Product Description:

The exhaust temperature of many power plant boilers in our country is higher than the design value, about 20-30 ℃ higher than the design value. Therefore, installing low-temperature economizers after power plant boilers to reduce exhaust gas temperature has important practical significance for saving fuel and reducing pollution.

At present, the exhaust temperature of domestic power plant boilers is mostly between 120 ℃ and 140 ℃, and some even reach over 160 ℃. Therefore, the decrease in exhaust gas temperature of boilers in China is significant, and the corresponding amount of standard coal consumption that can be reduced is also considerable. At normal boiler exhaust temperatures, boiler exhaust is also a potential source of heat, and many new technologies and equipment can be used to reduce the exhaust temperature of the boiler. Smoke exhaust loss is an important heat loss in boiler operation, generally about 5% to 12%, accounting for 60% to 70% of the boiler's heat loss. The main factor affecting exhaust heat loss is exhaust temperature. Generally, for every 10 ℃ increase in exhaust temperature, exhaust heat loss increases by 0.6% to 1.0%, resulting in an additional coal consumption of 1.2 to 2.4 g/kWh.

Reducing the exhaust temperature has important practical significance for energy conservation and emission reduction,Installing a low-temperature economizer in the tail flue of the boiler can achieve deep recovery of flue gas waste heat, increase power generation, reduce coal consumption, save desulfurization water consumption, and protect the chimney.

Product features:

1. The use of H-shaped finned tubes as heat exchange elements has the characteristics of high heat transfer efficiency, compact structure, less dust accumulation, good wear resistance, and strong overall rigidity, which effectively eliminates waste heat recovery.

2. The smoke inlet adopts the patented design and manufacturing of Xi'an Jiaotong University, which ensures uniform smoke intake and effectively reduces wear and tear.

3. The low-temperature section of the components in contact with the smoke is made of sulfuric acid resistant steel, which ensures uniform smoke intake and effectively reduces wear and tear

4. There is a maintenance gap (usually 800-900mm) between the high temperature section and the low temperature section to facilitate maintenance;

5. Modular design method, easy and reliable installation, simple operation, and high efficiency;

Product advantages:

(1) Reliability. The selection of all design parameters first considers the reliable operation of the unit.

(2) Economic viability. On the premise of reliable operation, try to increase the heat exchange temperature difference as much as possible, reduce the volume and weight of the heat exchange surface, and minimize equipment investment. On the basis of technical and economic comparison, the reasonable design of the reduction value of smoke temperature should not be less than 20 ℃. If the flue gas temperature is excessively reduced, in addition to the limitation of the fan pressure head margin, the energy saving per unit of flue gas temperature drop will rapidly decrease, and the investment payback period will also be greatly extended.

(3) Reasonable optimization. Strive for a high energy level for heat recovery. By coupling the boiler system and steam turbine system reasonably, the position of the water intake and return points of the low-temperature economizer can be optimized reasonably.

(4) Safe. Reasonably control the metal wall temperature of the heating surface and avoid the dew point of the flue gas. This is a prerequisite for ensuring that the heating surface does not leak, and all schemes must first meet this condition.

Using H-type as the heat exchange element, it has the characteristics of high heat transfer efficiency, compact structure, less ash accumulation, good anti-wear performance, and strong overall rigidity, and has good smoke exhaust waste heat recovery effect. There is a maintenance gap (usually 500-600mm) between the high temperature section and the low temperature section to facilitate maintenance. The low-temperature section of the components in contact with the flue gas is made of sulfuric acid resistant steel, ensuring a service life of at least 10 years for the entire machine. The smoke inlet adopts a guide plate and wear-resistant pipe structure, which ensures uniform smoke intake and effectively reduces wear.

Product Design Proposal:

(1)Option 1: Install the low-temperature economizer after the dust collector

(2)Option 2: Install the low-temperature economizer before the dust collector

(3)Plan 3: Low temperature economizer is arranged separately before and after the dust collector

In short, the placement of low-temperature economizers needs to be determined based on the main contradiction that users need to solve, and users can make different choices according to whether the on-site space allows it.

Overall product image:

technological process:

1. Used for heating condensate solution

The low-temperature economizer is connected in parallel or series with a certain stage low-pressure heater to heat the condensed water, thereby reducing the amount of air extracted from the turbine, increasing the power output of the turbine, and improving the overall efficiency of the unit.

2. Used for hot water heater solutions

The flue gas heat recovered by the "low-temperature economizer" is heated by a hot water heater to increase the temperature of the combustion air, thereby improving boiler efficiency and increasing unit output

3. Joint scheme of heater and condensate preheater

The allocation of hot water flow can be optimized according to seasons, unit output, etc., so that the thermal energy absorbed by the "low-temperature economizer" can be more fully utilized

4As a standalone hot water boiler for use