CN111521050B - Heating system based on waste heat recovery from boiler - Google Patents

Abstract

The invention provides a heat supply system based on boiler body waste heat recovery, comprising: the device comprises a water tank, a water pump, a separated heat pipe, a heat exchanger and a temperature sensing bulb; the separated heat pipe is internally provided with a working medium and comprises an evaporation section and a condensation section, an insulating layer is laid on the outer sides of the evaporation section and the condensation section, the condensation section is arranged at the top of the hearth, and the evaporation section is tightly attached to the front wall of the hearth; the heat exchanger is arranged in the condensation section, the outlet of the heat exchanger is communicated with a water supply pipe, water in the water tank is pumped into the heat exchanger through the water pump, and a constant temperature control valve for adjusting the water quantity is arranged between the heat exchanger and the water pump; the temperature sensing bag is positioned in the water supply pipe and connected with the constant temperature control valve, and is used for sensing the water temperature of the water supply pipe and controlling the opening degree of the constant temperature control valve. The invention can fully utilize the waste heat of the hearth to heat water, reduce the loss of heat of the front wall of the hearth, improve the energy utilization rate, improve the environment of staff and reduce the potential safety hazard.

Description

Heating system based on waste heat recovery from boiler

Technical Field

The invention relates to the technical field of power station boilers and energy recovery and utilization, and in particular to a heating system based on recovery of waste heat from a boiler body.

Background Art

At present, the upper part of the furnace of the circulating fluidized bed boiler in the power station has poor heat collection effect due to the water-cooled wall tubes. The heat inside the furnace is dissipated outward, resulting in a high temperature on the outside of the furnace wall. This part of the heat is not reasonably utilized. This part of the heat is directly discharged into the air, which will not only accelerate global warming, but also cause energy waste. In addition, the workers are exposed to high temperature environments for a long time, which will also have adverse effects on their health.

The utility model patent with application number 201420233043.X discloses a boiler waste heat power generation device, in which the core component is a thermoelectric power generation sheet. Although this waste heat recovery device has a simple structure and is easy to install, the temperature of the boiler body is around 100°C, and the efficiency of the thermoelectric power generation sheet is low. In addition, the greater the temperature difference between the two sides of the thermoelectric power generation sheet, the better the power generation efficiency. When using this device, the temperature on the low temperature side must be low enough to ensure the power generation efficiency.

Summary of the invention

In order to avoid a large amount of heat being wasted in actual production, improve the environment of the staff, reduce safety hazards, and improve energy utilization, the present invention proposes a heat pipe hot water supply system that utilizes the waste heat of the boiler body. The system has a simple structure and utilizes the characteristics of high heat transfer efficiency and wide operating temperature range of the separated heat pipe. It can be installed in the existing furnace without the need to modify the furnace and will not affect the operation of the boiler. The system can not only solve the problem of recycling and reusing the waste heat of the boiler body, but also minimize the damage to the staff caused by high temperature.

In order to achieve the above object, the present invention has been designed as follows:

A heating system based on waste heat recovery of a boiler body comprises: a water tank, a water pump, a thermostatic control valve, a separate heat pipe, a heat exchanger and a temperature sensing bag; wherein the separate heat pipe has a working medium, the separate heat pipe comprises an evaporation section and a condensation section, an insulation layer is laid on the outside of the evaporation section and the condensation section, the condensation section is located at the top of the furnace, and the evaporation section is close to the front wall of the furnace; the heat exchanger is arranged in the condensation section, the outlet of the heat exchanger is connected with a water supply pipe, the inlet of the heat exchanger is connected with the outlet of the thermostatic control valve through a first pipeline, the inlet of the thermostatic control valve is connected with the outlet of the water pump through a second pipeline, the inlet of the water pump is connected with a third pipeline, the third pipeline extends into the water tank, the water pump is used to pump water from the water tank into the heat exchanger, and the thermostatic control valve is used to control the amount of water supply; the temperature sensing bag is located in the water supply pipe, and the temperature sensing bag is connected to the thermostatic control valve, the temperature sensing bag is used to sense the water temperature of the water supply pipe and control the opening of the thermostatic control valve.

In addition, the preferred structure is that the evaporation section includes evaporation section branch pipes arranged at equal intervals, the condensation section includes condensation section branch pipes arranged at equal intervals, the outlet of the evaporation section branch pipe is connected to the inlet of the condensation section branch pipe, and the outlet of the condensation section branch pipe is connected to the inlet of the evaporation section branch pipe, and the working medium circulates in the evaporation section branch pipe and the condensation section branch pipe.

Compared with the prior art, the present invention has the following beneficial effects:

The water in the heat exchanger is heated by the heat exchange of the separate heat pipe, thereby making full use of the waste heat of the furnace, reducing the heat loss to the front wall of the furnace, improving energy utilization, and at the same time improving the environment of the staff and reducing safety hazards.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below with reference to the accompanying drawings and specific embodiments:

FIG1 is a schematic diagram of the overall structure of a heating system based on boiler body waste heat recovery provided by an embodiment of the present invention;

FIG2 is a side view of a condensing section of a separate heat pipe provided in an embodiment of the present invention;

FIG. 3 is a side view of the evaporation section of the separate heat pipe provided in an embodiment of the present invention.

In the figure: 1-water tank, 2-water pump, 3-constant temperature control valve, separate heat pipe-4, 41-evaporation section, 42-condensation section, 411-evaporation section branch pipe, 421-condensation section branch pipe, 5-heat exchanger, 6-temperature sensing package, 7-insulation layer, 8-front wall, 9-water supply pipe.

The same reference numerals throughout the drawings indicate similar or corresponding features or functions.

DETAILED DESCRIPTION

In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

FIG1 shows the overall structure of a heating system based on boiler body waste heat recovery provided by an embodiment of the present invention.

As shown in FIG1 , the heating system based on the waste heat recovery of the boiler body provided by the present invention comprises: a water tank 1, a water pump 2, a thermostatic control valve 3, a separate heat pipe 4, a heat exchanger 5 and a temperature sensing package 6; wherein, a working medium is placed in the separate heat pipe 4, which is used to absorb heat first and then release heat to realize heat exchange, and the separate heat pipe comprises an upper and lower section, namely an evaporation section 41 and a condensation section 42, the condensation section 42 is located above the evaporation section 41, and the condensation section 42 is located on the top of the furnace, and the evaporation section 41 is close to the front wall 8 of the furnace, and the working medium is in liquid state in the evaporation section 41, which is used to absorb the waste heat of the furnace wall, and changes phase to gas state after reaching the boiling point, and the working medium moves upward to the condensation section 42 under the action of a small pressure difference, and releases heat to the outside here, and when the working medium temperature drops to the condensation temperature, the gaseous working medium condenses into a liquid working medium, and flows back into the evaporation section 41 under the action of gravity for repeated circulation. A heat-insulating layer 7 is provided on the outer sides of the evaporation section 41 and the condensation section 42 to insulate the separation heat pipe 4 .

2 and 3 respectively show the side view structures of the condensation section and the evaporation section of the separate heat pipe provided in the embodiment of the present invention.

As shown in Fig. 2 and Fig. 3, the evaporation section includes evaporation section branches 411 arranged at equal intervals, and the condensation section includes condensation section branches 421 arranged at equal intervals, and the insulation layer 7 is wrapped around the outside of the evaporation section branches 411 and the condensation section branches 421. The outlet of the evaporation section branches 411 is connected to the inlet of the condensation section branches 421, and the outlet of the condensation section branches 421 is connected to the inlet of the evaporation section branches 411. After the working medium changes into gaseous state, it enters the condensation section branches 421 from the outlet of the evaporation section branches 411 and the inlet of the condensation section branches 421. When it changes into liquid state again, it flows back to the evaporation section branches 411 from the outlet of the condensation section branches 421 and the inlet of the evaporation section branches 411, realizing a circulating flow.

The heat exchanger 5 is arranged in the condensing section 42, and the outlet of the heat exchanger is connected to the water supply pipe 9. The inlet of the heat exchanger 5 is connected to the outlet of the thermostatic control valve 3 through a first pipeline, and the inlet of the thermostatic control valve 3 is connected to the outlet of the water pump 2 through a second pipeline. The inlet of the water pump 2 is connected to the third pipeline, and the third pipeline extends into the water tank 1. The water pump 2 is used to pump the water in the water tank 1 into the heat exchanger 5. After absorbing the heat released by the working medium, the water in the heat exchanger flows out from the water supply pipe 9 for heating.

The temperature sensing package 6 is located in the water supply pipe 9 and is connected to the constant temperature control valve 3. The temperature sensing package 6 is used to sense the temperature of the water in the water supply pipe 9 and control the opening of the constant temperature control valve 3. The water supply is adjusted by the opening of the constant temperature control valve 3.

When the water supply temperature exceeds the preset maximum temperature, the opening of the thermostatic control valve 5 increases, the water supply amount increases, and the water supply temperature decreases; conversely, when the water supply temperature is lower than the preset minimum temperature, the opening of the thermostatic control valve 5 decreases, the water supply amount decreases, and the water supply temperature increases.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (2)

1. Heating system based on boiler body waste heat recovery, characterized in that includes: the device comprises a water tank (1), a water pump (2), a constant temperature control valve (3), a separation type heat pipe (4), a heat exchanger (5) and a temperature sensing bag (6); the heat pipe comprises a separation type heat pipe (4), wherein working media are arranged in the separation type heat pipe (4), the separation type heat pipe (4) comprises an evaporation section (41) and a condensation section (42), an insulation layer (7) is arranged on the outer sides of the evaporation section (41) and the condensation section (42), the condensation section (42) is arranged at the top of a hearth, and the evaporation section (41) is tightly attached to a front wall (8) of the hearth;

The heat exchanger (5) is arranged in the condensation section (42), the outlet of the heat exchanger (5) is communicated with the water supply pipe (9), the inlet of the heat exchanger (5) is connected with the outlet of the constant temperature control valve (3) through a first pipeline, the inlet of the constant temperature control valve (3) is connected with the outlet of the water pump (2) through a second pipeline, the inlet of the water pump (2) is connected with a third pipeline, the third pipeline stretches into the water tank (1), the water pump (2) is used for pumping the water of the water tank (1) into the heat exchanger (5), and the constant temperature control valve (3) is used for controlling the water supply quantity;

The temperature sensing bag (6) is located in the water supply pipe (9), the temperature sensing bag (6) is connected with the constant temperature control valve (3), and the temperature sensing bag (6) is used for sensing the water temperature of the water supply pipe (9) and controlling the opening degree of the constant temperature control valve (3).

2. The heat supply system based on the waste heat recovery of the boiler body according to claim 1, wherein the evaporation section (41) comprises equally spaced evaporation section branch pipes (411), the condensation section (42) comprises equally spaced condensation section branch pipes (421), an outlet of the evaporation section branch pipes (411) is communicated with an inlet of the condensation section branch pipes (421), an outlet of the condensation section branch pipes (421) is communicated with an inlet of the evaporation section branch pipes (411), and the working medium circularly flows in the evaporation section branch pipes (411) and the condensation section branch pipes (421).