CN221753630U - Tar collection device in tail gas of carbide firing - Google Patents

Abstract

The utility model discloses a tar collection device in tail gas of calcium carbide burning, comprising a calcium carbide furnace and a spray tower, the tail gas discharged from the calcium carbide furnace is sent to the spray tower for cooling, the calcium carbide furnace is provided with an air intake pipeline and an tail gas pipeline, and is characterized in that the spray tower is connected to an electric tar collector through the tail gas pipeline, the electric tar collector is provided with a tar pipeline and a tail gas circulation pipeline, wherein the tail gas circulation pipeline is connected to the tail gas combustion pipeline through a three-way valve, and the other end of the tail gas combustion pipeline is connected to the air intake pipeline. The tar collection device in tail gas of calcium carbide burning reduces the tail gas temperature to the operating temperature requirement of the electric tar collector through the spray tower, separates tar and other impurities through the electric tar collector, and achieves the purpose of tail gas purification.

Description

A tar collection device in tail gas from calcium carbide burning

Technical Field

The utility model relates to the technical field of calcium carbide burning tail gas treatment, in particular to a tar collection device in calcium carbide burning tail gas.

Background Art

The tail gas of the calcium carbide furnace contains a large amount of CO, which is also a usable energy medium. However, according to the characteristics of the tail gas of the calcium carbide furnace, the tail gas of the calcium carbide furnace can be collected and purified to make it meet the requirements of clean energy. This not only improves the operating environment of the calcium carbide furnace, but also turns waste into treasure, saves energy, and improves the economic benefits of the enterprise.

The exhaust gas from a closed calcium carbide furnace has high temperature, complex composition, and strong viscosity. Therefore, its exhaust gas is flammable, explosive, and not easily soluble in water. It is difficult to clean at low temperatures and is difficult to treat. At present, the existing closed calcium carbide furnace exhaust gas mainly adopts three methods: wet purification and recycling, direct post-dust removal, and dry powder dust removal. The investment cost of wet purification is large and the maintenance cost is high. Direct post-dust removal will result in tar and dust nodules coagulation, which require regular cleaning. The dust removal effect after dry powder dust removal is limited. Each has its own advantages and disadvantages. Therefore, it is necessary to improve and optimize the existing calcium carbide furnace exhaust gas treatment and tar treatment.

Utility Model Content

The purpose of the utility model is to provide a tar collection device in tail gas of calcium carbide burning to solve the problems raised in the above-mentioned background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions:

A device for collecting tar in tail gas from calcium carbide burning comprises a calcium carbide furnace and a spray tower. The tail gas discharged from the calcium carbide furnace is sent to the spray tower for cooling. The calcium carbide furnace is provided with an air intake pipeline and an tail gas pipeline. The device is characterized in that the spray tower is connected to an electric tar collector through the tail gas pipeline, and the electric tar collector is provided with a tar pipeline and a tail gas circulation pipeline, wherein the tail gas circulation pipeline is connected to the tail gas combustion pipeline through a three-way valve, and the other end of the tail gas combustion pipeline is connected to the air intake pipeline.

As a further solution of the utility model: the three-way valve is also connected to the heat exchanger, so that part of the exhaust gas enters the heat exchanger. The heat exchanger is provided with a heat exchange pipeline. The output end of the heat exchanger is connected to the exhaust pipeline and the temperature control pipeline through the three-way valve. The other end of the temperature control pipeline is connected to the exhaust pipeline.

As a further solution of the utility model: a one-way air valve is arranged at the connection point between the temperature regulating pipeline and the tail gas pipeline, and the one-way air valve is arranged at a downward inclined angle to the air inlet end of the electric tar precipitator.

As a further solution of the utility model: a fan is arranged on the exhaust gas circulation pipeline to promote the exhaust gas circulation.

As a further solution of the utility model: a corona electrode assembly and a dust collecting bin are arranged inside the electric tar precipitator, the dust collecting bin is installed inside the electric tar precipitator through a spring, and a vibration motor is fixed outside the dust collecting bin.

Compared with the prior art, the beneficial effects of the utility model are:

1. The tar collection device in the tail gas of calcium carbide burning reduces the tail gas temperature to the operating temperature requirement of the electric tar collector through the spray tower, and separates the tar and other impurities through the electric tar collector to achieve the purpose of tail gas purification.

2. The tar collection device in the tail gas of calcium carbide burning, the electric tar collector has certain requirements on the temperature and impurity content of the tail gas. Therefore, part of the purified tail gas is used for temperature control and impurity content adjustment through the temperature regulating pipeline, so that the electric tar collector can treat the tail gas efficiently and stably.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a device for collecting tar in tail gas from calcium carbide burning.

In the figure: 1. Calcium carbide furnace; 2. Electric tar collector; 3. Corona electrode assembly; 4. Spring; 5. Dust collecting bin; 6. Vibration motor; 7. Tar pipeline; 8. Exhaust gas circulation pipeline; 9. Three-way valve; 10. Heat exchanger; 11. Temperature control pipeline; 12. Exhaust pipeline; 13. Heat exchange pipeline; 14. Exhaust gas combustion pipeline; 15. Air intake pipeline; 16. Exhaust pipeline; 17. Fan; 18. Spray tower.

DETAILED DESCRIPTION

Please refer to Figure 1. In the embodiment of the utility model, a tar collection device in the tail gas of calcium carbide burning includes a calcium carbide furnace 1 and a spray tower 18. The tail gas discharged from the calcium carbide furnace 1 is sent to the spray tower 18 for cooling. The calcium carbide furnace 1 is provided with an air intake pipeline 15 and an tail gas pipeline 16. It is characterized in that the spray tower 18 is connected to the electric tar collector 2 through the tail gas pipeline 16. The electric tar collector 2 is provided with a tar pipeline 7 and a tail gas circulation pipeline 8, wherein the tail gas circulation pipeline 8 is connected to the tail gas combustion pipeline 14 through a three-way valve 9, and the other end of the tail gas combustion pipeline 14 is connected to the air intake pipeline 15. The tar collector 2 is a prior art, which refers to a coke oven gas primary cooling device that uses the action of a high-voltage direct current electric field to separate tar droplets and coal gas. The purification efficiency of the electric tar collector 2 for tar flue gas can reach 99%. The temperature of the purified exhaust gas treated by the electric tar collector 2 is 60 degrees Celsius, and the heat loss is small. The exhaust gas purified by the electric tar collector 2 has the advantage of high temperature and can be used for the intake of the calcium carbide furnace 1 to assist combustion, increase the intake temperature, and make the combustion more complete. Compared with the prior art, the exhaust gas treatment is more efficient, and it can be preheated for heat utilization to improve the combustion quality.

In a preferred embodiment, the three-way valve 9 is also connected to the heat exchanger 10, so that part of the exhaust gas enters the heat exchanger 10. The heat exchanger 10 is provided with a heat exchange pipeline 13. The output end of the heat exchanger 10 is connected to the exhaust pipeline 12 and the temperature regulating pipeline 11 through the three-way valve 9. The other end of the temperature regulating pipeline 11 is connected to the exhaust pipeline 16. The heat carried by the excess exhaust gas can be recovered through the heat exchanger 10 to reduce the exhaust temperature, and the recovered heat can be used for preheating or heating other equipment. The temperature of the exhaust gas cooled by heat exchanger 10 is 20-30 degrees Celsius. The working efficiency of the electric tar precipitator 2 is related to the temperature inside it, and the electric tar precipitator 2 is affected by the exhaust gas temperature. If the temperature is too high, a large amount of tar is likely to accumulate on the electrode surface. , which affects the dust removal effect of the equipment and increases the cleaning cost. Therefore, it is necessary to retain the exhaust gas cooling step of the original spray tower 18. The spray tower 18 will significantly cool the exhaust gas. The most efficient temperature for the electric tar collector 2 to treat and purify the exhaust gas is about 60 degrees Celsius. The exhaust gas discharged from the spray tower 18 has a large temperature difference, which will affect the treatment efficiency of the electric tar collector 2. For this reason, the temperature regulating pipeline 11 is connected to the exhaust pipeline 16, and the temperature entering the electric tar collector 2 is further controlled. The intake temperature of the electric tar collector 2 is adjusted, the temperature monitoring and the air mixing ratio can be monitored by the temperature sensor The temperature in the temperature regulating pipeline 11 and the exhaust pipeline 16 is realized in cooperation with the terminal control of the exhaust gas treatment system to ensure the intake temperature of the electric tar collector 2.

In a preferred embodiment, a one-way air valve is provided at the connection point between the temperature regulating pipeline 11 and the tail gas pipeline 16, and the one-way air valve is arranged at a downward tilt angle to the air inlet end of the electric tar precipitator 2. As the tail gas temperature decreases, the tar will begin to condense and precipitate due to the decrease in temperature. The pipeline portion where the tail gas temperature is reduced is set to a downward tilt angle, which is conducive to the condensation and precipitation of tar and the extraction of tar into the electric tar precipitator 2 for treatment and unified collection. The temperature regulating pipeline 11 draws air into the interior through the outside, and replenishes the air when the temperature regulating pipeline 11 is insufficient.

In a preferred embodiment, a fan 17 is provided on the exhaust gas circulation pipeline 8 to promote exhaust gas circulation.

In a preferred embodiment, the interior of the electric tar collector 2 is provided with a corona electrode assembly 3 and a dust collecting bin 5, the dust collecting bin 5 is installed in the electric tar collector 2 by a spring 4, a vibration motor 6 is fixed outside the dust collecting bin 5, the corona electrode assembly 3 includes a precipitation electrode, a corona electrode, an upper and lower hanger, a gas redistribution plate, a steam purge pipe, an insulation box and a feeder box, etc., which are prior art and are not repeated here. The impurities collected by the corona electrode assembly 3 are finally concentrated in the dust collecting bin 5. Due to the presence of impurities such as tar, the sewage discharge efficiency is low. By exciting the dust collecting bin 5 by the vibration motor 6, the sewage discharge efficiency can be effectively improved.

It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own emphasis. For matters that are not described in detail in some embodiments, reference can be made to the description in other embodiments.

The above-mentioned embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims (5)

1. A device for collecting tar in tail gas from calcium carbide sintering, comprising a calcium carbide furnace (1) and a spray tower (18), wherein tail gas discharged from the calcium carbide furnace (1) is sent to the spray tower (18) for cooling, and the calcium carbide furnace (1) is provided with an air intake pipeline (15) and an tail gas pipeline (16), characterized in that the spray tower (18) is connected to an electric tar collector (2) through the tail gas pipeline (16), and the electric tar collector (2) is provided with a tar pipeline (7) and a tail gas circulation pipeline (8), wherein the tail gas circulation pipeline (8) is connected to a tail gas combustion pipeline (14) through a three-way valve (9), and the other end of the tail gas combustion pipeline (14) is connected to the air intake pipeline (15). 2. A tar collection device in calcium carbide burning tail gas according to claim 1, characterized in that the three-way valve (9) is also connected to the heat exchanger (10), allowing part of the tail gas to enter the heat exchanger (10), the heat exchanger (10) is provided with a heat exchange pipeline (13), the output end of the heat exchanger (10) is connected to the exhaust pipeline (12) and the temperature regulating pipeline (11) through the three-way valve (9), and the other end of the temperature regulating pipeline (11) is connected to the tail gas pipeline (16). 3. A tar collection device in the tail gas of calcium carbide burning according to claim 2, characterized in that a one-way air valve is provided at the connection point between the temperature regulating pipeline (11) and the tail gas pipeline (16), and the one-way air valve is arranged at a downward inclined angle to the air inlet end of the electric tar collector (2). 4. A tar collection device in calcium carbide burning tail gas according to claim 1, characterized in that a fan (17) is provided on the tail gas circulation pipeline (8) to promote tail gas circulation. 5. A tar collection device in calcium carbide burning tail gas according to claim 1, characterized in that a corona electrode assembly (3) and a dust collecting bin (5) are arranged inside the electric tar collector (2), the dust collecting bin (5) is installed inside the electric tar collector (2) through a spring (4), and a vibration motor (6) is fixed outside the dust collecting bin (5).