WO2012116533A1

WO2012116533A1 - Apparatus and system for cleaning cracking furnace burnt gas and recovering heat energy and material

Info

Publication number: WO2012116533A1
Application number: PCT/CN2011/076834
Authority: WO
Inventors: 李树生
Original assignee: Li Shusheng
Priority date: 2011-03-03
Filing date: 2011-07-04
Publication date: 2012-09-07
Also published as: CN202155064U

Abstract

Disclosed are an apparatus for cleaning cracking furnace burnt gas and recovering heat energy and materials, and a system for cleaning cracking furnace burnt gas and recovering heat energy and materials. The recovery system comprises a burnt gas pipe (1), a low-temperature desalted water pipe (2), a high-temperature desalted water pipe (3), a recovery apparatus (4) and a boiler water deaerator. The recovery apparatus comprises a tank, in which a heat absorbing tube (12), and a water inlet pipe and a water outlet pipe communicating with the heat absorbing tube are disposed, on which a gas inlet pipe (5) and a gas outlet pipe (6) communicating with an inner cavity of the tank are disposed, and at a bottom of which, a solid-liquid material outlet (7) is disposed, wherein the gas inlet pipe (5) is connected to the burnt gas pipe (1), the water outlet pipe is connected to the deaerator via the high-temperature desalted water pipe (3), and the water inlet pipe is connected to the low-temperature desalted water pipe (2).

Description

Pyrolysis furnace burnt steam purification and thermal energy and material recovery equipment and recovery system

Technical field

The invention relates to a pyrolysis steam burning and heat energy and material recovery equipment for cracking furnace, and to a pyrolysis steam burning and heat energy and material recovery equipment and system using the above-mentioned recycling equipment, which is mainly used for cracking furnace waste steam. Recycling of heat and other energy sources.

Background technique

The cracking furnace is an important process equipment for the production of ethylene and other products. At present, the ethylene cracking furnace at home and abroad still uses the charred tank, and the waste steam is discharged from the empty tank. The cracking furnace is generally shut down once every 35-50 days for a 24-hour cracking furnace to burn steam. When scorching, the air is used in the hundreds to thousands of cubic meters per hour, and the steam consumption is several tons to several tens of tons. The heat recovery (waste furnace) and the cooling temperature are still 120-500 degrees, and the exhaust steam is large. Serious environmental pollution has also caused waste of heat.

Summary of the invention

In order to overcome the above-mentioned drawbacks of the prior art, the present invention provides a novel pyrolysis steam burning and heat energy and material recovery equipment for a cracking furnace and a recovery system using the same, which aims to coke steam through a cracking furnace. The four-phase flow is separated, and the heat energy and water resources are recycled and utilized.

The technical solution adopted by the invention is:

A cracking furnace scorch steam purification and heat energy and material recovery equipment, comprising a scorch steam pipe, a low temperature desalinated water pipe, a high temperature desalinated water pipe, a recovery device and a boiler water deaerator, wherein the recovery device comprises a tank body, a heat absorption tube and a water inlet connecting the heat absorption tube are provided in the tank body a tube and an outlet pipe, the tank body is provided with an inlet pipe and an exhaust pipe connected to the inner cavity thereof, the bottom end of the tank body is provided with a solid-liquid material outlet, and the outer end of the inlet pipe is connected to the a scorch steam pipe, the outer end of the water outlet pipe is connected to the deaerator through the high temperature desalted water pipe, the outer end of the water inlet pipe is connected to the low temperature desalted water pipe, and the inlet pipe is provided with an opening degree The regulating valve is provided with a temperature sensor, and the opening adjusting valve is electrically connected to the temperature sensor.

The solid-liquid material outlet may be provided with a detachable material recovery bag that is permeable to water and permeable to solid materials.

Preferably, an outlet port of the inlet pipe for communicating the inner cavity of the can is located above the air inlet of the outlet pipe for communicating the inner cavity of the can.

Preferably, a sink is provided below the solid material outlet.

The heat absorbing tube is preferably a vertical equal diameter tube, the number of the tubes is preferably a plurality, and the outlet pipe and the inlet pipe are horizontal pipes, one of which is located above the heat absorbing pipe, and is connected The upper ends of the tubes are located below the heat absorbing tube, and the lower ends of the tubes are connected, preferably the outlet pipe is on, and the inlet pipe is below.

Preferably, the exhaust pipe passes through a side wall of the tank, and a portion thereof in the tank body may include a horizontal intake section, and a plurality of intake ports may be distributed on a pipe wall of the horizontal intake section. The exhaust pipe is provided with an exhaust section buried in the ground, and the exhaust section may be provided with a plurality of exhaust ports, and the material laid above the exhaust port is preferably a filter material, and the exhaust pipe is advanced. The opening direction of the port is preferably downward.

The number of horizontal intake segments of the exhaust pipe may be one or more, and the plurality of horizontal intake segments are preferably vertically distributed and collected in the same exhaust pipe outside the can body. Preferably, the middle portion of the can body has a cylindrical tubular body, the top portion is a head detachably mounted on the cylindrical body, and the bottom portion is an output hopper having an inverted frustum shape, the discharge hopper and the cylindrical body The connection is integrated, and the head is preferably elliptical, and the detachable mounting manner with the barrel is a clamp connection.

The water tank may be installed on the tank body, and the water spray pipe may extend from the outer surface of the tank body to the tank body, and the spray water pipe may be provided with a nozzle or a nozzle for flushing the outer wall of the heat absorption pipe. The water spray pipe may be connected to the water tank through a circulation pipe, and a water pump is arranged on the circulation pipe.

The charred steam pipe may further be provided with a tee connecting the exhaust steam discharge pipe, and the burnt steam pipe may be provided with a shut-off valve on a portion behind the tee and the exhaust steam discharge pipe, A muffler is preferably installed at the top of the exhaust steam exhaust pipe.

The invention discloses a pyrolysis steam burning and heat energy and material recovery system, which comprises a scorch steam pipe, a low temperature desalinated water pipe, a high temperature desalinated water pipe, a boiler water deaerator and a recycling device, wherein the recycling device adopts the cracking furnace The above-mentioned technical solution of the scorch steam purification and thermal energy and material recovery equipment, wherein the outer end of the inlet pipe of the recovery device is connected to the scorch steam pipe, and the outer end of the outlet pipe of the recovery device passes through The high temperature desalted water pipeline is connected to the deaerator, the outer end of the inlet pipe of the recovery device is connected to the low temperature desalted water pipe, and the inlet pipe is provided with an opening degree regulating valve, and the outlet pipe is provided with a temperature The sensor, the opening adjustment valve is electrically connected to the temperature sensor.

The invention has the beneficial effects that: by the recycling device or system of the invention, the four-phase waste (liquid phase, vapor phase, non-condensable gas and solid coke powder) discharged from the cracking furnace can be effectively separated, wherein the steam passes through the heat exchange Becomes condensed water, and the low temperature desalted water changes after heat exchange For high-temperature desalination, it is directly used in the deaerator of the thermal system, thereby increasing the inlet temperature of the deaerator, reducing the power consumption of the thermal system, and effectively recycling and recovering the heat in the char. The energy consumption of the system; the coke powder absorption condensate is easy to settle, can improve the recovery rate of coke powder, reduce the coke powder pollution in the exhaust gas, and improve the economic benefit; the coke powder settles into the material recovery bag and can be directly recovered; After being filtered through the material recovery bag, it enters the water tank, which can be used for spray cleaning of the heat absorption tube in the equipment, and can extract excess water for other reuse. After the non-condensable gas is discharged through the exhaust port of the exhaust pipe After filtering through the filter material, it can be purified to reduce emissions and reduce emissions to the environment.

Due to the use of the outlet pipe in the upper and lower inlet pipes, the flow of water in the heat absorption pipe is opposite to the direction of the four-phase waste entering the tank from the inlet port, thereby improving the efficiency of heat exchange, on the inlet pipe. The opening degree regulating valve and the temperature sensor on the outlet pipe are arranged so that the water inlet amount of the inlet pipe is strictly controlled according to the outlet water temperature in the outlet pipe to ensure a specific heat exchange effect.

Since the heat absorbing tube adopts a vertical equal-diameter tube, it is convenient to clean the material adhered to the wall of the tube during the heat exchange process, thereby avoiding the situation that the heat absorbing tube is pasted and cannot be applied.

Since the opening of the exhaust port on the exhaust pipe is downward, it is ensured that all of the gas discharged from the exhaust pipe is gas phase, effectively preventing water and dust from entering the exhaust pipe, and reducing the frequency of cleaning.

Since the exhaust pipe is provided with an exhaust section buried in the ground, and a filter material is laid above the exhaust port, the pollutants carried by the gas phase substance are effectively removed, and at the same time, the sound is silenced. Thanks to the installation of the water tank, the water resources separated from the four-phase waste can be effectively stored, and the recycled water resources can be applied to the cleaning of the tank in combination with the water pump, the circulation pipe and the nozzle or the nozzle.

Thanks to the detachable setting of the top of the tank, it is easy to check and repair.

Thanks to the three-way, exhaust steam drain and shut-off valve on the charred steam line, it is easy to switch between direct discharge and recovery.

DRAWINGS

Figure 1 is a schematic structural view of a system of the present invention;

2 is a schematic structural view of a recycling apparatus of the present invention.

detailed description

Referring to FIG. 1 and FIG. 2, the pyrolysis steam burning and heat energy and material recovery system provided by the present invention comprises a scorch steam pipe, a low temperature desalinated water pipe 2, a high temperature desalted water pipe 3, a recovery device 4, and a boiler water deoxidation. The recycling device comprises a tank body, wherein the tank body is provided with a heat absorbing tube 12 and an inlet pipe and an outlet pipe communicating with the heat absorbing pipe, and the tank body is provided with an inlet pipe 5 communicating with the inner cavity thereof And an exhaust pipe 6, the bottom end of the tank is provided with a solid-liquid material outlet 7. Preferably, an outlet port of the inlet pipe for communicating with the inner cavity of the can is located above the air inlet of the exhaust pipe for communicating with the inner cavity of the can. The outer end of the inlet pipe is connected to the scorch steam pipe, the outer end of the outlet pipe is connected to the deaerator through the high temperature desalted water pipe, and the outer end of the inlet pipe is connected to the low temperature desalted water a pipe, the inlet pipe is provided with an opening degree regulating valve 8, and the outlet pipe is provided with a temperature sensor 9, and the opening degree regulating valve is electrically connected with the temperature sensor, so that the water inlet amount of the inlet pipe is strictly in accordance with the outlet water in the outlet pipe The temperature is controlled to ensure that a specific heat transfer effect is achieved. The charred steam pipe can be connected a tee of the exhaust steam discharge pipe 17, a portion of the burnt steam pipe located behind the tee and the exhaust steam discharge pipe may be provided with a shut-off valve 10, a shut-off valve on the burnt steam pipe and The shut-off valve on the exhaust steam discharge pipe can be arranged in an open-closed switching mode, in which way, switching between direct discharge and heat energy recovery can be performed to pass the waste steam in system maintenance or other required conditions. The discharge pipe and the muffler 16 perform direct discharge of the exhaust steam.

In the prior art, the scorch steam pipe of the cracking furnace is usually connected to the scorch tank, and the improvement thereof can be carried out by using the above-mentioned three-way method to set a tee connected with the charred steam pipe on the scorch steam pipe to make the char The steam branch pipe is connected to the outer end of the inlet pipe of the recovery device, and a shut-off valve is arranged on the burnt steam pipe and the burnt steam branch pipe behind the tee.

Preferably, the solid-liquid material outlet is provided with a detachable material permeable bag 11 which is permeable to water and permeable to solid materials, and the material recovery bag can be made of various materials having corresponding characteristics to recover and settle from the tank body. The aqueous coke breeze, because the material recovery bag can be ventilated, thereby allowing a certain downward gas flow during the coke powder sedimentation process, so as to facilitate the coke powder sedimentation and avoid air flow disturbance, and at the same time, since the material recovery bag can be permeable to water, The water droplets contained in the settled water droplets or coke powder may flow out from the material recovery bag, and the coke powder is left in the bag to realize the recovery of water resources, and the material recovery bag may be provided with a corresponding connection interface. Plus hanging rag bag. Preferably, a water tank is provided below the outlet of the solid-liquid material for storing the recovered water resources.

The heat absorbing tube is preferably a vertical equal diameter tube, and the number of the tubes may be plural, preferably 30-50, to increase the heat exchange contact area, and improve heat exchange efficiency. And the inlet pipe can be a horizontal pipe, one of which is located above the heat absorbing pipe, and even Connected to the upper end of each of the tubes, and the other is located below the heat absorbing tube, connecting the lower ends of the tubes, preferably the outlet pipe is above, the inlet pipe is below, and the inside of the heat absorption tube is The flow direction of the water is opposite to the direction of the four-phase waste entering the inner cavity of the tank from the inlet port, thereby improving the efficiency of heat exchange, thereby increasing the outlet water temperature and lowering the outlet temperature.

The heat absorbing tube adopts a vertical equal diameter tube to facilitate cleaning, cleaning and maintenance of equipment in the tank body during the heat exchange process. There is no need to add other complicated cleaning equipment.

The exhaust pipe preferably passes through a side wall of the tank, and a portion thereof in the tank body may include a horizontal intake section, and the number of the horizontal intake section may be one or more, the plurality of The horizontal intake section is preferably distributed in upper and lower layers, and is collected in the same exhaust pipe outside the tank body, and a plurality of inlet ports may be distributed on the pipe wall of the horizontal intake section, and the inlet of the inlet port The direction is preferably downward, ensuring that all of the gas discharged through the exhaust pipe is gaseous, while avoiding the ingress of water and dust, effectively reducing the frequency of cleaning. The exhaust pipe is provided with an exhaust section buried in the ground, and the exhaust section may be provided with a plurality of exhaust ports, and the material laid above the exhaust port is a filter material 13 , through which the filter material can be Effectively filtering pollutants in the gas phase material discharged through the exhaust pipe, improving the cleanliness of the discharged gas phase materials, reducing pollution to the atmosphere, and simultaneously setting the exhaust section of the exhaust pipe underground, To the effect of muffling, the filter material may be a coarse canvas, the gas discharged from the exhaust pipe carries water and steam, and the coarse canvas has a better filtering effect on dust in a wet state.

Preferably, the middle portion of the can body has a cylindrical cylinder, so as to facilitate the suction inside The can body is inspected for maintenance and cleaning. The head is preferably elliptical, and a detachable connection between the cylinder and the cylinder can be performed by a clamp connection. The bottom of the can body preferably has an inverted cone. The hopper of the table shape is integrally connected with the barrel to facilitate the falling and collecting of dust and waste.

The water tank 14 may be installed on the tank body, and the water spray pipe may extend from the outside of the tank body to the tank body, and the spray water pipe may be provided with a spray head for flushing the outer wall of the heat absorption pipe or a nozzle, the water spray pipe may be connected to the water tank through a circulation pipe, and the circulation pipe may be provided with a water pump 15 , which is preferably located above the outlet of the steam inlet pipe, through the material recovery bag The filtered water falls into the water tank and is used for flushing the tank after being pressurized by the water pump, effectively realizing the reuse of water resources, and at the same time contributing to the accelerated falling of dust or coke powder, forming a better belt press bag.

Through the recycling equipment and the recovery system of the invention, the four-phase waste (liquid phase, vapor phase, non-condensable gas and solid coke powder) discharged from the cracking furnace can be effectively separated, wherein the steam becomes condensed water after the heat exchange, steam The heat in the cylinder can be recycled. The coke powder absorbs the condensed water and is easy to settle. It can improve the recovery rate of coke powder, reduce the coke powder pollution in the exhaust gas, and improve the economic benefit. After the coke powder settles, it enters the material recovery bag and can be directly recycled. The water is filtered out through the material recovery bag and then enters the water tank. It can be used for spray cleaning of the heat absorption tube in the equipment, and can also extract excess water for other reuse. After the non-condensable gas is discharged through the exhaust port of the exhaust pipe After filtering through the filter material, it can be purified to reduce emissions and reduce emissions to the environment.

Claims

Claim

1 . A pyrolysis steam burning and heat energy and material recovery device, comprising a tank body, wherein the tank body is provided with a heat absorption pipe and an inlet pipe and an outlet pipe connecting the heat absorption pipe, the tank The body is provided with an inlet pipe and an exhaust pipe connected to the inner cavity thereof, and the bottom end of the tank body is provided with a solid liquid material outlet.

2. The pyrolysis steam burning and heat energy and material recovery apparatus according to claim 1, wherein the solid liquid material outlet is provided with a detachable material recovery bag which is permeable to water and permeable to solid materials.

3. The cracking coke steam purification and thermal energy and material recovery apparatus according to claim 2, wherein an outlet port of the inlet pipe for communicating the inner cavity of the can is located on the gas outlet pipe. Above the air inlet that communicates with the inner cavity of the can.

4. The cracking coke steam purification and thermal energy and material recovery apparatus according to claim 3, wherein a water tank is disposed below the solid liquid material outlet.

5. The apparatus for scavenging steam burning and heat energy and material recovery according to claim 1, 2, 3 or 4, wherein said heat absorbing tube is a vertical equal diameter tube, said tube tube The number of the outlet pipe and the inlet pipe are both horizontal pipes, one of which is located above the heat absorbing pipe, connects the upper ends of the pipes, and the other is located below the heat absorbing pipe, the connection station The lower ends of the tubes are described.

6. The cracking coke steam purification and thermal energy and material recovery apparatus according to claim 5, wherein said exhaust pipe passes through a side wall of said can body, and a portion thereof located in said can body contains a level In the intake section, a plurality of intake ports are distributed on the pipe wall of the horizontal intake section, the exhaust pipe is provided with an exhaust section buried in the underground, and the exhaust section is provided with a plurality of exhausts The material laid above the exhaust port is a filter material.

7. The pyrolysis steam burning and heat energy and material recovery apparatus according to claim 5, wherein the opening of the air inlet of the exhaust pipe is downward.

8. The cracking coke steam purification and thermal energy and material recovery apparatus according to claim 6, wherein the number of horizontal intake segments of the exhaust pipe is one or more, and the plurality of horizontal intakes The segments are layered up and down and collected in the same exhaust pipe located outside the can.

9. The cracking coke steam purification and thermal energy and material recovery apparatus according to claim 7, wherein the tank body has a cylindrical cylinder body at the middle, and the top portion is detachably mounted on the cylinder body. The upper head is a discharge hopper in the shape of an inverted frustum, the hopper is integrally connected with the cylinder, the head is elliptical, and the detachable mounting manner between the hopper and the cylinder is Clamp connection.

10. The pyrolysis steam burning and heat energy and material recovery apparatus according to claim 8, wherein the tank body is provided with a water spray pipe, and the water spray pipe extends from the outer body of the tank to the a spray pipe in the tank body, the spray pipe is provided with a nozzle or a nozzle for flushing the outer wall of the heat absorption pipe, and the water spray pipe is connected to the water tank through a circulation pipe, and the circulation pipe is provided There is a water pump.

11. The pyrolysis steam burning and heat energy and material recovery apparatus according to claim 9, wherein the charred steam pipe is provided with a tee connecting the exhaust steam discharge pipe, and the burnt steam pipe is located at the A shut-off valve is disposed on a portion behind the tee and the exhaust steam discharge pipe, and a muffler is disposed on the top of the exhaust steam discharge pipe.

12. A pyrolysis furnace charring purification and thermal energy and material recovery system, characterized in that The utility model comprises a scorch steam pipeline, a low temperature desalted water pipeline, a high temperature desalted water pipeline, a boiler water deaerator and a recycling device, wherein the recycling device adopts the cracking furnace scorch steam purification and heat energy and material recovery equipment according to claim 1-11; The outer end of the inlet pipe of the recycling device is connected to the charred steam pipe, and the outer end of the outlet pipe of the recycling device is connected to the deaerator through the high temperature desalted water pipe, and the recycling device is The outer end of the water pipe is connected to the low temperature desalination pipe, the inlet pipe is provided with an opening degree regulating valve, and the outlet pipe is provided with a temperature sensor, and the opening degree regulating valve is electrically connected with the temperature sensor.