JPS5936196B2 - Heat exchange/catalytic reaction equipment - Google Patents

Description

Detailed Description of the Invention The present invention provides a heat exchange system that functions as both a heat exchanger and a contact reactor.
This invention relates to a catalytic reaction device.

In recent years, in view of the need for energy conservation, plans are being advanced for the heat utilization of high-temperature waste gas in the steel industry, process industry, etc., but these waste gases often contain large amounts of various impurities. As a result, dust and scale adhered to the heat transfer surface of the heat exchanger, resulting in a decline in heat transfer performance due to dirt.

Furthermore, in the past, when waste gas treatment equipment was installed separately from the heat exchanger, dust and scale from the waste gas would adhere to the treatment equipment, such as the dry ammonia catalytic reduction method.
-1 SO3 contained in the combustion waste gas reacts with unreacted ammonia after passing through the catalyst section, producing ammonium sulfate or acidic ammonium sulfate, which adheres to the heat transfer surface of the heat exchanger and the catalyst section, improving heat transfer performance. However, there were drawbacks such as a decrease in catalyst performance and an increase in pressure loss, resulting in many negative effects.

The present invention forms a catalytic reaction catalyst such as a denitrification catalyst on at least a part of the inner surface of the primary fluid flow path such as heat transfer tubes, side plates, and baffle plates in the most commonly used multitubular heat exchanger. At the same time as heat exchange, denitrification and other processes are carried out in the same equipment, and a certain amount of solid particles are filled and held in the jacket of the shell-and-tube heat exchanger, and the jacket is rotated horizontally to create a tampling effect on the solid particles. The cleaning effect based on this technology completely removes dirt adhering to the catalyst parts such as the outside of the heat transfer tubes, side plates, and baffle plates, preventing the catalyst function and heat transfer efficiency from being damaged. The object of the present invention is to provide a heat exchange/catalytic reaction device that can significantly reduce the

The present invention includes a large number of heat exchanger tubes arranged between two side plates,
It consists of an end chamber provided on the outside of the side plate and a jacket surrounding the heat exchanger tube group, with the inside of the heat exchanger tube serving as a secondary fluid flow path, and the inside of the jacket outside the heat exchanger tube serving as a primary fluid flow. A catalytic reaction catalyst is provided in which a heat exchanger formed as a passage is rotatably supported with the central axis of the mantle being a substantially horizontal rotation axis, and a catalytic reaction catalyst is provided on at least a part of the inner surface of the secondary fluid passage. and a predetermined amount of solid particles are accommodated in the secondary fluid flow path.

To explain the present invention with reference to the drawings, 1 is a hollow shaft, rotatably supported by bearings 2 and 3, and driven by a sprocket wheel 4 for one rotation.

Five and six annular ice chambers are provided as end chambers, and communicate with the inside of the hollow shaft 1 through a plurality of communication passages 7 and 8 provided radially.

The communication passages 7 and 8 also serve as supports supporting the water chamber 5°6 around the hollow shaft 1 at a distance.

A large number of water tubes 9 are arranged between the water chambers 5 and 6 in parallel to the axis as heat transfer tubes.

The outside of the water pipe 9 and the outside of the water chambers 5 and 6 are surrounded by a heat insulating layer 10 made of glass wool as a jacket, and the outside is covered with a steel plate to form a shell.

One end of the hollow shaft 1 is provided with a secondary fluid outlet 11, and the other end is provided with a secondary fluid outlet 12. A partition plate 14 is provided in the hollow shaft 1, and a partition plate 14 is provided in the hollow shaft 1 to separate the hollow shaft 15 on the artificial side and the hollow shaft 17 on the outlet side. It is divided.

An inlet casing 19 having a primary fluid inlet 18 is provided on the outside of the outlet hollow shaft 17, and an outlet casing 21 having a primary fluid outlet 20 is provided outside the inlet hollow shaft 15.
is provided.

Since the secondary fluid outlet 12, the inlet casing 19 and the outlet casing 21 are fixed to the ground, seals 22, 23, 24, 25° 26 are provided between them and rotating parts.

The secondary fluid population 11 is a rotating joint.

27 is a baffle plate.

29 is a side plate, and 30 is an ammonia supply pipe.

Further, on the inner surface of the primary fluid flow path outside the water pipe 9, a catalyst section is provided, for example, for denitration, in which a catalyst such as vanadium, molybdenum, or tungsten supported on alumina TiO7 is integrally formed.

The catalyst portion is provided on the surface of the baffle plate 27, the inner surface of the side plate 29, the surface of the hollow shaft 1, the surface of the water pipe 9, or a combination thereof.

Further, a predetermined amount of solid particles such as sand is loaded into this primary fluid flow path.

During operation, if a primary fluid such as high-temperature exhaust gas is introduced into the primary fluid inlet 18 and a relatively low-temperature secondary fluid such as water or steam is introduced into the secondary fluid inlet 11, the secondary fluid will be the person L. It passes through the narrow empty shaft 15, the communication path 7, the water chamber 5, the water pipe 9, the water chamber 6, the communication path 8, and the empty narrow shaft 17, and then reaches the secondary fluid outlet.

The primary fluid enters the shell through the primary fluid inlet 18 and the inlet casing 19, detours through the baffle plate 27, contacts the outer surface of the water tube 9, heats the secondary fluid inside the water tube 9, and then enters the outlet casing 21. The primary fluid is led to the next process through the outlet.

In addition, at the same time as the waste heat recovery effect due to the heat transfer described above, NOx in the waste gas is removed from the N
The reaction is promoted by the catalyst together with H3, and denitrification is performed.

As these actions take place, products of dust, scale, and unreacted ammonia in the combustion waste gas adhere to the surfaces of the water pipe 9, side plate 29, baffle plate 27, etc. It causes a decrease in heat transfer efficiency, and if it adheres to the catalyst, it impairs the catalytic function and inhibits catalytic reactions such as denitrification.

Therefore, when such deposits have adhered to a certain extent, by applying rotational force to the sprocket wheel 4 to rotate the entire heat exchanger, the deposits can be removed by the tampling action of solid particles such as sand contained inside. The heat transfer surface and the catalyst surface are cleaned again, and heat transfer and catalytic reaction can be carried out with high efficiency.

This cleaning work can be carried out while the machine is running or stopped.

The above example shows the case of denitrification, but it can also be widely applied to cases where waste heat is recovered from a so-called dirty gas and treated by a catalytic reaction at the same time, such as when producing 803 from SO2.

The present invention includes a large number of heat exchanger tubes arranged between two side plates,
It consists of an end chamber provided on the outside of the side plate and a jacket surrounding the heat exchanger tube group, with the inside of the heat exchanger tube serving as a secondary fluid flow path, and the inside of the jacket outside the heat exchanger tube serving as a primary fluid flow. A catalytic reaction catalyst is provided in which a heat exchanger formed as a passage is rotatably supported with the central axis of the mantle being a substantially horizontal rotation axis, and a catalytic reaction catalyst is provided on at least a part of the inner surface of the secondary fluid passage. By providing a predetermined amount of solid particles in the secondary fluid flow path, the contact reactor and the heat exchanger can be integrated into one, and the structure of the equipment is extremely simple. The installation space can be small, and deposits on the heat transfer surface and catalytic active surface can be easily removed, and good heat transfer efficiency and active catalytic reactions can be maintained at all times. It is possible to provide a heat exchange/catalytic reaction device with high performance and easy maintenance, and it has extremely high efficiency in terms of practical use, energy consumption, and pollution prevention.

[Brief explanation of the drawing]

The drawings are longitudinal sectional views showing embodiments of the present invention. 1...Hollow shaft, 2...Bearing, 3...
...Bearing, 4...Sprocket wheel, 5.
...Water chamber, 6...Water chamber, 7...
Communication path, 8...Communication path, 9...Water pipe,
10... Heat insulation layer, 11... Secondary fluid inlet, 12... Secondary fluid outlet, 14...
Partition plate, 15...--Inlet side hollow shaft, 17...
・・Out [” narrow empty shaft, 18 ・・・Primary fluid inlet,
19...Artificial casing, 20...Primary fluid outlet, 21...Outlet casing, 22...
...Seal, 23...Seal, 24...
...Tool, 25...Seal, 26...
・Tool, 27...Baffle plate, 29・
...Side plate, 30...Ammonia supply pipe.

Claims (1)

[Scope of Claims] 1 Consists of a large number of heat exchanger tubes arranged between two side plates, an end chamber provided on the outside of the side plates, and a jacket surrounding the group of heat exchanger tubes, the inner part of the heat exchanger tubes being is a secondary fluid flow path, and the inside of the mantle outside the heat transfer tube is a primary fluid flow path. A heat exchanger is rotatably supported with a central axis of the mantle as a substantially horizontal rotation center axis; A catalyst section provided with a contact reaction catalyst on at least a part of the inner surface of the secondary fluid flow path,
A heat exchange/catalytic reaction apparatus characterized in that a predetermined amount of solid particles are accommodated in the secondary fluid flow path. 2. In the secondary fluid flow path, a buff /L/fre = l- is provided, which is arranged approximately at right angles to the heat transfer tube, and makes the fluid flow in a zigzag shape, and a catalyst section MjT is provided in the pan full play 1. An apparatus as set forth in claim 1. 3. The device according to claim 1 or 2, wherein the catalyst portion is provided on the inner surface of the side plate. 4. The device according to claim 1, 2, or 3, wherein the catalyst portion is provided on the outer surface of the heat transfer tube. 5. Claims 1 and 2, wherein the catalyst is at least one of vanadium, molybdenum, or tungsten supported on alumina or TlO2.
4. The device according to paragraph 3, paragraph 4.