Washing cooler for recovering waste heat at raw gas outlet of Lurgi furnace

Abstract

The utility model belongs to the technical field of coal gasification equipment, and particularly relates to a washing cooler for recovering waste heat at a raw gas outlet of a Lurgi gasifier, which comprises a washing cooler main body, a raw gas inlet pipe is connected to the upper end of the washing cooler main body, and a gas water inlet is arranged at the upper part of the washing cooler main body. The lower part of the washing cooler main body is provided with a raw gas outlet, the upper part of the washing cooler main body is provided with a jacket, the lower part of the jacket is provided with a boiler water inlet, and the upper part of the jacket is provided with a steam outlet. The jacket is additionally arranged outside the washing cooler to reduce the temperature of the raw gas at the outlet of the Lurgi furnace, and meanwhile, waste heat is utilized to generate steam to provide guarantee for subsequent production; according to the utility model, the washing cooler and the jacket are matched for cooling, so that the consumption of gas water for washing and chilling in the washing cooler can be reduced, the amount of wastewater generated after raw gas is cooled is reduced, and the investment for wastewater treatment is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal gasification equipment, and in particular relates to a washing cooler used for recovering waste heat from a crude coal gas outlet of a Lurgi furnace. Background Art

[0002] At present, the temperature of the crude gas at the outlet of the Lurgi furnace crushed coal pressurized gasifier is about 700℃, and it also contains tar, naphtha, naphthalene, phenol, ammonia and other components. Before the crude gas enters the next process, its temperature is required to be controlled at 200℃, and the tar, naphtha, naphthalene, phenol, ammonia and other components are controlled at a low level. The common cooling method is to use a scrubber cooler for cooling. This method has the following problems:

[0003] 1. Conventional washing coolers do not fully utilize the 500°C temperature difference, resulting in a large amount of heat loss and increased energy consumption;

[0004] 2. Conventional washing coolers will use a large amount of gas water for cooling, resulting in a large amount of wastewater containing impurities such as tar, naphtha, and ammonia in the subsequent process, which increases the investment in subsequent environmental protection facilities and increases the complexity of wastewater treatment;

[0005] 3. The conventional washing cooler is an integrated structure, and the temperature difference between the raw gas inlet and outlet is large, the equipment is easily damaged, and the maintenance time is long after the equipment is damaged. Utility Model Content

[0006] In view of the above problems, the utility model provides a washing cooler for recovering waste heat from a crude coal gas outlet of a Lurgi furnace.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A scrubbing cooler for recovering waste heat from a crude gas outlet of a Lurgi furnace comprises a scrubbing cooler body, the upper end of the scrubbing cooler body being connected to a crude gas inlet pipe, a gas water inlet being arranged at the upper portion of the scrubbing cooler body, a crude gas outlet being arranged at the lower portion of the scrubbing cooler body, a jacket being arranged at the upper portion of the scrubbing cooler body, a boiler water inlet being arranged at the lower portion of the jacket, and a steam outlet being arranged at the upper portion of the jacket.

[0009] Furthermore, the boiler water inlet and the steam outlet are distributed diagonally.

[0010] Furthermore, the washing cooler body is a vertical structure.

[0011] Furthermore, the washing cooler body is divided into an upper cooler chamber and a lower cooler chamber, the jacket is installed on the upper cooler chamber, the upper cooler chamber and the lower cooler chamber are connected by a lower flange, and the upper end of the upper cooler chamber is connected to the raw gas inlet pipe through an upper flange.

[0012] Furthermore, the gas water inlet is located at half the height of the upper chamber of the cooler.

[0013] Furthermore, the raw coal gas outlet is located at one-half of the height of the lower chamber of the cooler.

[0014] Furthermore, the bottom of the lower chamber of the cooler is an arc-shaped structure.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The utility model adds a jacket outside the washing cooler to reduce the temperature of the crude gas at the outlet of the Lurgi furnace, and uses waste heat to produce steam, providing guarantee for subsequent production;

[0017] The utility model adopts a washing cooler and a jacket to cooperate in cooling, which can reduce the amount of gas water used for washing cold shock in the washing cooler, reduce the amount of waste water generated after the raw gas is cooled, and is conducive to saving investment in waste water treatment;

[0018] The utility model connects the raw gas inlet pipe to the upper chamber of the cooler, and the upper chamber of the cooler to the lower chamber of the cooler through an upper flange and a lower flange respectively. The upper chamber of the cooler is more easily damaged than other parts, and can be replaced or repaired by disassembly, which can save repair costs.

[0019] The utility model sets the gas water inlet at one-half of the upper chamber of the cooler. If the height is too high, it is not conducive to the recovery of waste heat by boiler water. If the height is too low, it will cause the boiler water to recover too much heat, causing the raw gas temperature to reach the raw gas impurity dew point range, causing coking and blockage on the equipment surface, ensuring continuous and stable production operation.

[0020] After the raw coal gas enters the upper chamber of the cooler, it first absorbs heat through the boiler water at the upper part and then undergoes gas water cooling, which can maximize the use of the waste heat of the raw coal gas, reduce heat loss, and improve the comprehensive utilization rate of energy;

[0021] The utility model adopts vertical installation, which can save floor space and make full use of equipment space;

[0022] The bottom of the lower chamber of the cooler of the utility model adopts an arc-shaped structure, which can reduce the dead angle of the equipment and reduce the probability of coking and corrosion of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the structure of the utility model;

[0024] In the figure, there are a cooler upper chamber 1, a cooler lower chamber 2, a jacket 3, a crude gas inlet pipe 4, an upper flange 5, a lower flange 6, a crude gas outlet 7, a gas water inlet 8, a boiler water inlet 9, a steam outlet 10, and a washing cooler body 11. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0026] like Figure 1 As shown, a washing cooler for recovering waste heat from a crude gas outlet of a Lurgi furnace comprises a washing cooler body 11, the washing cooler body 11 is a vertical structure, the washing cooler body 11 is divided into a cooler upper chamber 1 and a cooler lower chamber 2, the bottom of the cooler lower chamber 2 is an arc-shaped structure, the cooler upper chamber 1 and the cooler lower chamber 2 are connected by a lower flange 6, the upper end of the cooler upper chamber 1 is connected to a crude gas inlet pipe 4 by an upper flange 5, a gas water inlet 8 is provided on the cooler upper chamber 1, the gas water inlet 8 is located at half the height of the cooler upper chamber 1, a crude gas outlet 7 is provided on the cooler lower chamber 2, the crude gas outlet 7 is located at half the height of the cooler lower chamber 2, a jacket 3 is provided on the cooler upper chamber 1, a boiler water inlet 9 is provided at the lower part of the jacket 3, a steam outlet 10 is provided at the upper part of the jacket 3, and the boiler water inlet 9 and the steam outlet 10 are distributed diagonally.

[0027] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace, characterized in that: The invention comprises a washing and cooling device body (11), the upper end of which is connected to a raw gas inlet pipe (4), a gas water inlet (8) is arranged at the upper part of the washing and cooling device body (11), a raw gas outlet (7) is arranged at the lower part of the washing and cooling device body (11), a jacket (3) is arranged at the upper part of the washing and cooling device body (11), a boiler water inlet (9) is arranged at the lower part of the jacket (3), and a steam outlet (10) is arranged at the upper part of the jacket (3).

2. A scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace according to claim 1, characterized in that: The boiler water inlet (9) and the steam outlet (10) are distributed diagonally.

3. The scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace according to claim 1, characterized in that: The washing cooler body (11) is a vertical structure.

4. A scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace according to claim 3, characterized in that: The washing cooler body (11) is divided into an upper cooler chamber (1) and a lower cooler chamber (2). The jacket (3) is installed on the upper cooler chamber (1). The upper cooler chamber (1) and the lower cooler chamber (2) are connected via a lower flange (6). The upper end of the upper cooler chamber (1) is connected to a raw coal gas inlet pipe (4) via an upper flange (5).

5. A scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace according to claim 4, characterized in that: The gas and water inlet (8) is located at half the height of the upper chamber (1) of the cooler.

6. A scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace according to claim 4, characterized in that: The crude coal gas outlet (7) is located at half the height of the cooler lower chamber (2).

7. A scrubbing cooler for waste heat recovery at the outlet of crude gas from a Lurgi furnace according to claim 6, characterized in that: The bottom of the cooler lower chamber (2) is an arc-shaped structure.

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