Unlock instant, AI-driven research and patent intelligence for your innovation.

Technique for recycling heat energy of tail gas of gas-fired boiler and purifying nitric oxide

A heat energy recovery and nitrogen oxide technology, applied in lighting and heating equipment, etc., can solve the problems of low energy saving efficiency and ineffective recovery of latent heat, and achieve the effect of reducing carbon emissions and saving fuel

Inactive Publication Date: 2014-11-19
佘洪舟 +1
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the most worthwhile recovery of a large amount of heat energy in the flue gas is the latent heat released by the water vapor during the cooling process of 90°C to 50°C. Therefore, most of the boiler energy-saving equipment currently used can only recover the sensible heat of the gas above 100°C, which is different from that of the flue gas. Compared with the larger latent heat, it cannot be effectively recovered, and the energy saving efficiency is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Technique for recycling heat energy of tail gas of gas-fired boiler and purifying nitric oxide

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0070] Adsorb NO X The preparation method of the adsorbent: its raw material quality consists of: 20-50% of natural zeolite, 10-55% of attapulgite, and 15-65% of clay; comprising the following steps:

[0071] (1) Crush the natural zeolite to 2-4mm particles, and then use HNO 3 、H 2 SO 4 or HCl treatment, HNO 3 、H 2 SO 4 or HCl, after treatment, dry below 130°C;

[0072] (2) The natural zeolite treated in step (1) is treated with NaOH solution, dried at 130°C after the treatment, and then crushed to more than 200 mesh;

[0073] (3) The attapulgite is crushed to more than 100 mesh;

[0074] (4) Natural clay using HNO 3 、H 2 SO 4 Or HCl treatment, heat and dry below 130°C after treatment;

[0075] (5) The natural clay treated in step (4) is treated with NaOH solution, baked and dried at 130°C after the treatment, and then pulverized to 100 mesh;

[0076] (6) Mix the materials prepared in step (2), step (3), and step (5), and shape them into 1-5mm particles on a moldin...

Embodiment 1

[0079] The temperature of the flue gas discharged from the boiler is 130°C, and the NOx concentration is 250mg / m 3 .

[0080] Through the first stage metal heat exchanger, the flue gas temperature drops to 100°C. The inlet water temperature of the heat exchanger is 45°C. The outlet water temperature is 75°C. It can be directly used for heating.

[0081] The flue gas enters the second-stage anti-corrosion heat exchanger, and the outlet gas temperature drops to 55°C. The inlet water temperature is 45°C, and the outlet water temperature is 50°C. This part of water is sent back to the boiler for further heating.

[0082] After passing through the third-stage anti-corrosion heat exchanger, the outlet temperature of the flue gas drops to 28°C, and then it can enter the adsorption device for NOx purification. The third-stage heat exchanger has an inlet water temperature of 12°C and an outlet water temperature of 22°C. This part of water is cooled in the heat pump source water c...

Embodiment 2

[0086] The flue gas temperature is 100°C, and the NOx concentration at the boiler outlet is 150mg / m 3 .

[0087] The flue gas enters the first-stage heat exchanger, which is directly an anti-corrosion heat exchanger, and the outlet temperature drops to 65°C. The inlet temperature of the water is 40°C and the outlet water temperature is 50°C. This boiler heating system is a direct heating system, and the heating water temperature is required to be 50°C, so the outlet water can be directly used for heating.

[0088] The flue gas enters the second-stage anti-corrosion heat exchanger, the outlet flue gas temperature is 25°C, and can enter the adsorption device for purification. The inlet water temperature is 8°C and the outlet water temperature is 19°C. This part of the water is measured at the source water of the heat pump, and the temperature is continuously lowered and circulated through the heat pump. The load side at the other end of the heat pump heats the incoming water...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a technique for recycling heat energy of tail gas of a gas-fired boiler and purifying nitric oxide and belongs to the technical field of purifying of nitric oxide and recycling of heat energy. The technique includes firstly cooling exhaust gas by multistage heat exchangers made of corrosion-resistant materials, cooling the exhaust gas to lower temperature by a heat pump technology at the last stage, and recycling heat energy during cooling; purifying the cooled gas by an adsorbing device and renewable adsorbent adsorbing NOx, desorbing and renewing the saturated adsorbent adsorbing the NOx, and absorbing the high-concentration gas NOx desorbed out by water to be nitric acid. By the technique, cooling the exhaust gas to lower temperature is a necessary condition for adsorbing purifying, while adsorbing purifying guarantees that no HNO3 and HNO2 in the low-temperature exhaust gas after efficient heat energy recycling are left to corrode metal pipelines, so that by a collaborative and complementary system of NOx adsorbing purifying and heat energy recycling, the problems about purifying of NOx gas contamination, efficient heat energy recycling and pipeline corrosion are solved.

Description

technical field [0001] The invention relates to nitrogen oxide (NOx) purification and heat energy recovery process of gas-fired boiler exhaust gas, specifically: a metal heat exchanger, a heat exchanger made of corrosion-resistant materials, a heat pump, and an adsorption device equipped with a special adsorbent for adsorbing NOx The device is a regeneration system for regenerating an adsorbent, a production system for producing nitric acid through multi-stage absorption during regeneration, and belongs to the technical field of nitrogen oxide purification and heat energy recovery. Background technique [0002] In recent years, there have been more smog in many cities in China, mainly due to industrial development and the increase in the number of cars. The NOx produced by industrial boilers (including kilns and gas boilers) and internal combustion engine combustion has increased significantly, and is discharged into the atmosphere to form aerosols with water in the air, whi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/00
Inventor 佘洪舟佘名汉赵刚
Owner 佘洪舟