Comprehensive water supply and drug dosing system and method for utilizing coking waste heat in full dry quenching mode

Abstract

The present invention relates to the field of dry coke quenching technology, and in particular to a comprehensive water supply and dosing system and method for utilizing coking waste heat in a full dry coke quenching mode. It includes a water supply system, a dosing system and a waste heat utilization device. The waste heat utilization device includes a dry coke quenching waste heat device, a coke oven flue gas waste heat device and a coke oven riser waste heat device. The waste heat utilization devices share a water supply system and a dosing system; the water supply system includes a desalted water tank, a deoxygenated water supply pump, a deaerator and a boiler water supply pump connected in sequence through pipelines, and the waste heat utilization device is connected to the water supply system pipeline; the dosing system includes a deoxidizer dosing device, a phosphate dosing device and an ammonia dosing device. The dosing system is connected to the water supply system through a pipeline, and the waste heat utilization device is connected to the dosing system through a pipeline. It is possible to realize that a plurality of waste heat utilization devices share a water supply and dosing system, which has the advantages of a small number of equipment, a simple system, a small investment, a small footprint and a low operating cost.

Description

Technical Field

[0001] The present invention relates to the technical field of dry coke quenching, and in particular to a comprehensive water supply and drug dosing system and method for utilizing coking waste heat in a full dry coke quenching mode. Background Art

[0002] Dry quenching is a major energy-saving and environmental protection technology in the steel industry. It is a quenching technology that replaces wet quenching. Dry quenching technology can improve the quality of coke, avoid environmental pollution caused by wet quenching, and recover the sensible heat of red coke, thus playing a dual role of energy saving and environmental protection.

[0003] With the continuous maturity and improvement of coking waste heat utilization technology, waste heat utilization technologies such as dry coke quenching waste heat, coke oven flue gas waste heat, and coke oven riser waste heat have been popularized and promoted. In addition, various countries pay more and more attention to environmental protection, and some regions in my country have begun to stipulate that new coking projects must adopt the full dry coke quenching mode.

[0004] In previous projects, the waste heat water supply systems for CDQ waste heat, coke oven flue gas waste heat, coke oven riser waste heat, etc., have different steam production pressures. For example, CDQ waste heat produces 3.82MPa or 9.81MPa steam, while coke oven flue gas waste heat and coke oven riser waste heat produce 0.6-0.8MPa steam. They are all independent water supply and dosing systems, and need to be equipped with CDQ waste heat boiler water supply pump station, coke oven flue gas waste heat boiler water supply pump station, and coke oven riser waste heat vaporization station water supply pump station. Each station is equipped with desalted water tank, deaerator water supply pump, boiler water supply pump, dosing equipment, and different water supply and dosing equipment. The system is complex, occupies a lot of space, and requires large investment. It fails to comprehensively consider different coking waste heat utilization water supply and dosing systems. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a comprehensive water supply and dosing system and method for utilizing coking waste heat in a full dry quenching mode, which can realize the sharing of water supply and dosing systems for multiple waste heat utilization devices, and has the advantages of few equipment units, simple system, small investment, small footprint and low operating cost.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A comprehensive water supply and dosing system for utilizing coking waste heat in a full dry coke quenching mode comprises a water supply system, a dosing system and a waste heat utilization device, wherein the waste heat utilization device comprises a dry coke quenching waste heat device, a coke oven flue gas waste heat device and a coke oven riser waste heat device, and the waste heat utilization devices share the water supply system and the dosing system; the water supply system comprises a desalted water tank, a deoxygenated water supply pump, a deaerator and a boiler water supply pump which are sequentially connected through pipelines, and the waste heat utilization device is connected to the water supply system pipeline; the dosing system comprises a deoxidizer dosing device, a phosphate dosing device and an ammonia dosing device, the dosing system is connected to the water supply system through a pipeline, and the waste heat utilization device is connected to the dosing system through a pipeline.

[0008] The water supply system also includes a water supply preheating device. The desalted water tank is connected to the deoxygenated water supply pump through a desalted water pipeline. The deoxygenated water supply pump is connected to the water supply preheating device through a desalted water deoxygenated water supply pipeline. The water supply preheating device is connected to the deaerator through a desalted water deoxygenated water return pipeline. The deaerator is connected to the boiler water supply pump through a deoxygenated water pipeline. The boiler water supply pump is connected to the dry coke quenching boiler pipeline.

[0009] The coke oven flue gas waste heat device and the coke oven riser waste heat device are fed with water from a boiler feed water pump.

[0010] It also includes a feed water regulating valve, which is arranged in front of the boiler feed water pump tap water pipeline to the coke oven flue gas waste heat and coke oven riser waste heat utilization device.

[0011] The deoxidizer dosing equipment is connected with the deionized water deoxidation water supply pipeline and the deoxidized water pipeline through the deoxidizer dosing pipeline.

[0012] The phosphate dosing equipment is connected with the boiler feed water pipeline and the tap water pipeline through the phosphate dosing pipeline.

[0013] The ammonia dosing equipment is connected with the demineralized water pipeline through the ammonia dosing pipeline.

[0014] A comprehensive water supply and drug addition method for utilizing coking waste heat in a full dry quenching mode, specifically comprising:

[0015] 1) The desalted water in the desalted water tank is sent to the deaerator water feed pump through the desalted water pipeline, pressurized by the deaerator water feed pump, sent to the water feed preheating device through the desalted water deaerator water feed pipeline for heating, and then enters the deaerator through the desalted water deaerator return pipeline;

[0016] 2) After deoxidation, the deoxidized water is pressurized by the boiler feed water pump through the deoxidized water pipeline and sent to the dry coke quenching boiler through the boiler feed water pipeline; the boiler feed water pump is pressurized and sent to the coke oven flue gas waste heat boiler and the coke oven riser waste heat vaporization device through the tap water pipeline;

[0017] 3) The deoxidizer is delivered from the deoxidizer dosing equipment to the deionized water deoxidation water supply pipeline and the deoxidized water pipeline through the deoxidizer dosing pipeline;

[0018] 4) Phosphate reagent is sent from the phosphate dosing equipment to the boiler feed water pipeline and tap water pipeline through the phosphate dosing pipeline to keep the boiler water in the drum at a certain concentration of PO4 3－ , prevent the formation of sediment;

[0019] 5) Ammonia agent is sent from ammonia dosing equipment to the boiler desalted water pipeline through ammonia dosing pipeline to adjust the pH of comprehensive water supply for coking waste heat utilization.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The present invention integrates the water supply and dosing of various waste heat utilization devices in the coking project, so that various waste heat utilization devices such as dry coke quenching waste heat, coke oven flue gas waste heat, coke oven riser waste heat, etc. share a water supply and dosing system, which is composed of a unified desalted water tank, deaerator, boiler feed pump, dosing equipment, water supply and dosing system, and has the advantages of few equipment units, simple system, small investment, small footprint and low operating cost.

[0022] 2) The present invention configures the boiler feed water pump according to the dry coke quenching boiler feed water pressure, and uses the boiler feed water pump tap water to supply the coke oven flue gas waste heat and the coke oven riser waste heat, thereby solving the problem that the boiler feed water pressures of various waste heat facilities are different and boiler feed water pumps need to be set up separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure and process principle of the present invention.

[0024] In the figure: 1- desalted water tank 2- deaerator feed water pump 3- radial heat pipe feed water preheating device 4- deaerator 5- boiler feed water pump 6- dry coke quenching boiler 7- coke oven flue gas waste heat boiler 8- coke oven riser waste heat vaporization device 9- deoxidizer dosing equipment 10- phosphate dosing equipment 11- ammonia dosing equipment 12- desalted water pipeline 13- desalted water (deaerator feed water) pipeline 14- desalted water (deaerator return water) pipeline 15- deaerator water pipeline 16- boiler feed water pipeline 17- tap water pipeline 18- deoxidizer dosing pipeline 19- phosphate dosing pipeline 20- ammonia dosing pipeline DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0026] like Figure 1As shown, a comprehensive water supply and dosing system for utilizing coking waste heat in a full dry coke quenching mode includes a desalted water tank (2 units) 1, a deoxygenated water supply pump (2 units or more units) 2, 2 or more radial heat pipe water supply preheating devices 3, a deaerator (2 units or more units) 4, a boiler water supply pump (2 units or more units) 5, a dry coke quenching boiler (2 units or more units) 6, a coke oven flue gas waste heat boiler (1 unit or more units) 7, a coke oven riser waste heat vaporization device (1 unit) or more) 8. deoxidizer dosing equipment (1 unit) 9. phosphate dosing equipment (2 or more phosphate dosing equipment) 10. ammonia dosing equipment (1 unit) 11. deionized water pipeline 12. deionized water (deoxygenated feed water) pipeline 13. deionized water (deoxygenated return water) pipeline 14. deoxygenated water pipeline 15. boiler feed water pipeline 16. tap water pipeline 17. deoxidizer dosing pipeline 18. phosphate dosing pipeline 19 and ammonia dosing pipeline 20.

[0027] In the attached drawings, "2" for CDQ boilers represents 2 or more units, and "1" for other equipment represents 1 or more units. The specific number of units can be found in the brackets in the previous text.

[0028] The water supply system includes a desalted water tank 1, a desalted water pipeline 12, a deoxygenated water feed pump 2, a desalted water deoxygenated water feed pipeline 13, a radial heat pipe water feed preheating device 3, a desalted water (deoxygenated return water) pipeline 14, a deoxygenated water pipeline 15, a boiler feed water pump 5, and a boiler feed water pipeline 16.

[0029] The desalted water tank 1, the desalted water pipeline 12, the deoxygenated water feed pump 2, the desalted water deoxygenated water feed pipeline 13, the radial heat pipe feed water preheating device 3, the desalted water (deoxygenated return water) pipeline 14, the deoxygenated water pipeline 15, the boiler feed water pump 5, and the boiler feed water pipeline 16 are connected in sequence.

[0030] The waste heat utilization device comprises a coke oven flue gas waste heat boiler 7 for producing low-pressure steam and a coke oven riser waste heat vaporization device 8.

[0031] The boiler feed water pipeline 16 is connected to the dry coke quenching boiler 6 , the coke oven flue gas waste heat boiler 7 is connected to the boiler feed water pump 5 through the tap water pipeline 17 , and the coke oven riser waste heat vaporization device 8 is connected to the boiler feed water pump 5 through the tap water pipeline 17 .

[0032] The coke oven flue gas waste heat boiler 7 and the coke oven riser waste heat vaporization device 8 use the boiler feed water pump 5 to tap water. The feed water regulating valve is arranged between the boiler feed water pump tap water pipeline 17 to the coke oven flue gas waste heat boiler 7 and the coke oven riser waste heat vaporization device.

[0033] The dosing system includes a deoxidizer dosing device 9, a phosphate dosing device 10, an ammonia dosing device 11, a deoxidizer dosing pipeline 18, a phosphate dosing pipeline 19 and an ammonia dosing pipeline 20. The deoxidizer dosing device 9 is connected to the deoxidized water pipeline 15 through the deoxidizer dosing pipeline 18.

[0034] A comprehensive water supply and drug addition method for utilizing coking waste heat in a full dry quenching mode, specifically comprising:

[0035] 1) The desalted water in the desalted water tank 1 is sent to the deoxygenated water feed pump 2 through the desalted water pipeline 12, pressurized by the deoxygenated water feed pump 2, sent to the radial heat pipe type water feed preheating device 3 through the desalted water (deoxygenated water feed) pipeline 13 for heating, and then enters the deaerator 4 through the desalted water (deoxygenated return water) pipeline 14.

[0036] 2) After deoxygenation, the gas is pressurized by the boiler feed water pump 5 through the deoxygenated water pipeline 15, and sent to the dry coke quenching boiler 6 through the boiler feed water pipeline 16, and is pressurized by the boiler feed water pump 5 through the tap water pipeline 17 and sent to the coke oven flue gas waste heat boiler 7 and the coke oven riser waste heat vaporization device 8.

[0037] 3) The deoxidizer is delivered from the deoxidizer dosing device 9 to the desalted water (deoxidized feed water) pipeline 13 and the deoxidized water pipeline 15 via the deoxidizer dosing pipeline 18 to ensure that the dissolved oxygen in the boiler feed water meets the boiler feed water index and avoid oxidation corrosion of the boiler and its steam-water system.

[0038] 4) Phosphate reagent is sent from phosphate dosing equipment 10 to boiler feed water pipeline 16 and tap water pipeline 17 through phosphate dosing pipeline 19 to keep boiler water in the drum at a certain concentration of PO4 3－ , prevent the formation of precipitates such as CaSO4 and CaSiO3.

[0039] 5) Ammonia agent is delivered from ammonia dosing equipment 11 to boiler demineralized water pipeline 12 via ammonia dosing pipeline 20 to adjust the pH of feed water.

[0040] The present invention integrates the water supply and drug addition of various waste heat utilization devices in the coking project, so that various waste heat utilization devices such as dry coke quenching waste heat, coke oven flue gas waste heat, and coke oven riser waste heat share a water supply and drug addition system. The system consists of a unified desalted water tank, deoxygenated water supply pump, deaerator, boiler feed water pump, drug addition equipment, and water supply and drug addition system. At the same time, the tap water of the boiler feed water pump is used to solve the problem that the boiler feed water pressure is different and the boiler feed water pump needs to be set separately. The system has the advantages of few equipment units, simple system, small investment, small footprint and low operating cost.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A comprehensive water supply and drug dosing system for utilizing coking waste heat in full dry quenching mode, characterized by: It includes a water supply system, a dosing system and a waste heat utilization device. The waste heat utilization device includes a dry coke quenching waste heat device, a coke oven flue gas waste heat device and a coke oven riser waste heat device. The waste heat utilization devices share the water supply system and the dosing system. The water supply system includes a desalted water tank, a deoxygenated water supply pump, a deaerator and a boiler water supply pump connected in sequence through pipelines. The waste heat utilization device is connected to the water supply system pipeline. The dosing system includes a deoxidizer dosing device, a phosphate dosing device and an ammonia dosing device. The dosing system is connected to the water supply system through a pipeline, and the waste heat utilization device is connected to the dosing system through a pipeline. The coke oven flue gas waste heat device and the coke oven riser waste heat device are fed with tap water from a boiler feed water pump; It also includes a feed water regulating valve, which is arranged in front of the tap water pipeline of the boiler feed water pump to the coke oven flue gas waste heat and the coke oven riser waste heat utilization device; The deoxidizer dosing equipment is connected to the deionized water deoxidation water supply pipeline and the deoxidized water pipeline through the deoxidizer dosing pipeline; The phosphate dosing equipment is connected to the boiler feed water pipeline and the tap water pipeline through the phosphate dosing pipeline; The ammonia dosing equipment is connected with the demineralized water pipeline through the ammonia dosing pipeline.

2. According to claim 1, a comprehensive water supply and drug dosing system for utilizing coking waste heat in full dry quenching mode, characterized in that: The water supply system also includes a water supply preheating device. The desalted water tank is connected to the deoxygenated water supply pump through a desalted water pipeline. The deoxygenated water supply pump is connected to the water supply preheating device through a desalted water deoxygenated water supply pipeline. The water supply preheating device is connected to the deaerator through a desalted water deoxygenated water return pipeline. The deaerator is connected to the boiler water supply pump through a deoxygenated water pipeline. The boiler water supply pump is connected to the dry coke quenching boiler pipeline.

3. A method for comprehensive water supply and dosing of coking waste heat in full dry quenching mode based on the comprehensive water supply and dosing system for coking waste heat in full dry quenching mode according to claim 1 or 2, characterized in that: Specifically include: 1) The desalted water in the desalted water tank is sent to the deaerator water feed pump through the desalted water pipeline, pressurized by the deaerator water feed pump, sent to the water feed preheating device through the desalted water deaerator water feed pipeline for heating, and then enters the deaerator through the desalted water deaerator return pipeline; 2) After deoxidation, the deoxidized water is pressurized by the boiler feed water pump through the deoxidized water pipeline and sent to the dry coke quenching boiler through the boiler feed water pipeline; the boiler feed water pump is pressurized and sent to the coke oven flue gas waste heat boiler and the coke oven riser waste heat vaporization device through the tap water pipeline; 3) The deoxidizer is delivered from the deoxidizer dosing equipment to the deionized water deoxidation water supply pipeline and the deoxidized water pipeline through the deoxidizer dosing pipeline; 4) Phosphate reagent is sent from the phosphate dosing equipment to the boiler feed water pipeline and tap water pipeline through the phosphate dosing pipeline to keep the boiler water in the drum at a certain concentration of PO4 3－ , prevent the formation of sediment; 5) Ammonia agent is delivered from ammonia dosing equipment to the boiler desalted water pipeline through ammonia dosing pipeline to adjust the pH of comprehensive feed water for coking waste heat utilization.

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