High-temperature tube box type spiral grooved tube chemical low-heating-value waste gas preheater
By designing a high-temperature tube box type spiral groove pipe chemical low-calorie value waste gas preheater, the problem of the failure of the waste gas in the malaria chemical factory cannot be effectively preheated, and efficient preheating of the waste gas from 90℃ to 500℃ is achieved, reducing energy waste and environmental risks.
Patent Information
- Application Number
- CN202420399217.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-03-01
AI Technical Summary
In the prior art, the low-calorie value exhaust gas generated by the malic anhydride chemical plant cannot be effectively preheated, resulting in energy waste and environmental protection problems.
Design a high-temperature tube box type spiral groove pipe chemical low-calorie value waste gas preheater, using φ38X3 seamless steel pipe to form a spiral groove pipe, combined with the design of pipe plate A and pipe plate B, and use cable-stayed round steel to strengthen the structure to ensure the waste gas Heat from 90°C to 500°C.
It effectively enhances the heat exchange efficiency of waste gas, prevents waste gas leakage, realizes efficient preheating and utilization of waste gas, and reduces energy waste and environmental protection risks.
Smart Images
Figure CN222460359U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a high-temperature tube box type spiral groove tube chemical low calorific value waste gas preheater. Background Art
[0002] The adjustment of domestic environmental protection policies has increased the popularity and market demand for biodegradable plastics. Maleic anhydride (C4H2O3) is an important organic chemical raw material, mainly used in the production of unsaturated polyester resins, coatings, inks, engineering plastics, pesticides, oil additives, paper sizing agents, textiles, etc. It is also used to produce a series of important fine chemicals such as acid anhydrides. Maleic anhydride production process produces waste gas, which is mainly composed of more than 70% nitrogen, oxygen, and a small amount of flammable CO, anhydrides, and alcohols. According to environmental protection requirements, this waste gas cannot be discharged directly, so it is necessary to reuse this low calorific value waste gas. At present, the main method in China is to directly incinerate it, which also causes a certain amount of energy waste.
[0003] Maleic anhydride chemical plant process produces waste gas, the volume share of the main components of the waste gas is mainly N2, O2, CO, CO2 and anhydrides, alcohols, etc., which are flammable gases with a temperature of about 90°C, a pressure of about 0.1MPa, and a low calorific value. Direct emission does not meet environmental protection requirements. Summary of the invention
[0004] The utility model aims to provide a high-temperature tube box type spiral groove tube chemical low calorific value waste gas preheater.
[0005] The above purpose is achieved through the following technical solutions:
[0006] A high-temperature tube box type spiral grooved tube chemical low calorific value waste gas preheater, comprising a waste gas preheater, one end of the waste gas preheater is formed into an inlet box by a bending plate, and the other end of the waste gas preheater is formed into an outlet box by a bending plate. A waste gas preheater tube bundle is installed inside the waste gas preheater, and the waste gas preheater tube bundle is composed of a group of heat absorbing tubes. The heat absorbing tube adopts a φ38X3 seamless steel tube, and the outside of the heat absorbing tube is pressed with a threaded groove to form a spiral groove tube. Tube sheets A are arranged at the inlet and outlet of the waste gas preheater tube bundle, and a group of tube sheets B are arranged in the middle of the waste gas preheater, and inclined round steel is installed between the tube sheets A and B.
[0007] The high-temperature tube-box type spiral grooved tube chemical low calorific value waste gas preheater is provided with condensate ports on the inlet box and the outlet box of the waste gas preheater to collect the liquid condensed when the waste gas hits the steel plate wall.
[0008] The high-temperature tube box type spiral grooved tube chemical low calorific value waste gas preheater is provided with suspension ear plates on the inlet box and the outlet box of the waste gas preheater, and the waste gas preheater is suspended on the front and rear steel structures through the suspension ear plates.
[0009] The high-temperature tube box type spiral groove tube chemical low calorific value waste gas preheater, the waste gas preheater inlet box and outlet box are provided with hanging plates.
[0010] Beneficial effects of the utility model:
[0011] 1. This utility model patent provides a high-temperature tube box type spiral grooved tube chemical low calorific value waste gas preheater, which preheats the low calorific value waste gas to 500℃ and then utilizes the residual heat after incineration. The waste gas is heated from 90℃ to 500℃ and then utilized for residual heat after incineration. Considering the composition and parameters of this waste gas, it is highly corrosive. Because the waste gas pressure is higher than the atmospheric pressure, it is a combustible gas that is easy to leak and dangerous, so this waste gas preheater needs special design.
[0012] 2. In order to prevent high-temperature corrosion of exhaust gas, the utility model reasonably selects materials. The exhaust gas preheater heat absorption tube adopts 15CrMOVG material when the exhaust gas temperature is below 400℃, and adopts anti-corrosion pipe material SA-213M Gr.TP304 when the exhaust gas temperature is above 400℃. In order to prevent exhaust gas leakage, the high-temperature heating surface of the heat absorption tube adopts seamless steel pipe with a specification of φ38X3. At the same time, in order to enhance heat transfer, the outer surface of the seamless pipe is pressed with a thread groove, which is a spiral groove pipe, which enhances heat exchange and can improve the heat exchange efficiency by about 1.2 times.
[0013] 3. The utility model can effectively enhance heat exchange and prevent waste gas leakage by adopting the waste gas preheater of the present invention, thus providing a guarantee for efficient preheating and utilization of waste gas in maleic anhydride chemical plants. It can be promoted and applied. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Attached Figure 1 It is a structural schematic diagram of the utility model.
[0015] Attached Figure 2 It is a schematic diagram of the structure of a spiral grooved tube.
[0016] Attached Figure 3 It is a structural diagram of the suspended ear plate.
[0017] In the figure: 1. Maleic anhydride process, 2. Inlet box, 3. Waste gas preheater tube bundle, 4. Outlet box, 5. Incinerator, 6. Tube sheet A, 7. Tube sheet B, 8. Inclined round steel, 9. Condensate outlet, 10. Suspension ear plate, 11. Hanging plate, 12. Steel structure. DETAILED DESCRIPTION Example
[0018] A high-temperature tube box type spiral grooved tube chemical low calorific value waste gas preheater, comprising a waste gas preheater, one end of the waste gas preheater is formed into an inlet box by a bending plate, and the other end of the waste gas preheater is formed into an outlet box by a bending plate. A waste gas preheater tube bundle is installed inside the waste gas preheater, and the waste gas preheater tube bundle is composed of a group of heat absorbing tubes. The heat absorbing tube adopts a φ38X3 seamless steel tube, and the outside of the heat absorbing tube is pressed with a threaded groove to form a spiral groove tube. Tube sheets A are arranged at the inlet and outlet of the waste gas preheater tube bundle, and a group of tube sheets B are arranged in the middle of the waste gas preheater, and inclined round steel is installed between the tube sheets A and B.
[0019] The exhaust gas preheater inlet box and outlet box are provided with condensate ports to collect the liquid condensed by the exhaust gas hitting the steel plate wall. The exhaust gas preheater inlet box and outlet box are provided with hanging lugs, through which the exhaust gas preheater is suspended on the front and rear steel structures. Example
[0020] A high temperature tube box type spiral grooved tube chemical low calorific value waste gas preheater. The low temperature (about 90°C) waste gas from the maleic anhydride process 1 enters the waste gas preheater, first passes through the inlet box 2 composed of the waste gas preheater inlet bending plate, and then enters the waste gas preheater tube bundle 3. The spiral grooved tube seamless steel pipe is detailed in the attached Figure 2 The spiral grooved tube is a tube with spiral grooves pressed out of the outside, which can enhance heat exchange. After heat exchange with high-temperature flue gas in the exhaust gas preheater, it is heated to about 500°C, and the outlet box 4 is formed by bending the plate and passed into the incinerator 5 through the flue for combustion. In order to improve the overall rigidity of the exhaust gas preheater, a 10mm thick tube sheet B6 is set at the inlet and outlet of the exhaust gas tube bundle. At the same time, 4 10mm thick tube sheets B7 are set in the middle of the exhaust gas preheater. At the same time, in order to fix the arrangement of the exhaust gas preheater heat absorption tubes, some inclined round steels 8 are set. Condensate ports 9 are set at the inlet and outlet of the exhaust gas preheater to collect the liquid condensed when the exhaust gas hits the steel plate wall. Suspension ear plates are set at the inlet and outlet of the exhaust gas preheater (see the detailed drawing of the suspension ear plate). Figure 3 ) 10 to suspend the exhaust gas preheater on the front and rear steel structures 12 to achieve a fixed effect. At the same time, hanging plates 11 are set at the inlet and outlet of the exhaust gas preheater to facilitate installation and lifting.
Claims
1. A high-temperature tube box type spiral grooved tube chemical low calorific value waste gas preheater, characterized in that: It includes a waste gas preheater, one end of the waste gas preheater is formed into an inlet box by a bending plate, and the other end of the waste gas preheater is formed into an outlet box by a bending plate. The waste gas preheater is installed with a waste gas preheater tube bundle inside, and the waste gas preheater tube bundle is composed of a group of heat absorbing tubes. The heat absorbing tube adopts a φ38X3 seamless steel tube, and the outside of the heat absorbing tube is pressed with a thread groove to form a spiral groove tube. Tube sheets A are arranged at the inlet and outlet of the waste gas preheater tube bundle, and a group of tube sheets B are arranged in the middle of the waste gas preheater, and inclined round steel is installed between the tube sheets A and B.
2. The high-temperature tube box type spiral groove tube chemical low calorific value waste gas preheater according to claim 1 is characterized by: The exhaust gas preheater inlet box and outlet box are provided with condensate ports to collect the liquid condensed when the exhaust gas hits the steel plate wall.
3. The high-temperature tube box type spiral groove tube chemical low calorific value waste gas preheater according to claim 2 is characterized by: The inlet box and the outlet box of the exhaust gas preheater are provided with suspension lugs, and the exhaust gas preheater is suspended on the front and rear steel structures through the suspension lugs.
4. The high-temperature tube box type spiral groove tube chemical low calorific value waste gas preheater according to claim 3 is characterized by: The inlet box and the outlet box of the exhaust gas preheater are provided with hanging plates.