Method for preventing dry burning of ultra-high temperature, ultra-high pressure, single intermediate reheat dry quenching boiler

Abstract

The present invention relates to the technical field of stable production of ultra-high temperature, ultra-high pressure, and single intermediate reheating dry quenching boilers, and in particular to a method for preventing dry burning of ultra-high temperature, ultra-high pressure, and single intermediate reheating dry quenching boilers. After being mixed in a desalted water tank, the deionized water supplemented externally and the condensed water returned from the condenser of a steam turbine generator set are pressurized by a deoxygenating water feed pump, sent to a preheating device for heating and temperature rise, and then enter a deaerator. After deoxygenation, the boiler feed pump pressurizes and sends it to the dry quenching boiler, and passes through an economizer, an evaporator, and a superheater in sequence to produce main steam, which is sent to the high-pressure cylinder or high-pressure bypass of the steam turbine generator set. The low-temperature reheated steam discharged from the high-pressure cylinder or high-pressure bypass of the steam turbine generator set is sent to the reheater, and the reheated steam generated after heating is sent to the medium and low-pressure cylinders or low-pressure bypass of the steam turbine generator set. The exhaust steam discharged from the medium and low-pressure cylinders of the steam turbine generator set is condensed into water through a condenser. In the case of water loss in the boiler feed water and steam failure in the reheater, water and steam can be automatically replenished, thereby ensuring the safe production of the dry quenching waste heat boiler.

Description

Technical Field

[0001] The invention relates to the technical field of stable production of ultra-high temperature, ultra-high pressure, single intermediate reheating dry quenching coke boilers, and in particular to a method for preventing dry burning of ultra-high temperature, ultra-high pressure, single intermediate reheating dry quenching coke boilers. Background Art

[0002] The dry coke quenching thermal system is to generate steam by absorbing the heat of circulating gas in the dry coke quenching boiler, and to recover the sensible heat of red coke by driving the steam turbine generator set to generate electricity and supply heat. The dry coke quenching thermal system is the main measure for circular economy and energy conservation in the dry coke quenching device, so the stable and safe operation of the dry coke quenching waste heat boiler is particularly important.

[0003] Accidents of ultra-high temperature, ultra-high pressure, and single intermediate reheating dry quenching boilers mainly include: boiler tube burst, boiler full of water, boiler dry burning due to lack of water, boiler overpressure and overtemperature, etc. Each accident will cause huge losses. Boiler dry burning due to lack of water will cause the wall temperature of economizer, water-cooled wall, superheater, reheater, etc. to exceed the standard. Improper handling may cause explosion accidents. Therefore, it is necessary to find a method to prevent dry burning of ultra-high temperature, ultra-high pressure, and single intermediate reheating dry quenching boilers to prevent safety accidents caused by boiler feed water loss and reheater steam failure, so as to ensure the stable and safe operation of dry quenching waste heat boilers. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method for preventing dry burning of an ultra-high temperature, ultra-high pressure, single intermediate reheat dry quenching coke boiler, which can automatically replenish water and steam when the boiler feed water loses water and the reheater is cut off from steam, thereby ensuring the safe production of the dry quenching coke waste heat boiler.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A super-high temperature, super-high pressure, single intermediate reheat dry quenching coke boiler anti-dry burning system, a desalted water tank, a deaerator feed water pump, a preheating device, a deaerator, a boiler feed water pump, a boiler feed water pipeline, and an economizer are connected in sequence by pipelines; a superheater, a main steam pipeline, a high-pressure cylinder of a steam turbine generator set, a low-temperature reheat steam pipeline, and a reheater are connected in sequence by pipelines; a reheater, a high-temperature reheat steam pipeline, a medium- and low-pressure cylinder of a steam turbine generator set, a condenser, and a desalted water tank are connected in sequence by pipelines; an automatic water replenishment pipeline is arranged from the outlet of the deaerator feed water pump to the boiler feed water pipeline, an automatic steam replenishment pipeline connected to the drying furnace steam pipeline is arranged on the low-temperature reheat steam pipeline, a main steam discharge pipeline is arranged between the main steam pipeline and the muffler, and a high-temperature reheat steam discharge pipeline is arranged between the high-temperature reheat steam pipeline and the muffler.

[0007] It also includes an evaporator. The economizer, evaporator, reheater and superheater are arranged in the dry coke quenching boiler furnace.

[0008] It also includes a high-pressure bypass, which is arranged between the main steam pipeline and the low-temperature reheat steam pipeline. One end of the high-pressure bypass is connected to the main steam pipeline, and the other end is connected to the low-temperature reheat steam pipeline.

[0009] It also includes a low-pressure bypass, one end of which is connected to the high-temperature reheat steam pipeline, and the other end is connected to the condenser.

[0010] It also includes a steam drum, which is connected to the steam pipeline of the drying furnace.

[0011] An electric valve and a check valve are arranged in sequence on the automatic water replenishment pipeline.

[0012] An electric valve and a check valve are arranged in sequence on the automatic steam replenishment pipeline.

[0013] A method for preventing dry burning of an ultra-high temperature, ultra-high pressure, single intermediate reheating dry quenching coke boiler, specifically comprising:

[0014] 1) The desalted water added externally and the condensed water returned from the condenser of the steam turbine generator set are mixed in the desalted water tank, pressurized by the deoxygenating feedwater pump, and sent to the radial heat pipe feedwater preheating device for heating and temperature rise before entering the deaerator. After deoxygenation, the boiler feedwater pump pressurizes and sends it to the dry coke quenching boiler. After passing through the economizer, evaporator, and superheater in sequence, the main steam with rated parameters is produced and sent to the high-pressure cylinder or high-pressure bypass of the steam turbine generator set. The low-temperature reheated steam discharged from the high-pressure cylinder or high-pressure bypass of the steam turbine generator set is sent to the reheater. After heating, the reheated steam with rated parameters is produced and sent to the medium and low-pressure cylinders or low-pressure bypass of the steam turbine generator set. The exhaust steam discharged from the medium and low-pressure cylinders of the steam turbine generator set is condensed into water through the condenser;

[0015] 2) When the boiler feed water pump fails to supply water, the cut-off valves on the main steam pipeline, low-temperature reheat steam pipeline and high-temperature reheat steam pipeline are automatically closed, and the steam turbine generator set is shut down. At this time, the electric valve on the water supply pipeline can be automatically opened to automatically supply water, and then discharged into the muffler through the main steam release pipeline to prevent the boiler economizer, evaporator and superheater from dry burning. At the same time, the check valve installed on the water supply pipeline can prevent water backflow when the boiler feed water system is operating normally;

[0016] 3) When the CDQ boiler reheater loses steam, the shut-off valves on the main steam pipeline, low-temperature reheat steam pipeline and high-temperature reheat steam pipeline are automatically closed, and the steam turbine generator set is shut down. At this time, the electric valve on the steam supply pipeline can be automatically opened to automatically supply steam, and then discharged into the muffler through the high-temperature reheat steam release pipeline to prevent the boiler reheater from dry burning. At the same time, the check valve installed on the steam supply pipeline can prevent steam backflow during normal operation of the reheat system.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the present invention, when the deaerator liquid level is extremely low, the boiler feed water pump needs to be shut down to avoid damage. At this time, the dry quenching furnace stops the circulating fan, but the heat in the dry quenching furnace cannot be dissipated in a short time, and the water storage in the steam drum is limited. At this time, the cut-off valves on the main steam pipeline, the low-temperature reheat steam pipeline and the high-temperature reheat steam pipeline are automatically closed, the steam turbine generator set is shut down, the boiler loses water, and the reheat steam loses steam. With the evaporation and dispersion, the water level gradually decreases, and the pressure gradually decreases. When it drops to a certain pressure, the automatic water replenishment valve can be opened to replenish water through the automatic water replenishment pipeline, and then discharged into the muffler through the main steam discharge pipeline for discharge. If the reheat steam loses steam, the automatic steam replenishment valve can be opened to replenish steam through the automatic steam replenishment pipeline, and then discharged into the muffler through the high-temperature reheat steam discharge pipeline for discharge.

[0019] The check valve installed on the water supply pipeline can prevent water backflow when the boiler water supply system is operating normally, and the check valve installed on the steam supply pipeline can prevent steam backflow when the reheat system is operating normally. Through water supply and steam supply measures, dry burning of the CDQ waste heat boiler can be prevented under special conditions, ensuring safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure and process principle of the present invention.

[0021] 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 quenching boiler economizer 7- evaporator 8- reheater 9- superheater 10- high pressure cylinder of steam turbine generator set 11- high pressure bypass 12- medium and low pressure cylinders of steam turbine generator set 13- low pressure bypass 14- condenser 15- steam drum 16- silencer 17- boiler feed water pipeline 18- main steam pipeline 19- low temperature reheat steam pipeline 20- high temperature reheat steam pipeline 21- make-up water pipeline 22- make-up steam pipeline 23- main steam vent pipeline 24- high temperature reheat steam vent pipeline 25- oven steam pipeline. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0023] like Figure 1As shown, an ultra-high temperature, ultra-high pressure, single intermediate reheat dry quenching boiler anti-dry burning system includes a desalted water tank 1, a deaerator feed water pump 2, a radial heat pipe feed water preheating device 3, a deaerator 4, a boiler feed water pump 5, a dry quenching boiler economizer 6, an evaporator 7, a reheater 8, a superheater 9, a high-pressure cylinder 10 of a steam turbine generator set, a high-pressure bypass 11, a medium- and low-pressure cylinder 12 of a steam turbine generator set, a low-pressure bypass 13, a condenser 14, a steam drum 15, a muffler 16, a boiler feed water pipeline 17, a main steam pipeline 18, a low-temperature reheat steam pipeline 19, a high-temperature reheat steam pipeline 20, a make-up water pipeline 21, a make-up steam pipeline 22, a main steam discharge pipeline 23, a high-temperature reheat steam discharge pipeline 24 and a drying furnace steam pipeline 25.

[0024] The dry coke quenching boiler economizer 6, evaporator 7, reheater 8 and superheater 9 are arranged in the dry coke quenching boiler furnace body.

[0025] The desalted water tank 1, the deaerator feed water pump 2, the radial heat pipe feed water preheating device 3, the deaerator 4, the boiler feed water pump 5, the boiler feed water pipeline 17, and the dry coke quenching boiler economizer 6 are connected in sequence by pipelines. The outlet of the desalted water tank 1 is connected to the inlet pipeline of the deaerator feed water pump 2, the outlet of the deaerator feed water pump 2 is connected to the inlet pipeline of the radial heat pipe feed water preheating device 3, the outlet of the radial heat pipe feed water preheating device 3 is connected to the inlet pipeline of the deaerator 4, the outlet of the deaerator 4 is connected to the inlet pipeline of the boiler feed water pump 5, the outlet of the boiler feed water pump 5 is connected to one end of the boiler feed water pipeline 17, and the other end of the boiler feed water pipeline 17 is connected to the dry coke quenching boiler economizer 6.

[0026] The superheater 9, the main steam pipeline 18, the high-pressure cylinder 10 of the steam turbine generator set, the low-temperature reheat steam pipeline 19, and the reheater 8 are connected in sequence. The outlet of the superheater 9 is connected to one end of the main steam pipeline 18, the other end of the main steam pipeline 18 is connected to the inlet of the high-pressure cylinder 10 of the steam turbine generator set, the outlet of the high-pressure cylinder 10 of the steam turbine generator set is connected to one end of the low-temperature reheat steam pipeline 19, and the other end of the low-temperature reheat steam pipeline 19 is connected to the reheater 8.

[0027] The reheater 8, the high-temperature reheat steam pipeline 20, the medium and low pressure cylinders 12 of the steam turbine generator set, the condenser 14, and the desalted water tank 1 are connected in sequence by pipelines. The outlet of the reheater 8 is connected to one end of the high-temperature reheat steam pipeline 20, and the other end of the high-temperature reheat steam pipeline 20 is connected to the inlet of the medium and low pressure cylinder 12 of the steam turbine generator set. The outlet of the medium and low pressure cylinder 12 of the steam turbine generator set is connected to the inlet pipeline of the condenser 14, and the outlet of the condenser 14 is connected to the inlet pipeline of the desalted water tank 1.

[0028] An automatic water replenishment pipeline 21 is provided on the pipeline 17 from the outlet of the deaeration water pump 2 to the boiler water supply pipeline. One end of the water replenishment pipeline 21 is connected to the outlet of the deaeration water pump 2 , and the other end is connected to the boiler water supply pipeline 17 .

[0029] An automatic steam supply pipeline 22 connected to the self-boiler steam pipeline 25 is provided on the low-temperature reheat steam pipeline 19 . One end of the automatic steam supply pipeline 22 is connected to the self-boiler steam pipeline 25 , and the other end is connected to the low-temperature reheat steam pipeline 19 .

[0030] A main steam release pipeline 23 is arranged between the main steam pipeline 18 and the muffler 16 . One end of the main steam release pipeline 23 is connected to the main steam pipeline 18 , and the other end is connected to the muffler 16 .

[0031] A high-temperature reheat steam discharge pipeline 24 is arranged between the high-temperature reheat steam pipeline 20 and the muffler 16 , and one end of the high-temperature reheat steam discharge pipeline 24 is connected to the high-temperature reheat steam pipeline 20 , and the other end is connected to the high-temperature reheat steam discharge pipeline 24 .

[0032] An electric valve and a check valve are sequentially arranged on the automatic water supply pipeline 21. An electric valve and a check valve are sequentially arranged on the automatic steam supply pipeline 22.

[0033] The high-pressure bypass 11 is arranged between the main steam pipeline 18 and the low-temperature reheat steam pipeline 19. One end of the high-pressure bypass 11 is connected to the main steam pipeline 18, and the other end is connected to the low-temperature reheat steam pipeline 19. One end of the low-pressure bypass 13 is connected to the high-temperature reheat steam pipeline 20, and the other end is connected to the inlet of the condenser 14. The steam drum 15 is connected to the drying furnace steam pipeline 25.

[0034] A method for preventing dry burning of an ultra-high temperature, ultra-high pressure, single intermediate reheating dry quenching coke boiler, specifically comprising:

[0035] 1) The desalted water added externally and the condensed water returned from the condenser 14 of the steam turbine generator set are mixed in the desalted water tank 1, pressurized by the deoxygenating feed water pump 2, and sent to the radial heat pipe feed water preheating device 3 for heating and temperature rise, and then enter the deaerator 4. After deoxygenation, the boiler feed water pump 5 pressurizes and sends it to the dry coke quenching boiler, and passes through the economizer 6, evaporator 7, and superheater 9 in sequence to produce the main steam of rated parameters, which is sent to the high-pressure cylinder 10 or high-pressure bypass 11 of the steam turbine generator set. The low-temperature reheated steam discharged from the high-pressure cylinder 10 or high-pressure bypass 11 of the steam turbine generator set is sent to the reheater 8, and after being heated, The high-temperature reheat steam with rated parameters is sent to the medium and low-pressure cylinders 12 or the low-pressure bypass 13 of the steam turbine generator set. The exhaust steam discharged from the medium and low-pressure cylinders 12 of the steam turbine generator set is condensed into water through the condenser 14. An automatic water replenishment pipeline 21 is arranged between the outlet of the deaeration feed water pump 2 and the boiler feed water pipeline 17. An automatic steam replenishment pipeline 22 connected to the drying furnace steam pipeline 25 is arranged on the low-temperature reheat steam pipeline 19. A main steam discharge pipeline 23 is arranged between the main steam pipeline 18 and the muffler 16. A high-temperature reheat steam discharge pipeline 24 is arranged between the high-temperature reheat steam pipeline 20 and the muffler 16.

[0036] 2) An automatic water replenishment pipeline 21 is provided on the boiler feed water pipeline 17, and an electric valve and a check valve are provided on the automatic water replenishment pipeline 21. When the boiler feed water pump cannot supply water, the cut-off valves on the main steam pipeline 18, the low-temperature reheat steam pipeline 19 and the high-temperature reheat steam pipeline 20 are automatically closed, and the steam turbine generator set is shut down. At this time, the electric valve on the water replenishment pipeline 21 can be automatically opened to automatically replenish water, and then discharged into the muffler 16 through the main steam release pipeline 23 for release, so as to prevent the dry burning of the economizer 6, the evaporator 7 and the superheater 9 of the dry quenching boiler. At the same time, the check valve provided on the water replenishment pipeline 21 can prevent water from flowing back when the boiler feed water system is operating normally.

[0037] 3) An automatic steam supply pipeline 22 is provided, and an electric valve and a check valve are respectively provided on the automatic steam supply pipeline 22. When the CDQ boiler reheater loses steam, the cut-off valves on the main steam pipeline 18, the low-temperature reheat steam pipeline 19 and the high-temperature reheat steam pipeline 20 are automatically closed, and the steam turbine generator set is shut down. At this time, the electric valve on the steam supply pipeline 22 can be automatically opened to automatically supply steam, and then the steam is discharged into the muffler 16 through the high-temperature reheat steam discharge pipeline 24 to prevent the boiler reheater 8 from burning dry. At the same time, the check valve provided on the steam supply pipeline 22 can prevent steam backflow when the reheat system is operating normally.

[0038] In the present invention, when the liquid level of the deaerator 4 is extremely low, the boiler feed water pump needs to be shut down to avoid damage. At this time, the circulating fan of the dry quenching furnace is stopped, but the heat in the dry quenching furnace cannot be dissipated in a short time, and the water storage in the steam drum is limited. At this time, the cut-off valves on the main steam pipeline 18, the low-temperature reheat steam pipeline 19 and the high-temperature reheat steam pipeline 20 are automatically closed, the steam turbine generator set is shut down, the boiler loses water, and the reheat steam loses steam. With the evaporation and dispersion, the water level gradually decreases, and the pressure gradually decreases. When it drops to a certain pressure, the automatic water replenishment valve can be opened to supplement water through the automatic water replenishment pipeline 21, and then discharged into the muffler 16 through the main steam release pipeline 23 for release. If the reheat steam loses steam, the automatic steam replenishment valve can be opened to supplement steam through the automatic steam replenishment pipeline 22, and then discharged into the muffler 16 through the high-temperature reheat steam release pipeline 24 for release.

[0039] The present invention can automatically replenish water and steam when the boiler feed water is dehydrated and the reheater is cut off from steam, thereby ensuring the safe production of the dry coke quenching waste heat boiler.

[0040] 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. Ultra-high temperature, ultra-high pressure, primary intermediate reheating dry quenching boiler anti-dry burning system, characterized by: The desalted water tank, deaerator feed water pump, preheating device, deaerator, boiler feed water pump, boiler feed water pipeline, and economizer are connected in sequence by pipelines; the superheater, main steam pipeline, high-pressure cylinder of the steam turbine generator set, low-temperature reheat steam pipeline, and reheater are connected in sequence by pipelines; the reheater, high-temperature reheat steam pipeline, medium- and low-pressure cylinders of the steam turbine generator set, condenser, and desalted water tank are connected in sequence by pipelines; an automatic water supply pipeline is set from the outlet of the deaerator feed water pump to the boiler feed water pipeline, an automatic steam supply pipeline connected to the drying furnace steam pipeline is set on the low-temperature reheat steam pipeline, a main steam release pipeline is set between the main steam pipeline and the muffler, and a high-temperature reheat steam release pipeline is set between the high-temperature reheat steam pipeline and the muffler; It also includes a high-pressure bypass, which is arranged between the main steam pipeline and the low-temperature reheat steam pipeline, one end of the high-pressure bypass is connected to the main steam pipeline, and the other end is connected to the low-temperature reheat steam pipeline; It also includes a low-pressure bypass, one end of which is connected to the high-temperature reheat steam pipeline, and the other end is connected to the condenser.

2. The anti-dry burning system for ultra-high temperature, ultra-high pressure, single intermediate reheating coke dry quenching boiler according to claim 1 is characterized by: It also includes an evaporator. The economizer, evaporator, reheater and superheater are arranged in the dry coke quenching boiler furnace.

3. The anti-dry burning system for ultra-high temperature, ultra-high pressure, single intermediate reheating coke dry quenching boiler according to claim 1 is characterized by: It also includes a steam drum, which is connected to the steam pipeline of the drying furnace.

4. The anti-dry burning system for ultra-high temperature, ultra-high pressure, single intermediate reheating coke dry quenching boiler according to claim 1 is characterized by: An electric valve and a check valve are arranged in sequence on the automatic water replenishment pipeline.

5. The anti-dry burning system for ultra-high temperature, ultra-high pressure, single intermediate reheating coke dry quenching boiler according to claim 1 is characterized by: An electric valve and a check valve are arranged in sequence on the automatic steam replenishment pipeline.

6. A method for preventing dry burning of a super high temperature, super high pressure, single intermediate reheat dry quenching boiler according to any one of claims 1 to 5, characterized in that: Specifically include: 1) The desalted water added externally and the condensed water returned from the condenser of the steam turbine generator set are mixed in the desalted water tank, pressurized by the deoxygenating feedwater pump, and sent to the radial heat pipe feedwater preheating device for heating and temperature rise before entering the deaerator. After deoxygenation, the boiler feedwater pump pressurizes and sends it to the dry coke quenching boiler. After passing through the economizer, evaporator, and superheater in sequence, the main steam with rated parameters is produced and sent to the high-pressure cylinder or high-pressure bypass of the steam turbine generator set. The low-temperature reheated steam discharged from the high-pressure cylinder or high-pressure bypass of the steam turbine generator set is sent to the reheater. After heating, the reheated steam with rated parameters is produced and sent to the medium and low-pressure cylinders or low-pressure bypass of the steam turbine generator set. The exhaust steam discharged from the medium and low-pressure cylinders of the steam turbine generator set is condensed into water through the condenser; 2) When the boiler feed water pump fails to supply water, the cut-off valves on the main steam pipeline, low-temperature reheat steam pipeline and high-temperature reheat steam pipeline are automatically closed, and the steam turbine generator set is shut down. At this time, the electric valve on the water supply pipeline can be automatically opened to automatically supply water, and then discharged into the muffler through the main steam release pipeline to prevent the boiler economizer, evaporator and superheater from dry burning. At the same time, the check valve installed on the water supply pipeline can prevent water backflow when the boiler feed water system is operating normally; 3) When the CDQ boiler reheater loses steam, the shut-off valves on the main steam pipeline, low-temperature reheat steam pipeline and high-temperature reheat steam pipeline are automatically closed, and the steam turbine generator set is shut down. At this time, the electric valve on the steam supply pipeline can be automatically opened to automatically supply steam, and then discharged into the muffler through the high-temperature reheat steam release pipeline to prevent the boiler reheater from dry burning. At the same time, the check valve installed on the steam supply pipeline can prevent steam backflow during normal operation of the reheat system.

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