Four Claw Grate 112-175mm High-Efficiency Energy-Saving Combustion Coal Biomass Pellet Boiler, High-Temperature Resistant Cast Iron/Steel Boiler Fitting

Product Introduction
                    Chain grate is a mechanized combustion equipment used in coal-fired boilers for transporting and burning solid fuels such as coal and biomass. Its stable operation directly affects combustion efficiency and boiler life.

Product parameters

Company Profile
             Shandong Jiaguang International is a high-tech enterprise focusing on the research and development, production, sales and service of boiler parts. The company has 30 years of manufacturing experience, as well as modern production base and senior technical team, to ensure to meet the needs of friends from all walks of life for products, and through the ISO9001 international quality system certification, CE certification, SGS origin certification.
The company's main products cover: Active grate, passive grate, grate pin, beam grate, scale grate, reciprocating grate, fixed grate, grate, chain grate, chain rod, scraper accessories, buried scraper chain, boiler hood, boiler tube, steel pipe, square tube, gear and other heat resistant, wear-resistant, corrosion resistant boiler accessories, widely used in electricity, heat, heating, paper mill, printing and dyeing factory, sugar factory, animal farming, Feed mill, chemical industry, etc. Products are exported to Vietnam, Singapore, Thailand, India, India, Pakistan, Tajikistan, Australia, New Zealand, Mexico, Russia, Malaysia, Philippines, South Africa and other more than 30 countries and regions.
It is committed to providing high-quality accessories and solutions for global industrial boilers, power station boilers, civil boilers and other fields, and has become a global benchmark enterprise in the field of boiler accessories.

Product Certification

Product packaging
1. Principles of Packaging Design
Protection Shock proof and buffering: precision accessories (such as instruments and valves) need to be filled with foam, bubble film, pearl cotton, etc. to avoid damage caused by transportation shock.
Moisture and rust prevention: Metal components (such as pipelines and flanges) need to be coated with rust prevention oil and packaged with moisture-proof film or vacuum. Desiccant should be added during sea transportation.
Anti pressure and anti drop: Heavy accessories (such as burners and drums) are reinforced with wooden boxes or steel frames, indicating the load-bearing direction and stacking layer limits.

2. Standardization and identification
Comply with international transportation standards (such as ISO, ISTA), indicate weight, size, lifting point, "fragile", "moisture-proof", "upward" and other markings.
Dangerous accessories (such as fuel injectors) must be labeled with UN certification and comply with the International Maritime Dangerous Goods Code (IMDG).

3. Container division strategy
Small items (bolts, washers) should be packaged in a uniform size box to avoid loose parts; Large items (heat exchangers) are individually customized in wooden boxes with supporting frames inside.

Product transportatio
Transportation mode selection
1. Shipping by sea
Suitable for bulk accessories such as steel plates and large pipelines, pay attention to container size (20GP/40HQ) and load balance.Sea freight requires anti salt spray treatment, with moisture-proof agents placed inside the container and sealed.

2. Land transportation
Heavy accessories (over 3 tons) require flatbed trucks or low chassis vehicles, and routes should be planned in advance to avoid height/weight restrictions.Cross border transportation inspection of various countries' requirements for wooden packaging (such as ISPM15 fumigation certificate).

3. Air freight
Urgent small items (electronic controllers) should be prioritized for air transportation, and the weight of each item should be controlled (usually<100kg) to reduce packaging weight and save costs.

FAQ:
Frequently Asked Questions and Answers (Q&A) for Boiler Four Claw Stoves

Q1: What is the reason for the breakage or deformation of the four claw grate plate? How to solve it?
A1:  reason:
1. Material not resistant to high temperatures: Ordinary cast iron (HT250) is prone to deformation under long-term high temperatures (>800 ° C).
2. Uneven combustion: Local high temperatures cause thermal stress concentration in the grate plates.
3. Mechanical damage: Large pieces of coal or coke get stuck and forcefully run, resulting in fracture.
solve:
Replace with high chromium alloy grate plates (such as Cr20Mo3, temperature resistant to 950 ° C).
Adjust the coal seam thickness (100-150mm) and the air blowing ratio to prevent coking.
Install a coal particle screening device * * to remove coal blocks larger than 50mm.

Q2: What should I do if the grate deviates or gets stuck?
A2:  reason:
1. Improper installation of sprocket: The axis deviation of the driving/driven sprocket is greater than 2mm/m.
2. Uneven chain tension: one side is too tight or too loose.
3. Track slag accumulation: The side seal sub piece is worn, and coal slag enters the track.
solve:
Adjust the parallelism of the sprocket using a laser calibrator.
Regularly check the tensioning device (such as KH-20 type snap spring).
Clean up the track debris and replace the worn side sealing gasket (such as FJM-300 type).

Q3: Why is coal leakage severe? How to reduce coal leakage?
A3:  reason:
1. Excessive grate clearance: After wear, the clearance is greater than 8mm (standard 3-5mm).
2. Coal particles are too fine:< The proportion of 6mm pulverized coal is too high.
3. Excessive wind pressure: If the wind pressure exceeds 1500Pa, the coal particles will be blown off.
solve:
Replace worn grate plates and install a coal leakage recovery device (such as an L-shaped scraper).
Control the particle size of coal (6-25mm accounting for ≥ 70%).
Adjust the primary air pressure to 800~1200Pa and increase the proportion of secondary air.

Q4: What should be done if uneven air distribution in the air chamber leads to insufficient combustion?
A4:  reason:
1. The partition plate of the wind chamber is deformed (such as FQP-4D type), and the air volume distribution is uneven.
2. Blockage of air vents: Ash accumulation affects ventilation.
3. Control valve malfunction: The damper actuator is stuck.
solve:
Replace with high-temperature resistant partition plates (such as 310S stainless steel FQP-6S type).
Clean the dust accumulation in the air chamber daily and blow the air holes with compressed air.
Use pneumatic control valves (such as CPV-10 type) to improve control accuracy.

Q5: How to deal with the rapid burning of slag blocker (eagle iron)?
A5:  reason:
1. Material not resistant to high temperatures: Ordinary cast iron (HT200) is prone to melting and corrosion at temperatures greater than 900 ° C.
2. Improper installation angle: Insufficient ash retention time when<30 °.
solve:
Upgrade to a high alloy slag stopper (such as the DZ-50 type of Cr26Ni12, with a temperature resistance of 1100 ° C).
Adjust the tilt angle to 45 °~60 °,Ensure that the ash residue is fully burned off.

Contact our professional engineering team promptly when encountering any questions!