CN220418133U - Semi-dry bypass ventilation system - Google Patents

Abstract

The utility model relates to a semi-dry bypass air release system which comprises a water-cooling spray tower, a dust collector, an exhaust fan and a terminal smoke exhaust device, wherein the water-cooling spray tower is used for quenching high-temperature smoke and separating coarse particle dust, the dust collector is used for separating dust in smoke, the exhaust fan is used for providing system operation power, the terminal smoke exhaust device is sequentially arranged along a bypass high-temperature smoke treatment path, an air inlet of the water-cooling spray tower is connected with a kiln tail smoke chamber, a coarse dust conveying device is arranged at the bottom of the water-cooling spray tower, coarse dust at the bottom of the water-cooling spray tower enters a kiln bucket elevator through the coarse dust conveying device and returns to a cement kiln, and a fine dust conveying device is arranged at the bottom of the dust collector. The utility model relieves the skinning risk of the cement kiln system, realizes coarse ash separation, reduces the consumption of dry powder desulfurizing agent, reduces the operation cost of subsequent water salt elution, and has the advantages of small occupied area, investment saving, fast construction, stable operation and low power consumption.

Description

Semi-dry bypass ventilation system

Technical Field

The utility model relates to the field of cement kiln co-treatment of alternative fuels, in particular to a semi-dry bypass air release system.

Background

With the rapid development of urban process and national economy, the production of municipal domestic waste, hazardous waste, general industrial solid waste and the like is gradually increased, and meanwhile, the traditional fuel resources are increasingly tense, so that the environmental protection requirement is more and more strict. However, as the amount of the alternative fuel to be burned increases, the amount of volatile harmful components such as alkali, sulfur, chlorine, etc. entering the cement kiln system increases accordingly. The volatile components are circularly enriched in the cement kiln system, so that the skinning and the blockage of the preheater system are caused, the normal operation of the cement kiln system is influenced, and the quality of clinker is threatened. Therefore, the circulating enrichment of the volatile harmful components needs to be reduced, so a bypass ventilation system is adopted to discharge a certain amount of high-temperature flue gas rich in the volatile harmful components from a kiln tail flue gas chamber to the outside of the cement kiln system.

Conventional bypass bleed system flow: and extracting a certain amount of high-temperature smoke from a kiln tail smoke chamber, cooling to about 200 ℃ through water cooling, air cooling or a heat exchanger, purifying through a bag type dust collector, and finally discharging to a chimney through an exhaust fan for emission. In order to take away dust, the upstream water cooling must ensure a certain wind speed, and under the condition of a certain air release proportion, the inner diameter of an upstream air pipe is smaller for a cement kiln with low yield, and the spraying can cause wet walls to cause skinning so as to influence the stable operation of a bypass air release system; the air cooling floor area is large, the investment is high, the construction is slow, and the running power consumption is high.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a semi-dry bypass ventilation system, which relieves the skinning risk of a cement kiln system, realizes coarse ash, reduces the use amount of a dry powder desulfurizing agent and reduces the operation cost of subsequent water salt elution.

The technical scheme adopted for solving the technical problems is as follows: the semi-dry bypass air release system comprises a water-cooling spray tower, a dust collector, an exhaust fan and a terminal smoke exhaust device, wherein the water-cooling spray tower is used for quenching high-temperature smoke and separating coarse particle dust, the dust collector is used for separating dust in smoke, the exhaust fan is used for providing system operation power, the terminal smoke exhaust device is used for providing system operation power, the air inlet of the water-cooling spray tower is connected with a kiln tail smoke chamber, a coarse ash conveying device is arranged at the bottom of the water-cooling spray tower, coarse ash at the bottom of the water-cooling spray tower enters a kiln bucket elevator through the coarse ash conveying device and returns to a cement kiln, and a fine ash conveying device is arranged at the bottom of the dust collector.

According to the scheme, a high-temperature gate valve is arranged between the kiln tail smoke chamber and the water-cooling spray tower.

According to the scheme, an automatic spray cooling system is arranged at the middle upper part of the water-cooling spray tower.

According to the scheme, the terminal smoke exhaust device comprises a smoke exhaust valve and a kiln tail chimney.

According to the scheme, the exhaust fan is a high-temperature centrifugal fan.

According to the scheme, the dust collector is a dry dust collector, and the filter material in the dust collector is a filter bag, a ceramic tube or a plastic plate.

According to the scheme, the inlet and the outlet of the water-cooling spray tower are respectively provided with a temperature sensor and a pressure sensor.

According to the scheme, the automatic spray cooling system adopts a double-fluid spray gun.

The working principle of the utility model is as follows:

during operation, the high-temperature gate valve and the smoke exhaust valve are opened at first, then a certain amount of high-temperature smoke (the smoke temperature is 1000-1250 ℃) is extracted from a smoke chamber at the tail of the kiln through the high-temperature centrifugal fan, the smoke enters the water-cooling spray tower, the automatic spray cooling system starts to spray and cool after detecting signals transmitted by the sensor, the high-temperature smoke is quenched to 220-260 ℃, a part of coarse particle dust can be settled to the bottom of the tower, the coarse particle dust is transported to the kiln bucket elevator by the conveying equipment to enter the cement kiln for dry desulfurization, then the high-temperature smoke from the tower enters the dry dust collector for dust separation again, the separated fine particle dust is metered and conveyed to the subsequent water-washing salt-stripping process, and finally the smoke from the dust collector is discharged through the kiln tail chimney.

The semi-dry bypass ventilation system has the following beneficial effects:

the utility model utilizes the downstream water cooling to realize the separation of the low temperature and coarse particles, solves the defects of wet wall, crust and the like when the upstream water cooling runs on the cement kiln with low yield, simultaneously realizes the separation of the coarse ash, saves the consumption of dry powder desulfurizing agent, reduces the running cost of subsequent water salt stripping, effectively discharges volatile harmful elements such as alkali, sulfur, chlorine and the like, ensures the stable running of a cement kiln system, has small occupied area, saves investment, fast construction, stable running and low electricity consumption, and is suitable for the later reconstruction of cement factories for cooperatively disposing alternative fuels.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structure view of a semi-dry bypass ventilation system according to the present utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.

As shown in fig. 1, the semi-dry bypass ventilation system comprises a water-cooling spray tower 3 for quenching high-temperature flue gas and separating coarse particle dust, a coarse dust conveying device 5 arranged at the bottom of the water-cooling spray tower 3, a dust collector 6 for separating dust in the flue gas, a fine dust conveying device 7 arranged at the bottom of the dust collector 6, an exhaust fan 8 for providing system operation power and terminal smoke exhaust equipment, which are sequentially arranged along a bypass high-temperature flue gas treatment path. The air inlet of the water-cooling spray tower 3 is connected into the kiln tail smoke chamber 1, an automatic spray cooling system is arranged at the upper part of the water-cooling spray tower 3, and coarse ash enters the kiln bucket elevator through the coarse ash conveying device 5 and returns to the cement kiln. The fine ash conveyed by the fine ash conveying device 7 can be used for the subsequent water-washing salt-leaching process.

Preferably, the terminal smoke exhaust equipment comprises a smoke exhaust pipeline, a smoke exhaust valve 9 and a kiln tail chimney 10 which are sequentially arranged along a smoke exhaust path, wherein the smoke exhaust chimney is not newly added, and meanwhile, the terminal smoke exhaust equipment is subjected to on-line monitoring and supervision of the kiln tail.

Preferably, the air inlet of the water-cooling spray tower 3 is connected into the kiln tail smoke chamber 1 through an air inlet pipeline, the high-temperature gate valve 2 is arranged in the middle, and the air inlet pipeline is obliquely arranged in the front of the kiln tail smoke chamber or in the front of the two sides, namely in the direction close to the kiln head.

Preferably, the dust collector 6 is a dry dust collector of filter material such as a filter bag, a ceramic tube, a plastic-sintered plate, or the like.

Preferably, the automatic spray cooling system 4 is software automatic regulation and control, and the inlet and outlet of the water-cooling spray tower 3 are provided with temperature sensors and pressure sensors.

Preferably, the automatic spray cooling system 4 employs a two-fluid spray gun.

Preferably, the water-cooled spray tower 3 can separate coarse dust, and coarse dust at the bottom of the water-cooled spray tower enters a kiln bucket elevator as a dry powder desulfurizing agent through the coarse dust conveying device 5 to return to the cement kiln.

Preferably, the exhaust fan 8 is a high temperature centrifugal fan.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims (8)

1. The semi-dry bypass air release system is characterized by comprising a water-cooling spray tower, a dust collector, an exhaust fan and a terminal smoke exhaust device, wherein the water-cooling spray tower is used for quenching high-temperature smoke and separating coarse particle dust, the dust collector is used for separating dust in smoke, the exhaust fan is used for providing system operation power, the terminal smoke exhaust device is sequentially arranged along a bypass high-temperature smoke treatment path, an air inlet of the water-cooling spray tower is connected with a kiln tail smoke chamber, a coarse ash conveying device is arranged at the bottom of the water-cooling spray tower, coarse ash at the bottom of the water-cooling spray tower enters a kiln bucket elevator through the coarse ash conveying device and returns to a cement kiln, and a fine ash conveying device is arranged at the bottom of the dust collector.

2. The semi-dry bypass ventilation system according to claim 1, wherein a high temperature gate valve is provided between the kiln tail flue gas chamber and the water-cooled spray tower.

3. The semi-dry bypass ventilation system according to claim 1, wherein an automatic spray cooling system is provided at a middle upper portion of the water-cooled spray tower.

4. The semi-dry bypass ventilation system of claim 1, wherein the terminal fume exhaust means comprises a fume exhaust valve and a kiln tail stack.

5. The semi-dry bypass ventilation system of claim 1, wherein the exhaust fan is a high temperature centrifugal fan.

6. The semi-dry bypass ventilation system according to claim 1, wherein the dust collector is a dry dust collector, and the filter material inside the dust collector is a filter bag, a ceramic tube or a plastic-sintered plate.

7. The semi-dry bypass ventilation system according to claim 1, wherein the water-cooled spray tower inlet and outlet are provided with a temperature sensor and a pressure sensor.

8. A semi-dry bypass ventilation system as claimed in claim 3, wherein said automatic spray cooling system employs a two-fluid spray gun.