WO2018049703A1

WO2018049703A1 - Ethanol dehydration steam heating device

Info

Publication number: WO2018049703A1
Application number: PCT/CN2016/101440
Authority: WO
Inventors: 孙明华; 王建平; 王兆民
Original assignee: 江苏金牛环保工程设备有限公司
Priority date: 2016-09-18
Filing date: 2016-10-07
Publication date: 2018-03-22
Also published as: CN106439861B; CN106439861A

Abstract

An ethanol dehydration steam heating device comprises a horizontal furnace (1), comprising, in order, a combustion chamber (1.1) at a front section, a radiant heating chamber (1.2) at a middle section, and a convection heating chamber (1.3) at a rear section. The combustion chamber (1.1) is separated from the radiant heating chamber (1.2) by a porous heat storage wall (1.4). A radiant heater (2) is disposed in the radiant heating chamber (1.2). A steam inlet (2.2.1) and a steam outlet (2.2.2) are disposed on the radiant heater (2). A vertical flue (3) is disposed at the top of the convection heating chamber (1.3). Heat exchangers (4) are disposed along the flue (3) and vertically spaced apart. The heat exchangers (4) are concatenated in order by a steam pipeline (6). The lowest heat exchanger (4) is connected to the radiant heater (2) by the steam pipeline (6). A front end of the combustion chamber (1.1) is provided with a burner inlet (1.1.2). A waste liquid gun inlet, a waste steam inlet (1.1.3), and a circulating air supplementation device (7) are disposed on a sidewall close to the front end of the combustion chamber (1.1). The circulating air supplementation device (7) comprises a hot air circulation pipeline (7.1) surrounding the sidewall of the combustion chamber (1.1) and connected thereto in a sealed manner and a hot air inlet pipe (7.2) disposed to be tangential to the hot air circulation pipeline (7.1). Air supplementation holes (7.3) surrounding the center of a circle are disposed on the sidewall of the combustion chamber (1.1) in the hot air circulation pipeline (7.1). The air supplementation holes (7.3) communicate with the combustion chamber (1.1).

Description

Alcohol dehydration steam heating device

Technical field

[0001] The present invention relates to an incineration heating furnace in an ethylene oxide plant.

Background technique

[0002] The prior art heating furnace basically adopts the structural form of a tubular heating furnace.

technical problem

[0003] The furnace has a low temperature surface of the furnace tube, the incineration of organic matter is incomplete, the convection heat exchange efficiency is low, the exhaust temperature of the heating furnace is high, and the heat efficiency is low. Problem solution

Technical solution

[0004] An alcohol dehydration steam heating device, comprising a horizontal furnace body, characterized in that the furnace body is sequentially divided into a front stage combustion chamber, a middle stage radiant heating chamber, and a rear stage convection heating chamber, and the combustion chamber and the radiant heating chamber The porous heat storage wall is separated, the radiant heating chamber is provided with a radiant heater, the radiant heater is provided with steam inlet and outlet, and the convection heating chamber is provided with a vertical upward flue at the top of the convection heating chamber, and a plurality of heat exchangers are arranged at intervals above and below the flue. a plurality of heat exchangers are sequentially connected in series by a steam pipe, and the bottom heat exchanger is connected to the radiant heater through a steam pipe, a burner inlet is arranged at the front end of the combustion chamber, and a waste liquid gun inlet is arranged at a front end of the combustion chamber side wall. The waste steam inlet and the circulating air supply device, the circulating air supply device comprises a hot air circulation pipe which is connected and connected to the side wall of the combustion chamber, and a hot air intake pipe which is arranged tangentially to the hot air circulation pipe, and is located on the combustion chamber side in the hot air circulation pipe An air hole is arranged around the center of the wall, and the air supply hole is connected to the combustion chamber.

[0005] The porous heat storage wall increases the radiant heat of the furnace to increase the temperature of the steam outlet of the radiant section, and also avoids the direct contact of the burner flame with the U-shaped tube of the radiant section, and prolongs the service life of the U-shaped tube of the radiant section. In short, energy efficient recycling of heat energy.

[0006] Preferably, the waste steam inlet is provided with a waste steam mixing distributor, and the waste steam mixing distributor comprises a vertical cylinder, a hot air inlet tangentially connected to the vertical cylinder, and waste steam disposed at the center of the vertical cylinder In the inlet pipe, the waste steam inlet pipe extends into the near bottom end of the vertical cylinder, and the waste steam inlet pipe is evenly distributed around the center of the pipe. Fan-shaped guide piece.

[0007] The improvement of the circulation air supply device can help the waste steam to be tangentially entered by the waste steam mixing distributor to produce better swirl mixing and full combustion.

[0008] Preferably, the air-filling hole is inclined, and is inclined at an angle of 15 degrees with respect to the vertical direction and rotates along the center of the combustion chamber.

62.5 degrees.

[0009] Preferably, the fan-shaped guide piece has a spread angle of 60 degrees, and each of the sector-shaped guide pieces is rotated by 26 degrees with the needle.

[0010] Preferably, the combustion chamber material is cast from an outer metal casing and an inner steel jade, and the combustion chamber is provided with at least one convex ring at a rear end thereof to form a zoom structure at the rear end of the combustion chamber.

[0011] Preferably, the radiant heater adopts a U-tube heat exchanger, and the U-tube heat exchanger comprises a U-shaped tube bundle in the radiant heating chamber and a top tube box communicating with the U-shaped tube bundle, and the steam inlet is arranged on the tube box And the steam outlet, the steam inlet is connected to the bottom heat exchanger.

[0012] Preferably, a baffle plate through which the flue gas passes between the U-shaped tube bundles is disposed below the U-shaped tube bundle.

[0013] Preferably, the bottom end of the convection heating chamber is provided with an inclined flow path baffle.

[0014] Preferably, the flue is formed by splicing several layers, and a heater is disposed on each of the flue.

[0015] Preferably, a flue connecting pipe is disposed between the upper and lower flue pipes, and the flue connecting pipe comprises a cylindrical body, preferably a cylindrical portion, an expansion joint, a lining plate on the inner side of the expansion joint, and a ceramic fiber lining.

Advantageous effects of the invention

Beneficial effect

[0016] The invention effectively utilizes thermal energy, saves natural gas and fuel, and burns fully, and achieves harmless discharge.

Brief description of the drawing

DRAWINGS

1 is a plan view of the present invention.

2 is a cross-sectional view taken along line A-A of FIG. 1.

3 is a cross-sectional view taken along line B-B of FIG. 1.

4 is a left side view of FIG. 2.

[0021] FIG. 5 is a front elevational view of the exhaust gas mixer of FIG. 2.

6 is a plan view of FIG. 5. 8 is a schematic view of the sector guide piece of FIG. 5.

9 is a partial enlarged view of FIG. 5.

[0025] FIG. 10 is a schematic view of a flue connecting pipe.

11 is a schematic view of the steam pipe of FIG. 2.

BEST MODE FOR CARRYING OUT THE INVENTION

[0027] Embodiment 1: An alcohol dehydration steam heating device, comprising a horizontal furnace body 1, the furnace body 1 is sequentially divided into a front stage combustion chamber 1.1, a middle stage radiant heating chamber 1.2, and a rear stage convection heating chamber 1.3, burning Room 1.1 is a horizontal round straight cylinder. The material of the combustion chamber 1.1 is made of metal shell of external Q235B and internal steel jade. The radiant heating chamber 1.2 and the convection heating chamber 1.3 are made of external Q235B metal shell and internal ceramic fiber cotton lump. Made. The proximal end of the combustion chamber 1.1 is provided with two convex rings 1.1.1, and the convex ring 1.1.1 is made of refractory material, so that the rear end of the combustion chamber 1.1 forms a scaled structure. The combustion chamber 1.1 and the radiant heating chamber 1.2 are separated by a ceramic porous heat storage wall 1.4, the radiant heating chamber 1.2 is provided with a radiant heater 2, the radiant heater 2 is a U-tube heat exchanger, and the U-tube heat exchanger includes radiation. a U-shaped tube bundle 2.1 in the heating chamber 1.2 and a top tube box 2.2 communicating with the U-shaped tube bundle 2.1. The upper portion of the tube box 2.2 is provided with a steam inlet 2.2.1 and a steam outlet 2.2.2, and the top of the convection heating chamber 1.3 is vertically disposed. In the upward flue 3, the flue 3 is formed by splicing eight, B, C, D, and four layers, and a heat exchanger 4 is disposed on each of the flues 3. Heat exchanger 4 material 316 on layer A flue 3, heat exchanger 4 on layer B flue 3 material 321 , heat exchanger 4 material on layer C flue 3 material 304, change on D layer flue 3 The heat exchanger 4 material 304 is provided with a flue connecting pipe 5 between the upper and lower flue pipes 3, and the flue connecting pipe 5 includes the cylindrical body 5.1, the expansion joint 5.2 on the cylindrical body 5.1, the inner liner 5.3 of the expansion joint 5.2, and the ceramic. Fiber lining 5.4. The four heat exchangers 4 are connected in series by a steam line 6, and the steam inlet 2.2.1 of the tank 2.2 is connected to the bottommost heat exchanger 4. The front end of the combustion chamber 1.1 is provided with a burner inlet 1.1.2, and the side wall of the combustion chamber 1.1 is provided with a waste liquid gun inlet, a waste steam inlet 1.1.3, a flame observation port, a meter insertion port (a temperature detection port, a negative pressure detection port). And the circulating air supply device 7, the circulating air supply device 7 is distributed at a position 1500 mm backward of the front end of the combustion chamber 1.1, and the circulating air supply device 7 includes a hot air circulation pipe 7.1 surrounding the side wall of the combustion chamber 1.1 and sealingly connected thereto, and the hot air Circulating pipe 7.1 tangentially set hot air intake pipe 7.2, located on the side wall of the combustion chamber 1.1 in the hot air circulation pipe 7.1, around the center of the circle, there is a venting hole 7.3, the venting hole 7.3 is inclined, and the inclination angle is 15 degrees from the vertical direction. And rotates 62.5 degrees along the center of the combustion chamber 1.1, and the air supply hole 7.3 communicates with the combustion chamber 1.1. Waste steam import 1.1.3 set in the circulation of wind The rear side of the device 7 is provided with a waste steam mixing distributor 8 comprising a vertical cylinder 8.1, a hot air inlet 8.2 tangentially connected to the vertical cylinder 8.1, and a center of the vertical cylinder 8.1 The waste steam inlet pipe 8.3, the waste steam inlet pipe 8.3 extends into the near bottom end of the vertical cylinder 8.1, and the waste steam inlet pipe 8.3 end is evenly distributed with eight sector-shaped guide pieces 8.4 around the center of the circle. The fan-shaped guide piece 8.4 has an angle of 60 degrees, and each of the sector-shaped guide pieces 8.1 is mounted with a 26-degree rotation of the needle. Below the U-shaped tube bundle 2.1 is provided a deflector baffle 9 for passing the flue gas from between the U-shaped tube bundles 2.1. The bottom end of the convection heating chamber 1.3 is provided with a flow path baffle 1.3.1 inclined at 35°. The steam pipe 6 is a bent pipe structure, and an expansion joint 6.1 is disposed on the pipe body.

[0028] The material of the A, B, C and D flue 3 is Q235B/ceramic fiber lump, which is made of hanging fiber cotton lump, sealed as a looper flange and gland, including each layer of flue 3 shell There is a 35° deflector 3.1 to change the direction of the flue gas, so that the heat exchanger 4 and the flue gas fully exchange heat. Process steam (pipe layer), perforated tube sheet, finned tube, head, etc., its material is selected according to the flue gas temperature in each layer of flue (A material 316, B material 321, C material 3 04, D material 304) Each layer of flue 3 has a spring bracket 3.2 outside the shell, and the spring bracket 3.2 is symmetrically arranged, which reduces the thermal deformation of the equipment and the high temperature steam pipe, greatly improves the heat transfer efficiency of the convection section, and the top of the D layer flue 3 The soft water heater is provided, and the heating structure of the pressure vessel of the soft water heater is changed to the structure of the high-pressure pipeline in the outer finned tube of the tube, which simplifies the structure and manufacturing difficulty of the soft water heater, and the above furnace body and heater The structure and combination increase the heating efficiency of the incinerator and reduce fuel consumption.

[0029] The combustion chamber in the front stage, the radiant heating chamber in the middle stage, and the convection heating chamber in the rear stage are an integral structure or a segmented splicing structure.

[0030] The entire apparatus of the present invention operates under negative pressure (-lOOpa).

Claims

Claim

[Attach 1] An alcohol dehydration steam heating device, comprising a horizontal furnace body, characterized in that the furnace body is sequentially divided into a front stage combustion chamber, a middle stage radiant heating chamber, and a rear stage convection heating chamber, a combustion chamber and radiant heating The chamber is separated by a porous heat storage wall. The radiant heating chamber is provided with a radiant heater. The radiant heater is provided with steam inlet and outlet. The top of the convection heating chamber is provided with a vertical upward flue, and the flue is arranged at intervals above and below. The heat exchanger, a plurality of heat exchangers are sequentially connected in series by a steam pipe, the bottom heat exchanger is connected to the radiant heater through a steam pipe, the burner inlet is provided at the front end of the combustion chamber, and the waste liquid gun is disposed at the front end of the combustion chamber side wall Imported, waste steam inlet and circulating air supply device, the circulating air supply device comprises a hot air circulation pipe which is connected around the side wall of the combustion chamber and is connected with the hot air circulation pipe which is tangentially arranged with the hot air circulation pipe, and is located in the hot air circulation pipe. An air supply hole is arranged around the center of the chamber on the side wall, and the air supply hole is connected to the combustion chamber.

[Claim 2] The alcohol dehydration steam heating device according to claim 1, wherein the waste steam inlet is provided with a waste steam mixing distributor, and the waste steam mixing distributor comprises a vertical cylinder and a vertical cylinder The tangentially connected hot air inlet, the waste steam inlet pipe disposed at the center of the vertical cylinder body, the waste steam inlet pipe extends into the near bottom end of the vertical cylinder body, and a plurality of fan-shaped guide pieces are evenly distributed around the center of the waste steam inlet pipe.

[Attaction 3] An alcohol dehydration steam heating apparatus according to claim 1, wherein the air supply hole is inclined and inclined at an angle of 15 degrees with respect to the vertical direction and rotated by 62.5 degrees along the center of the combustion chamber.

[Claim 4] An alcohol dehydration steam heating apparatus according to claim 2, wherein the fan-shaped guide piece has a spread angle of 60 degrees, and each of the sector-shaped guide pieces is rotated by 26 degrees with the needle.

[Claim 5] The alcohol dehydration steam heating device according to claim 1, wherein the combustion chamber material is cast from an outer metal casing and an inner steel jade, and at least one convex ring is disposed near the rear end of the combustion chamber. , to form a zoom structure at the rear end of the combustion chamber.

[Claim 6] An alcohol dehydration steam heating apparatus according to claim 1, wherein the radiant heater adopts a U-tube heat exchanger, and the U-tube heat exchanger includes a U-shaped tube bundle in the radiant heating chamber and U-shaped tube bundle connected to the top tube box, the tube box is provided with steam inlet and steam outlet The steam inlet is connected to the bottom heat exchanger.

[Claim 7] An alcohol dehydration steam heating apparatus according to claim 7, wherein a flow guide plate through which the flue gas passes between the U-shaped tube bundles is disposed under the U-shaped tube bundle.

[Claim 8] An alcohol dehydration steam heating apparatus according to claim 1, wherein an inclined flow path baffle is provided at the bottom end of the convection heating chamber.

[Claim 9] An alcohol dehydration steam heating apparatus according to claim 1, wherein the flue is formed by splicing a plurality of layers, and a heater is disposed on each of the flue.

[Claim 10] The alcohol dehydration steam heating device according to claim 1, wherein a flue connecting pipe is disposed between the upper and lower flue pipes, and the flue connecting pipe includes a cylinder body and an expansion joint on the cylinder body. , the inner liner of the expansion joint and the ceramic fiber lining.