CN216744418U

CN216744418U - Boiler smoke heat recovery system

Info

Publication number: CN216744418U
Application number: CN202123411741.3U
Authority: CN
Inventors: 潘建良; 杨海平; 嵇泉
Original assignee: Deqing County Zhongneng Cogeneration Co ltd
Current assignee: Deqing County Zhongneng Cogeneration Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-14
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a boiler smoke exhaust heat recovery system which comprises a heat recovery system body, wherein the heat recovery system body comprises a smoke heat exchange device, a smoke inlet pipe and a smoke exhaust pipe, the smoke heat exchange device is vertically arranged on the ground through a support frame, the bottom of the smoke heat exchange device is communicated with the smoke inlet pipe to introduce dedusted smoke, the side wall of the smoke heat exchange device is provided with a demineralized water inlet and a demineralized water outlet, the top of the smoke heat exchange device is communicated with the smoke exhaust pipe to exhaust the heat-exchanged smoke, and the far end of the smoke exhaust pipe is connected with a desulfurizing tower; the smoke inlet pipeline and the smoke exhaust pipeline are both provided with manholes for personnel to enter for maintenance; a first-stage heat exchanger, a second-stage heat exchanger and a third-stage heat exchanger which are sequentially arranged from bottom to top are arranged in the flue gas heat exchange device, and each stage of heat exchanger is provided with a corresponding demineralized water inlet and a corresponding demineralized water outlet in a matched manner; and a funnel-shaped smoke guide port is arranged at the bottom of the smoke heat exchange device.

Description

Boiler smoke heat recovery system

Technical Field

The utility model relates to the technical field of flue gas heat recovery equipment, in particular to a boiler exhaust smoke heat recovery system.

Background

The utilization of the medium-temperature steam (extraction steam) in the thermal power plant for supplying heat to cities, industrial parks and the like is an effective means for improving the energy conversion efficiency of the thermal power plant, is also an effective measure for reducing the emission of greenhouse gases, and is one of the energy-saving popularization techniques of the national development and improvement committee. The low-temperature heat source heat supply is to supply heat to users by using dead steam which is used by a steam turbine of a thermal power plant to do work, is a great technical breakthrough on the basis of medium-temperature heat supply (steam extraction heat supply), and effectively improves the energy conversion efficiency of the thermal power plant. The low-temperature heat source supplies heat by using an original condenser (a non-direct air cooling unit and a condenser are specially designed) or a special low-temperature steam heating network heater (a direct air cooling unit) to heat circulating water of a heating network, and the energy output is increased by about 30 percent compared with the steam extraction heat supply. However, in cold weather, the circulating water heated by the low-temperature heat source cannot meet the heat supply requirement, and the circulating water is required to be continuously heated by using medium-temperature steam (extracted steam). In the prior art, flue gas generated by a boiler is treated and then directly discharged into the atmosphere, and flue gas waste heat also enters the atmosphere, so that energy waste is caused. In order to realize the aim of carbon neutralization in China as expected, energy conservation, emission reduction and reduction of coal consumption of coal-fired boilers are imperative. With the increasing demand for environmental protection, various environmental protection technologies are continuously applied in power plants, and it is also necessary to reduce environmental protection and energy consumption while achieving environmental protection effect.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a boiler exhaust heat recovery system with simple structure and high conversion efficiency, aiming at the above-mentioned defects of the prior art.

The utility model aims to solve the technical scheme that the boiler exhaust smoke heat recovery system comprises a heat recovery system body for recovering heat of boiler smoke, wherein the heat recovery system body comprises a smoke heat exchange device, a smoke inlet pipeline and a smoke exhaust pipeline, the smoke heat exchange device is vertically arranged on the ground through a support frame, the bottom of the smoke heat exchange device is communicated with the smoke inlet pipeline to introduce dedusted smoke, the side wall of the smoke heat exchange device is provided with a demineralized water inlet and a demineralized water outlet, the top of the smoke heat exchange device is communicated with the smoke exhaust pipeline to exhaust the heat-exchanged smoke, and the far end of the smoke exhaust pipeline is connected with a desulfurizing tower; and the smoke inlet pipeline and the smoke exhaust pipeline are both provided with manholes for personnel to enter for maintenance.

Furthermore, a primary heat exchanger, a secondary heat exchanger and a tertiary heat exchanger which are sequentially arranged from bottom to top are arranged in the flue gas heat exchange device, and each stage of heat exchanger is provided with a corresponding demineralized water inlet and a corresponding demineralized water outlet in a matched manner; and a funnel-shaped smoke guide port is arranged at the bottom of the smoke heat exchange device.

The control system comprises a temperature sensor, an electromagnetic valve and a control module, wherein the temperature sensor is used for detecting the temperature of the flue gas at each level of heat exchangers in the flue gas inlet pipeline and the flue gas heat exchange device, converting the temperature information into an electric signal and transmitting the electric signal to the control module, and the control module is used for controlling the opening and closing of each electromagnetic valve according to the temperature information of the temperature sensor so as to control the water inflow of each level of heat exchangers.

Further, the smoke exhaust pipeline is fixedly installed on the outer side wall of the flue gas heat exchange device through the hoop, and the far end of the smoke exhaust pipeline is connected with the desulfurizing tower through a connecting pipeline which is gradually inclined downwards from one side of the flue gas heat exchange device to one side of the desulfurizing tower.

Furthermore, the anti-abrasion fins and the guide plates are arranged on the heating surfaces of the smoke inlet pipeline and the smoke exhaust pipeline along the smoke direction.

The utility model has the beneficial technical effects that: according to the utility model, the heat of 120 ℃ in the boiler exhaust gas is converted into the boiler water supply source through the flue gas heat exchange device, the exhaust gas temperature is reduced, the boiler exhaust gas heat loss is reduced, the heat is recycled, in addition, the flue gas inlet temperature of the desulfurizing tower is reduced, and the total amount of the exhaust gas discharged moisture and the exhaust gas is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the accompanying drawings and examples.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inside", "outside", "lateral", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the boiler exhaust smoke heat recovery system comprises a heat recovery system body for recovering heat of boiler smoke, wherein the heat recovery system body comprises a smoke heat exchange device 1, a smoke inlet pipe 2 and a smoke exhaust pipeline 3, the smoke heat exchange device 1 is vertically arranged on the ground through a support frame 4, the bottom of the smoke heat exchange device 1 is communicated with the smoke inlet pipe 2 to introduce dedusted smoke, the side wall of the smoke heat exchange device 1 is provided with a demineralized water inlet and a demineralized water outlet, the top of the smoke heat exchange device 1 is communicated with the smoke exhaust pipeline 3 to exhaust heat-exchanged smoke, and the far end of the smoke exhaust pipeline 3 is connected with a desulfurizing tower 5; and the smoke inlet pipeline 2 and the smoke exhaust pipeline 3 are both provided with manholes 6 for personnel to enter for maintenance.

Referring to fig. 1, a primary heat exchanger 7, a secondary heat exchanger 8 and a tertiary heat exchanger 9 are arranged in the flue gas heat exchange device 1 from bottom to top in sequence, and each stage of heat exchanger is provided with a corresponding demineralized water inlet and a corresponding demineralized water outlet in a matching manner; the bottom of the flue gas heat exchange device 1 is provided with a funnel-shaped smoke guide opening 10. In addition, this heat recovery system body still includes the control system who is used for controlling one-level heat exchanger 7, second grade heat exchanger 8 and tertiary heat exchanger 9 inflow, control system includes temperature sensor, solenoid valve and control module, temperature sensor is used for detecting the flue gas temperature of advancing the heat exchanger department at all levels in tobacco pipe 2 and the flue gas heat transfer device 1 to convert this temperature information into the signal of telecommunication and transmit to control module, control module is used for controlling the inflow in order to control the heat exchanger at all levels according to the switching of temperature sensor's temperature information each solenoid valve. For example, after the flue gas exchanges heat through the first-stage heat exchanger and the second-stage heat exchanger, the flue gas is communicated to the third-stage heat exchanger to be insufficient for heat exchange, and the temperature sensor at the corresponding position can close the third-stage heat exchanger and a water inlet valve on the third-stage heat exchanger after detecting the information, so that the energy consumption is saved.

Referring to fig. 1, the smoke exhaust pipeline is fixedly installed on the outer side wall of the flue gas heat exchange device 1 through a hoop 11, and the far end of the smoke exhaust pipeline 3 is connected with the desulfurizing tower 5 through a connecting pipeline 12 which is gradually inclined downwards from one side of the flue gas heat exchange device to one side of the desulfurizing tower. And the heating surfaces of the smoke inlet pipeline 2 and the smoke exhaust pipeline 3 along the smoke direction are provided with anti-abrasion fins and guide plates. Practice proves that the heat efficiency of the self-use steam stripping high-boiler is reduced by 2 percent (the standard coal is saved by 5 tons/day) through the implementation of the heat recovery system body. The smoke temperature and the smoke flow rate are reduced, the emission of wet waste gas is reduced, the outlet resistance of the induced draft fan is reduced, the output power is reduced by 50KW, and the energy is saved by 1200 DEG per day.

According to the utility model, the heat of 120 ℃ in the boiler exhaust gas is converted into the boiler water supply source through the flue gas heat exchange device, the exhaust gas temperature is reduced, the boiler exhaust gas heat loss is reduced, the heat is recycled, in addition, the flue gas inlet temperature of the desulfurizing tower is reduced, and the total amount of the exhaust gas discharged moisture and the exhaust gas is reduced. Normal temperature-removing brine is utilized to transfer heat in a recovery device by using flue gas heat energy to improve the water inlet temperature of the deaerator, so that the self-consumption steam is saved; the recovery device reduces the smoke inlet temperature of the desulfurizing tower, reduces the exhaust emission, lightens the load of the induced draft fan and saves energy. The heat recovery system body is reasonably configured through equipment, pipelines and a control system, and the overall heat efficiency of the boiler is improved.

The specific embodiments described herein are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a boiler smoke heat recovery system, includes the heat recovery system body that is used for carrying out heat recovery to the boiler flue gas, its characterized in that: the heat recovery system body comprises a flue gas heat exchange device, a flue gas inlet pipeline and a flue gas exhaust pipeline, the flue gas heat exchange device is vertically arranged on the ground through a support frame, the bottom of the flue gas heat exchange device is communicated with the flue gas inlet pipeline to introduce dedusted flue gas, a demineralized water inlet and a demineralized water outlet are formed in the side wall of the flue gas heat exchange device, the top of the flue gas heat exchange device is communicated with the flue gas exhaust pipeline to exhaust the heat-exchanged flue gas, and the far end of the flue gas exhaust pipeline is connected with the desulfurizing tower; and the smoke inlet pipeline and the smoke exhaust pipeline are both provided with manholes for personnel to enter for maintenance.

2. The boiler flue gas heat recovery system of claim 1, characterized in that: a first-stage heat exchanger, a second-stage heat exchanger and a third-stage heat exchanger which are sequentially arranged from bottom to top are arranged in the flue gas heat exchange device, and each stage of heat exchanger is provided with a corresponding demineralized water inlet and a corresponding demineralized water outlet in a matched manner; and a funnel-shaped smoke guide port is arranged at the bottom of the smoke heat exchange device.

3. The boiler flue gas heat recovery system of claim 2, characterized in that: the control system comprises a temperature sensor, an electromagnetic valve and a control module, wherein the temperature sensor is used for detecting the flue gas temperature of each level of heat exchanger in the flue gas inlet pipeline and the flue gas heat exchange device and converting the temperature information into an electric signal to be transmitted to the control module, and the control module is used for controlling the opening and closing of each electromagnetic valve according to the temperature information of the temperature sensor so as to control the water inflow of each level of heat exchanger.

4. The boiler flue gas heat recovery system of claim 2 or 3, characterized in that: the smoke exhaust pipeline is fixedly installed on the outer side wall of the flue gas heat exchange device through the hoop, and the far end of the smoke exhaust pipeline is connected with the desulfurizing tower through a connecting pipeline which is gradually inclined downwards from one side of the flue gas heat exchange device to one side of the desulfurizing tower.

5. The boiler flue gas heat recovery system of claim 4, characterized in that: and the anti-abrasion fins and the guide plates are arranged on the heating surfaces of the smoke inlet pipeline and the smoke exhaust pipeline along the smoke direction.