closed state, and the opening degree of the water replenishing valve 6 is adjusted according to the water level of the steam pocket. The energy input into the heat absorber is gradually increased, so that the output parameters of the heat absorber gradually reach the set values.

At this stage, water in the steam drum 3 enters the lower part of the evaporator 2 from the downcomer 4, heat energy converted from solar radiation is absorbed in the evaporator, the process of temperature rise or evaporation is gradually completed, the steam-water mixture returns to the steam drum 3 from the riser 5, and the separation of steam and water is completed in the steam drum. Saturated steam from the steam pocket 3 enters the superheater 1, absorbs heat and heats in the superheater 1, and finally enters a main steam pipeline through a superheated steam valve 7, and superheated steam generated by the heat absorber is conveyed to a steam power system to do work and generate power or is directly supplied to a heat user.

And after the heat absorber system stops running, if the heat absorber system is planned to be stopped for a long time or the heat absorber system has a risk of icing, switching from the normal working mode to a shutdown water drainage mode. As shown in fig. 4, firstly, the solar spot on the surface of the heat absorber is removed, the water supply valve 6 and the superheated steam valve 7 are closed, the temperature of the superheater 1 is reduced under air cooling, gradually approaches the temperature of the evaporator 2, when the temperature is reduced to a preset value, the water supply valve 8 and the ventilation valve 9 are opened, and the isolation valve a11, the isolation valve B12, the isolation valve C13 and the isolation valve D14 are opened.

When the heat absorption system is in a water discharging mode, one path of water in the steam pocket passes through a downcomer, an evaporator and an isolating valve A11 and is discharged from a water discharging valve 8; and the other path is discharged through an isolation valve 12, an isolation valve C13, a superheater 1 and a water discharge valve 8, or is discharged through an isolation valve B12, an isolation valve D14, the superheater 1 and the water discharge valve 8. In the stage of water discharge of the system, the evaporator 2 and the superheater 1 are simultaneously used as water discharge channels, so that the water discharge speed can be increased. The ventilation valve 9 is opened to balance the pressure in the heat absorber in time, so as to avoid the damage of negative pressure to the system. After the water in the heat absorber system is emptied, the risk of icing can be eliminated, and the heat absorber system which is shut down for a long time can be protected.

This be applied to quality of water heat absorber system of spotlight formula solar energy area overheat section can be used in solar energy high temperature thermal-arrest and industry heat supply field, can protect the security of over heater in the start-up stage, makes the over heater avoid the risk of overtemperature, damage, has improved the utilization ratio of solar energy simultaneously, makes heat absorber system parameter can reach the target value sooner. The system has wide application prospect.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the claims.

Claims

1. A water quality heat absorber system applied to a light-gathering solar band overheating section is characterized by comprising a superheater (1), an evaporator (2), a steam pocket (3), a downcomer (4) and an ascending pipe (5), wherein the upper end of the evaporator (2) is communicated with the steam pocket (3) through the ascending pipe (5), steam pipes are communicated with the inlet end of the superheater (1) and the steam side of the steam pocket (3), a steam pipe connecting pipe is additionally arranged between the inlet end of the superheater (1) and the steam pocket (3), an isolating valve B (12) and an isolating valve C (13) are connected onto the steam pipe connecting pipe, the outlet end of the superheater (1) is connected with an overheated steam discharge pipe, the steam pipe is positioned on a pipeline between the isolating valve B (12) connecting pipe and the isolating valve C (13) and is communicated with the outlet end of the superheater (1) through a connecting pipe, an isolating valve D (14) is connected onto the connecting pipe, the lower end of the evaporator (2) is communicated with the steam pocket (3) through a down pipe (4), the down pipe (4) is communicated with the lower end of the superheater (1) through a down pipe connecting pipe, an isolating valve A (11) is connected onto the down pipe connecting pipe, a water drain pipe is connected onto the down pipe connecting pipe connected with the lower end of the superheater (1), a water drain valve (8) is connected onto the water drain pipe, a water replenishing pipe is connected onto the steam pocket (3), a water replenishing valve (6) is connected onto the water replenishing pipe, a vent pipe is connected onto the steam pocket (3), and a vent valve (9) is connected onto the vent.

2. The system for the water quality heat absorber with the overheating section applied to the concentrating solar energy is characterized in that the isolating valve A (11), the isolating valve B (12), the isolating valve C (13), the isolating valve D (14), the water replenishing valve (6), the overheated steam valve (7), the water discharging valve (8) and the vent valve (9) are all electric control valves, and the electric control valves are communicated with a control electric board through leads.