Water cooling-air cooling heat exchanger system for cement plant
By introducing a water-cooled-air-cooled heat exchanger system into the cement plant, the problem of high power consumption of heat exchangers in cement production has been solved, waste heat recovery and hot water supply have been realized, and energy utilization efficiency has been improved.
Patent Information
- Application Number
- CN202511370833.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2025-11-21
AI Technical Summary
Energy waste exists in the cement production process, especially the high electricity consumption of heat exchangers. Furthermore, existing air-cooled heat exchangers are bulky, leading to excessive electricity consumption.
The system adopts a water-cooled-air-cooled heat exchanger system. The flue gas first passes through the water-cooled section and then enters the air-cooled section. The water-cooled section is put into operation and shut down through the bypass flue gas duct. The water supplied by the water supply system absorbs the heat of the flue gas and turns into hot water for production or domestic use.
It reduced the power consumption of the heat exchanger, increased the power generation from waste heat, and provided a large amount of hot water for the production and living needs of the cement plant.
Smart Images
Figure CN120991603A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of waste heat recovery technology in cement plants, and more specifically to the field of a water-cooled-air-cooled heat exchanger system for cement plants. Background Technology
[0002] Cement production processes consume large amounts of fossil fuels and electricity. At the same time, there is a significant amount of energy waste in cement production systems. In order to reduce energy consumption and solve the problem of electricity supply, how to better recover and utilize the heat wasted in the cement production firing system remains a major concern.
[0003] Currently, most cement plants in China are equipped with waste heat power generation systems, with the outlet temperature of the waste heat boiler at the kiln head around 95-110℃. Cement plant clinker lines typically use electrostatic precipitators or bag filters at the kiln head. Generally, a heat exchanger is installed at the grate cooler outlet and before the dust collector to prevent excessively high flue gas temperatures entering the dust collector when the waste heat boiler at the kiln head is shut down or when the grate cooler is operating abnormally.
[0004] Heat exchangers are typically air-cooled, using an axial fan to blow air into the heat exchanger to cool the flue gas inside the heat exchange pipes, ensuring the flue gas temperature meets the operating requirements of the dust collector. However, air-cooled heat exchangers are bulky, and the axial fan consumes a significant amount of electricity. Summary of the Invention
[0005] The purpose of this invention is to solve the above-mentioned technical problems by providing a water-cooled / air-cooled heat exchanger system for cement plants. It is suitable for cement plants of various sizes, cement plants equipped with waste heat power generation systems, cement plants with heating needs, or cement plants requiring hot water supply for daily life.
[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: This invention provides a water-cooled-air-cooled heat exchanger system for a cement plant, including a kiln head grate cooler, a waste heat power generation AQC boiler, a dust removal system, a water supply system, and a water-cooled-air-cooled composite heat exchanger. The water-cooled and air-cooled heat exchanger includes an exchanger housing, a flue gas inlet located at the top of the exchanger housing, a flue gas outlet located at the bottom of the side wall of the exchanger housing, a water-cooled section located at the upper part of the exchanger housing, and an air-cooled section located at the lower part of the exchanger housing. The flue gas outlets of the grate cooler and the waste heat power generation AQC boiler are collected into the main flue gas outlet pipe through pipelines. The main flue gas outlet pipe is connected to the flue gas inlet of the water-cooled air-cooled heat exchanger. The flue gas outlet of the water-cooled air-cooled heat exchanger is connected to the dust removal system through connecting pipelines. The outlet of the dust removal system is connected to the induced draft fan and the chimney in sequence. The outlet of the water supply system is connected to the cold water inlet of the water-cooled section, and the hot water outlet of the water-cooled section is connected to the plant hot water supply system, the plant heating system, or the economizer of the AQC boiler.
[0007] Specifically, the flue gas first passes through the water-cooled section of the water-cooled air-cooled heat exchanger before entering the air-cooled section. The water-cooled section can be put into and taken out of service via a bypass flue gas duct. The treated water is fed into the water-cooled air-cooled heat exchanger by the water supply system, where it absorbs heat from the flue gas and becomes hot water, supplying the cement plant with daily production and domestic water. Based on the production and living characteristics of the cement plant, a higher feedwater temperature in the waste heat power generation system can increase power generation; daily life requires a large amount of hot water for bathing or heating, etc.
[0008] The capacity of the water-cooled and air-cooled sections of the water-cooled and air-cooled heat exchanger needs to be comprehensively considered based on the clinker production line output, hot water consumption, and dust collector operating temperature.
[0009] In one embodiment, the water supply system includes a water source, a deaerator connected to the water source, a water supply pipeline connected to the outlet of the deaerator, and a water supply pump installed on the water supply pipeline. The water supply pipeline is connected to the cold water inlet of the water-cooled section.
[0010] Specifically, the feedwater system is arranged as follows: deaerator → feedwater pump → water-cooled air-cooled composite heat exchanger → boiler economizer. That is, after the boiler feedwater is sent into the heat exchange tube bundle in the water-cooled air-cooled composite heat exchanger, it exchanges heat with the hot flue gas entering the heat exchanger, increasing the feedwater temperature and thus increasing the amount of waste heat generated for power generation.
[0011] In one embodiment, the water supply system includes a water treatment system, a water tank connected to the water treatment system, a water supply pipe connected to the outlet of the water tank, and a water supply pump installed on the water supply pipe. The water supply pipe is connected to the cold water inlet of the water-cooled section, the water outlet of the water-cooled section is connected to the plant hot water supply system, and the plant hot water supply system is connected to the heating unit.
[0012] Specifically, the water supply system is arranged as follows: water treatment system → water supply pump → water-cooled air-cooled heat exchanger → plant heating system → heating units. That is, the treated water is pumped to the heat exchange tube bundle of the water-cooled air-cooled heat exchanger, where it exchanges heat with the hot flue gas entering the heat exchanger, increasing the water temperature before being supplied to the plant heating system for each heating unit.
[0013] In one embodiment, the water supply system includes a water treatment system, a water tank connected to the water treatment system, a water supply pipe connected to the outlet of the water tank, and a water supply pump installed on the water supply pipe. The water supply pipe is connected to the cold water inlet of the water-cooled section, the water outlet of the water-cooled section is connected to the plant heating system, and the plant heating system is connected to the hot water use unit.
[0014] Specifically, the water supply system is arranged as follows: water treatment system → feedwater pump → water-cooled air-cooled heat exchanger → plant hot water supply system → hot water usage units. That is, the treated water is pumped to the heat exchange tube bundle of the water-cooled air-cooled heat exchanger, where it exchanges heat with the hot flue gas entering the heat exchanger, increasing the water temperature before being supplied to the plant hot water system for each hot water usage unit.
[0015] In one embodiment, the dust removal system includes a dust collector, a chimney connected to the outlet of the dust collector, and an induced draft fan installed on the connecting pipe between the dust collector and the chimney.
[0016] Specifically, the flue gas from the grate cooler outlet and the flue gas from the waste heat power generation AQC boiler outlet merge and enter the water-cooled air-cooled heat exchanger. After the flue gas is cooled down, it enters the cyclone dust collector and dust collector in sequence. The flue gas after dust collection is discharged into the atmosphere through the induced draft fan into the chimney.
[0017] In one implementation, the dust collector is a bag filter.
[0018] In one embodiment, the system further includes a cyclone dust collector, wherein the air inlet of the dust collector is connected to the air outlet of the cyclone dust collector, and the air inlet of the cyclone dust collector is connected to the flue gas outlet.
[0019] In one embodiment, a dust collection system is also included, comprising a first dust collection conveying line located at the bottom of the dust collector, a second dust collection conveying line located at the bottom of the cyclone dust collector and the water-cooled air-cooled heat exchanger, and a third dust collection conveying line located at the dust outlet of the kiln head grate cooler.
[0020] In one embodiment, the heights of the first dust collection conveyor line, the second dust collection conveyor line, and the third dust collection conveyor line are reduced one by one. The output end of the first dust collection conveyor line is located on the second dust collection conveyor line, the output end of the second dust collection conveyor line is located above the third dust collection conveyor line, and the output end of the third dust collection conveyor line is connected to a dust collection bin.
[0021] In one embodiment, the water-cooled section includes a serpentine heat exchange tube located inside the heat exchanger housing, with one end of the serpentine heat exchange tube connected to a cold water inlet and the other end connected to a cold water outlet.
[0022] The beneficial effects of this invention are as follows: 1. To recover heat energy from the flue gas entering the dust collector, a water-cooled and air-cooled combined heat exchanger can be selected. This water-cooled and air-cooled heat exchanger can meet the operating requirements of the flue gas entering the dust collector, while the recovered heat energy can be supplied to production and daily life. Compared with a pure air-cooled heat exchanger, the water-cooled and air-cooled heat exchanger reduces the power consumption of the heat exchanger.
[0023] 2. The flue gas first passes through the water-cooled section of the water-cooled air-cooled heat exchanger before entering the air-cooled section. The water-cooled section can be put into and taken out of operation via a bypass flue gas duct. The treated water is sent to the water-cooled air-cooled heat exchanger from the feedwater system, where it absorbs heat from the flue gas and becomes hot water, supplying the cement plant with daily production or domestic water. Based on the production and living characteristics of the cement plant, a higher feedwater temperature in the waste heat power generation system can increase power generation; daily life requires a large amount of hot water for bathing or heating, etc.
[0024] 3. The capacity of the water-cooled and air-cooled sections of the water-cooled and air-cooled heat exchanger should be determined by comprehensively considering the clinker production line output, hot water consumption, and dust collector operating temperature. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Attached reference numerals: 1. Kiln head grate cooler; 2. Waste heat power generation AQC boiler; 3. Water-cooled air-cooled heat exchanger; 4. Third dust collection conveyor line; 5. Second dust collection conveyor line; 6. First dust collection conveyor line; 7. Dust collection bin; 8. Dust collector; 9. Feed water pump; 10. Water tank; 11. Water treatment system; 12. Deaerator. Detailed Implementation
[0027] To make the technical problems, technical solutions, and technical effects of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0029] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0030] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.
[0031] Example 1 like Figure 1 As shown, this embodiment provides a water-cooled-air-cooled heat exchanger system for a cement plant, including a kiln head grate cooler 1, a waste heat power generation AQC boiler 2, a dust removal system, a water supply system, and a water-cooled-air-cooled heat exchanger 3. The water-cooled and air-cooled heat exchanger 3 includes an exchanger housing, a flue gas inlet located at the top of the exchanger housing, a flue gas outlet located at the bottom of the side wall of the exchanger housing, a water-cooled section located at the upper end of the exchanger housing, and an air-cooled section located at the lower end of the exchanger housing. The flue gas outlets of the grate cooler and the waste heat power generation AQC boiler 2 are collected into the main flue gas outlet pipe through pipelines. The main flue gas outlet pipe is connected to the flue gas inlet of the water-cooled air-cooled heat exchanger 3. The flue gas outlet of the water-cooled air-cooled heat exchanger 3 is connected to the dust removal system through connecting pipelines. The outlet of the dust removal system is connected to the induced draft fan and the chimney in sequence. The water outlet of the water supply system is connected to the cold water inlet of the water-cooled section, and the hot water outlet of the water-cooled section is connected to the plant hot water supply system, the plant heating system, or the AQC boiler economizer.
[0032] Specifically, the flue gas first passes through the water-cooled section of the water-cooled air-cooled heat exchanger 3, and then enters the air-cooled section; the water-cooled section can be put into operation and shut down through a bypass flue gas duct. The treated water is sent to the water-cooled air-cooled heat exchanger 3 from the water supply system, where it absorbs heat from the flue gas and becomes hot water, supplying the cement plant with daily production or domestic water. Based on the production and living characteristics of the cement plant, a higher feedwater temperature in the waste heat power generation system can increase power generation; daily life requires a large amount of hot water for bathing or heating, etc.
[0033] The capacity of the water-cooled and air-cooled sections of the water-cooled and air-cooled heat exchanger 3 needs to be comprehensively considered based on the clinker production line output, hot water consumption, and the operating temperature of the dust collector 8.
[0034] Example 1 like Figure 1 As shown, this embodiment provides a water-cooled-air-cooled heat exchanger system for a cement plant, including a kiln head grate cooler 1, a waste heat power generation AQC boiler 2, a dust removal system, a water supply system, and a water-cooled-air-cooled heat exchanger 3. The water-cooled and air-cooled heat exchanger 3 includes an exchanger housing, a flue gas inlet located at the top of the exchanger housing, a flue gas outlet located at the bottom of the side wall of the exchanger housing, a water-cooled section located at the upper end of the exchanger housing, and an air-cooled section located at the lower end of the exchanger housing. The flue gas outlets of the grate cooler and the waste heat power generation AQC boiler 2 are collected into the main flue gas outlet pipe through pipelines. The main flue gas outlet pipe is connected to the flue gas inlet of the water-cooled air-cooled heat exchanger 3. The flue gas outlet of the water-cooled air-cooled heat exchanger 3 is connected to the dust removal system through connecting pipelines. The outlet of the dust removal system is connected to the induced draft fan and the chimney in sequence. The outlet of the water supply system is connected to the cold water inlet of the water-cooled section, and the hot water outlet of the water-cooled section is connected to the plant hot water supply system, the plant heating system, or the economizer of the AQC boiler.
[0035] Specifically, the flue gas first passes through the water-cooled section of the water-cooled air-cooled heat exchanger 3, and then enters the air-cooled section; the water-cooled section can be put into operation and shut down through a bypass flue gas duct. The treated water is sent to the water-cooled air-cooled heat exchanger 3 from the water supply system, where it absorbs heat from the flue gas and becomes hot water, supplying the cement plant with daily production or domestic water. Based on the production and living characteristics of the cement plant, a higher feedwater temperature in the waste heat power generation system can increase power generation; daily life requires a large amount of hot water for bathing or heating, etc.
[0036] The capacity of the water-cooled and air-cooled sections of the water-cooled and air-cooled heat exchanger 3 needs to be comprehensively considered based on the clinker production line output, hot water consumption, and the operating temperature of the dust collector 8.
[0037] The water supply system includes a water treatment system 11, a water tank 10 connected to the water treatment system 11, a water supply pipe connected to the outlet of the water tank 10, and a water supply pump 9 installed on the water supply pipe. The water supply pipe is connected to the cold water inlet of the water-cooled section, the water outlet of the water-cooled section is connected to the plant hot water supply system, and the plant hot water supply system is connected to the heating unit.
[0038] The dust removal system includes a dust collector 8 and a chimney connected to the outlet of the dust collector 8. An induced draft fan is installed on the connecting pipe between the dust collector 8 and the chimney. The dust collector 8 is a bag filter. It also includes a cyclone dust collector, with the inlet of the dust collector 8 connected to the outlet of the cyclone dust collector, and the inlet of the cyclone dust collector connected to the flue gas outlet.
[0039] Specifically, the flue gas from the grate cooler outlet and the flue gas from the waste heat power generation AQC boiler 2 merge and enter the water-cooled air-cooled heat exchanger. After cooling, the flue gas sequentially enters the cyclone dust collector and the dust collector 8. The collected flue gas is then discharged into the atmosphere through the chimney by the induced draft fan. The system also includes a dust collection system, comprising a first dust collection conveying line 6 located at the bottom of the dust collector 8, a second dust collection conveying line 5 located at the bottom of the cyclone dust collector and the water-cooled air-cooled heat exchanger 3, and a third dust collection conveying line 4 located at the dust outlet of the kiln head grate cooler 1.
[0040] The heights of the first dust collection conveyor line 6, the second dust collection conveyor line 5, and the third dust collection conveyor line 4 decrease in sequence. The output end of the first dust collection conveyor line 6 is located on the second dust collection conveyor line 5, the output end of the second dust collection conveyor line 5 is located above the third dust collection conveyor line 4, and the output end of the third dust collection conveyor line 4 is connected to a dust collection bin 7.
[0041] The water-cooled section includes a serpentine heat exchange tube located inside the heat exchanger housing. One end of the serpentine heat exchange tube is connected to the cold water inlet, and the other end is connected to the cold water outlet.
[0042] Specifically, the water supply system is arranged as follows: water treatment system 11 → water supply pump 9 → water-cooled air-cooled heat exchanger → plant heating system → heating units. That is, the treated water is pumped by water supply pump 9 to the heat exchange tube bundle of the water-cooled air-cooled heat exchanger 3, where it exchanges heat with the hot flue gas entering the water-cooled air-cooled heat exchanger 3, raising the water temperature before being supplied to the plant heating system for each heating unit.
[0043] Example 2 like Figure 2 As shown, this embodiment provides a water-cooled-air-cooled heat exchanger system for a cement plant, including a kiln head grate cooler 1, a waste heat power generation AQC boiler 2, a dust removal system, a water supply system, and a water-cooled-air-cooled heat exchanger 3. The water-cooled and air-cooled heat exchanger 3 includes an exchanger housing, a flue gas inlet located at the top of the exchanger housing, a flue gas outlet located at the bottom of the side wall of the exchanger housing, a water-cooled section located at the upper end of the exchanger housing, and an air-cooled section located at the lower end of the exchanger housing. The flue gas outlets of the grate cooler and the waste heat power generation AQC boiler 2 are collected into the main flue gas outlet pipe through pipelines. The main flue gas outlet pipe is connected to the flue gas inlet of the water-cooled air-cooled heat exchanger 3. The flue gas outlet of the water-cooled air-cooled heat exchanger 3 is connected to the dust removal system through connecting pipelines. The outlet of the dust removal system is connected to the induced draft fan and the chimney in sequence. The water outlet of the water supply system is connected to the cold water inlet of the water-cooled section, and the hot water outlet of the water-cooled section is connected to the plant hot water supply system, the plant heating system, or the AQC boiler economizer.
[0044] Specifically, the flue gas first passes through the water-cooled section of the water-cooled air-cooled heat exchanger 3, and then enters the air-cooled section; the water-cooled section can be put into operation and shut down through a bypass flue gas duct. The treated water is sent to the water-cooled air-cooled heat exchanger 3 from the water supply system, where it absorbs heat from the flue gas and becomes hot water, supplying the cement plant with daily production or domestic water. Based on the production and living characteristics of the cement plant, a higher feedwater temperature in the waste heat power generation system can increase power generation; daily life requires a large amount of hot water for bathing or heating, etc.
[0045] The capacity of the water-cooled and air-cooled sections of the water-cooled and air-cooled heat exchanger 3 needs to be comprehensively considered based on the clinker production line output, hot water consumption, and the operating temperature of the dust collector 8.
[0046] The water supply system includes a water treatment system 11, a water tank 10 connected to the water treatment system 11, a water supply pipe connected to the outlet of the water tank 10, and a water supply pump 9 installed on the water supply pipe. The water supply pipe is connected to the cold water inlet of the water-cooled section, the water outlet of the water-cooled section is connected to the plant hot water supply system, and the plant hot water supply system is connected to the heating unit.
[0047] The dust removal system includes a dust collector 8 and a chimney connected to the outlet of the dust collector 8. An induced draft fan is installed on the connecting pipe between the dust collector 8 and the chimney. The dust collector 8 is a bag filter. It also includes a cyclone dust collector, with the inlet of the dust collector 8 connected to the outlet of the cyclone dust collector, and the inlet of the cyclone dust collector connected to the flue gas outlet.
[0048] Specifically, the flue gas from the grate cooler outlet and the flue gas from the waste heat power generation AQC boiler 2 merge and enter the water-cooled air-cooled heat exchanger. After cooling, the flue gas sequentially enters the cyclone dust collector and the dust collector 8. The collected flue gas is then discharged into the atmosphere through the chimney by the induced draft fan. The system also includes a dust collection system, comprising a first dust collection conveying line 6 located at the bottom of the dust collector 8, a second dust collection conveying line 5 located at the bottom of the cyclone dust collector and the water-cooled air-cooled heat exchanger 3, and a third dust collection conveying line 4 located at the dust outlet of the kiln head grate cooler 1.
[0049] The heights of the first dust collection conveyor line 6, the second dust collection conveyor line 5, and the third dust collection conveyor line 4 decrease in sequence. The output end of the first dust collection conveyor line 6 is located on the second dust collection conveyor line 5, the output end of the second dust collection conveyor line 5 is located above the third dust collection conveyor line 4, and the output end of the third dust collection conveyor line 4 is connected to a dust collection bin 7.
[0050] The water supply system includes a water treatment system 11, a water tank 10 connected to the water treatment system 11, a water supply pipe connected to the outlet of the water tank 10, and a water supply pump 9 installed on the water supply pipe. The water supply pipe is connected to the cold water inlet of the water-cooled section, the water outlet of the water-cooled section is connected to the plant heating system, and the plant heating system is connected to the hot water use unit.
[0051] Specifically, the water supply system is arranged as follows: water treatment system 11 → water supply pump 9 → water-cooled air-cooled heat exchanger → plant hot water supply system → hot water usage unit. That is, the treated water is pumped by water supply pump 9 to the heat exchange tube bundle of the water-cooled air-cooled heat exchanger, where it exchanges heat with the hot flue gas entering the heat exchanger, raising the water temperature before being supplied to the plant hot water system for each hot water usage unit.
[0052] Example 3 like Figure 3 As shown, this embodiment provides a water-cooled-air-cooled heat exchanger system for a cement plant, including a kiln head grate cooler 1, a waste heat power generation AQC boiler 2, a dust removal system, a water supply system, and a water-cooled-air-cooled heat exchanger 3. The water-cooled and air-cooled heat exchanger 3 includes an exchanger housing, a flue gas inlet located at the top of the exchanger housing, a flue gas outlet located at the bottom of the side wall of the exchanger housing, a water-cooled section located at the upper end of the exchanger housing, and an air-cooled section located at the lower end of the exchanger housing. The flue gas outlets of the grate cooler and the waste heat power generation AQC boiler 2 are collected into the main flue gas outlet pipe through pipelines. The main flue gas outlet pipe is connected to the flue gas inlet of the water-cooled air-cooled heat exchanger 3. The flue gas outlet of the water-cooled air-cooled heat exchanger 3 is connected to the dust removal system through connecting pipelines. The outlet of the dust removal system is connected to the induced draft fan and the chimney in sequence. The water outlet of the water supply system is connected to the cold water inlet of the water-cooled section, and the hot water outlet of the water-cooled section is connected to the plant hot water supply system, the plant heating system, or the AQC boiler economizer.
[0053] Specifically, the flue gas first passes through the water-cooled section of the water-cooled air-cooled heat exchanger 3, and then enters the air-cooled section; the water-cooled section can be put into operation and shut down through a bypass flue gas duct. The treated water is sent to the water-cooled air-cooled heat exchanger 3 from the water supply system, where it absorbs heat from the flue gas and becomes hot water, supplying the cement plant with daily production or domestic water. Based on the production and living characteristics of the cement plant, a higher feedwater temperature in the waste heat power generation system can increase power generation; daily life requires a large amount of hot water for bathing or heating, etc.
[0054] The capacity of the water-cooled and air-cooled sections of the water-cooled and air-cooled heat exchanger 3 needs to be comprehensively considered based on the clinker production line output, hot water consumption, and the operating temperature of the dust collector 8.
[0055] The water supply system includes a water treatment system 11, a water tank 10 connected to the water treatment system 11, a water supply pipe connected to the outlet of the water tank 10, and a water supply pump 9 installed on the water supply pipe. The water supply pipe is connected to the cold water inlet of the water-cooled section, the water outlet of the water-cooled section is connected to the plant hot water supply system, and the plant hot water supply system is connected to the heating unit.
[0056] The dust removal system includes a dust collector 8 and a chimney connected to the outlet of the dust collector 8. An induced draft fan is installed on the connecting pipe between the dust collector 8 and the chimney. The dust collector 8 is a bag filter. It also includes a cyclone dust collector, with the inlet of the dust collector 8 connected to the outlet of the cyclone dust collector, and the inlet of the cyclone dust collector connected to the flue gas outlet.
[0057] Specifically, the flue gas from the grate cooler outlet and the flue gas from the waste heat power generation AQC boiler 2 merge and enter the water-cooled air-cooled heat exchanger. After cooling, the flue gas sequentially enters the cyclone dust collector and the dust collector 8. The collected flue gas is then discharged into the atmosphere through the chimney by the induced draft fan. The system also includes a dust collection system, comprising a first dust collection conveying line 6 located at the bottom of the dust collector 8, a second dust collection conveying line 5 located at the bottom of the cyclone dust collector and the water-cooled air-cooled heat exchanger 3, and a third dust collection conveying line 4 located at the dust outlet of the kiln head grate cooler 1.
[0058] The heights of the first dust collection conveyor line 6, the second dust collection conveyor line 5, and the third dust collection conveyor line 4 decrease in sequence. The output end of the first dust collection conveyor line 6 is located on the second dust collection conveyor line 5, the output end of the second dust collection conveyor line 5 is located above the third dust collection conveyor line 4, and the output end of the third dust collection conveyor line 4 is connected to a dust collection bin 7.
[0059] The water supply system includes a water source, a deaerator 12 connected to the water source, a water supply pipeline connected to the outlet of the deaerator 12, and a boiler feed pump 9 installed on the water supply pipeline. The water supply pipeline is connected to the cold water inlet of the water-cooled section.
[0060] Specifically, the feedwater system is arranged as follows: Deaerator 12 → Boiler Feedwater Pump 9 → Water-cooled and Air-cooled Composite Heat Exchanger → Boiler Economizer. That is, after the boiler feedwater is sent into the heat exchange tube bundle of the water-cooled and air-cooled composite heat exchanger, it exchanges heat with the hot flue gas entering the heat exchanger, increasing the feedwater temperature and thus increasing the amount of waste heat generated for power generation.
Claims
1. A cement plant water-to-air heat exchanger system, characterized by, The kiln head grate cooler (1), the waste heat power generation AQC boiler (2), a dust removal system, a water supply system and a water-cooling and air-cooling heat composite exchanger (3) are included. The water-cooling and air-cooling heat composite exchanger (3) includes an exchanger shell, a smoke inlet arranged at the top of the exchanger shell, a flue gas outlet arranged at the bottom of the sidewall of the exchanger shell, a water-cooling part arranged at the upper end of the exchanger shell and an air-cooling part arranged at the lower end of the exchanger shell. The flue gas outlet of the grate cooler and the flue gas outlet of the waste heat power generation AQC boiler (2) are connected to a main flue gas outlet pipeline through a pipeline, the main flue gas outlet pipeline is communicated with the flue gas inlet of the water-cooling and air-cooling heat composite exchanger (3), the flue gas outlet of the water-cooling and air-cooling heat composite exchanger (3) is communicated with the dust removal system through a connecting pipeline, and the outlet of the dust removal system is connected with an induced draft fan and a chimney in sequence. The water outlet of the water supply system is communicated with the cold water inlet of the water-cooling part, and the hot water outlet of the water-cooling part is communicated with a hot water supply system, a heating system or a coal economizer of the AQC boiler.
2. A cement plant water-to-air heat exchanger system according to claim 1, wherein The water supply system includes a water source, a deaerator (12) communicated with the water source, a water supply pipeline communicated with the outlet of the deaerator (12) and a water supply pump (9) arranged on the water supply pipeline, and the water supply pipeline is communicated with the cold water inlet of the water-cooling part.
3. The cement plant water-to-air heat exchanger system of claim 1, wherein, The water supply system includes a water treatment system (11), a water tank (10) communicated with the water treatment system (11), a water supply pipeline communicated with the outlet of the water tank (10) and a water supply pump (9) arranged on the water supply pipeline, and the water supply pipeline is communicated with the cold water inlet of the water-cooling part, and the water outlet inlet of the water-cooling part is communicated with the hot water supply system.
4. The cement plant water-to-air heat exchanger system of claim 1, wherein, The water supply system includes a water treatment system (11), a water tank (10) communicated with the water treatment system (11), a water supply pipeline communicated with the outlet of the water tank (10) and a water supply pump (9) arranged on the water supply pipeline, and the water supply pipeline is communicated with the cold water inlet of the water-cooling part, and the water outlet inlet of the water-cooling part is communicated with the heating system.
5. A cement plant water-to-air heat exchanger system as claimed in claim 1, wherein, The dust removal system includes a dust collector (8) and a chimney communicated with the gas outlet of the dust collector (8), and an induced draft fan is arranged on the connecting pipeline of the dust collector (8) and the chimney.
6. A cement plant water-to-air heat exchanger system according to claim 5, wherein The dust collector (8) is a bag dust collector.
7. A cement plant water-to-air heat exchanger system according to claim 6, wherein A cyclone dust collector is further included, the gas inlet of the dust collector (8) is communicated with the gas outlet of the cyclone dust collector, and the gas inlet of the cyclone dust collector is communicated with the flue gas outlet.
8. A cement plant water-to-air heat exchanger system according to claim 7, wherein A dust accumulation system is further included, the dust accumulation system includes a first dust accumulation conveying line (6) located at the bottom of the dust collector (8), a second dust accumulation conveying line (5) arranged at the bottom of the water-cooling and air-cooling heat composite exchanger (3) and a third dust accumulation conveying line (4) arranged at the dust outlet of the kiln head grate cooler (1).
9. A cement plant water-to-air heat exchanger system according to claim 8, wherein, The height of the first dust conveying line (6), the second dust conveying line (5) and the third dust conveying line (4) is lowered once, the output end of the first dust conveying line (6) is located on the second dust conveying line (5), the output end of the second dust conveying line (5) is located above the third dust conveying line (4), and the output end of the third dust conveying line (4) is connected with a dust bin (7).
10. The cement plant water-to-air heat exchanger system of claim 1, wherein, The water cooling part comprises a serpentine heat exchange pipe in the exchanger shell, one end of the serpentine heat exchange pipe is communicated with the cold water inlet, and the other end is communicated with the cold water outlet.