High-efficiency energy-saving industrial waste heat recovery and utilization system

Abstract

The application provides an industrial waste heat recovery and utilization system with high efficiency and energy saving, comprising a boiler, a periodic blowdown tank connected with the boiler, a periodic blowdown expander communicated with the periodic blowdown tank through a blowdown pipe, wherein the blowdown pipe is provided with a first primary valve and a first secondary valve, a steam drum, a continuous blowdown tank communicated with the steam drum through desalted water branch pipes arranged on the left and right sides of the steam drum, a continuous blowdown expander communicated with the continuous blowdown tank through a desalted water main pipe, and a heat exchange station water supply tank communicated with the continuous blowdown expander through a heat exchange station branch pipe. The periodic blowdown expander and the continuous blowdown expander are arranged to receive waste heat water from periodic blowdown of the boiler and desalted water from continuous blowdown of the steam drum respectively, and the flow of the waste heat water and the desalted water is controlled through valves, so that more reasonable recycling and discharge can be realized, water consumption and wastewater discharge can be effectively reduced, the utilization efficiency of energy is improved, energy waste is reduced, the operation cost of enterprises is reduced, and the goal of energy saving and emission reduction is achieved.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste recycling and utilization technology, specifically to a high-efficiency and energy-saving industrial waste heat recovery and utilization system. Background Technology

[0002] In thermal power plants, boilers are the main heat-generating equipment. The wastewater generated during their operation can be divided into periodic wastewater discharge and continuous wastewater discharge, depending on the temperature.

[0003] Regular blowdown is an extremely important operation in the operation of boilers in thermal power plants. The purpose of regular blowdown is to reduce the salt and alkali content of boiler water, ensure the quality of boiler water and steam, improve steam quality, prevent scale formation on heating surfaces and inside steam pipes, and prevent the deterioration of steam and feedwater quality.

[0004] The purpose of continuous blowdown is to remove suspended solids and salts from the boiler water and maintain boiler water quality. The continuous blowdown expansion tank is connected to the continuous blowdown pipe through connecting pipes, allowing steam in the continuous blowdown pipe to overflow back to the water tank through the continuous blowdown expansion tank. The continuous blowdown expansion tank separates the steam from the water in the continuous blowdown pipe, and the separated water enters the water tank. The continuous blowdown expansion tank then discharges the steam from the continuous blowdown pipe through an induced draft fan.

[0005] The periodic and continuous wastewater discharged from boilers in thermal power plants contains a significant amount of usable heat. Failure to utilize this heat properly represents a waste of energy. The wastewater also contains various harmful substances that pollute the environment and negatively impact human health, necessitating its treatment. However, in thermal power plants, boilers operate continuously with regular blowdowns due to water quality issues. Because the discharged boiler water is at a high temperature, it needs to be cooled in the blowdown cooling well before reuse, resulting in heat loss. Utility Model Content

[0006] This utility model provides a high-efficiency and energy-saving industrial waste heat recovery and utilization system to solve the problem of low heat utilization rate of wastewater discharge.

[0007] To address the aforementioned problems, this utility model provides a high-efficiency and energy-saving industrial waste heat recovery and utilization system, comprising: a boiler; a periodic sludge discharge tank connected to the boiler; a periodic sludge discharge expansion tank connected to the periodic sludge discharge tank via a sludge discharge pipe; a steam heating system connected to a steam heating system branch pipe via the periodic sludge discharge expansion tank; the sludge discharge pipe is equipped with a first-stage valve and a first-secondary valve; a steam drum; a continuous sludge discharge tank connected to the steam drum via demineralized water branch pipes arranged on both sides of the steam drum, wherein each of the two demineralized water branch pipes is equipped with a second-stage valve and a second-secondary valve; a continuous sludge discharge expansion tank connected to the continuous sludge discharge tank via a demineralized water main pipe, wherein the demineralized water main pipe is equipped with a third-stage valve and a third-secondary valve; and a heat exchange station makeup water tank connected to the continuous sludge discharge expansion tank via a heat exchange station branch pipe.

[0008] The above scheme involves setting up a periodic blowdown expansion tank and a continuous blowdown expansion tank. The periodic blowdown expansion tank is dedicated to receiving waste hot water from the boiler's periodic blowdown tank. It is connected via a wastewater pipe and equipped with dual valves to control the flow of hot water. The dual valves ensure the safety of the blowdown operation and prevent accidental leaks and short circuits. The continuous blowdown expansion tank receives demineralized water from the boiler drum's continuous blowdown tank. It has a demineralized water branch pipe on each side, and dual valves control the flow of hot water into the demineralized water main pipe. The hot water then connects to the continuous blowdown expansion tank via dual valves, ultimately transferring the heat energy to the heat exchange station's makeup water tank for plant-wide heating in winter. This solves the problem of low heat utilization rate of wastewater in existing technologies.

[0009] According to one embodiment of the present invention, the aforementioned continuous sewage discharge tank is also connected to the periodic sewage discharge expansion tank through a fourth primary valve and a fourth secondary valve installed on the branch of the demineralized water main pipe. By installing a secondary valve on the demineralized water main pipe, the demineralized water is directed to the periodic sewage discharge expansion tank, thereby further improving the efficiency of industrial waste heat recovery and utilization.

[0010] According to one embodiment of this utility model, it also includes: a urea storage tank connected to a branch pipe of a urea storage tank via a continuous sewage expansion container. By setting up a urea storage tank, the dissolution of urea is accelerated, and environmental parameters are well controlled. At the same time, the amount of demineralized water used can be reduced, saving costs and increasing economic benefits.

[0011] According to one embodiment of this utility model, all of the above-mentioned branch pipes are equipped with electric valves. By setting electric valves, the system can be automatically opened and closed according to the system needs, which improves the intelligence level of the system, facilitates remote control and monitoring, and improves the efficiency of heat utilization.

[0012] According to one embodiment of the present invention, the system further includes a flow control system for controlling the flow rate of waste hot water in each pipe. Through the flow control system, the flow rate of waste hot water in each pipe can be precisely controlled, ensuring sewage discharge efficiency and system stability.

[0013] According to one embodiment of this utility model, the above-mentioned heat exchange station makeup water tank is also connected to the continuous sewage tank through a demineralized water main pipe equipped with a fourth primary valve and a fourth secondary valve. The above scheme directly introduces demineralized water into the makeup water tank, reducing pipeline connections and system complexity, and lowering operation and maintenance costs.

[0014] The technical advantages of this application are as follows:

[0015] (1) This application provides an efficient and energy-saving industrial waste heat recovery and utilization system. By setting up a periodic sewage discharge expansion tank and a continuous sewage discharge expansion tank, the system receives waste hot water from the boiler periodic sewage discharge tank and demineralized water from the steam drum continuous sewage discharge tank, respectively. The flow is controlled by valves, which can achieve more reasonable recycling and discharge, effectively reduce water consumption and wastewater discharge, improve energy utilization efficiency, reduce energy waste, and reduce the operating costs of enterprises, thus achieving the goal of energy conservation and emission reduction.

[0016] (2) In practical applications, the heat from waste hot water and demineralized water is reused for urea dissolution, steam heating and heat exchange station water supply tank, which significantly improves the overall thermal efficiency of the system. At the same time, through precise control of temperature and flow, the stable operation of each link is ensured, the ambient temperature of the garbage unloading hall is increased, and the working environment is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the high-efficiency and energy-saving industrial waste heat recovery and utilization system provided by this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Boiler; 2. Periodic blowdown tank; 301. Primary valve; 401. Primary and secondary valves; 302. Secondary valve; 402. Secondary and tertiary valves; 303. Tertiary valve; 403. Tertiary and tertiary valves; 304. Primary valve; 404. Secondary and tertiary valves; 5. Sewage pipe; 6. Steam drum; 7. Demineralized water branch pipe; 8. Continuous blowdown tank; 9. Demineralized water main pipe; 10. Continuous blowdown expansion tank; 11. Urea storage tank branch pipe; 12. Urea storage tank; 13. Heat exchange station branch pipe; 14. Heat exchange station makeup water tank; 15. Periodic blowdown expansion tank; 16. Steam heating system branch pipe; 17. Electric valve; 18. Steam heating system. Detailed Implementation

[0020] The following will be combined with the appendix Figure 1 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples and should not be used to limit the scope of protection of this application.

[0021] Example 1

[0022] See attached document Figure 1 This utility model provides a high-efficiency and energy-saving industrial waste heat recovery and utilization system, including: a boiler 1; a periodic sewage tank 2 connected to the boiler 1, and a steam heating system 18 connected to a steam heating system branch pipe 16 via a periodic sewage expansion container 15; a periodic sewage expansion container 15 connected to the periodic sewage tank 2 via a sewage pipe 5; the sewage pipe 5 is equipped with a first-stage valve 301 and a first-secondary valve 401; a steam drum 6; a continuous sewage tank 8 connected to the steam drum 6 via two rows of demineralized water branch pipes 7 arranged on the left and right sides of the steam drum 6, wherein each of the two rows of demineralized water branch pipes 7 is respectively equipped with a second-stage valve 302 and a second-secondary valve 402; a continuous sewage expansion container 10 connected to the continuous sewage tank 8 via a demineralized water main pipe 9, wherein the demineralized water main pipe 9 is equipped with a third-stage valve 303 and a third-secondary valve 403; and a heat exchange station makeup water tank 14 connected to the continuous sewage expansion container 10 via a heat exchange station branch pipe 13.

[0023] The periodic wastewater from boiler 1 flows into periodic wastewater tank 2. The secondary valve is opened, and the periodic wastewater expansion container 15 connected to periodic wastewater tank 2 discharges the periodic wastewater into steam heating system 18 through steam heating system branch pipe 16. By setting up steam heating system 18, the ambient temperature of the garbage unloading hall is increased, ensuring that the garbage can be fully fermented, ensuring stable combustion of boiler 1, increasing the calorific value of garbage, and reducing the amount of fuel oil used by boiler 1, thereby saving energy and reducing environmental pollution.

[0024] The demineralized water discharged from the steam drum 6 enters the continuous blowdown tank 9 through the demineralized water branch pipe 7. The secondary valve is opened, and the continuous blowdown expansion tank 10 connected to the continuous blowdown tank 9 discharges the demineralized water into the heat exchange station makeup water tank through the heat exchange station branch pipe 13. By setting up the heat exchange station makeup water tank 14, heat is recovered and transferred for heating of the whole plant, reducing the demand for additional energy and improving the overall heat utilization rate.

[0025] The above scheme involves setting up a steam heating system 18 and a heat exchange station water supply tank 14, with the sewage expansion tank working simultaneously to utilize all the heat. This allows for heating of the entire plant during winter, increasing the ambient temperature, reducing the need for additional energy, and solving the problem of low heat utilization rate of sewage.

[0026] The aforementioned continuous sewage tank 8 is also connected to the periodic sewage expansion container 15 through a fourth primary valve 304 and a fourth secondary valve 404 installed on a branch of the demineralized water main pipe 9. By installing double valves on the demineralized water main pipe 9, the demineralized water is directed to the periodic sewage expansion container 15, further improving the efficiency of industrial waste heat recovery and utilization.

[0027] The aforementioned heat recovery and utilization system also includes a urea storage tank 12 connected to the urea storage tank branch pipe 11 via a continuous sewage expansion container 10. By setting up the urea storage tank 12, the dissolution of urea is accelerated, and environmental parameters are well controlled. At the same time, the amount of demineralized water used can be reduced, saving costs and increasing economic benefits.

[0028] All of the above-mentioned branch pipes are equipped with electric valves 17. By setting electric valves 17, the system can be automatically opened and closed according to the system needs, which improves the intelligence level of the system, facilitates remote control and monitoring, and improves the efficiency of heat utilization.

[0029] The aforementioned heat recovery and utilization system also includes a flow control system for controlling the flow of waste hot water in each pipe. Through the flow control system, the flow of waste hot water in each pipe can be precisely controlled, ensuring sewage discharge efficiency and system stability.

[0030] The aforementioned heat exchange station makeup water tank 14 is also connected to the continuous sewage tank 8 via a demineralized water main pipe 9 equipped with a fourth primary valve 304 and a fourth secondary valve 404. This scheme allows demineralized water to be directly introduced into the makeup water tank, reducing pipeline connections and system complexity, and lowering operation and maintenance costs.

[0031] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A high-efficiency and energy-saving industrial waste heat recovery and utilization system, characterized in that, include: Boiler (1); periodic sludge tank (2) connected to boiler (1); periodic sludge expansion container (15) connected to periodic sludge tank (2) via sludge pipe (5); steam heating system (18) connected to steam heating system branch pipe (16) via the periodic sludge expansion container (15); the sludge pipe (5) is equipped with a first-stage valve (301) and a first-second-stage valve (401); Steam drum (6); a continuous sludge tank (8) connected to the steam drum (6) via two rows of demineralized water branch pipes (7) on the left and right sides of the steam drum (6), wherein each row of demineralized water branch pipes (7) is equipped with a second-level valve (302) and a second-level valve (402); a continuous sludge expansion tank (10) connected to the continuous sludge tank (8) via a demineralized water main pipe (9), wherein the demineralized water main pipe (9) is equipped with a third-level valve (303) and a third-level valve (403); and a heat exchange station makeup water tank (14) connected to the continuous sludge expansion tank (10) via a heat exchange station branch pipe (13).

2. The high-efficiency and energy-saving industrial waste heat recovery and utilization system according to claim 1, characterized in that, The continuous sewage tank (8) is also connected to the periodic sewage expansion tank (15) through a fourth primary valve (304) and a fourth secondary valve (404) installed on a branch of the demineralized water main pipe (9).

3. The high-efficiency and energy-saving industrial waste heat recovery and utilization system according to claim 1, characterized in that, Also includes: The urea storage tank (12) is connected to the urea storage tank branch pipe (11) via the continuous sewage expansion container (10).

4. The high-efficiency and energy-saving industrial waste heat recovery and utilization system according to any one of claims 1, 2, or 3, characterized in that, All branch pipes are equipped with electric valves (17).

5. The high-efficiency and energy-saving industrial waste heat recovery and utilization system according to claim 1, characterized in that, It also includes a flow control system for controlling the flow of waste hot water in each pipe.

6. The high-efficiency and energy-saving industrial waste heat recovery and utilization system according to claim 1, characterized in that, The heat exchange station water supply tank (14) is also connected to the continuous sewage tank (8) through the demineralized water main pipe (9) which is equipped with a fourth primary valve (304) and a fourth secondary valve (404).

Images