CN210057859U

CN210057859U - Tail gas treatment structure of Claus sulfur recovery device for coal chemical plant

Info

Publication number: CN210057859U
Application number: CN201920536867.7U
Authority: CN
Inventors: 胡云凯; 王启延; 吴德礼; 秦祖斌
Original assignee: Guizhou Chitianhua Tongzi Chemical Engineering Co Ltd
Current assignee: Guizhou Chitianhua Tongzi Chemical Engineering Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2020-02-14
Anticipated expiration: 2029-04-19

Abstract

The utility model provides a coal chemical plant is with Claus sulfur recovery unit's tail gas treatment structure, including Claus sulfur recovery unit, ammonia process desulphurization unit, boiler and chimney, tail gas behind the Claus sulfur recovery unit separation liquid sulfur passes through the tail gas pipeline and is connected with the boiler, and the flue gas pipeline and the ammonia process desulphurization unit of boiler are connected, and ammonia process desulphurization unit's blast pipe and chimney are connected. The utility model discloses can solve H2S content superscript in the current sulphur recovery unit tail gas, seriously influence ammonia process desulfurization system's steady operation, block up the problem of tail gas pipeline easily. The utility model belongs to the field of industrial tail gas treatment and sulphur recovery.

Description

Tail gas treatment structure of Claus sulfur recovery device for coal chemical plant

Technical Field

The utility model relates to a coal chemical plant is with Claus sulfur recovery unit's tail gas treatment structure belongs to the industrial tail gas processing field.

Background

In chemical production, when raw material coal is gasified under pressure, 80% of sulfur in the coal enters into crude gas, and H2S gas desorbed after low-temperature methanol washing is not recycled, so that not only is environmental pollution caused, but also sulfur resource waste is caused. The Claus sulfur recovery device is used as an important environment-friendly device in the operation of coal chemical production, and the operation quality of the Claus sulfur recovery device directly influences the environment-friendly operation of an enterprise at present with increasingly strict environment-friendly requirements. The existing sulfur recovery unit mainly consists of: acid gas partial oxidation (combustion), Claus catalysis, direct oxidation catalysis and tail gas washing. Specifically, the sulfur recovery tail gas treated by the claus sulfur recovery device is directly discharged from a boiler chimney after being sent to an ammonia desulphurization system for treatment through a DN450 white rust steel pipe (pipe insulation), but the following problems are found in the actual operation: 1. the content of the tail gas H2S exceeds a design value, the design value is less than 0.05mol%, and the actual value is about 1 mol%; 2. the separation effect of the separator cannot reach the expected effect, so that the tail gas pipeline is seriously blocked; 3. H2S in the tail gas enters the ammonia desulphurization system and then reacts with SO2 in the flue gas to produce elemental sulfur, ammonium sulfate crystal particles are seriously influenced, and the ammonium sulfate treatment system cannot discharge the materials, SO that the stable operation of the ammonia desulphurization system is influenced.

Disclosure of Invention

The utility model aims to provide a: the utility model provides a tail gas treatment structure of coal chemical plant with Claus sulfur recovery unit to H2S content is superscript in solving current sulfur recovery unit tail gas, seriously influences the steady operation of ammonia process desulfurization system, blocks up the problem of tail gas pipeline easily.

The scheme of the utility model is as follows: the utility model provides a coal chemical plant is with Claus sulfur recovery unit's tail gas treatment structure, includes Claus sulfur recovery unit, ammonia process desulphurization unit, boiler and chimney, and the tail gas behind the Claus sulfur recovery unit separation liquid sulfur passes through being connected of tail gas pipeline and boiler, and the flue gas pipeline and the ammonia process desulphurization unit of boiler are connected, and ammonia process desulphurization unit's blast pipe and chimney are connected.

The tail gas treatment structure of the Claus sulfur recovery device for the coal chemical plant is characterized in that the boiler is a 220t/h four-corner tangential pulverized coal boiler, and four corners of the four-corner tangential pulverized coal boiler are respectively provided with a burner.

According to the tail gas treatment structure of the Claus sulfur recovery device for the coal chemical plant, a valve and a shunt pipe are arranged on a tail gas pipeline of the Claus sulfur recovery device and are respectively connected with a burner on a four-corner tangential pulverized coal boiler through the shunt pipe.

The tail gas treatment structure of the Claus sulfur recovery device for the coal chemical plant is characterized in that a spray gun is connected to a secondary air nozzle on the upper layer of a burner of a pulverized coal boiler with tangential four corners, and a branch pipe is connected with the spray gun.

Compared with the prior art, the utility model discloses let in the boiler with Claus sulphur recovery unit's tail gas at first through the pipeline and burn, carry out desulfurization treatment in the tail gas rethread ammonia process desulfurization system after the abundant burning, discharge through the chimney at last, its technical transformation main advantage as follows:

1. according to the principle that H2S can be converted into SO2 under the high-temperature aerobic condition, H2S is completely converted into SO2 in the boiler, and then SO2 is removed by the ammonia desulphurization system, SO that S elements are effectively recovered while the stable operation of the ammonia desulphurization system is ensured, the environmental pollution is reduced, the waste of S resources is avoided, and the problem of pipeline blockage is solved by adopting whole-process heat tracing of a tail gas pipeline.

2. The investment is low. The utility model can realize the purification treatment of tail gas only by using the existing equipment in the workshop and adding a plurality of sections of pipelines without adding extra equipment, and has the advantage of investment compared with the traditional sulfur recovery tail gas treatment technologies such as catalytic hydrogenation reduction absorption method, incinerator and the like;

3. the operation management is simple. Compared with other sulfur recovery tail gas treatment technologies, the utility model is much simpler in process and interlocking logic. Namely, the operation and the operation management are simple;

4. the construction difficulty is small, and the period is short. The utility model discloses only utilize the boiler in original workshop and increase several sections pipelines in the construction, compare other sulphur recovery techniques and no matter the technology degree of difficulty, the construction degree of difficulty all will be much simpler, just face because of the big technique and the construction difficult problem of how mixing of tail gas and boiler flue gas temperature deviation if burn burning furnace technique. Meanwhile, compared with other sulfur recovery technologies, the construction period is short.

Drawings

Fig. 1 is a schematic diagram of the connection of the device of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below,

example 1:

in the tail gas treatment method of the claus sulfur recovery unit provided in this embodiment,

the tail gas after liquid sulfur separation of the Claus sulfur recovery device 1 is connected with a boiler 3 through a tail gas pipeline 5, the selected boiler is a nearby 220t/H four-corner tangential pulverized coal boiler, SO that the tail gas of the Claus sulfur recovery device 1 is firstly sent into the 220t/H four-corner tangential pulverized coal boiler through the tail gas pipeline 5 to be combusted, H2S in the tail gas is converted into SO2, the fully combusted tail gas is sent into an ammonia desulphurization device 2 to be desulfurized, SO2 is converted into ammonium sulfate crystal particles, the purified tail gas is finally discharged through a chimney 4, the pulverized coal boiler 2 is arranged in a workshop or nearby where the existing Claus sulfur recovery device 1 is located, and the tail gas treatment of the Claus sulfur recovery device can be realized by directly adding a plurality of sections of pipelines.

The connection arrangement of the tail gas pipeline 3 of the Claus sulfur recovery device 1 is as follows: because four burners of the coal powder boiler with tangential circles at four corners are positioned at the four corners, in order to ensure that the tail gas is uniformly mixed, the tail gas pipeline 3 is recommended to be divided and connected with each burner; the preferred upper overgrate air spout of tie point, the intercommunication department sets up the spray gun, send into the corner rounding buggy pot through the spray gun with tail gas in, the concrete mode is, at first carry out the trompil in the overgrate air spout department of the combustor of corner rounding buggy pot, then with the spray gun at trompil department installation fixed (guarantee that trompil department is sealed), after the tail gas pipeline 5 of claus sulphur recovery unit 1 got into the boiler boundary area, branch pipe connection to newly-increased spray gun department on the pipeline, respectively adopt metal collapsible tube and spray gun to be connected can. Considering that the tail gas is quickly cut off when the boiler is in fire extinguishing in an accident, the toxic tail gas is prevented from entering the boiler, and a pneumatic quick-closing valve is arranged on the tail gas pipeline 5 and enters the boiler to be interlocked. Since the Claus sulfur recovery tail gas is corrosive gas, the tail gas pipeline 5 and the valve are made of corrosion-resistant materials.

Claims

1. The utility model provides a coal chemical plant is with claus sulfur recovery unit's tail gas treatment structure, includes claus sulfur recovery unit (1), ammonia process desulphurization unit (2), boiler (3) and chimney (4), its characterized in that: the tail gas after the liquid sulfur is separated by the Claus sulfur recovery device (1) is connected with a boiler (3) through a tail gas pipeline (5), a flue gas pipeline of the boiler (3) is connected with an ammonia desulphurization device (2), and an exhaust pipe of the ammonia desulphurization device (2) is connected with a chimney (4); the boiler (3) is a 220t/h pulverized coal boiler with tangential four corners, and four burners are respectively arranged at four corners of the pulverized coal boiler with tangential four corners; a valve and a branch pipe are arranged on a tail gas pipeline (5) of the Claus sulfur recovery device (1) and are respectively connected with a burner on a pulverized coal boiler with tangential four corners through the branch pipe.

2. The tail gas treatment structure of a claus sulfur recovery unit for a coal chemical plant according to claim 1, characterized in that: the secondary air nozzle on the upper layer of the pulverized coal boiler burner with four tangential corners is connected with a spray gun, and the branch pipe is connected with the spray gun.