Drainage and deflation system of dry quenching boiler

Abstract

The utility model provides a water drainage and deflation system of a dry quenching boiler, which belongs to the technical field of dry quenching and comprises an economizer, a steam pocket, a periodic blowdown expander, a circulating heating system, a pressure water drainage system, a non-pressure water drainage system, a blowdown system and a deflation system. The circulating heating system comprises a lower-stage evaporator, an upper-stage evaporator, a first-stage superheater and a second-stage superheater; water inlets and water outlets of the lower-stage evaporator and the upper-stage evaporator are communicated with the steam pocket; a water inlet and a water outlet of the first-stage superheater are respectively communicated with the steam pocket and the second-stage superheater; an outlet of the secondary superheater is a main steam pipeline; according to the utility model, pressure drainage and non-pressure drainage are separately discharged, so that the problem of steam emission of each layer of funnel of the coke dry quenching boiler is solved, the influence on the work of field staff is avoided, the corrosion condition caused by steam overflow is reduced, and the service life of the coke dry quenching boiler is further prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coke extinguishing, and particularly relates to a dry quenching boiler's water drainage and degassing system. BACKGROUND

[0002] In the patent application No. 202420563426.7, a multi-purpose boiler blowdown heat exchange device and a boiler blowdown heat automatic recovery system are proposed. The application can automatically and accurately control the blowdown amount, save boiler water, and has high cost.

[0003] However, during the start-up and operation stages of the dry quenching boiler, the dry quenching boiler's water collecting well and the funnel of each layer of water drainage and degassing pipeline will produce steam emission. This condition will result in low visibility on site, thereby affecting the work of the on-site staff. In addition, the steam overflow will also cause corrosion to the boiler body steel frame, affecting the service life. UTILITY MODEL CONTENTS

[0004] Based on the above technical problems, the utility model provides a dry quenching boiler's water drainage and degassing system. By separating the pressurized drainage and non-pressurized drainage, the steam emission of the funnel of each layer of the dry quenching boiler is solved, thereby avoiding the impact on the work of the on-site staff and reducing the corrosion caused by steam overflow, and further prolonging the service life of the dry quenching boiler.

[0005] The specific technical scheme is as follows:

[0006] A dry quenching boiler's water drainage and degassing system, comprising: an economizer, a steam drum, a regular blowdown expander, a circulating heating system, a pressurized water drainage system, a non-pressurized water drainage system, a blowdown system, and a degassing system; the circulating heating system comprises a lower evaporator, an upper evaporator, a first-stage superheater, and a second-stage superheater; the water inlet and the water outlet of the lower evaporator and the upper evaporator are in communication with the steam drum; the water inlet and the water outlet of the first-stage superheater are in communication with the steam drum and the second-stage superheater, respectively; the outlet of the second-stage superheater is a main steam pipeline; the water inlets of the pressurized water drainage system are in communication with the second-stage superheater, the first-stage superheater, and the safety valve of the main steam pipeline, respectively, and the water outlet of the pressurized water drainage system is in communication with the regular blowdown expander; the water inlets of the non-pressurized water drainage system are in communication with the steam drum and the main steam safety valve, respectively, and the water outlet of the non-pressurized water drainage system is in communication with the funnel of each layer of the dry quenching boiler; the water inlets of the blowdown system are in communication with the water-cooled wall, the upper evaporator, and the lower evaporator, respectively, and the water outlet of the blowdown system is in communication with the regular blowdown expander; the degassing system is arranged at the second-stage superheater, the first-stage superheater, the upper evaporator, and the lower evaporator, respectively.

[0007] In addition, the dry quenching boiler's water drainage and degassing system provided by the utility model can have the following additional technical features:

[0008] In the technical scheme, the pressurized blow-off water system comprises a secondary superheater blow-off pipeline, a primary superheater blow-off pipeline, a first main steam blow-off water pipeline and a second main steam blow-off water pipeline.

[0009] In the technical scheme, the non-pressurized blow-off water system comprises two drum non-pressurized blow-off pipelines, two safety valve non-pressurized blow-off pipelines and a main steam safety valve non-pressurized blow-off pipeline; the water inlets and outlets of the two drum non-pressurized blow-off pipelines and the two safety valve non-pressurized blow-off pipelines are connected with the drums and the hoppers of the dry quenching boiler; the water inlet and outlet of the main steam safety valve non-pressurized blow-off pipeline are connected with the main steam safety valve and the hoppers of the dry quenching boiler respectively.

[0010] In the technical scheme, the blow-off system comprises a water cooling wall blow-off pipeline, an upper evaporator blow-off pipeline and a lower evaporator blow-off pipeline; the water inlet and outlet of the water cooling wall blow-off pipeline are connected with the water cooling wall and the regular blow-off expander respectively; the water inlets of the upper evaporator blow-off pipeline and the lower evaporator blow-off pipeline are connected with the upper evaporator and the lower evaporator respectively, and the water outlets of the upper evaporator blow-off pipeline and the lower evaporator blow-off pipeline are connected with the water cooling wall blow-off pipeline in communication.

[0011] In the technical scheme, the blow-off system comprises a water cooling wall blow-off pipeline, an upper evaporator blow-off pipeline and a lower evaporator blow-off pipeline; the water inlet and outlet of the water cooling wall blow-off pipeline are connected with the water cooling wall and the regular blow-off expander respectively; the water inlets of the upper evaporator blow-off pipeline and the lower evaporator blow-off pipeline are connected with the upper evaporator and the lower evaporator respectively, and the water outlets of the upper evaporator blow-off pipeline and the lower evaporator blow-off pipeline are connected with the water cooling wall blow-off pipeline in communication.

[0012] In the technical scheme, the pressurized blow-off water system further comprises a low-pressure steam blow-off water pipeline.

[0013] In the technical scheme, the sewage in the hoppers of the dry quenching boiler is sent to the bottom water collecting well of the dry quenching boiler, and the blow-off water of the economizer is connected to the ditch.

[0014] Compared with the prior art, the blow-off water and air release system of the dry quenching boiler has the beneficial effects that:

[0015] 1. The blow-off water is circularly heated by the circular heating system, and the pressurized blow-off water system and the non-pressurized blow-off water system are introduced, so that the blow-off water is flexibly treated according to different pressure conditions, the pressurized blow-off water and the non-pressurized blow-off water are discharged separately, the pressurized blow-off water is prevented from entering the hoppers of the dry quenching boiler, the pressurized steam is prevented from overflowing from the hoppers of the dry quenching boiler, the work of the on-site workers is not affected, the pressurized blow-off water system connected to the regular blow-off expander is separated by the expander and then enters the water collecting well, the steam overflow in the water collecting well is reduced, the stability of the system pressure is ensured, and the safety of the operation of the dry quenching boiler is improved.

[0016] 2. The system recycles the blowdown water, reduces the waste of water resources, and prevents internal fouling through the setting of the blowdown system.

[0017] 3. The steam overflow is reduced, the corrosion of the platform and steel frame of the boiler caused by the steam overflow is indirectly reduced, and the service life of the dry quenching coke boiler is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a structural schematic view of a blowdown water and gas release system of a dry quenching coke boiler of the utility model;

[0019] Fig. 2 is a structural schematic view of a funnel of the utility model;

[0020] Fig. 3 is a structural schematic view of a regular blowdown expander of the utility model;

[0021] The correspondence between the reference signs and the component names in the drawings is as follows: Figs. 1-3

[0022] 10 economizer, 11 steam drum, 12 regular blowdown expander, 13 lower evaporator, 14 upper evaporator, 15 first-stage superheater, 16 second-stage superheater, 17 funnel, 18 water-cooled wall, 19 second-stage superheater blowdown pipeline, 20 first-stage superheater blowdown pipeline, 21 first main steam blowdown water pipeline, 22 second main steam blowdown water pipeline, 23 steam drum non-pressure blowdown pipeline, 24 safety valve non-pressure blowdown pipeline, 25 main steam safety valve non-pressure blowdown pipeline, 26 water-cooled wall blowdown pipeline, 27 upper evaporator blowdown pipeline, 28 lower evaporator blowdown pipeline, 29 straight pipe, 30 valve, 31 elbow pipe, 32 low-pressure steam blowdown water pipeline, 33 first regular blowdown header, 34 second regular blowdown header, 35 main steam pipeline. DETAILED DESCRIPTION

[0023] The utility model is further described below in combination with specific implementation cases and drawings. Figs. 1-3 The utility model is further described below in combination with specific implementation cases and drawings.

[0024] A blowdown water and gas release system of a dry quenching coke boiler, like Figs. 1-3 ​As shown, it comprises: a coal economizer 10, a steam drum 11, a regular blowdown expander 12, a circulating heating system, a pressurized blowdown water system, a non-pressurized blowdown water system, a blowdown system and a gas exhaust system; the circulating heating system comprises a lower evaporator 13, an upper evaporator 14, a first-stage superheater 15 and a second-stage superheater 16; the water inlet and outlet of the lower evaporator 13 and the upper evaporator 14 are connected to the steam drum 11; the water inlet and outlet of the first-stage superheater 15 are connected to the steam drum 11 and the second-stage superheater 16 respectively; the outlet of the second-stage superheater 16 is a main steam pipeline 35; the water inlets of the pressurized blowdown water system are connected to the second-stage superheater 16, the first-stage superheater 15 and a main steam pipeline safety valve respectively, and the water outlet of the pressurized blowdown water system is connected to the regular blowdown expander 12; the water inlets of the non-pressurized blowdown water system are connected to the steam drum 11 and a main steam safety valve respectively, and the water outlet of the non-pressurized blowdown water system is connected to each layer funnel 17 of the dry quenching boiler; the water inlets of the blowdown system are connected to a water-cooled wall 18, the upper evaporator 14 and the lower evaporator 13 respectively, and the water outlet of the blowdown system is connected to the regular blowdown expander 12; the gas exhaust system is arranged at the second-stage superheater 16, the first-stage superheater 15, the upper evaporator 14 and the lower evaporator 13 respectively.

[0025] With the above structure, the blowdown water is circularly heated by the circulating heating system, and the pressurized blowdown water system and the non-pressurized blowdown water system are introduced, so that the blowdown water is flexibly treated according to different pressure conditions, the pressurized blowdown water and the non-pressurized blowdown water are discharged separately, thus avoiding the pressurized blowdown water from entering each layer funnel 17 of the dry quenching boiler, so that the pressurized steam cannot overflow from each layer funnel 17 of the dry quenching boiler, thereby avoiding the influence on the work of the site staff, and the pressurized blowdown water system connected to the regular blowdown expander is expanded and separated by the expander and then enters a collecting well, so that the steam overflow in the collecting well is reduced, the stability of the pressure in the system is ensured, and the safety of the operation of the dry quenching boiler is improved.

[0026] Specifically, the circulating heating system comprises primary, secondary and tertiary circular heating, the primary circular heating is that the water in the steam drum 11 enters the lower evaporator 13 for heat exchange and then returns to the steam drum 11, the secondary circular heating is that the water in the steam drum 11 enters the upper evaporator 14 for heat exchange and then returns to the steam drum 11, and the tertiary circular heating is that the water in the steam drum 11 enters the first-stage superheater 15 for heat exchange and then enters the second-stage superheater 16.

[0027] The system circularly utilizes the blowdown water, reduces the waste of water resources, and prevents internal fouling through the arrangement of the blowdown system.

[0028] By reducing the steam overflow, the corrosion of the platform and steel frame of the boiler caused by the steam overflow is indirectly reduced, and the service life of the dry quenching boiler is prolonged.

[0029] Specifically, the two unpressurized drain pipes 23 are respectively connected with the double-color water level gauge and the electrolytic point liquid level gauge, so that the working state of the steam drum can be grasped in real time, potential problems can be found and solved in time, and the normal operation of the system can be ensured.

[0030] In the embodiment of the utility model, as shown in Figs. 1-3 The pressure drainage system comprises a secondary superheater drain pipeline 19, a primary superheater drain pipeline 20, a first main steam drain pipeline 21 and a second main steam drain pipeline 22.

[0031] The secondary superheater drain pipeline 19, the primary superheater drain pipeline 20, the first main steam drain pipeline 21 and the second main steam drain pipeline 22 are all connected with the first fixed discharge header 33 and enter the regular blowdown expander 12 through the first fixed discharge header 33, so that the sewage in the primary superheater 15, the secondary superheater 16 and the main steam pipeline 35 is uniformly collected into the first fixed discharge header 33, enters the regular blowdown expander 12 for expansion and separation, and is then discharged into the water collecting well, so that the purpose of reducing steam overflow of the water collecting well is achieved.

[0032] In the embodiment of the utility model, as shown in Figs. 1-3 The unpressurized drainage system comprises two steam drum unpressurized drain pipes 23, two safety valve unpressurized drain pipes 24 and a main steam safety valve unpressurized drain pipe 25; the water inlets and outlets of the two steam drum unpressurized drain pipes 23 and the two safety valve unpressurized drain pipes 24 are connected with the steam drum 11 and the dry quenching boiler funnel 17; and the water inlet and outlet of the main steam safety valve unpressurized drain pipe 25 are connected with the main steam safety valve and the dry quenching boiler funnel 17.

[0033] The steam drum unpressurized drain pipe 23, the safety valve unpressurized drain pipe 24 and the main steam safety valve unpressurized drain pipe 25 are used in combination, so that the unpressurized sewage of the steam drum 11, the unpressurized sewage of the safety valve and the unpressurized sewage in the dry quenching boiler circulating heating system are respectively flowed into the dry quenching boiler funnel 17 and then flowed into the bottom water collecting well.

[0034] In the embodiment of the utility model, as shown in Figs. 1-3 The blowdown system comprises a water cooling wall blowdown pipeline 26, an upper evaporator blowdown pipeline 27 and a lower evaporator blowdown pipeline 28; the water inlet and outlet of the water cooling wall blowdown pipeline 26 are connected with the water cooling wall 18 and the regular blowdown expander 12; the water inlets of the upper evaporator blowdown pipeline 27 and the lower evaporator blowdown pipeline 28 are connected with the upper evaporator 14 and the lower evaporator 13, and the water outlets of the upper evaporator blowdown pipeline 27 and the lower evaporator blowdown pipeline 28 are all connected with the water cooling wall blowdown pipeline 26.

[0035] The dirty water in the water cooling wall 18, the upper evaporator 14 and the lower evaporator 13 is collected into the second fixed discharge header 34 through the water cooling wall blowdown pipe 26, the upper evaporator blowdown pipe 27 and the lower evaporator blowdown pipe 28 respectively, and enters the regular blowdown expander 12 through the second fixed discharge header 34, so as to prevent the internal scaling of the dry quenching boiler.

[0036] In the embodiment of the utility model, as shown in ​ The air release system comprises four air release mechanisms, and the four air release mechanisms are arranged at the upper evaporator 14, the lower evaporator 13, the first superheater 15 and the second superheater 16 respectively, and each air release mechanism comprises a straight pipe 29, a valve 30 and an elbow pipe 31.

[0037] The air release mechanisms arranged at the upper evaporator 14, the lower evaporator 13, the first superheater 15 and the second superheater 16 release non-condensable gases, so as to maintain the pressure stability in the system.

[0038] In the embodiment of the utility model, the pressurized water drainage system further comprises a low-pressure steam drainage pipe 32.

[0039] The low-pressure steam drainage pipe 32 is used to inject low-pressure steam drainage into the regular blowdown expander.

[0040] In the embodiment of the utility model, the dirty water in each layer funnel 17 of the dry quenching boiler is sent to a dry quenching boiler bottom layer collecting well, and the drainage of the economizer 10 is connected to a ditch.

[0041] Implementation process: The drainage is circularly heated through the circular heating system, and the pressurized drainage system and the non-pressurized drainage system are introduced, the drainage is flexibly treated according to different pressure conditions, the pressurized drainage and the non-pressurized drainage are discharged separately, so as to avoid the pressurized drainage from entering each layer funnel 17 of the dry quenching boiler, so that the pressurized steam cannot overflow from each layer funnel 17 of the dry quenching boiler, so as to avoid affecting the work of the on-site staff, and the pressurized drainage system connected to the regular blowdown expander after expansion and separation through the expander enters the collecting well, so as to reduce the steam overflow in the collecting well, ensure the stability of the pressure in the system, and further improve the safety of the operation of the entire dry quenching boiler. By reducing the steam overflow, the corrosion of the platform and the steel frame of the boiler caused by the steam overflow is indirectly reduced, and the service life of the dry quenching boiler is prolonged.

[0042] In the description of the utility model, the term "a plurality of" refers to two or more than two, unless otherwise expressly limited, the term "up", "down" and the like indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the device or element must have a particular orientation, with a particular orientation and operation, therefore, can not be understood as a limitation on the utility model;The terms "connection", "installation", "fixing" and the like should be understood broadly, for example, "connection" can be fixedly connected, can also be detachably connected, or integrally connected;It can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0043] In the description of the utility model, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the utility model, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A blowdown water and gas system for a dry quenching boiler, characterized in that The utility model relates to a circulating fluidized bed boiler system, comprising: a coal economizer, a steam drum, a regular blowdown expander, a circulating heating system, a pressurized blowdown water system, a non-pressure blowdown water system, a blowdown system and a gas release system; the circulating heating system comprises a lower evaporator, an upper evaporator, a first superheater and a second superheater; the water inlets and outlets of the lower evaporator and the upper evaporator are connected with the steam drum; the water inlets and outlets of the first superheater are connected with the steam drum and the second superheater respectively; and the outlet of the second superheater is a main steam pipeline; the water inlets of the pressurized blowdown water system are connected with the second superheater, the first superheater and a safety valve of the main steam pipeline respectively, and the water outlet of the pressurized blowdown water system is connected with the regular blowdown expander; the water inlets of the non-pressure blowdown water system are connected with the steam drum and a safety valve of the main steam respectively, and the water outlet of the non-pressure blowdown water system is connected with each layer funnel of the dry quenching coke boiler; the water inlets of the blowdown system are connected with a water-cooled wall, the upper evaporator and the lower evaporator respectively, and the water outlet of the blowdown system is connected with the regular blowdown expander; a gas release system is arranged at the second superheater, the first superheater, the upper evaporator and the lower evaporator respectively.

2. A system for draining water and gas from a dry quenching boiler according to claim 1, characterized in that, the pressurized blowdown water system comprises a second superheater blowdown pipeline, a first superheater blowdown pipeline, a first main steam blowdown water pipeline and a second main steam blowdown water pipeline.

3. A system for draining water and gas from a dry quenching boiler according to claim 2, characterized in that the non-pressure blowdown water system comprises two steam drum non-pressure blowdown pipelines, two safety valve non-pressure blowdown pipelines and a main steam safety valve non-pressure blowdown pipeline; the water inlets and outlets of the two steam drum non-pressure blowdown pipelines and the two safety valve non-pressure blowdown pipelines are connected with the steam drum and each layer funnel of the dry quenching coke boiler; and the water inlets and outlets of the main steam safety valve non-pressure blowdown pipeline are connected with the safety valve of the main steam and each layer funnel of the dry quenching coke boiler respectively.

4. A system for draining water and gas from a dry quenching boiler according to claim 3, characterized in that the blowdown system comprises a water-cooled wall blowdown pipeline, an upper evaporator blowdown pipeline and a lower evaporator blowdown pipeline; the water inlets and outlets of the water-cooled wall blowdown pipeline are connected with the water-cooled wall and the regular blowdown expander respectively; the water inlets of the upper evaporator blowdown pipeline and the lower evaporator blowdown pipeline are connected with the upper evaporator and the lower evaporator respectively, and the water outlets of the upper evaporator blowdown pipeline and the lower evaporator blowdown pipeline are connected with the water-cooled wall blowdown pipeline.

5. A system for draining water and gas from a dry quenching boiler according to claim 4, characterized in that the gas release system comprises four gas release mechanisms; the four gas release mechanisms are arranged at the upper evaporator, the lower evaporator, the first superheater and the second superheater respectively, and each gas release mechanism comprises a straight pipe, a valve and an elbow pipe.

6. A system for draining water and gas from a dry quenching boiler according to claim 5, characterized in that the pressurized blowdown water system further comprises a low-pressure steam blowdown water pipeline.

7. A system for draining water and gas from a dry quenching boiler according to claim 6, characterized in that the sewage in each layer funnel of the dry quenching coke boiler is sent to a dry quenching coke boiler bottom layer collecting well, and the blowdown of the coal economizer is connected to a ditch.

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