CN212025274U

CN212025274U - Lurgi slag bath buck sedimentation purification treatment system

Info

Publication number: CN212025274U
Application number: CN202020540402.1U
Authority: CN
Inventors: 宋育勇; 崔廷政; 程海峰; 王海兵; 伏彦军; 陈玉明; 姜成鹏; 李恒
Original assignee: Xinjiang Guanghui New Energy Co ltd
Current assignee: Xinjiang Guanghui New Energy Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-11-27
Anticipated expiration: 2030-04-14

Abstract

The utility model discloses a Lurgi slag bath ash water sedimentation and purification treatment system, which comprises a gasification furnace, wherein the bottom of the gasification furnace is connected with a vertical ash pipe through an ash lock, and the lower part of the vertical ash pipe extends into a slag runner; a heat exchange water pipe is arranged in the ash erecting pipe, and is provided with a cold water inlet and a hot water outlet; the utility model has the advantages that: the ash slag forms tightness in the slag runner, the filtering area is increased, the ash steam generation amount is reduced, and the ash slag settling time in the ash water is prolonged, so that the content of the discharged ash steam dust is reduced, the cleanness of the ash water is improved, the energy is saved, the consumption is reduced, and the emission standard is reached.

Description

Lurgi slag bath buck sedimentation purification treatment system

Technical Field

The utility model relates to a purification treatment device is subsided to buck, specifically speaking are purification treatment system is subsided to lurgi slag bath buck belongs to the buck and subsides the purification treatment field.

Background

The Lurgi furnace has the production characteristics of Lurgi pressurization, countercurrent contact, continuous gasification and solid slag discharge. Through a heat detection experiment, the unit heat of the Lurgi furnace ash powder is measured to be 1.2kJ/kg DEG C, the particle size of the ash powder is analyzed, and the particle size of the ash powder is found to be 70% distributed in the range of 0-25mm and only 30% of the particle size of 30-100mm, so that the ash powder has smaller particle size and is difficult to settle; through the analysis of the main component of the ash, the main component is SiO₂、Fe₂O₃、Al₂O₃They all account for about 20-40%. The ash and slag discharged from the Lurgi furnace fall into a slag runner with a certain gradient through an ash erecting pipe, and the slag in the slag runner is flushed into a slag pool by high-pressure water sprayed by a torrent nozzle. The existing vertical ash pipe is long, most of the existing vertical ash pipe is difficult to realize that ash steam cannot be washed by high-pressure water, so that the heat exchange efficiency is seriously influenced, and the existing vertical ash pipe has the defects that the ash steam cannot be timely pumped out by a dust removal fan, the energy consumption is high, and the working condition of personnel is poor. The sedimentation of the ash water in the slag pool is difficult, the operation period of a slurry pump is shortened, and ash locking equipment is blocked by ash slag. How to further improve, perfect and unify the efficient and environment-friendly utilization of ash steam is still a problem which cannot be ignored in the development process of the Lurgi furnace solid-state slagging technology.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model discloses a lurgi slag bath buck subsides purification treatment system, the lime-ash forms the leakproofness at the slag runner, increases filter area, reduces ash steam production volume, and ash settling time in the extension grey water to the ash steam dust content is arranged in the reduction, improves grey water cleanliness energy saving and consumption reduction, reaches emission standard.

The technical scheme of the utility model is that:

the Lurgi slag pool grey water sedimentation and purification treatment system comprises a gasification furnace, wherein the bottom of the gasification furnace is connected with a vertical ash pipe through an ash lock, and the lower part of the vertical ash pipe extends into a slag runner, so that ash powder is fully mixed with water, the ash powder is prevented from being discharged into the atmospheric environment, and part of grey water vapor can be reused;

the vertical ash pipe is internally provided with a heat exchange water pipe, the heat exchange water pipe is provided with a cold water inlet and a hot water outlet, and the heat carried by the hot ash is recycled through an additional heat exchange device, so that the heat utilization efficiency is improved.

The slag runner is communicated with the slag tank, the slag tank is provided with a grey-water separation tank, the grey-water separation tank is provided with a separation partition wall, so that grey water overflows according to an S-shaped route, the retention time of the grey water in the separation tank is increased, and the ash powder is settled by 100%.

The tail end of the slag pool is connected with a water outlet pipe through a slag slurry pump, the water outlet pipe is provided with a spraying and washing device such as a nozzle, and the nozzle is arranged at the end part of the slag runner and used for washing away ash and slag from the vertical ash pipe.

And ash water filter pressing equipment is arranged on the side of the slag pool, fine ash in the ash water is filter-pressed into a filter cake, and part of large-particle ash slag is filtered to prevent the subsequent ash conveying water pump from being blocked.

The upper near-end of the slag pool is also communicated with an exhaust fan through a pipeline, so that ash steam which is not washed or evaporated is extracted by the fan.

The vertical ash pipe and washing water form a sealing mode in the slag ditch, high-pressure water sprayed by the torrent nozzle discharges ash slag from the gasification furnace to form water seal, ash steam is washed by water and is flushed into the slag settling tank along with the ash slag, and part of the ash steam which is not washed by water or evaporated is pumped out by the fan.

The spray flushing device is additionally arranged on the vertical pipe of each ash steam pipeline, spray flushing water is additionally arranged through the ash steam pipeline, the washing and filtering area is increased, and the dust amount of the ash steam is reduced.

A slag basin ash blocking wall and a slag baffle wall are arranged in the slag basin of the gasification area, and the flowing direction of the ash water is changed, so that the ash water overflows in an S-shaped route in the slag basin.

The utility model has the advantages that: the stable operation of the gasification furnace is ensured; the heat recovery of Lurgi furnace ash powder reaches more than 90 percent, so that the heat utilization rate is improved by 20 percent compared with the prior art; the shock resistance of the vertical ash pipeline is effectively improved, and the service life of the vertical ash pipeline can be prolonged by more than 2 years; the ash content of the grey water is reduced to 30mg/ml, and is expected to be further reduced to below 20 mg/ml.

The present invention will be further explained with reference to the drawings and examples.

Drawings

Fig. 1 is a schematic structural diagram of a lurgi slag pool grey water sedimentation and purification treatment system in the embodiment of the utility model.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is not intended to limit the invention.

Example 1

As shown in fig. 1, the lurgi slag pool grey water sedimentation and purification treatment system comprises a gasification furnace 1, wherein the bottom of the gasification furnace 1 is connected with a vertical ash pipe 3 through an ash lock 2, and the lower part of the vertical ash pipe 3 extends into a slag runner 4, so that ash powder is fully mixed with water, the ash powder is prevented from being discharged into the atmospheric environment, and part of grey water vapor can be reused; the top and the bottom of the gasification furnace 1 are connected with a coal bunker 12 through a coal lock 11

The vertical ash pipe 3 is internally provided with a heat exchange water pipe 5, the heat exchange water pipe 5 is provided with a cold water inlet and a hot water outlet, and the heat carried by the hot ash is recycled through an additional heat exchange device, so that the heat utilization efficiency is improved.

The slag runner 4 is communicated with a slag pool 6, the slag pool 6 is provided with a grey-water separation pool, the grey-water separation pool is provided with a separation partition wall 61, so that grey water overflows according to an S-shaped route, the retention time of the grey water in the separation pool is increased, and the ash powder is settled by 100%.

The tail end of the slag pool 6 is connected with a water outlet pipe through a slag slurry water pump 7, the water outlet pipe is provided with a spraying and washing device such as a nozzle, and the nozzle is arranged at the end part of the slag runner 4 and used for washing away ash from the vertical ash pipe 3.

And an ash water filter pressing device 8 is arranged on the side of the slag pool 6, and is used for filter-pressing fine ash in ash water into a filter cake, and filtering part of large-particle ash slag to prevent the subsequent ash conveying water pump from being blocked.

The upper near-end of the slag pool 6 is also communicated with an exhaust fan 9 through a pipeline, so that ash steam which is not washed or evaporated is extracted by the fan.

The vertical ash pipe and washing water form a sealing mode in the slag channel and extend to 400mm away from the cast iron groove. The high-pressure water sprayed by the torrent nozzle discharges ash from the gasification furnace to form water seal, ash steam is washed by water and is flushed into the slag settling tank along with the ash, and part of the ash steam which is not washed by water or evaporated is pumped out by the fan.

The phi 25 spraying and flushing device is additionally arranged on the vertical pipe of each ash steam pipeline, spraying and flushing water is additionally arranged through the ash steam pipeline, the washing and filtering area is increased, and the dust amount of the ash steam is reduced.

The partition wall in the slag settling tank in the gasification area is raised by about 1m and is used as an ash blocking wall of the slag settling tank. And a baffling wall is arranged to change the flowing direction of the grey water so that the grey water overflows in an S-shaped route in the slag pool.

The gasification furnace 1 is a Lurgi furnace, the bottom of the Lurgi furnace is provided with a Lurgi furnace ash outlet which is communicated with an ash inlet of a heat exchange device, a condensed water pipeline is arranged in the heat exchange device to pass through, the condensed water exchanges heat with hot ash from the Lurgi furnace ash outlet to recover heat for recycling, the heat exchange device is provided with an ash outlet, the ash in the heat exchange device automatically reaches a vertical ash pipe under the action of gravity, the ash outlet is communicated with the upper end of the vertical ash pipe, the vertical ash pipe is vertically arranged, the lower end of the vertical ash pipe extends into a U-shaped iron casting groove, the bottom of the U-shaped iron casting groove forms a slag runner with a certain gradient, and an ash lock (the ash lock is arranged at the bottom of the gasification furnace and is connected with a flange of the gasification furnace through a slag slurry pump to form an upper and lower valve and an ash lock circulating system), used for collecting ash) to the bottom of a slag pool (provided with a slag runner and a cast iron groove laid at the bottom of the slag runner to prevent scouring). After the hot ash is changed into cold ash, the cold ash passes through an ash inlet of the vertical ash pipe, passes through an ash lock arranged at the bottom of a lower cone of the gasification furnace (Lurgi gasifier) and at the upper part of the heat exchange device, and is discharged out, and then is mixed with washing water (ash water washing) in a slag runner; alloy high-temperature-resistant, corrosion-resistant and scouring-resistant materials are combined with other materials to form a sealing mode, the sealing mode is prolonged to be arranged in a position 400mm away from a U-shaped iron casting groove (paved at the bottom of a slag runner) in the slag runner, and the sealing mode is discharged to the slag runner; the heat is discharged by utilizing ash steam after the heat exchange between the hot ash and the condensed water, a large amount of heat is recovered, and the cold ash is discharged to a slag runner by utilizing an ash erecting pipe.

The bottom of the Lurgi furnace is provided with a Lurgi furnace ash outlet which is communicated with the upper end of a vertical ash pipe, the vertical ash pipe is vertically arranged, the lower end of the vertical ash pipe extends into a slag pool, and the bottom of the slag pool forms a slag channel with a certain gradient;

one end of the slag pool is provided with a cooling water inlet which is connected with a cooling water pipeline, the other end of the slag pool is provided with an ash water outlet, and the ash water outlet is provided with a cake-shaped filter cake which is sent to a coal preparation device to be mixed into raw coal for incineration in order to meet the environmental protection requirement; the ash water outlet is communicated with an ash water separation tank, and the ash water in the slag tank is separated by the ash water separation tank; the clear water tank in the slag pool is provided with a 3180mm (height) partition wall for settling fine ash in the ash water; and a partition wall is also arranged in the ash-water separation tank, the height of the partition wall is about 1m, and the partition wall is used as an ash blocking wall of a slag settling tank. The ash-water separation tank is also connected with the slag tank pipeline through a circulating pipeline and is provided with a circulating pump, the ash water is clarified again after separation, the clarified ash water is recycled, and the wet ash is treated again by a cake pressing device.

The torrent nozzle is arranged beside a vertical ash pipe from an ash-water pipeline at the outlet of the slurry pump to a single gasification furnace, slag flushing water is sprayed out from the torrent nozzle in an inner bell mouth, the sprayed high-pressure water forms water seal with ash and slag discharged from the Lurgi gasification furnace, ash steam is washed by water and flushed into a sediment tank area of the ash-water separation tank along with the ash and slag;

the slag runner is characterized in that an ash steam pipeline is arranged at the top of the slag runner and is connected with a spraying and flushing device through a centrifugal fan, part of ash steam which is not washed or evaporated is pumped to an impact type device through 5 centrifugal fans and is discharged to the atmosphere after being washed by spraying and flushing water, and a phi 25 spraying and flushing device is additionally arranged on a vertical pipe of each ash steam pipeline, so that the washing and filtering area is increased, and the dust amount of the ash steam is reduced.

The partition wall in the slag settling tank in the gasification area is raised by about 1m and is used as an ash blocking wall of the slag settling tank.

The overflow weirs of two overflow walls of the clarification tank and the clean water tank are respectively increased by about 0.5m and increased by about 14mm to be used as baffle walls.

The flowing direction of the grey water is changed, so that the grey water overflows in an S-shaped path in the inner process of the slag pool, the passing distance of water flow is increased, the retention time of the grey water in the sedimentation pool is prolonged, and the purposes of naturally settling the grey water and improving the quality of the grey water are achieved.

Claims

1. Lurgi slag bath buck subsides purification treatment system, its characterized in that: the device comprises a gasification furnace, wherein the bottom of the gasification furnace is connected with a vertical ash pipe through an ash lock, and the lower part of the vertical ash pipe extends into a slag runner; the vertical ash pipe is internally provided with a heat exchange water pipe, and the heat exchange water pipe is provided with a cold water inlet and a hot water outlet.

2. The lurgi slag bath grey water sedimentation purification treatment system of claim 1, wherein: the slag runner is communicated with the slag tank, the slag tank is provided with a grey-water separation tank, and the grey-water separation tank is provided with a separation partition wall.

3. The lurgi slag bath grey water sedimentation purification treatment system of claim 2, wherein: the tail end of the slag pool is connected with a water outlet pipe through a slag slurry pump, the water outlet pipe is provided with a spraying and flushing device, and the spraying and flushing device is arranged at the end part of the slag runner.

4. The lurgi slag bath grey water sedimentation purification treatment system of claim 3, wherein: and ash water filter pressing equipment is arranged on the side of the slag pool.

5. The lurgi slag bath grey water sedimentation purification treatment system of claim 4, wherein: the upper near-end of the slag pool is also communicated with an exhaust fan through a pipeline.